sh: Move in the SH-5 ptrace impl.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt
@@ -5,7 +5,7 @@
|
||||
extra-y := head.o init_task.o vmlinux.lds
|
||||
|
||||
obj-y := debugtraps.o io.o io_generic.o irq.o machvec.o process_32.o \
|
||||
ptrace.o semaphore.o setup.o signal.o sys_sh.o syscalls.o \
|
||||
ptrace_32.o semaphore.o setup.o signal.o sys_sh.o syscalls.o \
|
||||
time.o topology.o traps.o
|
||||
|
||||
obj-y += cpu/ timers/
|
||||
|
||||
@@ -1,7 +1,7 @@
|
||||
extra-y := head.o init_task.o vmlinux.lds
|
||||
|
||||
obj-y := debugtraps.o io.o io_generic.o irq.o machvec.o process_64.o \
|
||||
ptrace.o semaphore.o setup.o signal.o sys_sh.o syscalls.o \
|
||||
ptrace_64.o semaphore.o setup.o signal.o sys_sh.o syscalls.o \
|
||||
time.o topology.o traps.o
|
||||
|
||||
obj-y += cpu/ timers/
|
||||
|
||||
332
arch/sh/kernel/ptrace_64.c
Normal file
332
arch/sh/kernel/ptrace_64.c
Normal file
@@ -0,0 +1,332 @@
|
||||
/*
|
||||
* This file is subject to the terms and conditions of the GNU General Public
|
||||
* License. See the file "COPYING" in the main directory of this archive
|
||||
* for more details.
|
||||
*
|
||||
* arch/sh64/kernel/ptrace.c
|
||||
*
|
||||
* Copyright (C) 2000, 2001 Paolo Alberelli
|
||||
* Copyright (C) 2003 Paul Mundt
|
||||
*
|
||||
* Started from SH3/4 version:
|
||||
* SuperH version: Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
|
||||
*
|
||||
* Original x86 implementation:
|
||||
* By Ross Biro 1/23/92
|
||||
* edited by Linus Torvalds
|
||||
*
|
||||
*/
|
||||
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/rwsem.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/mm.h>
|
||||
#include <linux/smp.h>
|
||||
#include <linux/smp_lock.h>
|
||||
#include <linux/errno.h>
|
||||
#include <linux/ptrace.h>
|
||||
#include <linux/user.h>
|
||||
#include <linux/signal.h>
|
||||
#include <linux/syscalls.h>
|
||||
|
||||
#include <asm/io.h>
|
||||
#include <asm/uaccess.h>
|
||||
#include <asm/pgtable.h>
|
||||
#include <asm/system.h>
|
||||
#include <asm/processor.h>
|
||||
#include <asm/mmu_context.h>
|
||||
|
||||
/* This mask defines the bits of the SR which the user is not allowed to
|
||||
change, which are everything except S, Q, M, PR, SZ, FR. */
|
||||
#define SR_MASK (0xffff8cfd)
|
||||
|
||||
/*
|
||||
* does not yet catch signals sent when the child dies.
|
||||
* in exit.c or in signal.c.
|
||||
*/
|
||||
|
||||
/*
|
||||
* This routine will get a word from the user area in the process kernel stack.
|
||||
*/
|
||||
static inline int get_stack_long(struct task_struct *task, int offset)
|
||||
{
|
||||
unsigned char *stack;
|
||||
|
||||
stack = (unsigned char *)(task->thread.uregs);
|
||||
stack += offset;
|
||||
return (*((int *)stack));
|
||||
}
|
||||
|
||||
static inline unsigned long
|
||||
get_fpu_long(struct task_struct *task, unsigned long addr)
|
||||
{
|
||||
unsigned long tmp;
|
||||
struct pt_regs *regs;
|
||||
regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1;
|
||||
|
||||
if (!tsk_used_math(task)) {
|
||||
if (addr == offsetof(struct user_fpu_struct, fpscr)) {
|
||||
tmp = FPSCR_INIT;
|
||||
} else {
|
||||
tmp = 0xffffffffUL; /* matches initial value in fpu.c */
|
||||
}
|
||||
return tmp;
|
||||
}
|
||||
|
||||
if (last_task_used_math == task) {
|
||||
grab_fpu();
|
||||
fpsave(&task->thread.fpu.hard);
|
||||
release_fpu();
|
||||
last_task_used_math = 0;
|
||||
regs->sr |= SR_FD;
|
||||
}
|
||||
|
||||
tmp = ((long *)&task->thread.fpu)[addr / sizeof(unsigned long)];
|
||||
return tmp;
|
||||
}
|
||||
|
||||
/*
|
||||
* This routine will put a word into the user area in the process kernel stack.
|
||||
*/
|
||||
static inline int put_stack_long(struct task_struct *task, int offset,
|
||||
unsigned long data)
|
||||
{
|
||||
unsigned char *stack;
|
||||
|
||||
stack = (unsigned char *)(task->thread.uregs);
|
||||
stack += offset;
|
||||
*(unsigned long *) stack = data;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline int
|
||||
put_fpu_long(struct task_struct *task, unsigned long addr, unsigned long data)
|
||||
{
|
||||
struct pt_regs *regs;
|
||||
|
||||
regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1;
|
||||
|
||||
if (!tsk_used_math(task)) {
|
||||
fpinit(&task->thread.fpu.hard);
|
||||
set_stopped_child_used_math(task);
|
||||
} else if (last_task_used_math == task) {
|
||||
grab_fpu();
|
||||
fpsave(&task->thread.fpu.hard);
|
||||
release_fpu();
|
||||
last_task_used_math = 0;
|
||||
regs->sr |= SR_FD;
|
||||
}
|
||||
|
||||
((long *)&task->thread.fpu)[addr / sizeof(unsigned long)] = data;
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
long arch_ptrace(struct task_struct *child, long request, long addr, long data)
|
||||
{
|
||||
int ret;
|
||||
|
||||
switch (request) {
|
||||
/* when I and D space are separate, these will need to be fixed. */
|
||||
case PTRACE_PEEKTEXT: /* read word at location addr. */
|
||||
case PTRACE_PEEKDATA:
|
||||
ret = generic_ptrace_peekdata(child, addr, data);
|
||||
break;
|
||||
|
||||
/* read the word at location addr in the USER area. */
|
||||
case PTRACE_PEEKUSR: {
|
||||
unsigned long tmp;
|
||||
|
||||
ret = -EIO;
|
||||
if ((addr & 3) || addr < 0)
|
||||
break;
|
||||
|
||||
if (addr < sizeof(struct pt_regs))
|
||||
tmp = get_stack_long(child, addr);
|
||||
else if ((addr >= offsetof(struct user, fpu)) &&
|
||||
(addr < offsetof(struct user, u_fpvalid))) {
|
||||
tmp = get_fpu_long(child, addr - offsetof(struct user, fpu));
|
||||
} else if (addr == offsetof(struct user, u_fpvalid)) {
|
||||
tmp = !!tsk_used_math(child);
|
||||
} else {
|
||||
break;
|
||||
}
|
||||
ret = put_user(tmp, (unsigned long *)data);
|
||||
break;
|
||||
}
|
||||
|
||||
/* when I and D space are separate, this will have to be fixed. */
|
||||
case PTRACE_POKETEXT: /* write the word at location addr. */
|
||||
case PTRACE_POKEDATA:
|
||||
ret = generic_ptrace_pokedata(child, addr, data);
|
||||
break;
|
||||
|
||||
case PTRACE_POKEUSR:
|
||||
/* write the word at location addr in the USER area. We must
|
||||
disallow any changes to certain SR bits or u_fpvalid, since
|
||||
this could crash the kernel or result in a security
|
||||
loophole. */
|
||||
ret = -EIO;
|
||||
if ((addr & 3) || addr < 0)
|
||||
break;
|
||||
|
||||
if (addr < sizeof(struct pt_regs)) {
|
||||
/* Ignore change of top 32 bits of SR */
|
||||
if (addr == offsetof (struct pt_regs, sr)+4)
|
||||
{
|
||||
ret = 0;
|
||||
break;
|
||||
}
|
||||
/* If lower 32 bits of SR, ignore non-user bits */
|
||||
if (addr == offsetof (struct pt_regs, sr))
|
||||
{
|
||||
long cursr = get_stack_long(child, addr);
|
||||
data &= ~(SR_MASK);
|
||||
data |= (cursr & SR_MASK);
|
||||
}
|
||||
ret = put_stack_long(child, addr, data);
|
||||
}
|
||||
else if ((addr >= offsetof(struct user, fpu)) &&
|
||||
(addr < offsetof(struct user, u_fpvalid))) {
|
||||
ret = put_fpu_long(child, addr - offsetof(struct user, fpu), data);
|
||||
}
|
||||
break;
|
||||
|
||||
case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
|
||||
case PTRACE_CONT: { /* restart after signal. */
|
||||
ret = -EIO;
|
||||
if (!valid_signal(data))
|
||||
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;
|
||||
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: {
|
||||
ret = 0;
|
||||
if (child->exit_state == EXIT_ZOMBIE) /* already dead */
|
||||
break;
|
||||
child->exit_code = SIGKILL;
|
||||
wake_up_process(child);
|
||||
break;
|
||||
}
|
||||
|
||||
case PTRACE_SINGLESTEP: { /* set the trap flag. */
|
||||
struct pt_regs *regs;
|
||||
|
||||
ret = -EIO;
|
||||
if (!valid_signal(data))
|
||||
break;
|
||||
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
|
||||
if ((child->ptrace & PT_DTRACE) == 0) {
|
||||
/* Spurious delayed TF traps may occur */
|
||||
child->ptrace |= PT_DTRACE;
|
||||
}
|
||||
|
||||
regs = child->thread.uregs;
|
||||
|
||||
regs->sr |= SR_SSTEP; /* auto-resetting upon exception */
|
||||
|
||||
child->exit_code = data;
|
||||
/* give it a chance to run. */
|
||||
wake_up_process(child);
|
||||
ret = 0;
|
||||
break;
|
||||
}
|
||||
|
||||
default:
|
||||
ret = ptrace_request(child, request, addr, data);
|
||||
break;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
asmlinkage int sh64_ptrace(long request, long pid, long addr, long data)
|
||||
{
|
||||
extern void poke_real_address_q(unsigned long long addr, unsigned long long data);
|
||||
#define WPC_DBRMODE 0x0d104008
|
||||
static int first_call = 1;
|
||||
|
||||
lock_kernel();
|
||||
if (first_call) {
|
||||
/* Set WPC.DBRMODE to 0. This makes all debug events get
|
||||
* delivered through RESVEC, i.e. into the handlers in entry.S.
|
||||
* (If the kernel was downloaded using a remote gdb, WPC.DBRMODE
|
||||
* would normally be left set to 1, which makes debug events get
|
||||
* delivered through DBRVEC, i.e. into the remote gdb's
|
||||
* handlers. This prevents ptrace getting them, and confuses
|
||||
* the remote gdb.) */
|
||||
printk("DBRMODE set to 0 to permit native debugging\n");
|
||||
poke_real_address_q(WPC_DBRMODE, 0);
|
||||
first_call = 0;
|
||||
}
|
||||
unlock_kernel();
|
||||
|
||||
return sys_ptrace(request, pid, addr, data);
|
||||
}
|
||||
|
||||
asmlinkage void syscall_trace(void)
|
||||
{
|
||||
struct task_struct *tsk = current;
|
||||
|
||||
if (!test_thread_flag(TIF_SYSCALL_TRACE))
|
||||
return;
|
||||
if (!(tsk->ptrace & PT_PTRACED))
|
||||
return;
|
||||
|
||||
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 (tsk->exit_code) {
|
||||
send_sig(tsk->exit_code, tsk, 1);
|
||||
tsk->exit_code = 0;
|
||||
}
|
||||
}
|
||||
|
||||
/* Called with interrupts disabled */
|
||||
asmlinkage void do_single_step(unsigned long long vec, struct pt_regs *regs)
|
||||
{
|
||||
/* This is called after a single step exception (DEBUGSS).
|
||||
There is no need to change the PC, as it is a post-execution
|
||||
exception, as entry.S does not do anything to the PC for DEBUGSS.
|
||||
We need to clear the Single Step setting in SR to avoid
|
||||
continually stepping. */
|
||||
local_irq_enable();
|
||||
regs->sr &= ~SR_SSTEP;
|
||||
force_sig(SIGTRAP, current);
|
||||
}
|
||||
|
||||
/* Called with interrupts disabled */
|
||||
asmlinkage void do_software_break_point(unsigned long long vec,
|
||||
struct pt_regs *regs)
|
||||
{
|
||||
/* We need to forward step the PC, to counteract the backstep done
|
||||
in signal.c. */
|
||||
local_irq_enable();
|
||||
force_sig(SIGTRAP, current);
|
||||
regs->pc += 4;
|
||||
}
|
||||
|
||||
/*
|
||||
* Called by kernel/ptrace.c when detaching..
|
||||
*
|
||||
* Make sure single step bits etc are not set.
|
||||
*/
|
||||
void ptrace_disable(struct task_struct *child)
|
||||
{
|
||||
/* nothing to do.. */
|
||||
}
|
||||
Reference in New Issue
Block a user