From: markus.t.metzger@intel.com
To: gdb-patches@sourceware.org
Cc: markus.t.metzger@gmail.com, Markus Metzger <markus.t.metzger@intel.com>
Subject: [PATCH 00/16] branch tracing support
Date: Thu, 10 May 2012 15:15:00 -0000 [thread overview]
Message-ID: <1336662810-21937-1-git-send-email-markus.t.metzger@intel.com> (raw)
From: Markus Metzger <markus.t.metzger@intel.com>
IA hardware offers a feature called Branch Trace Store (BTS) that stores a log
of branches into an OS provided ring buffer.
Linux supports this feature since 2.6.32 as part of the perf_event interface.
Branch tracing is very useful to debug problems that do not immediatly result in
a crash. It is particularly useful for bugs that make other debugger features
fail, e.g. a corrupted stack that breaks unwinding.
In comparison with reverse debugging, branch tracing is less powerful but
faster. In addition, the list view (see below) provides a quick overview of
where you are, comparable with the backtrace command.
This series adds commands to enable/disable branch tracing as well as to display
the recorded trace:
- "btrace enable/disable" perform the obvious operation
They accept an optional range argument specifying the range of threads to
enable/disable branch tracing for. If no argument is given, they target the
current thread.
They further accept the following arguments:
all targets all threads
auto turns automatic enabling for new threads on/off
- "btrace list" prints the blocks that have been traced; one line per block.
The output may be configured using modifiers (default: /fl). It prints:
the block number
/a the begin and end code address of that block
/f the function containing the block
/l the source lines contained in the block
It accepts an optional range argument specifying the range of blocks to be
listed. If no argument is given, all blocks are listed.
Blocks are ordered from newest to oldest; block 1 always contains the
current location.
(gdb) btrace list 24-34
24 in stdio_file_flush () at ../../../git/gdb/ui-file.c:525-529
25 in ui_file_data () at ../../../git/gdb/ui-file.c:175-180
26 in stdio_file_flush () at ../../../git/gdb/ui-file.c:522-523
27 in gdb_flush () at ../../../git/gdb/ui-file.c:185
28 in gdb_wait_for_event () at ../../../git/gdb/event-loop.c:840-847
29 in gdb_do_one_event () at ../../../git/gdb/event-loop.c:461
30 in gdb_do_one_event () at ../../../git/gdb/event-loop.c:453
31 in process_event () at ../../../git/gdb/event-loop.c:407
32 in process_event () at ../../../git/gdb/event-loop.c:361-367
33 in process_event () at ../../../git/gdb/event-loop.c:1041-1043
34 in process_event () at ../../../git/gdb/event-loop.c:1041-1045
- "btrace" prints the branch trace disassembly
Branch trace is printed block-by-block. Typically, one block at a time is
printed. Repeated commands will iterate over all blocks similar to the list
command.
It supports the /m and /r modifiers accepted by the disassemble command.
It accepts an optional range argument specifying the range of blocks to be
printed. If more than one block is given, blocks are printed in reverse
order to preserve the original control flow.
(gdb) btrace /m 25
../../../git/gdb/ui-file.c:175 {
0x0000000000635410 <ui_file_data+0>: sub $0x8,%rsp
../../../git/gdb/ui-file.c:176 if (file->magic != &ui_file_magic)
0x0000000000635414 <ui_file_data+4>: cmpq $0xb33b94,(%rdi)
0x000000000063541b <ui_file_data+11>: jne 0x635426 <ui_file_data+22>
../../../git/gdb/ui-file.c:177 internal_error (__FILE__, __LINE__,
0x000000000063541d <ui_file_data+13>: mov 0x50(%rdi),%rax
../../../git/gdb/ui-file.c:178 _("ui_file_data: bad magic number"));
../../../git/gdb/ui-file.c:179 return file->to_data;
../../../git/gdb/ui-file.c:180 }
0x0000000000635421 <ui_file_data+17>: add $0x8,%rsp
0x0000000000635425 <ui_file_data+21>: retq
Mixed source and disassembly does not work very well for inlined functions,
a problem that it shares with the disassemble command.
Barkha Ahuja (1):
test, btrace: more branch tracing tests
Markus Metzger (15):
disas: add precise instructions flag
source: add flags to print_source_lines ()
source, disasm: optionally prefix source lines with filename
thread, btrace: add generic branch trace support
cli, btrace: add btrace cli
configure: add check for perf_event header
configure: autoreconf
linux, btrace: perf_event based branch tracing
btrace, linux: add linux native btrace target ops
btrace, config: enable btrace for 32bit and 64bit linux native
test, btrace: add branch trace tests
xml, btrace: define btrace xml document style
remote, btrace: add branch trace remote ops
gdbserver, btrace: add generic btrace support
gdbserver, linux, btrace: add btrace support for linux-low
.gitignore | 2 +
gdb/Makefile.in | 14 +-
gdb/amd64-linux-nat.c | 2 +
gdb/btrace.c | 939 ++++++++++++++++++++++
gdb/btrace.h | 92 +++
gdb/command.h | 2 +-
gdb/common/linux-btrace.c | 368 +++++++++
gdb/common/linux-btrace.h | 76 ++
gdb/config.in | 3 +
gdb/config/i386/linux.mh | 3 +-
gdb/config/i386/linux64.mh | 2 +-
gdb/configure | 13 +
gdb/configure.ac | 2 +
gdb/disasm.c | 40 +-
gdb/disasm.h | 8 +-
gdb/features/btrace.dtd | 12 +
gdb/gdbserver/Makefile.in | 6 +-
gdb/gdbserver/config.in | 3 +
gdb/gdbserver/configure | 2 +-
gdb/gdbserver/configure.ac | 2 +-
gdb/gdbserver/configure.srv | 34 +-
gdb/gdbserver/gdbthread.h | 5 +
gdb/gdbserver/inferiors.c | 3 +
gdb/gdbserver/linux-low.c | 42 +
gdb/gdbserver/server.c | 171 ++++
gdb/gdbserver/target.h | 38 +
gdb/gdbthread.h | 4 +
gdb/i386-linux-nat.c | 2 +
gdb/infcmd.c | 2 +
gdb/linux-nat-btrace.c | 86 ++
gdb/linux-nat-btrace.h | 28 +
gdb/remote.c | 208 +++++
gdb/source.c | 19 +-
gdb/symtab.h | 6 +
gdb/target.c | 20 +
gdb/target.h | 36 +-
gdb/testsuite/configure.ac | 2 +-
gdb/testsuite/gdb.base/page.exp | 3 +-
gdb/testsuite/gdb.btrace/Makefile.in | 13 +
gdb/testsuite/gdb.btrace/a.s | 24 +
gdb/testsuite/gdb.btrace/allthreads_trace.exp | 270 +++++++
gdb/testsuite/gdb.btrace/b.s | 23 +
gdb/testsuite/gdb.btrace/dec.c | 4 +
gdb/testsuite/gdb.btrace/decrement.exp | 140 ++++
gdb/testsuite/gdb.btrace/decrement.s | 32 +
gdb/testsuite/gdb.btrace/disable_all.exp | 198 +++++
gdb/testsuite/gdb.btrace/enable.exp | 83 ++
gdb/testsuite/gdb.btrace/enable_all.exp | 201 +++++
gdb/testsuite/gdb.btrace/enable_range.exp | 198 +++++
gdb/testsuite/gdb.btrace/inc.c | 4 +
gdb/testsuite/gdb.btrace/list.exp | 169 ++++
gdb/testsuite/gdb.btrace/list.s | 68 ++
gdb/testsuite/gdb.btrace/list_function.c | 12 +
gdb/testsuite/gdb.btrace/list_function.exp | 59 ++
gdb/testsuite/gdb.btrace/list_options.exp | 107 +++
gdb/testsuite/gdb.btrace/main.s | 32 +
gdb/testsuite/gdb.btrace/main_asm.exp | 113 +++
gdb/testsuite/gdb.btrace/main_segv.exp | 84 ++
gdb/testsuite/gdb.btrace/main_segv.s | 28 +
gdb/testsuite/gdb.btrace/sanity_crash.exp | 69 ++
gdb/testsuite/gdb.btrace/sanity_crash.s | 52 ++
gdb/testsuite/gdb.btrace/thr_callback_32.s | 116 +++
gdb/testsuite/gdb.btrace/thr_callback_64.s | 116 +++
gdb/testsuite/gdb.btrace/threads.c | 96 +++
gdb/testsuite/gdb.btrace/threads_asm.c | 78 ++
gdb/testsuite/gdb.btrace/threads_auto.exp | 113 +++
gdb/testsuite/gdb.btrace/threads_independent.exp | 119 +++
gdb/testsuite/gdb.btrace/threads_nonstop.exp | 182 +++++
gdb/testsuite/gdb.btrace/trace_iteration.exp | 264 ++++++
gdb/testsuite/lib/btrace.exp | 72 ++
gdb/thread.c | 3 +
71 files changed, 5393 insertions(+), 49 deletions(-)
create mode 100644 gdb/btrace.c
create mode 100644 gdb/btrace.h
create mode 100644 gdb/common/linux-btrace.c
create mode 100644 gdb/common/linux-btrace.h
create mode 100644 gdb/features/btrace.dtd
create mode 100644 gdb/linux-nat-btrace.c
create mode 100644 gdb/linux-nat-btrace.h
create mode 100755 gdb/testsuite/gdb.btrace/Makefile.in
create mode 100755 gdb/testsuite/gdb.btrace/a.s
create mode 100755 gdb/testsuite/gdb.btrace/allthreads_trace.exp
create mode 100755 gdb/testsuite/gdb.btrace/b.s
create mode 100644 gdb/testsuite/gdb.btrace/dec.c
create mode 100755 gdb/testsuite/gdb.btrace/decrement.exp
create mode 100755 gdb/testsuite/gdb.btrace/decrement.s
create mode 100755 gdb/testsuite/gdb.btrace/disable_all.exp
create mode 100644 gdb/testsuite/gdb.btrace/enable.exp
create mode 100755 gdb/testsuite/gdb.btrace/enable_all.exp
create mode 100755 gdb/testsuite/gdb.btrace/enable_range.exp
create mode 100644 gdb/testsuite/gdb.btrace/inc.c
create mode 100644 gdb/testsuite/gdb.btrace/list.exp
create mode 100644 gdb/testsuite/gdb.btrace/list.s
create mode 100644 gdb/testsuite/gdb.btrace/list_function.c
create mode 100644 gdb/testsuite/gdb.btrace/list_function.exp
create mode 100755 gdb/testsuite/gdb.btrace/list_options.exp
create mode 100755 gdb/testsuite/gdb.btrace/main.s
create mode 100755 gdb/testsuite/gdb.btrace/main_asm.exp
create mode 100755 gdb/testsuite/gdb.btrace/main_segv.exp
create mode 100755 gdb/testsuite/gdb.btrace/main_segv.s
create mode 100755 gdb/testsuite/gdb.btrace/sanity_crash.exp
create mode 100755 gdb/testsuite/gdb.btrace/sanity_crash.s
create mode 100755 gdb/testsuite/gdb.btrace/thr_callback_32.s
create mode 100755 gdb/testsuite/gdb.btrace/thr_callback_64.s
create mode 100755 gdb/testsuite/gdb.btrace/threads.c
create mode 100755 gdb/testsuite/gdb.btrace/threads_asm.c
create mode 100755 gdb/testsuite/gdb.btrace/threads_auto.exp
create mode 100755 gdb/testsuite/gdb.btrace/threads_independent.exp
create mode 100755 gdb/testsuite/gdb.btrace/threads_nonstop.exp
create mode 100755 gdb/testsuite/gdb.btrace/trace_iteration.exp
create mode 100644 gdb/testsuite/lib/btrace.exp
next reply other threads:[~2012-05-10 15:15 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-10 15:15 markus.t.metzger [this message]
2012-05-10 15:16 ` [PATCH 01/16] disas: add precise instructions flag markus.t.metzger
2012-05-10 15:16 ` [PATCH 05/16] cli, btrace: add btrace cli markus.t.metzger
2012-05-10 16:44 ` Eli Zaretskii
2012-05-11 8:17 ` Metzger, Markus T
2012-05-10 15:17 ` [PATCH 10/16] btrace, config: enable btrace for 32bit and 64bit linux native markus.t.metzger
2012-05-10 15:17 ` [PATCH 04/16] thread, btrace: add generic branch trace support markus.t.metzger
2012-05-10 15:17 ` [PATCH 08/16] linux, btrace: perf_event based branch tracing markus.t.metzger
2012-05-10 15:17 ` [PATCH 11/16] test, btrace: add branch trace tests markus.t.metzger
2012-05-10 15:17 ` [PATCH 16/16] gdbserver, linux, btrace: add btrace support for linux-low markus.t.metzger
2012-05-10 15:17 ` [PATCH 14/16] remote, btrace: add branch trace remote ops markus.t.metzger
2012-05-10 15:17 ` [PATCH 03/16] source, disasm: optionally prefix source lines with filename markus.t.metzger
2012-05-10 15:17 ` [PATCH 02/16] source: add flags to print_source_lines () markus.t.metzger
2012-05-10 15:17 ` [PATCH 07/16] configure: autoreconf markus.t.metzger
2012-05-10 15:18 ` [PATCH 09/16] btrace, linux: add linux native btrace target ops markus.t.metzger
2012-05-10 15:18 ` [PATCH 13/16] xml, btrace: define btrace xml document style markus.t.metzger
2012-05-10 15:18 ` [PATCH 15/16] gdbserver, btrace: add generic btrace support markus.t.metzger
2012-05-10 15:18 ` [PATCH 06/16] configure: add check for perf_event header markus.t.metzger
2012-05-10 15:18 ` [PATCH 12/16] test, btrace: more branch tracing tests markus.t.metzger
2012-05-11 0:25 ` [PATCH 00/16] branch tracing support Hui Zhu
2012-05-11 8:17 ` Metzger, Markus T
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