2013-03-11 09:24:07 +01:00
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/* Linux-dependent part of branch trace support for GDB, and GDBserver.
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2014-01-01 04:54:24 +01:00
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Copyright (C) 2013-2014 Free Software Foundation, Inc.
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2013-03-11 09:24:07 +01:00
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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 LINUX_BTRACE_H
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#define LINUX_BTRACE_H
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#include "btrace-common.h"
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#include "config.h"
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#include "vec.h"
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#include "ptid.h"
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#include <stddef.h>
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#include <stdint.h>
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#if HAVE_LINUX_PERF_EVENT_H
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# include <linux/perf_event.h>
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#endif
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/* Branch trace target information per thread. */
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struct btrace_target_info
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{
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#if HAVE_LINUX_PERF_EVENT_H
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/* The Linux perf_event configuration for collecting the branch trace. */
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struct perf_event_attr attr;
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/* The ptid of this thread. */
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ptid_t ptid;
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/* The mmap configuration mapping the branch trace perf_event buffer.
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file .. the file descriptor
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buffer .. the mmapped memory buffer
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size .. the buffer's size in pages without the configuration page
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data_head .. the data head from the last read */
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int file;
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void *buffer;
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size_t size;
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unsigned long data_head;
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#endif /* HAVE_LINUX_PERF_EVENT_H */
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/* The size of a pointer in bits for this thread.
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The information is used to identify kernel addresses in order to skip
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records from/to kernel space. */
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int ptr_bits;
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};
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/* Check whether branch tracing is supported. */
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extern int linux_supports_btrace (void);
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/* Enable branch tracing for @ptid. */
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extern struct btrace_target_info *linux_enable_btrace (ptid_t ptid);
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/* Disable branch tracing and deallocate @tinfo. */
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extern int linux_disable_btrace (struct btrace_target_info *tinfo);
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/* Read branch trace data. */
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extern VEC (btrace_block_s) *linux_read_btrace (struct btrace_target_info *,
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enum btrace_read_type);
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#endif /* LINUX_BTRACE_H */
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