diff options
Diffstat (limited to 'tools/testing/selftests/bpf/trace_helpers.c')
-rw-r--r-- | tools/testing/selftests/bpf/trace_helpers.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/trace_helpers.c b/tools/testing/selftests/bpf/trace_helpers.c index 4d0e913bbb22..1bbd1d9830c8 100644 --- a/tools/testing/selftests/bpf/trace_helpers.c +++ b/tools/testing/selftests/bpf/trace_helpers.c @@ -90,6 +90,33 @@ long ksym_get_addr(const char *name) return 0; } +/* open kallsyms and read symbol addresses on the fly. Without caching all symbols, + * this is faster than load + find. + */ +int kallsyms_find(const char *sym, unsigned long long *addr) +{ + char type, name[500]; + unsigned long long value; + int err = 0; + FILE *f; + + f = fopen("/proc/kallsyms", "r"); + if (!f) + return -EINVAL; + + while (fscanf(f, "%llx %c %499s%*[^\n]\n", &value, &type, name) > 0) { + if (strcmp(name, sym) == 0) { + *addr = value; + goto out; + } + } + err = -ENOENT; + +out: + fclose(f); + return err; +} + void read_trace_pipe(void) { int trace_fd; |