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x86: x86 ia32 ptrace arch merge
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This moves the sys32_ptrace code into arch/x86/kernel/ptrace.c,
verbatim except for a few hard-coded sizes replaced with sizeof.
Here this code can use the shared local functions in this file.

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Roland McGrath authored and Ingo Molnar committed Jan 30, 2008
1 parent cb757c4 commit 099cd6e
Showing 1 changed file with 214 additions and 0 deletions.
214 changes: 214 additions & 0 deletions arch/x86/kernel/ptrace.c
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Original file line number Diff line number Diff line change
Expand Up @@ -636,6 +636,10 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)

#ifdef CONFIG_IA32_EMULATION

#include <linux/compat.h>
#include <linux/syscalls.h>
#include <asm/ia32.h>
#include <asm/fpu32.h>
#include <asm/user32.h>

#define R32(l,q) \
Expand Down Expand Up @@ -758,6 +762,216 @@ static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
#undef R32
#undef SEG32

static long ptrace32_siginfo(unsigned request, u32 pid, u32 addr, u32 data)
{
siginfo_t __user *si = compat_alloc_user_space(sizeof(siginfo_t));
compat_siginfo_t __user *si32 = compat_ptr(data);
siginfo_t ssi;
int ret;

if (request == PTRACE_SETSIGINFO) {
memset(&ssi, 0, sizeof(siginfo_t));
ret = copy_siginfo_from_user32(&ssi, si32);
if (ret)
return ret;
if (copy_to_user(si, &ssi, sizeof(siginfo_t)))
return -EFAULT;
}
ret = sys_ptrace(request, pid, addr, (unsigned long)si);
if (ret)
return ret;
if (request == PTRACE_GETSIGINFO) {
if (copy_from_user(&ssi, si, sizeof(siginfo_t)))
return -EFAULT;
ret = copy_siginfo_to_user32(si32, &ssi);
}
return ret;
}

asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data)
{
struct task_struct *child;
struct pt_regs *childregs;
void __user *datap = compat_ptr(data);
int ret;
__u32 val;

switch (request) {
case PTRACE_TRACEME:
case PTRACE_ATTACH:
case PTRACE_KILL:
case PTRACE_CONT:
case PTRACE_SINGLESTEP:
case PTRACE_SINGLEBLOCK:
case PTRACE_DETACH:
case PTRACE_SYSCALL:
case PTRACE_OLDSETOPTIONS:
case PTRACE_SETOPTIONS:
case PTRACE_SET_THREAD_AREA:
case PTRACE_GET_THREAD_AREA:
return sys_ptrace(request, pid, addr, data);

default:
return -EINVAL;

case PTRACE_PEEKTEXT:
case PTRACE_PEEKDATA:
case PTRACE_POKEDATA:
case PTRACE_POKETEXT:
case PTRACE_POKEUSR:
case PTRACE_PEEKUSR:
case PTRACE_GETREGS:
case PTRACE_SETREGS:
case PTRACE_SETFPREGS:
case PTRACE_GETFPREGS:
case PTRACE_SETFPXREGS:
case PTRACE_GETFPXREGS:
case PTRACE_GETEVENTMSG:
break;

case PTRACE_SETSIGINFO:
case PTRACE_GETSIGINFO:
return ptrace32_siginfo(request, pid, addr, data);
}

child = ptrace_get_task_struct(pid);
if (IS_ERR(child))
return PTR_ERR(child);

ret = ptrace_check_attach(child, request == PTRACE_KILL);
if (ret < 0)
goto out;

childregs = task_pt_regs(child);

switch (request) {
case PTRACE_PEEKDATA:
case PTRACE_PEEKTEXT:
ret = 0;
if (access_process_vm(child, addr, &val, sizeof(u32), 0) !=
sizeof(u32))
ret = -EIO;
else
ret = put_user(val, (unsigned int __user *)datap);
break;

case PTRACE_POKEDATA:
case PTRACE_POKETEXT:
ret = 0;
if (access_process_vm(child, addr, &data, sizeof(u32), 1) !=
sizeof(u32))
ret = -EIO;
break;

case PTRACE_PEEKUSR:
ret = getreg32(child, addr, &val);
if (ret == 0)
ret = put_user(val, (__u32 __user *)datap);
break;

case PTRACE_POKEUSR:
ret = putreg32(child, addr, data);
break;

case PTRACE_GETREGS: { /* Get all gp regs from the child. */
int i;

if (!access_ok(VERIFY_WRITE, datap, 16*4)) {
ret = -EIO;
break;
}
ret = 0;
for (i = 0; i < sizeof(struct user_regs_struct32); i += sizeof(__u32)) {
getreg32(child, i, &val);
ret |= __put_user(val, (u32 __user *)datap);
datap += sizeof(u32);
}
break;
}

case PTRACE_SETREGS: { /* Set all gp regs in the child. */
unsigned long tmp;
int i;

if (!access_ok(VERIFY_READ, datap, 16*4)) {
ret = -EIO;
break;
}
ret = 0;
for (i = 0; i < sizeof(struct user_regs_struct32); i += sizeof(u32)) {
ret |= __get_user(tmp, (u32 __user *)datap);
putreg32(child, i, tmp);
datap += sizeof(u32);
}
break;
}

case PTRACE_GETFPREGS:
ret = -EIO;
if (!access_ok(VERIFY_READ, compat_ptr(data),
sizeof(struct user_i387_struct)))
break;
save_i387_ia32(child, datap, childregs, 1);
ret = 0;
break;

case PTRACE_SETFPREGS:
ret = -EIO;
if (!access_ok(VERIFY_WRITE, datap,
sizeof(struct user_i387_struct)))
break;
ret = 0;
/* don't check EFAULT to be bug-to-bug compatible to i386 */
restore_i387_ia32(child, datap, 1);
break;

case PTRACE_GETFPXREGS: {
struct user32_fxsr_struct __user *u = datap;

init_fpu(child);
ret = -EIO;
if (!access_ok(VERIFY_WRITE, u, sizeof(*u)))
break;
ret = -EFAULT;
if (__copy_to_user(u, &child->thread.i387.fxsave, sizeof(*u)))
break;
ret = __put_user(childregs->cs, &u->fcs);
ret |= __put_user(child->thread.ds, &u->fos);
break;
}
case PTRACE_SETFPXREGS: {
struct user32_fxsr_struct __user *u = datap;

unlazy_fpu(child);
ret = -EIO;
if (!access_ok(VERIFY_READ, u, sizeof(*u)))
break;
/*
* no checking to be bug-to-bug compatible with i386.
* but silence warning
*/
if (__copy_from_user(&child->thread.i387.fxsave, u, sizeof(*u)))
;
set_stopped_child_used_math(child);
child->thread.i387.fxsave.mxcsr &= mxcsr_feature_mask;
ret = 0;
break;
}

case PTRACE_GETEVENTMSG:
ret = put_user(child->ptrace_message,
(unsigned int __user *)compat_ptr(data));
break;

default:
BUG();
}

out:
put_task_struct(child);
return ret;
}

#endif /* CONFIG_IA32_EMULATION */

#ifdef CONFIG_X86_32
Expand Down

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