static int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr)
{
struct kprobe *cur = kprobe_running();
pr_debug("kprobe_fault_handler: trapnr=%d\n", trapnr);
if (cur->fault_handler && cur->fault_handler(cur, regs, trapnr))
return 1;
if (kprobe_status & KPROBE_HIT_SS) {
resume_execution(cur, regs);
preempt_enable_no_resched();
}
return 0;
}
/* Interrupts disabled, kprobe_lock held. */
static inline int kprobe_fault_handler(struct pt_regs *regs, int trapnr)
{
if (current_kprobe->fault_handler
&& current_kprobe->fault_handler(current_kprobe, regs, trapnr))
return 1;
if (kprobe_status & KPROBE_HIT_SS) {
resume_execution(current_kprobe, regs);
regs->msr |= kprobe_saved_msr;
unlock_kprobes();
preempt_enable_no_resched();
}
return 0;
}
static int __kprobes post_kprobe_handler(struct pt_regs *regs)
{
struct kprobe *cur = kprobe_running();
pr_debug("post_kprobe_handler, cur=%p\n", cur);
if (!cur)
return 0;
if (cur->post_handler) {
kprobe_status = KPROBE_HIT_SSDONE;
cur->post_handler(cur, regs, 0);
}
resume_execution(cur, regs);
reset_current_kprobe();
preempt_enable_no_resched();
return 1;
}
static inline int post_kprobe_handler(struct pt_regs *regs)
{
if (!kprobe_running())
return 0;
if (current_kprobe->post_handler)
current_kprobe->post_handler(current_kprobe, regs, 0);
resume_execution(current_kprobe, regs);
regs->msr |= kprobe_saved_msr;
unlock_kprobes();
preempt_enable_no_resched();
/*
* if somebody else is singlestepping across a probe point, msr
* will have SE set, in which case, continue the remaining processing
* of do_debug, as if this is not a probe hit.
*/
if (regs->msr & MSR_SE)
return 0;
return 1;
}
