gdb/nat/linux-btrace.h

   1 /* Linux-dependent part of branch trace support for GDB, and GDBserver.
   2
   3    Copyright (C) 2013-2014 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 "ptid.h"
  28 #include <stdint.h>
  29
  30 #if HAVE_LINUX_PERF_EVENT_H
  31 #  include <linux/perf_event.h>
  32 #endif
  33
  34 /* Branch trace target information per thread.  */
  35 struct btrace_target_info
  36 {
  37 #if HAVE_LINUX_PERF_EVENT_H
  38   /* The Linux perf_event configuration for collecting the branch trace.  */
  39   struct perf_event_attr attr;
  40
  41   /* The ptid of this thread.  */
  42   ptid_t ptid;
  43
  44   /* The mmap configuration mapping the branch trace perf_event buffer.
  45
  46      file      .. the file descriptor
  47      buffer    .. the mmapped memory buffer
  48      size      .. the buffer's size in pages without the configuration page
  49      data_head .. the data head from the last read  */
  50   int file;
  51   void *buffer;
  52   size_t size;
  53   unsigned long data_head;
  54 #endif /* HAVE_LINUX_PERF_EVENT_H */
  55
  56   /* The size of a pointer in bits for this thread.
  57      The information is used to identify kernel addresses in order to skip
  58      records from/to kernel space.  */
  59   int ptr_bits;
  60 };
  61
  62 /* See to_supports_btrace in target.h.  */
  63 extern int linux_supports_btrace (struct target_ops *);
  64
  65 /* See to_enable_btrace in target.h.  */
  66 extern struct btrace_target_info *linux_enable_btrace (ptid_t ptid);
  67
  68 /* See to_disable_btrace in target.h.  */
  69 extern enum btrace_error linux_disable_btrace (struct btrace_target_info *ti);
  70
  71 /* See to_read_btrace in target.h.  */
  72 extern enum btrace_error linux_read_btrace (VEC (btrace_block_s) **btrace,
  73                                             struct btrace_target_info *btinfo,
  74                                             enum btrace_read_type type);
  75
  76 #endif /* LINUX_BTRACE_H */