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x86: x86-64 ia32 ptrace debugreg cleanup 

This cleans up the ia32 compat ptrace code to use shared code from
native ptrace for the implementation guts of debug register access.

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Roland McGrath 2008-01-30 13:30:52 +01:00 committed by Ingo Molnar
parent 962ff3804d
commit d0f0817582
1 changed files with 8 additions and 55 deletions
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63
arch/x86/ia32/ptrace32.c
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@ -41,7 +41,6 @@
static int putreg32(struct task_struct *child, unsigned regno, u32 val)
{
int i;
__u64 *stack = (__u64 *)task_pt_regs(child);
switch (regno) {
@ -102,43 +101,10 @@ static int putreg32(struct task_struct *child, unsigned regno, u32 val)
break;
}
case offsetof(struct user32, u_debugreg[4]):
case offsetof(struct user32, u_debugreg[5]):
return -EIO;
case offsetof(struct user32, u_debugreg[0]):
child->thread.debugreg0 = val;
break;
case offsetof(struct user32, u_debugreg[1]):
child->thread.debugreg1 = val;
break;
case offsetof(struct user32, u_debugreg[2]):
child->thread.debugreg2 = val;
break;
case offsetof(struct user32, u_debugreg[3]):
child->thread.debugreg3 = val;
break;
case offsetof(struct user32, u_debugreg[6]):
child->thread.debugreg6 = val;
break;
case offsetof(struct user32, u_debugreg[7]):
val &= ~DR_CONTROL_RESERVED;
/* See arch/i386/kernel/ptrace.c for an explanation of
* this awkward check.*/
for (i = 0; i < 4; i++)
if ((0x5454 >> ((val >> (16 + 4*i)) & 0xf)) & 1)
return -EIO;
child->thread.debugreg7 = val;
if (val)
set_tsk_thread_flag(child, TIF_DEBUG);
else
clear_tsk_thread_flag(child, TIF_DEBUG);
break;
case offsetof(struct user32, u_debugreg[0]) ...
offsetof(struct user32, u_debugreg[7]):
regno -= offsetof(struct user32, u_debugreg[0]);
return ptrace_set_debugreg(child, regno / 4, val);
default:
if (regno > sizeof(struct user32) || (regno & 3))
@ -199,23 +165,10 @@ static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
*val &= ~X86_EFLAGS_TF;
break;
case offsetof(struct user32, u_debugreg[0]):
*val = child->thread.debugreg0;
break;
case offsetof(struct user32, u_debugreg[1]):
*val = child->thread.debugreg1;
break;
case offsetof(struct user32, u_debugreg[2]):
*val = child->thread.debugreg2;
break;
case offsetof(struct user32, u_debugreg[3]):
*val = child->thread.debugreg3;
break;
case offsetof(struct user32, u_debugreg[6]):
*val = child->thread.debugreg6;
break;
case offsetof(struct user32, u_debugreg[7]):
*val = child->thread.debugreg7;
case offsetof(struct user32, u_debugreg[0]) ...
offsetof(struct user32, u_debugreg[7]):
regno -= offsetof(struct user32, u_debugreg[0]);
*val = ptrace_get_debugreg(child, regno / 4);
break;
default: