Commit 12707b91 authored by Shuyi Cheng's avatar Shuyi Cheng Committed by Andrii Nakryiko
Browse files

libbpf: Fixed getting wrong return address on arm64 architecture 



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: default avatarShuyi Cheng <chengshuyi@linux.alibaba.com>
Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/1725787433-77262-1-git-send-email-chengshuyi@linux.alibaba.com
parent 8a3f14bb

tools/lib/bpf/bpf_tracing.h

+1 −1
Original line number Diff line number Diff line
@@ -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