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| author |   Jiri Olsa <jolsa@kernel.org> | 2022-03-16 13:24:10 +0100 |
|---|---|---|
| committer |   Alexei Starovoitov <ast@kernel.org> | 2022-03-17 20:17:19 -0700 |
| commit | 42a5712094e89ef0a125ac0f9d0873f9233368b1 (patch) | |
| tree | 914464cd50477c1ba5be6a503e75d3d2f13de8a8 /kernel/trace/bpf_trace.c | |
| parent | bpf: Add multi kprobe link (diff) | |
| download | linux-dev-42a5712094e89ef0a125ac0f9d0873f9233368b1.tar.xz linux-dev-42a5712094e89ef0a125ac0f9d0873f9233368b1.zip | |
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: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220316122419.933957-5-jolsa@kernel.org
Diffstat (limited to 'kernel/trace/bpf_trace.c')
| -rw-r--r-- | kernel/trace/bpf_trace.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index fffa2171fae4..250750932228 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -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: |