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x86: x86-64 ia32 ptrace pt_regs cleanup

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This cleans up the getreg32/putreg32 functions to use struct pt_regs in a
straightforward fashion, instead of equivalent ugly pointer arithmetic.

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 13:30:57 +01:00 committed by Ingo Molnar
parent 35d0991ffa
commit ff14c6164b
1 changed files with 9 additions and 12 deletions
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21
arch/x86/ia32/ptrace32.c
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@ -37,11 +37,11 @@
#define R32(l,q) \
case offsetof(struct user32, regs.l): \
stack[offsetof(struct pt_regs, q) / 8] = val; break
regs->q = val; break;
static int putreg32(struct task_struct *child, unsigned regno, u32 val)
{
__u64 *stack = (__u64 *)task_pt_regs(child);
struct pt_regs *regs = task_pt_regs(child);
switch (regno) {
case offsetof(struct user32, regs.fs):
@ -65,12 +65,12 @@ static int putreg32(struct task_struct *child, unsigned regno, u32 val)
case offsetof(struct user32, regs.ss):
if ((val & 3) != 3)
return -EIO;
stack[offsetof(struct pt_regs, ss)/8] = val & 0xffff;
regs->ss = val & 0xffff;
break;
case offsetof(struct user32, regs.cs):
if ((val & 3) != 3)
return -EIO;
stack[offsetof(struct pt_regs, cs)/8] = val & 0xffff;
regs->cs = val & 0xffff;
break;
R32(ebx, bx);
@ -84,9 +84,7 @@ static int putreg32(struct task_struct *child, unsigned regno, u32 val)
R32(eip, ip);
R32(esp, sp);
case offsetof(struct user32, regs.eflags): {
__u64 *flags = &stack[offsetof(struct pt_regs, flags)/8];
case offsetof(struct user32, regs.eflags):
val &= FLAG_MASK;
/*
* If the user value contains TF, mark that
@ -97,9 +95,8 @@ static int putreg32(struct task_struct *child, unsigned regno, u32 val)
clear_tsk_thread_flag(child, TIF_FORCED_TF);
else if (test_tsk_thread_flag(child, TIF_FORCED_TF))
val |= X86_EFLAGS_TF;
*flags = val | (*flags & ~FLAG_MASK);
regs->flags = val | (regs->flags & ~FLAG_MASK);
break;
}
case offsetof(struct user32, u_debugreg[0]) ...
offsetof(struct user32, u_debugreg[7]):
@ -123,11 +120,11 @@ static int putreg32(struct task_struct *child, unsigned regno, u32 val)
#define R32(l,q) \
case offsetof(struct user32, regs.l): \
*val = stack[offsetof(struct pt_regs, q)/8]; break
*val = regs->q; break
static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
{
__u64 *stack = (__u64 *)task_pt_regs(child);
struct pt_regs *regs = task_pt_regs(child);
switch (regno) {
case offsetof(struct user32, regs.fs):
@ -160,7 +157,7 @@ static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
/*
* If the debugger set TF, hide it from the readout.
*/
*val = stack[offsetof(struct pt_regs, flags)/8];
*val = regs->flags;
if (test_tsk_thread_flag(child, TIF_FORCED_TF))
*val &= ~X86_EFLAGS_TF;
break;