/*
|
/*
|
* linux/arch/m68knommu/kernel/ptrace.c
|
* linux/arch/m68knommu/kernel/ptrace.c
|
*
|
*
|
* Copyright (C) 1998 D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>,
|
* Copyright (C) 1998 D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>,
|
* Kenneth Albanowski <kjahds@kjahds.com>,
|
* Kenneth Albanowski <kjahds@kjahds.com>,
|
* The Silver Hammer Group, Ltd.
|
* The Silver Hammer Group, Ltd.
|
*
|
*
|
* Based on:
|
* Based on:
|
*
|
*
|
* linux/arch/m68k/kernel/ptrace
|
* linux/arch/m68k/kernel/ptrace
|
*
|
*
|
* Copyright (C) 1994 by Hamish Macdonald
|
* Copyright (C) 1994 by Hamish Macdonald
|
* Taken from linux/kernel/ptrace.c and modified for M680x0.
|
* 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
|
* 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
|
* This file is subject to the terms and conditions of the GNU General
|
* Public License. See the file COPYING in the main directory of
|
* Public License. See the file COPYING in the main directory of
|
* this archive for more details.
|
* this archive for more details.
|
*/
|
*/
|
|
|
#include <stddef.h>
|
#include <stddef.h>
|
#include <linux/kernel.h>
|
#include <linux/kernel.h>
|
#include <linux/sched.h>
|
#include <linux/sched.h>
|
#include <linux/string.h>
|
#include <linux/string.h>
|
|
|
#include <linux/mm.h>
|
#include <linux/mm.h>
|
#include <linux/errno.h>
|
#include <linux/errno.h>
|
#include <linux/ptrace.h>
|
#include <linux/ptrace.h>
|
#include <linux/user.h>
|
#include <linux/user.h>
|
|
|
#include <asm/segment.h>
|
#include <asm/segment.h>
|
#include <asm/page.h>
|
#include <asm/page.h>
|
#include <asm/pgtable.h>
|
#include <asm/pgtable.h>
|
#include <asm/system.h>
|
#include <asm/system.h>
|
|
|
/*
|
/*
|
* does not yet catch signals sent when the child dies.
|
* does not yet catch signals sent when the child dies.
|
* in exit.c or in signal.c.
|
* in exit.c or in signal.c.
|
*/
|
*/
|
|
|
/* determines which bits in the SR the user has access to. */
|
/* determines which bits in the SR the user has access to. */
|
/* 1 = access 0 = no access */
|
/* 1 = access 0 = no access */
|
#define SR_MASK 0x001f
|
#define SR_MASK 0x001f
|
|
|
/* sets the trace bits. */
|
/* sets the trace bits. */
|
#define TRACE_BITS 0x8000
|
#define TRACE_BITS 0x8000
|
|
|
/* Mapping from PT_xxx to the stack offset at which the register is
|
/* 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
|
saved. Notice that usp has no stack-slot and needs to be treated
|
specially (see get_reg/put_reg below). */
|
specially (see get_reg/put_reg below). */
|
static int regoff[] = {0,0,0,0,0,0};
|
static int regoff[] = {0,0,0,0,0,0};
|
|
|
/* change a pid into a task struct. */
|
/* change a pid into a task struct. */
|
static inline struct task_struct * get_task(int pid)
|
static inline struct task_struct * get_task(int pid)
|
{
|
{
|
int i;
|
int i;
|
|
|
for (i = 1; i < NR_TASKS; i++) {
|
for (i = 1; i < NR_TASKS; i++) {
|
if (task[i] != NULL && (task[i]->pid == pid))
|
if (task[i] != NULL && (task[i]->pid == pid))
|
return task[i];
|
return task[i];
|
}
|
}
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
/*
|
/*
|
* Get contents of register REGNO in task TASK.
|
* Get contents of register REGNO in task TASK.
|
*/
|
*/
|
static inline long get_reg(struct task_struct *task, int regno)
|
static inline long get_reg(struct task_struct *task, int regno)
|
{
|
{
|
unsigned long *addr;
|
unsigned long *addr;
|
/* SIMON */
|
/* SIMON */
|
#if 0
|
#if 0
|
if (regno == PT_USP)
|
if (regno == PT_USP)
|
addr = &task->tss.usp;
|
addr = &task->tss.usp;
|
else if (regno < sizeof(regoff)/sizeof(regoff[0]))
|
else if (regno < sizeof(regoff)/sizeof(regoff[0]))
|
addr = (unsigned long *)(task->tss.esp0 + regoff[regno]);
|
addr = (unsigned long *)(task->tss.esp0 + regoff[regno]);
|
else
|
else
|
return 0;
|
return 0;
|
#endif
|
#endif
|
return *addr;
|
return *addr;
|
}
|
}
|
|
|
/*
|
/*
|
* Write contents of register REGNO in task TASK.
|
* Write contents of register REGNO in task TASK.
|
*/
|
*/
|
static inline int put_reg(struct task_struct *task, int regno,
|
static inline int put_reg(struct task_struct *task, int regno,
|
unsigned long data)
|
unsigned long data)
|
{
|
{
|
/* SIMON */
|
/* SIMON */
|
#if 0
|
#if 0
|
unsigned long *addr;
|
unsigned long *addr;
|
if (regno == PT_USP)
|
if (regno == PT_USP)
|
addr = &task->tss.usp;
|
addr = &task->tss.usp;
|
else if (regno < sizeof(regoff)/sizeof(regoff[0]))
|
else if (regno < sizeof(regoff)/sizeof(regoff[0]))
|
addr = (unsigned long *) (task->tss.esp0 + regoff[regno]);
|
addr = (unsigned long *) (task->tss.esp0 + regoff[regno]);
|
else
|
else
|
return -1;
|
return -1;
|
*addr = data;
|
*addr = data;
|
#endif
|
#endif
|
return 0;
|
return 0;
|
}
|
}
|
|
|
inline
|
inline
|
static unsigned long get_long(struct task_struct * tsk,
|
static unsigned long get_long(struct task_struct * tsk,
|
struct vm_area_struct * vma, unsigned long addr)
|
struct vm_area_struct * vma, unsigned long addr)
|
{
|
{
|
return *(unsigned long*)addr;
|
return *(unsigned long*)addr;
|
}
|
}
|
|
|
inline
|
inline
|
static void put_long(struct task_struct * tsk, struct vm_area_struct * vma, unsigned long addr,
|
static void put_long(struct task_struct * tsk, struct vm_area_struct * vma, unsigned long addr,
|
unsigned long data)
|
unsigned long data)
|
{
|
{
|
*(unsigned long*)addr = data;
|
*(unsigned long*)addr = data;
|
}
|
}
|
|
|
|
|
inline
|
inline
|
static int read_long(struct task_struct * tsk, unsigned long addr,
|
static int read_long(struct task_struct * tsk, unsigned long addr,
|
unsigned long * result)
|
unsigned long * result)
|
{
|
{
|
*result = *(unsigned long *)addr;
|
*result = *(unsigned long *)addr;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
inline
|
inline
|
static int write_long(struct task_struct * tsk, unsigned long addr,
|
static int write_long(struct task_struct * tsk, unsigned long addr,
|
unsigned long data)
|
unsigned long data)
|
{
|
{
|
*(unsigned long *)addr = data;
|
*(unsigned long *)addr = data;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
|
asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
|
{
|
{
|
/* SIMON */
|
/* SIMON */
|
#if 0
|
#if 0
|
struct task_struct *child;
|
struct task_struct *child;
|
struct user * dummy;
|
struct user * dummy;
|
dummy = NULL;
|
dummy = NULL;
|
|
|
if (request == PTRACE_TRACEME) {
|
if (request == PTRACE_TRACEME) {
|
/* are we already being traced? */
|
/* are we already being traced? */
|
if (current->flags & PF_PTRACED)
|
if (current->flags & PF_PTRACED)
|
return -EPERM;
|
return -EPERM;
|
/* set the ptrace bit in the process flags. */
|
/* set the ptrace bit in the process flags. */
|
current->flags |= PF_PTRACED;
|
current->flags |= PF_PTRACED;
|
return 0;
|
return 0;
|
}
|
}
|
if (pid == 1) /* you may not mess with init */
|
if (pid == 1) /* you may not mess with init */
|
return -EPERM;
|
return -EPERM;
|
if (!(child = get_task(pid)))
|
if (!(child = get_task(pid)))
|
return -ESRCH;
|
return -ESRCH;
|
if (request == PTRACE_ATTACH) {
|
if (request == PTRACE_ATTACH) {
|
if (child == current)
|
if (child == current)
|
return -EPERM;
|
return -EPERM;
|
if ((!child->dumpable ||
|
if ((!child->dumpable ||
|
(current->uid != child->euid) ||
|
(current->uid != child->euid) ||
|
(current->uid != child->suid) ||
|
(current->uid != child->suid) ||
|
(current->uid != child->uid) ||
|
(current->uid != child->uid) ||
|
(current->gid != child->egid) ||
|
(current->gid != child->egid) ||
|
(current->gid != child->sgid) ||
|
(current->gid != child->sgid) ||
|
(current->gid != child->gid)) && !suser())
|
(current->gid != child->gid)) && !suser())
|
return -EPERM;
|
return -EPERM;
|
/* the same process cannot be attached many times */
|
/* the same process cannot be attached many times */
|
if (child->flags & PF_PTRACED)
|
if (child->flags & PF_PTRACED)
|
return -EPERM;
|
return -EPERM;
|
child->flags |= PF_PTRACED;
|
child->flags |= PF_PTRACED;
|
if (child->p_pptr != current) {
|
if (child->p_pptr != current) {
|
REMOVE_LINKS(child);
|
REMOVE_LINKS(child);
|
child->p_pptr = current;
|
child->p_pptr = current;
|
SET_LINKS(child);
|
SET_LINKS(child);
|
}
|
}
|
send_sig(SIGSTOP, child, 1);
|
send_sig(SIGSTOP, child, 1);
|
return 0;
|
return 0;
|
}
|
}
|
if (!(child->flags & PF_PTRACED))
|
if (!(child->flags & PF_PTRACED))
|
return -ESRCH;
|
return -ESRCH;
|
if (child->state != TASK_STOPPED) {
|
if (child->state != TASK_STOPPED) {
|
if (request != PTRACE_KILL)
|
if (request != PTRACE_KILL)
|
return -ESRCH;
|
return -ESRCH;
|
}
|
}
|
if (child->p_pptr != current)
|
if (child->p_pptr != current)
|
return -ESRCH;
|
return -ESRCH;
|
|
|
switch (request) {
|
switch (request) {
|
/* when I and D space are separate, these will need to be fixed. */
|
/* when I and D space are separate, these will need to be fixed. */
|
case PTRACE_PEEKTEXT: /* read word at location addr. */
|
case PTRACE_PEEKTEXT: /* read word at location addr. */
|
case PTRACE_PEEKDATA: {
|
case PTRACE_PEEKDATA: {
|
unsigned long tmp;
|
unsigned long tmp;
|
int res;
|
int res;
|
|
|
res = read_long(child, addr, &tmp);
|
res = read_long(child, addr, &tmp);
|
if (res < 0)
|
if (res < 0)
|
return res;
|
return res;
|
res = verify_area(VERIFY_WRITE, (void *) data, sizeof(long));
|
res = verify_area(VERIFY_WRITE, (void *) data, sizeof(long));
|
if (!res)
|
if (!res)
|
put_user(tmp, (unsigned long *) data);
|
put_user(tmp, (unsigned long *) data);
|
return res;
|
return res;
|
}
|
}
|
|
|
/* read the word at location addr in the USER area. */
|
/* read the word at location addr in the USER area. */
|
case PTRACE_PEEKUSR: {
|
case PTRACE_PEEKUSR: {
|
unsigned long tmp;
|
unsigned long tmp;
|
int res;
|
int res;
|
|
|
if ((addr & 3) || addr < 0 || addr >= sizeof(struct user))
|
if ((addr & 3) || addr < 0 || addr >= sizeof(struct user))
|
return -EIO;
|
return -EIO;
|
|
|
res = verify_area(VERIFY_WRITE, (void *) data,
|
res = verify_area(VERIFY_WRITE, (void *) data,
|
sizeof(long));
|
sizeof(long));
|
if (res)
|
if (res)
|
return res;
|
return res;
|
tmp = 0; /* Default return condition */
|
tmp = 0; /* Default return condition */
|
addr = addr >> 2; /* temporary hack. */
|
addr = addr >> 2; /* temporary hack. */
|
if (addr < 19) {
|
if (addr < 19) {
|
tmp = get_reg(child, addr);
|
tmp = get_reg(child, addr);
|
if (addr == PT_SR)
|
if (addr == PT_SR)
|
tmp >>= 16;
|
tmp >>= 16;
|
}
|
}
|
else if (addr >= 21 && addr < 49)
|
else if (addr >= 21 && addr < 49)
|
tmp = child->tss.fp[addr - 21];
|
tmp = child->tss.fp[addr - 21];
|
else if (addr == 49)
|
else if (addr == 49)
|
tmp = child->mm->start_code;
|
tmp = child->mm->start_code;
|
else if (addr == 50)
|
else if (addr == 50)
|
tmp = child->mm->start_data;
|
tmp = child->mm->start_data;
|
else
|
else
|
return -EIO;
|
return -EIO;
|
put_user(tmp,(unsigned long *) data);
|
put_user(tmp,(unsigned long *) data);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* when I and D space are separate, this will have to be fixed. */
|
/* when I and D space are separate, this will have to be fixed. */
|
case PTRACE_POKETEXT: /* write the word at location addr. */
|
case PTRACE_POKETEXT: /* write the word at location addr. */
|
case PTRACE_POKEDATA:
|
case PTRACE_POKEDATA:
|
return write_long(child,addr,data);
|
return write_long(child,addr,data);
|
|
|
case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
|
case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
|
if ((addr & 3) || addr < 0 || addr >= sizeof(struct user))
|
if ((addr & 3) || addr < 0 || addr >= sizeof(struct user))
|
return -EIO;
|
return -EIO;
|
|
|
addr = addr >> 2; /* temporary hack. */
|
addr = addr >> 2; /* temporary hack. */
|
|
|
if (addr == PT_ORIG_D0)
|
if (addr == PT_ORIG_D0)
|
return -EIO;
|
return -EIO;
|
if (addr == PT_SR) {
|
if (addr == PT_SR) {
|
data &= SR_MASK;
|
data &= SR_MASK;
|
data <<= 16;
|
data <<= 16;
|
data |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
|
data |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
|
}
|
}
|
if (addr < 19) {
|
if (addr < 19) {
|
if (put_reg(child, addr, data))
|
if (put_reg(child, addr, data))
|
return -EIO;
|
return -EIO;
|
return 0;
|
return 0;
|
}
|
}
|
if (addr >= 21 && addr < 48)
|
if (addr >= 21 && addr < 48)
|
{
|
{
|
child->tss.fp[addr - 21] = data;
|
child->tss.fp[addr - 21] = data;
|
return 0;
|
return 0;
|
}
|
}
|
return -EIO;
|
return -EIO;
|
|
|
case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
|
case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
|
case PTRACE_CONT: { /* restart after signal. */
|
case PTRACE_CONT: { /* restart after signal. */
|
long tmp;
|
long tmp;
|
|
|
if ((unsigned long) data >= NSIG)
|
if ((unsigned long) data >= NSIG)
|
return -EIO;
|
return -EIO;
|
if (request == PTRACE_SYSCALL)
|
if (request == PTRACE_SYSCALL)
|
child->flags |= PF_TRACESYS;
|
child->flags |= PF_TRACESYS;
|
else
|
else
|
child->flags &= ~PF_TRACESYS;
|
child->flags &= ~PF_TRACESYS;
|
child->exit_code = data;
|
child->exit_code = data;
|
wake_up_process(child);
|
wake_up_process(child);
|
/* make sure the single step bit is not set. */
|
/* make sure the single step bit is not set. */
|
tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
|
tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
|
put_reg(child, PT_SR, tmp);
|
put_reg(child, PT_SR, tmp);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/*
|
/*
|
* make the child exit. Best I can do is send it a sigkill.
|
* 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
|
* perhaps it should be put in the status that it wants to
|
* exit.
|
* exit.
|
*/
|
*/
|
case PTRACE_KILL: {
|
case PTRACE_KILL: {
|
long tmp;
|
long tmp;
|
|
|
if (child->state == TASK_ZOMBIE) /* already dead */
|
if (child->state == TASK_ZOMBIE) /* already dead */
|
return 0;
|
return 0;
|
wake_up_process(child);
|
wake_up_process(child);
|
child->exit_code = SIGKILL;
|
child->exit_code = SIGKILL;
|
/* make sure the single step bit is not set. */
|
/* make sure the single step bit is not set. */
|
tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
|
tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
|
put_reg(child, PT_SR, tmp);
|
put_reg(child, PT_SR, tmp);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
case PTRACE_SINGLESTEP: { /* set the trap flag. */
|
case PTRACE_SINGLESTEP: { /* set the trap flag. */
|
long tmp;
|
long tmp;
|
|
|
if ((unsigned long) data >= NSIG)
|
if ((unsigned long) data >= NSIG)
|
return -EIO;
|
return -EIO;
|
child->flags &= ~PF_TRACESYS;
|
child->flags &= ~PF_TRACESYS;
|
tmp = get_reg(child, PT_SR) | (TRACE_BITS << 16);
|
tmp = get_reg(child, PT_SR) | (TRACE_BITS << 16);
|
put_reg(child, PT_SR, tmp);
|
put_reg(child, PT_SR, tmp);
|
|
|
wake_up_process(child);
|
wake_up_process(child);
|
child->exit_code = data;
|
child->exit_code = data;
|
/* give it a chance to run. */
|
/* give it a chance to run. */
|
return 0;
|
return 0;
|
}
|
}
|
|
|
case PTRACE_DETACH: { /* detach a process that was attached. */
|
case PTRACE_DETACH: { /* detach a process that was attached. */
|
long tmp;
|
long tmp;
|
|
|
if ((unsigned long) data >= NSIG)
|
if ((unsigned long) data >= NSIG)
|
return -EIO;
|
return -EIO;
|
child->flags &= ~(PF_PTRACED|PF_TRACESYS);
|
child->flags &= ~(PF_PTRACED|PF_TRACESYS);
|
wake_up_process(child);
|
wake_up_process(child);
|
child->exit_code = data;
|
child->exit_code = data;
|
REMOVE_LINKS(child);
|
REMOVE_LINKS(child);
|
child->p_pptr = child->p_opptr;
|
child->p_pptr = child->p_opptr;
|
SET_LINKS(child);
|
SET_LINKS(child);
|
/* make sure the single step bit is not set. */
|
/* make sure the single step bit is not set. */
|
tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
|
tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
|
put_reg(child, PT_SR, tmp);
|
put_reg(child, PT_SR, tmp);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
default:
|
default:
|
return -EIO;
|
return -EIO;
|
}
|
}
|
#endif
|
#endif
|
return 0;
|
return 0;
|
}
|
}
|
|
|
asmlinkage void syscall_trace(void)
|
asmlinkage void syscall_trace(void)
|
{
|
{
|
if ((current->flags & (PF_PTRACED|PF_TRACESYS))
|
if ((current->flags & (PF_PTRACED|PF_TRACESYS))
|
!= (PF_PTRACED|PF_TRACESYS))
|
!= (PF_PTRACED|PF_TRACESYS))
|
return;
|
return;
|
current->exit_code = SIGTRAP;
|
current->exit_code = SIGTRAP;
|
current->state = TASK_STOPPED;
|
current->state = TASK_STOPPED;
|
notify_parent(current, SIGCHLD);
|
notify_parent(current, SIGCHLD);
|
schedule();
|
schedule();
|
/*
|
/*
|
* this isn't the same as continuing with a signal, but it will do
|
* 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
|
* for normal use. strace only continues with a signal if the
|
* stopping signal is not SIGTRAP. -brl
|
* stopping signal is not SIGTRAP. -brl
|
*/
|
*/
|
if (current->exit_code)
|
if (current->exit_code)
|
current->signal |= (1 << (current->exit_code - 1));
|
current->signal |= (1 << (current->exit_code - 1));
|
current->exit_code = 0;
|
current->exit_code = 0;
|
return;
|
return;
|
}
|
}
|
|
|
