gdb/gdbserver/tdesc.c

   1 /* Copyright (C) 2012-2018 Free Software Foundation, Inc.
   2
   3    This file is part of GDB.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #include "server.h"
  19 #include "tdesc.h"
  20 #include "regdef.h"
  21
  22 #ifndef IN_PROCESS_AGENT
  23
  24 target_desc::~target_desc ()
  25 {
  26   int i;
  27
  28   xfree ((char *) arch);
  29   xfree ((char *) osabi);
  30 }
  31
  32 bool target_desc::operator== (const target_desc &other) const
  33 {
  34   if (reg_defs != other.reg_defs)
  35     return false;
  36
  37   /* Compare expedite_regs.  */
  38   int i = 0;
  39   for (; expedite_regs[i] != NULL; i++)
  40     {
  41       if (strcmp (expedite_regs[i], other.expedite_regs[i]) != 0)
  42         return false;
  43     }
  44   if (other.expedite_regs[i] != NULL)
  45     return false;
  46
  47   return true;
  48 }
  49
  50 #endif
  51
  52 void
  53 init_target_desc (struct target_desc *tdesc)
  54 {
  55   int offset = 0;
  56
  57   /* Go through all the features and populate reg_defs.  */
  58   for (const tdesc_reg_up &treg : tdesc->registers)
  59     {
  60       int regnum = treg->target_regnum;
  61
  62       /* Register number will increase (possibly with gaps) or be zero.  */
  63       gdb_assert (regnum == 0 || regnum >= tdesc->reg_defs.size ());
  64
  65       if (regnum != 0)
  66         tdesc->reg_defs.resize (regnum, reg (offset));
  67
  68       tdesc->reg_defs.emplace_back (treg->name.c_str (), offset, treg->bitsize);
  69       offset += treg->bitsize;
  70     }
  71
  72   tdesc->registers_size = offset / 8;
  73
  74   /* Make sure PBUFSIZ is large enough to hold a full register
  75      packet.  */
  76   gdb_assert (2 * tdesc->registers_size + 32 <= PBUFSIZ);
  77 }
  78
  79 struct target_desc *
  80 allocate_target_description (void)
  81 {
  82   return new target_desc ();
  83 }
  84
  85 #ifndef IN_PROCESS_AGENT
  86
  87 static const struct target_desc default_description {};
  88
  89 void
  90 copy_target_description (struct target_desc *dest,
  91                          const struct target_desc *src)
  92 {
  93   dest->reg_defs = src->reg_defs;
  94   dest->expedite_regs = src->expedite_regs;
  95   dest->registers_size = src->registers_size;
  96   dest->xmltarget = src->xmltarget;
  97 }
  98
  99 const struct target_desc *
 100 current_target_desc (void)
 101 {
 102   if (current_thread == NULL)
 103     return &default_description;
 104
 105   return current_process ()->tdesc;
 106 }
 107
 108 /* See common/tdesc.h.  */
 109
 110 void
 111 set_tdesc_architecture (struct target_desc *target_desc,
 112                         const char *name)
 113 {
 114   target_desc->arch = xstrdup (name);
 115 }
 116
 117 /* See common/tdesc.h.  */
 118
 119 void
 120 set_tdesc_osabi (struct target_desc *target_desc, const char *name)
 121 {
 122   target_desc->osabi = xstrdup (name);
 123 }
 124
 125 /* Return a string which is of XML format, including XML target
 126    description to be sent to GDB.  */
 127
 128 const char *
 129 tdesc_get_features_xml (target_desc *tdesc)
 130 {
 131   /* Either .xmltarget or .features is not NULL.  */
 132   gdb_assert (tdesc->xmltarget != NULL
 133               || (!tdesc->features.empty ()
 134                   && tdesc->arch != NULL));
 135
 136   if (tdesc->xmltarget == NULL)
 137     {
 138       std::string buffer ("@<?xml version=\"1.0\"?>");
 139
 140       buffer += "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">";
 141       buffer += "<target>";
 142       buffer += "<architecture>";
 143       buffer += tdesc->arch;
 144       buffer += "</architecture>";
 145
 146       if (tdesc->osabi != nullptr)
 147         {
 148           buffer += "<osabi>";
 149           buffer += tdesc->osabi;
 150           buffer += "</osabi>";
 151         }
 152
 153
 154       for (const std::string &xml : tdesc->features)
 155         {
 156           buffer += "<xi:include href=\"";
 157           buffer += xml;
 158           buffer += "\"/>";
 159         }
 160
 161       buffer += "</target>";
 162
 163       tdesc->xmltarget = xstrdup (buffer.c_str ());
 164     }
 165
 166   return tdesc->xmltarget;
 167 }
 168 #endif
 169
 170 struct tdesc_type
 171 {};
 172
 173 /* See common/tdesc.h.  */
 174
 175 struct tdesc_feature *
 176 tdesc_create_feature (struct target_desc *tdesc, const char *name,
 177                       const char *xml)
 178 {
 179 #ifndef IN_PROCESS_AGENT
 180   tdesc->features.emplace_back (xml);
 181 #endif
 182   return tdesc;
 183 }
 184
 185 /* See common/tdesc.h.  */
 186
 187 tdesc_type_with_fields *
 188 tdesc_create_flags (struct tdesc_feature *feature, const char *name,
 189                     int size)
 190 {
 191   return NULL;
 192 }
 193
 194 /* See common/tdesc.h.  */
 195
 196 void
 197 tdesc_add_flag (tdesc_type_with_fields *type, int start,
 198                 const char *flag_name)
 199 {}
 200
 201 /* See common/tdesc.h.  */
 202
 203 struct tdesc_type *
 204 tdesc_named_type (const struct tdesc_feature *feature, const char *id)
 205 {
 206   return NULL;
 207 }
 208
 209 /* See common/tdesc.h.  */
 210
 211 tdesc_type_with_fields *
 212 tdesc_create_union (struct tdesc_feature *feature, const char *id)
 213 {
 214   return NULL;
 215 }
 216
 217 /* See common/tdesc.h.  */
 218
 219 tdesc_type_with_fields *
 220 tdesc_create_struct (struct tdesc_feature *feature, const char *id)
 221 {
 222   return NULL;
 223 }
 224
 225 /* See common/tdesc.h.  */
 226
 227 void
 228 tdesc_create_reg (struct tdesc_feature *feature, const char *name,
 229                   int regnum, int save_restore, const char *group,
 230                   int bitsize, const char *type)
 231 {
 232   struct target_desc *tdesc = (struct target_desc *) feature;
 233
 234   tdesc_reg *reg = new tdesc_reg (feature, name, regnum, save_restore,
 235                                   group, bitsize, type);
 236
 237   tdesc->registers.emplace_back (reg);
 238 }
 239
 240 /* See common/tdesc.h.  */
 241
 242 struct tdesc_type *
 243 tdesc_create_vector (struct tdesc_feature *feature, const char *name,
 244                      struct tdesc_type *field_type, int count)
 245 {
 246   return NULL;
 247 }
 248
 249 void
 250 tdesc_add_bitfield (tdesc_type_with_fields *type, const char *field_name,
 251                     int start, int end)
 252 {}
 253
 254 /* See common/tdesc.h.  */
 255
 256 void
 257 tdesc_add_field (tdesc_type_with_fields *type, const char *field_name,
 258                  struct tdesc_type *field_type)
 259 {}
 260
 261 /* See common/tdesc.h.  */
 262
 263 void
 264 tdesc_set_struct_size (tdesc_type_with_fields *type, int size)
 265 {
 266 }