278 строки
6.7 KiB
C
278 строки
6.7 KiB
C
/*
|
|
* linux/arch/m68k/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 0xC000
|
|
#define T1_BIT 0x8000
|
|
#define T0_BIT 0x4000
|
|
|
|
/* 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 const int regoff[] = {
|
|
[0] = PT_REG(d1),
|
|
[1] = PT_REG(d2),
|
|
[2] = PT_REG(d3),
|
|
[3] = PT_REG(d4),
|
|
[4] = PT_REG(d5),
|
|
[5] = SW_REG(d6),
|
|
[6] = SW_REG(d7),
|
|
[7] = PT_REG(a0),
|
|
[8] = PT_REG(a1),
|
|
[9] = PT_REG(a2),
|
|
[10] = SW_REG(a3),
|
|
[11] = SW_REG(a4),
|
|
[12] = SW_REG(a5),
|
|
[13] = SW_REG(a6),
|
|
[14] = PT_REG(d0),
|
|
[15] = -1,
|
|
[16] = PT_REG(orig_d0),
|
|
[17] = PT_REG(sr),
|
|
[18] = 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;
|
|
/* Need to take stkadj into account. */
|
|
if (regno == PT_SR || regno == PT_PC) {
|
|
long stkadj = *(long *)(task->thread.esp0 + PT_REG(stkadj));
|
|
addr = (unsigned long *) ((unsigned long)addr + stkadj);
|
|
/* The sr is actually a 16 bit register. */
|
|
if (regno == PT_SR)
|
|
return *(unsigned short *)addr;
|
|
}
|
|
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;
|
|
/* Need to take stkadj into account. */
|
|
if (regno == PT_SR || regno == PT_PC) {
|
|
long stkadj = *(long *)(task->thread.esp0 + PT_REG(stkadj));
|
|
addr = (unsigned long *) ((unsigned long)addr + stkadj);
|
|
/* The sr is actually a 16 bit register. */
|
|
if (regno == PT_SR) {
|
|
*(unsigned short *)addr = data;
|
|
return 0;
|
|
}
|
|
}
|
|
*addr = data;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Make sure the single step bit is not set.
|
|
*/
|
|
static inline void singlestep_disable(struct task_struct *child)
|
|
{
|
|
unsigned long tmp = get_reg(child, PT_SR) & ~TRACE_BITS;
|
|
put_reg(child, PT_SR, tmp);
|
|
clear_tsk_thread_flag(child, TIF_DELAYED_TRACE);
|
|
}
|
|
|
|
/*
|
|
* Called by kernel/ptrace.c when detaching..
|
|
*/
|
|
void ptrace_disable(struct task_struct *child)
|
|
{
|
|
singlestep_disable(child);
|
|
}
|
|
|
|
void user_enable_single_step(struct task_struct *child)
|
|
{
|
|
unsigned long tmp = get_reg(child, PT_SR) & ~TRACE_BITS;
|
|
put_reg(child, PT_SR, tmp | T1_BIT);
|
|
set_tsk_thread_flag(child, TIF_DELAYED_TRACE);
|
|
}
|
|
|
|
void user_enable_block_step(struct task_struct *child)
|
|
{
|
|
unsigned long tmp = get_reg(child, PT_SR) & ~TRACE_BITS;
|
|
put_reg(child, PT_SR, tmp | T0_BIT);
|
|
}
|
|
|
|
void user_disable_single_step(struct task_struct *child)
|
|
{
|
|
singlestep_disable(child);
|
|
}
|
|
|
|
long arch_ptrace(struct task_struct *child, long request,
|
|
unsigned long addr, unsigned long data)
|
|
{
|
|
unsigned long tmp;
|
|
int i, ret = 0;
|
|
int regno = addr >> 2; /* temporary hack. */
|
|
unsigned long __user *datap = (unsigned long __user *) data;
|
|
|
|
switch (request) {
|
|
/* read the word at location addr in the USER area. */
|
|
case PTRACE_PEEKUSR:
|
|
if (addr & 3)
|
|
goto out_eio;
|
|
|
|
if (regno >= 0 && regno < 19) {
|
|
tmp = get_reg(child, regno);
|
|
} else if (regno >= 21 && regno < 49) {
|
|
tmp = child->thread.fp[regno - 21];
|
|
/* Convert internal fpu reg representation
|
|
* into long double format
|
|
*/
|
|
if (FPU_IS_EMU && (regno < 45) && !(regno % 3))
|
|
tmp = ((tmp & 0xffff0000) << 15) |
|
|
((tmp & 0x0000ffff) << 16);
|
|
} else
|
|
goto out_eio;
|
|
ret = put_user(tmp, datap);
|
|
break;
|
|
|
|
case PTRACE_POKEUSR:
|
|
/* write the word at location addr in the USER area */
|
|
if (addr & 3)
|
|
goto out_eio;
|
|
|
|
if (regno == PT_SR) {
|
|
data &= SR_MASK;
|
|
data |= get_reg(child, PT_SR) & ~SR_MASK;
|
|
}
|
|
if (regno >= 0 && regno < 19) {
|
|
if (put_reg(child, regno, data))
|
|
goto out_eio;
|
|
} else if (regno >= 21 && regno < 48) {
|
|
/* Convert long double format
|
|
* into internal fpu reg representation
|
|
*/
|
|
if (FPU_IS_EMU && (regno < 45) && !(regno % 3)) {
|
|
data <<= 15;
|
|
data = (data & 0xffff0000) |
|
|
((data & 0x0000ffff) >> 1);
|
|
}
|
|
child->thread.fp[regno - 21] = data;
|
|
} else
|
|
goto out_eio;
|
|
break;
|
|
|
|
case PTRACE_GETREGS: /* Get all gp regs from the child. */
|
|
for (i = 0; i < 19; i++) {
|
|
tmp = get_reg(child, i);
|
|
ret = put_user(tmp, datap);
|
|
if (ret)
|
|
break;
|
|
datap++;
|
|
}
|
|
break;
|
|
|
|
case PTRACE_SETREGS: /* Set all gp regs in the child. */
|
|
for (i = 0; i < 19; i++) {
|
|
ret = get_user(tmp, datap);
|
|
if (ret)
|
|
break;
|
|
if (i == PT_SR) {
|
|
tmp &= SR_MASK;
|
|
tmp |= get_reg(child, PT_SR) & ~SR_MASK;
|
|
}
|
|
put_reg(child, i, tmp);
|
|
datap++;
|
|
}
|
|
break;
|
|
|
|
case PTRACE_GETFPREGS: /* Get the child FPU state. */
|
|
if (copy_to_user(datap, &child->thread.fp,
|
|
sizeof(struct user_m68kfp_struct)))
|
|
ret = -EFAULT;
|
|
break;
|
|
|
|
case PTRACE_SETFPREGS: /* Set the child FPU state. */
|
|
if (copy_from_user(&child->thread.fp, datap,
|
|
sizeof(struct user_m68kfp_struct)))
|
|
ret = -EFAULT;
|
|
break;
|
|
|
|
case PTRACE_GET_THREAD_AREA:
|
|
ret = put_user(task_thread_info(child)->tp_value, datap);
|
|
break;
|
|
|
|
default:
|
|
ret = ptrace_request(child, request, addr, data);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
out_eio:
|
|
return -EIO;
|
|
}
|
|
|
|
asmlinkage void syscall_trace(void)
|
|
{
|
|
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;
|
|
}
|
|
}
|