Signed-off-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
---
Changes in v2:
Fix to use correct trampoline_address.
---
arch/powerpc/kernel/kprobes.c | 55 ++++-------------------------------------
1 file changed, 5 insertions(+), 50 deletions(-)
diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c
index 6ab9b4d037c3..f136037750be 100644
--- a/arch/powerpc/kernel/kprobes.c
+++ b/arch/powerpc/kernel/kprobes.c
@@ -218,6 +218,7 @@ bool arch_kprobe_on_func_entry(unsigned long offset)
void arch_prepare_kretprobe(struct kretprobe_instance *ri, struct pt_regs *regs)
{
ri->ret_addr = (kprobe_opcode_t *)regs->link;
+ ri->fp = NULL;
/* Replace the return addr with trampoline addr */
regs->link = (unsigned long)kretprobe_trampoline;
@@ -396,50 +397,11 @@ asm(".global kretprobe_trampoline\n"
*/
static int trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
{
- struct kretprobe_instance *ri = NULL;
- struct hlist_head *head, empty_rp;
- struct hlist_node *tmp;
- unsigned long flags, orig_ret_address = 0;
- unsigned long trampoline_address =(unsigned long)&kretprobe_trampoline;
-
- INIT_HLIST_HEAD(&empty_rp);
- kretprobe_hash_lock(current, &head, &flags);
-
- /*
- * It is possible to have multiple instances associated with a given
- * task either because an multiple functions in the call path
- * have a return probe installed on them, and/or more than one return
- * return probe was registered for a target function.
- *
- * We can handle this because:
- * - instances are always inserted at the head of the list
- * - when multiple return probes are registered for the same
- * function, the first instance's ret_addr will point to the
- * real return address, and all the rest will point to
- * kretprobe_trampoline
- */
- hlist_for_each_entry_safe(ri, tmp, head, hlist) {
- if (ri->task != current)
- /* another task is sharing our hash bucket */
- continue;
-
- if (ri->rp && ri->rp->handler)
- ri->rp->handler(ri, regs);
-
- orig_ret_address = (unsigned long)ri->ret_addr;
- recycle_rp_inst(ri, &empty_rp);
-
- if (orig_ret_address != trampoline_address)
- /*
- * This is the real return address. Any other
- * instances associated with this task are for
- * other calls deeper on the call stack
- */
- break;
- }
-
- kretprobe_assert(ri, orig_ret_address, trampoline_address);
+ unsigned long orig_ret_address;
+ orig_ret_address = __kretprobe_trampoline_handler(regs,
+ (unsigned long)&kretprobe_trampoline,
+ NULL);
/*
* We get here through one of two paths:
* 1. by taking a trap -> kprobe_handler() -> here
@@ -458,13 +420,6 @@ static int trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
regs->nip = orig_ret_address - 4;
regs->link = orig_ret_address;
- kretprobe_hash_unlock(current, &flags);
-
- hlist_for_each_entry_safe(ri, tmp, &empty_rp, hlist) {
- hlist_del(&ri->hlist);
- kfree(ri);
- }
-
return 0;
}
NOKPROBE_SYMBOL(trampoline_probe_handler);
