hi, adding bpf_get_func_ip helper that returns IP address of the caller function for trampoline and krobe programs. There're 2 specific implementation of the bpf_get_func_ip helper, one for trampoline progs and one for kprobe/kretprobe progs. The trampoline helper call is replaced/inlined by verifier with simple move instruction. The kprobe/kretprobe is actual helper call that returns prepared caller address. The trampoline extra 3 instructions for storing IP address is now optional, which I'm not completely sure is necessary, so I plan to do some benchmarks, if it's noticeable, hence the RFC. I'm also not completely sure about the kprobe/kretprobe implementation. Also available at: https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git bpf/get_func_ip thanks, jirka --- Jiri Olsa (5): bpf, x86: Store caller's ip in trampoline stack bpf: Enable BPF_TRAMP_F_IP_ARG for trampolines with call_get_func_ip bpf: Add bpf_get_func_ip helper for tracing programs bpf: Add bpf_get_func_ip helper for kprobe programs selftests/bpf: Add test for bpf_get_func_ip helper arch/x86/net/bpf_jit_comp.c | 19 +++++++++++++++++++ include/linux/bpf.h | 5 +++++ include/linux/filter.h | 3 ++- include/uapi/linux/bpf.h | 7 +++++++ kernel/bpf/trampoline.c | 12 +++++++++--- kernel/bpf/verifier.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ kernel/trace/bpf_trace.c | 29 +++++++++++++++++++++++++++++ kernel/trace/trace_kprobe.c | 20 ++++++++++++++++++-- kernel/trace/trace_probe.h | 5 +++++ tools/include/uapi/linux/bpf.h | 7 +++++++ tools/testing/selftests/bpf/prog_tests/get_func_ip_test.c | 42 ++++++++++++++++++++++++++++++++++++++++++ tools/testing/selftests/bpf/progs/get_func_ip_test.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 12 files changed, 260 insertions(+), 6 deletions(-) create mode 100644 tools/testing/selftests/bpf/prog_tests/get_func_ip_test.c create mode 100644 tools/testing/selftests/bpf/progs/get_func_ip_test.c
