diff options
Diffstat (limited to 'kernel/tools/perf/tests/code-reading.c')
| -rw-r--r-- | kernel/tools/perf/tests/code-reading.c | 114 |
1 files changed, 83 insertions, 31 deletions
diff --git a/kernel/tools/perf/tests/code-reading.c b/kernel/tools/perf/tests/code-reading.c index f671ec37a..a767a6400 100644 --- a/kernel/tools/perf/tests/code-reading.c +++ b/kernel/tools/perf/tests/code-reading.c @@ -33,20 +33,20 @@ static unsigned int hex(char c) return c - 'A' + 10; } -static void read_objdump_line(const char *line, size_t line_len, void **buf, - size_t *len) +static size_t read_objdump_line(const char *line, size_t line_len, void *buf, + size_t len) { const char *p; - size_t i; + size_t i, j = 0; /* Skip to a colon */ p = strchr(line, ':'); if (!p) - return; + return 0; i = p + 1 - line; /* Read bytes */ - while (*len) { + while (j < len) { char c1, c2; /* Skip spaces */ @@ -65,20 +65,26 @@ static void read_objdump_line(const char *line, size_t line_len, void **buf, if (i < line_len && line[i] && !isspace(line[i])) break; /* Store byte */ - *(unsigned char *)*buf = (hex(c1) << 4) | hex(c2); - *buf += 1; - *len -= 1; + *(unsigned char *)buf = (hex(c1) << 4) | hex(c2); + buf += 1; + j++; } + /* return number of successfully read bytes */ + return j; } -static int read_objdump_output(FILE *f, void **buf, size_t *len) +static int read_objdump_output(FILE *f, void *buf, size_t *len, u64 start_addr) { char *line = NULL; - size_t line_len; + size_t line_len, off_last = 0; ssize_t ret; int err = 0; + u64 addr, last_addr = start_addr; + + while (off_last < *len) { + size_t off, read_bytes, written_bytes; + unsigned char tmp[BUFSZ]; - while (1) { ret = getline(&line, &line_len, f); if (feof(f)) break; @@ -87,9 +93,33 @@ static int read_objdump_output(FILE *f, void **buf, size_t *len) err = -1; break; } - read_objdump_line(line, ret, buf, len); + + /* read objdump data into temporary buffer */ + read_bytes = read_objdump_line(line, ret, tmp, sizeof(tmp)); + if (!read_bytes) + continue; + + if (sscanf(line, "%"PRIx64, &addr) != 1) + continue; + if (addr < last_addr) { + pr_debug("addr going backwards, read beyond section?\n"); + break; + } + last_addr = addr; + + /* copy it from temporary buffer to 'buf' according + * to address on current objdump line */ + off = addr - start_addr; + if (off >= *len) + break; + written_bytes = MIN(read_bytes, *len - off); + memcpy(buf + off, tmp, written_bytes); + off_last = off + written_bytes; } + /* len returns number of bytes that could not be read */ + *len -= off_last; + free(line); return err; @@ -103,7 +133,7 @@ static int read_via_objdump(const char *filename, u64 addr, void *buf, FILE *f; int ret; - fmt = "%s -d --start-address=0x%"PRIx64" --stop-address=0x%"PRIx64" %s"; + fmt = "%s -z -d --start-address=0x%"PRIx64" --stop-address=0x%"PRIx64" %s"; ret = snprintf(cmd, sizeof(cmd), fmt, "objdump", addr, addr + len, filename); if (ret <= 0 || (size_t)ret >= sizeof(cmd)) @@ -120,7 +150,7 @@ static int read_via_objdump(const char *filename, u64 addr, void *buf, return -1; } - ret = read_objdump_output(f, &buf, &len); + ret = read_objdump_output(f, buf, &len, addr); if (len) { pr_debug("objdump read too few bytes\n"); if (!ret) @@ -132,6 +162,18 @@ static int read_via_objdump(const char *filename, u64 addr, void *buf, return ret; } +static void dump_buf(unsigned char *buf, size_t len) +{ + size_t i; + + for (i = 0; i < len; i++) { + pr_debug("0x%02x ", buf[i]); + if (i % 16 == 15) + pr_debug("\n"); + } + pr_debug("\n"); +} + static int read_object_code(u64 addr, size_t len, u8 cpumode, struct thread *thread, struct state *state) { @@ -234,6 +276,10 @@ static int read_object_code(u64 addr, size_t len, u8 cpumode, /* The results should be identical */ if (memcmp(buf1, buf2, len)) { pr_debug("Bytes read differ from those read by objdump\n"); + pr_debug("buf1 (dso):\n"); + dump_buf(buf1, len); + pr_debug("buf2 (objdump):\n"); + dump_buf(buf2, len); return -1; } pr_debug("Bytes read match those read by objdump\n"); @@ -248,6 +294,7 @@ static int process_sample_event(struct machine *machine, struct perf_sample sample; struct thread *thread; u8 cpumode; + int ret; if (perf_evlist__parse_sample(evlist, event, &sample)) { pr_debug("perf_evlist__parse_sample failed\n"); @@ -262,7 +309,9 @@ static int process_sample_event(struct machine *machine, cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; - return read_object_code(sample.ip, READLEN, cpumode, thread, state); + ret = read_object_code(sample.ip, READLEN, cpumode, thread, state); + thread__put(thread); + return ret; } static int process_event(struct machine *machine, struct perf_evlist *evlist, @@ -424,7 +473,7 @@ static int do_test_code_reading(bool try_kcore) symbol_conf.kallsyms_name = "/proc/kallsyms"; /* Load kernel map */ - map = machine->vmlinux_maps[MAP__FUNCTION]; + map = machine__kernel_map(machine); ret = map__load(map, NULL); if (ret < 0) { pr_debug("map__load failed\n"); @@ -448,7 +497,7 @@ static int do_test_code_reading(bool try_kcore) } ret = perf_event__synthesize_thread_map(NULL, threads, - perf_event__process, machine, false); + perf_event__process, machine, false, 500); if (ret < 0) { pr_debug("perf_event__synthesize_thread_map failed\n"); goto out_err; @@ -457,13 +506,13 @@ static int do_test_code_reading(bool try_kcore) thread = machine__findnew_thread(machine, pid, pid); if (!thread) { pr_debug("machine__findnew_thread failed\n"); - goto out_err; + goto out_put; } cpus = cpu_map__new(NULL); if (!cpus) { pr_debug("cpu_map__new failed\n"); - goto out_err; + goto out_put; } while (1) { @@ -472,7 +521,7 @@ static int do_test_code_reading(bool try_kcore) evlist = perf_evlist__new(); if (!evlist) { pr_debug("perf_evlist__new failed\n"); - goto out_err; + goto out_put; } perf_evlist__set_maps(evlist, cpus, threads); @@ -482,10 +531,10 @@ static int do_test_code_reading(bool try_kcore) else str = "cycles"; pr_debug("Parsing event '%s'\n", str); - ret = parse_events(evlist, str); + ret = parse_events(evlist, str, NULL); if (ret < 0) { pr_debug("parse_events failed\n"); - goto out_err; + goto out_put; } perf_evlist__config(evlist, &opts); @@ -506,7 +555,7 @@ static int do_test_code_reading(bool try_kcore) continue; } pr_debug("perf_evlist__open failed\n"); - goto out_err; + goto out_put; } break; } @@ -514,7 +563,7 @@ static int do_test_code_reading(bool try_kcore) ret = perf_evlist__mmap(evlist, UINT_MAX, false); if (ret < 0) { pr_debug("perf_evlist__mmap failed\n"); - goto out_err; + goto out_put; } perf_evlist__enable(evlist); @@ -525,7 +574,7 @@ static int do_test_code_reading(bool try_kcore) ret = process_events(machine, evlist, &state); if (ret < 0) - goto out_err; + goto out_put; if (!have_vmlinux && !have_kcore && !try_kcore) err = TEST_CODE_READING_NO_KERNEL_OBJ; @@ -535,12 +584,15 @@ static int do_test_code_reading(bool try_kcore) err = TEST_CODE_READING_NO_ACCESS; else err = TEST_CODE_READING_OK; +out_put: + thread__put(thread); out_err: + if (evlist) { perf_evlist__delete(evlist); } else { - cpu_map__delete(cpus); - thread_map__delete(threads); + cpu_map__put(cpus); + thread_map__put(threads); } machines__destroy_kernel_maps(&machines); machine__delete_threads(machine); @@ -561,16 +613,16 @@ int test__code_reading(void) case TEST_CODE_READING_OK: return 0; case TEST_CODE_READING_NO_VMLINUX: - fprintf(stderr, " (no vmlinux)"); + pr_debug("no vmlinux\n"); return 0; case TEST_CODE_READING_NO_KCORE: - fprintf(stderr, " (no kcore)"); + pr_debug("no kcore\n"); return 0; case TEST_CODE_READING_NO_ACCESS: - fprintf(stderr, " (no access)"); + pr_debug("no access\n"); return 0; case TEST_CODE_READING_NO_KERNEL_OBJ: - fprintf(stderr, " (no kernel obj)"); + pr_debug("no kernel obj\n"); return 0; default: return -1; |