[PATCH bpf-next] libbpf: Fixed getting wrong return address on arm64 architecture

[PATCH bpf-next] libbpf: Fixed getting wrong return address on arm64 architecture

[Shuyi Cheng]

ARM64 has a separate lr register to store the return address, so here
you only need to read the lr register to get the return address, no need
to dereference it again.

Signed-off-by: Shuyi Cheng <chengshuyi@linux.alibaba.com>
---
 tools/lib/bpf/bpf_tracing.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/lib/bpf/bpf_tracing.h b/tools/lib/bpf/bpf_tracing.h
index 4eab132a963e..aa3b04f5542a 100644
--- a/tools/lib/bpf/bpf_tracing.h
+++ b/tools/lib/bpf/bpf_tracing.h
@@ -522,7 +522,7 @@ struct pt_regs;
 #define BPF_KPROBE_READ_RET_IP(ip, ctx)		({ (ip) = (ctx)->link; })
 #define BPF_KRETPROBE_READ_RET_IP		BPF_KPROBE_READ_RET_IP
 
-#elif defined(bpf_target_sparc)
+#elif defined(bpf_target_sparc) || defined(bpf_target_arm64)
 
 #define BPF_KPROBE_READ_RET_IP(ip, ctx)		({ (ip) = PT_REGS_RET(ctx); })
 #define BPF_KRETPROBE_READ_RET_IP		BPF_KPROBE_READ_RET_IP
-- 
2.32.0.3.g01195cf9f

Re: [PATCH bpf-next] libbpf: Fixed getting wrong return address on arm64 architecture

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Andrii Nakryiko <andrii@kernel.org>:

On Sun,  8 Sep 2024 17:23:53 +0800 you wrote:
> ARM64 has a separate lr register to store the return address, so here
> you only need to read the lr register to get the return address, no need
> to dereference it again.
> 
> Signed-off-by: Shuyi Cheng <chengshuyi@linux.alibaba.com>
> ---
>  tools/lib/bpf/bpf_tracing.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Here is the summary with links:
  - [bpf-next] libbpf: Fixed getting wrong return address on arm64 architecture
    https://git.kernel.org/bpf/bpf-next/c/12707b9159e6

You are awesome, thank you!
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