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[S390] fix loading of PER control registers for utrace. 

If the current task enables / disables PER tracing for itself the
PER control registers need to be loaded in FixPerRegisters.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2010-01-13 20:44:25 +01:00 committed by Martin Schwidefsky
parent 7284ce6c9f
commit c3311c13ad
1 changed files with 8 additions and 0 deletions
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8
arch/s390/kernel/ptrace.c
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@ -65,6 +65,7 @@ FixPerRegisters(struct task_struct *task)
{
struct pt_regs *regs;
per_struct *per_info;
per_cr_words cr_words;
regs = task_pt_regs(task);
per_info = (per_struct *) &task->thread.per_info;
@ -98,6 +99,13 @@ FixPerRegisters(struct task_struct *task)
per_info->control_regs.bits.storage_alt_space_ctl = 1;
else
per_info->control_regs.bits.storage_alt_space_ctl = 0;
if (task == current) {
__ctl_store(cr_words, 9, 11);
if (memcmp(&cr_words, &per_info->control_regs.words,
sizeof(cr_words)) != 0)
__ctl_load(per_info->control_regs.words, 9, 11);
}
}
void user_enable_single_step(struct task_struct *task)