570 lines
13 KiB
C
570 lines
13 KiB
C
/*
|
|
* PowerPC version
|
|
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
|
|
*
|
|
* Derived from "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
|
|
*
|
|
* Modified by Cort Dougan (cort@hq.fsmlabs.com)
|
|
* and Paul Mackerras (paulus@samba.org).
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General
|
|
* Public License. See the file README.legal in the main directory of
|
|
* this archive for more details.
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/user.h>
|
|
#include <linux/security.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/seccomp.h>
|
|
#include <linux/audit.h>
|
|
#ifdef CONFIG_PPC32
|
|
#include <linux/module.h>
|
|
#endif
|
|
|
|
#include <asm/uaccess.h>
|
|
#include <asm/page.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/system.h>
|
|
|
|
#ifdef CONFIG_PPC64
|
|
#include "ptrace-common.h"
|
|
#endif
|
|
|
|
#ifdef CONFIG_PPC32
|
|
/*
|
|
* Set of msr bits that gdb can change on behalf of a process.
|
|
*/
|
|
#if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
|
|
#define MSR_DEBUGCHANGE 0
|
|
#else
|
|
#define MSR_DEBUGCHANGE (MSR_SE | MSR_BE)
|
|
#endif
|
|
#endif /* CONFIG_PPC32 */
|
|
|
|
/*
|
|
* does not yet catch signals sent when the child dies.
|
|
* in exit.c or in signal.c.
|
|
*/
|
|
|
|
#ifdef CONFIG_PPC32
|
|
/*
|
|
* Get contents of register REGNO in task TASK.
|
|
*/
|
|
static inline unsigned long get_reg(struct task_struct *task, int regno)
|
|
{
|
|
if (regno < sizeof(struct pt_regs) / sizeof(unsigned long)
|
|
&& task->thread.regs != NULL)
|
|
return ((unsigned long *)task->thread.regs)[regno];
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Write contents of register REGNO in task TASK.
|
|
*/
|
|
static inline int put_reg(struct task_struct *task, int regno,
|
|
unsigned long data)
|
|
{
|
|
if (regno <= PT_MQ && task->thread.regs != NULL) {
|
|
if (regno == PT_MSR)
|
|
data = (data & MSR_DEBUGCHANGE)
|
|
| (task->thread.regs->msr & ~MSR_DEBUGCHANGE);
|
|
((unsigned long *)task->thread.regs)[regno] = data;
|
|
return 0;
|
|
}
|
|
return -EIO;
|
|
}
|
|
|
|
#ifdef CONFIG_ALTIVEC
|
|
/*
|
|
* Get contents of AltiVec register state in task TASK
|
|
*/
|
|
static inline int get_vrregs(unsigned long __user *data, struct task_struct *task)
|
|
{
|
|
int i, j;
|
|
|
|
if (!access_ok(VERIFY_WRITE, data, 133 * sizeof(unsigned long)))
|
|
return -EFAULT;
|
|
|
|
/* copy AltiVec registers VR[0] .. VR[31] */
|
|
for (i = 0; i < 32; i++)
|
|
for (j = 0; j < 4; j++, data++)
|
|
if (__put_user(task->thread.vr[i].u[j], data))
|
|
return -EFAULT;
|
|
|
|
/* copy VSCR */
|
|
for (i = 0; i < 4; i++, data++)
|
|
if (__put_user(task->thread.vscr.u[i], data))
|
|
return -EFAULT;
|
|
|
|
/* copy VRSAVE */
|
|
if (__put_user(task->thread.vrsave, data))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Write contents of AltiVec register state into task TASK.
|
|
*/
|
|
static inline int set_vrregs(struct task_struct *task, unsigned long __user *data)
|
|
{
|
|
int i, j;
|
|
|
|
if (!access_ok(VERIFY_READ, data, 133 * sizeof(unsigned long)))
|
|
return -EFAULT;
|
|
|
|
/* copy AltiVec registers VR[0] .. VR[31] */
|
|
for (i = 0; i < 32; i++)
|
|
for (j = 0; j < 4; j++, data++)
|
|
if (__get_user(task->thread.vr[i].u[j], data))
|
|
return -EFAULT;
|
|
|
|
/* copy VSCR */
|
|
for (i = 0; i < 4; i++, data++)
|
|
if (__get_user(task->thread.vscr.u[i], data))
|
|
return -EFAULT;
|
|
|
|
/* copy VRSAVE */
|
|
if (__get_user(task->thread.vrsave, data))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_SPE
|
|
|
|
/*
|
|
* For get_evrregs/set_evrregs functions 'data' has the following layout:
|
|
*
|
|
* struct {
|
|
* u32 evr[32];
|
|
* u64 acc;
|
|
* u32 spefscr;
|
|
* }
|
|
*/
|
|
|
|
/*
|
|
* Get contents of SPE register state in task TASK.
|
|
*/
|
|
static inline int get_evrregs(unsigned long *data, struct task_struct *task)
|
|
{
|
|
int i;
|
|
|
|
if (!access_ok(VERIFY_WRITE, data, 35 * sizeof(unsigned long)))
|
|
return -EFAULT;
|
|
|
|
/* copy SPEFSCR */
|
|
if (__put_user(task->thread.spefscr, &data[34]))
|
|
return -EFAULT;
|
|
|
|
/* copy SPE registers EVR[0] .. EVR[31] */
|
|
for (i = 0; i < 32; i++, data++)
|
|
if (__put_user(task->thread.evr[i], data))
|
|
return -EFAULT;
|
|
|
|
/* copy ACC */
|
|
if (__put_user64(task->thread.acc, (unsigned long long *)data))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Write contents of SPE register state into task TASK.
|
|
*/
|
|
static inline int set_evrregs(struct task_struct *task, unsigned long *data)
|
|
{
|
|
int i;
|
|
|
|
if (!access_ok(VERIFY_READ, data, 35 * sizeof(unsigned long)))
|
|
return -EFAULT;
|
|
|
|
/* copy SPEFSCR */
|
|
if (__get_user(task->thread.spefscr, &data[34]))
|
|
return -EFAULT;
|
|
|
|
/* copy SPE registers EVR[0] .. EVR[31] */
|
|
for (i = 0; i < 32; i++, data++)
|
|
if (__get_user(task->thread.evr[i], data))
|
|
return -EFAULT;
|
|
/* copy ACC */
|
|
if (__get_user64(task->thread.acc, (unsigned long long*)data))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_SPE */
|
|
|
|
static inline void
|
|
set_single_step(struct task_struct *task)
|
|
{
|
|
struct pt_regs *regs = task->thread.regs;
|
|
|
|
if (regs != NULL) {
|
|
#if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
|
|
task->thread.dbcr0 = DBCR0_IDM | DBCR0_IC;
|
|
regs->msr |= MSR_DE;
|
|
#else
|
|
regs->msr |= MSR_SE;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
clear_single_step(struct task_struct *task)
|
|
{
|
|
struct pt_regs *regs = task->thread.regs;
|
|
|
|
if (regs != NULL) {
|
|
#if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
|
|
task->thread.dbcr0 = 0;
|
|
regs->msr &= ~MSR_DE;
|
|
#else
|
|
regs->msr &= ~MSR_SE;
|
|
#endif
|
|
}
|
|
}
|
|
#endif /* CONFIG_PPC32 */
|
|
|
|
/*
|
|
* Called by kernel/ptrace.c when detaching..
|
|
*
|
|
* Make sure single step bits etc are not set.
|
|
*/
|
|
void ptrace_disable(struct task_struct *child)
|
|
{
|
|
/* make sure the single step bit is not set. */
|
|
clear_single_step(child);
|
|
}
|
|
|
|
long arch_ptrace(struct task_struct *child, long request, long addr, long data)
|
|
{
|
|
int ret = -EPERM;
|
|
|
|
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 __user *) data);
|
|
break;
|
|
}
|
|
|
|
/* read the word at location addr in the USER area. */
|
|
case PTRACE_PEEKUSR: {
|
|
unsigned long index, tmp;
|
|
|
|
ret = -EIO;
|
|
/* convert to index and check */
|
|
#ifdef CONFIG_PPC32
|
|
index = (unsigned long) addr >> 2;
|
|
if ((addr & 3) || (index > PT_FPSCR)
|
|
|| (child->thread.regs == NULL))
|
|
#else
|
|
index = (unsigned long) addr >> 3;
|
|
if ((addr & 7) || (index > PT_FPSCR))
|
|
#endif
|
|
break;
|
|
|
|
#ifdef CONFIG_PPC32
|
|
CHECK_FULL_REGS(child->thread.regs);
|
|
#endif
|
|
if (index < PT_FPR0) {
|
|
tmp = get_reg(child, (int) index);
|
|
} else {
|
|
flush_fp_to_thread(child);
|
|
tmp = ((unsigned long *)child->thread.fpr)[index - PT_FPR0];
|
|
}
|
|
ret = put_user(tmp,(unsigned long __user *) data);
|
|
break;
|
|
}
|
|
|
|
/* If 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;
|
|
|
|
/* write the word at location addr in the USER area */
|
|
case PTRACE_POKEUSR: {
|
|
unsigned long index;
|
|
|
|
ret = -EIO;
|
|
/* convert to index and check */
|
|
#ifdef CONFIG_PPC32
|
|
index = (unsigned long) addr >> 2;
|
|
if ((addr & 3) || (index > PT_FPSCR)
|
|
|| (child->thread.regs == NULL))
|
|
#else
|
|
index = (unsigned long) addr >> 3;
|
|
if ((addr & 7) || (index > PT_FPSCR))
|
|
#endif
|
|
break;
|
|
|
|
#ifdef CONFIG_PPC32
|
|
CHECK_FULL_REGS(child->thread.regs);
|
|
#endif
|
|
if (index == PT_ORIG_R3)
|
|
break;
|
|
if (index < PT_FPR0) {
|
|
ret = put_reg(child, index, data);
|
|
} else {
|
|
flush_fp_to_thread(child);
|
|
((unsigned long *)child->thread.fpr)[index - PT_FPR0] = data;
|
|
ret = 0;
|
|
}
|
|
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;
|
|
/* make sure the single step bit is not set. */
|
|
clear_single_step(child);
|
|
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;
|
|
/* make sure the single step bit is not set. */
|
|
clear_single_step(child);
|
|
wake_up_process(child);
|
|
break;
|
|
}
|
|
|
|
case PTRACE_SINGLESTEP: { /* set the trap flag. */
|
|
ret = -EIO;
|
|
if (!valid_signal(data))
|
|
break;
|
|
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
|
|
set_single_step(child);
|
|
child->exit_code = data;
|
|
/* give it a chance to run. */
|
|
wake_up_process(child);
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
#ifdef CONFIG_PPC64
|
|
case PTRACE_GET_DEBUGREG: {
|
|
ret = -EINVAL;
|
|
/* We only support one DABR and no IABRS at the moment */
|
|
if (addr > 0)
|
|
break;
|
|
ret = put_user(child->thread.dabr,
|
|
(unsigned long __user *)data);
|
|
break;
|
|
}
|
|
|
|
case PTRACE_SET_DEBUGREG:
|
|
ret = ptrace_set_debugreg(child, addr, data);
|
|
break;
|
|
#endif
|
|
|
|
case PTRACE_DETACH:
|
|
ret = ptrace_detach(child, data);
|
|
break;
|
|
|
|
case PPC_PTRACE_GETREGS: { /* Get GPRs 0 - 31. */
|
|
int i;
|
|
unsigned long *reg = &((unsigned long *)child->thread.regs)[0];
|
|
unsigned long __user *tmp = (unsigned long __user *)addr;
|
|
|
|
for (i = 0; i < 32; i++) {
|
|
ret = put_user(*reg, tmp);
|
|
if (ret)
|
|
break;
|
|
reg++;
|
|
tmp++;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case PPC_PTRACE_SETREGS: { /* Set GPRs 0 - 31. */
|
|
int i;
|
|
unsigned long *reg = &((unsigned long *)child->thread.regs)[0];
|
|
unsigned long __user *tmp = (unsigned long __user *)addr;
|
|
|
|
for (i = 0; i < 32; i++) {
|
|
ret = get_user(*reg, tmp);
|
|
if (ret)
|
|
break;
|
|
reg++;
|
|
tmp++;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case PPC_PTRACE_GETFPREGS: { /* Get FPRs 0 - 31. */
|
|
int i;
|
|
unsigned long *reg = &((unsigned long *)child->thread.fpr)[0];
|
|
unsigned long __user *tmp = (unsigned long __user *)addr;
|
|
|
|
flush_fp_to_thread(child);
|
|
|
|
for (i = 0; i < 32; i++) {
|
|
ret = put_user(*reg, tmp);
|
|
if (ret)
|
|
break;
|
|
reg++;
|
|
tmp++;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case PPC_PTRACE_SETFPREGS: { /* Get FPRs 0 - 31. */
|
|
int i;
|
|
unsigned long *reg = &((unsigned long *)child->thread.fpr)[0];
|
|
unsigned long __user *tmp = (unsigned long __user *)addr;
|
|
|
|
flush_fp_to_thread(child);
|
|
|
|
for (i = 0; i < 32; i++) {
|
|
ret = get_user(*reg, tmp);
|
|
if (ret)
|
|
break;
|
|
reg++;
|
|
tmp++;
|
|
}
|
|
break;
|
|
}
|
|
|
|
#ifdef CONFIG_ALTIVEC
|
|
case PTRACE_GETVRREGS:
|
|
/* Get the child altivec register state. */
|
|
flush_altivec_to_thread(child);
|
|
ret = get_vrregs((unsigned long __user *)data, child);
|
|
break;
|
|
|
|
case PTRACE_SETVRREGS:
|
|
/* Set the child altivec register state. */
|
|
flush_altivec_to_thread(child);
|
|
ret = set_vrregs(child, (unsigned long __user *)data);
|
|
break;
|
|
#endif
|
|
#ifdef CONFIG_SPE
|
|
case PTRACE_GETEVRREGS:
|
|
/* Get the child spe register state. */
|
|
if (child->thread.regs->msr & MSR_SPE)
|
|
giveup_spe(child);
|
|
ret = get_evrregs((unsigned long __user *)data, child);
|
|
break;
|
|
|
|
case PTRACE_SETEVRREGS:
|
|
/* Set the child spe register state. */
|
|
/* this is to clear the MSR_SPE bit to force a reload
|
|
* of register state from memory */
|
|
if (child->thread.regs->msr & MSR_SPE)
|
|
giveup_spe(child);
|
|
ret = set_evrregs(child, (unsigned long __user *)data);
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
ret = ptrace_request(child, request, addr, data);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void do_syscall_trace(void)
|
|
{
|
|
/* 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;
|
|
}
|
|
}
|
|
|
|
void do_syscall_trace_enter(struct pt_regs *regs)
|
|
{
|
|
#ifdef CONFIG_PPC64
|
|
secure_computing(regs->gpr[0]);
|
|
#endif
|
|
|
|
if (test_thread_flag(TIF_SYSCALL_TRACE)
|
|
&& (current->ptrace & PT_PTRACED))
|
|
do_syscall_trace();
|
|
|
|
if (unlikely(current->audit_context))
|
|
audit_syscall_entry(
|
|
#ifdef CONFIG_PPC32
|
|
AUDIT_ARCH_PPC,
|
|
#else
|
|
test_thread_flag(TIF_32BIT)?AUDIT_ARCH_PPC:AUDIT_ARCH_PPC64,
|
|
#endif
|
|
regs->gpr[0],
|
|
regs->gpr[3], regs->gpr[4],
|
|
regs->gpr[5], regs->gpr[6]);
|
|
}
|
|
|
|
void do_syscall_trace_leave(struct pt_regs *regs)
|
|
{
|
|
#ifdef CONFIG_PPC32
|
|
secure_computing(regs->gpr[0]);
|
|
#endif
|
|
|
|
if (unlikely(current->audit_context))
|
|
audit_syscall_exit((regs->ccr&0x1000)?AUDITSC_FAILURE:AUDITSC_SUCCESS,
|
|
regs->result);
|
|
|
|
if ((test_thread_flag(TIF_SYSCALL_TRACE)
|
|
|| test_thread_flag(TIF_SINGLESTEP))
|
|
&& (current->ptrace & PT_PTRACED))
|
|
do_syscall_trace();
|
|
}
|
|
|
|
#ifdef CONFIG_PPC32
|
|
EXPORT_SYMBOL(do_syscall_trace_enter);
|
|
EXPORT_SYMBOL(do_syscall_trace_leave);
|
|
#endif
|