Commit 42a57120 authored by Jiri Olsa's avatar Jiri Olsa Committed by Alexei Starovoitov

bpf: Add bpf_get_func_ip kprobe helper for multi kprobe link

Adding support to call bpf_get_func_ip helper from kprobe
programs attached by multi kprobe link.
Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Acked-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220316122419.933957-5-jolsa@kernel.org
parent 0dcac272
......@@ -1037,6 +1037,18 @@ static const struct bpf_func_proto bpf_get_func_ip_proto_kprobe = {
.arg1_type = ARG_PTR_TO_CTX,
};
BPF_CALL_1(bpf_get_func_ip_kprobe_multi, struct pt_regs *, regs)
{
return instruction_pointer(regs);
}
static const struct bpf_func_proto bpf_get_func_ip_proto_kprobe_multi = {
.func = bpf_get_func_ip_kprobe_multi,
.gpl_only = false,
.ret_type = RET_INTEGER,
.arg1_type = ARG_PTR_TO_CTX,
};
BPF_CALL_1(bpf_get_attach_cookie_trace, void *, ctx)
{
struct bpf_trace_run_ctx *run_ctx;
......@@ -1280,7 +1292,9 @@ kprobe_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
return &bpf_override_return_proto;
#endif
case BPF_FUNC_get_func_ip:
return &bpf_get_func_ip_proto_kprobe;
return prog->expected_attach_type == BPF_TRACE_KPROBE_MULTI ?
&bpf_get_func_ip_proto_kprobe_multi :
&bpf_get_func_ip_proto_kprobe;
case BPF_FUNC_get_attach_cookie:
return &bpf_get_attach_cookie_proto_trace;
default:
......
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