summaryrefslogtreecommitdiffstats
path: root/arch/s390/kernel/kprobes.c
diff options
context:
space:
mode:
authorMartin Schwidefsky <schwidefsky@de.ibm.com>2010-10-29 16:50:45 +0200
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2010-10-29 16:50:50 +0200
commit9ec2708053b647969bee862902872d44a5f9b439 (patch)
treea7ca43a31a656bac010fac46d11ff0fa23488ef1 /arch/s390/kernel/kprobes.c
parentf2166bb117952404689f0dc42624ee0b54a66e5e (diff)
downloadlinux-9ec2708053b647969bee862902872d44a5f9b439.tar.bz2
[S390] fix kprobes single stepping
Fix kprobes after git commit 1e54622e0403891b10f2105663e0f9dd595a1f17 broke it. The kprobe_handler is now called with interrupts in the state at the time of the breakpoint. The single step of the replaced instruction is done with interrupts off which makes it necessary to enable and disable the interupts in the kprobes code. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/kprobes.c')
-rw-r--r--arch/s390/kernel/kprobes.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/s390/kernel/kprobes.c b/arch/s390/kernel/kprobes.c
index 2a3d2bf6f083..d60fc4398516 100644
--- a/arch/s390/kernel/kprobes.c
+++ b/arch/s390/kernel/kprobes.c
@@ -316,6 +316,8 @@ static int __kprobes kprobe_handler(struct pt_regs *regs)
return 1;
ss_probe:
+ if (regs->psw.mask & (PSW_MASK_PER | PSW_MASK_IO))
+ local_irq_disable();
prepare_singlestep(p, regs);
kcb->kprobe_status = KPROBE_HIT_SS;
return 1;
@@ -463,6 +465,8 @@ static int __kprobes post_kprobe_handler(struct pt_regs *regs)
goto out;
}
reset_current_kprobe();
+ if (regs->psw.mask & (PSW_MASK_PER | PSW_MASK_IO))
+ local_irq_enable();
out:
preempt_enable_no_resched();
@@ -502,8 +506,11 @@ int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr)
regs->psw.mask |= kcb->kprobe_saved_imask;
if (kcb->kprobe_status == KPROBE_REENTER)
restore_previous_kprobe(kcb);
- else
+ else {
reset_current_kprobe();
+ if (regs->psw.mask & (PSW_MASK_PER | PSW_MASK_IO))
+ local_irq_enable();
+ }
preempt_enable_no_resched();
break;
case KPROBE_HIT_ACTIVE: