gdb/nat/linux-btrace.h

   1 /* Linux-dependent part of branch trace support for GDB, and GDBserver.
   2
   3    Copyright (C) 2013-2015 Free Software Foundation, Inc.
   4
   5    Contributed by Intel Corp. <markus.t.metzger@intel.com>
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22 #ifndef LINUX_BTRACE_H
  23 #define LINUX_BTRACE_H
  24
  25 #include "btrace-common.h"
  26 #include "vec.h"
  27 #include <stdint.h>
  28
  29 #if HAVE_LINUX_PERF_EVENT_H
  30 #  include <linux/perf_event.h>
  31 #endif
  32
  33 struct target_ops;
  34
  35 #if HAVE_LINUX_PERF_EVENT_H
  36 /* A Linux perf event buffer.  */
  37 struct perf_event_buffer
  38 {
  39   /* The mapped memory.  */
  40   const uint8_t *mem;
  41
  42   /* The size of the mapped memory in bytes.  */
  43   unsigned long long size;
  44
  45   /* A pointer to the data_head field for this buffer. */
  46   volatile unsigned long long *data_head;
  47
  48   /* The data_head value from the last read.  */
  49   unsigned long long last_head;
  50 };
  51 #endif /* HAVE_LINUX_PERF_EVENT_H */
  52
  53 /* Branch trace target information per thread.  */
  54 struct btrace_target_info
  55 {
  56 #if HAVE_LINUX_PERF_EVENT_H
  57   /* The Linux perf_event configuration for collecting the branch trace.  */
  58   struct perf_event_attr attr;
  59
  60   /* The ptid of this thread.  */
  61   ptid_t ptid;
  62
  63   /* The perf event file.  */
  64   int file;
  65
  66   /* The perf event configuration page. */
  67   volatile struct perf_event_mmap_page *header;
  68
  69   /* The BTS perf event buffer.  */
  70   struct perf_event_buffer bts;
  71 #endif /* HAVE_LINUX_PERF_EVENT_H */
  72
  73   /* The size of a pointer in bits for this thread.
  74      The information is used to identify kernel addresses in order to skip
  75      records from/to kernel space.  */
  76   int ptr_bits;
  77 };
  78
  79 /* See to_supports_btrace in target.h.  */
  80 extern int linux_supports_btrace (struct target_ops *, enum btrace_format);
  81
  82 /* See to_enable_btrace in target.h.  */
  83 extern struct btrace_target_info *linux_enable_btrace (ptid_t ptid);
  84
  85 /* See to_disable_btrace in target.h.  */
  86 extern enum btrace_error linux_disable_btrace (struct btrace_target_info *ti);
  87
  88 /* See to_read_btrace in target.h.  */
  89 extern enum btrace_error linux_read_btrace (struct btrace_data *btrace,
  90                                             struct btrace_target_info *btinfo,
  91                                             enum btrace_read_type type);
  92
  93 #endif /* LINUX_BTRACE_H */