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Groups > linux.kernel > #1224305
| From | Arnaldo Carvalho de Melo <acme@kernel.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 03/27] perf tests: Stop reading if objdump output crossed sections |
| Date | 2015-09-14 18:40 +0200 |
| Message-ID | <q8EXo-3f1-29@gated-at.bofh.it> (permalink) |
| References | <q8EXn-3f1-7@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
From: Jan Stancek <jstancek@redhat.com>
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>
---
tools/perf/tests/code-reading.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
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 */
--
2.1.0
--
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[GIT PULL 00/27] perf/core2 improvements and fixes Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-14 18:40 +0200
[PATCH 01/27] perf tests: Take into account address of each objdump line Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-14 18:40 +0200
[PATCH 03/27] perf tests: Stop reading if objdump output crossed sections Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-14 18:40 +0200
[PATCH 12/27] perf env: Rename some leftovers from rename to perf_env Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-14 18:50 +0200
[PATCH 16/27] perf tools: Add tools/include into tags directories Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-14 18:50 +0200
[PATCH 14/27] perf hists browser: Fixup the "cpu" column width calculation Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-14 18:50 +0200
[PATCH 21/27] perf env: Introduce read_cpu_topology_map() method Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-14 18:50 +0200
[PATCH 19/27] tools lib api cpu: Introduce cpu.[ch] to obtain cpu related information Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-14 18:50 +0200
[PATCH 22/27] perf machine: Add pointer to sample's environment Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-14 18:50 +0200
[PATCH 11/27] perf env: Move perf_env out of header.h and session.c into separate object Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-14 18:50 +0200
[PATCH 27/27] perf test: Add entry for hists socket filter Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-14 18:50 +0200
[PATCH 15/27] perf evsel: Remove forward declaration of 'struct perf_evlist' Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-14 18:50 +0200
[PATCH 10/27] perf tests: Introduce iterator function for tests Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-14 18:50 +0200
[PATCH 20/27] perf cpu_map: Use sysfs__read_int in get_{core,socket}_id() Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-14 18:50 +0200
[PATCH 13/27] perf env: Adopt perf_header__set_cmdline Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-14 18:50 +0200
[PATCH 24/27] perf tools: Introduce new sort type "socket" for the processor socket Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-14 18:50 +0200
[PATCH 08/27] perf tools: Switch to tracing_path interface on appropriate places Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-14 18:50 +0200
[PATCH 23/27] perf tools: Add processor socket info to hist_entry and addr_location Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-14 18:50 +0200
[PATCH 25/27] perf report: Introduce --socket-filter option Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-14 18:50 +0200
[PATCH 26/27] perf hists browser: Zoom in/out for processor socket Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-14 18:50 +0200
[PATCH 18/27] tools lib api fs: Introduce sysfs__read_{int,ull}() Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-14 18:50 +0200
[PATCH 17/27] perf env: Read msr pmu type from header Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-14 18:50 +0200
[PATCH 09/27] perf test: Add entry to test cpu topology Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-14 18:50 +0200
[PATCH 07/27] tools lib api fs: Remove debugfs, tracefs and findfs objects Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-14 19:00 +0200
[PATCH 06/27] tools lib api fs: Replace debugfs/tracefs objects interface with fs.c Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-14 19:00 +0200
[PATCH 05/27] tools lib api fs: Make tracing_path_strerror_open message generic Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-14 19:00 +0200
Re: [GIT PULL 00/27] perf/core2 improvements and fixes Ingo Molnar <mingo@kernel.org> - 2015-09-15 09:00 +0200
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