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x86: x86-64 ia32 ptrace get/putreg32 current task

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This generalizes the getreg32 and putreg32 functions so they can be used on
the current task, as well as on a task stopped in TASK_TRACED and switched
off.  This lays the groundwork to share this code for all kinds of
user-mode machine state access, not just ptrace.

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 13:30:58 +01:00 committed by Ingo Molnar
parent 5fd4d16bd5
commit d277fb89df
1 changed files with 16 additions and 0 deletions
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16
arch/x86/ia32/ptrace32.c
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@ -48,19 +48,27 @@ static int putreg32(struct task_struct *child, unsigned regno, u32 val)
if (val && (val & 3) != 3)
return -EIO;
child->thread.fsindex = val & 0xffff;
if (child == current)
loadsegment(fs, child->thread.fsindex);
break;
case offsetof(struct user32, regs.gs):
if (val && (val & 3) != 3)
return -EIO;
child->thread.gsindex = val & 0xffff;
if (child == current)
load_gs_index(child->thread.gsindex);
break;
case offsetof(struct user32, regs.ds):
if (val && (val & 3) != 3)
return -EIO;
child->thread.ds = val & 0xffff;
if (child == current)
loadsegment(ds, child->thread.ds);
break;
case offsetof(struct user32, regs.es):
child->thread.es = val & 0xffff;
if (child == current)
loadsegment(es, child->thread.ds);
break;
case offsetof(struct user32, regs.ss):
if ((val & 3) != 3)
@ -129,15 +137,23 @@ static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
switch (regno) {
case offsetof(struct user32, regs.fs):
*val = child->thread.fsindex;
if (child == current)
asm("movl %%fs,%0" : "=r" (*val));
break;
case offsetof(struct user32, regs.gs):
*val = child->thread.gsindex;
if (child == current)
asm("movl %%gs,%0" : "=r" (*val));
break;
case offsetof(struct user32, regs.ds):
*val = child->thread.ds;
if (child == current)
asm("movl %%ds,%0" : "=r" (*val));
break;
case offsetof(struct user32, regs.es):
*val = child->thread.es;
if (child == current)
asm("movl %%es,%0" : "=r" (*val));
break;
R32(cs, cs);