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Linux-2.6.12-rc2

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Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
This commit is contained in:
Linus Torvalds
2005-04-16 15:20:36 -07:00
commit 1da177e4c3
17291 changed files with 6718755 additions and 0 deletions
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17
arch/arm26/kernel/Makefile Normal file
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#
# Makefile for the linux kernel.
#
# Object file lists.
AFLAGS_head.o := -DTEXTADDR=$(TEXTADDR)
obj-y := compat.o dma.o entry.o irq.o process.o ptrace.o \
semaphore.o setup.o signal.o sys_arm.o time.o traps.o \
ecard.o dma.o ecard.o fiq.o time.o
extra-y := head.o init_task.o vmlinux.lds
obj-$(CONFIG_FIQ) += fiq.o
obj-$(CONFIG_MODULES) += armksyms.o

220
arch/arm26/kernel/armksyms.c Normal file
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/*
* linux/arch/arm26/kernel/armksyms.c
*
* Copyright (C) 2003 Ian Molton
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/config.h>
#include <linux/module.h>
#include <linux/user.h>
#include <linux/string.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/delay.h>
#include <linux/in6.h>
#include <linux/interrupt.h>
#include <linux/pm.h>
#include <linux/tty.h>
#include <linux/vt_kern.h>
#include <linux/smp_lock.h>
#include <linux/syscalls.h>
#include <asm/byteorder.h>
#include <asm/elf.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/processor.h>
#include <asm/semaphore.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/checksum.h>
#include <asm/mach-types.h>
extern void dump_thread(struct pt_regs *, struct user *);
extern int dump_fpu(struct pt_regs *, struct user_fp_struct *);
extern void inswb(unsigned int port, void *to, int len);
extern void outswb(unsigned int port, const void *to, int len);
extern void __bad_xchg(volatile void *ptr, int size);
/*
* libgcc functions - functions that are used internally by the
* compiler... (prototypes are not correct though, but that
* doesn't really matter since they're not versioned).
*/
extern void __ashldi3(void);
extern void __ashrdi3(void);
extern void __divsi3(void);
extern void __lshrdi3(void);
extern void __modsi3(void);
extern void __muldi3(void);
extern void __ucmpdi2(void);
extern void __udivdi3(void);
extern void __umoddi3(void);
extern void __udivmoddi4(void);
extern void __udivsi3(void);
extern void __umodsi3(void);
extern void abort(void);
extern void ret_from_exception(void);
extern void fpundefinstr(void);
extern void fp_enter(void);
/*
* This has a special calling convention; it doesn't
* modify any of the usual registers, except for LR.
* FIXME - we used to use our own local version - looks to be in kernel/softirq now
*/
//extern void __do_softirq(void);
#define EXPORT_SYMBOL_ALIAS(sym,orig) \
const char __kstrtab_##sym[] \
__attribute__((section(".kstrtab"))) = \
__MODULE_STRING(sym); \
const struct module_symbol __ksymtab_##sym \
__attribute__((section("__ksymtab"))) = \
{ (unsigned long)&orig, __kstrtab_##sym };
/*
* floating point math emulator support.
* These symbols will never change their calling convention...
*/
EXPORT_SYMBOL_ALIAS(kern_fp_enter,fp_enter);
EXPORT_SYMBOL_ALIAS(fp_printk,printk);
EXPORT_SYMBOL_ALIAS(fp_send_sig,send_sig);
EXPORT_SYMBOL(fpundefinstr);
EXPORT_SYMBOL(ret_from_exception);
#ifdef CONFIG_VT
EXPORT_SYMBOL(kd_mksound);
#endif
//EXPORT_SYMBOL(__do_softirq);
/* platform dependent support */
EXPORT_SYMBOL(dump_thread);
EXPORT_SYMBOL(dump_fpu);
EXPORT_SYMBOL(udelay);
EXPORT_SYMBOL(kernel_thread);
EXPORT_SYMBOL(system_rev);
EXPORT_SYMBOL(system_serial_low);
EXPORT_SYMBOL(system_serial_high);
#ifdef CONFIG_DEBUG_BUGVERBOSE
EXPORT_SYMBOL(__bug);
#endif
EXPORT_SYMBOL(__bad_xchg);
EXPORT_SYMBOL(__readwrite_bug);
EXPORT_SYMBOL(enable_irq);
EXPORT_SYMBOL(disable_irq);
EXPORT_SYMBOL(set_irq_type);
EXPORT_SYMBOL(pm_idle);
EXPORT_SYMBOL(pm_power_off);
/* processor dependencies */
EXPORT_SYMBOL(__machine_arch_type);
/* networking */
EXPORT_SYMBOL(csum_partial_copy_nocheck);
EXPORT_SYMBOL(__csum_ipv6_magic);
/* io */
#ifndef __raw_readsb
EXPORT_SYMBOL(__raw_readsb);
#endif
#ifndef __raw_readsw
EXPORT_SYMBOL(__raw_readsw);
#endif
#ifndef __raw_readsl
EXPORT_SYMBOL(__raw_readsl);
#endif
#ifndef __raw_writesb
EXPORT_SYMBOL(__raw_writesb);
#endif
#ifndef __raw_writesw
EXPORT_SYMBOL(__raw_writesw);
#endif
#ifndef __raw_writesl
EXPORT_SYMBOL(__raw_writesl);
#endif
/* string / mem functions */
EXPORT_SYMBOL(strcpy);
EXPORT_SYMBOL(strncpy);
EXPORT_SYMBOL(strcat);
EXPORT_SYMBOL(strncat);
EXPORT_SYMBOL(strcmp);
EXPORT_SYMBOL(strncmp);
EXPORT_SYMBOL(strchr);
EXPORT_SYMBOL(strlen);
EXPORT_SYMBOL(strnlen);
EXPORT_SYMBOL(strpbrk);
EXPORT_SYMBOL(strrchr);
EXPORT_SYMBOL(strstr);
EXPORT_SYMBOL(memset);
EXPORT_SYMBOL(memcpy);
EXPORT_SYMBOL(memmove);
EXPORT_SYMBOL(memcmp);
EXPORT_SYMBOL(memscan);
EXPORT_SYMBOL(__memzero);
/* user mem (segment) */
EXPORT_SYMBOL(uaccess_kernel);
EXPORT_SYMBOL(uaccess_user);
EXPORT_SYMBOL(__get_user_1);
EXPORT_SYMBOL(__get_user_2);
EXPORT_SYMBOL(__get_user_4);
EXPORT_SYMBOL(__get_user_8);
EXPORT_SYMBOL(__put_user_1);
EXPORT_SYMBOL(__put_user_2);
EXPORT_SYMBOL(__put_user_4);
EXPORT_SYMBOL(__put_user_8);
/* gcc lib functions */
EXPORT_SYMBOL(__ashldi3);
EXPORT_SYMBOL(__ashrdi3);
EXPORT_SYMBOL(__divsi3);
EXPORT_SYMBOL(__lshrdi3);
EXPORT_SYMBOL(__modsi3);
EXPORT_SYMBOL(__muldi3);
EXPORT_SYMBOL(__ucmpdi2);
EXPORT_SYMBOL(__udivdi3);
EXPORT_SYMBOL(__umoddi3);
EXPORT_SYMBOL(__udivmoddi4);
EXPORT_SYMBOL(__udivsi3);
EXPORT_SYMBOL(__umodsi3);
/* bitops */
EXPORT_SYMBOL(_set_bit_le);
EXPORT_SYMBOL(_test_and_set_bit_le);
EXPORT_SYMBOL(_clear_bit_le);
EXPORT_SYMBOL(_test_and_clear_bit_le);
EXPORT_SYMBOL(_change_bit_le);
EXPORT_SYMBOL(_test_and_change_bit_le);
EXPORT_SYMBOL(_find_first_zero_bit_le);
EXPORT_SYMBOL(_find_next_zero_bit_le);
/* elf */
EXPORT_SYMBOL(elf_platform);
EXPORT_SYMBOL(elf_hwcap);
/* syscalls */
EXPORT_SYMBOL(sys_write);
EXPORT_SYMBOL(sys_read);
EXPORT_SYMBOL(sys_lseek);
EXPORT_SYMBOL(sys_open);
EXPORT_SYMBOL(sys_exit);
EXPORT_SYMBOL(sys_wait4);
EXPORT_SYMBOL(get_wchan);
#ifdef CONFIG_PREEMPT
EXPORT_SYMBOL(kernel_flag);
#endif

63
arch/arm26/kernel/asm-offsets.c Normal file
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/*
* Copyright (C) 1995-2001 Russell King
* 2001-2002 Keith Owens
* 2003 Ian Molton
*
* Generate definitions needed by assembly language modules.
* This code generates raw asm output which is post-processed to extract
* and format the required data.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/config.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <asm/pgtable.h>
#include <asm/uaccess.h>
/*
* Make sure that the compiler and target are compatible.
*/
#if defined(__APCS_32__) && defined(CONFIG_CPU_26)
#error Sorry, your compiler targets APCS-32 but this kernel requires APCS-26
#endif
#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 95)
#error Sorry, your compiler is known to miscompile kernels. Only use gcc 2.95.3 and later.
#endif
#if __GNUC__ == 2 && __GNUC_MINOR__ == 95
/* shame we can't detect the .1 or .2 releases */
#warning GCC 2.95.2 and earlier miscompiles kernels.
#endif
/* Use marker if you need to separate the values later */
#define DEFINE(sym, val) \
asm volatile("\n->" #sym " %0 " #val : : "i" (val))
#define BLANK() asm volatile("\n->" : : )
int main(void)
{
DEFINE(TSK_ACTIVE_MM, offsetof(struct task_struct, active_mm));
BLANK();
DEFINE(VMA_VM_MM, offsetof(struct vm_area_struct, vm_mm));
DEFINE(VMA_VM_FLAGS, offsetof(struct vm_area_struct, vm_flags));
BLANK();
DEFINE(VM_EXEC, VM_EXEC);
BLANK();
BLANK();
DEFINE(PAGE_PRESENT, _PAGE_PRESENT);
DEFINE(PAGE_READONLY, _PAGE_READONLY);
DEFINE(PAGE_NOT_USER, _PAGE_NOT_USER);
DEFINE(PAGE_OLD, _PAGE_OLD);
DEFINE(PAGE_CLEAN, _PAGE_CLEAN);
BLANK();
DEFINE(PAGE_SZ, PAGE_SIZE);
BLANK();
DEFINE(SYS_ERROR0, 0x9f0000);
return 0;
}

265
arch/arm26/kernel/calls.S Normal file
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/*
* linux/arch/arm26/kernel/calls.S
*
* Copyright (C) 2003 Ian Molton
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* FIXME
* This file is included twice in entry.S which may not be necessary
*/
//FIXME - clearly NR_syscalls is never defined here
#ifndef NR_syscalls
#define NR_syscalls 256
#else
__syscall_start:
/* 0 */ .long sys_ni_syscall
.long sys_exit
.long sys_fork_wrapper
.long sys_read
.long sys_write
/* 5 */ .long sys_open
.long sys_close
.long sys_ni_syscall /* was sys_waitpid */
.long sys_creat
.long sys_link
/* 10 */ .long sys_unlink
.long sys_execve_wrapper
.long sys_chdir
.long sys_time /* used by libc4 */
.long sys_mknod
/* 15 */ .long sys_chmod
.long sys_lchown16
.long sys_ni_syscall /* was sys_break */
.long sys_ni_syscall /* was sys_stat */
.long sys_lseek
/* 20 */ .long sys_getpid
.long sys_mount
.long sys_oldumount /* used by libc4 */
.long sys_setuid16
.long sys_getuid16
/* 25 */ .long sys_stime
.long sys_ptrace
.long sys_alarm /* used by libc4 */
.long sys_ni_syscall /* was sys_fstat */
.long sys_pause
/* 30 */ .long sys_utime /* used by libc4 */
.long sys_ni_syscall /* was sys_stty */
.long sys_ni_syscall /* was sys_getty */
.long sys_access
.long sys_nice
/* 35 */ .long sys_ni_syscall /* was sys_ftime */
.long sys_sync
.long sys_kill
.long sys_rename
.long sys_mkdir
/* 40 */ .long sys_rmdir
.long sys_dup
.long sys_pipe
.long sys_times
.long sys_ni_syscall /* was sys_prof */
/* 45 */ .long sys_brk
.long sys_setgid16
.long sys_getgid16
.long sys_ni_syscall /* was sys_signal */
.long sys_geteuid16
/* 50 */ .long sys_getegid16
.long sys_acct
.long sys_umount
.long sys_ni_syscall /* was sys_lock */
.long sys_ioctl
/* 55 */ .long sys_fcntl
.long sys_ni_syscall /* was sys_mpx */
.long sys_setpgid
.long sys_ni_syscall /* was sys_ulimit */
.long sys_ni_syscall /* was sys_olduname */
/* 60 */ .long sys_umask
.long sys_chroot
.long sys_ustat
.long sys_dup2
.long sys_getppid
/* 65 */ .long sys_getpgrp
.long sys_setsid
.long sys_sigaction
.long sys_ni_syscall /* was sys_sgetmask */
.long sys_ni_syscall /* was sys_ssetmask */
/* 70 */ .long sys_setreuid16
.long sys_setregid16
.long sys_sigsuspend_wrapper
.long sys_sigpending
.long sys_sethostname
/* 75 */ .long sys_setrlimit
.long sys_old_getrlimit /* used by libc4 */
.long sys_getrusage
.long sys_gettimeofday
.long sys_settimeofday
/* 80 */ .long sys_getgroups16
.long sys_setgroups16
.long old_select /* used by libc4 */
.long sys_symlink
.long sys_ni_syscall /* was sys_lstat */
/* 85 */ .long sys_readlink
.long sys_uselib
.long sys_swapon
.long sys_reboot
.long old_readdir /* used by libc4 */
/* 90 */ .long old_mmap /* used by libc4 */
.long sys_munmap
.long sys_truncate
.long sys_ftruncate
.long sys_fchmod
/* 95 */ .long sys_fchown16
.long sys_getpriority
.long sys_setpriority
.long sys_ni_syscall /* was sys_profil */
.long sys_statfs
/* 100 */ .long sys_fstatfs
.long sys_ni_syscall
.long sys_socketcall
.long sys_syslog
.long sys_setitimer
/* 105 */ .long sys_getitimer
.long sys_newstat
.long sys_newlstat
.long sys_newfstat
.long sys_ni_syscall /* was sys_uname */
/* 110 */ .long sys_ni_syscall /* was sys_iopl */
.long sys_vhangup
.long sys_ni_syscall
.long sys_syscall /* call a syscall */
.long sys_wait4
/* 115 */ .long sys_swapoff
.long sys_sysinfo
.long sys_ipc
.long sys_fsync
.long sys_sigreturn_wrapper
/* 120 */ .long sys_clone_wapper
.long sys_setdomainname
.long sys_newuname
.long sys_ni_syscall
.long sys_adjtimex
/* 125 */ .long sys_mprotect
.long sys_sigprocmask
.long sys_ni_syscall /* WAS: sys_create_module */
.long sys_init_module
.long sys_delete_module
/* 130 */ .long sys_ni_syscall /* WAS: sys_get_kernel_syms */
.long sys_quotactl
.long sys_getpgid
.long sys_fchdir
.long sys_bdflush
/* 135 */ .long sys_sysfs
.long sys_personality
.long sys_ni_syscall /* .long _sys_afs_syscall */
.long sys_setfsuid16
.long sys_setfsgid16
/* 140 */ .long sys_llseek
.long sys_getdents
.long sys_select
.long sys_flock
.long sys_msync
/* 145 */ .long sys_readv
.long sys_writev
.long sys_getsid
.long sys_fdatasync
.long sys_sysctl
/* 150 */ .long sys_mlock
.long sys_munlock
.long sys_mlockall
.long sys_munlockall
.long sys_sched_setparam
/* 155 */ .long sys_sched_getparam
.long sys_sched_setscheduler
.long sys_sched_getscheduler
.long sys_sched_yield
.long sys_sched_get_priority_max
/* 160 */ .long sys_sched_get_priority_min
.long sys_sched_rr_get_interval
.long sys_nanosleep
.long sys_arm_mremap
.long sys_setresuid16
/* 165 */ .long sys_getresuid16
.long sys_ni_syscall
.long sys_ni_syscall /* WAS: sys_query_module */
.long sys_poll
.long sys_nfsservctl
/* 170 */ .long sys_setresgid16
.long sys_getresgid16
.long sys_prctl
.long sys_rt_sigreturn_wrapper
.long sys_rt_sigaction
/* 175 */ .long sys_rt_sigprocmask
.long sys_rt_sigpending
.long sys_rt_sigtimedwait
.long sys_rt_sigqueueinfo
.long sys_rt_sigsuspend_wrapper
/* 180 */ .long sys_pread64
.long sys_pwrite64
.long sys_chown16
.long sys_getcwd
.long sys_capget
/* 185 */ .long sys_capset
.long sys_sigaltstack_wrapper
.long sys_sendfile
.long sys_ni_syscall
.long sys_ni_syscall
/* 190 */ .long sys_vfork_wrapper
.long sys_getrlimit
.long sys_mmap2
.long sys_truncate64
.long sys_ftruncate64
/* 195 */ .long sys_stat64
.long sys_lstat64
.long sys_fstat64
.long sys_lchown
.long sys_getuid
/* 200 */ .long sys_getgid
.long sys_geteuid
.long sys_getegid
.long sys_setreuid
.long sys_setregid
/* 205 */ .long sys_getgroups
.long sys_setgroups
.long sys_fchown
.long sys_setresuid
.long sys_getresuid
/* 210 */ .long sys_setresgid
.long sys_getresgid
.long sys_chown
.long sys_setuid
.long sys_setgid
/* 215 */ .long sys_setfsuid
.long sys_setfsgid
.long sys_getdents64
.long sys_pivot_root
.long sys_mincore
/* 220 */ .long sys_madvise
.long sys_fcntl64
.long sys_ni_syscall /* TUX */
.long sys_ni_syscall /* WAS: sys_security */
.long sys_gettid
/* 225 */ .long sys_readahead
.long sys_setxattr
.long sys_lsetxattr
.long sys_fsetxattr
.long sys_getxattr
/* 230 */ .long sys_lgetxattr
.long sys_fgetxattr
.long sys_listxattr
.long sys_llistxattr
.long sys_flistxattr
/* 235 */ .long sys_removexattr
.long sys_lremovexattr
.long sys_fremovexattr
.long sys_tkill
__syscall_end:
.rept NR_syscalls - (__syscall_end - __syscall_start) / 4
.long sys_ni_syscall
.endr
#endif

174
arch/arm26/kernel/compat.c Normal file
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/*
* linux/arch/arm26/kernel/compat.c
*
* Copyright (C) 2001 Russell King
* 2003 Ian Molton
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* We keep the old params compatibility cruft in one place (here)
* so we don't end up with lots of mess around other places.
*
* NOTE:
* The old struct param_struct is deprecated, but it will be kept in
* the kernel for 5 years from now (2001). This will allow boot loaders
* to convert to the new struct tag way.
*/
#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/init.h>
#include <asm/setup.h>
#include <asm/mach-types.h>
#include <asm/page.h>
//#include <asm/arch.h>
//#include <asm/mach/irq.h>
/*
* Usage:
* - do not go blindly adding fields, add them at the end
* - when adding fields, don't rely on the address until
* a patch from me has been released
* - unused fields should be zero (for future expansion)
* - this structure is relatively short-lived - only
* guaranteed to contain useful data in setup_arch()
*
* This is the old deprecated way to pass parameters to the kernel
*/
struct param_struct {
union {
struct {
unsigned long page_size; /* 0 */
unsigned long nr_pages; /* 4 */
unsigned long ramdisk_size; /* 8 */
unsigned long flags; /* 12 */
#define FLAG_READONLY 1
#define FLAG_RDLOAD 4
#define FLAG_RDPROMPT 8
unsigned long rootdev; /* 16 */
unsigned long video_num_cols; /* 20 */
unsigned long video_num_rows; /* 24 */
unsigned long video_x; /* 28 */
unsigned long video_y; /* 32 */
unsigned long memc_control_reg; /* 36 */
unsigned char sounddefault; /* 40 */
unsigned char adfsdrives; /* 41 */
unsigned char bytes_per_char_h; /* 42 */
unsigned char bytes_per_char_v; /* 43 */
unsigned long pages_in_bank[4]; /* 44 */
unsigned long pages_in_vram; /* 60 */
unsigned long initrd_start; /* 64 */
unsigned long initrd_size; /* 68 */
unsigned long rd_start; /* 72 */
unsigned long system_rev; /* 76 */
unsigned long system_serial_low; /* 80 */
unsigned long system_serial_high; /* 84 */
unsigned long mem_fclk_21285; /* 88 */
} s;
char unused[256];
} u1;
union {
char paths[8][128];
struct {
unsigned long magic;
char n[1024 - sizeof(unsigned long)];
} s;
} u2;
char commandline[COMMAND_LINE_SIZE];
};
static struct tag * __init memtag(struct tag *tag, unsigned long start, unsigned long size)
{
tag = tag_next(tag);
tag->hdr.tag = ATAG_MEM;
tag->hdr.size = tag_size(tag_mem32);
tag->u.mem.size = size;
tag->u.mem.start = start;
return tag;
}
static void __init build_tag_list(struct param_struct *params, void *taglist)
{
struct tag *tag = taglist;
if (params->u1.s.page_size != PAGE_SIZE) {
printk(KERN_WARNING "Warning: bad configuration page, "
"trying to continue\n");
return;
}
printk(KERN_DEBUG "Converting old-style param struct to taglist\n");
tag->hdr.tag = ATAG_CORE;
tag->hdr.size = tag_size(tag_core);
tag->u.core.flags = params->u1.s.flags & FLAG_READONLY;
tag->u.core.pagesize = params->u1.s.page_size;
tag->u.core.rootdev = params->u1.s.rootdev;
tag = tag_next(tag);
tag->hdr.tag = ATAG_RAMDISK;
tag->hdr.size = tag_size(tag_ramdisk);
tag->u.ramdisk.flags = (params->u1.s.flags & FLAG_RDLOAD ? 1 : 0) |
(params->u1.s.flags & FLAG_RDPROMPT ? 2 : 0);
tag->u.ramdisk.size = params->u1.s.ramdisk_size;
tag->u.ramdisk.start = params->u1.s.rd_start;
tag = tag_next(tag);
tag->hdr.tag = ATAG_INITRD;
tag->hdr.size = tag_size(tag_initrd);
tag->u.initrd.start = params->u1.s.initrd_start;
tag->u.initrd.size = params->u1.s.initrd_size;
tag = tag_next(tag);
tag->hdr.tag = ATAG_SERIAL;
tag->hdr.size = tag_size(tag_serialnr);
tag->u.serialnr.low = params->u1.s.system_serial_low;
tag->u.serialnr.high = params->u1.s.system_serial_high;
tag = tag_next(tag);
tag->hdr.tag = ATAG_REVISION;
tag->hdr.size = tag_size(tag_revision);
tag->u.revision.rev = params->u1.s.system_rev;
tag = memtag(tag, PHYS_OFFSET, params->u1.s.nr_pages * PAGE_SIZE);
tag = tag_next(tag);
tag->hdr.tag = ATAG_ACORN;
tag->hdr.size = tag_size(tag_acorn);
tag->u.acorn.memc_control_reg = params->u1.s.memc_control_reg;
tag->u.acorn.vram_pages = params->u1.s.pages_in_vram;
tag->u.acorn.sounddefault = params->u1.s.sounddefault;
tag->u.acorn.adfsdrives = params->u1.s.adfsdrives;
tag = tag_next(tag);
tag->hdr.tag = ATAG_CMDLINE;
tag->hdr.size = (strlen(params->commandline) + 3 +
sizeof(struct tag_header)) >> 2;
strcpy(tag->u.cmdline.cmdline, params->commandline);
tag = tag_next(tag);
tag->hdr.tag = ATAG_NONE;
tag->hdr.size = 0;
memmove(params, taglist, ((int)tag) - ((int)taglist) +
sizeof(struct tag_header));
}
void __init convert_to_tag_list(struct tag *tags)
{
struct param_struct *params = (struct param_struct *)tags;
build_tag_list(params, &params->u2);
}
void __init squash_mem_tags(struct tag *tag)
{
for (; tag->hdr.size; tag = tag_next(tag))
if (tag->hdr.tag == ATAG_MEM)
tag->hdr.tag = ATAG_NONE;
}

273
arch/arm26/kernel/dma.c Normal file
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/*
* linux/arch/arm26/kernel/dma.c
*
* Copyright (C) 1995-2000 Russell King
* 2003 Ian Molton
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Front-end to the DMA handling. This handles the allocation/freeing
* of DMA channels, and provides a unified interface to the machines
* DMA facilities.
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/mman.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/errno.h>
#include <asm/dma.h>
DEFINE_SPINLOCK(dma_spin_lock);
static dma_t dma_chan[MAX_DMA_CHANNELS];
/*
* Get dma list for /proc/dma
*/
int get_dma_list(char *buf)
{
dma_t *dma;
char *p = buf;
int i;
for (i = 0, dma = dma_chan; i < MAX_DMA_CHANNELS; i++, dma++)
if (dma->lock)
p += sprintf(p, "%2d: %14s %s\n", i,
dma->d_ops->type, dma->device_id);
return p - buf;
}
/*
* Request DMA channel
*
* On certain platforms, we have to allocate an interrupt as well...
*/
int request_dma(dmach_t channel, const char *device_id)
{
dma_t *dma = dma_chan + channel;
int ret;
if (channel >= MAX_DMA_CHANNELS || !dma->d_ops)
goto bad_dma;
if (xchg(&dma->lock, 1) != 0)
goto busy;
dma->device_id = device_id;
dma->active = 0;
dma->invalid = 1;
ret = 0;
if (dma->d_ops->request)
ret = dma->d_ops->request(channel, dma);
if (ret)
xchg(&dma->lock, 0);
return ret;
bad_dma:
printk(KERN_ERR "dma: trying to allocate DMA%d\n", channel);
return -EINVAL;
busy:
return -EBUSY;
}
/*
* Free DMA channel
*
* On certain platforms, we have to free interrupt as well...
*/
void free_dma(dmach_t channel)
{
dma_t *dma = dma_chan + channel;
if (channel >= MAX_DMA_CHANNELS || !dma->d_ops)
goto bad_dma;
if (dma->active) {
printk(KERN_ERR "dma%d: freeing active DMA\n", channel);
dma->d_ops->disable(channel, dma);
dma->active = 0;
}
if (xchg(&dma->lock, 0) != 0) {
if (dma->d_ops->free)
dma->d_ops->free(channel, dma);
return;
}
printk(KERN_ERR "dma%d: trying to free free DMA\n", channel);
return;
bad_dma:
printk(KERN_ERR "dma: trying to free DMA%d\n", channel);
}
/* Set DMA Scatter-Gather list
*/
void set_dma_sg (dmach_t channel, struct scatterlist *sg, int nr_sg)
{
dma_t *dma = dma_chan + channel;
if (dma->active)
printk(KERN_ERR "dma%d: altering DMA SG while "
"DMA active\n", channel);
dma->sg = sg;
dma->sgcount = nr_sg;
dma->using_sg = 1;
dma->invalid = 1;
}
/* Set DMA address
*
* Copy address to the structure, and set the invalid bit
*/
void set_dma_addr (dmach_t channel, unsigned long physaddr)
{
dma_t *dma = dma_chan + channel;
if (dma->active)
printk(KERN_ERR "dma%d: altering DMA address while "
"DMA active\n", channel);
dma->sg = &dma->buf;
dma->sgcount = 1;
dma->buf.__address = (char *)physaddr;//FIXME - not pretty
dma->using_sg = 0;
dma->invalid = 1;
}
/* Set DMA byte count
*
* Copy address to the structure, and set the invalid bit
*/
void set_dma_count (dmach_t channel, unsigned long count)
{
dma_t *dma = dma_chan + channel;
if (dma->active)
printk(KERN_ERR "dma%d: altering DMA count while "
"DMA active\n", channel);
dma->sg = &dma->buf;
dma->sgcount = 1;
dma->buf.length = count;
dma->using_sg = 0;
dma->invalid = 1;
}
/* Set DMA direction mode
*/
void set_dma_mode (dmach_t channel, dmamode_t mode)
{
dma_t *dma = dma_chan + channel;
if (dma->active)
printk(KERN_ERR "dma%d: altering DMA mode while "
"DMA active\n", channel);
dma->dma_mode = mode;
dma->invalid = 1;
}
/* Enable DMA channel
*/
void enable_dma (dmach_t channel)
{
dma_t *dma = dma_chan + channel;
if (!dma->lock)
goto free_dma;
if (dma->active == 0) {
dma->active = 1;
dma->d_ops->enable(channel, dma);
}
return;
free_dma:
printk(KERN_ERR "dma%d: trying to enable free DMA\n", channel);
BUG();
}
/* Disable DMA channel
*/
void disable_dma (dmach_t channel)
{
dma_t *dma = dma_chan + channel;
if (!dma->lock)
goto free_dma;
if (dma->active == 1) {
dma->active = 0;
dma->d_ops->disable(channel, dma);
}
return;
free_dma:
printk(KERN_ERR "dma%d: trying to disable free DMA\n", channel);
BUG();
}
/*
* Is the specified DMA channel active?
*/
int dma_channel_active(dmach_t channel)
{
return dma_chan[channel].active;
}
void set_dma_page(dmach_t channel, char pagenr)
{
printk(KERN_ERR "dma%d: trying to set_dma_page\n", channel);
}
void set_dma_speed(dmach_t channel, int cycle_ns)
{
dma_t *dma = dma_chan + channel;
int ret = 0;
if (dma->d_ops->setspeed)
ret = dma->d_ops->setspeed(channel, dma, cycle_ns);
dma->speed = ret;
}
int get_dma_residue(dmach_t channel)
{
dma_t *dma = dma_chan + channel;
int ret = 0;
if (dma->d_ops->residue)
ret = dma->d_ops->residue(channel, dma);
return ret;
}
void __init init_dma(void)
{
arch_dma_init(dma_chan);
}
EXPORT_SYMBOL(request_dma);
EXPORT_SYMBOL(free_dma);
EXPORT_SYMBOL(enable_dma);
EXPORT_SYMBOL(disable_dma);
EXPORT_SYMBOL(set_dma_addr);
EXPORT_SYMBOL(set_dma_count);
EXPORT_SYMBOL(set_dma_mode);
EXPORT_SYMBOL(set_dma_page);
EXPORT_SYMBOL(get_dma_residue);
EXPORT_SYMBOL(set_dma_sg);
EXPORT_SYMBOL(set_dma_speed);
EXPORT_SYMBOL(dma_spin_lock);

850
arch/arm26/kernel/ecard.c Normal file
View File

@@ -0,0 +1,850 @@
/*
* linux/arch/arm26/kernel/ecard.c
*
* Copyright 1995-2001 Russell King
* Copyright 2003 Ian Molton
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Find all installed expansion cards, and handle interrupts from them.
*
* Created from information from Acorns RiscOS3 PRMs
* 15-Jun-2003 IM Modified from ARM32 (RiscPC capable) version
* 10-Jan-1999 RMK Run loaders in a simulated RISC OS environment.
* 06-May-1997 RMK Added blacklist for cards whose loader doesn't work.
* 12-Sep-1997 RMK Created new handling of interrupt enables/disables
* - cards can now register their own routine to control
* interrupts (recommended).
* 29-Sep-1997 RMK Expansion card interrupt hardware not being re-enabled
* on reset from Linux. (Caused cards not to respond
* under RiscOS without hard reset).
*
*/
#define ECARD_C
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/reboot.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/proc_fs.h>
#include <linux/device.h>
#include <linux/init.h>
#include <asm/dma.h>
#include <asm/ecard.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/mmu_context.h>
#include <asm/irqchip.h>
#include <asm/tlbflush.h>
enum req {
req_readbytes,
req_reset
};
struct ecard_request {
enum req req;
ecard_t *ec;
unsigned int address;
unsigned int length;
unsigned int use_loader;
void *buffer;
};
struct expcard_blacklist {
unsigned short manufacturer;
unsigned short product;
const char *type;
};
static ecard_t *cards;
static ecard_t *slot_to_expcard[MAX_ECARDS];
static unsigned int ectcr;
/* List of descriptions of cards which don't have an extended
* identification, or chunk directories containing a description.
*/
static struct expcard_blacklist __initdata blacklist[] = {
{ MANU_ACORN, PROD_ACORN_ETHER1, "Acorn Ether1" }
};
asmlinkage extern int
ecard_loader_reset(volatile unsigned char *pa, loader_t loader);
asmlinkage extern int
ecard_loader_read(int off, volatile unsigned char *pa, loader_t loader);
static const struct ecard_id *
ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec);
static inline unsigned short
ecard_getu16(unsigned char *v)
{
return v[0] | v[1] << 8;
}
static inline signed long
ecard_gets24(unsigned char *v)
{
return v[0] | v[1] << 8 | v[2] << 16 | ((v[2] & 0x80) ? 0xff000000 : 0);
}
static inline ecard_t *
slot_to_ecard(unsigned int slot)
{
return slot < MAX_ECARDS ? slot_to_expcard[slot] : NULL;
}
/* ===================== Expansion card daemon ======================== */
/*
* Since the loader programs on the expansion cards need to be run
* in a specific environment, create a separate task with this
* environment up, and pass requests to this task as and when we
* need to.
*
* This should allow 99% of loaders to be called from Linux.
*
* From a security standpoint, we trust the card vendors. This
* may be a misplaced trust.
*/
#define BUS_ADDR(x) ((((unsigned long)(x)) << 2) + IO_BASE)
#define POD_INT_ADDR(x) ((volatile unsigned char *)\
((BUS_ADDR((x)) - IO_BASE) + IO_START))
static inline void ecard_task_reset(struct ecard_request *req)
{
struct expansion_card *ec = req->ec;
if (ec->loader)
ecard_loader_reset(POD_INT_ADDR(ec->podaddr), ec->loader);
}
static void
ecard_task_readbytes(struct ecard_request *req)
{
unsigned char *buf = (unsigned char *)req->buffer;
volatile unsigned char *base_addr =
(volatile unsigned char *)POD_INT_ADDR(req->ec->podaddr);
unsigned int len = req->length;
unsigned int off = req->address;
if (!req->use_loader || !req->ec->loader) {
off *= 4;
while (len--) {
*buf++ = base_addr[off];
off += 4;
}
} else {
while(len--) {
/*
* The following is required by some
* expansion card loader programs.
*/
*(unsigned long *)0x108 = 0;
*buf++ = ecard_loader_read(off++, base_addr,
req->ec->loader);
}
}
}
static void ecard_do_request(struct ecard_request *req)
{
switch (req->req) {
case req_readbytes:
ecard_task_readbytes(req);
break;
case req_reset:
ecard_task_reset(req);
break;
}
}
/*
* On 26-bit processors, we don't need the kcardd thread to access the
* expansion card loaders. We do it directly.
*/
#define ecard_call(req) ecard_do_request(req)
/* ======================= Mid-level card control ===================== */
static void
ecard_readbytes(void *addr, ecard_t *ec, int off, int len, int useld)
{
struct ecard_request req;
req.req = req_readbytes;
req.ec = ec;
req.address = off;
req.length = len;
req.use_loader = useld;
req.buffer = addr;
ecard_call(&req);
}
int ecard_readchunk(struct in_chunk_dir *cd, ecard_t *ec, int id, int num)
{
struct ex_chunk_dir excd;
int index = 16;
int useld = 0;
if (!ec->cid.cd)
return 0;
while(1) {
ecard_readbytes(&excd, ec, index, 8, useld);
index += 8;
if (c_id(&excd) == 0) {
if (!useld && ec->loader) {
useld = 1;
index = 0;
continue;
}
return 0;
}
if (c_id(&excd) == 0xf0) { /* link */
index = c_start(&excd);
continue;
}
if (c_id(&excd) == 0x80) { /* loader */
if (!ec->loader) {
ec->loader = (loader_t)kmalloc(c_len(&excd),
GFP_KERNEL);
if (ec->loader)
ecard_readbytes(ec->loader, ec,
(int)c_start(&excd),
c_len(&excd), useld);
else
return 0;
}
continue;
}
if (c_id(&excd) == id && num-- == 0)
break;
}
if (c_id(&excd) & 0x80) {
switch (c_id(&excd) & 0x70) {
case 0x70:
ecard_readbytes((unsigned char *)excd.d.string, ec,
(int)c_start(&excd), c_len(&excd),
useld);
break;
case 0x00:
break;
}
}
cd->start_offset = c_start(&excd);
memcpy(cd->d.string, excd.d.string, 256);
return 1;
}
/* ======================= Interrupt control ============================ */
static void ecard_def_irq_enable(ecard_t *ec, int irqnr)
{
}
static void ecard_def_irq_disable(ecard_t *ec, int irqnr)
{
}
static int ecard_def_irq_pending(ecard_t *ec)
{
return !ec->irqmask || ec->irqaddr[0] & ec->irqmask;
}
static void ecard_def_fiq_enable(ecard_t *ec, int fiqnr)
{
panic("ecard_def_fiq_enable called - impossible");
}
static void ecard_def_fiq_disable(ecard_t *ec, int fiqnr)
{
panic("ecard_def_fiq_disable called - impossible");
}
static int ecard_def_fiq_pending(ecard_t *ec)
{
return !ec->fiqmask || ec->fiqaddr[0] & ec->fiqmask;
}
static expansioncard_ops_t ecard_default_ops = {
ecard_def_irq_enable,
ecard_def_irq_disable,
ecard_def_irq_pending,
ecard_def_fiq_enable,
ecard_def_fiq_disable,
ecard_def_fiq_pending
};
/*
* Enable and disable interrupts from expansion cards.
* (interrupts are disabled for these functions).
*
* They are not meant to be called directly, but via enable/disable_irq.
*/
static void ecard_irq_unmask(unsigned int irqnr)
{
ecard_t *ec = slot_to_ecard(irqnr - 32);
if (ec) {
if (!ec->ops)
ec->ops = &ecard_default_ops;
if (ec->claimed && ec->ops->irqenable)
ec->ops->irqenable(ec, irqnr);
else
printk(KERN_ERR "ecard: rejecting request to "
"enable IRQs for %d\n", irqnr);
}
}
static void ecard_irq_mask(unsigned int irqnr)
{
ecard_t *ec = slot_to_ecard(irqnr - 32);
if (ec) {
if (!ec->ops)
ec->ops = &ecard_default_ops;
if (ec->ops && ec->ops->irqdisable)
ec->ops->irqdisable(ec, irqnr);
}
}
static struct irqchip ecard_chip = {
.ack = ecard_irq_mask,
.mask = ecard_irq_mask,
.unmask = ecard_irq_unmask,
};
void ecard_enablefiq(unsigned int fiqnr)
{
ecard_t *ec = slot_to_ecard(fiqnr);
if (ec) {
if (!ec->ops)
ec->ops = &ecard_default_ops;
if (ec->claimed && ec->ops->fiqenable)
ec->ops->fiqenable(ec, fiqnr);
else
printk(KERN_ERR "ecard: rejecting request to "
"enable FIQs for %d\n", fiqnr);
}
}
void ecard_disablefiq(unsigned int fiqnr)
{
ecard_t *ec = slot_to_ecard(fiqnr);
if (ec) {
if (!ec->ops)
ec->ops = &ecard_default_ops;
if (ec->ops->fiqdisable)
ec->ops->fiqdisable(ec, fiqnr);
}
}
static void
ecard_dump_irq_state(ecard_t *ec)
{
printk(" %d: %sclaimed, ",
ec->slot_no,
ec->claimed ? "" : "not ");
if (ec->ops && ec->ops->irqpending &&
ec->ops != &ecard_default_ops)
printk("irq %spending\n",
ec->ops->irqpending(ec) ? "" : "not ");
else
printk("irqaddr %p, mask = %02X, status = %02X\n",
ec->irqaddr, ec->irqmask, *ec->irqaddr);
}
static void ecard_check_lockup(struct irqdesc *desc)
{
static int last, lockup;
ecard_t *ec;
/*
* If the timer interrupt has not run since the last million
* unrecognised expansion card interrupts, then there is
* something seriously wrong. Disable the expansion card
* interrupts so at least we can continue.
*
* Maybe we ought to start a timer to re-enable them some time
* later?
*/
if (last == jiffies) {
lockup += 1;
if (lockup > 1000000) {
printk(KERN_ERR "\nInterrupt lockup detected - "
"disabling all expansion card interrupts\n");
desc->chip->mask(IRQ_EXPANSIONCARD);
printk("Expansion card IRQ state:\n");
for (ec = cards; ec; ec = ec->next)
ecard_dump_irq_state(ec);
}
} else
lockup = 0;
/*
* If we did not recognise the source of this interrupt,
* warn the user, but don't flood the user with these messages.
*/
if (!last || time_after(jiffies, (unsigned long)(last + 5*HZ))) {
last = jiffies;
printk(KERN_WARNING "Unrecognised interrupt from backplane\n");
}
}
static void
ecard_irq_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
{
ecard_t *ec;
int called = 0;
desc->chip->mask(irq);
for (ec = cards; ec; ec = ec->next) {
int pending;
if (!ec->claimed || ec->irq == NO_IRQ)
continue;
if (ec->ops && ec->ops->irqpending)
pending = ec->ops->irqpending(ec);
else
pending = ecard_default_ops.irqpending(ec);
if (pending) {
struct irqdesc *d = irq_desc + ec->irq;
d->handle(ec->irq, d, regs);
called ++;
}
}
desc->chip->unmask(irq);
if (called == 0)
ecard_check_lockup(desc);
}
#define ecard_irqexp_handler NULL
#define ecard_probeirqhw() (0)
unsigned int ecard_address(ecard_t *ec, card_type_t type, card_speed_t speed)
{
unsigned long address = 0;
int slot = ec->slot_no;
ectcr &= ~(1 << slot);
switch (type) {
case ECARD_MEMC:
address = IO_EC_MEMC_BASE + (slot << 12);
break;
case ECARD_IOC:
address = IO_EC_IOC_BASE + (slot << 12) + (speed << 17);
break;
default:
break;
}
return address;
}
static int ecard_prints(char *buffer, ecard_t *ec)
{
char *start = buffer;
buffer += sprintf(buffer, " %d: ", ec->slot_no);
if (ec->cid.id == 0) {
struct in_chunk_dir incd;
buffer += sprintf(buffer, "[%04X:%04X] ",
ec->cid.manufacturer, ec->cid.product);
if (!ec->card_desc && ec->cid.cd &&
ecard_readchunk(&incd, ec, 0xf5, 0)) {
ec->card_desc = kmalloc(strlen(incd.d.string)+1, GFP_KERNEL);
if (ec->card_desc)
strcpy((char *)ec->card_desc, incd.d.string);
}
buffer += sprintf(buffer, "%s\n", ec->card_desc ? ec->card_desc : "*unknown*");
} else
buffer += sprintf(buffer, "Simple card %d\n", ec->cid.id);
return buffer - start;
}
static int get_ecard_dev_info(char *buf, char **start, off_t pos, int count)
{
ecard_t *ec = cards;
off_t at = 0;
int len, cnt;
cnt = 0;
while (ec && count > cnt) {
len = ecard_prints(buf, ec);
at += len;
if (at >= pos) {
if (!*start) {
*start = buf + (pos - (at - len));
cnt = at - pos;
} else
cnt += len;
buf += len;
}
ec = ec->next;
}
return (count > cnt) ? cnt : count;
}
static struct proc_dir_entry *proc_bus_ecard_dir = NULL;
static void ecard_proc_init(void)
{
proc_bus_ecard_dir = proc_mkdir("ecard", proc_bus);
create_proc_info_entry("devices", 0, proc_bus_ecard_dir,
get_ecard_dev_info);
}
#define ec_set_resource(ec,nr,st,sz,flg) \
do { \
(ec)->resource[nr].name = ec->dev.bus_id; \
(ec)->resource[nr].start = st; \
(ec)->resource[nr].end = (st) + (sz) - 1; \
(ec)->resource[nr].flags = flg; \
} while (0)
static void __init ecard_init_resources(struct expansion_card *ec)
{
unsigned long base = PODSLOT_IOC0_BASE;
unsigned int slot = ec->slot_no;
int i;
ec_set_resource(ec, ECARD_RES_MEMC,
PODSLOT_MEMC_BASE + (slot << 14),
PODSLOT_MEMC_SIZE, IORESOURCE_MEM);
for (i = 0; i < ECARD_RES_IOCSYNC - ECARD_RES_IOCSLOW; i++) {
ec_set_resource(ec, i + ECARD_RES_IOCSLOW,
base + (slot << 14) + (i << 19),
PODSLOT_IOC_SIZE, IORESOURCE_MEM);
}
for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
if (ec->resource[i].start &&
request_resource(&iomem_resource, &ec->resource[i])) {
printk(KERN_ERR "%s: resource(s) not available\n",
ec->dev.bus_id);
ec->resource[i].end -= ec->resource[i].start;
ec->resource[i].start = 0;
}
}
}
static ssize_t ecard_show_irq(struct device *dev, char *buf)
{
struct expansion_card *ec = ECARD_DEV(dev);
return sprintf(buf, "%u\n", ec->irq);
}
static ssize_t ecard_show_vendor(struct device *dev, char *buf)
{
struct expansion_card *ec = ECARD_DEV(dev);
return sprintf(buf, "%u\n", ec->cid.manufacturer);
}
static ssize_t ecard_show_device(struct device *dev, char *buf)
{
struct expansion_card *ec = ECARD_DEV(dev);
return sprintf(buf, "%u\n", ec->cid.product);
}
static ssize_t ecard_show_dma(struct device *dev, char *buf)
{
struct expansion_card *ec = ECARD_DEV(dev);
return sprintf(buf, "%u\n", ec->dma);
}
static ssize_t ecard_show_resources(struct device *dev, char *buf)
{
struct expansion_card *ec = ECARD_DEV(dev);
char *str = buf;
int i;
for (i = 0; i < ECARD_NUM_RESOURCES; i++)
str += sprintf(str, "%08lx %08lx %08lx\n",
ec->resource[i].start,
ec->resource[i].end,
ec->resource[i].flags);
return str - buf;
}
static DEVICE_ATTR(irq, S_IRUGO, ecard_show_irq, NULL);
static DEVICE_ATTR(vendor, S_IRUGO, ecard_show_vendor, NULL);
static DEVICE_ATTR(device, S_IRUGO, ecard_show_device, NULL);
static DEVICE_ATTR(dma, S_IRUGO, ecard_show_dma, NULL);
static DEVICE_ATTR(resource, S_IRUGO, ecard_show_resources, NULL);
/*
* Probe for an expansion card.
*
* If bit 1 of the first byte of the card is set, then the
* card does not exist.
*/
static int __init
ecard_probe(int slot, card_type_t type)
{
ecard_t **ecp;
ecard_t *ec;
struct ex_ecid cid;
int i, rc = -ENOMEM;
ec = kmalloc(sizeof(ecard_t), GFP_KERNEL);
if (!ec)
goto nomem;
memset(ec, 0, sizeof(ecard_t));
ec->slot_no = slot;
ec->type = type;
ec->irq = NO_IRQ;
ec->fiq = NO_IRQ;
ec->dma = NO_DMA;
ec->card_desc = NULL;
ec->ops = &ecard_default_ops;
rc = -ENODEV;
if ((ec->podaddr = ecard_address(ec, type, ECARD_SYNC)) == 0)
goto nodev;
cid.r_zero = 1;
ecard_readbytes(&cid, ec, 0, 16, 0);
if (cid.r_zero)
goto nodev;
ec->cid.id = cid.r_id;
ec->cid.cd = cid.r_cd;
ec->cid.is = cid.r_is;
ec->cid.w = cid.r_w;
ec->cid.manufacturer = ecard_getu16(cid.r_manu);
ec->cid.product = ecard_getu16(cid.r_prod);
ec->cid.country = cid.r_country;
ec->cid.irqmask = cid.r_irqmask;
ec->cid.irqoff = ecard_gets24(cid.r_irqoff);
ec->cid.fiqmask = cid.r_fiqmask;
ec->cid.fiqoff = ecard_gets24(cid.r_fiqoff);
ec->fiqaddr =
ec->irqaddr = (unsigned char *)ioaddr(ec->podaddr);
if (ec->cid.is) {
ec->irqmask = ec->cid.irqmask;
ec->irqaddr += ec->cid.irqoff;
ec->fiqmask = ec->cid.fiqmask;
ec->fiqaddr += ec->cid.fiqoff;
} else {
ec->irqmask = 1;
ec->fiqmask = 4;
}
for (i = 0; i < sizeof(blacklist) / sizeof(*blacklist); i++)
if (blacklist[i].manufacturer == ec->cid.manufacturer &&
blacklist[i].product == ec->cid.product) {
ec->card_desc = blacklist[i].type;
break;
}
snprintf(ec->dev.bus_id, sizeof(ec->dev.bus_id), "ecard%d", slot);
ec->dev.parent = NULL;
ec->dev.bus = &ecard_bus_type;
ec->dev.dma_mask = &ec->dma_mask;
ec->dma_mask = (u64)0xffffffff;
ecard_init_resources(ec);
/*
* hook the interrupt handlers
*/
ec->irq = 32 + slot;
set_irq_chip(ec->irq, &ecard_chip);
set_irq_handler(ec->irq, do_level_IRQ);
set_irq_flags(ec->irq, IRQF_VALID);
for (ecp = &cards; *ecp; ecp = &(*ecp)->next);
*ecp = ec;
slot_to_expcard[slot] = ec;
device_register(&ec->dev);
device_create_file(&ec->dev, &dev_attr_dma);
device_create_file(&ec->dev, &dev_attr_irq);
device_create_file(&ec->dev, &dev_attr_resource);
device_create_file(&ec->dev, &dev_attr_vendor);
device_create_file(&ec->dev, &dev_attr_device);
return 0;
nodev:
kfree(ec);
nomem:
return rc;
}
/*
* Initialise the expansion card system.
* Locate all hardware - interrupt management and
* actual cards.
*/
static int __init ecard_init(void)
{
int slot, irqhw;
printk("Probing expansion cards\n");
for (slot = 0; slot < MAX_ECARDS; slot ++) {
ecard_probe(slot, ECARD_IOC);
}
irqhw = ecard_probeirqhw();
set_irq_chained_handler(IRQ_EXPANSIONCARD,
irqhw ? ecard_irqexp_handler : ecard_irq_handler);
ecard_proc_init();
return 0;
}
subsys_initcall(ecard_init);
/*
* ECARD "bus"
*/
static const struct ecard_id *
ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec)
{
int i;
for (i = 0; ids[i].manufacturer != 65535; i++)
if (ec->cid.manufacturer == ids[i].manufacturer &&
ec->cid.product == ids[i].product)
return ids + i;
return NULL;
}
static int ecard_drv_probe(struct device *dev)
{
struct expansion_card *ec = ECARD_DEV(dev);
struct ecard_driver *drv = ECARD_DRV(dev->driver);
const struct ecard_id *id;
int ret;
id = ecard_match_device(drv->id_table, ec);
ecard_claim(ec);
ret = drv->probe(ec, id);
if (ret)
ecard_release(ec);
return ret;
}
static int ecard_drv_remove(struct device *dev)
{
struct expansion_card *ec = ECARD_DEV(dev);
struct ecard_driver *drv = ECARD_DRV(dev->driver);
drv->remove(ec);
ecard_release(ec);
return 0;
}
/*
* Before rebooting, we must make sure that the expansion card is in a
* sensible state, so it can be re-detected. This means that the first
* page of the ROM must be visible. We call the expansion cards reset
* handler, if any.
*/
static void ecard_drv_shutdown(struct device *dev)
{
struct expansion_card *ec = ECARD_DEV(dev);
struct ecard_driver *drv = ECARD_DRV(dev->driver);
struct ecard_request req;
if (drv->shutdown)
drv->shutdown(ec);
ecard_release(ec);
req.req = req_reset;
req.ec = ec;
ecard_call(&req);
}
int ecard_register_driver(struct ecard_driver *drv)
{
drv->drv.bus = &ecard_bus_type;
drv->drv.probe = ecard_drv_probe;
drv->drv.remove = ecard_drv_remove;
drv->drv.shutdown = ecard_drv_shutdown;
return driver_register(&drv->drv);
}
void ecard_remove_driver(struct ecard_driver *drv)
{
driver_unregister(&drv->drv);
}
static int ecard_match(struct device *_dev, struct device_driver *_drv)
{
struct expansion_card *ec = ECARD_DEV(_dev);
struct ecard_driver *drv = ECARD_DRV(_drv);
int ret;
if (drv->id_table) {
ret = ecard_match_device(drv->id_table, ec) != NULL;
} else {
ret = ec->cid.id == drv->id;
}
return ret;
}
struct bus_type ecard_bus_type = {
.name = "ecard",
.match = ecard_match,
};
static int ecard_bus_init(void)
{
return bus_register(&ecard_bus_type);
}
postcore_initcall(ecard_bus_init);
EXPORT_SYMBOL(ecard_readchunk);
EXPORT_SYMBOL(ecard_address);
EXPORT_SYMBOL(ecard_register_driver);
EXPORT_SYMBOL(ecard_remove_driver);
EXPORT_SYMBOL(ecard_bus_type);

961
arch/arm26/kernel/entry.S Normal file
View File

@@ -0,0 +1,961 @@
/* arch/arm26/kernel/entry.S
*
* Assembled from chunks of code in arch/arm
*
* Copyright (C) 2003 Ian Molton
* Based on the work of RMK.
*
*/
#include <linux/linkage.h>
#include <asm/assembler.h>
#include <asm/asm_offsets.h>
#include <asm/errno.h>
#include <asm/hardware.h>
#include <asm/sysirq.h>
#include <asm/thread_info.h>
#include <asm/page.h>
#include <asm/ptrace.h>
.macro zero_fp
#ifndef CONFIG_NO_FRAME_POINTER
mov fp, #0
#endif
.endm
.text
@ Bad Abort numbers
@ -----------------
@
#define BAD_PREFETCH 0
#define BAD_DATA 1
#define BAD_ADDREXCPTN 2
#define BAD_IRQ 3
#define BAD_UNDEFINSTR 4
@ OS version number used in SWIs
@ RISC OS is 0
@ RISC iX is 8
@
#define OS_NUMBER 9
#define ARMSWI_OFFSET 0x000f0000
@
@ Stack format (ensured by USER_* and SVC_*)
@ PSR and PC are comined on arm26
@
#define S_OFF 8
#define S_OLD_R0 64
#define S_PC 60
#define S_LR 56
#define S_SP 52
#define S_IP 48
#define S_FP 44
#define S_R10 40
#define S_R9 36
#define S_R8 32
#define S_R7 28
#define S_R6 24
#define S_R5 20
#define S_R4 16
#define S_R3 12
#define S_R2 8
#define S_R1 4
#define S_R0 0
.macro save_user_regs
str r0, [sp, #-4]! @ Store SVC r0
str lr, [sp, #-4]! @ Store user mode PC
sub sp, sp, #15*4
stmia sp, {r0 - lr}^ @ Store the other user-mode regs
mov r0, r0
.endm
.macro slow_restore_user_regs
ldmia sp, {r0 - lr}^ @ restore the user regs not including PC
mov r0, r0
ldr lr, [sp, #15*4] @ get user PC
add sp, sp, #15*4+8 @ free stack
movs pc, lr @ return
.endm
.macro fast_restore_user_regs
add sp, sp, #S_OFF
ldmib sp, {r1 - lr}^
mov r0, r0
ldr lr, [sp, #15*4]
add sp, sp, #15*4+8
movs pc, lr
.endm
.macro save_svc_regs
str sp, [sp, #-16]!
str lr, [sp, #8]
str lr, [sp, #4]
stmfd sp!, {r0 - r12}
mov r0, #-1
str r0, [sp, #S_OLD_R0]
zero_fp
.endm
.macro save_svc_regs_irq
str sp, [sp, #-16]!
str lr, [sp, #4]
ldr lr, .LCirq
ldr lr, [lr]
str lr, [sp, #8]
stmfd sp!, {r0 - r12}
mov r0, #-1
str r0, [sp, #S_OLD_R0]
zero_fp
.endm
.macro restore_svc_regs
ldmfd sp, {r0 - pc}^
.endm
.macro mask_pc, rd, rm
bic \rd, \rm, #PCMASK
.endm
.macro disable_irqs, temp
mov \temp, pc
orr \temp, \temp, #PSR_I_BIT
teqp \temp, #0
.endm
.macro enable_irqs, temp
mov \temp, pc
and \temp, \temp, #~PSR_I_BIT
teqp \temp, #0
.endm
.macro initialise_traps_extra
.endm
.macro get_thread_info, rd
mov \rd, sp, lsr #13
mov \rd, \rd, lsl #13
.endm
/*
* These are the registers used in the syscall handler, and allow us to
* have in theory up to 7 arguments to a function - r0 to r6.
*
* Note that tbl == why is intentional.
*
* We must set at least "tsk" and "why" when calling ret_with_reschedule.
*/
scno .req r7 @ syscall number
tbl .req r8 @ syscall table pointer
why .req r8 @ Linux syscall (!= 0)
tsk .req r9 @ current thread_info
/*
* Get the system call number.
*/
.macro get_scno
mask_pc lr, lr
ldr scno, [lr, #-4] @ get SWI instruction
.endm
/*
* -----------------------------------------------------------------------
*/
/*
* We rely on the fact that R0 is at the bottom of the stack (due to
* slow/fast restore user regs).
*/
#if S_R0 != 0
#error "Please fix"
#endif
/*
* This is the fast syscall return path. We do as little as
* possible here, and this includes saving r0 back into the SVC
* stack.
*/
ret_fast_syscall:
disable_irqs r1 @ disable interrupts
ldr r1, [tsk, #TI_FLAGS]
tst r1, #_TIF_WORK_MASK
bne fast_work_pending
fast_restore_user_regs
/*
* Ok, we need to do extra processing, enter the slow path.
*/
fast_work_pending:
str r0, [sp, #S_R0+S_OFF]! @ returned r0
work_pending:
tst r1, #_TIF_NEED_RESCHED
bne work_resched
tst r1, #_TIF_NOTIFY_RESUME | _TIF_SIGPENDING
beq no_work_pending
mov r0, sp @ 'regs'
mov r2, why @ 'syscall'
bl do_notify_resume
disable_irqs r1 @ disable interrupts
b no_work_pending
work_resched:
bl schedule
/*
* "slow" syscall return path. "why" tells us if this was a real syscall.
*/
ENTRY(ret_to_user)
ret_slow_syscall:
disable_irqs r1 @ disable interrupts
ldr r1, [tsk, #TI_FLAGS]
tst r1, #_TIF_WORK_MASK
bne work_pending
no_work_pending:
slow_restore_user_regs
/*
* This is how we return from a fork.
*/
ENTRY(ret_from_fork)
bl schedule_tail
get_thread_info tsk
ldr r1, [tsk, #TI_FLAGS] @ check for syscall tracing
mov why, #1
tst r1, #_TIF_SYSCALL_TRACE @ are we tracing syscalls?
beq ret_slow_syscall
mov r1, sp
mov r0, #1 @ trace exit [IP = 1]
bl syscall_trace
b ret_slow_syscall
// FIXME - is this strictly necessary?
#include "calls.S"
/*=============================================================================
* SWI handler
*-----------------------------------------------------------------------------
*/
.align 5
ENTRY(vector_swi)
save_user_regs
zero_fp
get_scno
#ifdef CONFIG_ALIGNMENT_TRAP
ldr ip, __cr_alignment
ldr ip, [ip]
mcr p15, 0, ip, c1, c0 @ update control register
#endif
enable_irqs ip
str r4, [sp, #-S_OFF]! @ push fifth arg
get_thread_info tsk
ldr ip, [tsk, #TI_FLAGS] @ check for syscall tracing
bic scno, scno, #0xff000000 @ mask off SWI op-code
eor scno, scno, #OS_NUMBER << 20 @ check OS number
adr tbl, sys_call_table @ load syscall table pointer
tst ip, #_TIF_SYSCALL_TRACE @ are we tracing syscalls?
bne __sys_trace
adral lr, ret_fast_syscall @ set return address
orral lr, lr, #PSR_I_BIT | MODE_SVC26 @ Force SVC mode on return
cmp scno, #NR_syscalls @ check upper syscall limit
ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine
add r1, sp, #S_OFF
2: mov why, #0 @ no longer a real syscall
cmp scno, #ARMSWI_OFFSET
eor r0, scno, #OS_NUMBER << 20 @ put OS number back
bcs arm_syscall
b sys_ni_syscall @ not private func
/*
* This is the really slow path. We're going to be doing
* context switches, and waiting for our parent to respond.
*/
__sys_trace:
add r1, sp, #S_OFF
mov r0, #0 @ trace entry [IP = 0]
bl syscall_trace
adral lr, __sys_trace_return @ set return address
orral lr, lr, #PSR_I_BIT | MODE_SVC26 @ Force SVC mode on return
add r1, sp, #S_R0 + S_OFF @ pointer to regs
cmp scno, #NR_syscalls @ check upper syscall limit
ldmccia r1, {r0 - r3} @ have to reload r0 - r3
ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine
b 2b
__sys_trace_return:
str r0, [sp, #S_R0 + S_OFF]! @ save returned r0
mov r1, sp
mov r0, #1 @ trace exit [IP = 1]
bl syscall_trace
b ret_slow_syscall
.align 5
#ifdef CONFIG_ALIGNMENT_TRAP
.type __cr_alignment, #object
__cr_alignment:
.word cr_alignment
#endif
.type sys_call_table, #object
ENTRY(sys_call_table)
#include "calls.S"
/*============================================================================
* Special system call wrappers
*/
@ r0 = syscall number
@ r5 = syscall table
.type sys_syscall, #function
sys_syscall:
eor scno, r0, #OS_NUMBER << 20
cmp scno, #NR_syscalls @ check range
stmleia sp, {r5, r6} @ shuffle args
movle r0, r1
movle r1, r2
movle r2, r3
movle r3, r4
ldrle pc, [tbl, scno, lsl #2]
b sys_ni_syscall
sys_fork_wrapper:
add r0, sp, #S_OFF
b sys_fork
sys_vfork_wrapper:
add r0, sp, #S_OFF
b sys_vfork
sys_execve_wrapper:
add r3, sp, #S_OFF
b sys_execve
sys_clone_wapper:
add r2, sp, #S_OFF
b sys_clone
sys_sigsuspend_wrapper:
add r3, sp, #S_OFF
b sys_sigsuspend
sys_rt_sigsuspend_wrapper:
add r2, sp, #S_OFF
b sys_rt_sigsuspend
sys_sigreturn_wrapper:
add r0, sp, #S_OFF
b sys_sigreturn
sys_rt_sigreturn_wrapper:
add r0, sp, #S_OFF
b sys_rt_sigreturn
sys_sigaltstack_wrapper:
ldr r2, [sp, #S_OFF + S_SP]
b do_sigaltstack
/*
* Note: off_4k (r5) is always units of 4K. If we can't do the requested
* offset, we return EINVAL. FIXME - this lost some stuff from arm32 to
* ifdefs. check it out.
*/
sys_mmap2:
tst r5, #((1 << (PAGE_SHIFT - 12)) - 1)
moveq r5, r5, lsr #PAGE_SHIFT - 12
streq r5, [sp, #4]
beq do_mmap2
mov r0, #-EINVAL
RETINSTR(mov,pc, lr)
/*
* Design issues:
* - We have several modes that each vector can be called from,
* each with its own set of registers. On entry to any vector,
* we *must* save the registers used in *that* mode.
*
* - This code must be as fast as possible.
*
* There are a few restrictions on the vectors:
* - the SWI vector cannot be called from *any* non-user mode
*
* - the FP emulator is *never* called from *any* non-user mode undefined
* instruction.
*
*/
.text
.macro handle_irq
1: mov r4, #IOC_BASE
ldrb r6, [r4, #0x24] @ get high priority first
adr r5, irq_prio_h
teq r6, #0
ldreqb r6, [r4, #0x14] @ get low priority
adreq r5, irq_prio_l
teq r6, #0 @ If an IRQ happened...
ldrneb r0, [r5, r6] @ get IRQ number
movne r1, sp @ get struct pt_regs
adrne lr, 1b @ Set return address to 1b
orrne lr, lr, #PSR_I_BIT | MODE_SVC26 @ (and force SVC mode)
bne asm_do_IRQ @ process IRQ (if asserted)
.endm
/*
* Interrupt table (incorporates priority)
*/
.macro irq_prio_table
irq_prio_l: .byte 0, 0, 1, 0, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3
.byte 4, 0, 1, 0, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3
.byte 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5
.byte 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5
.byte 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 3, 3, 3, 3, 3, 3
.byte 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 3, 3, 3, 3, 3, 3
.byte 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5
.byte 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5
.byte 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
.byte 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
.byte 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
.byte 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
.byte 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
.byte 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
.byte 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
.byte 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
irq_prio_h: .byte 0, 8, 9, 8,10,10,10,10,11,11,11,11,10,10,10,10
.byte 12, 8, 9, 8,10,10,10,10,11,11,11,11,10,10,10,10
.byte 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10
.byte 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10
.byte 14,14,14,14,10,10,10,10,11,11,11,11,10,10,10,10
.byte 14,14,14,14,10,10,10,10,11,11,11,11,10,10,10,10
.byte 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10
.byte 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10
.byte 15,15,15,15,10,10,10,10,11,11,11,11,10,10,10,10
.byte 15,15,15,15,10,10,10,10,11,11,11,11,10,10,10,10
.byte 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10
.byte 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10
.byte 15,15,15,15,10,10,10,10,11,11,11,11,10,10,10,10
.byte 15,15,15,15,10,10,10,10,11,11,11,11,10,10,10,10
.byte 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10
.byte 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10
.endm
#if 1
/*
* Uncomment these if you wish to get more debugging into about data aborts.
* FIXME - I bet we can find a way to encode these and keep performance.
*/
#define FAULT_CODE_LDRSTRPOST 0x80
#define FAULT_CODE_LDRSTRPRE 0x40
#define FAULT_CODE_LDRSTRREG 0x20
#define FAULT_CODE_LDMSTM 0x10
#define FAULT_CODE_LDCSTC 0x08
#endif
#define FAULT_CODE_PREFETCH 0x04
#define FAULT_CODE_WRITE 0x02
#define FAULT_CODE_FORCECOW 0x01
/*=============================================================================
* Undefined FIQs
*-----------------------------------------------------------------------------
*/
_unexp_fiq: ldr sp, .LCfiq
mov r12, #IOC_BASE
strb r12, [r12, #0x38] @ Disable FIQ register
teqp pc, #PSR_I_BIT | PSR_F_BIT | MODE_SVC26
mov r0, r0
stmfd sp!, {r0 - r3, ip, lr}
adr r0, Lfiqmsg
bl printk
ldmfd sp!, {r0 - r3, ip, lr}
teqp pc, #PSR_I_BIT | PSR_F_BIT | MODE_FIQ26
mov r0, r0
movs pc, lr
Lfiqmsg: .ascii "*** Unexpected FIQ\n\0"
.align
.LCfiq: .word __temp_fiq
.LCirq: .word __temp_irq
/*=============================================================================
* Undefined instruction handler
*-----------------------------------------------------------------------------
* Handles floating point instructions
*/
vector_undefinstr:
tst lr, #MODE_SVC26 @ did we come from a non-user mode?
bne __und_svc @ yes - deal with it.
/* Otherwise, fall through for the user-space (common) case. */
save_user_regs
zero_fp @ zero frame pointer
teqp pc, #PSR_I_BIT | MODE_SVC26 @ disable IRQs
.Lbug_undef:
ldr r4, .LC2
ldr pc, [r4] @ Call FP module entry point
/* FIXME - should we trap for a null pointer here? */
/* The SVC mode case */
__und_svc: save_svc_regs @ Non-user mode
mask_pc r0, lr
and r2, lr, #3
sub r0, r0, #4
mov r1, sp
bl do_undefinstr
restore_svc_regs
/* We get here if the FP emulator doesnt handle the undef instr.
* If the insn WAS handled, the emulator jumps to ret_from_exception by itself/
*/
.globl fpundefinstr
fpundefinstr:
mov r0, lr
mov r1, sp
teqp pc, #MODE_SVC26
bl do_undefinstr
b ret_from_exception @ Normal FP exit
#if defined CONFIG_FPE_NWFPE || defined CONFIG_FPE_FASTFPE
/* The FPE is always present */
.equ fpe_not_present, 0
#else
/* We get here if an undefined instruction happens and the floating
* point emulator is not present. If the offending instruction was
* a WFS, we just perform a normal return as if we had emulated the
* operation. This is a hack to allow some basic userland binaries
* to run so that the emulator module proper can be loaded. --philb
* FIXME - probably a broken useless hack...
*/
fpe_not_present:
adr r10, wfs_mask_data
ldmia r10, {r4, r5, r6, r7, r8}
ldr r10, [sp, #S_PC] @ Load PC
sub r10, r10, #4
mask_pc r10, r10
ldrt r10, [r10] @ get instruction
and r5, r10, r5
teq r5, r4 @ Is it WFS?
beq ret_from_exception
and r5, r10, r8
teq r5, r6 @ Is it LDF/STF on sp or fp?
teqne r5, r7
bne fpundefinstr
tst r10, #0x00200000 @ Does it have WB
beq ret_from_exception
and r4, r10, #255 @ get offset
and r6, r10, #0x000f0000
tst r10, #0x00800000 @ +/-
ldr r5, [sp, r6, lsr #14] @ Load reg
rsbeq r4, r4, #0
add r5, r5, r4, lsl #2
str r5, [sp, r6, lsr #14] @ Save reg
b ret_from_exception
wfs_mask_data: .word 0x0e200110 @ WFS/RFS
.word 0x0fef0fff
.word 0x0d0d0100 @ LDF [sp]/STF [sp]
.word 0x0d0b0100 @ LDF [fp]/STF [fp]
.word 0x0f0f0f00
#endif
.LC2: .word fp_enter
/*=============================================================================
* Prefetch abort handler
*-----------------------------------------------------------------------------
*/
#define DEBUG_UNDEF
/* remember: lr = USR pc */
vector_prefetch:
sub lr, lr, #4
tst lr, #MODE_SVC26
bne __pabt_invalid
save_user_regs
teqp pc, #MODE_SVC26 @ Enable IRQs...
mask_pc r0, lr @ Address of abort
mov r1, sp @ Tasks registers
bl do_PrefetchAbort
teq r0, #0 @ If non-zero, we believe this abort..
bne ret_from_exception
#ifdef DEBUG_UNDEF
adr r0, t
bl printk
#endif
ldr lr, [sp,#S_PC] @ FIXME program to test this on. I think its
b .Lbug_undef @ broken at the moment though!)
__pabt_invalid: save_svc_regs
mov r0, sp @ Prefetch aborts are definitely *not*
mov r1, #BAD_PREFETCH @ allowed in non-user modes. We cant
and r2, lr, #3 @ recover from this problem.
b bad_mode
#ifdef DEBUG_UNDEF
t: .ascii "*** undef ***\r\n\0"
.align
#endif
/*=============================================================================
* Address exception handler
*-----------------------------------------------------------------------------
* These aren't too critical.
* (they're not supposed to happen).
* In order to debug the reason for address exceptions in non-user modes,
* we have to obtain all the registers so that we can see what's going on.
*/
vector_addrexcptn:
sub lr, lr, #8
tst lr, #3
bne Laddrexcptn_not_user
save_user_regs
teq pc, #MODE_SVC26
mask_pc r0, lr @ Point to instruction
mov r1, sp @ Point to registers
mov r2, #0x400
mov lr, pc
bl do_excpt
b ret_from_exception
Laddrexcptn_not_user:
save_svc_regs
and r2, lr, #3
teq r2, #3
bne Laddrexcptn_illegal_mode
teqp pc, #MODE_SVC26
mask_pc r0, lr
mov r1, sp
orr r2, r2, #0x400
bl do_excpt
ldmia sp, {r0 - lr} @ I cant remember the reason I changed this...
add sp, sp, #15*4
movs pc, lr
Laddrexcptn_illegal_mode:
mov r0, sp
str lr, [sp, #-4]!
orr r1, r2, #PSR_I_BIT | PSR_F_BIT
teqp r1, #0 @ change into mode (wont be user mode)
mov r0, r0
mov r1, r8 @ Any register from r8 - r14 can be banked
mov r2, r9
mov r3, r10
mov r4, r11
mov r5, r12
mov r6, r13
mov r7, r14
teqp pc, #PSR_F_BIT | MODE_SVC26 @ back to svc
mov r0, r0
stmfd sp!, {r1-r7}
ldmia r0, {r0-r7}
stmfd sp!, {r0-r7}
mov r0, sp
mov r1, #BAD_ADDREXCPTN
b bad_mode
/*=============================================================================
* Interrupt (IRQ) handler
*-----------------------------------------------------------------------------
* Note: if the IRQ was taken whilst in user mode, then *no* kernel routine
* is running, so do not have to save svc lr.
*
* Entered in IRQ mode.
*/
vector_IRQ: ldr sp, .LCirq @ Setup some temporary stack
sub lr, lr, #4
str lr, [sp] @ push return address
tst lr, #3
bne __irq_non_usr
__irq_usr: teqp pc, #PSR_I_BIT | MODE_SVC26 @ Enter SVC mode
mov r0, r0
ldr lr, .LCirq
ldr lr, [lr] @ Restore lr for jump back to USR
save_user_regs
handle_irq
mov why, #0
get_thread_info tsk
b ret_to_user
@ Place the IRQ priority table here so that the handle_irq macros above
@ and below here can access it.
irq_prio_table
__irq_non_usr: teqp pc, #PSR_I_BIT | MODE_SVC26 @ Enter SVC mode
mov r0, r0
save_svc_regs_irq
and r2, lr, #3
teq r2, #3
bne __irq_invalid @ IRQ not from SVC mode
handle_irq
restore_svc_regs
__irq_invalid: mov r0, sp
mov r1, #BAD_IRQ
b bad_mode
/*=============================================================================
* Data abort handler code
*-----------------------------------------------------------------------------
*
* This handles both exceptions from user and SVC modes, computes the address
* range of the problem, and does any correction that is required. It then
* calls the kernel data abort routine.
*
* This is where I wish that the ARM would tell you which address aborted.
*/
vector_data: sub lr, lr, #8 @ Correct lr
tst lr, #3
bne Ldata_not_user
save_user_regs
teqp pc, #MODE_SVC26
mask_pc r0, lr
bl Ldata_do
b ret_from_exception
Ldata_not_user:
save_svc_regs
and r2, lr, #3
teq r2, #3
bne Ldata_illegal_mode
tst lr, #PSR_I_BIT
teqeqp pc, #MODE_SVC26
mask_pc r0, lr
bl Ldata_do
restore_svc_regs
Ldata_illegal_mode:
mov r0, sp
mov r1, #BAD_DATA
b bad_mode
Ldata_do: mov r3, sp
ldr r4, [r0] @ Get instruction
mov r2, #0
tst r4, #1 << 20 @ Check to see if it is a write instruction
orreq r2, r2, #FAULT_CODE_WRITE @ Indicate write instruction
mov r1, r4, lsr #22 @ Now branch to the relevent processing routine
and r1, r1, #15 << 2
add pc, pc, r1
movs pc, lr
b Ldata_unknown
b Ldata_unknown
b Ldata_unknown
b Ldata_unknown
b Ldata_ldrstr_post @ ldr rd, [rn], #m
b Ldata_ldrstr_numindex @ ldr rd, [rn, #m] @ RegVal
b Ldata_ldrstr_post @ ldr rd, [rn], rm
b Ldata_ldrstr_regindex @ ldr rd, [rn, rm]
b Ldata_ldmstm @ ldm*a rn, <rlist>
b Ldata_ldmstm @ ldm*b rn, <rlist>
b Ldata_unknown
b Ldata_unknown
b Ldata_ldrstr_post @ ldc rd, [rn], #m @ Same as ldr rd, [rn], #m
b Ldata_ldcstc_pre @ ldc rd, [rn, #m]
b Ldata_unknown
Ldata_unknown: @ Part of jumptable
mov r0, r1
mov r1, r4
mov r2, r3
b baddataabort
Ldata_ldrstr_post:
mov r0, r4, lsr #14 @ Get Rn
and r0, r0, #15 << 2 @ Mask out reg.
teq r0, #15 << 2
ldr r0, [r3, r0] @ Get register
biceq r0, r0, #PCMASK
mov r1, r0
#ifdef FAULT_CODE_LDRSTRPOST
orr r2, r2, #FAULT_CODE_LDRSTRPOST
#endif
b do_DataAbort
Ldata_ldrstr_numindex:
mov r0, r4, lsr #14 @ Get Rn
and r0, r0, #15 << 2 @ Mask out reg.
teq r0, #15 << 2
ldr r0, [r3, r0] @ Get register
mov r1, r4, lsl #20
biceq r0, r0, #PCMASK
tst r4, #1 << 23
addne r0, r0, r1, lsr #20
subeq r0, r0, r1, lsr #20
mov r1, r0
#ifdef FAULT_CODE_LDRSTRPRE
orr r2, r2, #FAULT_CODE_LDRSTRPRE
#endif
b do_DataAbort
Ldata_ldrstr_regindex:
mov r0, r4, lsr #14 @ Get Rn
and r0, r0, #15 << 2 @ Mask out reg.
teq r0, #15 << 2
ldr r0, [r3, r0] @ Get register
and r7, r4, #15
biceq r0, r0, #PCMASK
teq r7, #15 @ Check for PC
ldr r7, [r3, r7, lsl #2] @ Get Rm
and r8, r4, #0x60 @ Get shift types
biceq r7, r7, #PCMASK
mov r9, r4, lsr #7 @ Get shift amount
and r9, r9, #31
teq r8, #0
moveq r7, r7, lsl r9
teq r8, #0x20 @ LSR shift
moveq r7, r7, lsr r9
teq r8, #0x40 @ ASR shift
moveq r7, r7, asr r9
teq r8, #0x60 @ ROR shift
moveq r7, r7, ror r9
tst r4, #1 << 23
addne r0, r0, r7
subeq r0, r0, r7 @ Apply correction
mov r1, r0
#ifdef FAULT_CODE_LDRSTRREG
orr r2, r2, #FAULT_CODE_LDRSTRREG
#endif
b do_DataAbort
Ldata_ldmstm:
mov r7, #0x11
orr r7, r7, r7, lsl #8
and r0, r4, r7
and r1, r4, r7, lsl #1
add r0, r0, r1, lsr #1
and r1, r4, r7, lsl #2
add r0, r0, r1, lsr #2
and r1, r4, r7, lsl #3
add r0, r0, r1, lsr #3
add r0, r0, r0, lsr #8
add r0, r0, r0, lsr #4
and r7, r0, #15 @ r7 = no. of registers to transfer.
mov r5, r4, lsr #14 @ Get Rn
and r5, r5, #15 << 2
ldr r0, [r3, r5] @ Get reg
eor r6, r4, r4, lsl #2
tst r6, #1 << 23 @ Check inc/dec ^ writeback
rsbeq r7, r7, #0
add r7, r0, r7, lsl #2 @ Do correction (signed)
subne r1, r7, #1
subeq r1, r0, #1
moveq r0, r7
tst r4, #1 << 21 @ Check writeback
strne r7, [r3, r5]
eor r6, r4, r4, lsl #1
tst r6, #1 << 24 @ Check Pre/Post ^ inc/dec
addeq r0, r0, #4
addeq r1, r1, #4
teq r5, #15*4 @ CHECK FOR PC
biceq r1, r1, #PCMASK
biceq r0, r0, #PCMASK
#ifdef FAULT_CODE_LDMSTM
orr r2, r2, #FAULT_CODE_LDMSTM
#endif
b do_DataAbort
Ldata_ldcstc_pre:
mov r0, r4, lsr #14 @ Get Rn
and r0, r0, #15 << 2 @ Mask out reg.
teq r0, #15 << 2
ldr r0, [r3, r0] @ Get register
mov r1, r4, lsl #24 @ Get offset
biceq r0, r0, #PCMASK
tst r4, #1 << 23
addne r0, r0, r1, lsr #24
subeq r0, r0, r1, lsr #24
mov r1, r0
#ifdef FAULT_CODE_LDCSTC
orr r2, r2, #FAULT_CODE_LDCSTC
#endif
b do_DataAbort
/*
* This is the return code to user mode for abort handlers
*/
ENTRY(ret_from_exception)
get_thread_info tsk
mov why, #0
b ret_to_user
.data
ENTRY(fp_enter)
.word fpe_not_present
.text
/*
* Register switch for older 26-bit only ARMs
*/
ENTRY(__switch_to)
add r0, r0, #TI_CPU_SAVE
stmia r0, {r4 - sl, fp, sp, lr}
add r1, r1, #TI_CPU_SAVE
ldmia r1, {r4 - sl, fp, sp, pc}^
/*
*=============================================================================
* Low-level interface code
*-----------------------------------------------------------------------------
* Trap initialisation
*-----------------------------------------------------------------------------
*
* Note - FIQ code has changed. The default is a couple of words in 0x1c, 0x20
* that call _unexp_fiq. Nowever, we now copy the FIQ routine to 0x1c (removes
* some excess cycles).
*
* What we need to put into 0-0x1c are branches to branch to the kernel.
*/
.section ".init.text",#alloc,#execinstr
.Ljump_addresses:
swi SYS_ERROR0
.word vector_undefinstr - 12
.word vector_swi - 16
.word vector_prefetch - 20
.word vector_data - 24
.word vector_addrexcptn - 28
.word vector_IRQ - 32
.word _unexp_fiq - 36
b . + 8
/*
* initialise the trap system
*/
ENTRY(__trap_init)
stmfd sp!, {r4 - r7, lr}
adr r1, .Ljump_addresses
ldmia r1, {r1 - r7, ip, lr}
orr r2, lr, r2, lsr #2
orr r3, lr, r3, lsr #2
orr r4, lr, r4, lsr #2
orr r5, lr, r5, lsr #2
orr r6, lr, r6, lsr #2
orr r7, lr, r7, lsr #2
orr ip, lr, ip, lsr #2
mov r0, #0
stmia r0, {r1 - r7, ip}
ldmfd sp!, {r4 - r7, pc}^
.bss
__temp_irq: .space 4 @ saved lr_irq
__temp_fiq: .space 128

202
arch/arm26/kernel/fiq.c Normal file
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/*
* linux/arch/arm26/kernel/fiq.c
*
* Copyright (C) 1998 Russell King
* Copyright (C) 1998, 1999 Phil Blundell
* Copyright (C) 2003 Ian Molton
*
* FIQ support written by Philip Blundell <philb@gnu.org>, 1998.
*
* FIQ support re-written by Russell King to be more generic
*
* We now properly support a method by which the FIQ handlers can
* be stacked onto the vector. We still do not support sharing
* the FIQ vector itself.
*
* Operation is as follows:
* 1. Owner A claims FIQ:
* - default_fiq relinquishes control.
* 2. Owner A:
* - inserts code.
* - sets any registers,
* - enables FIQ.
* 3. Owner B claims FIQ:
* - if owner A has a relinquish function.
* - disable FIQs.
* - saves any registers.
* - returns zero.
* 4. Owner B:
* - inserts code.
* - sets any registers,
* - enables FIQ.
* 5. Owner B releases FIQ:
* - Owner A is asked to reacquire FIQ:
* - inserts code.
* - restores saved registers.
* - enables FIQ.
* 6. Goto 3
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/init.h>
#include <linux/seq_file.h>
#include <asm/fiq.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/pgalloc.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#define FIQ_VECTOR (vectors_base() + 0x1c)
static unsigned long no_fiq_insn;
#define unprotect_page_0()
#define protect_page_0()
/* Default reacquire function
* - we always relinquish FIQ control
* - we always reacquire FIQ control
*/
static int fiq_def_op(void *ref, int relinquish)
{
if (!relinquish) {
unprotect_page_0();
*(unsigned long *)FIQ_VECTOR = no_fiq_insn;
protect_page_0();
}
return 0;
}
static struct fiq_handler default_owner = {
.name = "default",
.fiq_op = fiq_def_op,
};
static struct fiq_handler *current_fiq = &default_owner;
int show_fiq_list(struct seq_file *p, void *v)
{
if (current_fiq != &default_owner)
seq_printf(p, "FIQ: %s\n", current_fiq->name);
return 0;
}
void set_fiq_handler(void *start, unsigned int length)
{
unprotect_page_0();
memcpy((void *)FIQ_VECTOR, start, length);
protect_page_0();
}
/*
* Taking an interrupt in FIQ mode is death, so both these functions
* disable irqs for the duration.
*/
void set_fiq_regs(struct pt_regs *regs)
{
register unsigned long tmp, tmp2;
__asm__ volatile (
"mov %0, pc
bic %1, %0, #0x3
orr %1, %1, %3
teqp %1, #0 @ select FIQ mode
mov r0, r0
ldmia %2, {r8 - r14}
teqp %0, #0 @ return to SVC mode
mov r0, r0"
: "=&r" (tmp), "=&r" (tmp2)
: "r" (&regs->ARM_r8), "I" (PSR_I_BIT | PSR_F_BIT | MODE_FIQ26)
/* These registers aren't modified by the above code in a way
visible to the compiler, but we mark them as clobbers anyway
so that GCC won't put any of the input or output operands in
them. */
: "r8", "r9", "r10", "r11", "r12", "r13", "r14");
}
void get_fiq_regs(struct pt_regs *regs)
{
register unsigned long tmp, tmp2;
__asm__ volatile (
"mov %0, pc
bic %1, %0, #0x3
orr %1, %1, %3
teqp %1, #0 @ select FIQ mode
mov r0, r0
stmia %2, {r8 - r14}
teqp %0, #0 @ return to SVC mode
mov r0, r0"
: "=&r" (tmp), "=&r" (tmp2)
: "r" (&regs->ARM_r8), "I" (PSR_I_BIT | PSR_F_BIT | MODE_FIQ26)
/* These registers aren't modified by the above code in a way
visible to the compiler, but we mark them as clobbers anyway
so that GCC won't put any of the input or output operands in
them. */
: "r8", "r9", "r10", "r11", "r12", "r13", "r14");
}
int claim_fiq(struct fiq_handler *f)
{
int ret = 0;
if (current_fiq) {
ret = -EBUSY;
if (current_fiq->fiq_op != NULL)
ret = current_fiq->fiq_op(current_fiq->dev_id, 1);
}
if (!ret) {
f->next = current_fiq;
current_fiq = f;
}
return ret;
}
void release_fiq(struct fiq_handler *f)
{
if (current_fiq != f) {
printk(KERN_ERR "%s FIQ trying to release %s FIQ\n",
f->name, current_fiq->name);
#ifdef CONFIG_DEBUG_ERRORS
__backtrace();
#endif
return;
}
do
current_fiq = current_fiq->next;
while (current_fiq->fiq_op(current_fiq->dev_id, 0));
}
void enable_fiq(int fiq)
{
enable_irq(fiq + FIQ_START);
}
void disable_fiq(int fiq)
{
disable_irq(fiq + FIQ_START);
}
EXPORT_SYMBOL(set_fiq_handler);
EXPORT_SYMBOL(set_fiq_regs);
EXPORT_SYMBOL(get_fiq_regs);
EXPORT_SYMBOL(claim_fiq);
EXPORT_SYMBOL(release_fiq);
EXPORT_SYMBOL(enable_fiq);
EXPORT_SYMBOL(disable_fiq);
void __init init_FIQ(void)
{
no_fiq_insn = *(unsigned long *)FIQ_VECTOR;
set_fs(get_fs());
}

113
arch/arm26/kernel/head.S Normal file
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/*
* linux/arch/arm26/kernel/head.S
*
* Copyright (C) 1994-2000 Russell King
* Copyright (C) 2003 Ian Molton
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 26-bit kernel startup code
*/
#include <linux/config.h>
#include <linux/linkage.h>
#include <asm/mach-types.h>
.globl swapper_pg_dir
.equ swapper_pg_dir, 0x0207d000
/*
* Entry point.
*/
.section ".init.text",#alloc,#execinstr
ENTRY(stext)
__entry:
cmp pc, #0x02000000
ldrlt pc, LC0 @ if 0x01800000, call at 0x02080000
teq r0, #0 @ Check for old calling method
blne oldparams @ Move page if old
adr r0, LC0
ldmib r0, {r2-r5, sp} @ Setup stack (and fetch other values)
mov r0, #0 @ Clear BSS
1: cmp r2, r3
strcc r0, [r2], #4
bcc 1b
bl detect_proc_type
str r0, [r4]
bl detect_arch_type
str r0, [r5]
#ifdef CONFIG_XIP_KERNEL
ldr r3, ETEXT @ data section copy
ldr r4, SDATA
ldr r5, EDATA
1:
ldr r6, [r3], #4
str r6, [r4], #4
cmp r4, r5
blt 1b
#endif
mov fp, #0
b start_kernel
LC0: .word _stext
.word __bss_start @ r2
.word _end @ r3
.word processor_id @ r4
.word __machine_arch_type @ r5
.word init_thread_union+8192 @ sp
#ifdef CONFIG_XIP_KERNEL
ETEXT: .word _endtext
SDATA: .word _sdata
EDATA: .word __bss_start
#endif
arm2_id: .long 0x41560200 @ ARM2 and 250 dont have a CPUID
arm250_id: .long 0x41560250 @ So we create some after probing for them
.align
oldparams: mov r4, #0x02000000
add r3, r4, #0x00080000
add r4, r4, #0x0007c000
1: ldmia r0!, {r5 - r12}
stmia r4!, {r5 - r12}
cmp r4, r3
blt 1b
mov pc, lr
/*
* We need some way to automatically detect the difference between
* these two machines. Unfortunately, it is not possible to detect
* the presence of the SuperIO chip, because that will hang the old
* Archimedes machines solid.
*/
/* DAG: Outdated, these have been combined !!!!!!! */
detect_arch_type:
#if defined(CONFIG_ARCH_ARC)
mov r0, #MACH_TYPE_ARCHIMEDES
#elif defined(CONFIG_ARCH_A5K)
mov r0, #MACH_TYPE_A5K
#endif
mov pc, lr
detect_proc_type:
mov ip, lr
mov r2, #0xea000000 @ Point undef instr to continuation
adr r0, continue - 12
orr r0, r2, r0, lsr #2
mov r1, #0
str r0, [r1, #4]
ldr r0, arm2_id
swp r2, r2, [r1] @ check for swp (ARM2 cant)
ldr r0, arm250_id
mrc 15, 0, r3, c0, c0 @ check for CP#15 (ARM250 cant)
mov r0, r3
continue: mov r2, #0xeb000000 @ Make undef vector loop
sub r2, r2, #2
str r2, [r1, #4]
mov pc, ip

49
arch/arm26/kernel/init_task.c Normal file
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/*
* linux/arch/arm26/kernel/init_task.c
*
* Copyright (C) 2003 Ian Molton
*
*/
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/init_task.h>
#include <linux/mqueue.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
static struct fs_struct init_fs = INIT_FS;
static struct files_struct init_files = INIT_FILES;
static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
struct mm_struct init_mm = INIT_MM(init_mm);
EXPORT_SYMBOL(init_mm);
/*
* Initial thread structure.
*
* We need to make sure that this is 8192-byte aligned due to the
* way process stacks are handled. This is done by making sure
* the linker maps this in the .text segment right after head.S,
* and making the linker scripts ensure the proper alignment.
*
* FIXME - should this be 32K alignment on arm26?
*
* The things we do for performance...
*/
union thread_union init_thread_union
__attribute__((__section__(".init.task"))) =
{ INIT_THREAD_INFO(init_task) };
/*
* Initial task structure.
*
* All other task structs will be allocated on slabs in fork.c
*/
struct task_struct init_task = INIT_TASK(init_task);
EXPORT_SYMBOL(init_task);

716
arch/arm26/kernel/irq.c Normal file
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/*
* linux/arch/arm/kernel/irq.c
*
* Copyright (C) 1992 Linus Torvalds
* Modifications for ARM processor Copyright (C) 1995-2000 Russell King.
* 'Borrowed' for ARM26 and (C) 2003 Ian Molton.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This file contains the code used by various IRQ handling routines:
* asking for different IRQ's should be done through these routines
* instead of just grabbing them. Thus setups with different IRQ numbers
* shouldn't result in any weird surprises, and installing new handlers
* should be easier.
*
* IRQ's are in fact implemented a bit like signal handlers for the kernel.
* Naturally it's not a 1:1 relation, but there are similarities.
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/ptrace.h>
#include <linux/kernel_stat.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <linux/smp.h>
#include <linux/init.h>
#include <linux/seq_file.h>
#include <linux/errno.h>
#include <asm/irq.h>
#include <asm/system.h>
#include <asm/irqchip.h>
//FIXME - this ought to be in a header IMO
void __init arc_init_irq(void);
/*
* Maximum IRQ count. Currently, this is arbitary. However, it should
* not be set too low to prevent false triggering. Conversely, if it
* is set too high, then you could miss a stuck IRQ.
*
* FIXME Maybe we ought to set a timer and re-enable the IRQ at a later time?
*/
#define MAX_IRQ_CNT 100000
static volatile unsigned long irq_err_count;
static DEFINE_SPINLOCK(irq_controller_lock);
struct irqdesc irq_desc[NR_IRQS];
/*
* Dummy mask/unmask handler
*/
void dummy_mask_unmask_irq(unsigned int irq)
{
}
void do_bad_IRQ(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
{
irq_err_count += 1;
printk(KERN_ERR "IRQ: spurious interrupt %d\n", irq);
}
static struct irqchip bad_chip = {
.ack = dummy_mask_unmask_irq,
.mask = dummy_mask_unmask_irq,
.unmask = dummy_mask_unmask_irq,
};
static struct irqdesc bad_irq_desc = {
.chip = &bad_chip,
.handle = do_bad_IRQ,
.depth = 1,
};
/**
* disable_irq - disable an irq and wait for completion
* @irq: Interrupt to disable
*
* Disable the selected interrupt line. We do this lazily.
*
* This function may be called from IRQ context.
*/
void disable_irq(unsigned int irq)
{
struct irqdesc *desc = irq_desc + irq;
unsigned long flags;
spin_lock_irqsave(&irq_controller_lock, flags);
if (!desc->depth++)
desc->enabled = 0;
spin_unlock_irqrestore(&irq_controller_lock, flags);
}
/**
* enable_irq - enable interrupt handling on an irq
* @irq: Interrupt to enable
*
* Re-enables the processing of interrupts on this IRQ line.
* Note that this may call the interrupt handler, so you may
* get unexpected results if you hold IRQs disabled.
*
* This function may be called from IRQ context.
*/
void enable_irq(unsigned int irq)
{
struct irqdesc *desc = irq_desc + irq;
unsigned long flags;
int pending = 0;
spin_lock_irqsave(&irq_controller_lock, flags);
if (unlikely(!desc->depth)) {
printk("enable_irq(%u) unbalanced from %p\n", irq,
__builtin_return_address(0)); //FIXME bum addresses reported - why?
} else if (!--desc->depth) {
desc->probing = 0;
desc->enabled = 1;
desc->chip->unmask(irq);
pending = desc->pending;
desc->pending = 0;
/*
* If the interrupt was waiting to be processed,
* retrigger it.
*/
if (pending)
desc->chip->rerun(irq);
}
spin_unlock_irqrestore(&irq_controller_lock, flags);
}
int show_interrupts(struct seq_file *p, void *v)
{
int i = *(loff_t *) v;
struct irqaction * action;
if (i < NR_IRQS) {
action = irq_desc[i].action;
if (!action)
continue;
seq_printf(p, "%3d: %10u ", i, kstat_irqs(i));
seq_printf(p, " %s", action->name);
for (action = action->next; action; action = action->next) {
seq_printf(p, ", %s", action->name);
}
seq_putc(p, '\n');
} else if (i == NR_IRQS) {
show_fiq_list(p, v);
seq_printf(p, "Err: %10lu\n", irq_err_count);
}
return 0;
}
/*
* IRQ lock detection.
*
* Hopefully, this should get us out of a few locked situations.
* However, it may take a while for this to happen, since we need
* a large number if IRQs to appear in the same jiffie with the
* same instruction pointer (or within 2 instructions).
*/
static int check_irq_lock(struct irqdesc *desc, int irq, struct pt_regs *regs)
{
unsigned long instr_ptr = instruction_pointer(regs);
if (desc->lck_jif == jiffies &&
desc->lck_pc >= instr_ptr && desc->lck_pc < instr_ptr + 8) {
desc->lck_cnt += 1;
if (desc->lck_cnt > MAX_IRQ_CNT) {
printk(KERN_ERR "IRQ LOCK: IRQ%d is locking the system, disabled\n", irq);
return 1;
}
} else {
desc->lck_cnt = 0;
desc->lck_pc = instruction_pointer(regs);
desc->lck_jif = jiffies;
}
return 0;
}
static void
__do_irq(unsigned int irq, struct irqaction *action, struct pt_regs *regs)
{
unsigned int status;
int ret;
spin_unlock(&irq_controller_lock);
if (!(action->flags & SA_INTERRUPT))
local_irq_enable();
status = 0;
do {
ret = action->handler(irq, action->dev_id, regs);
if (ret == IRQ_HANDLED)
status |= action->flags;
action = action->next;
} while (action);
if (status & SA_SAMPLE_RANDOM)
add_interrupt_randomness(irq);
spin_lock_irq(&irq_controller_lock);
}
/*
* This is for software-decoded IRQs. The caller is expected to
* handle the ack, clear, mask and unmask issues.
*/
void
do_simple_IRQ(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
{
struct irqaction *action;
const int cpu = smp_processor_id();
desc->triggered = 1;
kstat_cpu(cpu).irqs[irq]++;
action = desc->action;
if (action)
__do_irq(irq, desc->action, regs);
}
/*
* Most edge-triggered IRQ implementations seem to take a broken
* approach to this. Hence the complexity.
*/
void
do_edge_IRQ(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
{
const int cpu = smp_processor_id();
desc->triggered = 1;
/*
* If we're currently running this IRQ, or its disabled,
* we shouldn't process the IRQ. Instead, turn on the
* hardware masks.
*/
if (unlikely(desc->running || !desc->enabled))
goto running;
/*
* Acknowledge and clear the IRQ, but don't mask it.
*/
desc->chip->ack(irq);
/*
* Mark the IRQ currently in progress.
*/
desc->running = 1;
kstat_cpu(cpu).irqs[irq]++;
do {
struct irqaction *action;
action = desc->action;
if (!action)
break;
if (desc->pending && desc->enabled) {
desc->pending = 0;
desc->chip->unmask(irq);
}
__do_irq(irq, action, regs);
} while (desc->pending);
desc->running = 0;
/*
* If we were disabled or freed, shut down the handler.
*/
if (likely(desc->action && !check_irq_lock(desc, irq, regs)))
return;
running:
/*
* We got another IRQ while this one was masked or
* currently running. Delay it.
*/
desc->pending = 1;
desc->chip->mask(irq);
desc->chip->ack(irq);
}
/*
* Level-based IRQ handler. Nice and simple.
*/
void
do_level_IRQ(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
{
struct irqaction *action;
const int cpu = smp_processor_id();
desc->triggered = 1;
/*
* Acknowledge, clear _AND_ disable the interrupt.
*/
desc->chip->ack(irq);
if (likely(desc->enabled)) {
kstat_cpu(cpu).irqs[irq]++;
/*
* Return with this interrupt masked if no action
*/
action = desc->action;
if (action) {
__do_irq(irq, desc->action, regs);
if (likely(desc->enabled &&
!check_irq_lock(desc, irq, regs)))
desc->chip->unmask(irq);
}
}
}
/*
* do_IRQ handles all hardware IRQ's. Decoded IRQs should not
* come via this function. Instead, they should provide their
* own 'handler'
*/
asmlinkage void asm_do_IRQ(int irq, struct pt_regs *regs)
{
struct irqdesc *desc = irq_desc + irq;
/*
* Some hardware gives randomly wrong interrupts. Rather
* than crashing, do something sensible.
*/
if (irq >= NR_IRQS)
desc = &bad_irq_desc;
irq_enter();
spin_lock(&irq_controller_lock);
desc->handle(irq, desc, regs);
spin_unlock(&irq_controller_lock);
irq_exit();
}
void __set_irq_handler(unsigned int irq, irq_handler_t handle, int is_chained)
{
struct irqdesc *desc;
unsigned long flags;
if (irq >= NR_IRQS) {
printk(KERN_ERR "Trying to install handler for IRQ%d\n", irq);
return;
}
if (handle == NULL)
handle = do_bad_IRQ;
desc = irq_desc + irq;
if (is_chained && desc->chip == &bad_chip)
printk(KERN_WARNING "Trying to install chained handler for IRQ%d\n", irq);
spin_lock_irqsave(&irq_controller_lock, flags);
if (handle == do_bad_IRQ) {
desc->chip->mask(irq);
desc->chip->ack(irq);
desc->depth = 1;
desc->enabled = 0;
}
desc->handle = handle;
if (handle != do_bad_IRQ && is_chained) {
desc->valid = 0;
desc->probe_ok = 0;
desc->depth = 0;
desc->chip->unmask(irq);
}
spin_unlock_irqrestore(&irq_controller_lock, flags);
}
void set_irq_chip(unsigned int irq, struct irqchip *chip)
{
struct irqdesc *desc;
unsigned long flags;
if (irq >= NR_IRQS) {
printk(KERN_ERR "Trying to install chip for IRQ%d\n", irq);
return;
}
if (chip == NULL)
chip = &bad_chip;
desc = irq_desc + irq;
spin_lock_irqsave(&irq_controller_lock, flags);
desc->chip = chip;
spin_unlock_irqrestore(&irq_controller_lock, flags);
}
int set_irq_type(unsigned int irq, unsigned int type)
{
struct irqdesc *desc;
unsigned long flags;
int ret = -ENXIO;
if (irq >= NR_IRQS) {
printk(KERN_ERR "Trying to set irq type for IRQ%d\n", irq);
return -ENODEV;
}
desc = irq_desc + irq;
if (desc->chip->type) {
spin_lock_irqsave(&irq_controller_lock, flags);
ret = desc->chip->type(irq, type);
spin_unlock_irqrestore(&irq_controller_lock, flags);
}
return ret;
}
void set_irq_flags(unsigned int irq, unsigned int iflags)
{
struct irqdesc *desc;
unsigned long flags;
if (irq >= NR_IRQS) {
printk(KERN_ERR "Trying to set irq flags for IRQ%d\n", irq);
return;
}
desc = irq_desc + irq;
spin_lock_irqsave(&irq_controller_lock, flags);
desc->valid = (iflags & IRQF_VALID) != 0;
desc->probe_ok = (iflags & IRQF_PROBE) != 0;
desc->noautoenable = (iflags & IRQF_NOAUTOEN) != 0;
spin_unlock_irqrestore(&irq_controller_lock, flags);
}
int setup_irq(unsigned int irq, struct irqaction *new)
{
int shared = 0;
struct irqaction *old, **p;
unsigned long flags;
struct irqdesc *desc;
/*
* Some drivers like serial.c use request_irq() heavily,
* so we have to be careful not to interfere with a
* running system.
*/
if (new->flags & SA_SAMPLE_RANDOM) {
/*
* This function might sleep, we want to call it first,
* outside of the atomic block.
* Yes, this might clear the entropy pool if the wrong
* driver is attempted to be loaded, without actually
* installing a new handler, but is this really a problem,
* only the sysadmin is able to do this.
*/
rand_initialize_irq(irq);
}
/*
* The following block of code has to be executed atomically
*/
desc = irq_desc + irq;
spin_lock_irqsave(&irq_controller_lock, flags);
p = &desc->action;
if ((old = *p) != NULL) {
/* Can't share interrupts unless both agree to */
if (!(old->flags & new->flags & SA_SHIRQ)) {
spin_unlock_irqrestore(&irq_controller_lock, flags);
return -EBUSY;
}
/* add new interrupt at end of irq queue */
do {
p = &old->next;
old = *p;
} while (old);
shared = 1;
}
*p = new;
if (!shared) {
desc->probing = 0;
desc->running = 0;
desc->pending = 0;
desc->depth = 1;
if (!desc->noautoenable) {
desc->depth = 0;
desc->enabled = 1;
desc->chip->unmask(irq);
}
}
spin_unlock_irqrestore(&irq_controller_lock, flags);
return 0;
}
/**
* request_irq - allocate an interrupt line
* @irq: Interrupt line to allocate
* @handler: Function to be called when the IRQ occurs
* @irqflags: Interrupt type flags
* @devname: An ascii name for the claiming device
* @dev_id: A cookie passed back to the handler function
*
* This call allocates interrupt resources and enables the
* interrupt line and IRQ handling. From the point this
* call is made your handler function may be invoked. Since
* your handler function must clear any interrupt the board
* raises, you must take care both to initialise your hardware
* and to set up the interrupt handler in the right order.
*
* Dev_id must be globally unique. Normally the address of the
* device data structure is used as the cookie. Since the handler
* receives this value it makes sense to use it.
*
* If your interrupt is shared you must pass a non NULL dev_id
* as this is required when freeing the interrupt.
*
* Flags:
*
* SA_SHIRQ Interrupt is shared
*
* SA_INTERRUPT Disable local interrupts while processing
*
* SA_SAMPLE_RANDOM The interrupt can be used for entropy
*
*/
//FIXME - handler used to return void - whats the significance of the change?
int request_irq(unsigned int irq, irqreturn_t (*handler)(int, void *, struct pt_regs *),
unsigned long irq_flags, const char * devname, void *dev_id)
{
unsigned long retval;
struct irqaction *action;
if (irq >= NR_IRQS || !irq_desc[irq].valid || !handler ||
(irq_flags & SA_SHIRQ && !dev_id))
return -EINVAL;
action = (struct irqaction *)kmalloc(sizeof(struct irqaction), GFP_KERNEL);
if (!action)
return -ENOMEM;
action->handler = handler;
action->flags = irq_flags;
cpus_clear(action->mask);
action->name = devname;
action->next = NULL;
action->dev_id = dev_id;
retval = setup_irq(irq, action);
if (retval)
kfree(action);
return retval;
}
EXPORT_SYMBOL(request_irq);
/**
* free_irq - free an interrupt
* @irq: Interrupt line to free
* @dev_id: Device identity to free
*
* Remove an interrupt handler. The handler is removed and if the
* interrupt line is no longer in use by any driver it is disabled.
* On a shared IRQ the caller must ensure the interrupt is disabled
* on the card it drives before calling this function.
*
* This function may be called from interrupt context.
*/
void free_irq(unsigned int irq, void *dev_id)
{
struct irqaction * action, **p;
unsigned long flags;
if (irq >= NR_IRQS || !irq_desc[irq].valid) {
printk(KERN_ERR "Trying to free IRQ%d\n",irq);
#ifdef CONFIG_DEBUG_ERRORS
__backtrace();
#endif
return;
}
spin_lock_irqsave(&irq_controller_lock, flags);
for (p = &irq_desc[irq].action; (action = *p) != NULL; p = &action->next) {
if (action->dev_id != dev_id)
continue;
/* Found it - now free it */
*p = action->next;
kfree(action);
goto out;
}
printk(KERN_ERR "Trying to free free IRQ%d\n",irq);
#ifdef CONFIG_DEBUG_ERRORS
__backtrace();
#endif
out:
spin_unlock_irqrestore(&irq_controller_lock, flags);
}
EXPORT_SYMBOL(free_irq);
/* Start the interrupt probing. Unlike other architectures,
* we don't return a mask of interrupts from probe_irq_on,
* but return the number of interrupts enabled for the probe.
* The interrupts which have been enabled for probing is
* instead recorded in the irq_desc structure.
*/
unsigned long probe_irq_on(void)
{
unsigned int i, irqs = 0;
unsigned long delay;
/*
* first snaffle up any unassigned but
* probe-able interrupts
*/
spin_lock_irq(&irq_controller_lock);
for (i = 0; i < NR_IRQS; i++) {
if (!irq_desc[i].probe_ok || irq_desc[i].action)
continue;
irq_desc[i].probing = 1;
irq_desc[i].triggered = 0;
if (irq_desc[i].chip->type)
irq_desc[i].chip->type(i, IRQT_PROBE);
irq_desc[i].chip->unmask(i);
irqs += 1;
}
spin_unlock_irq(&irq_controller_lock);
/*
* wait for spurious interrupts to mask themselves out again
*/
for (delay = jiffies + HZ/10; time_before(jiffies, delay); )
/* min 100ms delay */;
/*
* now filter out any obviously spurious interrupts
*/
spin_lock_irq(&irq_controller_lock);
for (i = 0; i < NR_IRQS; i++) {
if (irq_desc[i].probing && irq_desc[i].triggered) {
irq_desc[i].probing = 0;
irqs -= 1;
}
}
spin_unlock_irq(&irq_controller_lock);
return irqs;
}
EXPORT_SYMBOL(probe_irq_on);
/*
* Possible return values:
* >= 0 - interrupt number
* -1 - no interrupt/many interrupts
*/
int probe_irq_off(unsigned long irqs)
{
unsigned int i;
int irq_found = NO_IRQ;
/*
* look at the interrupts, and find exactly one
* that we were probing has been triggered
*/
spin_lock_irq(&irq_controller_lock);
for (i = 0; i < NR_IRQS; i++) {
if (irq_desc[i].probing &&
irq_desc[i].triggered) {
if (irq_found != NO_IRQ) {
irq_found = NO_IRQ;
goto out;
}
irq_found = i;
}
}
if (irq_found == -1)
irq_found = NO_IRQ;
out:
spin_unlock_irq(&irq_controller_lock);
return irq_found;
}
EXPORT_SYMBOL(probe_irq_off);
void __init init_irq_proc(void)
{
}
void __init init_IRQ(void)
{
struct irqdesc *desc;
extern void init_dma(void);
int irq;
for (irq = 0, desc = irq_desc; irq < NR_IRQS; irq++, desc++)
*desc = bad_irq_desc;
arc_init_irq();
init_dma();
}

401
arch/arm26/kernel/process.c Normal file
View File

@@ -0,0 +1,401 @@
/*
* linux/arch/arm26/kernel/process.c
*
* Copyright (C) 2003 Ian Molton - adapted for ARM26
* Copyright (C) 1996-2000 Russell King - Converted to ARM.
* Origional Copyright (C) 1995 Linus Torvalds
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <stdarg.h>
#include <linux/config.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/user.h>
#include <linux/a.out.h>
#include <linux/delay.h>
#include <linux/reboot.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/leds.h>
#include <asm/processor.h>
#include <asm/uaccess.h>
extern const char *processor_modes[];
extern void setup_mm_for_reboot(char mode);
static volatile int hlt_counter;
void disable_hlt(void)
{
hlt_counter++;
}
EXPORT_SYMBOL(disable_hlt);
void enable_hlt(void)
{
hlt_counter--;
}
EXPORT_SYMBOL(enable_hlt);
static int __init nohlt_setup(char *__unused)
{
hlt_counter = 1;
return 1;
}
static int __init hlt_setup(char *__unused)
{
hlt_counter = 0;
return 1;
}
__setup("nohlt", nohlt_setup);
__setup("hlt", hlt_setup);
/*
* This is our default idle handler. We need to disable
* interrupts here to ensure we don't miss a wakeup call.
*/
void cpu_idle(void)
{
/* endless idle loop with no priority at all */
preempt_disable();
while (1) {
while (!need_resched()) {
local_irq_disable();
if (!need_resched() && !hlt_counter)
local_irq_enable();
}
}
schedule();
}
static char reboot_mode = 'h';
int __init reboot_setup(char *str)
{
reboot_mode = str[0];
return 1;
}
__setup("reboot=", reboot_setup);
/* ARM26 cant do these but we still need to define them. */
void machine_halt(void)
{
}
void machine_power_off(void)
{
}
EXPORT_SYMBOL(machine_halt);
EXPORT_SYMBOL(machine_power_off);
void machine_restart(char * __unused)
{
/*
* Clean and disable cache, and turn off interrupts
*/
cpu_proc_fin();
/*
* Tell the mm system that we are going to reboot -
* we may need it to insert some 1:1 mappings so that
* soft boot works.
*/
setup_mm_for_reboot(reboot_mode);
/*
* copy branch instruction to reset location and call it
*/
*(unsigned long *)0 = *(unsigned long *)0x03800000;
((void(*)(void))0)();
/*
* Whoops - the architecture was unable to reboot.
* Tell the user! Should never happen...
*/
mdelay(1000);
printk("Reboot failed -- System halted\n");
while (1);
}
EXPORT_SYMBOL(machine_restart);
void show_regs(struct pt_regs * regs)
{
unsigned long flags;
flags = condition_codes(regs);
printk("pc : [<%08lx>] lr : [<%08lx>] %s\n"
"sp : %08lx ip : %08lx fp : %08lx\n",
instruction_pointer(regs),
regs->ARM_lr, print_tainted(), regs->ARM_sp,
regs->ARM_ip, regs->ARM_fp);
printk("r10: %08lx r9 : %08lx r8 : %08lx\n",
regs->ARM_r10, regs->ARM_r9,
regs->ARM_r8);
printk("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n",
regs->ARM_r7, regs->ARM_r6,
regs->ARM_r5, regs->ARM_r4);
printk("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n",
regs->ARM_r3, regs->ARM_r2,
regs->ARM_r1, regs->ARM_r0);
printk("Flags: %c%c%c%c",
flags & PSR_N_BIT ? 'N' : 'n',
flags & PSR_Z_BIT ? 'Z' : 'z',
flags & PSR_C_BIT ? 'C' : 'c',
flags & PSR_V_BIT ? 'V' : 'v');
printk(" IRQs o%s FIQs o%s Mode %s Segment %s\n",
interrupts_enabled(regs) ? "n" : "ff",
fast_interrupts_enabled(regs) ? "n" : "ff",
processor_modes[processor_mode(regs)],
get_fs() == get_ds() ? "kernel" : "user");
}
void show_fpregs(struct user_fp *regs)
{
int i;
for (i = 0; i < 8; i++) {
unsigned long *p;
char type;
p = (unsigned long *)(regs->fpregs + i);
switch (regs->ftype[i]) {
case 1: type = 'f'; break;
case 2: type = 'd'; break;
case 3: type = 'e'; break;
default: type = '?'; break;
}
if (regs->init_flag)
type = '?';
printk(" f%d(%c): %08lx %08lx %08lx%c",
i, type, p[0], p[1], p[2], i & 1 ? '\n' : ' ');
}
printk("FPSR: %08lx FPCR: %08lx\n",
(unsigned long)regs->fpsr,
(unsigned long)regs->fpcr);
}
/*
* Task structure and kernel stack allocation.
*/
static unsigned long *thread_info_head;
static unsigned int nr_thread_info;
extern unsigned long get_page_8k(int priority);
extern void free_page_8k(unsigned long page);
// FIXME - is this valid?
#define EXTRA_TASK_STRUCT 0
#define ll_alloc_task_struct() ((struct thread_info *)get_page_8k(GFP_KERNEL))
#define ll_free_task_struct(p) free_page_8k((unsigned long)(p))
//FIXME - do we use *task param below looks like we dont, which is ok?
//FIXME - if EXTRA_TASK_STRUCT is zero we can optimise the below away permanently. *IF* its supposed to be zero.
struct thread_info *alloc_thread_info(struct task_struct *task)
{
struct thread_info *thread = NULL;
if (EXTRA_TASK_STRUCT) {
unsigned long *p = thread_info_head;
if (p) {
thread_info_head = (unsigned long *)p[0];
nr_thread_info -= 1;
}
thread = (struct thread_info *)p;
}
if (!thread)
thread = ll_alloc_task_struct();
#ifdef CONFIG_MAGIC_SYSRQ
/*
* The stack must be cleared if you want SYSRQ-T to
* give sensible stack usage information
*/
if (thread) {
char *p = (char *)thread;
memzero(p+KERNEL_STACK_SIZE, KERNEL_STACK_SIZE);
}
#endif
return thread;
}
void free_thread_info(struct thread_info *thread)
{
if (EXTRA_TASK_STRUCT && nr_thread_info < EXTRA_TASK_STRUCT) {
unsigned long *p = (unsigned long *)thread;
p[0] = (unsigned long)thread_info_head;
thread_info_head = p;
nr_thread_info += 1;
} else
ll_free_task_struct(thread);
}
/*
* Free current thread data structures etc..
*/
void exit_thread(void)
{
}
void flush_thread(void)
{
struct thread_info *thread = current_thread_info();
struct task_struct *tsk = current;
memset(&tsk->thread.debug, 0, sizeof(struct debug_info));
memset(&thread->fpstate, 0, sizeof(union fp_state));
clear_used_math();
}
void release_thread(struct task_struct *dead_task)
{
}
asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
int
copy_thread(int nr, unsigned long clone_flags, unsigned long stack_start,
unsigned long unused, struct task_struct *p, struct pt_regs *regs)
{
struct thread_info *thread = p->thread_info;
struct pt_regs *childregs;
childregs = __get_user_regs(thread);
*childregs = *regs;
childregs->ARM_r0 = 0;
childregs->ARM_sp = stack_start;
memset(&thread->cpu_context, 0, sizeof(struct cpu_context_save));
thread->cpu_context.sp = (unsigned long)childregs;
thread->cpu_context.pc = (unsigned long)ret_from_fork | MODE_SVC26 | PSR_I_BIT;
return 0;
}
/*
* fill in the fpe structure for a core dump...
*/
int dump_fpu (struct pt_regs *regs, struct user_fp *fp)
{
struct thread_info *thread = current_thread_info();
int used_math = !!used_math();
if (used_math)
memcpy(fp, &thread->fpstate.soft, sizeof (*fp));
return used_math;
}
/*
* fill in the user structure for a core dump..
*/
void dump_thread(struct pt_regs * regs, struct user * dump)
{
struct task_struct *tsk = current;
dump->magic = CMAGIC;
dump->start_code = tsk->mm->start_code;
dump->start_stack = regs->ARM_sp & ~(PAGE_SIZE - 1);
dump->u_tsize = (tsk->mm->end_code - tsk->mm->start_code) >> PAGE_SHIFT;
dump->u_dsize = (tsk->mm->brk - tsk->mm->start_data + PAGE_SIZE - 1) >> PAGE_SHIFT;
dump->u_ssize = 0;
dump->u_debugreg[0] = tsk->thread.debug.bp[0].address;
dump->u_debugreg[1] = tsk->thread.debug.bp[1].address;
dump->u_debugreg[2] = tsk->thread.debug.bp[0].insn;
dump->u_debugreg[3] = tsk->thread.debug.bp[1].insn;
dump->u_debugreg[4] = tsk->thread.debug.nsaved;
if (dump->start_stack < 0x04000000)
dump->u_ssize = (0x04000000 - dump->start_stack) >> PAGE_SHIFT;
dump->regs = *regs;
dump->u_fpvalid = dump_fpu (regs, &dump->u_fp);
}
/*
* Shuffle the argument into the correct register before calling the
* thread function. r1 is the thread argument, r2 is the pointer to
* the thread function, and r3 points to the exit function.
* FIXME - make sure this is right - the older code used to zero fp
* and cause the parent to call sys_exit (do_exit in this version)
*/
extern void kernel_thread_helper(void);
asm( ".section .text\n"
" .align\n"
" .type kernel_thread_helper, #function\n"
"kernel_thread_helper:\n"
" mov r0, r1\n"
" mov lr, r3\n"
" mov pc, r2\n"
" .size kernel_thread_helper, . - kernel_thread_helper\n"
" .previous");
/*
* Create a kernel thread.
*/
pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
{
struct pt_regs regs;
memset(&regs, 0, sizeof(regs));
regs.ARM_r1 = (unsigned long)arg;
regs.ARM_r2 = (unsigned long)fn;
regs.ARM_r3 = (unsigned long)do_exit;
regs.ARM_pc = (unsigned long)kernel_thread_helper | MODE_SVC26;
return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, &regs, 0, NULL, NULL);
}
EXPORT_SYMBOL(kernel_thread);
unsigned long get_wchan(struct task_struct *p)
{
unsigned long fp, lr;
unsigned long stack_page;
int count = 0;
if (!p || p == current || p->state == TASK_RUNNING)
return 0;
stack_page = 4096 + (unsigned long)p;
fp = thread_saved_fp(p);
do {
if (fp < stack_page || fp > 4092+stack_page)
return 0;
lr = pc_pointer (((unsigned long *)fp)[-1]);
if (!in_sched_functions(lr))
return lr;
fp = *(unsigned long *) (fp - 12);
} while (count ++ < 16);
return 0;
}

744
arch/arm26/kernel/ptrace.c Normal file
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@@ -0,0 +1,744 @@
/*
* linux/arch/arm26/kernel/ptrace.c
*
* By Ross Biro 1/23/92
* edited by Linus Torvalds
* ARM modifications Copyright (C) 2000 Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/security.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/system.h>
//#include <asm/processor.h>
#include "ptrace.h"
#define REG_PC 15
#define REG_PSR 15
/*
* does not yet catch signals sent when the child dies.
* in exit.c or in signal.c.
*/
/*
* Breakpoint SWI instruction: SWI &9F0001
*/
#define BREAKINST_ARM 0xef9f0001
/*
* Get the address of the live pt_regs for the specified task.
* These are saved onto the top kernel stack when the process
* is not running.
*
* Note: if a user thread is execve'd from kernel space, the
* kernel stack will not be empty on entry to the kernel, so
* ptracing these tasks will fail.
*/
static inline struct pt_regs *
get_user_regs(struct task_struct *task)
{
return __get_user_regs(task->thread_info);
}
/*
* this routine will get a word off of the processes privileged stack.
* the offset is how far from the base addr as stored in the THREAD.
* this routine assumes that all the privileged stacks are in our
* data space.
*/
static inline long get_user_reg(struct task_struct *task, int offset)
{
return get_user_regs(task)->uregs[offset];
}
/*
* this routine will put a word on the processes privileged stack.
* the offset is how far from the base addr as stored in the THREAD.
* this routine assumes that all the privileged stacks are in our
* data space.
*/
static inline int
put_user_reg(struct task_struct *task, int offset, long data)
{
struct pt_regs newregs, *regs = get_user_regs(task);
int ret = -EINVAL;
newregs = *regs;
newregs.uregs[offset] = data;
if (valid_user_regs(&newregs)) {
regs->uregs[offset] = data;
ret = 0;
}
return ret;
}
static inline int
read_u32(struct task_struct *task, unsigned long addr, u32 *res)
{
int ret;
ret = access_process_vm(task, addr, res, sizeof(*res), 0);
return ret == sizeof(*res) ? 0 : -EIO;
}
static inline int
read_instr(struct task_struct *task, unsigned long addr, u32 *res)
{
int ret;
u32 val;
ret = access_process_vm(task, addr & ~3, &val, sizeof(val), 0);
ret = ret == sizeof(val) ? 0 : -EIO;
*res = val;
return ret;
}
/*
* Get value of register `rn' (in the instruction)
*/
static unsigned long
ptrace_getrn(struct task_struct *child, unsigned long insn)
{
unsigned int reg = (insn >> 16) & 15;
unsigned long val;
val = get_user_reg(child, reg);
if (reg == 15)
val = pc_pointer(val + 8); //FIXME - correct for arm26?
return val;
}
/*
* Get value of operand 2 (in an ALU instruction)
*/
static unsigned long
ptrace_getaluop2(struct task_struct *child, unsigned long insn)
{
unsigned long val;
int shift;
int type;
if (insn & 1 << 25) {
val = insn & 255;
shift = (insn >> 8) & 15;
type = 3;
} else {
val = get_user_reg (child, insn & 15);
if (insn & (1 << 4))
shift = (int)get_user_reg (child, (insn >> 8) & 15);
else
shift = (insn >> 7) & 31;
type = (insn >> 5) & 3;
}
switch (type) {
case 0: val <<= shift; break;
case 1: val >>= shift; break;
case 2:
val = (((signed long)val) >> shift);
break;
case 3:
val = (val >> shift) | (val << (32 - shift));
break;
}
return val;
}
/*
* Get value of operand 2 (in a LDR instruction)
*/
static unsigned long
ptrace_getldrop2(struct task_struct *child, unsigned long insn)
{
unsigned long val;
int shift;
int type;
val = get_user_reg(child, insn & 15);
shift = (insn >> 7) & 31;
type = (insn >> 5) & 3;
switch (type) {
case 0: val <<= shift; break;
case 1: val >>= shift; break;
case 2:
val = (((signed long)val) >> shift);
break;
case 3:
val = (val >> shift) | (val << (32 - shift));
break;
}
return val;
}
#define OP_MASK 0x01e00000
#define OP_AND 0x00000000
#define OP_EOR 0x00200000
#define OP_SUB 0x00400000
#define OP_RSB 0x00600000
#define OP_ADD 0x00800000
#define OP_ADC 0x00a00000
#define OP_SBC 0x00c00000
#define OP_RSC 0x00e00000
#define OP_ORR 0x01800000
#define OP_MOV 0x01a00000
#define OP_BIC 0x01c00000
#define OP_MVN 0x01e00000
static unsigned long
get_branch_address(struct task_struct *child, unsigned long pc, unsigned long insn)
{
u32 alt = 0;
switch (insn & 0x0e000000) {
case 0x00000000:
case 0x02000000: {
/*
* data processing
*/
long aluop1, aluop2, ccbit;
if ((insn & 0xf000) != 0xf000)
break;
aluop1 = ptrace_getrn(child, insn);
aluop2 = ptrace_getaluop2(child, insn);
ccbit = get_user_reg(child, REG_PSR) & PSR_C_BIT ? 1 : 0;
switch (insn & OP_MASK) {
case OP_AND: alt = aluop1 & aluop2; break;
case OP_EOR: alt = aluop1 ^ aluop2; break;
case OP_SUB: alt = aluop1 - aluop2; break;
case OP_RSB: alt = aluop2 - aluop1; break;
case OP_ADD: alt = aluop1 + aluop2; break;
case OP_ADC: alt = aluop1 + aluop2 + ccbit; break;
case OP_SBC: alt = aluop1 - aluop2 + ccbit; break;
case OP_RSC: alt = aluop2 - aluop1 + ccbit; break;
case OP_ORR: alt = aluop1 | aluop2; break;
case OP_MOV: alt = aluop2; break;
case OP_BIC: alt = aluop1 & ~aluop2; break;
case OP_MVN: alt = ~aluop2; break;
}
break;
}
case 0x04000000:
case 0x06000000:
/*
* ldr
*/
if ((insn & 0x0010f000) == 0x0010f000) {
unsigned long base;
base = ptrace_getrn(child, insn);
if (insn & 1 << 24) {
long aluop2;
if (insn & 0x02000000)
aluop2 = ptrace_getldrop2(child, insn);
else
aluop2 = insn & 0xfff;
if (insn & 1 << 23)
base += aluop2;
else
base -= aluop2;
}
if (read_u32(child, base, &alt) == 0)
alt = pc_pointer(alt);
}
break;
case 0x08000000:
/*
* ldm
*/
if ((insn & 0x00108000) == 0x00108000) {
unsigned long base;
unsigned int nr_regs;
if (insn & (1 << 23)) {
nr_regs = hweight16(insn & 65535) << 2;
if (!(insn & (1 << 24)))
nr_regs -= 4;
} else {
if (insn & (1 << 24))
nr_regs = -4;
else
nr_regs = 0;
}
base = ptrace_getrn(child, insn);
if (read_u32(child, base + nr_regs, &alt) == 0)
alt = pc_pointer(alt);
break;
}
break;
case 0x0a000000: {
/*
* bl or b
*/
signed long displ;
/* It's a branch/branch link: instead of trying to
* figure out whether the branch will be taken or not,
* we'll put a breakpoint at both locations. This is
* simpler, more reliable, and probably not a whole lot
* slower than the alternative approach of emulating the
* branch.
*/
displ = (insn & 0x00ffffff) << 8;
displ = (displ >> 6) + 8;
if (displ != 0 && displ != 4)
alt = pc + displ;
}
break;
}
return alt;
}
static int
swap_insn(struct task_struct *task, unsigned long addr,
void *old_insn, void *new_insn, int size)
{
int ret;
ret = access_process_vm(task, addr, old_insn, size, 0);
if (ret == size)
ret = access_process_vm(task, addr, new_insn, size, 1);
return ret;
}
static void
add_breakpoint(struct task_struct *task, struct debug_info *dbg, unsigned long addr)
{
int nr = dbg->nsaved;
if (nr < 2) {
u32 new_insn = BREAKINST_ARM;
int res;
res = swap_insn(task, addr, &dbg->bp[nr].insn, &new_insn, 4);
if (res == 4) {
dbg->bp[nr].address = addr;
dbg->nsaved += 1;
}
} else
printk(KERN_ERR "ptrace: too many breakpoints\n");
}
/*
* Clear one breakpoint in the user program. We copy what the hardware
* does and use bit 0 of the address to indicate whether this is a Thumb
* breakpoint or an ARM breakpoint.
*/
static void clear_breakpoint(struct task_struct *task, struct debug_entry *bp)
{
unsigned long addr = bp->address;
u32 old_insn;
int ret;
ret = swap_insn(task, addr & ~3, &old_insn,
&bp->insn, 4);
if (ret != 4 || old_insn != BREAKINST_ARM)
printk(KERN_ERR "%s:%d: corrupted ARM breakpoint at "
"0x%08lx (0x%08x)\n", task->comm, task->pid,
addr, old_insn);
}
void ptrace_set_bpt(struct task_struct *child)
{
struct pt_regs *regs;
unsigned long pc;
u32 insn;
int res;
regs = get_user_regs(child);
pc = instruction_pointer(regs);
res = read_instr(child, pc, &insn);
if (!res) {
struct debug_info *dbg = &child->thread.debug;
unsigned long alt;
dbg->nsaved = 0;
alt = get_branch_address(child, pc, insn);
if (alt)
add_breakpoint(child, dbg, alt);
/*
* Note that we ignore the result of setting the above
* breakpoint since it may fail. When it does, this is
* not so much an error, but a forewarning that we may
* be receiving a prefetch abort shortly.
*
* If we don't set this breakpoint here, then we can
* lose control of the thread during single stepping.
*/
if (!alt || predicate(insn) != PREDICATE_ALWAYS)
add_breakpoint(child, dbg, pc + 4);
}
}
/*
* Ensure no single-step breakpoint is pending. Returns non-zero
* value if child was being single-stepped.
*/
void ptrace_cancel_bpt(struct task_struct *child)
{
int i, nsaved = child->thread.debug.nsaved;
child->thread.debug.nsaved = 0;
if (nsaved > 2) {
printk("ptrace_cancel_bpt: bogus nsaved: %d!\n", nsaved);
nsaved = 2;
}
for (i = 0; i < nsaved; i++)
clear_breakpoint(child, &child->thread.debug.bp[i]);
}
/*
* Called by kernel/ptrace.c when detaching..
*
* Make sure the single step bit is not set.
*/
void ptrace_disable(struct task_struct *child)
{
child->ptrace &= ~PT_SINGLESTEP;
ptrace_cancel_bpt(child);
}
/*
* Handle hitting a breakpoint.
*/
void ptrace_break(struct task_struct *tsk, struct pt_regs *regs)
{
siginfo_t info;
/*
* The PC is always left pointing at the next instruction. Fix this.
*/
regs->ARM_pc -= 4;
if (tsk->thread.debug.nsaved == 0)
printk(KERN_ERR "ptrace: bogus breakpoint trap\n");
ptrace_cancel_bpt(tsk);
info.si_signo = SIGTRAP;
info.si_errno = 0;
info.si_code = TRAP_BRKPT;
info.si_addr = (void *)instruction_pointer(regs) - 4;
force_sig_info(SIGTRAP, &info, tsk);
}
/*
* Read the word at offset "off" into the "struct user". We
* actually access the pt_regs stored on the kernel stack.
*/
static int ptrace_read_user(struct task_struct *tsk, unsigned long off,
unsigned long *ret)
{
unsigned long tmp;
if (off & 3 || off >= sizeof(struct user))
return -EIO;
tmp = 0;
if (off < sizeof(struct pt_regs))
tmp = get_user_reg(tsk, off >> 2);
return put_user(tmp, ret);
}
/*
* Write the word at offset "off" into "struct user". We
* actually access the pt_regs stored on the kernel stack.
*/
static int ptrace_write_user(struct task_struct *tsk, unsigned long off,
unsigned long val)
{
if (off & 3 || off >= sizeof(struct user))
return -EIO;
if (off >= sizeof(struct pt_regs))
return 0;
return put_user_reg(tsk, off >> 2, val);
}
/*
* Get all user integer registers.
*/
static int ptrace_getregs(struct task_struct *tsk, void *uregs)
{
struct pt_regs *regs = get_user_regs(tsk);
return copy_to_user(uregs, regs, sizeof(struct pt_regs)) ? -EFAULT : 0;
}
/*
* Set all user integer registers.
*/
static int ptrace_setregs(struct task_struct *tsk, void *uregs)
{
struct pt_regs newregs;
int ret;
ret = -EFAULT;
if (copy_from_user(&newregs, uregs, sizeof(struct pt_regs)) == 0) {
struct pt_regs *regs = get_user_regs(tsk);
ret = -EINVAL;
if (valid_user_regs(&newregs)) {
*regs = newregs;
ret = 0;
}
}
return ret;
}
/*
* Get the child FPU state.
*/
static int ptrace_getfpregs(struct task_struct *tsk, void *ufp)
{
return copy_to_user(ufp, &tsk->thread_info->fpstate,
sizeof(struct user_fp)) ? -EFAULT : 0;
}
/*
* Set the child FPU state.
*/
static int ptrace_setfpregs(struct task_struct *tsk, void *ufp)
{
set_stopped_child_used_math(tsk);
return copy_from_user(&tsk->thread_info->fpstate, ufp,
sizeof(struct user_fp)) ? -EFAULT : 0;
}
static int do_ptrace(int request, struct task_struct *child, long addr, long data)
{
unsigned long tmp;
int ret;
switch (request) {
/*
* read word at location "addr" in the child process.
*/
case PTRACE_PEEKTEXT:
case PTRACE_PEEKDATA:
ret = access_process_vm(child, addr, &tmp,
sizeof(unsigned long), 0);
if (ret == sizeof(unsigned long))
ret = put_user(tmp, (unsigned long *) data);
else
ret = -EIO;
break;
case PTRACE_PEEKUSR:
ret = ptrace_read_user(child, addr, (unsigned long *)data);
break;
/*
* write the word at location addr.
*/
case PTRACE_POKETEXT:
case PTRACE_POKEDATA:
ret = access_process_vm(child, addr, &data,
sizeof(unsigned long), 1);
if (ret == sizeof(unsigned long))
ret = 0;
else
ret = -EIO;
break;
case PTRACE_POKEUSR:
ret = ptrace_write_user(child, addr, data);
break;
/*
* continue/restart and stop at next (return from) syscall
*/
case PTRACE_SYSCALL:
case PTRACE_CONT:
ret = -EIO;
if ((unsigned long) data > _NSIG)
break;
if (request == PTRACE_SYSCALL)
set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
else
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
child->exit_code = data;
/* make sure single-step breakpoint is gone. */
child->ptrace &= ~PT_SINGLESTEP;
ptrace_cancel_bpt(child);
wake_up_process(child);
ret = 0;
break;
/*
* make the child exit. Best I can do is send it a sigkill.
* perhaps it should be put in the status that it wants to
* exit.
*/
case PTRACE_KILL:
/* make sure single-step breakpoint is gone. */
child->ptrace &= ~PT_SINGLESTEP;
ptrace_cancel_bpt(child);
if (child->exit_state != EXIT_ZOMBIE) {
child->exit_code = SIGKILL;
wake_up_process(child);
}
ret = 0;
break;
/*
* execute single instruction.
*/
case PTRACE_SINGLESTEP:
ret = -EIO;
if ((unsigned long) data > _NSIG)
break;
child->ptrace |= PT_SINGLESTEP;
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
child->exit_code = data;
/* give it a chance to run. */
wake_up_process(child);
ret = 0;
break;
case PTRACE_DETACH:
ret = ptrace_detach(child, data);
break;
case PTRACE_GETREGS:
ret = ptrace_getregs(child, (void *)data);
break;
case PTRACE_SETREGS:
ret = ptrace_setregs(child, (void *)data);
break;
case PTRACE_GETFPREGS:
ret = ptrace_getfpregs(child, (void *)data);
break;
case PTRACE_SETFPREGS:
ret = ptrace_setfpregs(child, (void *)data);
break;
default:
ret = ptrace_request(child, request, addr, data);
break;
}
return ret;
}
asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
{
struct task_struct *child;
int ret;
lock_kernel();
ret = -EPERM;
if (request == PTRACE_TRACEME) {
/* are we already being traced? */
if (current->ptrace & PT_PTRACED)
goto out;
ret = security_ptrace(current->parent, current);
if (ret)
goto out;
/* set the ptrace bit in the process flags. */
current->ptrace |= PT_PTRACED;
ret = 0;
goto out;
}
ret = -ESRCH;
read_lock(&tasklist_lock);
child = find_task_by_pid(pid);
if (child)
get_task_struct(child);
read_unlock(&tasklist_lock);
if (!child)
goto out;
ret = -EPERM;
if (pid == 1) /* you may not mess with init */
goto out_tsk;
if (request == PTRACE_ATTACH) {
ret = ptrace_attach(child);
goto out_tsk;
}
ret = ptrace_check_attach(child, request == PTRACE_KILL);
if (ret == 0)
ret = do_ptrace(request, child, addr, data);
out_tsk:
put_task_struct(child);
out:
unlock_kernel();
return ret;
}
asmlinkage void syscall_trace(int why, struct pt_regs *regs)
{
unsigned long ip;
if (!test_thread_flag(TIF_SYSCALL_TRACE))
return;
if (!(current->ptrace & PT_PTRACED))
return;
/*
* Save IP. IP is used to denote syscall entry/exit:
* IP = 0 -> entry, = 1 -> exit
*/
ip = regs->ARM_ip;
regs->ARM_ip = why;
/* the 0x80 provides a way for the tracing parent to distinguish
between a syscall stop and SIGTRAP delivery */
ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
? 0x80 : 0));
/*
* this isn't the same as continuing with a signal, but it will do
* for normal use. strace only continues with a signal if the
* stopping signal is not SIGTRAP. -brl
*/
if (current->exit_code) {
send_sig(current->exit_code, current, 1);
current->exit_code = 0;
}
regs->ARM_ip = ip;
}

13
arch/arm26/kernel/ptrace.h Normal file
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@@ -0,0 +1,13 @@
/*
* linux/arch/arm26/kernel/ptrace.h
*
* Copyright (C) 2000-2003 Russell King
* Copyright (C) 2003 Ian Molton
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
extern void ptrace_cancel_bpt(struct task_struct *);
extern void ptrace_set_bpt(struct task_struct *);
extern void ptrace_break(struct task_struct *, struct pt_regs *);

223
arch/arm26/kernel/semaphore.c Normal file
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@@ -0,0 +1,223 @@
/*
* ARM semaphore implementation, taken from
*
* i386 semaphore implementation.
*
* (C) Copyright 1999 Linus Torvalds
* (C) Copyright 2003 Ian Molton (ARM26 mods)
*
* Modified for ARM by Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/config.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <asm/semaphore.h>
/*
* Semaphores are implemented using a two-way counter:
* The "count" variable is decremented for each process
* that tries to acquire the semaphore, while the "sleeping"
* variable is a count of such acquires.
*
* Notably, the inline "up()" and "down()" functions can
* efficiently test if they need to do any extra work (up
* needs to do something only if count was negative before
* the increment operation.
*
* "sleeping" and the contention routine ordering is
* protected by the semaphore spinlock.
*
* Note that these functions are only called when there is
* contention on the lock, and as such all this is the
* "non-critical" part of the whole semaphore business. The
* critical part is the inline stuff in <asm/semaphore.h>
* where we want to avoid any extra jumps and calls.
*/
/*
* Logic:
* - only on a boundary condition do we need to care. When we go
* from a negative count to a non-negative, we wake people up.
* - when we go from a non-negative count to a negative do we
* (a) synchronize with the "sleeper" count and (b) make sure
* that we're on the wakeup list before we synchronize so that
* we cannot lose wakeup events.
*/
void __up(struct semaphore *sem)
{
wake_up(&sem->wait);
}
static DEFINE_SPINLOCK(semaphore_lock);
void __sched __down(struct semaphore * sem)
{
struct task_struct *tsk = current;
DECLARE_WAITQUEUE(wait, tsk);
tsk->state = TASK_UNINTERRUPTIBLE;
add_wait_queue_exclusive(&sem->wait, &wait);
spin_lock_irq(&semaphore_lock);
sem->sleepers++;
for (;;) {
int sleepers = sem->sleepers;
/*
* Add "everybody else" into it. They aren't
* playing, because we own the spinlock.
*/
if (!atomic_add_negative(sleepers - 1, &sem->count)) {
sem->sleepers = 0;
break;
}
sem->sleepers = 1; /* us - see -1 above */
spin_unlock_irq(&semaphore_lock);
schedule();
tsk->state = TASK_UNINTERRUPTIBLE;
spin_lock_irq(&semaphore_lock);
}
spin_unlock_irq(&semaphore_lock);
remove_wait_queue(&sem->wait, &wait);
tsk->state = TASK_RUNNING;
wake_up(&sem->wait);
}
int __sched __down_interruptible(struct semaphore * sem)
{
int retval = 0;
struct task_struct *tsk = current;
DECLARE_WAITQUEUE(wait, tsk);
tsk->state = TASK_INTERRUPTIBLE;
add_wait_queue_exclusive(&sem->wait, &wait);
spin_lock_irq(&semaphore_lock);
sem->sleepers ++;
for (;;) {
int sleepers = sem->sleepers;
/*
* With signals pending, this turns into
* the trylock failure case - we won't be
* sleeping, and we* can't get the lock as
* it has contention. Just correct the count
* and exit.
*/
if (signal_pending(current)) {
retval = -EINTR;
sem->sleepers = 0;
atomic_add(sleepers, &sem->count);
break;
}
/*
* Add "everybody else" into it. They aren't
* playing, because we own the spinlock. The
* "-1" is because we're still hoping to get
* the lock.
*/
if (!atomic_add_negative(sleepers - 1, &sem->count)) {
sem->sleepers = 0;
break;
}
sem->sleepers = 1; /* us - see -1 above */
spin_unlock_irq(&semaphore_lock);
schedule();
tsk->state = TASK_INTERRUPTIBLE;
spin_lock_irq(&semaphore_lock);
}
spin_unlock_irq(&semaphore_lock);
tsk->state = TASK_RUNNING;
remove_wait_queue(&sem->wait, &wait);
wake_up(&sem->wait);
return retval;
}
/*
* Trylock failed - make sure we correct for
* having decremented the count.
*
* We could have done the trylock with a
* single "cmpxchg" without failure cases,
* but then it wouldn't work on a 386.
*/
int __down_trylock(struct semaphore * sem)
{
int sleepers;
unsigned long flags;
spin_lock_irqsave(&semaphore_lock, flags);
sleepers = sem->sleepers + 1;
sem->sleepers = 0;
/*
* Add "everybody else" and us into it. They aren't
* playing, because we own the spinlock.
*/
if (!atomic_add_negative(sleepers, &sem->count))
wake_up(&sem->wait);
spin_unlock_irqrestore(&semaphore_lock, flags);
return 1;
}
/*
* The semaphore operations have a special calling sequence that
* allow us to do a simpler in-line version of them. These routines
* need to convert that sequence back into the C sequence when
* there is contention on the semaphore.
*
* ip contains the semaphore pointer on entry. Save the C-clobbered
* registers (r0 to r3 and lr), but not ip, as we use it as a return
* value in some cases..
*/
asm(" .section .sched.text , #alloc, #execinstr \n\
.align 5 \n\
.globl __down_failed \n\
__down_failed: \n\
stmfd sp!, {r0 - r3, lr} \n\
mov r0, ip \n\
bl __down \n\
ldmfd sp!, {r0 - r3, pc}^ \n\
\n\
.align 5 \n\
.globl __down_interruptible_failed \n\
__down_interruptible_failed: \n\
stmfd sp!, {r0 - r3, lr} \n\
mov r0, ip \n\
bl __down_interruptible \n\
mov ip, r0 \n\
ldmfd sp!, {r0 - r3, pc}^ \n\
\n\
.align 5 \n\
.globl __down_trylock_failed \n\
__down_trylock_failed: \n\
stmfd sp!, {r0 - r3, lr} \n\
mov r0, ip \n\
bl __down_trylock \n\
mov ip, r0 \n\
ldmfd sp!, {r0 - r3, pc}^ \n\
\n\
.align 5 \n\
.globl __up_wakeup \n\
__up_wakeup: \n\
stmfd sp!, {r0 - r3, lr} \n\
mov r0, ip \n\
bl __up \n\
ldmfd sp!, {r0 - r3, pc}^ \n\
");
EXPORT_SYMBOL(__down_failed);
EXPORT_SYMBOL(__down_interruptible_failed);
EXPORT_SYMBOL(__down_trylock_failed);
EXPORT_SYMBOL(__up_wakeup);

573
arch/arm26/kernel/setup.c Normal file
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/*
* linux/arch/arm26/kernel/setup.c
*
* Copyright (C) 1995-2001 Russell King
* Copyright (C) 2003 Ian Molton
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/stddef.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/utsname.h>
#include <linux/blkdev.h>
#include <linux/console.h>
#include <linux/bootmem.h>
#include <linux/seq_file.h>
#include <linux/tty.h>
#include <linux/init.h>
#include <linux/root_dev.h>
#include <asm/elf.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/procinfo.h>
#include <asm/setup.h>
#include <asm/mach-types.h>
#include <asm/tlbflush.h>
#include <asm/irqchip.h>
#ifndef MEM_SIZE
#define MEM_SIZE (16*1024*1024)
#endif
#ifdef CONFIG_PREEMPT
DEFINE_SPINLOCK(kernel_flag);
#endif
#if defined(CONFIG_FPE_NWFPE)
char fpe_type[8];
static int __init fpe_setup(char *line)
{
memcpy(fpe_type, line, 8);
return 1;
}
__setup("fpe=", fpe_setup);
#endif
extern void paging_init(struct meminfo *);
extern void convert_to_tag_list(struct tag *tags);
extern void squash_mem_tags(struct tag *tag);
extern void bootmem_init(struct meminfo *);
extern int root_mountflags;
extern int _stext, _text, _etext, _edata, _end;
#ifdef CONFIG_XIP_KERNEL
extern int _endtext, _sdata;
#endif
unsigned int processor_id;
unsigned int __machine_arch_type;
unsigned int system_rev;
unsigned int system_serial_low;
unsigned int system_serial_high;
unsigned int elf_hwcap;
unsigned int memc_ctrl_reg;
unsigned int number_mfm_drives;
struct processor processor;
char elf_platform[ELF_PLATFORM_SIZE];
unsigned long phys_initrd_start __initdata = 0;
unsigned long phys_initrd_size __initdata = 0;
static struct meminfo meminfo __initdata = { 0, };
static struct proc_info_item proc_info;
static const char *machine_name;
static char command_line[COMMAND_LINE_SIZE];
static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
/*
* Standard memory resources
*/
static struct resource mem_res[] = {
{ "Video RAM", 0, 0, IORESOURCE_MEM },
{ "Kernel code", 0, 0, IORESOURCE_MEM },
{ "Kernel data", 0, 0, IORESOURCE_MEM }
};
#define video_ram mem_res[0]
#define kernel_code mem_res[1]
#define kernel_data mem_res[2]
static struct resource io_res[] = {
{ "reserved", 0x3bc, 0x3be, IORESOURCE_IO | IORESOURCE_BUSY },
{ "reserved", 0x378, 0x37f, IORESOURCE_IO | IORESOURCE_BUSY },
{ "reserved", 0x278, 0x27f, IORESOURCE_IO | IORESOURCE_BUSY }
};
#define lp0 io_res[0]
#define lp1 io_res[1]
#define lp2 io_res[2]
#define dump_cpu_info() do { } while (0)
static void __init setup_processor(void)
{
extern struct proc_info_list __proc_info_begin, __proc_info_end;
struct proc_info_list *list;
/*
* locate processor in the list of supported processor
* types. The linker builds this table for us from the
* entries in arch/arm26/mm/proc-*.S
*/
for (list = &__proc_info_begin; list < &__proc_info_end ; list++)
if ((processor_id & list->cpu_mask) == list->cpu_val)
break;
/*
* If processor type is unrecognised, then we
* can do nothing...
*/
if (list >= &__proc_info_end) {
printk("CPU configuration botched (ID %08x), unable "
"to continue.\n", processor_id);
while (1);
}
proc_info = *list->info;
processor = *list->proc;
printk("CPU: %s %s revision %d\n",
proc_info.manufacturer, proc_info.cpu_name,
(int)processor_id & 15);
dump_cpu_info();
sprintf(system_utsname.machine, "%s", list->arch_name);
sprintf(elf_platform, "%s", list->elf_name);
elf_hwcap = list->elf_hwcap;
cpu_proc_init();
}
/*
* Initial parsing of the command line. We need to pick out the
* memory size. We look for mem=size@start, where start and size
* are "size[KkMm]"
*/
static void __init
parse_cmdline(struct meminfo *mi, char **cmdline_p, char *from)
{
char c = ' ', *to = command_line;
int usermem = 0, len = 0;
for (;;) {
if (c == ' ' && !memcmp(from, "mem=", 4)) {
unsigned long size, start;
if (to != command_line)
to -= 1;
/*
* If the user specifies memory size, we
* blow away any automatically generated
* size.
*/
if (usermem == 0) {
usermem = 1;
mi->nr_banks = 0;
}
start = PHYS_OFFSET;
size = memparse(from + 4, &from);
if (*from == '@')
start = memparse(from + 1, &from);
mi->bank[mi->nr_banks].start = start;
mi->bank[mi->nr_banks].size = size;
mi->bank[mi->nr_banks].node = PHYS_TO_NID(start);
mi->nr_banks += 1;
}
c = *from++;
if (!c)
break;
if (COMMAND_LINE_SIZE <= ++len)
break;
*to++ = c;
}
*to = '\0';
*cmdline_p = command_line;
}
static void __init
setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
{
#ifdef CONFIG_BLK_DEV_RAM
extern int rd_size, rd_image_start, rd_prompt, rd_doload;
rd_image_start = image_start;
rd_prompt = prompt;
rd_doload = doload;
if (rd_sz)
rd_size = rd_sz;
#endif
}
static void __init
request_standard_resources(struct meminfo *mi)
{
struct resource *res;
int i;
kernel_code.start = init_mm.start_code;
kernel_code.end = init_mm.end_code - 1;
#ifdef CONFIG_XIP_KERNEL
kernel_data.start = init_mm.start_data;
#else
kernel_data.start = init_mm.end_code;
#endif
kernel_data.end = init_mm.brk - 1;
for (i = 0; i < mi->nr_banks; i++) {
unsigned long virt_start, virt_end;
if (mi->bank[i].size == 0)
continue;
virt_start = mi->bank[i].start;
virt_end = virt_start + mi->bank[i].size - 1;
res = alloc_bootmem_low(sizeof(*res));
res->name = "System RAM";
res->start = virt_start;
res->end = virt_end;
res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
request_resource(&iomem_resource, res);
if (kernel_code.start >= res->start &&
kernel_code.end <= res->end)
request_resource(res, &kernel_code);
if (kernel_data.start >= res->start &&
kernel_data.end <= res->end)
request_resource(res, &kernel_data);
}
/* FIXME - needed? if (mdesc->video_start) {
video_ram.start = mdesc->video_start;
video_ram.end = mdesc->video_end;
request_resource(&iomem_resource, &video_ram);
}*/
/*
* Some machines don't have the possibility of ever
* possessing lp1 or lp2
*/
if (0) /* FIXME - need to do this for A5k at least */
request_resource(&ioport_resource, &lp0);
}
/*
* Tag parsing.
*
* This is the new way of passing data to the kernel at boot time. Rather
* than passing a fixed inflexible structure to the kernel, we pass a list
* of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
* tag for the list to be recognised (to distinguish the tagged list from
* a param_struct). The list is terminated with a zero-length tag (this tag
* is not parsed in any way).
*/
static int __init parse_tag_core(const struct tag *tag)
{
if (tag->hdr.size > 2) {
if ((tag->u.core.flags & 1) == 0)
root_mountflags &= ~MS_RDONLY;
ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
}
return 0;
}
__tagtable(ATAG_CORE, parse_tag_core);
static int __init parse_tag_mem32(const struct tag *tag)
{
if (meminfo.nr_banks >= NR_BANKS) {
printk(KERN_WARNING
"Ignoring memory bank 0x%08x size %dKB\n",
tag->u.mem.start, tag->u.mem.size / 1024);
return -EINVAL;
}
meminfo.bank[meminfo.nr_banks].start = tag->u.mem.start;
meminfo.bank[meminfo.nr_banks].size = tag->u.mem.size;
meminfo.bank[meminfo.nr_banks].node = PHYS_TO_NID(tag->u.mem.start);
meminfo.nr_banks += 1;
return 0;
}
__tagtable(ATAG_MEM, parse_tag_mem32);
#if defined(CONFIG_DUMMY_CONSOLE)
struct screen_info screen_info = {
.orig_video_lines = 30,
.orig_video_cols = 80,
.orig_video_mode = 0,
.orig_video_ega_bx = 0,
.orig_video_isVGA = 1,
.orig_video_points = 8
};
static int __init parse_tag_videotext(const struct tag *tag)
{
screen_info.orig_x = tag->u.videotext.x;
screen_info.orig_y = tag->u.videotext.y;
screen_info.orig_video_page = tag->u.videotext.video_page;
screen_info.orig_video_mode = tag->u.videotext.video_mode;
screen_info.orig_video_cols = tag->u.videotext.video_cols;
screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
screen_info.orig_video_lines = tag->u.videotext.video_lines;
screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
screen_info.orig_video_points = tag->u.videotext.video_points;
return 0;
}
__tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
#endif
static int __init parse_tag_acorn(const struct tag *tag)
{
memc_ctrl_reg = tag->u.acorn.memc_control_reg;
number_mfm_drives = tag->u.acorn.adfsdrives;
return 0;
}
__tagtable(ATAG_ACORN, parse_tag_acorn);
static int __init parse_tag_ramdisk(const struct tag *tag)
{
setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
(tag->u.ramdisk.flags & 2) == 0,
tag->u.ramdisk.start, tag->u.ramdisk.size);
return 0;
}
__tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
static int __init parse_tag_initrd(const struct tag *tag)
{
printk(KERN_WARNING "ATAG_INITRD is deprecated; please update your bootloader. \n");
phys_initrd_start = (unsigned long)tag->u.initrd.start;
phys_initrd_size = (unsigned long)tag->u.initrd.size;
return 0;
}
__tagtable(ATAG_INITRD, parse_tag_initrd);
static int __init parse_tag_initrd2(const struct tag *tag)
{
printk(KERN_WARNING "ATAG_INITRD is deprecated; please update your bootloader. \n");
phys_initrd_start = (unsigned long)tag->u.initrd.start;
phys_initrd_size = (unsigned long)tag->u.initrd.size;
return 0;
}
__tagtable(ATAG_INITRD2, parse_tag_initrd2);
static int __init parse_tag_serialnr(const struct tag *tag)
{
system_serial_low = tag->u.serialnr.low;
system_serial_high = tag->u.serialnr.high;
return 0;
}
__tagtable(ATAG_SERIAL, parse_tag_serialnr);
static int __init parse_tag_revision(const struct tag *tag)
{
system_rev = tag->u.revision.rev;
return 0;
}
__tagtable(ATAG_REVISION, parse_tag_revision);
static int __init parse_tag_cmdline(const struct tag *tag)
{
strncpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
default_command_line[COMMAND_LINE_SIZE - 1] = '\0';
return 0;
}
__tagtable(ATAG_CMDLINE, parse_tag_cmdline);
/*
* Scan the tag table for this tag, and call its parse function.
* The tag table is built by the linker from all the __tagtable
* declarations.
*/
static int __init parse_tag(const struct tag *tag)
{
extern struct tagtable __tagtable_begin, __tagtable_end;
struct tagtable *t;
for (t = &__tagtable_begin; t < &__tagtable_end; t++)
if (tag->hdr.tag == t->tag) {
t->parse(tag);
break;
}
return t < &__tagtable_end;
}
/*
* Parse all tags in the list, checking both the global and architecture
* specific tag tables.
*/
static void __init parse_tags(const struct tag *t)
{
for (; t->hdr.size; t = tag_next(t))
if (!parse_tag(t))
printk(KERN_WARNING
"Ignoring unrecognised tag 0x%08x\n",
t->hdr.tag);
}
/*
* This holds our defaults.
*/
static struct init_tags {
struct tag_header hdr1;
struct tag_core core;
struct tag_header hdr2;
struct tag_mem32 mem;
struct tag_header hdr3;
} init_tags __initdata = {
{ tag_size(tag_core), ATAG_CORE },
{ 1, PAGE_SIZE, 0xff },
{ tag_size(tag_mem32), ATAG_MEM },
{ MEM_SIZE, PHYS_OFFSET },
{ 0, ATAG_NONE }
};
void __init setup_arch(char **cmdline_p)
{
struct tag *tags = (struct tag *)&init_tags;
char *from = default_command_line;
setup_processor();
if(machine_arch_type == MACH_TYPE_A5K)
machine_name = "A5000";
else if(machine_arch_type == MACH_TYPE_ARCHIMEDES)
machine_name = "Archimedes";
else
machine_name = "UNKNOWN";
//FIXME - the tag struct is always copied here but this is a block
// of RAM that is accidentally reserved along with video RAM. perhaps
// it would be a good idea to explicitly reserve this?
tags = (struct tag *)0x0207c000;
/*
* If we have the old style parameters, convert them to
* a tag list.
*/
if (tags->hdr.tag != ATAG_CORE)
convert_to_tag_list(tags);
if (tags->hdr.tag != ATAG_CORE)
tags = (struct tag *)&init_tags;
if (tags->hdr.tag == ATAG_CORE) {
if (meminfo.nr_banks != 0)
squash_mem_tags(tags);
parse_tags(tags);
}
init_mm.start_code = (unsigned long) &_text;
#ifndef CONFIG_XIP_KERNEL
init_mm.end_code = (unsigned long) &_etext;
#else
init_mm.end_code = (unsigned long) &_endtext;
init_mm.start_data = (unsigned long) &_sdata;
#endif
init_mm.end_data = (unsigned long) &_edata;
init_mm.brk = (unsigned long) &_end;
memcpy(saved_command_line, from, COMMAND_LINE_SIZE);
saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
parse_cmdline(&meminfo, cmdline_p, from);
bootmem_init(&meminfo);
paging_init(&meminfo);
request_standard_resources(&meminfo);
#ifdef CONFIG_VT
#if defined(CONFIG_DUMMY_CONSOLE)
conswitchp = &dummy_con;
#endif
#endif
}
static const char *hwcap_str[] = {
"swp",
"half",
"thumb",
"26bit",
"fastmult",
"fpa",
"vfp",
"edsp",
NULL
};
static int c_show(struct seq_file *m, void *v)
{
int i;
seq_printf(m, "Processor\t: %s %s rev %d (%s)\n",
proc_info.manufacturer, proc_info.cpu_name,
(int)processor_id & 15, elf_platform);
seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
loops_per_jiffy / (500000/HZ),
(loops_per_jiffy / (5000/HZ)) % 100);
/* dump out the processor features */
seq_puts(m, "Features\t: ");
for (i = 0; hwcap_str[i]; i++)
if (elf_hwcap & (1 << i))
seq_printf(m, "%s ", hwcap_str[i]);
seq_puts(m, "\n");
seq_printf(m, "CPU part\t\t: %07x\n", processor_id >> 4);
seq_printf(m, "CPU revision\t: %d\n\n", processor_id & 15);
seq_printf(m, "Hardware\t: %s\n", machine_name);
seq_printf(m, "Revision\t: %04x\n", system_rev);
seq_printf(m, "Serial\t\t: %08x%08x\n",
system_serial_high, system_serial_low);
return 0;
}
static void *c_start(struct seq_file *m, loff_t *pos)
{
return *pos < 1 ? (void *)1 : NULL;
}
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
++*pos;
return NULL;
}
static void c_stop(struct seq_file *m, void *v)
{
}
struct seq_operations cpuinfo_op = {
.start = c_start,
.next = c_next,
.stop = c_stop,
.show = c_show
};

540
arch/arm26/kernel/signal.c Normal file
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/*
* linux/arch/arm26/kernel/signal.c
*
* Copyright (C) 1995-2002 Russell King
* Copyright (C) 2003 Ian Molton (ARM26)
*
* FIXME!!! This is probably very broken (13/05/2003)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/config.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/wait.h>
#include <linux/ptrace.h>
#include <linux/personality.h>
#include <linux/tty.h>
#include <linux/binfmts.h>
#include <linux/elf.h>
#include <asm/pgalloc.h>
#include <asm/ucontext.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>
#include "ptrace.h"
#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
/*
* For ARM syscalls, we encode the syscall number into the instruction.
*/
#define SWI_SYS_SIGRETURN (0xef000000|(__NR_sigreturn))
#define SWI_SYS_RT_SIGRETURN (0xef000000|(__NR_rt_sigreturn))
static int do_signal(sigset_t *oldset, struct pt_regs * regs, int syscall);
/*
* atomically swap in the new signal mask, and wait for a signal.
*/
asmlinkage int sys_sigsuspend(int restart, unsigned long oldmask, old_sigset_t mask, struct pt_regs *regs)
{
sigset_t saveset;
mask &= _BLOCKABLE;
spin_lock_irq(&current->sighand->siglock);
saveset = current->blocked;
siginitset(&current->blocked, mask);
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
regs->ARM_r0 = -EINTR;
while (1) {
current->state = TASK_INTERRUPTIBLE;
schedule();
if (do_signal(&saveset, regs, 0))
return regs->ARM_r0;
}
}
asmlinkage int
sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize, struct pt_regs *regs)
{
sigset_t saveset, newset;
/* XXX: Don't preclude handling different sized sigset_t's. */
if (sigsetsize != sizeof(sigset_t))
return -EINVAL;
if (copy_from_user(&newset, unewset, sizeof(newset)))
return -EFAULT;
sigdelsetmask(&newset, ~_BLOCKABLE);
spin_lock_irq(&current->sighand->siglock);
saveset = current->blocked;
current->blocked = newset;
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
regs->ARM_r0 = -EINTR;
while (1) {
current->state = TASK_INTERRUPTIBLE;
schedule();
if (do_signal(&saveset, regs, 0))
return regs->ARM_r0;
}
}
asmlinkage int
sys_sigaction(int sig, const struct old_sigaction *act,
struct old_sigaction *oact)
{
struct k_sigaction new_ka, old_ka;
int ret;
if (act) {
old_sigset_t mask;
if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
__get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
__get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
return -EFAULT;
__get_user(new_ka.sa.sa_flags, &act->sa_flags);
__get_user(mask, &act->sa_mask);
siginitset(&new_ka.sa.sa_mask, mask);
}
ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
if (!ret && oact) {
if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
__put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
__put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
return -EFAULT;
__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
}
return ret;
}
/*
* Do a signal return; undo the signal stack.
*/
struct sigframe
{
struct sigcontext sc;
unsigned long extramask[_NSIG_WORDS-1];
unsigned long retcode;
};
struct rt_sigframe
{
struct siginfo *pinfo;
void *puc;
struct siginfo info;
struct ucontext uc;
unsigned long retcode;
};
static int
restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc)
{
int err = 0;
__get_user_error(regs->ARM_r0, &sc->arm_r0, err);
__get_user_error(regs->ARM_r1, &sc->arm_r1, err);
__get_user_error(regs->ARM_r2, &sc->arm_r2, err);
__get_user_error(regs->ARM_r3, &sc->arm_r3, err);
__get_user_error(regs->ARM_r4, &sc->arm_r4, err);
__get_user_error(regs->ARM_r5, &sc->arm_r5, err);
__get_user_error(regs->ARM_r6, &sc->arm_r6, err);
__get_user_error(regs->ARM_r7, &sc->arm_r7, err);
__get_user_error(regs->ARM_r8, &sc->arm_r8, err);
__get_user_error(regs->ARM_r9, &sc->arm_r9, err);
__get_user_error(regs->ARM_r10, &sc->arm_r10, err);
__get_user_error(regs->ARM_fp, &sc->arm_fp, err);
__get_user_error(regs->ARM_ip, &sc->arm_ip, err);
__get_user_error(regs->ARM_sp, &sc->arm_sp, err);
__get_user_error(regs->ARM_lr, &sc->arm_lr, err);
__get_user_error(regs->ARM_pc, &sc->arm_pc, err);
err |= !valid_user_regs(regs);
return err;
}
asmlinkage int sys_sigreturn(struct pt_regs *regs)
{
struct sigframe *frame;
sigset_t set;
/*
* Since we stacked the signal on a 64-bit boundary,
* then 'sp' should be word aligned here. If it's
* not, then the user is trying to mess with us.
*/
if (regs->ARM_sp & 7)
goto badframe;
frame = (struct sigframe *)regs->ARM_sp;
if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
goto badframe;
if (__get_user(set.sig[0], &frame->sc.oldmask)
|| (_NSIG_WORDS > 1
&& __copy_from_user(&set.sig[1], &frame->extramask,
sizeof(frame->extramask))))
goto badframe;
sigdelsetmask(&set, ~_BLOCKABLE);
spin_lock_irq(&current->sighand->siglock);
current->blocked = set;
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
if (restore_sigcontext(regs, &frame->sc))
goto badframe;
/* Send SIGTRAP if we're single-stepping */
if (current->ptrace & PT_SINGLESTEP) {
ptrace_cancel_bpt(current);
send_sig(SIGTRAP, current, 1);
}
return regs->ARM_r0;
badframe:
force_sig(SIGSEGV, current);
return 0;
}
asmlinkage int sys_rt_sigreturn(struct pt_regs *regs)
{
struct rt_sigframe *frame;
sigset_t set;
/*
* Since we stacked the signal on a 64-bit boundary,
* then 'sp' should be word aligned here. If it's
* not, then the user is trying to mess with us.
*/
if (regs->ARM_sp & 7)
goto badframe;
frame = (struct rt_sigframe *)regs->ARM_sp;
if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
goto badframe;
if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
goto badframe;
sigdelsetmask(&set, ~_BLOCKABLE);
spin_lock_irq(&current->sighand->siglock);
current->blocked = set;
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
goto badframe;
/* Send SIGTRAP if we're single-stepping */
if (current->ptrace & PT_SINGLESTEP) {
ptrace_cancel_bpt(current);
send_sig(SIGTRAP, current, 1);
}
return regs->ARM_r0;
badframe:
force_sig(SIGSEGV, current);
return 0;
}
static int
setup_sigcontext(struct sigcontext *sc, /*struct _fpstate *fpstate,*/
struct pt_regs *regs, unsigned long mask)
{
int err = 0;
__put_user_error(regs->ARM_r0, &sc->arm_r0, err);
__put_user_error(regs->ARM_r1, &sc->arm_r1, err);
__put_user_error(regs->ARM_r2, &sc->arm_r2, err);
__put_user_error(regs->ARM_r3, &sc->arm_r3, err);
__put_user_error(regs->ARM_r4, &sc->arm_r4, err);
__put_user_error(regs->ARM_r5, &sc->arm_r5, err);
__put_user_error(regs->ARM_r6, &sc->arm_r6, err);
__put_user_error(regs->ARM_r7, &sc->arm_r7, err);
__put_user_error(regs->ARM_r8, &sc->arm_r8, err);
__put_user_error(regs->ARM_r9, &sc->arm_r9, err);
__put_user_error(regs->ARM_r10, &sc->arm_r10, err);
__put_user_error(regs->ARM_fp, &sc->arm_fp, err);
__put_user_error(regs->ARM_ip, &sc->arm_ip, err);
__put_user_error(regs->ARM_sp, &sc->arm_sp, err);
__put_user_error(regs->ARM_lr, &sc->arm_lr, err);
__put_user_error(regs->ARM_pc, &sc->arm_pc, err);
__put_user_error(current->thread.trap_no, &sc->trap_no, err);
__put_user_error(current->thread.error_code, &sc->error_code, err);
__put_user_error(current->thread.address, &sc->fault_address, err);
__put_user_error(mask, &sc->oldmask, err);
return err;
}
static inline void *
get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, int framesize)
{
unsigned long sp = regs->ARM_sp;
/*
* This is the X/Open sanctioned signal stack switching.
*/
if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp))
sp = current->sas_ss_sp + current->sas_ss_size;
/*
* ATPCS B01 mandates 8-byte alignment
*/
return (void *)((sp - framesize) & ~7);
}
static int
setup_return(struct pt_regs *regs, struct k_sigaction *ka,
unsigned long *rc, void *frame, int usig)
{
unsigned long handler = (unsigned long)ka->sa.sa_handler;
unsigned long retcode;
if (ka->sa.sa_flags & SA_RESTORER) {
retcode = (unsigned long)ka->sa.sa_restorer;
} else {
if (__put_user((ka->sa.sa_flags & SA_SIGINFO)?SWI_SYS_RT_SIGRETURN:SWI_SYS_SIGRETURN, rc))
return 1;
retcode = ((unsigned long)rc);
}
regs->ARM_r0 = usig;
regs->ARM_sp = (unsigned long)frame;
regs->ARM_lr = retcode;
regs->ARM_pc = handler & ~3;
return 0;
}
static int
setup_frame(int usig, struct k_sigaction *ka, sigset_t *set, struct pt_regs *regs)
{
struct sigframe *frame = get_sigframe(ka, regs, sizeof(*frame));
int err = 0;
if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
return 1;
err |= setup_sigcontext(&frame->sc, /*&frame->fpstate,*/ regs, set->sig[0]);
if (_NSIG_WORDS > 1) {
err |= __copy_to_user(frame->extramask, &set->sig[1],
sizeof(frame->extramask));
}
if (err == 0)
err = setup_return(regs, ka, &frame->retcode, frame, usig);
return err;
}
static int
setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info,
sigset_t *set, struct pt_regs *regs)
{
struct rt_sigframe *frame = get_sigframe(ka, regs, sizeof(*frame));
int err = 0;
if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
return 1;
__put_user_error(&frame->info, &frame->pinfo, err);
__put_user_error(&frame->uc, &frame->puc, err);
err |= copy_siginfo_to_user(&frame->info, info);
/* Clear all the bits of the ucontext we don't use. */
err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext));
err |= setup_sigcontext(&frame->uc.uc_mcontext, /*&frame->fpstate,*/
regs, set->sig[0]);
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
if (err == 0)
err = setup_return(regs, ka, &frame->retcode, frame, usig);
if (err == 0) {
/*
* For realtime signals we must also set the second and third
* arguments for the signal handler.
* -- Peter Maydell <pmaydell@chiark.greenend.org.uk> 2000-12-06
*/
regs->ARM_r1 = (unsigned long)frame->pinfo;
regs->ARM_r2 = (unsigned long)frame->puc;
}
return err;
}
static inline void restart_syscall(struct pt_regs *regs)
{
regs->ARM_r0 = regs->ARM_ORIG_r0;
regs->ARM_pc -= 4;
}
/*
* OK, we're invoking a handler
*/
static void
handle_signal(unsigned long sig, siginfo_t *info, sigset_t *oldset,
struct pt_regs * regs, int syscall)
{
struct thread_info *thread = current_thread_info();
struct task_struct *tsk = current;
struct k_sigaction *ka = &tsk->sighand->action[sig-1];
int usig = sig;
int ret;
/*
* If we were from a system call, check for system call restarting...
*/
if (syscall) {
switch (regs->ARM_r0) {
case -ERESTART_RESTARTBLOCK:
current_thread_info()->restart_block.fn =
do_no_restart_syscall;
case -ERESTARTNOHAND:
regs->ARM_r0 = -EINTR;
break;
case -ERESTARTSYS:
if (!(ka->sa.sa_flags & SA_RESTART)) {
regs->ARM_r0 = -EINTR;
break;
}
/* fallthrough */
case -ERESTARTNOINTR:
restart_syscall(regs);
}
}
/*
* translate the signal
*/
if (usig < 32 && thread->exec_domain && thread->exec_domain->signal_invmap)
usig = thread->exec_domain->signal_invmap[usig];
/*
* Set up the stack frame
*/
if (ka->sa.sa_flags & SA_SIGINFO)
ret = setup_rt_frame(usig, ka, info, oldset, regs);
else
ret = setup_frame(usig, ka, oldset, regs);
/*
* Check that the resulting registers are actually sane.
*/
ret |= !valid_user_regs(regs);
if (ret == 0) {
if (ka->sa.sa_flags & SA_ONESHOT)
ka->sa.sa_handler = SIG_DFL;
if (!(ka->sa.sa_flags & SA_NODEFER)) {
spin_lock_irq(&tsk->sighand->siglock);
sigorsets(&tsk->blocked, &tsk->blocked,
&ka->sa.sa_mask);
sigaddset(&tsk->blocked, sig);
recalc_sigpending();
spin_unlock_irq(&tsk->sighand->siglock);
}
return;
}
force_sigsegv(sig, tsk);
}
/*
* Note that 'init' is a special process: it doesn't get signals it doesn't
* want to handle. Thus you cannot kill init even with a SIGKILL even by
* mistake.
*
* Note that we go through the signals twice: once to check the signals that
* the kernel can handle, and then we build all the user-level signal handling
* stack-frames in one go after that.
*/
static int do_signal(sigset_t *oldset, struct pt_regs *regs, int syscall)
{
siginfo_t info;
int signr;
/*
* We want the common case to go fast, which
* is why we may in certain cases get here from
* kernel mode. Just return without doing anything
* if so.
*/
if (!user_mode(regs))
return 0;
if (current->ptrace & PT_SINGLESTEP)
ptrace_cancel_bpt(current);
signr = get_signal_to_deliver(&info, regs, NULL);
if (signr > 0) {
handle_signal(signr, &info, oldset, regs, syscall);
if (current->ptrace & PT_SINGLESTEP)
ptrace_set_bpt(current);
return 1;
}
/*
* No signal to deliver to the process - restart the syscall.
*/
if (syscall) {
if (regs->ARM_r0 == -ERESTART_RESTARTBLOCK) {
u32 *usp;
regs->ARM_sp -= 12;
usp = (u32 *)regs->ARM_sp;
put_user(regs->ARM_pc, &usp[0]);
/* swi __NR_restart_syscall */
put_user(0xef000000 | __NR_restart_syscall, &usp[1]);
/* ldr pc, [sp], #12 */
// FIXME!!! is #12 correct there?
put_user(0xe49df00c, &usp[2]);
regs->ARM_pc = regs->ARM_sp + 4;
}
if (regs->ARM_r0 == -ERESTARTNOHAND ||
regs->ARM_r0 == -ERESTARTSYS ||
regs->ARM_r0 == -ERESTARTNOINTR) {
restart_syscall(regs);
}
}
if (current->ptrace & PT_SINGLESTEP)
ptrace_set_bpt(current);
return 0;
}
asmlinkage void
do_notify_resume(struct pt_regs *regs, unsigned int thread_flags, int syscall)
{
if (thread_flags & _TIF_SIGPENDING)
do_signal(&current->blocked, regs, syscall);
}

324
arch/arm26/kernel/sys_arm.c Normal file
View File

@@ -0,0 +1,324 @@
/*
* linux/arch/arm26/kernel/sys_arm.c
*
* Copyright (C) People who wrote linux/arch/i386/kernel/sys_i386.c
* Copyright (C) 1995, 1996 Russell King.
* Copyright (C) 2003 Ian Molton.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This file contains various random system calls that
* have a non-standard calling sequence on the Linux/arm
* platform.
*/
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/stat.h>
#include <linux/syscalls.h>
#include <linux/mman.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/utsname.h>
#include <asm/uaccess.h>
#include <asm/ipc.h>
extern unsigned long do_mremap(unsigned long addr, unsigned long old_len,
unsigned long new_len, unsigned long flags,
unsigned long new_addr);
/*
* sys_pipe() is the normal C calling standard for creating
* a pipe. It's not the way unix traditionally does this, though.
*/
asmlinkage int sys_pipe(unsigned long * fildes)
{
int fd[2];
int error;
error = do_pipe(fd);
if (!error) {
if (copy_to_user(fildes, fd, 2*sizeof(int)))
error = -EFAULT;
}
return error;
}
/* common code for old and new mmaps */
inline long do_mmap2(
unsigned long addr, unsigned long len,
unsigned long prot, unsigned long flags,
unsigned long fd, unsigned long pgoff)
{
int error = -EINVAL;
struct file * file = NULL;
flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
/*
* If we are doing a fixed mapping, and address < PAGE_SIZE,
* then deny it.
*/
if (flags & MAP_FIXED && addr < PAGE_SIZE && vectors_base() == 0)
goto out;
error = -EBADF;
if (!(flags & MAP_ANONYMOUS)) {
file = fget(fd);
if (!file)
goto out;
}
down_write(&current->mm->mmap_sem);
error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
up_write(&current->mm->mmap_sem);
if (file)
fput(file);
out:
return error;
}
struct mmap_arg_struct {
unsigned long addr;
unsigned long len;
unsigned long prot;
unsigned long flags;
unsigned long fd;
unsigned long offset;
};
asmlinkage int old_mmap(struct mmap_arg_struct *arg)
{
int error = -EFAULT;
struct mmap_arg_struct a;
if (copy_from_user(&a, arg, sizeof(a)))
goto out;
error = -EINVAL;
if (a.offset & ~PAGE_MASK)
goto out;
error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
out:
return error;
}
asmlinkage unsigned long
sys_arm_mremap(unsigned long addr, unsigned long old_len,
unsigned long new_len, unsigned long flags,
unsigned long new_addr)
{
unsigned long ret = -EINVAL;
/*
* If we are doing a fixed mapping, and address < PAGE_SIZE,
* then deny it.
*/
if (flags & MREMAP_FIXED && new_addr < PAGE_SIZE &&
vectors_base() == 0)
goto out;
down_write(&current->mm->mmap_sem);
ret = do_mremap(addr, old_len, new_len, flags, new_addr);
up_write(&current->mm->mmap_sem);
out:
return ret;
}
/*
* Perform the select(nd, in, out, ex, tv) and mmap() system
* calls.
*/
struct sel_arg_struct {
unsigned long n;
fd_set *inp, *outp, *exp;
struct timeval *tvp;
};
asmlinkage int old_select(struct sel_arg_struct *arg)
{
struct sel_arg_struct a;
if (copy_from_user(&a, arg, sizeof(a)))
return -EFAULT;
/* sys_select() does the appropriate kernel locking */
return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
}
/*
* sys_ipc() is the de-multiplexer for the SysV IPC calls..
*
* This is really horribly ugly.
*/
asmlinkage int sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth)
{
int version, ret;
version = call >> 16; /* hack for backward compatibility */
call &= 0xffff;
switch (call) {
case SEMOP:
return sys_semop (first, (struct sembuf *)ptr, second);
case SEMGET:
return sys_semget (first, second, third);
case SEMCTL: {
union semun fourth;
if (!ptr)
return -EINVAL;
if (get_user(fourth.__pad, (void **) ptr))
return -EFAULT;
return sys_semctl (first, second, third, fourth);
}
case MSGSND:
return sys_msgsnd (first, (struct msgbuf *) ptr,
second, third);
case MSGRCV:
switch (version) {
case 0: {
struct ipc_kludge tmp;
if (!ptr)
return -EINVAL;
if (copy_from_user(&tmp,(struct ipc_kludge *) ptr,
sizeof (tmp)))
return -EFAULT;
return sys_msgrcv (first, tmp.msgp, second,
tmp.msgtyp, third);
}
default:
return sys_msgrcv (first,
(struct msgbuf *) ptr,
second, fifth, third);
}
case MSGGET:
return sys_msgget ((key_t) first, second);
case MSGCTL:
return sys_msgctl (first, second, (struct msqid_ds *) ptr);
case SHMAT:
switch (version) {
default: {
ulong raddr;
ret = do_shmat (first, (char *) ptr, second, &raddr);
if (ret)
return ret;
return put_user (raddr, (ulong *) third);
}
case 1: /* iBCS2 emulator entry point */
if (!segment_eq(get_fs(), get_ds()))
return -EINVAL;
return do_shmat (first, (char *) ptr,
second, (ulong *) third);
}
case SHMDT:
return sys_shmdt ((char *)ptr);
case SHMGET:
return sys_shmget (first, second, third);
case SHMCTL:
return sys_shmctl (first, second,
(struct shmid_ds *) ptr);
default:
return -EINVAL;
}
}
/* Fork a new task - this creates a new program thread.
* This is called indirectly via a small wrapper
*/
asmlinkage int sys_fork(struct pt_regs *regs)
{
return do_fork(SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
}
/* Clone a task - this clones the calling program thread.
* This is called indirectly via a small wrapper
*/
asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, struct pt_regs *regs)
{
/*
* We don't support SETTID / CLEARTID (FIXME!!! (nicked from arm32))
*/
if (clone_flags & (CLONE_PARENT_SETTID | CLONE_CHILD_CLEARTID))
return -EINVAL;
if (!newsp)
newsp = regs->ARM_sp;
return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
}
asmlinkage int sys_vfork(struct pt_regs *regs)
{
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
}
/* sys_execve() executes a new program.
* This is called indirectly via a small wrapper
*/
asmlinkage int sys_execve(char *filenamei, char **argv, char **envp, struct pt_regs *regs)
{
int error;
char * filename;
filename = getname(filenamei);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename, argv, envp, regs);
putname(filename);
out:
return error;
}
/* FIXME - see if this is correct for arm26 */
long execve(const char *filename, char **argv, char **envp)
{
struct pt_regs regs;
int ret;
memset(&regs, 0, sizeof(struct pt_regs));
ret = do_execve((char *)filename, (char __user * __user *)argv, (char __user * __user *)envp, &regs);
if (ret < 0)
goto out;
/*
* Save argc to the register structure for userspace.
*/
regs.ARM_r0 = ret;
/*
* We were successful. We won't be returning to our caller, but
* instead to user space by manipulating the kernel stack.
*/
asm( "add r0, %0, %1\n\t"
"mov r1, %2\n\t"
"mov r2, %3\n\t"
"bl memmove\n\t" /* copy regs to top of stack */
"mov r8, #0\n\t" /* not a syscall */
"mov r9, %0\n\t" /* thread structure */
"mov sp, r0\n\t" /* reposition stack pointer */
"b ret_to_user"
:
: "r" (current_thread_info()),
"Ir" (THREAD_SIZE - 8 - sizeof(regs)),
"r" (&regs),
"Ir" (sizeof(regs))
: "r0", "r1", "r2", "r3", "ip", "memory");
out:
return ret;
}
EXPORT_SYMBOL(execve);

234
arch/arm26/kernel/time.c Normal file
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/*
* linux/arch/arm26/kernel/time.c
*
* Copyright (C) 1991, 1992, 1995 Linus Torvalds
* Modifications for ARM (C) 1994-2001 Russell King
* Mods for ARM26 (C) 2003 Ian Molton
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This file contains the ARM-specific time handling details:
* reading the RTC at bootup, etc...
*
* 1994-07-02 Alan Modra
* fixed set_rtc_mmss, fixed time.year for >= 2000, new mktime
* 1998-12-20 Updated NTP code according to technical memorandum Jan '96
* "A Kernel Model for Precision Timekeeping" by Dave Mills
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/time.h>
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/timex.h>
#include <linux/errno.h>
#include <linux/profile.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/ioc.h>
u64 jiffies_64 = INITIAL_JIFFIES;
EXPORT_SYMBOL(jiffies_64);
extern unsigned long wall_jiffies;
/* this needs a better home */
DEFINE_SPINLOCK(rtc_lock);
/* change this if you have some constant time drift */
#define USECS_PER_JIFFY (1000000/HZ)
static int dummy_set_rtc(void)
{
return 0;
}
/*
* hook for setting the RTC's idea of the current time.
*/
int (*set_rtc)(void) = dummy_set_rtc;
/*
* Get time offset based on IOCs timer.
* FIXME - if this is called with interrutps off, why the shennanigans
* below ?
*/
static unsigned long gettimeoffset(void)
{
unsigned int count1, count2, status;
long offset;
ioc_writeb (0, IOC_T0LATCH);
barrier ();
count1 = ioc_readb(IOC_T0CNTL) | (ioc_readb(IOC_T0CNTH) << 8);
barrier ();
status = ioc_readb(IOC_IRQREQA);
barrier ();
ioc_writeb (0, IOC_T0LATCH);
barrier ();
count2 = ioc_readb(IOC_T0CNTL) | (ioc_readb(IOC_T0CNTH) << 8);
offset = count2;
if (count2 < count1) {
/*
* We have not had an interrupt between reading count1
* and count2.
*/
if (status & (1 << 5))
offset -= LATCH;
} else if (count2 > count1) {
/*
* We have just had another interrupt between reading
* count1 and count2.
*/
offset -= LATCH;
}
offset = (LATCH - offset) * (tick_nsec / 1000);
return (offset + LATCH/2) / LATCH;
}
/*
* Scheduler clock - returns current time in nanosec units.
*/
unsigned long long sched_clock(void)
{
return (unsigned long long)jiffies * (1000000000 / HZ);
}
static unsigned long next_rtc_update;
/*
* If we have an externally synchronized linux clock, then update
* CMOS clock accordingly every ~11 minutes. set_rtc() has to be
* called as close as possible to 500 ms before the new second
* starts.
*/
static inline void do_set_rtc(void)
{
if (time_status & STA_UNSYNC || set_rtc == NULL)
return;
//FIXME - timespec.tv_sec is a time_t not unsigned long
if (next_rtc_update &&
time_before((unsigned long)xtime.tv_sec, next_rtc_update))
return;
if (xtime.tv_nsec < 500000000 - ((unsigned) tick_nsec >> 1) &&
xtime.tv_nsec >= 500000000 + ((unsigned) tick_nsec >> 1))
return;
if (set_rtc())
/*
* rtc update failed. Try again in 60s
*/
next_rtc_update = xtime.tv_sec + 60;
else
next_rtc_update = xtime.tv_sec + 660;
}
#define do_leds()
void do_gettimeofday(struct timeval *tv)
{
unsigned long flags;
unsigned long seq;
unsigned long usec, sec, lost;
do {
seq = read_seqbegin_irqsave(&xtime_lock, flags);
usec = gettimeoffset();
lost = jiffies - wall_jiffies;
if (lost)
usec += lost * USECS_PER_JIFFY;
sec = xtime.tv_sec;
usec += xtime.tv_nsec / 1000;
} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
/* usec may have gone up a lot: be safe */
while (usec >= 1000000) {
usec -= 1000000;
sec++;
}
tv->tv_sec = sec;
tv->tv_usec = usec;
}
EXPORT_SYMBOL(do_gettimeofday);
int do_settimeofday(struct timespec *tv)
{
if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
return -EINVAL;
write_seqlock_irq(&xtime_lock);
/*
* This is revolting. We need to set "xtime" correctly. However, the
* value in this location is the value at the most recent update of
* wall time. Discover what correction gettimeofday() would have
* done, and then undo it!
*/
tv->tv_nsec -= 1000 * (gettimeoffset() +
(jiffies - wall_jiffies) * USECS_PER_JIFFY);
while (tv->tv_nsec < 0) {
tv->tv_nsec += NSEC_PER_SEC;
tv->tv_sec--;
}
xtime.tv_sec = tv->tv_sec;
xtime.tv_nsec = tv->tv_nsec;
time_adjust = 0; /* stop active adjtime() */
time_status |= STA_UNSYNC;
time_maxerror = NTP_PHASE_LIMIT;
time_esterror = NTP_PHASE_LIMIT;
write_sequnlock_irq(&xtime_lock);
clock_was_set();
return 0;
}
EXPORT_SYMBOL(do_settimeofday);
static irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
do_timer(regs);
#ifndef CONFIG_SMP
update_process_times(user_mode(regs));
#endif
do_set_rtc(); //FIME - EVERY timer IRQ?
profile_tick(CPU_PROFILING, regs);
return IRQ_HANDLED; //FIXME - is this right?
}
static struct irqaction timer_irq = {
.name = "timer",
.flags = SA_INTERRUPT,
.handler = timer_interrupt,
};
extern void ioctime_init(void);
/*
* Set up timer interrupt.
*/
void __init time_init(void)
{
ioc_writeb(LATCH & 255, IOC_T0LTCHL);
ioc_writeb(LATCH >> 8, IOC_T0LTCHH);
ioc_writeb(0, IOC_T0GO);
setup_irq(IRQ_TIMER, &timer_irq);
}

548
arch/arm26/kernel/traps.c Normal file
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/*
* linux/arch/arm26/kernel/traps.c
*
* Copyright (C) 1995-2002 Russell King
* Fragments that appear the same as linux/arch/i386/kernel/traps.c (C) Linus Torvalds
* Copyright (C) 2003 Ian Molton (ARM26)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 'traps.c' handles hardware exceptions after we have saved some state in
* 'linux/arch/arm26/lib/traps.S'. Mostly a debugging aid, but will probably
* kill the offending process.
*/
#include <linux/module.h>
#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/spinlock.h>
#include <linux/personality.h>
#include <linux/ptrace.h>
#include <linux/elf.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <asm/atomic.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>
#include <asm/semaphore.h>
#include "ptrace.h"
extern void c_backtrace (unsigned long fp, int pmode);
extern void show_pte(struct mm_struct *mm, unsigned long addr);
const char *processor_modes[] = { "USER_26", "FIQ_26" , "IRQ_26" , "SVC_26" };
static const char *handler[]= { "prefetch abort", "data abort", "address exception", "interrupt" "*bad reason*"};
/*
* Stack pointers should always be within the kernels view of
* physical memory. If it is not there, then we can't dump
* out any information relating to the stack.
*/
static int verify_stack(unsigned long sp)
{
if (sp < PAGE_OFFSET || (sp > (unsigned long)high_memory && high_memory != 0))
return -EFAULT;
return 0;
}
/*
* Dump out the contents of some memory nicely...
*/
static void dump_mem(const char *str, unsigned long bottom, unsigned long top)
{
unsigned long p = bottom & ~31;
mm_segment_t fs;
int i;
/*
* We need to switch to kernel mode so that we can use __get_user
* to safely read from kernel space. Note that we now dump the
* code first, just in case the backtrace kills us.
*/
fs = get_fs();
set_fs(KERNEL_DS);
printk("%s", str);
printk("(0x%08lx to 0x%08lx)\n", bottom, top);
for (p = bottom & ~31; p < top;) {
printk("%04lx: ", p & 0xffff);
for (i = 0; i < 8; i++, p += 4) {
unsigned int val;
if (p < bottom || p >= top)
printk(" ");
else {
__get_user(val, (unsigned long *)p);
printk("%08x ", val);
}
}
printk ("\n");
}
set_fs(fs);
}
static void dump_instr(struct pt_regs *regs)
{
unsigned long addr = instruction_pointer(regs);
const int width = 8;
mm_segment_t fs;
int i;
/*
* We need to switch to kernel mode so that we can use __get_user
* to safely read from kernel space. Note that we now dump the
* code first, just in case the backtrace kills us.
*/
fs = get_fs();
set_fs(KERNEL_DS);
printk("Code: ");
for (i = -4; i < 1; i++) {
unsigned int val, bad;
bad = __get_user(val, &((u32 *)addr)[i]);
if (!bad)
printk(i == 0 ? "(%0*x) " : "%0*x ", width, val);
else {
printk("bad PC value.");
break;
}
}
printk("\n");
set_fs(fs);
}
/*static*/ void __dump_stack(struct task_struct *tsk, unsigned long sp)
{
dump_mem("Stack: ", sp, 8192+(unsigned long)tsk->thread_info);
}
void dump_stack(void)
{
#ifdef CONFIG_DEBUG_ERRORS
__backtrace();
#endif
}
EXPORT_SYMBOL(dump_stack);
//FIXME - was a static fn
void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
{
unsigned int fp;
int ok = 1;
printk("Backtrace: ");
fp = regs->ARM_fp;
if (!fp) {
printk("no frame pointer");
ok = 0;
} else if (verify_stack(fp)) {
printk("invalid frame pointer 0x%08x", fp);
ok = 0;
} else if (fp < (unsigned long)(tsk->thread_info + 1))
printk("frame pointer underflow");
printk("\n");
if (ok)
c_backtrace(fp, processor_mode(regs));
}
/* FIXME - this is probably wrong.. */
void show_stack(struct task_struct *task, unsigned long *sp) {
dump_mem("Stack: ", (unsigned long)sp, 8192+(unsigned long)task->thread_info);
}
DEFINE_SPINLOCK(die_lock);
/*
* This function is protected against re-entrancy.
*/
NORET_TYPE void die(const char *str, struct pt_regs *regs, int err)
{
struct task_struct *tsk = current;
console_verbose();
spin_lock_irq(&die_lock);
printk("Internal error: %s: %x\n", str, err);
printk("CPU: %d\n", smp_processor_id());
show_regs(regs);
printk("Process %s (pid: %d, stack limit = 0x%p)\n",
current->comm, current->pid, tsk->thread_info + 1);
if (!user_mode(regs) || in_interrupt()) {
__dump_stack(tsk, (unsigned long)(regs + 1));
dump_backtrace(regs, tsk);
dump_instr(regs);
}
while(1);
spin_unlock_irq(&die_lock);
do_exit(SIGSEGV);
}
void die_if_kernel(const char *str, struct pt_regs *regs, int err)
{
if (user_mode(regs))
return;
die(str, regs, err);
}
static DECLARE_MUTEX(undef_sem);
static int (*undef_hook)(struct pt_regs *);
int request_undef_hook(int (*fn)(struct pt_regs *))
{
int ret = -EBUSY;
down(&undef_sem);
if (undef_hook == NULL) {
undef_hook = fn;
ret = 0;
}
up(&undef_sem);
return ret;
}
int release_undef_hook(int (*fn)(struct pt_regs *))
{
int ret = -EINVAL;
down(&undef_sem);
if (undef_hook == fn) {
undef_hook = NULL;
ret = 0;
}
up(&undef_sem);
return ret;
}
static int undefined_extension(struct pt_regs *regs, unsigned int op)
{
switch (op) {
case 1: /* 0xde01 / 0x?7f001f0 */
ptrace_break(current, regs);
return 0;
}
return 1;
}
asmlinkage void do_undefinstr(struct pt_regs *regs)
{
siginfo_t info;
void *pc;
regs->ARM_pc -= 4;
pc = (unsigned long *)instruction_pointer(regs); /* strip PSR */
if (user_mode(regs)) {
u32 instr;
get_user(instr, (u32 *)pc);
if ((instr & 0x0fff00ff) == 0x07f000f0 &&
undefined_extension(regs, (instr >> 8) & 255) == 0) {
regs->ARM_pc += 4;
return;
}
} else {
if (undef_hook && undef_hook(regs) == 0) {
regs->ARM_pc += 4;
return;
}
}
#ifdef CONFIG_DEBUG_USER
printk(KERN_INFO "%s (%d): undefined instruction: pc=%p\n",
current->comm, current->pid, pc);
dump_instr(regs);
#endif
current->thread.error_code = 0;
current->thread.trap_no = 6;
info.si_signo = SIGILL;
info.si_errno = 0;
info.si_code = ILL_ILLOPC;
info.si_addr = pc;
force_sig_info(SIGILL, &info, current);
die_if_kernel("Oops - undefined instruction", regs, 0);
}
asmlinkage void do_excpt(unsigned long address, struct pt_regs *regs, int mode)
{
siginfo_t info;
#ifdef CONFIG_DEBUG_USER
printk(KERN_INFO "%s (%d): address exception: pc=%08lx\n",
current->comm, current->pid, instruction_pointer(regs));
dump_instr(regs);
#endif
current->thread.error_code = 0;
current->thread.trap_no = 11;
info.si_signo = SIGBUS;
info.si_errno = 0;
info.si_code = BUS_ADRERR;
info.si_addr = (void *)address;
force_sig_info(SIGBUS, &info, current);
die_if_kernel("Oops - address exception", regs, mode);
}
asmlinkage void do_unexp_fiq (struct pt_regs *regs)
{
#ifndef CONFIG_IGNORE_FIQ
printk("Hmm. Unexpected FIQ received, but trying to continue\n");
printk("You may have a hardware problem...\n");
#endif
}
/*
* bad_mode handles the impossible case in the vectors. If you see one of
* these, then it's extremely serious, and could mean you have buggy hardware.
* It never returns, and never tries to sync. We hope that we can at least
* dump out some state information...
*/
asmlinkage void bad_mode(struct pt_regs *regs, int reason, int proc_mode)
{
unsigned int vectors = vectors_base();
console_verbose();
printk(KERN_CRIT "Bad mode in %s handler detected: mode %s\n",
handler[reason<5?reason:4], processor_modes[proc_mode]);
/*
* Dump out the vectors and stub routines. Maybe a better solution
* would be to dump them out only if we detect that they are corrupted.
*/
dump_mem(KERN_CRIT "Vectors: ", vectors, vectors + 0x40);
dump_mem(KERN_CRIT "Stubs: ", vectors + 0x200, vectors + 0x4b8);
die("Oops", regs, 0);
local_irq_disable();
panic("bad mode");
}
static int bad_syscall(int n, struct pt_regs *regs)
{
struct thread_info *thread = current_thread_info();
siginfo_t info;
if (current->personality != PER_LINUX && thread->exec_domain->handler) {
thread->exec_domain->handler(n, regs);
return regs->ARM_r0;
}
#ifdef CONFIG_DEBUG_USER
printk(KERN_ERR "[%d] %s: obsolete system call %08x.\n",
current->pid, current->comm, n);
dump_instr(regs);
#endif
info.si_signo = SIGILL;
info.si_errno = 0;
info.si_code = ILL_ILLTRP;
info.si_addr = (void *)instruction_pointer(regs) - 4;
force_sig_info(SIGILL, &info, current);
die_if_kernel("Oops", regs, n);
return regs->ARM_r0;
}
static inline void
do_cache_op(unsigned long start, unsigned long end, int flags)
{
struct vm_area_struct *vma;
if (end < start)
return;
vma = find_vma(current->active_mm, start);
if (vma && vma->vm_start < end) {
if (start < vma->vm_start)
start = vma->vm_start;
if (end > vma->vm_end)
end = vma->vm_end;
}
}
/*
* Handle all unrecognised system calls.
* 0x9f0000 - 0x9fffff are some more esoteric system calls
*/
#define NR(x) ((__ARM_NR_##x) - __ARM_NR_BASE)
asmlinkage int arm_syscall(int no, struct pt_regs *regs)
{
siginfo_t info;
if ((no >> 16) != 0x9f)
return bad_syscall(no, regs);
switch (no & 0xffff) {
case 0: /* branch through 0 */
info.si_signo = SIGSEGV;
info.si_errno = 0;
info.si_code = SEGV_MAPERR;
info.si_addr = NULL;
force_sig_info(SIGSEGV, &info, current);
die_if_kernel("branch through zero", regs, 0);
return 0;
case NR(breakpoint): /* SWI BREAK_POINT */
ptrace_break(current, regs);
return regs->ARM_r0;
case NR(cacheflush):
return 0;
case NR(usr26):
break;
default:
/* Calls 9f00xx..9f07ff are defined to return -ENOSYS
if not implemented, rather than raising SIGILL. This
way the calling program can gracefully determine whether
a feature is supported. */
if (no <= 0x7ff)
return -ENOSYS;
break;
}
#ifdef CONFIG_DEBUG_USER
/*
* experience shows that these seem to indicate that
* something catastrophic has happened
*/
printk("[%d] %s: arm syscall %d\n", current->pid, current->comm, no);
dump_instr(regs);
if (user_mode(regs)) {
show_regs(regs);
c_backtrace(regs->ARM_fp, processor_mode(regs));
}
#endif
info.si_signo = SIGILL;
info.si_errno = 0;
info.si_code = ILL_ILLTRP;
info.si_addr = (void *)instruction_pointer(regs) - 4;
force_sig_info(SIGILL, &info, current);
die_if_kernel("Oops", regs, no);
return 0;
}
void __bad_xchg(volatile void *ptr, int size)
{
printk("xchg: bad data size: pc 0x%p, ptr 0x%p, size %d\n",
__builtin_return_address(0), ptr, size);
BUG();
}
/*
* A data abort trap was taken, but we did not handle the instruction.
* Try to abort the user program, or panic if it was the kernel.
*/
asmlinkage void
baddataabort(int code, unsigned long instr, struct pt_regs *regs)
{
unsigned long addr = instruction_pointer(regs);
siginfo_t info;
#ifdef CONFIG_DEBUG_USER
printk(KERN_ERR "[%d] %s: bad data abort: code %d instr 0x%08lx\n",
current->pid, current->comm, code, instr);
dump_instr(regs);
show_pte(current->mm, addr);
#endif
info.si_signo = SIGILL;
info.si_errno = 0;
info.si_code = ILL_ILLOPC;
info.si_addr = (void *)addr;
force_sig_info(SIGILL, &info, current);
die_if_kernel("unknown data abort code", regs, instr);
}
volatile void __bug(const char *file, int line, void *data)
{
printk(KERN_CRIT"kernel BUG at %s:%d!", file, line);
if (data)
printk(KERN_CRIT" - extra data = %p", data);
printk("\n");
*(int *)0 = 0;
}
void __readwrite_bug(const char *fn)
{
printk("%s called, but not implemented", fn);
BUG();
}
void __pte_error(const char *file, int line, unsigned long val)
{
printk("%s:%d: bad pte %08lx.\n", file, line, val);
}
void __pmd_error(const char *file, int line, unsigned long val)
{
printk("%s:%d: bad pmd %08lx.\n", file, line, val);
}
void __pgd_error(const char *file, int line, unsigned long val)
{
printk("%s:%d: bad pgd %08lx.\n", file, line, val);
}
asmlinkage void __div0(void)
{
printk("Division by zero in kernel.\n");
dump_stack();
}
void abort(void)
{
BUG();
/* if that doesn't kill us, halt */
panic("Oops failed to kill thread");
}
void __init trap_init(void)
{
extern void __trap_init(unsigned long);
unsigned long base = vectors_base();
__trap_init(base);
if (base != 0)
printk(KERN_DEBUG "Relocating machine vectors to 0x%08lx\n",
base);
}

134
arch/arm26/kernel/vmlinux-arm26-xip.lds.in Normal file
View File

@@ -0,0 +1,134 @@
/* ld script to make ARM Linux kernel
* taken from the i386 version by Russell King
* Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
* borrowed from Russels ARM port by Ian Molton
*/
#include <asm-generic/vmlinux.lds.h>
OUTPUT_ARCH(arm)
ENTRY(stext)
jiffies = jiffies_64;
SECTIONS
{
. = TEXTADDR;
.init : { /* Init code and data */
_stext = .;
__init_begin = .;
_sinittext = .;
*(.init.text)
_einittext = .;
__proc_info_begin = .;
*(.proc.info)
__proc_info_end = .;
__arch_info_begin = .;
*(.arch.info)
__arch_info_end = .;
__tagtable_begin = .;
*(.taglist)
__tagtable_end = .;
. = ALIGN(16);
__setup_start = .;
*(.init.setup)
__setup_end = .;
__early_begin = .;
*(__early_param)
__early_end = .;
__initcall_start = .;
*(.initcall1.init)
*(.initcall2.init)
*(.initcall3.init)
*(.initcall4.init)
*(.initcall5.init)
*(.initcall6.init)
*(.initcall7.init)
__initcall_end = .;
__con_initcall_start = .;
*(.con_initcall.init)
__con_initcall_end = .;
. = ALIGN(32);
__initramfs_start = .;
usr/built-in.o(.init.ramfs)
__initramfs_end = .;
. = ALIGN(32768);
__init_end = .;
}
/DISCARD/ : { /* Exit code and data */
*(.exit.text)
*(.exit.data)
*(.exitcall.exit)
}
.text : { /* Real text segment */
_text = .; /* Text and read-only data */
*(.text)
SCHED_TEXT
LOCK_TEXT /* FIXME - borrowed from arm32 - check*/
*(.fixup)
*(.gnu.warning)
*(.rodata)
*(.rodata.*)
*(.glue_7)
*(.glue_7t)
*(.got) /* Global offset table */
_etext = .; /* End of text section */
}
. = ALIGN(16);
__ex_table : { /* Exception table */
__start___ex_table = .;
*(__ex_table)
__stop___ex_table = .;
}
RODATA
_endtext = .;
. = DATAADDR;
_sdata = .;
.data : {
. = ALIGN(8192);
/*
* first, the init thread union, aligned
* to an 8192 byte boundary. (see arm26/kernel/init_task.c)
* FIXME - sould this be 32K aligned on arm26?
*/
*(.init.task)
/*
* The cacheline aligned data
*/
. = ALIGN(32);
*(.data.cacheline_aligned)
/*
* and the usual data section
*/
*(.data)
CONSTRUCTORS
*(.init.data)
_edata = .;
}
.bss : {
__bss_start = .; /* BSS */
*(.bss)
*(COMMON)
_end = . ;
}
/* Stabs debugging sections. */
.stab 0 : { *(.stab) }
.stabstr 0 : { *(.stabstr) }
.stab.excl 0 : { *(.stab.excl) }
.stab.exclstr 0 : { *(.stab.exclstr) }
.stab.index 0 : { *(.stab.index) }
.stab.indexstr 0 : { *(.stab.indexstr) }
.comment 0 : { *(.comment) }
}

127
arch/arm26/kernel/vmlinux-arm26.lds.in Normal file
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/* ld script to make ARM Linux kernel
* taken from the i386 version by Russell King
* Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
* borrowed from Russels ARM port by Ian Molton and subsequently modified.
*/
#include <asm-generic/vmlinux.lds.h>
OUTPUT_ARCH(arm)
ENTRY(stext)
jiffies = jiffies_64;
SECTIONS
{
. = TEXTADDR;
.init : { /* Init code and data */
_stext = .;
__init_begin = .;
_sinittext = .;
*(.init.text)
_einittext = .;
__proc_info_begin = .;
*(.proc.info)
__proc_info_end = .;
__arch_info_begin = .;
*(.arch.info)
__arch_info_end = .;
__tagtable_begin = .;
*(.taglist)
__tagtable_end = .;
*(.init.data)
. = ALIGN(16);
__setup_start = .;
*(.init.setup)
__setup_end = .;
__early_begin = .;
*(__early_param)
__early_end = .;
__initcall_start = .;
*(.initcall1.init)
*(.initcall2.init)
*(.initcall3.init)
*(.initcall4.init)
*(.initcall5.init)
*(.initcall6.init)
*(.initcall7.init)
__initcall_end = .;
__con_initcall_start = .;
*(.con_initcall.init)
__con_initcall_end = .;
. = ALIGN(32);
__initramfs_start = .;
usr/built-in.o(.init.ramfs)
__initramfs_end = .;
. = ALIGN(32768);
__init_end = .;
}
/DISCARD/ : { /* Exit code and data */
*(.exit.text)
*(.exit.data)
*(.exitcall.exit)
}
.text : { /* Real text segment */
_text = .; /* Text and read-only data */
*(.text)
SCHED_TEXT
LOCK_TEXT
*(.fixup)
*(.gnu.warning)
*(.rodata)
*(.rodata.*)
*(.glue_7)
*(.glue_7t)
*(.got) /* Global offset table */
_etext = .; /* End of text section */
}
. = ALIGN(16);
__ex_table : { /* Exception table */
__start___ex_table = .;
*(__ex_table)
__stop___ex_table = .;
}
RODATA
. = ALIGN(8192);
.data : {
/*
* first, the init task union, aligned
* to an 8192 byte boundary. (see arm26/kernel/init_task.c)
*/
*(.init.task)
/*
* The cacheline aligned data
*/
. = ALIGN(32);
*(.data.cacheline_aligned)
/*
* and the usual data section
*/
*(.data)
CONSTRUCTORS
_edata = .;
}
.bss : {
__bss_start = .; /* BSS */
*(.bss)
*(COMMON)
_end = . ;
}
/* Stabs debugging sections. */
.stab 0 : { *(.stab) }
.stabstr 0 : { *(.stabstr) }
.stab.excl 0 : { *(.stab.excl) }
.stab.exclstr 0 : { *(.stab.exclstr) }
.stab.index 0 : { *(.stab.index) }
.stab.indexstr 0 : { *(.stab.indexstr) }
.comment 0 : { *(.comment) }
}

12
arch/arm26/kernel/vmlinux.lds.S Normal file
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#include <linux/config.h>
#ifdef CONFIG_XIP_KERNEL
#include "vmlinux-arm26-xip.lds.in"
#else
#include "vmlinux-arm26.lds.in"
#endif