gdb/common/btrace-common.h

   1 /* Branch trace support for GDB, the GNU debugger.
   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 BTRACE_COMMON_H
  23 #define BTRACE_COMMON_H
  24
  25 /* Branch tracing (btrace) is a per-thread control-flow execution trace of the
  26    inferior.  For presentation purposes, the branch trace is represented as a
  27    list of sequential control-flow blocks, one such list per thread.  */
  28
  29 #include "vec.h"
  30
  31 /* A branch trace block.
  32
  33    This represents a block of sequential control-flow.  Adjacent blocks will be
  34    connected via calls, returns, or jumps.  The latter can be direct or
  35    indirect, conditional or unconditional.  Branches can further be
  36    asynchronous, e.g. interrupts.  */
  37 struct btrace_block
  38 {
  39   /* The address of the first byte of the first instruction in the block.
  40      The address may be zero if we do not know the beginning of this block,
  41      such as for the first block in a delta trace.  */
  42   CORE_ADDR begin;
  43
  44   /* The address of the first byte of the last instruction in the block.  */
  45   CORE_ADDR end;
  46 };
  47
  48 /* Define functions operating on a vector of branch trace blocks.  */
  49 typedef struct btrace_block btrace_block_s;
  50 DEF_VEC_O (btrace_block_s);
  51
  52 /* Enumeration of btrace formats.  */
  53
  54 enum btrace_format
  55 {
  56   /* No branch trace format.  */
  57   BTRACE_FORMAT_NONE,
  58
  59   /* Branch trace is in Branch Trace Store (BTS) format.
  60      Actually, the format is a sequence of blocks derived from BTS.  */
  61   BTRACE_FORMAT_BTS,
  62
  63   /* Branch trace is in Intel(R) Processor Trace format.  */
  64   BTRACE_FORMAT_PT
  65 };
  66
  67 /* An enumeration of cpu vendors.  */
  68
  69 enum btrace_cpu_vendor
  70 {
  71   /* We do not know this vendor.  */
  72   CV_UNKNOWN,
  73
  74   /* Intel.  */
  75   CV_INTEL
  76 };
  77
  78 /* A cpu identifier.  */
  79
  80 struct btrace_cpu
  81 {
  82   /* The processor vendor.  */
  83   enum btrace_cpu_vendor vendor;
  84
  85   /* The cpu family.  */
  86   unsigned short family;
  87
  88   /* The cpu model.  */
  89   unsigned char model;
  90
  91   /* The cpu stepping.  */
  92   unsigned char stepping;
  93 };
  94
  95 /* A BTS configuration.  */
  96
  97 struct btrace_config_bts
  98 {
  99   /* The size of the branch trace buffer in bytes.  */
 100   unsigned int size;
 101 };
 102
 103 /* An Intel(R) Processor Trace configuration.  */
 104
 105 struct btrace_config_pt
 106 {
 107   /* The size of the branch trace buffer in bytes.  */
 108   unsigned int size;
 109 };
 110
 111 /* A branch tracing configuration.
 112
 113    This describes the requested configuration as well as the actually
 114    obtained configuration.
 115    We describe the configuration for all different formats so we can
 116    easily switch between formats.  */
 117
 118 struct btrace_config
 119 {
 120   /* The branch tracing format.  */
 121   enum btrace_format format;
 122
 123   /* The BTS format configuration.  */
 124   struct btrace_config_bts bts;
 125
 126   /* The Intel(R) Processor Trace format configuration.  */
 127   struct btrace_config_pt pt;
 128 };
 129
 130 /* Branch trace in BTS format.  */
 131 struct btrace_data_bts
 132 {
 133   /* Branch trace is represented as a vector of branch trace blocks starting
 134      with the most recent block.  */
 135   VEC (btrace_block_s) *blocks;
 136 };
 137
 138 /* Configuration information to go with the trace data.  */
 139 struct btrace_data_pt_config
 140 {
 141   /* The processor on which the trace has been collected.  */
 142   struct btrace_cpu cpu;
 143 };
 144
 145 /* Branch trace in Intel(R) Processor Trace format.  */
 146 struct btrace_data_pt
 147 {
 148   /* Some configuration information to go with the data.  */
 149   struct btrace_data_pt_config config;
 150
 151   /* The trace data.  */
 152   gdb_byte *data;
 153
 154   /* The size of DATA in bytes.  */
 155   unsigned long size;
 156 };
 157
 158 /* The branch trace data.  */
 159 struct btrace_data
 160 {
 161   enum btrace_format format;
 162
 163   union
 164   {
 165     /* Format == BTRACE_FORMAT_BTS.  */
 166     struct btrace_data_bts bts;
 167
 168     /* Format == BTRACE_FORMAT_PT.  */
 169     struct btrace_data_pt pt;
 170   } variant;
 171 };
 172
 173 /* Target specific branch trace information.  */
 174 struct btrace_target_info;
 175
 176 /* Enumeration of btrace read types.  */
 177
 178 enum btrace_read_type
 179 {
 180   /* Send all available trace.  */
 181   BTRACE_READ_ALL,
 182
 183   /* Send all available trace, if it changed.  */
 184   BTRACE_READ_NEW,
 185
 186   /* Send the trace since the last request.  This will fail if the trace
 187      buffer overflowed.  */
 188   BTRACE_READ_DELTA
 189 };
 190
 191 /* Enumeration of btrace errors.  */
 192
 193 enum btrace_error
 194 {
 195   /* No error.  Everything is OK.  */
 196   BTRACE_ERR_NONE,
 197
 198   /* An unknown error.  */
 199   BTRACE_ERR_UNKNOWN,
 200
 201   /* Branch tracing is not supported on this system.  */
 202   BTRACE_ERR_NOT_SUPPORTED,
 203
 204   /* The branch trace buffer overflowed; no delta read possible.  */
 205   BTRACE_ERR_OVERFLOW
 206 };
 207
 208 /* Return a string representation of FORMAT.  */
 209 extern const char *btrace_format_string (enum btrace_format format);
 210
 211 /* Initialize DATA.  */
 212 extern void btrace_data_init (struct btrace_data *data);
 213
 214 /* Cleanup DATA.  */
 215 extern void btrace_data_fini (struct btrace_data *data);
 216
 217 /* Return non-zero if DATA is empty; zero otherwise.  */
 218 extern int btrace_data_empty (struct btrace_data *data);
 219
 220 #endif /* BTRACE_COMMON_H */