From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from nx236.node02.secure-mailgate.com (nx236.node02.secure-mailgate.com [192.162.87.236]) by sourceware.org (Postfix) with ESMTPS id BEFFD38515FD for ; Sat, 10 Apr 2021 21:17:57 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org BEFFD38515FD Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=trande.de Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=zied.guermazi@trande.de Received: from host202.checkdomain.de ([185.137.168.148]) by node02.secure-mailgate.com with esmtps (TLSv1.2:AES128-GCM-SHA256:128) (Exim 4.92) (envelope-from ) id 1lVKzL-00AU6f-Js for gdb-patches@sourceware.org; Sat, 10 Apr 2021 23:17:56 +0200 X-SecureMailgate-Identity: zied.guermazi@trande.de;host202.checkdomain.de Received: from Trande0001.fritz.box (x4db55ac6.dyn.telefonica.de [77.181.90.198]) (Authenticated sender: zied.guermazi@trande.de) by host202.checkdomain.de (Postfix) with ESMTPSA id 83C0E38802F; Sat, 10 Apr 2021 23:17:54 +0200 (CEST) X-SecureMailgate-Identity: zied.guermazi@trande.de;host202.checkdomain.de From: Zied Guermazi To: gdb-patches@sourceware.org Cc: Zied Guermazi Subject: [PATCH v4 2/7] add btrace coresight related commands Date: Sat, 10 Apr 2021 23:17:39 +0200 Message-Id: <20210410211744.7662-3-zied.guermazi@trande.de> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210410211744.7662-1-zied.guermazi@trande.de> References: <20210410211744.7662-1-zied.guermazi@trande.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-PPP-Message-ID: <20210410211754.2587152.60212@host202.checkdomain.de> X-PPP-Vhost: trande.de X-Originating-IP: 185.137.168.148 X-SecureMailgate-Domain: host202.checkdomain.de X-SecureMailgate-Username: 185.137.168.148 Authentication-Results: secure-mailgate.com; auth=pass smtp.auth=185.137.168.148@host202.checkdomain.de X-SecureMailgate-Outgoing-Class: ham X-SecureMailgate-Outgoing-Evidence: SB/global_tokens (8.2150586358e-06) X-Recommended-Action: accept X-Filter-ID: Pt3MvcO5N4iKaDQ5O6lkdGlMVN6RH8bjRMzItlySaT/bUFWm/aDMbEIiyaap2r3+PUtbdvnXkggZ 3YnVId/Y5jcf0yeVQAvfjHznO7+bT5wgSQOko5ya3orWH1MkzQXa2oPZqVS5i0KNMNtVCi0tRw/C h5SE4jAyhe1COeASyU/6AigcGJm6r83H+BAH3miM4ld5rdi2ZxohSIq+dqifZoVY3IcDeckxfee+ NDQ6wUl3g/WbBekzB3IK8RY7uNAEcY1i02TJefD768F5oV2iM8C0xB8SW32wy2mbLZXD/P+t8ebU KGAHl/zKrzp4ep5Out5PpkrBQueV+Yg5wqLK/LXDLRhLABXs81Y8X58rOcwLMK9HC+pUQBAyR03+ Yzd8ARsynxDH0D+SLDJWdESXziw50BoEYB44qFPH6be8XgtMhiMRK0C70oXENkWqJaNtpfX1h/uL cDQJCG2naSen4S0KEAnwyE9dte+FkDKSV99EDBffVZVjmVaNbG4ZJG7F2RgQw3d3zmVen9wp80qQ nk5/t+UnI24Hleg6UWHjmGlvyMjbyNpr4xR6RL2C9+qlIny++hg9dJLqN5zmWqF/oNe6FVV7drXD mtOldfpWzeXX3Vs0+OVZ6o01Ur0UfsSgVqahaS1Xn3nbmTfiR5jKRrn6qQ/in5NA6oG3bP7L0DnU JleWftUulkbC12DciiOUAQy3WRoWhjJ4ABRp4spTBKsH/WzE78WB+6LKJkk4wWAos7Vk+4I720v2 H9/mQncon4T7OymHvLHT1C7MG/JfB70B9g9toAkeOe6wfobyQhNFXdcOXXm38/++NKnQrU/tOnYQ psOL3D4WKYPb9hiQqsMR3pimW+H6hrLs7bihM+ep7Sq+vnK5vq335GkOmYDoHPDsFqo1t5bEBI0m 4NsB3v57rn7svr0CR7c5hAqOktwf0pFELgZzpj7YZ1nZbFwmk5cOIuq9/nEj4eE6xpGJ7zwJWw42 swm4bO6gacpMpzI93NKmpOx249IDJgHZhSqYgJJFthw94zyDVRbqPxaxhXoarW2MF3gazIzgmJi5 UydShOH22SRgbHWq1uciMDoDhcd9NG1JDoOknqc6qrb4AiZPF6HXPq5gLm4Q4ElmvUALMK9HC+pU QBAyR03+Yzd87yCUgX8YuF5WBQr1Bq861zvA3BXN5HBbApl4eIrLaWewxjLyThsLecb51qdaSQev MS+4ayUpOtEhdxekWDmK9g== X-Report-Abuse-To: spam@node04.secure-mailgate.com X-Spam-Status: No, score=-10.4 required=5.0 tests=BAYES_00, GIT_PATCH_0, JMQ_SPF_NEUTRAL, KAM_DMARC_STATUS, RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 10 Apr 2021 21:18:00 -0000 This patch extends the commands needed for using branch tracing with ARM CoreSight traces. Those commands are: set record btrace etm sink set record btrace etm buffer-size record btrace etm gdb/ChangeLog * NEWS: list new commands for extending btrace to support using ARM CoreSight Traces. * record-btrace.c (record_btrace_print_etm_conf): New. (record_btrace_print_conf): handle BTRACE_FORMAT_ETM. (cmd_record_btrace_etm_start): New. (cmd_record_btrace_start): handle starting ETM tracing. (cmd_show_record_btrace_cpu): extend for ARM cpus. (show_record_etm_buffer_size_value): New. (_initialize_record_btrace): add commands for ETM traces. (record_start): add starting ETM traces. gdb/doc/ChangeLog * gdb.texinfo (Process Record and Replay): Document extending GDB btrace commands to support using ARM CoreSight traces. gdbsupport/ChangeLog * btrace-common.h (btrace_format): add BTRACE_FORMAT_ETM to the enum. (btrace_config_etm): new struct. (btrace_config): add btrace_config_etm etm. * btrace-common.cc (btrace_format_string): add BTRACE_FORMAT_ETM. (btrace_format_short_string): add BTRACE_FORMAT_ETM. --- gdb/NEWS | 16 +++++ gdb/doc/gdb.texinfo | 51 ++++++++++++++- gdb/record-btrace.c | 121 ++++++++++++++++++++++++++++++++++-- gdb/record.c | 2 + gdbsupport/btrace-common.cc | 6 ++ gdbsupport/btrace-common.h | 22 ++++++- 6 files changed, 211 insertions(+), 7 deletions(-) diff --git a/gdb/NEWS b/gdb/NEWS index 7f5a745d0c0..0dbd89eb360 100644 --- a/gdb/NEWS +++ b/gdb/NEWS @@ -2,6 +2,7 @@ (Organized release by release) *** Changes since GDB 10 +* Record btrace now supports using ARM CoreSight ETM traces. * Building GDB now requires GMP (The GNU Multiple Precision Arithmetic Library). @@ -35,6 +36,21 @@ * New commands +record btrace etm +record etm + Start branch trace recording using ARM CoreSight trace format (ETM). + +set|show record btrace etm buffer-size + Set and show the size of the ring buffer used for branch tracing in + ETM format. + The obtained size may differ from the requested size. Use "info + record" to see the obtained buffer size. + +set|show record btrace etm sink + Set and show the trace sink used for branch tracing in + ETM format. + Use "default" to reset it to default sink. + set debug event-loop show debug event-loop Control the display of debug output about GDB's event loop. diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo index 80ccf74a049..bd5b2c91869 100644 --- a/gdb/doc/gdb.texinfo +++ b/gdb/doc/gdb.texinfo @@ -7371,15 +7371,19 @@ For architecture environments that support process record and replay, @kindex record btrace @kindex record btrace bts @kindex record btrace pt +@kindex record btrace etm @kindex record bts @kindex record pt +@kindex record etm @kindex rec @kindex rec full @kindex rec btrace @kindex rec btrace bts @kindex rec btrace pt +@kindex rec btrace etm @kindex rec bts @kindex rec pt +@kindex rec etm @item record @var{method} This command starts the process record and replay target. The recording method can be specified as parameter. Without a parameter @@ -7393,7 +7397,7 @@ replay implementation. This method allows replaying and reverse execution. @item btrace @var{format} -Hardware-supported instruction recording, supported on Intel +Hardware-supported instruction recording, supported on Intel and ARM processors. This method does not record data. Further, the data is collected in a ring buffer so old data will be overwritten when the buffer is full. It allows limited reverse execution. Variables and @@ -7427,6 +7431,13 @@ Decoding the recorded execution trace, on the other hand, is more expensive than decoding @acronym{BTS} trace. This is mostly due to the increased number of instructions to process. You should increase the buffer-size with care. + +@item etm +@cindex ARM CoreSight Trace +Use the @dfn{ARM CoreSight Trace} recording format. In this +format, @acronym{ETM, Extended Trace Macrocell} stores the processor +execution trace in a compressed form that is afterwards +decoded by @value{GDBN}. @end table Not all recording formats may be available on all processors. @@ -7574,6 +7585,12 @@ and to read-write memory. Beware that the accessed memory corresponds to the live target and not necessarily to the current replay position. +@item set record btrace etm sink @var{sink} +Set ARM CoreSight ETM sink to collect traces. +On @sc{gnu}/Linux systems, possible values for @var{sink} are the name of the +files in the directory @file{/sys/bus/event_source/devices/cs_etm/sinks/}. +Use the value @kbd{default} to reset it to default sink. + @item set record btrace cpu @var{identifier} Set the processor to be used for enabling workarounds for processor errata when decoding the trace. @@ -7637,6 +7654,9 @@ Recorded 84872 instructions in 3189 functions (0 gaps) for thread 1 (...). @item show record btrace replay-memory-access Show the current setting of @code{replay-memory-access}. +@item show record btrace etm sink +Show ARM CoreSight ETM sink. + @item show record btrace cpu Show the processor to be used for enabling trace decode errata workarounds. @@ -7688,6 +7708,29 @@ also need longer to process the branch trace data before it can be used. Show the current setting of the requested ring buffer size for branch tracing in Intel Processor Trace format. +@kindex set record btrace etm +@item set record btrace etm buffer-size @var{size} +@itemx set record btrace etm buffer-size unlimited +Set the requested ring buffer size for branch tracing in ARM +CoreSight ETM Trace format. Default is 16KB. + +If @var{size} is a positive number, then @value{GDBN} will try to +allocate a buffer of at least @var{size} bytes for each new thread +that uses the btrace recording method and the ARM CoreSight ETM +format. The actually obtained buffer size may differ from the +requested @var{size}. Use the @code{info record} command to see the +actual buffer size for each thread. + +If @var{limit} is @code{unlimited} or zero, @value{GDBN} will try to +allocate a buffer of 4MB. + +Bigger buffers mean longer traces. On the other hand, @value{GDBN} will +also need longer to process the branch trace data before it can be used. + +@item show record btrace etm buffer-size @var{size} +Show the current setting of the requested ring buffer size for branch +tracing in ARM CoreSight ETM Trace format. + @kindex info record @item info record Show various statistics about the recording depending on the recording @@ -7739,6 +7782,12 @@ For the @code{pt} recording format, it also shows: @item Size of the perf ring buffer. @end itemize + +For the @code{etm} recording format, it also shows: +@itemize @bullet +@item +Size of the perf ring buffer. +@end itemize @end table @kindex record delete diff --git a/gdb/record-btrace.c b/gdb/record-btrace.c index d9cc7a3b6d8..3af275f03a8 100644 --- a/gdb/record-btrace.c +++ b/gdb/record-btrace.c @@ -201,6 +201,10 @@ static struct cmd_list_element *show_record_btrace_bts_cmdlist; static struct cmd_list_element *set_record_btrace_pt_cmdlist; static struct cmd_list_element *show_record_btrace_pt_cmdlist; +/* Command lists for "set/show record btrace etm". */ +static struct cmd_list_element *set_record_btrace_etm_cmdlist; +static struct cmd_list_element *show_record_btrace_etm_cmdlist; + /* Command list for "set record btrace cpu". */ static struct cmd_list_element *set_record_btrace_cpu_cmdlist; @@ -525,6 +529,22 @@ record_btrace_print_pt_conf (const struct btrace_config_pt *conf) } } +/* Print an ARM Processor Trace configuration. */ + +static void +record_btrace_print_etm_conf (const struct btrace_config_etm *conf) +{ + unsigned int size; + + size = conf->size; + if (size > 0) + { + const char *suffix; + suffix = record_btrace_adjust_size (&size); + printf_unfiltered (_("Buffer size: %u%s.\n"), size, suffix); + } +} + /* Print a branch tracing configuration. */ static void @@ -545,6 +565,10 @@ record_btrace_print_conf (const struct btrace_config *conf) case BTRACE_FORMAT_PT: record_btrace_print_pt_conf (&conf->pt); return; + + case BTRACE_FORMAT_ETM: + record_btrace_print_etm_conf (&conf->etm); + return; } internal_error (__FILE__, __LINE__, _("Unknown branch trace format.")); @@ -2675,7 +2699,7 @@ record_btrace_target::stop (ptid_t ptid) tp->btrace.flags |= BTHR_STOP; } } - } +} /* The can_execute_reverse method of target record-btrace. */ @@ -2936,6 +2960,27 @@ cmd_record_btrace_pt_start (const char *args, int from_tty) } } +/* Start recording in ARM CoreSight ETM Trace format. */ + +static void +cmd_record_btrace_etm_start (const char *args, int from_tty) +{ + if (args != nullptr && *args != 0) + error (_("Invalid argument.")); + + record_btrace_conf.format = BTRACE_FORMAT_ETM; + + try + { + execute_command ("target record-btrace", from_tty); + } + catch (const gdb_exception &exception) + { + record_btrace_conf.format = BTRACE_FORMAT_NONE; + throw; + } +} + /* Alias for "target record". */ static void @@ -2950,7 +2995,7 @@ cmd_record_btrace_start (const char *args, int from_tty) { execute_command ("target record-btrace", from_tty); } - catch (const gdb_exception &exception) + catch (const gdb_exception &exception_pt) { record_btrace_conf.format = BTRACE_FORMAT_BTS; @@ -2958,10 +3003,19 @@ cmd_record_btrace_start (const char *args, int from_tty) { execute_command ("target record-btrace", from_tty); } - catch (const gdb_exception &ex) + catch (const gdb_exception &exception_bts) { - record_btrace_conf.format = BTRACE_FORMAT_NONE; - throw; + record_btrace_conf.format = BTRACE_FORMAT_ETM; + + try + { + execute_command ("target record-btrace", from_tty); + } + catch (const gdb_exception &ex) + { + record_btrace_conf.format = BTRACE_FORMAT_NONE; + throw; + } } } } @@ -3102,6 +3156,17 @@ show_record_pt_buffer_size_value (struct ui_file *file, int from_tty, value); } +/* The "record etm buffer-size" show value function. */ + +static void +show_record_etm_buffer_size_value (struct ui_file *file, int from_tty, + struct cmd_list_element *c, + const char *value) +{ + fprintf_filtered (file, _("The record/replay etm buffer size is %s.\n"), + value); +} + /* Initialize btrace commands. */ void _initialize_record_btrace (); @@ -3165,6 +3230,13 @@ When set to \"none\", errata workarounds are disabled."), "set record btrace cpu ", 1, &set_record_btrace_cmdlist); + add_cmd ("etm", class_obscure, cmd_record_btrace_etm_start, + _("\ +Start branch trace recording in ARM CoreSight ETM Trace format.\n\n\ +This format may not be available on all processors."), + &record_btrace_cmdlist); + add_alias_cmd ("etm", "btrace etm", class_obscure, 1, &record_cmdlist); + add_cmd ("auto", class_support, cmd_set_record_btrace_cpu_auto, _("\ Automatically determine the cpu to be used for trace decode."), &set_record_btrace_cpu_cmdlist); @@ -3226,6 +3298,43 @@ to see the actual buffer size."), NULL, show_record_pt_buffer_size_value, &set_record_btrace_pt_cmdlist, &show_record_btrace_pt_cmdlist); + add_basic_prefix_cmd ("etm", class_support, + _("Set record btrace etm options."), + &set_record_btrace_etm_cmdlist, + "set record btrace etm ", 0, + &set_record_btrace_cmdlist); + + add_show_prefix_cmd ("etm", class_support, + _("Show record btrace etm options."), + &show_record_btrace_etm_cmdlist, + "show record btrace etm ", 0, + &show_record_btrace_cmdlist); + + add_setshow_uinteger_cmd ("buffer-size", no_class, + &record_btrace_conf.etm.size, + _("Set the record/replay etm buffer size."), + _("Show the record/replay etm buffer size."), _("\ +Bigger buffers allow longer recording but also take more time to process \ +the recorded execution.\n\ +The actual buffer size may differ from the requested size. Use \"info record\"\ + to see the actual buffer size."), NULL, show_record_etm_buffer_size_value, + &set_record_btrace_etm_cmdlist, + &show_record_btrace_etm_cmdlist); + + add_setshow_string_cmd ("sink", no_class, + &record_btrace_conf.etm.sink, + _("Set the record/replay ETM sink device."), + _("Show the record/replay ETM sink device."), + _("\ +Sink device is the device that intercepts ETM traces and collects or routes \ +them out of the System on Chip.\n\ +The list of available sinks on linux targets corresponds to the files in \ +the directory \"/sys/bus/event_source/devices/cs_etm/sinks/\".\n\ +value \"default\" reset it to default sink"), + NULL, NULL, + &set_record_btrace_etm_cmdlist, + &show_record_btrace_etm_cmdlist); + add_target (record_btrace_target_info, record_btrace_target_open); bfcache = htab_create_alloc (50, bfcache_hash, bfcache_eq, NULL, @@ -3233,4 +3342,6 @@ to see the actual buffer size."), NULL, show_record_pt_buffer_size_value, record_btrace_conf.bts.size = 64 * 1024; record_btrace_conf.pt.size = 16 * 1024; +#define DEFAULT_ETM_BUFFER_SIZE (8 * 1024) + record_btrace_conf.etm.size = DEFAULT_ETM_BUFFER_SIZE; } diff --git a/gdb/record.c b/gdb/record.c index cd541b56f43..c9de7b77370 100644 --- a/gdb/record.c +++ b/gdb/record.c @@ -118,6 +118,8 @@ record_start (const char *method, const char *format, int from_tty) execute_command_to_string ("record btrace bts", from_tty, false); else if (strcmp (format, "pt") == 0) execute_command_to_string ("record btrace pt", from_tty, false); + else if (strcmp (format, "etm") == 0) + execute_command_to_string ("record btrace etm", from_tty, false); else error (_("Invalid format.")); } diff --git a/gdbsupport/btrace-common.cc b/gdbsupport/btrace-common.cc index 4f9ef855e74..79ff21de44b 100644 --- a/gdbsupport/btrace-common.cc +++ b/gdbsupport/btrace-common.cc @@ -36,6 +36,9 @@ btrace_format_string (enum btrace_format format) case BTRACE_FORMAT_PT: return _("Intel Processor Trace"); + + case BTRACE_FORMAT_ETM: + return _("ARM Processor CoreSight ETM Trace"); } internal_error (__FILE__, __LINE__, _("Unknown branch trace format")); @@ -56,6 +59,9 @@ btrace_format_short_string (enum btrace_format format) case BTRACE_FORMAT_PT: return "pt"; + + case BTRACE_FORMAT_ETM: + return "etm"; } internal_error (__FILE__, __LINE__, _("Unknown branch trace format")); diff --git a/gdbsupport/btrace-common.h b/gdbsupport/btrace-common.h index 26d26ec957f..153b977723a 100644 --- a/gdbsupport/btrace-common.h +++ b/gdbsupport/btrace-common.h @@ -63,7 +63,10 @@ enum btrace_format BTRACE_FORMAT_BTS, /* Branch trace is in Intel Processor Trace format. */ - BTRACE_FORMAT_PT + BTRACE_FORMAT_PT, + + /* Branch trace is ARM CoreSight ETM format. */ + BTRACE_FORMAT_ETM }; /* An enumeration of cpu vendors. */ @@ -119,6 +122,20 @@ struct btrace_config_pt unsigned int size; }; +/* An ARM CoreSight ETM Trace configuration. */ + +struct btrace_config_etm +{ + /* The size of the branch trace buffer in bytes. + + This is unsigned int and not size_t since it is registered as + control variable for "set record btrace etm buffer-size". */ + unsigned int size; + + /* The sink used to collect the traces. */ + char *sink; +}; + /* A branch tracing configuration. This describes the requested configuration as well as the actually @@ -136,6 +153,9 @@ struct btrace_config /* The Intel Processor Trace format configuration. */ struct btrace_config_pt pt; + + /* The ARM CoreSight ETM Trace configuration. */ + struct btrace_config_etm etm; }; /* Branch trace in BTS format. */ -- 2.25.1