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/* Linux-dependent part of branch trace support for GDB, and GDBserver.
Copyright (C) 2013-2014 Free Software Foundation, Inc.
Contributed by Intel Corp. <markus.t.metzger@intel.com>
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef LINUX_BTRACE_H
#define LINUX_BTRACE_H
#include "btrace-common.h"
#include "config.h"
#include "vec.h"
#include "ptid.h"
#include <stddef.h>
#include <stdint.h>
#if HAVE_LINUX_PERF_EVENT_H
# include <linux/perf_event.h>
#endif
/* Branch trace target information per thread. */
struct btrace_target_info
{
#if HAVE_LINUX_PERF_EVENT_H
/* The Linux perf_event configuration for collecting the branch trace. */
struct perf_event_attr attr;
/* The ptid of this thread. */
ptid_t ptid;
/* The mmap configuration mapping the branch trace perf_event buffer.
file .. the file descriptor
buffer .. the mmapped memory buffer
size .. the buffer's size in pages without the configuration page
data_head .. the data head from the last read */
int file;
void *buffer;
size_t size;
unsigned long data_head;
#endif /* HAVE_LINUX_PERF_EVENT_H */
/* The size of a pointer in bits for this thread.
The information is used to identify kernel addresses in order to skip
records from/to kernel space. */
int ptr_bits;
};
/* Check whether branch tracing is supported. */
extern int linux_supports_btrace (void);
/* Enable branch tracing for @ptid. */
extern struct btrace_target_info *linux_enable_btrace (ptid_t ptid);
/* Disable branch tracing and deallocate @tinfo. */
extern int linux_disable_btrace (struct btrace_target_info *tinfo);
/* Read branch trace data. */
extern VEC (btrace_block_s) *linux_read_btrace (struct btrace_target_info *,
enum btrace_read_type);
#endif /* LINUX_BTRACE_H */
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