mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
![Namhyung Kim](/assets/img/avatar_default.png)
Use new 'regno', 'datap' variables in order to remove duplicated expressions and unnecessary castings. Alse remove checking @addr less than 0 because addr is now unsigned. Signed-off-by: Namhyung Kim <namhyung@gmail.com> Acked-by: Greg Ungerer <gerg@uclinux.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
255 lines
5.9 KiB
C
255 lines
5.9 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 <linux/tracehook.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;
|
|
}
|
|
|
|
void user_enable_single_step(struct task_struct *task)
|
|
{
|
|
unsigned long srflags;
|
|
srflags = get_reg(task, PT_SR) | (TRACE_BITS << 16);
|
|
put_reg(task, PT_SR, srflags);
|
|
}
|
|
|
|
void user_disable_single_step(struct task_struct *task)
|
|
{
|
|
unsigned long srflags;
|
|
srflags = get_reg(task, PT_SR) & ~(TRACE_BITS << 16);
|
|
put_reg(task, PT_SR, srflags);
|
|
}
|
|
|
|
/*
|
|
* Called by kernel/ptrace.c when detaching..
|
|
*
|
|
* Make sure the single step bit is not set.
|
|
*/
|
|
void ptrace_disable(struct task_struct *child)
|
|
{
|
|
/* make sure the single step bit is not set. */
|
|
user_disable_single_step(child);
|
|
}
|
|
|
|
long arch_ptrace(struct task_struct *child, long request,
|
|
unsigned long addr, unsigned long data)
|
|
{
|
|
int ret;
|
|
int regno = addr >> 2;
|
|
unsigned long __user *datap = (unsigned long __user *) data;
|
|
|
|
switch (request) {
|
|
/* read the word at location addr in the USER area. */
|
|
case PTRACE_PEEKUSR: {
|
|
unsigned long tmp;
|
|
|
|
ret = -EIO;
|
|
if ((addr & 3) || addr > sizeof(struct user) - 3)
|
|
break;
|
|
|
|
tmp = 0; /* Default return condition */
|
|
ret = -EIO;
|
|
if (regno < 19) {
|
|
tmp = get_reg(child, regno);
|
|
if (regno == PT_SR)
|
|
tmp >>= 16;
|
|
} else if (regno >= 21 && regno < 49) {
|
|
tmp = child->thread.fp[regno - 21];
|
|
} else if (regno == 49) {
|
|
tmp = child->mm->start_code;
|
|
} else if (regno == 50) {
|
|
tmp = child->mm->start_data;
|
|
} else if (regno == 51) {
|
|
tmp = child->mm->end_code;
|
|
} else
|
|
break;
|
|
ret = put_user(tmp, datap);
|
|
break;
|
|
}
|
|
|
|
case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
|
|
ret = -EIO;
|
|
if ((addr & 3) || addr > sizeof(struct user) - 3)
|
|
break;
|
|
|
|
if (regno == PT_SR) {
|
|
data &= SR_MASK;
|
|
data <<= 16;
|
|
data |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
|
|
}
|
|
if (regno < 19) {
|
|
if (put_reg(child, regno, data))
|
|
break;
|
|
ret = 0;
|
|
break;
|
|
}
|
|
if (regno >= 21 && regno < 48)
|
|
{
|
|
child->thread.fp[regno - 21] = data;
|
|
ret = 0;
|
|
}
|
|
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, datap)) {
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
datap++;
|
|
}
|
|
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, datap)) {
|
|
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);
|
|
datap++;
|
|
}
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
#ifdef PTRACE_GETFPREGS
|
|
case PTRACE_GETFPREGS: { /* Get the child FPU state. */
|
|
ret = 0;
|
|
if (copy_to_user(datap, &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, datap,
|
|
sizeof(struct user_m68kfp_struct)))
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
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;
|
|
}
|
|
|
|
asmlinkage int syscall_trace_enter(void)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (test_thread_flag(TIF_SYSCALL_TRACE))
|
|
ret = tracehook_report_syscall_entry(task_pt_regs(current));
|
|
return ret;
|
|
}
|
|
|
|
asmlinkage void syscall_trace_leave(void)
|
|
{
|
|
if (test_thread_flag(TIF_SYSCALL_TRACE))
|
|
tracehook_report_syscall_exit(task_pt_regs(current), 0);
|
|
}
|