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authorShaohua Li <shaohua.li@intel.com>2007-11-13 14:55:20 +0800
committerTony Luck <tony.luck@intel.com>2007-12-07 16:12:50 -0800
commit3661999a17b0397c7a93c200b280c55958ba3593 (patch)
tree896f2b9a6580423cc7629dce446e7483eaba313c /arch/ia64
parent965d747264c91ed206846d74ae09f757a36a373b (diff)
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[IA64] kprobe: make kreturn probe handler stack unwind correct
Restore regs->ccr_iip before kreturn probe handler runs. In this way, if probe handler does unwind, unwind can correctly get the stack trace. Fixes: http://sourceware.org/bugzilla/show_bug.cgi?id=5051 Signed-off-by: Shaohua Li <shaohua.li@intel.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64')
-rw-r--r--arch/ia64/kernel/kprobes.c19
1 files changed, 17 insertions, 2 deletions
diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c
index 90518e43aba0..fc4d2676264f 100644
--- a/arch/ia64/kernel/kprobes.c
+++ b/arch/ia64/kernel/kprobes.c
@@ -435,6 +435,23 @@ int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
/* another task is sharing our hash bucket */
continue;
+ orig_ret_address = (unsigned long)ri->ret_addr;
+ 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;
+ }
+
+ regs->cr_iip = orig_ret_address;
+
+ hlist_for_each_entry_safe(ri, node, 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);
@@ -452,8 +469,6 @@ int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
kretprobe_assert(ri, orig_ret_address, trampoline_address);
- regs->cr_iip = orig_ret_address;
-
reset_current_kprobe();
spin_unlock_irqrestore(&kretprobe_lock, flags);
preempt_enable_no_resched();