From: Shuyi Cheng <chengshuyi@linux.alibaba.com>
To: bpf@vger.kernel.org
Cc: chengshuyi@linux.alibaba.com, andrii@kernel.org, ast@kernel.org,
daniel@iogearbox.net, song@kernel.org
Subject: [PATCH bpf-next] libbpf: Fixed getting wrong return address on arm64 architecture
Date: Sun, 8 Sep 2024 17:23:53 +0800 [thread overview]
Message-ID: <1725787433-77262-1-git-send-email-chengshuyi@linux.alibaba.com> (raw)
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
next reply other threads:[~2024-09-08 9:24 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-08 9:23 Shuyi Cheng [this message]
2024-09-09 23:00 ` [PATCH bpf-next] libbpf: Fixed getting wrong return address on arm64 architecture patchwork-bot+netdevbpf
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