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x86: x86-32 ptrace get/putreg current task 

This generalizes the getreg and putreg 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 ce90f34085
commit 5fd4d16bd5
1 changed files with 8 additions and 0 deletions
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8
arch/x86/kernel/ptrace_32.c
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@ -55,6 +55,12 @@ static int putreg(struct task_struct *child,
if (value && (value & 3) != 3) if (value && (value & 3) != 3)
return -EIO; return -EIO;
child->thread.gs = value; child->thread.gs = value;
if (child == current)
/*
* The user-mode %gs is not affected by
* kernel entry, so we must update the CPU.
*/
loadsegment(gs, value);
return 0; return 0;
case DS: case DS:
case ES: case ES:
@ -104,6 +110,8 @@ static unsigned long getreg(struct task_struct *child, unsigned long regno)
break; break;
case GS: case GS:
retval = child->thread.gs; retval = child->thread.gs;
if (child == current)
savesegment(gs, retval);
break; break;
case DS: case DS:
case ES: case ES: