From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 3871 invoked by alias); 23 May 2012 11:23:27 -0000 Received: (qmail 3855 invoked by uid 22791); 23 May 2012 11:23:24 -0000 X-SWARE-Spam-Status: No, hits=-7.1 required=5.0 tests=AWL,BAYES_00,KHOP_RCVD_UNTRUST,RCVD_IN_DNSWL_HI,T_RP_MATCHES_RCVD X-Spam-Check-By: sourceware.org Received: from mga09.intel.com (HELO mga09.intel.com) (134.134.136.24) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Wed, 23 May 2012 11:23:11 +0000 Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga102.jf.intel.com with ESMTP; 23 May 2012 04:23:10 -0700 X-ExtLoop1: 1 Received: from swsutil001.isw.intel.com ([10.237.237.11]) by orsmga002.jf.intel.com with ESMTP; 23 May 2012 04:23:09 -0700 Received: from ulslx001.iul.intel.com (ulslx001.iul.intel.com [172.28.207.63]) by swsutil001.isw.intel.com (8.13.6/8.13.6/MailSET/Hub) with ESMTP id q4NBN8lD016822; Wed, 23 May 2012 12:23:08 +0100 Received: from ulslx001.iul.intel.com (localhost [127.0.0.1]) by ulslx001.iul.intel.com with ESMTP id q4NBN7TC020298; Wed, 23 May 2012 13:23:07 +0200 Received: (from mmetzger@localhost) by ulslx001.iul.intel.com with id q4NBN7nI020294; Wed, 23 May 2012 13:23:07 +0200 From: markus.t.metzger@intel.com To: kettenis@gnu.org Cc: gdb-patches@sourceware.org, markus.t.metzger@gmail.com, Markus Metzger Subject: [PATCH 00/16] branch tracing support (resend) Date: Wed, 23 May 2012 11:23:00 -0000 Message-Id: <1337772151-20265-1-git-send-email-markus.t.metzger@intel.com> X-IsSubscribed: yes Mailing-List: contact gdb-patches-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-patches-owner@sourceware.org X-SW-Source: 2012-05/txt/msg00867.txt.bz2 From: Markus Metzger I am resending the patch series originally sent on May 10. 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. 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 : sub $0x8,%rsp ../../../git/gdb/ui-file.c:176 if (file->magic != &ui_file_magic) 0x0000000000635414 : cmpq $0xb33b94,(%rdi) 0x000000000063541b : jne 0x635426 ../../../git/gdb/ui-file.c:177 internal_error (__FILE__, __LINE__, 0x000000000063541d : 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 : add $0x8,%rsp 0x0000000000635425 : 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