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libbpf: Fixed getting wrong return address on arm64 architecture

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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>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/1725787433-77262-1-git-send-email-chengshuyi@linux.alibaba.com
This commit is contained in:
Shuyi Cheng
2024-09-08 17:23:53 +08:00
committed by Andrii Nakryiko
parent 3b301cf75d
commit 81ac790dc8
1 changed files with 1 additions and 1 deletions
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2
src/bpf_tracing.h
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@@ -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