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Date:   Fri, 15 Oct 2021 21:51:19 +0900
From:   Masami Hiramatsu <>
To:     Steven Rostedt <>
Cc:     "Naveen N . Rao" <>,
        Ananth N Mavinakayanahalli <>,
        Ingo Molnar <>,,, Sven Schnelle <>,
        Catalin Marinas <>,
        Will Deacon <>,
        Russell King <>,
        Nathan Chancellor <>,
        Nick Desaulniers <>,
Subject: [PATCH 04/10] arm64: kprobes: Record frame pointer with kretprobe instance

Record the frame pointer instead of stack address with kretprobe
instance as the identifier on the instance list.
Since arm64 always enable CONFIG_FRAME_POINTER, we can use the
actual frame pointer (x29).

This will allow the stacktrace code to find the original return
address from the FP alone.

Signed-off-by: Masami Hiramatsu <>
Acked-by: Will Deacon <>
Acked-by: Mark Rutland <>
 Changes in v2:
  - Update changelog according to Mark's comment.
 arch/arm64/kernel/probes/kprobes.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/kernel/probes/kprobes.c b/arch/arm64/kernel/probes/kprobes.c
index e7ad6da980e8..d9dfa82c1f18 100644
--- a/arch/arm64/kernel/probes/kprobes.c
+++ b/arch/arm64/kernel/probes/kprobes.c
@@ -401,14 +401,14 @@ int __init arch_populate_kprobe_blacklist(void)
 void __kprobes __used *trampoline_probe_handler(struct pt_regs *regs)
-	return (void *)kretprobe_trampoline_handler(regs, (void *)kernel_stack_pointer(regs));
+	return (void *)kretprobe_trampoline_handler(regs, (void *)regs->regs[29]);
 void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
 				      struct pt_regs *regs)
 	ri->ret_addr = (kprobe_opcode_t *)regs->regs[30];
-	ri->fp = (void *)kernel_stack_pointer(regs);
+	ri->fp = (void *)regs->regs[29];
 	/* replace return addr (x30) with trampoline */
 	regs->regs[30] = (long)&__kretprobe_trampoline;

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