diff options
| author | Jan Stancek <jstancek@redhat.com> | 2015-09-02 11:19:16 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-09-14 18:50:12 +0300 |
| commit | edfdb7eab0fe5f98f2951598dc679b71bdb3e16b (patch) | |
| tree | 507d05df90b975d8f5de8e0f692d1deb610bc7a5 /tools/perf/tests/code-reading.c | |
| parent | 06f679c18fcf414cc8462938466f8361315f18cb (diff) | |
| download | linux-edfdb7eab0fe5f98f2951598dc679b71bdb3e16b.tar.xz | |
perf tests: Stop reading if objdump output crossed sections
objdump output can span across multiple sections:
Disassembly of section .text:
0000000000000008 <crc32c+0x8>:
8: 48 89 e5 mov %rsp,%rbp
b: 53 push %rbx
c: 8b 01 mov (%rcx),%eax
<snip>
6b: 90 nop
Disassembly of section .init.text:
0000000000000008 <init_module+0x8>:
8: 00 00 add %al,(%rax)
a: 00 00 add %al,(%rax)
c: 48 89 e5
Stop further reading if an address starts going backwards, assuming we
crossed sections.
Signed-off-by: Jan Stancek <jstancek@redhat.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/9d1ea95e5f9884fdff1be6f761a2feabef37412c.1441181335.git.jstancek@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/tests/code-reading.c')
| -rw-r--r-- | tools/perf/tests/code-reading.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-reading.c index c409409d7765..8145c67fb43a 100644 --- a/tools/perf/tests/code-reading.c +++ b/tools/perf/tests/code-reading.c @@ -79,7 +79,7 @@ static int read_objdump_output(FILE *f, void *buf, size_t *len, u64 start_addr) size_t line_len, off_last = 0; ssize_t ret; int err = 0; - u64 addr; + u64 addr, last_addr = start_addr; while (off_last < *len) { size_t off, read_bytes, written_bytes; @@ -101,6 +101,11 @@ static int read_objdump_output(FILE *f, void *buf, size_t *len, u64 start_addr) 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 */ |