Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
This commit is contained in:
Linus Torvalds
338
arch/mips/kernel/ptrace.c
Normal file
338
arch/mips/kernel/ptrace.c
Normal file
@@ -0,0 +1,338 @@
|
||||
/*
|
||||
* 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/config.h>
|
||||
#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/audit.h>
|
||||
#include <linux/smp.h>
|
||||
#include <linux/smp_lock.h>
|
||||
#include <linux/user.h>
|
||||
#include <linux/security.h>
|
||||
#include <linux/audit.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>
|
||||
|
||||
/*
|
||||
* Called by kernel/ptrace.c when detaching..
|
||||
*
|
||||
* Make sure single step bits etc are not set.
|
||||
*/
|
||||
void ptrace_disable(struct task_struct *child)
|
||||
{
|
||||
/* Nothing to do.. */
|
||||
}
|
||||
|
||||
asmlinkage int sys_ptrace(long request, long pid, long addr, long 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 long 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 long *) data);
|
||||
break;
|
||||
}
|
||||
|
||||
/* Read the word at location addr in the USER area. */
|
||||
case PTRACE_PEEKUSR: {
|
||||
struct pt_regs *regs;
|
||||
unsigned long tmp = 0;
|
||||
|
||||
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);
|
||||
|
||||
#ifdef CONFIG_MIPS32
|
||||
/*
|
||||
* 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);
|
||||
#endif
|
||||
#ifdef CONFIG_MIPS64
|
||||
tmp = fregs[addr - FPR_BASE];
|
||||
#endif
|
||||
} 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 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;
|
||||
}
|
||||
#ifdef CONFIG_MIPS32
|
||||
/*
|
||||
* 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;
|
||||
fregs[addr - FPR_BASE] |= data;
|
||||
}
|
||||
#endif
|
||||
#ifdef CONFIG_MIPS64
|
||||
fregs[addr - FPR_BASE] = data;
|
||||
#endif
|
||||
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 ((unsigned long) data > _NSIG)
|
||||
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;
|
||||
|
||||
default:
|
||||
ret = ptrace_request(child, request, addr, data);
|
||||
break;
|
||||
}
|
||||
|
||||
out_tsk:
|
||||
put_task_struct(child);
|
||||
out:
|
||||
unlock_kernel();
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* Notification of system call entry/exit
|
||||
* - triggered by current->work.syscall_trace
|
||||
*/
|
||||
asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
|
||||
{
|
||||
if (unlikely(current->audit_context)) {
|
||||
if (!entryexit)
|
||||
audit_syscall_entry(current, regs->regs[2],
|
||||
regs->regs[4], regs->regs[5],
|
||||
regs->regs[6], regs->regs[7]);
|
||||
else
|
||||
audit_syscall_exit(current, regs->regs[2]);
|
||||
}
|
||||
|
||||
if (!test_thread_flag(TIF_SYSCALL_TRACE))
|
||||
return;
|
||||
if (!(current->ptrace & PT_PTRACED))
|
||||
return;
|
||||
|
||||
/* The 0x80 provides a way for the tracing parent to distinguish
|
||||
between a syscall stop and SIGTRAP delivery */
|
||||
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;
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user