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[patch v3 00/16] branch tracing support for Atom
- From: markus dot t dot metzger at intel dot com
- To: gdb-patches at sourceware dot org
- Cc: markus dot t dot metzger at gmail dot com, jan dot kratochvil at redhat dot com, palves at redhat dot com, tromey at redhat dot com, kettenis at gnu dot org, Markus Metzger <markus dot t dot metzger at intel dot com>
- Date: Tue, 14 Aug 2012 14:59:15 +0200
- Subject: [patch v3 00/16] branch tracing support for Atom
From: Markus Metzger <markus.t.metzger@intel.com>
If I counted correctly, this is the third version, not counting the identical
resend of the first version.
I incorporated review comments from Jan and Tom.
There are still open points regarding documentation, which is completely
missing, and a comment from Tom about the cli, on which the communication got
stuck.
There's a new patch at the end of the series to restrict the feature to Atom
processors using a cpuid whitelist.
The first four patches are generic and may find usage outside of this
series. Maybe there's a chance to approve them independently so the series gets
less intimidating to review.
Here's an overview of the feature:
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. I do expect some discussion around the commands and their
exact spelling and would therefore postpone documentation.
- "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):
gdbserver, build: add -DGDBSERVER
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
linux, btrace: perf_event based branch tracing
linux, i386, amd64: enable btrace for 32bit and 64bit linux native
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
test, btrace: add branch tracing tests
btrace, x86: restrict to Atom
gdb/Makefile.in | 13 +-
gdb/amd64-linux-nat.c | 51 ++
gdb/btrace.c | 866 ++++++++++++++++++++++
gdb/btrace.h | 77 ++
gdb/command.h | 2 +-
gdb/common/btrace-common.h | 56 ++
gdb/common/linux-btrace.c | 382 ++++++++++
gdb/common/linux-btrace.h | 76 ++
gdb/config.in | 3 +
gdb/config/i386/linux.mh | 3 +-
gdb/config/i386/linux64.mh | 2 +-
gdb/configure | 2 +-
gdb/configure.ac | 2 +-
gdb/disasm.c | 38 +-
gdb/disasm.h | 8 +-
gdb/features/btrace.dtd | 12 +
gdb/gdbserver/Makefile.in | 33 +-
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 | 44 ++
gdb/gdbserver/linux-low.h | 2 +
gdb/gdbserver/linux-x86-low.c | 31 +
gdb/gdbserver/server.c | 167 +++++
gdb/gdbserver/target.h | 33 +
gdb/gdbthread.h | 4 +
gdb/i386-linux-nat.c | 51 ++
gdb/i386-linux-tdep.c | 34 +
gdb/i386-linux-tdep.h | 3 +
gdb/infcmd.c | 2 +
gdb/remote.c | 157 ++++
gdb/source.c | 21 +-
gdb/symtab.h | 14 +-
gdb/target.c | 89 +++
gdb/target.h | 39 +-
gdb/testsuite/Makefile.in | 3 +-
gdb/testsuite/configure | 3 +-
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 | 23 +
gdb/testsuite/gdb.btrace/allthreads_trace.exp | 345 +++++++++
gdb/testsuite/gdb.btrace/amd64-thr-callback.S | 116 +++
gdb/testsuite/gdb.btrace/b.S | 23 +
gdb/testsuite/gdb.btrace/dec.c | 23 +
gdb/testsuite/gdb.btrace/decrement.S | 32 +
gdb/testsuite/gdb.btrace/decrement.exp | 141 ++++
gdb/testsuite/gdb.btrace/disable_all.exp | 279 +++++++
gdb/testsuite/gdb.btrace/enable.exp | 94 +++
gdb/testsuite/gdb.btrace/enable_all.exp | 282 +++++++
gdb/testsuite/gdb.btrace/enable_range.exp | 281 +++++++
gdb/testsuite/gdb.btrace/i386-thr-callback.S | 116 +++
gdb/testsuite/gdb.btrace/inc.c | 23 +
gdb/testsuite/gdb.btrace/list.exp | 175 +++++
gdb/testsuite/gdb.btrace/list_function.c | 31 +
gdb/testsuite/gdb.btrace/list_function.exp | 50 ++
gdb/testsuite/gdb.btrace/list_options.exp | 107 +++
gdb/testsuite/gdb.btrace/main.S | 36 +
gdb/testsuite/gdb.btrace/main_asm.exp | 109 +++
gdb/testsuite/gdb.btrace/main_segv.S | 32 +
gdb/testsuite/gdb.btrace/main_segv.exp | 84 +++
gdb/testsuite/gdb.btrace/threads.c | 96 +++
gdb/testsuite/gdb.btrace/threads_asm.c | 78 ++
gdb/testsuite/gdb.btrace/threads_auto.exp | 123 +++
gdb/testsuite/gdb.btrace/threads_independent.exp | 125 ++++
gdb/testsuite/gdb.btrace/threads_nonstop.exp | 231 ++++++
gdb/testsuite/gdb.btrace/trace_iteration.exp | 265 +++++++
gdb/testsuite/gdb.btrace/x86-list.S | 70 ++
gdb/testsuite/lib/btrace.exp | 78 ++
gdb/thread.c | 4 +
73 files changed, 5796 insertions(+), 66 deletions(-)
create mode 100644 gdb/btrace.c
create mode 100644 gdb/btrace.h
create mode 100644 gdb/common/btrace-common.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 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/amd64-thr-callback.S
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.S
create mode 100755 gdb/testsuite/gdb.btrace/decrement.exp
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 100755 gdb/testsuite/gdb.btrace/i386-thr-callback.S
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_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.S
create mode 100755 gdb/testsuite/gdb.btrace/main_segv.exp
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/gdb.btrace/x86-list.S
create mode 100644 gdb/testsuite/lib/btrace.exp
- Follow-Ups:
- [patch v3 02/16] disas: add precise instructions flag
- From: markus . t . metzger
- [patch v3 04/16] source, disasm: optionally prefix source lines with filename
- From: markus . t . metzger
- [patch v3 07/16] configure: add check for perf_event header
- From: markus . t . metzger
- [patch v3 10/16] xml, btrace: define btrace xml document style
- From: markus . t . metzger
- [patch v3 03/16] source: add flags to print_source_lines ()
- From: markus . t . metzger
- [patch v3 11/16] remote, btrace: add branch trace remote ops
- From: markus . t . metzger
- [patch v3 09/16] linux, i386, amd64: enable btrace for 32bit and 64bit linux native
- From: markus . t . metzger
- [patch v3 13/16] gdbserver, linux, btrace: add btrace support for linux-low
- From: markus . t . metzger
- [patch v3 05/16] thread, btrace: add generic branch trace support
- From: markus . t . metzger
- [patch v3 08/16] linux, btrace: perf_event based branch tracing
- From: markus . t . metzger
- [patch v3 01/16] gdbserver, build: add -DGDBSERVER
- From: markus . t . metzger
- [patch v3 12/16] gdbserver, btrace: add generic btrace support
- From: markus . t . metzger
- [patch v3 16/16] btrace, x86: restrict to Atom
- From: markus . t . metzger
- [patch v3 06/16] cli, btrace: add btrace cli
- From: markus . t . metzger
- [patch v3 14/16] test, btrace: add branch tracing tests
- From: markus . t . metzger
- [patch v3 15/16] test, btrace: more branch tracing tests
- From: markus . t . metzger