diff options
Diffstat (limited to 'arch/powerpc/kernel/kprobes-ftrace.c')
| -rw-r--r-- | arch/powerpc/kernel/kprobes-ftrace.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/arch/powerpc/kernel/kprobes-ftrace.c b/arch/powerpc/kernel/kprobes-ftrace.c index 972cb28174b2..072ebe7f290b 100644 --- a/arch/powerpc/kernel/kprobes-ftrace.c +++ b/arch/powerpc/kernel/kprobes-ftrace.c @@ -14,14 +14,21 @@ /* Ftrace callback handler for kprobes */ void kprobe_ftrace_handler(unsigned long nip, unsigned long parent_nip, - struct ftrace_ops *ops, struct pt_regs *regs) + struct ftrace_ops *ops, struct ftrace_regs *fregs) { struct kprobe *p; struct kprobe_ctlblk *kcb; + struct pt_regs *regs; + int bit; + bit = ftrace_test_recursion_trylock(nip, parent_nip); + if (bit < 0) + return; + + regs = ftrace_get_regs(fregs); p = get_kprobe((kprobe_opcode_t *)nip); if (unlikely(!p) || kprobe_disabled(p)) - return; + goto out; kcb = get_kprobe_ctlblk(); if (kprobe_running()) { @@ -31,7 +38,7 @@ void kprobe_ftrace_handler(unsigned long nip, unsigned long parent_nip, * On powerpc, NIP is *before* this instruction for the * pre handler */ - regs->nip -= MCOUNT_INSN_SIZE; + regs_add_return_ip(regs, -MCOUNT_INSN_SIZE); __this_cpu_write(current_kprobe, p); kcb->kprobe_status = KPROBE_HIT_ACTIVE; @@ -40,7 +47,7 @@ void kprobe_ftrace_handler(unsigned long nip, unsigned long parent_nip, * Emulate singlestep (and also recover regs->nip) * as if there is a nop */ - regs->nip += MCOUNT_INSN_SIZE; + regs_add_return_ip(regs, MCOUNT_INSN_SIZE); if (unlikely(p->post_handler)) { kcb->kprobe_status = KPROBE_HIT_SSDONE; p->post_handler(p, regs, 0); @@ -52,6 +59,8 @@ void kprobe_ftrace_handler(unsigned long nip, unsigned long parent_nip, */ __this_cpu_write(current_kprobe, NULL); } +out: + ftrace_test_recursion_unlock(bit); } NOKPROBE_SYMBOL(kprobe_ftrace_handler); |