diff options
| author | Harvey Harrison <harvey.harrison@gmail.com> | 2008-01-30 13:32:02 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:32:02 +0100 |
| commit | 40102d4a41312ad4134c0b802ad074445ce8b17b (patch) | |
| tree | 329da765c3a69759412c7991ae6b3a2a1384c8d9 | |
| parent | ddc66df876fd33d3956f3c3acc1ae334b16eedee (diff) | |
x86: add reenter_kprobe helper
[ mhiramat@redhat.com: updated it to latest x86.git ]
Factor common X86_32, X86_64 kprobe reenter logic from deeply
indented section to helper function.
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Jim Keniston <jkenisto@us.ibm.com>
| -rw-r--r-- | arch/x86/kernel/kprobes.c | 26 |
1 files changed, 15 insertions, 11 deletions
diff --git a/arch/x86/kernel/kprobes.c b/arch/x86/kernel/kprobes.c index f0f2b98b9e2..7dd918633c3 100644 --- a/arch/x86/kernel/kprobes.c +++ b/arch/x86/kernel/kprobes.c @@ -427,6 +427,20 @@ void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, /* Replace the return addr with trampoline addr */ *sara = (unsigned long) &kretprobe_trampoline; } +/* + * We have reentered the kprobe_handler(), since another probe was hit while + * within the handler. We save the original kprobes variables and just single + * step on the instruction of the new probe without calling any user handlers. + */ +static void __kprobes reenter_kprobe(struct kprobe *p, struct pt_regs *regs, + struct kprobe_ctlblk *kcb) +{ + save_previous_kprobe(kcb); + set_current_kprobe(p, regs, kcb); + kprobes_inc_nmissed_count(p); + prepare_singlestep(p, regs); + kcb->kprobe_status = KPROBE_REENTER; +} /* * Interrupts are disabled on entry as trap3 is an interrupt gate and they @@ -471,17 +485,7 @@ static int __kprobes kprobe_handler(struct pt_regs *regs) goto no_kprobe; #endif } - /* We have reentered the kprobe_handler(), since - * another probe was hit while within the handler. - * We here save the original kprobes variables and - * just single step on the instruction of the new probe - * without calling any user handlers. - */ - save_previous_kprobe(kcb); - set_current_kprobe(p, regs, kcb); - kprobes_inc_nmissed_count(p); - prepare_singlestep(p, regs); - kcb->kprobe_status = KPROBE_REENTER; + reenter_kprobe(p, regs, kcb); return 1; } else { if (*addr != BREAKPOINT_INSTRUCTION) { |