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/* Linux-dependent part of branch trace support for GDB, and GDBserver.
Copyright (C) 2013-2015 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 "vec.h"
#if HAVE_LINUX_PERF_EVENT_H
# include <linux/perf_event.h>
#endif
struct target_ops;
#if HAVE_LINUX_PERF_EVENT_H
/* A Linux perf event buffer. */
struct perf_event_buffer
{
/* The mapped memory. */
const uint8_t *mem;
/* The size of the mapped memory in bytes. */
size_t size;
/* A pointer to the data_head field for this buffer. */
volatile __u64 *data_head;
/* The data_head value from the last read. */
__u64 last_head;
};
/* Branch trace target information for BTS tracing. */
struct btrace_tinfo_bts
{
/* The Linux perf_event configuration for collecting the branch trace. */
struct perf_event_attr attr;
/* The perf event file. */
int file;
/* The perf event configuration page. */
volatile struct perf_event_mmap_page *header;
/* The BTS perf event buffer. */
struct perf_event_buffer bts;
};
/* Branch trace target information for Intel(R) Processor Trace. */
struct btrace_tinfo_pt
{
/* The Linux perf_event configuration for collecting the branch trace. */
struct perf_event_attr attr;
/* The perf event file. */
int file;
/* The perf event configuration page. */
volatile struct perf_event_mmap_page *header;
/* The trace perf event buffer. */
struct perf_event_buffer pt;
};
#endif /* HAVE_LINUX_PERF_EVENT_H */
/* Branch trace target information per thread. */
struct btrace_target_info
{
/* The ptid of this thread. */
ptid_t ptid;
/* The obtained branch trace configuration. */
struct btrace_config conf;
#if HAVE_LINUX_PERF_EVENT_H
/* The branch tracing format specific information. */
union
{
/* CONF.FORMAT == BTRACE_FORMAT_BTS. */
struct btrace_tinfo_bts bts;
/* CONF.FORMAT == BTRACE_FORMAT_PT. */
struct btrace_tinfo_pt pt;
} variant;
#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;
};
/* See to_supports_btrace in target.h. */
extern int linux_supports_btrace (struct target_ops *, enum btrace_format);
/* See to_enable_btrace in target.h. */
extern struct btrace_target_info *
linux_enable_btrace (ptid_t ptid, const struct btrace_config *conf);
/* See to_disable_btrace in target.h. */
extern enum btrace_error linux_disable_btrace (struct btrace_target_info *ti);
/* See to_read_btrace in target.h. */
extern enum btrace_error linux_read_btrace (struct btrace_data *btrace,
struct btrace_target_info *btinfo,
enum btrace_read_type type);
/* See to_btrace_conf in target.h. */
extern const struct btrace_config *
linux_btrace_conf (const struct btrace_target_info *);
#endif /* LINUX_BTRACE_H */
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