From 73bc4d9fc045fb709483a733683f816e64a99431 Mon Sep 17 00:00:00 2001 From: Yonghong Song Date: Thu, 24 May 2018 11:21:11 -0700 Subject: [PATCH] tools/bpf: add ksym_get_addr() in trace_helpers Given a kernel function name, ksym_get_addr() will return the kernel address for this function, or 0 if it cannot find this function name in /proc/kallsyms. This function will be used later when a kernel address is used to initiate a kprobe perf event. Acked-by: Martin KaFai Lau Signed-off-by: Yonghong Song Signed-off-by: Alexei Starovoitov --- tools/testing/selftests/bpf/trace_helpers.c | 12 ++++++++++++ tools/testing/selftests/bpf/trace_helpers.h | 1 + 2 files changed, 13 insertions(+) diff --git a/tools/testing/selftests/bpf/trace_helpers.c b/tools/testing/selftests/bpf/trace_helpers.c index 8fb4fe8..3868dcb6 100644 --- a/tools/testing/selftests/bpf/trace_helpers.c +++ b/tools/testing/selftests/bpf/trace_helpers.c @@ -72,6 +72,18 @@ struct ksym *ksym_search(long key) return &syms[0]; } +long ksym_get_addr(const char *name) +{ + int i; + + for (i = 0; i < sym_cnt; i++) { + if (strcmp(syms[i].name, name) == 0) + return syms[i].addr; + } + + return 0; +} + static int page_size; static int page_cnt = 8; static struct perf_event_mmap_page *header; diff --git a/tools/testing/selftests/bpf/trace_helpers.h b/tools/testing/selftests/bpf/trace_helpers.h index 36d90e3..3b4bcf7 100644 --- a/tools/testing/selftests/bpf/trace_helpers.h +++ b/tools/testing/selftests/bpf/trace_helpers.h @@ -11,6 +11,7 @@ struct ksym { int load_kallsyms(void); struct ksym *ksym_search(long key); +long ksym_get_addr(const char *name); typedef enum bpf_perf_event_ret (*perf_event_print_fn)(void *data, int size); -- 2.7.4