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. Also available at: https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git bpf/get_func_ip v4 changes: - dropped jit/x86 check for get_func_ip tracing check [Alexei] - added code to bpf_get_func_ip_tracing [Alexei] and tested that it works without inlining [Alexei] - changed has_get_func_ip to check_get_func_ip [Andrii] - replaced test assert loop with explicit asserts [Andrii] - adde bpf_program__attach_kprobe_opts function and use it for offset setup [Andrii] - used bpf_program__set_autoload(false) for test6 [Andrii] - added Masami's ack v3 changes: - resend with Masami in cc and v3 in each patch subject v2 changes: - use kprobe_running to get kprobe instead of cpu var [Masami] - added support to add kprobe on function+offset and test for that [Alan] thanks, jirka --- Alan Maguire (1): libbpf: Allow specification of "kprobe/function+offset" Jiri Olsa (7): 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 libbpf: Add bpf_program__attach_kprobe_opts function selftests/bpf: Add test for bpf_get_func_ip in kprobe+offset probe 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 | 45 +++++++++++++++++++++++++++++++++++++++++++++ kernel/trace/bpf_trace.c | 31 +++++++++++++++++++++++++++++++ tools/include/uapi/linux/bpf.h | 7 +++++++ tools/lib/bpf/libbpf.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++---------- tools/testing/selftests/bpf/prog_tests/get_func_ip_test.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++ tools/testing/selftests/bpf/progs/get_func_ip_test.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 11 files changed, 297 insertions(+), 14 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
