Commit 5fd4d16b authored by Roland McGrath's avatar Roland McGrath Committed by Ingo Molnar

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: default avatarRoland McGrath <roland@redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent ce90f340
......@@ -55,6 +55,12 @@ static int putreg(struct task_struct *child,
if (value && (value & 3) != 3)
return -EIO;
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;
case DS:
case ES:
......@@ -104,6 +110,8 @@ static unsigned long getreg(struct task_struct *child, unsigned long regno)
break;
case GS:
retval = child->thread.gs;
if (child == current)
savesegment(gs, retval);
break;
case DS:
case ES:
......
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