Linux-2.6.12-rc2
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
405
arch/m68k/kernel/process.c
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405
arch/m68k/kernel/process.c
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@@ -0,0 +1,405 @@
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/*
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* linux/arch/m68k/kernel/process.c
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*
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* Copyright (C) 1995 Hamish Macdonald
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*
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* 68060 fixes by Jesper Skov
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*/
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/*
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* This file handles the architecture-dependent parts of process handling..
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*/
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#include <linux/config.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/smp_lock.h>
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#include <linux/stddef.h>
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#include <linux/unistd.h>
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#include <linux/ptrace.h>
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#include <linux/slab.h>
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#include <linux/user.h>
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#include <linux/a.out.h>
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#include <linux/reboot.h>
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#include <linux/init_task.h>
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#include <linux/mqueue.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <asm/traps.h>
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#include <asm/machdep.h>
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#include <asm/setup.h>
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#include <asm/pgtable.h>
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/*
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* Initial task/thread structure. Make this a per-architecture thing,
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* because different architectures tend to have different
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* alignment requirements and potentially different initial
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* setup.
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*/
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static struct fs_struct init_fs = INIT_FS;
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static struct files_struct init_files = INIT_FILES;
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static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
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static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
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struct mm_struct init_mm = INIT_MM(init_mm);
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EXPORT_SYMBOL(init_mm);
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union thread_union init_thread_union
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__attribute__((section(".data.init_task"), aligned(THREAD_SIZE)))
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= { INIT_THREAD_INFO(init_task) };
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/* initial task structure */
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struct task_struct init_task = INIT_TASK(init_task);
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EXPORT_SYMBOL(init_task);
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asmlinkage void ret_from_fork(void);
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/*
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* Return saved PC from a blocked thread
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*/
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unsigned long thread_saved_pc(struct task_struct *tsk)
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{
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struct switch_stack *sw = (struct switch_stack *)tsk->thread.ksp;
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/* Check whether the thread is blocked in resume() */
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if (in_sched_functions(sw->retpc))
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return ((unsigned long *)sw->a6)[1];
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else
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return sw->retpc;
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}
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/*
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* The idle loop on an m68k..
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*/
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void default_idle(void)
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{
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if (!need_resched())
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#if defined(MACH_ATARI_ONLY) && !defined(CONFIG_HADES)
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/* block out HSYNC on the atari (falcon) */
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__asm__("stop #0x2200" : : : "cc");
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#else
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__asm__("stop #0x2000" : : : "cc");
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#endif
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}
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void (*idle)(void) = default_idle;
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/*
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* The idle thread. There's no useful work to be
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* done, so just try to conserve power and have a
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* low exit latency (ie sit in a loop waiting for
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* somebody to say that they'd like to reschedule)
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*/
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void cpu_idle(void)
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{
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/* endless idle loop with no priority at all */
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while (1) {
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while (!need_resched())
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idle();
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schedule();
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}
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}
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void machine_restart(char * __unused)
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{
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if (mach_reset)
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mach_reset();
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for (;;);
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}
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EXPORT_SYMBOL(machine_restart);
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void machine_halt(void)
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{
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if (mach_halt)
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mach_halt();
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for (;;);
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}
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EXPORT_SYMBOL(machine_halt);
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void machine_power_off(void)
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{
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if (mach_power_off)
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mach_power_off();
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for (;;);
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}
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EXPORT_SYMBOL(machine_power_off);
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void show_regs(struct pt_regs * regs)
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{
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printk("\n");
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printk("Format %02x Vector: %04x PC: %08lx Status: %04x %s\n",
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regs->format, regs->vector, regs->pc, regs->sr, print_tainted());
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printk("ORIG_D0: %08lx D0: %08lx A2: %08lx A1: %08lx\n",
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regs->orig_d0, regs->d0, regs->a2, regs->a1);
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printk("A0: %08lx D5: %08lx D4: %08lx\n",
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regs->a0, regs->d5, regs->d4);
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printk("D3: %08lx D2: %08lx D1: %08lx\n",
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regs->d3, regs->d2, regs->d1);
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if (!(regs->sr & PS_S))
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printk("USP: %08lx\n", rdusp());
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}
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/*
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* Create a kernel thread
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*/
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int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
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{
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int pid;
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mm_segment_t fs;
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fs = get_fs();
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set_fs (KERNEL_DS);
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{
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register long retval __asm__ ("d0");
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register long clone_arg __asm__ ("d1") = flags | CLONE_VM | CLONE_UNTRACED;
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retval = __NR_clone;
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__asm__ __volatile__
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("clrl %%d2\n\t"
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"trap #0\n\t" /* Linux/m68k system call */
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"tstl %0\n\t" /* child or parent */
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"jne 1f\n\t" /* parent - jump */
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"lea %%sp@(%c7),%6\n\t" /* reload current */
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"movel %6@,%6\n\t"
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"movel %3,%%sp@-\n\t" /* push argument */
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"jsr %4@\n\t" /* call fn */
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"movel %0,%%d1\n\t" /* pass exit value */
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"movel %2,%%d0\n\t" /* exit */
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"trap #0\n"
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"1:"
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: "+d" (retval)
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: "i" (__NR_clone), "i" (__NR_exit),
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"r" (arg), "a" (fn), "d" (clone_arg), "r" (current),
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"i" (-THREAD_SIZE)
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: "d2");
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pid = retval;
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}
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set_fs (fs);
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return pid;
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}
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void flush_thread(void)
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{
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unsigned long zero = 0;
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set_fs(USER_DS);
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current->thread.fs = __USER_DS;
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if (!FPU_IS_EMU)
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asm volatile (".chip 68k/68881\n\t"
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"frestore %0@\n\t"
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".chip 68k" : : "a" (&zero));
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}
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/*
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* "m68k_fork()".. By the time we get here, the
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* non-volatile registers have also been saved on the
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* stack. We do some ugly pointer stuff here.. (see
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* also copy_thread)
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*/
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asmlinkage int m68k_fork(struct pt_regs *regs)
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{
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return do_fork(SIGCHLD, rdusp(), regs, 0, NULL, NULL);
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}
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asmlinkage int m68k_vfork(struct pt_regs *regs)
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{
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return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0,
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NULL, NULL);
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}
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asmlinkage int m68k_clone(struct pt_regs *regs)
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{
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unsigned long clone_flags;
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unsigned long newsp;
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int *parent_tidptr, *child_tidptr;
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/* syscall2 puts clone_flags in d1 and usp in d2 */
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clone_flags = regs->d1;
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newsp = regs->d2;
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parent_tidptr = (int *)regs->d3;
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child_tidptr = (int *)regs->d4;
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if (!newsp)
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newsp = rdusp();
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return do_fork(clone_flags, newsp, regs, 0,
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parent_tidptr, child_tidptr);
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}
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int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
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unsigned long unused,
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struct task_struct * p, struct pt_regs * regs)
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{
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struct pt_regs * childregs;
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struct switch_stack * childstack, *stack;
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unsigned long stack_offset, *retp;
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stack_offset = THREAD_SIZE - sizeof(struct pt_regs);
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childregs = (struct pt_regs *) ((unsigned long) (p->thread_info) + stack_offset);
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*childregs = *regs;
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childregs->d0 = 0;
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retp = ((unsigned long *) regs);
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stack = ((struct switch_stack *) retp) - 1;
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childstack = ((struct switch_stack *) childregs) - 1;
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*childstack = *stack;
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childstack->retpc = (unsigned long)ret_from_fork;
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p->thread.usp = usp;
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p->thread.ksp = (unsigned long)childstack;
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/*
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* Must save the current SFC/DFC value, NOT the value when
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* the parent was last descheduled - RGH 10-08-96
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*/
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p->thread.fs = get_fs().seg;
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if (!FPU_IS_EMU) {
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/* Copy the current fpu state */
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asm volatile ("fsave %0" : : "m" (p->thread.fpstate[0]) : "memory");
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if (!CPU_IS_060 ? p->thread.fpstate[0] : p->thread.fpstate[2])
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asm volatile ("fmovemx %/fp0-%/fp7,%0\n\t"
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"fmoveml %/fpiar/%/fpcr/%/fpsr,%1"
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: : "m" (p->thread.fp[0]), "m" (p->thread.fpcntl[0])
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: "memory");
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/* Restore the state in case the fpu was busy */
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asm volatile ("frestore %0" : : "m" (p->thread.fpstate[0]));
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}
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return 0;
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}
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/* Fill in the fpu structure for a core dump. */
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int dump_fpu (struct pt_regs *regs, struct user_m68kfp_struct *fpu)
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{
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char fpustate[216];
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if (FPU_IS_EMU) {
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int i;
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memcpy(fpu->fpcntl, current->thread.fpcntl, 12);
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memcpy(fpu->fpregs, current->thread.fp, 96);
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/* Convert internal fpu reg representation
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* into long double format
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*/
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for (i = 0; i < 24; i += 3)
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fpu->fpregs[i] = ((fpu->fpregs[i] & 0xffff0000) << 15) |
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((fpu->fpregs[i] & 0x0000ffff) << 16);
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return 1;
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}
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/* First dump the fpu context to avoid protocol violation. */
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asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
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if (!CPU_IS_060 ? !fpustate[0] : !fpustate[2])
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return 0;
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asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
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:: "m" (fpu->fpcntl[0])
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: "memory");
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asm volatile ("fmovemx %/fp0-%/fp7,%0"
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:: "m" (fpu->fpregs[0])
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: "memory");
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return 1;
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}
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/*
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* fill in the user structure for a core dump..
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*/
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void dump_thread(struct pt_regs * regs, struct user * dump)
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{
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struct switch_stack *sw;
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/* changed the size calculations - should hopefully work better. lbt */
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dump->magic = CMAGIC;
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dump->start_code = 0;
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dump->start_stack = rdusp() & ~(PAGE_SIZE - 1);
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dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
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dump->u_dsize = ((unsigned long) (current->mm->brk +
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(PAGE_SIZE-1))) >> PAGE_SHIFT;
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dump->u_dsize -= dump->u_tsize;
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dump->u_ssize = 0;
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if (dump->start_stack < TASK_SIZE)
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dump->u_ssize = ((unsigned long) (TASK_SIZE - dump->start_stack)) >> PAGE_SHIFT;
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dump->u_ar0 = (struct user_regs_struct *)((int)&dump->regs - (int)dump);
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sw = ((struct switch_stack *)regs) - 1;
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dump->regs.d1 = regs->d1;
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dump->regs.d2 = regs->d2;
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dump->regs.d3 = regs->d3;
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dump->regs.d4 = regs->d4;
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dump->regs.d5 = regs->d5;
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dump->regs.d6 = sw->d6;
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dump->regs.d7 = sw->d7;
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dump->regs.a0 = regs->a0;
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dump->regs.a1 = regs->a1;
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dump->regs.a2 = regs->a2;
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dump->regs.a3 = sw->a3;
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dump->regs.a4 = sw->a4;
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dump->regs.a5 = sw->a5;
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dump->regs.a6 = sw->a6;
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dump->regs.d0 = regs->d0;
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dump->regs.orig_d0 = regs->orig_d0;
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dump->regs.stkadj = regs->stkadj;
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dump->regs.sr = regs->sr;
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dump->regs.pc = regs->pc;
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dump->regs.fmtvec = (regs->format << 12) | regs->vector;
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/* dump floating point stuff */
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dump->u_fpvalid = dump_fpu (regs, &dump->m68kfp);
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}
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/*
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* sys_execve() executes a new program.
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*/
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asmlinkage int sys_execve(char *name, char **argv, char **envp)
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{
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int error;
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char * filename;
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struct pt_regs *regs = (struct pt_regs *) &name;
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lock_kernel();
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filename = getname(name);
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error = PTR_ERR(filename);
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if (IS_ERR(filename))
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goto out;
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error = do_execve(filename, argv, envp, regs);
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putname(filename);
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out:
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unlock_kernel();
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return error;
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}
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unsigned long get_wchan(struct task_struct *p)
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{
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unsigned long fp, pc;
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unsigned long stack_page;
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int count = 0;
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if (!p || p == current || p->state == TASK_RUNNING)
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return 0;
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stack_page = (unsigned long)(p->thread_info);
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fp = ((struct switch_stack *)p->thread.ksp)->a6;
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do {
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if (fp < stack_page+sizeof(struct thread_info) ||
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fp >= 8184+stack_page)
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return 0;
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pc = ((unsigned long *)fp)[1];
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if (!in_sched_functions(pc))
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return pc;
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fp = *(unsigned long *) fp;
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} while (count++ < 16);
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return 0;
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}
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Reference in New Issue
Block a user