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parisc: convert to generic compat_sys_ptrace

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This patch does the compat_sys_ptrace conversion for parisc.
In addition it does convert the parisc ptrace code to use the
architecture-independent ptrace infrastructure instead of own coding.

Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
This commit is contained in:
Helge Deller 2008-10-17 18:48:36 +00:00 committed by Kyle McMartin
parent 9eb1686423
commit 81e192d6ce
3 changed files with 183 additions and 258 deletions
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10
arch/parisc/include/asm/ptrace.h
View File

@ -47,6 +47,16 @@ struct pt_regs {
#define task_regs(task) ((struct pt_regs *) ((char *)(task) + TASK_REGS))
#define __ARCH_WANT_COMPAT_SYS_PTRACE
struct task_struct;
#define arch_has_single_step() 1
void user_disable_single_step(struct task_struct *task);
void user_enable_single_step(struct task_struct *task);
#define arch_has_block_step() 1
void user_enable_block_step(struct task_struct *task);
/* XXX should we use iaoq[1] or iaoq[0] ? */
#define user_mode(regs) (((regs)->iaoq[0] & 3) ? 1 : 0)
#define user_space(regs) (((regs)->iasq[1] != 0) ? 1 : 0)

429
arch/parisc/kernel/ptrace.c
View File

@ -4,6 +4,7 @@
* Copyright (C) 2000 Hewlett-Packard Co, Linuxcare Inc.
* Copyright (C) 2000 Matthew Wilcox <matthew@wil.cx>
* Copyright (C) 2000 David Huggins-Daines <dhd@debian.org>
* Copyright (C) 2008 Helge Deller <deller@gmx.de>
*/
#include <linux/kernel.h>
@ -27,15 +28,149 @@
/* PSW bits we allow the debugger to modify */
#define USER_PSW_BITS (PSW_N | PSW_V | PSW_CB)
#undef DEBUG_PTRACE
/*
* Called by kernel/ptrace.c when detaching..
*
* Make sure single step bits etc are not set.
*/
void ptrace_disable(struct task_struct *task)
{
task->ptrace &= ~(PT_SINGLESTEP|PT_BLOCKSTEP);
#ifdef DEBUG_PTRACE
#define DBG(x...) printk(x)
#else
#define DBG(x...)
#endif
/* make sure the trap bits are not set */
pa_psw(task)->r = 0;
pa_psw(task)->t = 0;
pa_psw(task)->h = 0;
pa_psw(task)->l = 0;
}
#ifdef CONFIG_64BIT
/*
* The following functions are called by ptrace_resume() when
* enabling or disabling single/block tracing.
*/
void user_disable_single_step(struct task_struct *task)
{
ptrace_disable(task);
}
void user_enable_single_step(struct task_struct *task)
{
task->ptrace &= ~PT_BLOCKSTEP;
task->ptrace |= PT_SINGLESTEP;
if (pa_psw(task)->n) {
struct siginfo si;
/* Nullified, just crank over the queue. */
task_regs(task)->iaoq[0] = task_regs(task)->iaoq[1];
task_regs(task)->iasq[0] = task_regs(task)->iasq[1];
task_regs(task)->iaoq[1] = task_regs(task)->iaoq[0] + 4;
pa_psw(task)->n = 0;
pa_psw(task)->x = 0;
pa_psw(task)->y = 0;
pa_psw(task)->z = 0;
pa_psw(task)->b = 0;
ptrace_disable(task);
/* Don't wake up the task, but let the
parent know something happened. */
si.si_code = TRAP_TRACE;
si.si_addr = (void __user *) (task_regs(task)->iaoq[0] & ~3);
si.si_signo = SIGTRAP;
si.si_errno = 0;
force_sig_info(SIGTRAP, &si, task);
/* notify_parent(task, SIGCHLD); */
return;
}
/* Enable recovery counter traps. The recovery counter
* itself will be set to zero on a task switch. If the
* task is suspended on a syscall then the syscall return
* path will overwrite the recovery counter with a suitable
* value such that it traps once back in user space. We
* disable interrupts in the tasks PSW here also, to avoid
* interrupts while the recovery counter is decrementing.
*/
pa_psw(task)->r = 1;
pa_psw(task)->t = 0;
pa_psw(task)->h = 0;
pa_psw(task)->l = 0;
}
void user_enable_block_step(struct task_struct *task)
{
task->ptrace &= ~PT_SINGLESTEP;
task->ptrace |= PT_BLOCKSTEP;
/* Enable taken branch trap. */
pa_psw(task)->r = 0;
pa_psw(task)->t = 1;
pa_psw(task)->h = 0;
pa_psw(task)->l = 0;
}
long arch_ptrace(struct task_struct *child, long request, long addr, long data)
{
unsigned long tmp;
long ret = -EIO;
switch (request) {
/* Read the word at location addr in the USER area. For ptraced
processes, the kernel saves all regs on a syscall. */
case PTRACE_PEEKUSR:
if ((addr & (sizeof(long)-1)) ||
(unsigned long) addr >= sizeof(struct pt_regs))
break;
tmp = *(unsigned long *) ((char *) task_regs(child) + addr);
ret = put_user(tmp, (unsigned long *) data);
break;
/* Write the word at location addr in the USER area. This will need
to change when the kernel no longer saves all regs on a syscall.
FIXME. There is a problem at the moment in that r3-r18 are only
saved if the process is ptraced on syscall entry, and even then
those values are overwritten by actual register values on syscall
exit. */
case PTRACE_POKEUSR:
/* Some register values written here may be ignored in
* entry.S:syscall_restore_rfi; e.g. iaoq is written with
* r31/r31+4, and not with the values in pt_regs.
*/
if (addr == PT_PSW) {
/* Allow writing to Nullify, Divide-step-correction,
* and carry/borrow bits.
* BEWARE, if you set N, and then single step, it won't
* stop on the nullified instruction.
*/
data &= USER_PSW_BITS;
task_regs(child)->gr[0] &= ~USER_PSW_BITS;
task_regs(child)->gr[0] |= data;
ret = 0;
break;
}
if ((addr & (sizeof(long)-1)) ||
(unsigned long) addr >= sizeof(struct pt_regs))
break;
if ((addr >= PT_GR1 && addr <= PT_GR31) ||
addr == PT_IAOQ0 || addr == PT_IAOQ1 ||
(addr >= PT_FR0 && addr <= PT_FR31 + 4) ||
addr == PT_SAR) {
*(unsigned long *) ((char *) task_regs(child) + addr) = data;
ret = 0;
}
break;
default:
ret = ptrace_request(child, request, addr, data);
break;
}
return ret;
}
#ifdef CONFIG_COMPAT
/* This function is needed to translate 32 bit pt_regs offsets in to
* 64 bit pt_regs offsets. For example, a 32 bit gdb under a 64 bit kernel
@ -61,106 +196,25 @@ static long translate_usr_offset(long offset)
else
return -1;
}
#endif
/*
* Called by kernel/ptrace.c when detaching..
*
* Make sure single step bits etc are not set.
*/
void ptrace_disable(struct task_struct *child)
long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
compat_ulong_t addr, compat_ulong_t data)
{
/* make sure the trap bits are not set */
pa_psw(child)->r = 0;
pa_psw(child)->t = 0;
pa_psw(child)->h = 0;
pa_psw(child)->l = 0;
}
long arch_ptrace(struct task_struct *child, long request, long addr, long data)
{
long ret;
#ifdef DEBUG_PTRACE
long oaddr=addr, odata=data;
#endif
compat_uint_t tmp;
long ret = -EIO;
switch (request) {
case PTRACE_PEEKTEXT: /* read word at location addr. */
case PTRACE_PEEKDATA: {
#ifdef CONFIG_64BIT
if (__is_compat_task(child)) {
int copied;
unsigned int tmp;
addr &= 0xffffffffL;
copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
ret = -EIO;
if (copied != sizeof(tmp))
goto out_tsk;
ret = put_user(tmp,(unsigned int *) data);
DBG("sys_ptrace(PEEK%s, %d, %lx, %lx) returning %ld, data %x\n",
request == PTRACE_PEEKTEXT ? "TEXT" : "DATA",
pid, oaddr, odata, ret, tmp);
}
else
#endif
ret = generic_ptrace_peekdata(child, addr, data);
goto out_tsk;
}
case PTRACE_PEEKUSR:
if (addr & (sizeof(compat_uint_t)-1))
break;
addr = translate_usr_offset(addr);
if (addr < 0)
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;
#ifdef CONFIG_64BIT
if (__is_compat_task(child)) {
unsigned int tmp = (unsigned int)data;
DBG("sys_ptrace(POKE%s, %d, %lx, %lx)\n",
request == PTRACE_POKETEXT ? "TEXT" : "DATA",
pid, oaddr, odata);
addr &= 0xffffffffL;
if (access_process_vm(child, addr, &tmp, sizeof(tmp), 1) == sizeof(tmp))
goto out_tsk;
}
else
#endif
{
if (access_process_vm(child, addr, &data, sizeof(data), 1) == sizeof(data))
goto out_tsk;
}
ret = -EIO;
goto out_tsk;
/* Read the word at location addr in the USER area. For ptraced
processes, the kernel saves all regs on a syscall. */
case PTRACE_PEEKUSR: {
ret = -EIO;
#ifdef CONFIG_64BIT
if (__is_compat_task(child)) {
unsigned int tmp;
if (addr & (sizeof(int)-1))
goto out_tsk;
if ((addr = translate_usr_offset(addr)) < 0)
goto out_tsk;
tmp = *(unsigned int *) ((char *) task_regs(child) + addr);
ret = put_user(tmp, (unsigned int *) data);
DBG("sys_ptrace(PEEKUSR, %d, %lx, %lx) returning %ld, addr %lx, data %x\n",
pid, oaddr, odata, ret, addr, tmp);
}
else
#endif
{
unsigned long tmp;
if ((addr & (sizeof(long)-1)) || (unsigned long) addr >= sizeof(struct pt_regs))
goto out_tsk;
tmp = *(unsigned long *) ((char *) task_regs(child) + addr);
ret = put_user(tmp, (unsigned long *) data);
}
goto out_tsk;
}
tmp = *(compat_uint_t *) ((char *) task_regs(child) + addr);
ret = put_user(tmp, (compat_uint_t *) (unsigned long) data);
break;
/* Write the word at location addr in the USER area. This will need
to change when the kernel no longer saves all regs on a syscall.
@ -169,185 +223,46 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
those values are overwritten by actual register values on syscall
exit. */
case PTRACE_POKEUSR:
ret = -EIO;
/* Some register values written here may be ignored in
* entry.S:syscall_restore_rfi; e.g. iaoq is written with
* r31/r31+4, and not with the values in pt_regs.
*/
/* PT_PSW=0, so this is valid for 32 bit processes under 64
* bit kernels.
*/
if (addr == PT_PSW) {
/* PT_PSW=0, so this is valid for 32 bit processes
* under 64 bit kernels.
*
* Allow writing to Nullify, Divide-step-correction,
* and carry/borrow bits.
* BEWARE, if you set N, and then single step, it won't
* stop on the nullified instruction.
/* Since PT_PSW==0, it is valid for 32 bit processes
* under 64 bit kernels as well.
*/
DBG("sys_ptrace(POKEUSR, %d, %lx, %lx)\n",
pid, oaddr, odata);
data &= USER_PSW_BITS;
task_regs(child)->gr[0] &= ~USER_PSW_BITS;
task_regs(child)->gr[0] |= data;
ret = 0;
goto out_tsk;
}
#ifdef CONFIG_64BIT
if (__is_compat_task(child)) {
if (addr & (sizeof(int)-1))
goto out_tsk;
if ((addr = translate_usr_offset(addr)) < 0)
goto out_tsk;
DBG("sys_ptrace(POKEUSR, %d, %lx, %lx) addr %lx\n",
pid, oaddr, odata, addr);
ret = arch_ptrace(child, request, addr, data);
} else {
if (addr & (sizeof(compat_uint_t)-1))
break;
addr = translate_usr_offset(addr);
if (addr < 0)
break;
if (addr >= PT_FR0 && addr <= PT_FR31 + 4) {
/* Special case, fp regs are 64 bits anyway */
*(unsigned int *) ((char *) task_regs(child) + addr) = data;
*(__u64 *) ((char *) task_regs(child) + addr) = data;
ret = 0;
}
else if ((addr >= PT_GR1+4 && addr <= PT_GR31+4) ||
addr == PT_IAOQ0+4 || addr == PT_IAOQ1+4 ||
addr == PT_SAR+4) {
/* Zero the top 32 bits */
*(unsigned int *) ((char *) task_regs(child) + addr - 4) = 0;
*(unsigned int *) ((char *) task_regs(child) + addr) = data;
*(__u32 *) ((char *) task_regs(child) + addr - 4) = 0;
*(__u32 *) ((char *) task_regs(child) + addr) = data;
ret = 0;
}
goto out_tsk;
}
else
#endif
{
if ((addr & (sizeof(long)-1)) || (unsigned long) addr >= sizeof(struct pt_regs))
goto out_tsk;
if ((addr >= PT_GR1 && addr <= PT_GR31) ||
addr == PT_IAOQ0 || addr == PT_IAOQ1 ||
(addr >= PT_FR0 && addr <= PT_FR31 + 4) ||
addr == PT_SAR) {
*(unsigned long *) ((char *) task_regs(child) + addr) = data;
ret = 0;
}
goto out_tsk;
}
case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
case PTRACE_CONT:
ret = -EIO;
DBG("sys_ptrace(%s)\n",
request == PTRACE_SYSCALL ? "SYSCALL" : "CONT");
if (!valid_signal(data))
goto out_tsk;
child->ptrace &= ~(PT_SINGLESTEP|PT_BLOCKSTEP);
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;
goto out_wake_notrap;
case PTRACE_KILL:
/*
* 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.
*/
ret = 0;
DBG("sys_ptrace(KILL)\n");
if (child->exit_state == EXIT_ZOMBIE) /* already dead */
goto out_tsk;
child->exit_code = SIGKILL;
goto out_wake_notrap;
case PTRACE_SINGLEBLOCK:
DBG("sys_ptrace(SINGLEBLOCK)\n");
ret = -EIO;
if (!valid_signal(data))
goto out_tsk;
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
child->ptrace &= ~PT_SINGLESTEP;
child->ptrace |= PT_BLOCKSTEP;
child->exit_code = data;
/* Enable taken branch trap. */
pa_psw(child)->r = 0;
pa_psw(child)->t = 1;
pa_psw(child)->h = 0;
pa_psw(child)->l = 0;
goto out_wake;
case PTRACE_SINGLESTEP:
DBG("sys_ptrace(SINGLESTEP)\n");
ret = -EIO;
if (!valid_signal(data))
goto out_tsk;
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
child->ptrace &= ~PT_BLOCKSTEP;
child->ptrace |= PT_SINGLESTEP;
child->exit_code = data;
if (pa_psw(child)->n) {
struct siginfo si;
/* Nullified, just crank over the queue. */
task_regs(child)->iaoq[0] = task_regs(child)->iaoq[1];
task_regs(child)->iasq[0] = task_regs(child)->iasq[1];
task_regs(child)->iaoq[1] = task_regs(child)->iaoq[0] + 4;
pa_psw(child)->n = 0;
pa_psw(child)->x = 0;
pa_psw(child)->y = 0;
pa_psw(child)->z = 0;
pa_psw(child)->b = 0;
ptrace_disable(child);
/* Don't wake up the child, but let the
parent know something happened. */
si.si_code = TRAP_TRACE;
si.si_addr = (void __user *) (task_regs(child)->iaoq[0] & ~3);
si.si_signo = SIGTRAP;
si.si_errno = 0;
force_sig_info(SIGTRAP, &si, child);
//notify_parent(child, SIGCHLD);
//ret = 0;
goto out_wake;
}
/* Enable recovery counter traps. The recovery counter
* itself will be set to zero on a task switch. If the
* task is suspended on a syscall then the syscall return
* path will overwrite the recovery counter with a suitable
* value such that it traps once back in user space. We
* disable interrupts in the childs PSW here also, to avoid
* interrupts while the recovery counter is decrementing.
*/
pa_psw(child)->r = 1;
pa_psw(child)->t = 0;
pa_psw(child)->h = 0;
pa_psw(child)->l = 0;
/* give it a chance to run. */
goto out_wake;
case PTRACE_GETEVENTMSG:
ret = put_user(child->ptrace_message, (unsigned int __user *) data);
goto out_tsk;
break;
default:
ret = ptrace_request(child, request, addr, data);
goto out_tsk;
ret = compat_ptrace_request(child, request, addr, data);
break;
}
out_wake_notrap:
ptrace_disable(child);
out_wake:
wake_up_process(child);
ret = 0;
out_tsk:
DBG("arch_ptrace(%ld, %d, %lx, %lx) returning %ld\n",
request, pid, oaddr, odata, ret);
return ret;
}
#endif
void syscall_trace(void)
{

2
arch/parisc/kernel/syscall_table.S
View File

@ -87,7 +87,7 @@
ENTRY_SAME(setuid)
ENTRY_SAME(getuid)
ENTRY_COMP(stime) /* 25 */
ENTRY_SAME(ptrace)
ENTRY_COMP(ptrace)
ENTRY_SAME(alarm)
/* see stat comment */
ENTRY_COMP(newfstat)