969c39fbcd
Read branch trace data incrementally and extend the current trace rather than discarding it and reading the entire trace buffer each time. If the branch trace buffer overflowed, we can't extend the current trace so we discard it and start anew by reading the entire branch trace buffer. 2014-01-16 Markus Metzger <markus.t.metzger@intel.com> * common/linux-btrace.c (perf_event_read_bts, linux_read_btrace): Support delta reads. (linux_disable_btrace): Change return type. * common/linux-btrace.h (linux_read_btrace): Change parameters and return type to allow error reporting. Update users. (linux_disable_btrace): Change return type. Update users. * common/btrace-common.h (btrace_read_type) <BTRACE_READ_DELTA>: New. (btrace_error): New. (btrace_block) <begin>: Comment on BEGIN == 0. * btrace.c (btrace_compute_ftrace): Start from the end of the current trace. (btrace_stitch_trace, btrace_clear_history): New. (btrace_fetch): Read delta trace, return if replaying. (btrace_clear): Move clear history code to btrace_clear_history. (parse_xml_btrace): Throw an error if parsing failed. * target.h (struct target_ops) <to_read_btrace>: Change parameters and return type to allow error reporting. (target_read_btrace): Change parameters and return type to allow error reporting. * target.c (target_read_btrace): Update. * remote.c (remote_read_btrace): Support delta reads. Pass errors on. * NEWS: Announce it. gdbserver/ * target.h (target_ops) <read_btrace>: Change parameters and return type to allow error reporting. * server.c (handle_qxfer_btrace): Support delta reads. Pass trace reading errors on. * linux-low.c (linux_low_read_btrace): Pass trace reading errors on. (linux_low_disable_btrace): New.
97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
/* Branch trace support for GDB, the GNU debugger.
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Copyright (C) 2013-2014 Free Software Foundation, Inc.
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Contributed by Intel Corp. <markus.t.metzger@intel.com>.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef BTRACE_COMMON_H
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#define BTRACE_COMMON_H
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/* Branch tracing (btrace) is a per-thread control-flow execution trace of the
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inferior. For presentation purposes, the branch trace is represented as a
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list of sequential control-flow blocks, one such list per thread. */
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#ifdef GDBSERVER
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# include "server.h"
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#else
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# include "defs.h"
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#endif
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#include "vec.h"
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/* A branch trace block.
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This represents a block of sequential control-flow. Adjacent blocks will be
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connected via calls, returns, or jumps. The latter can be direct or
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indirect, conditional or unconditional. Branches can further be
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asynchronous, e.g. interrupts. */
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struct btrace_block
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{
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/* The address of the first byte of the first instruction in the block.
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The address may be zero if we do not know the beginning of this block,
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such as for the first block in a delta trace. */
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CORE_ADDR begin;
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/* The address of the first byte of the last instruction in the block. */
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CORE_ADDR end;
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};
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/* Branch trace is represented as a vector of branch trace blocks starting with
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the most recent block. */
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typedef struct btrace_block btrace_block_s;
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/* Define functions operating on a vector of branch trace blocks. */
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DEF_VEC_O (btrace_block_s);
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/* Target specific branch trace information. */
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struct btrace_target_info;
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/* Enumeration of btrace read types. */
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enum btrace_read_type
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{
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/* Send all available trace. */
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BTRACE_READ_ALL,
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/* Send all available trace, if it changed. */
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BTRACE_READ_NEW,
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/* Send the trace since the last request. This will fail if the trace
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buffer overflowed. */
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BTRACE_READ_DELTA
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};
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/* Enumeration of btrace errors. */
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enum btrace_error
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{
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/* No error. Everything is OK. */
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BTRACE_ERR_NONE,
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/* An unknown error. */
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BTRACE_ERR_UNKNOWN,
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/* Branch tracing is not supported on this system. */
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BTRACE_ERR_NOT_SUPPORTED,
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/* The branch trace buffer overflowed; no delta read possible. */
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BTRACE_ERR_OVERFLOW
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};
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#endif /* BTRACE_COMMON_H */
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