forked from Minki/linux
291 lines
6.8 KiB
C
291 lines
6.8 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* Copyright (C) 1992 Ross Biro
|
|
* Copyright (C) Linus Torvalds
|
|
* Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle
|
|
* Copyright (C) 1996 David S. Miller
|
|
* Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
|
|
* Copyright (C) 1999 MIPS Technologies, Inc.
|
|
* Copyright (C) 2000 Ulf Carlsson
|
|
*
|
|
* At this time Linux/MIPS64 only supports syscall tracing, even for 32-bit
|
|
* binaries.
|
|
*/
|
|
#include <linux/compiler.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/user.h>
|
|
#include <linux/security.h>
|
|
|
|
#include <asm/cpu.h>
|
|
#include <asm/fpu.h>
|
|
#include <asm/mipsregs.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/page.h>
|
|
#include <asm/system.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/bootinfo.h>
|
|
|
|
/*
|
|
* Tracing a 32-bit process with a 64-bit strace and vice versa will not
|
|
* work. I don't know how to fix this.
|
|
*/
|
|
asmlinkage int sys32_ptrace(int request, int pid, int addr, int data)
|
|
{
|
|
struct task_struct *child;
|
|
int ret;
|
|
|
|
#if 0
|
|
printk("ptrace(r=%d,pid=%d,addr=%08lx,data=%08lx)\n",
|
|
(int) request, (int) pid, (unsigned long) addr,
|
|
(unsigned long) data);
|
|
#endif
|
|
lock_kernel();
|
|
ret = -EPERM;
|
|
if (request == PTRACE_TRACEME) {
|
|
/* are we already being traced? */
|
|
if (current->ptrace & PT_PTRACED)
|
|
goto out;
|
|
if ((ret = security_ptrace(current->parent, current)))
|
|
goto out;
|
|
/* set the ptrace bit in the process flags. */
|
|
current->ptrace |= PT_PTRACED;
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
ret = -ESRCH;
|
|
read_lock(&tasklist_lock);
|
|
child = find_task_by_pid(pid);
|
|
if (child)
|
|
get_task_struct(child);
|
|
read_unlock(&tasklist_lock);
|
|
if (!child)
|
|
goto out;
|
|
|
|
ret = -EPERM;
|
|
if (pid == 1) /* you may not mess with init */
|
|
goto out_tsk;
|
|
|
|
if (request == PTRACE_ATTACH) {
|
|
ret = ptrace_attach(child);
|
|
goto out_tsk;
|
|
}
|
|
|
|
ret = ptrace_check_attach(child, request == PTRACE_KILL);
|
|
if (ret < 0)
|
|
goto out_tsk;
|
|
|
|
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: {
|
|
unsigned int tmp;
|
|
int copied;
|
|
|
|
copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
|
|
ret = -EIO;
|
|
if (copied != sizeof(tmp))
|
|
break;
|
|
ret = put_user(tmp, (unsigned int *) (unsigned long) data);
|
|
break;
|
|
}
|
|
|
|
/* Read the word at location addr in the USER area. */
|
|
case PTRACE_PEEKUSR: {
|
|
struct pt_regs *regs;
|
|
unsigned int tmp;
|
|
|
|
regs = (struct pt_regs *) ((unsigned long) child->thread_info +
|
|
THREAD_SIZE - 32 - sizeof(struct pt_regs));
|
|
ret = 0; /* Default return value. */
|
|
|
|
switch (addr) {
|
|
case 0 ... 31:
|
|
tmp = regs->regs[addr];
|
|
break;
|
|
case FPR_BASE ... FPR_BASE + 31:
|
|
if (tsk_used_math(child)) {
|
|
fpureg_t *fregs = get_fpu_regs(child);
|
|
|
|
/*
|
|
* The odd registers are actually the high
|
|
* order bits of the values stored in the even
|
|
* registers - unless we're using r2k_switch.S.
|
|
*/
|
|
if (addr & 1)
|
|
tmp = (unsigned long) (fregs[((addr & ~1) - 32)] >> 32);
|
|
else
|
|
tmp = (unsigned long) (fregs[(addr - 32)] & 0xffffffff);
|
|
} else {
|
|
tmp = -1; /* FP not yet used */
|
|
}
|
|
break;
|
|
case PC:
|
|
tmp = regs->cp0_epc;
|
|
break;
|
|
case CAUSE:
|
|
tmp = regs->cp0_cause;
|
|
break;
|
|
case BADVADDR:
|
|
tmp = regs->cp0_badvaddr;
|
|
break;
|
|
case MMHI:
|
|
tmp = regs->hi;
|
|
break;
|
|
case MMLO:
|
|
tmp = regs->lo;
|
|
break;
|
|
case FPC_CSR:
|
|
if (cpu_has_fpu)
|
|
tmp = child->thread.fpu.hard.fcr31;
|
|
else
|
|
tmp = child->thread.fpu.soft.fcr31;
|
|
break;
|
|
case FPC_EIR: { /* implementation / version register */
|
|
unsigned int flags;
|
|
|
|
if (!cpu_has_fpu)
|
|
break;
|
|
|
|
flags = read_c0_status();
|
|
__enable_fpu();
|
|
__asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
|
|
write_c0_status(flags);
|
|
break;
|
|
}
|
|
default:
|
|
tmp = 0;
|
|
ret = -EIO;
|
|
goto out_tsk;
|
|
}
|
|
ret = put_user(tmp, (unsigned *) (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 = 0;
|
|
if (access_process_vm(child, addr, &data, sizeof(data), 1)
|
|
== sizeof(data))
|
|
break;
|
|
ret = -EIO;
|
|
break;
|
|
|
|
case PTRACE_POKEUSR: {
|
|
struct pt_regs *regs;
|
|
ret = 0;
|
|
regs = (struct pt_regs *) ((unsigned long) child->thread_info +
|
|
THREAD_SIZE - 32 - sizeof(struct pt_regs));
|
|
|
|
switch (addr) {
|
|
case 0 ... 31:
|
|
regs->regs[addr] = data;
|
|
break;
|
|
case FPR_BASE ... FPR_BASE + 31: {
|
|
fpureg_t *fregs = get_fpu_regs(child);
|
|
|
|
if (!tsk_used_math(child)) {
|
|
/* FP not yet used */
|
|
memset(&child->thread.fpu.hard, ~0,
|
|
sizeof(child->thread.fpu.hard));
|
|
child->thread.fpu.hard.fcr31 = 0;
|
|
}
|
|
/*
|
|
* The odd registers are actually the high order bits
|
|
* of the values stored in the even registers - unless
|
|
* we're using r2k_switch.S.
|
|
*/
|
|
if (addr & 1) {
|
|
fregs[(addr & ~1) - FPR_BASE] &= 0xffffffff;
|
|
fregs[(addr & ~1) - FPR_BASE] |= ((unsigned long long) data) << 32;
|
|
} else {
|
|
fregs[addr - FPR_BASE] &= ~0xffffffffLL;
|
|
/* Must cast, lest sign extension fill upper
|
|
bits! */
|
|
fregs[addr - FPR_BASE] |= (unsigned int)data;
|
|
}
|
|
break;
|
|
}
|
|
case PC:
|
|
regs->cp0_epc = data;
|
|
break;
|
|
case MMHI:
|
|
regs->hi = data;
|
|
break;
|
|
case MMLO:
|
|
regs->lo = data;
|
|
break;
|
|
case FPC_CSR:
|
|
if (cpu_has_fpu)
|
|
child->thread.fpu.hard.fcr31 = data;
|
|
else
|
|
child->thread.fpu.soft.fcr31 = data;
|
|
break;
|
|
default:
|
|
/* The rest are not allowed. */
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
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_DETACH: /* detach a process that was attached. */
|
|
ret = ptrace_detach(child, data);
|
|
break;
|
|
|
|
case PTRACE_GETEVENTMSG:
|
|
ret = put_user(child->ptrace_message,
|
|
(unsigned int __user *) (unsigned long) data);
|
|
break;
|
|
|
|
default:
|
|
ret = ptrace_request(child, request, addr, data);
|
|
break;
|
|
}
|
|
|
|
out_tsk:
|
|
put_task_struct(child);
|
|
out:
|
|
unlock_kernel();
|
|
return ret;
|
|
}
|