335 lines
8.2 KiB
C
335 lines
8.2 KiB
C
/*
|
|
* linux/arch/m68knommu/kernel/ptrace.c
|
|
*
|
|
* Copyright (C) 1994 by Hamish Macdonald
|
|
* Taken from linux/kernel/ptrace.c and modified for M680x0.
|
|
* linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/user.h>
|
|
#include <linux/signal.h>
|
|
|
|
#include <asm/uaccess.h>
|
|
#include <asm/page.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/system.h>
|
|
#include <asm/processor.h>
|
|
|
|
/*
|
|
* does not yet catch signals sent when the child dies.
|
|
* in exit.c or in signal.c.
|
|
*/
|
|
|
|
/* determines which bits in the SR the user has access to. */
|
|
/* 1 = access 0 = no access */
|
|
#define SR_MASK 0x001f
|
|
|
|
/* sets the trace bits. */
|
|
#define TRACE_BITS 0x8000
|
|
|
|
/* Find the stack offset for a register, relative to thread.esp0. */
|
|
#define PT_REG(reg) ((long)&((struct pt_regs *)0)->reg)
|
|
#define SW_REG(reg) ((long)&((struct switch_stack *)0)->reg \
|
|
- sizeof(struct switch_stack))
|
|
/* Mapping from PT_xxx to the stack offset at which the register is
|
|
saved. Notice that usp has no stack-slot and needs to be treated
|
|
specially (see get_reg/put_reg below). */
|
|
static int regoff[] = {
|
|
PT_REG(d1), PT_REG(d2), PT_REG(d3), PT_REG(d4),
|
|
PT_REG(d5), SW_REG(d6), SW_REG(d7), PT_REG(a0),
|
|
PT_REG(a1), PT_REG(a2), SW_REG(a3), SW_REG(a4),
|
|
SW_REG(a5), SW_REG(a6), PT_REG(d0), -1,
|
|
PT_REG(orig_d0), PT_REG(sr), PT_REG(pc),
|
|
};
|
|
|
|
/*
|
|
* Get contents of register REGNO in task TASK.
|
|
*/
|
|
static inline long get_reg(struct task_struct *task, int regno)
|
|
{
|
|
unsigned long *addr;
|
|
|
|
if (regno == PT_USP)
|
|
addr = &task->thread.usp;
|
|
else if (regno < ARRAY_SIZE(regoff))
|
|
addr = (unsigned long *)(task->thread.esp0 + regoff[regno]);
|
|
else
|
|
return 0;
|
|
return *addr;
|
|
}
|
|
|
|
/*
|
|
* Write contents of register REGNO in task TASK.
|
|
*/
|
|
static inline int put_reg(struct task_struct *task, int regno,
|
|
unsigned long data)
|
|
{
|
|
unsigned long *addr;
|
|
|
|
if (regno == PT_USP)
|
|
addr = &task->thread.usp;
|
|
else if (regno < ARRAY_SIZE(regoff))
|
|
addr = (unsigned long *) (task->thread.esp0 + regoff[regno]);
|
|
else
|
|
return -1;
|
|
*addr = data;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Called by kernel/ptrace.c when detaching..
|
|
*
|
|
* Make sure the single step bit is not set.
|
|
*/
|
|
void ptrace_disable(struct task_struct *child)
|
|
{
|
|
unsigned long tmp;
|
|
/* make sure the single step bit is not set. */
|
|
tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
|
|
put_reg(child, PT_SR, tmp);
|
|
}
|
|
|
|
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 ||
|
|
addr > sizeof(struct user) - 3)
|
|
break;
|
|
|
|
tmp = 0; /* Default return condition */
|
|
addr = addr >> 2; /* temporary hack. */
|
|
ret = -EIO;
|
|
if (addr < 19) {
|
|
tmp = get_reg(child, addr);
|
|
if (addr == PT_SR)
|
|
tmp >>= 16;
|
|
} else if (addr >= 21 && addr < 49) {
|
|
tmp = child->thread.fp[addr - 21];
|
|
#ifdef CONFIG_M68KFPU_EMU
|
|
/* Convert internal fpu reg representation
|
|
* into long double format
|
|
*/
|
|
if (FPU_IS_EMU && (addr < 45) && !(addr % 3))
|
|
tmp = ((tmp & 0xffff0000) << 15) |
|
|
((tmp & 0x0000ffff) << 16);
|
|
#endif
|
|
} else if (addr == 49) {
|
|
tmp = child->mm->start_code;
|
|
} else if (addr == 50) {
|
|
tmp = child->mm->start_data;
|
|
} else if (addr == 51) {
|
|
tmp = child->mm->end_code;
|
|
} 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 */
|
|
ret = -EIO;
|
|
if ((addr & 3) || addr < 0 ||
|
|
addr > sizeof(struct user) - 3)
|
|
break;
|
|
|
|
addr = addr >> 2; /* temporary hack. */
|
|
|
|
if (addr == PT_SR) {
|
|
data &= SR_MASK;
|
|
data <<= 16;
|
|
data |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
|
|
}
|
|
if (addr < 19) {
|
|
if (put_reg(child, addr, data))
|
|
break;
|
|
ret = 0;
|
|
break;
|
|
}
|
|
if (addr >= 21 && addr < 48)
|
|
{
|
|
#ifdef CONFIG_M68KFPU_EMU
|
|
/* Convert long double format
|
|
* into internal fpu reg representation
|
|
*/
|
|
if (FPU_IS_EMU && (addr < 45) && !(addr % 3)) {
|
|
data = (unsigned long)data << 15;
|
|
data = (data & 0xffff0000) |
|
|
((data & 0x0000ffff) >> 1);
|
|
}
|
|
#endif
|
|
child->thread.fp[addr - 21] = data;
|
|
ret = 0;
|
|
}
|
|
break;
|
|
|
|
case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
|
|
case PTRACE_CONT: { /* restart after signal. */
|
|
long tmp;
|
|
|
|
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;
|
|
/* make sure the single step bit is not set. */
|
|
tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
|
|
put_reg(child, PT_SR, tmp);
|
|
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: {
|
|
long tmp;
|
|
|
|
ret = 0;
|
|
if (child->exit_state == EXIT_ZOMBIE) /* already dead */
|
|
break;
|
|
child->exit_code = SIGKILL;
|
|
/* make sure the single step bit is not set. */
|
|
tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
|
|
put_reg(child, PT_SR, tmp);
|
|
wake_up_process(child);
|
|
break;
|
|
}
|
|
|
|
case PTRACE_SINGLESTEP: { /* set the trap flag. */
|
|
long tmp;
|
|
|
|
ret = -EIO;
|
|
if (!valid_signal(data))
|
|
break;
|
|
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
|
|
tmp = get_reg(child, PT_SR) | (TRACE_BITS << 16);
|
|
put_reg(child, PT_SR, tmp);
|
|
|
|
child->exit_code = data;
|
|
/* give it a chance to run. */
|
|
wake_up_process(child);
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
case PTRACE_DETACH: /* detach a process that was attached. */
|
|
ret = ptrace_detach(child, data);
|
|
break;
|
|
|
|
case PTRACE_GETREGS: { /* Get all gp regs from the child. */
|
|
int i;
|
|
unsigned long tmp;
|
|
for (i = 0; i < 19; i++) {
|
|
tmp = get_reg(child, i);
|
|
if (i == PT_SR)
|
|
tmp >>= 16;
|
|
if (put_user(tmp, (unsigned long *) data)) {
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
data += sizeof(long);
|
|
}
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
case PTRACE_SETREGS: { /* Set all gp regs in the child. */
|
|
int i;
|
|
unsigned long tmp;
|
|
for (i = 0; i < 19; i++) {
|
|
if (get_user(tmp, (unsigned long *) data)) {
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
if (i == PT_SR) {
|
|
tmp &= SR_MASK;
|
|
tmp <<= 16;
|
|
tmp |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
|
|
}
|
|
put_reg(child, i, tmp);
|
|
data += sizeof(long);
|
|
}
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
#ifdef PTRACE_GETFPREGS
|
|
case PTRACE_GETFPREGS: { /* Get the child FPU state. */
|
|
ret = 0;
|
|
if (copy_to_user((void *)data, &child->thread.fp,
|
|
sizeof(struct user_m68kfp_struct)))
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
#ifdef PTRACE_SETFPREGS
|
|
case PTRACE_SETFPREGS: { /* Set the child FPU state. */
|
|
ret = 0;
|
|
if (copy_from_user(&child->thread.fp, (void *)data,
|
|
sizeof(struct user_m68kfp_struct)))
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
default:
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
asmlinkage void syscall_trace(void)
|
|
{
|
|
if (!test_thread_flag(TIF_SYSCALL_TRACE))
|
|
return;
|
|
if (!(current->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 (current->exit_code) {
|
|
send_sig(current->exit_code, current, 1);
|
|
current->exit_code = 0;
|
|
}
|
|
}
|