gdb/gdbarch.c

   1 /* Semi-dynamic architecture support for GDB, the GNU debugger.
   2    Copyright 1998, Free Software Foundation, Inc.
   3
   4 This file is part of GDB.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 #include "defs.h"
  21 #include "bfd.h"
  22 #include "gdbcmd.h"
  23
  24
  25
  26 /* Non-zero if we want to trace architecture code.  */
  27
  28 #ifndef GDBARCH_DEBUG
  29 #define GDBARCH_DEBUG 0
  30 #endif
  31 int gdbarch_debug = GDBARCH_DEBUG;
  32
  33
  34 /* Functions to manipulate the endianness of the target.  */
  35
  36 #ifdef TARGET_BYTE_ORDER_SELECTABLE
  37 /* compat - Catch old targets that expect a selectable byte-order to
  38    default to BIG_ENDIAN */
  39 #ifndef TARGET_BYTE_ORDER_DEFAULT
  40 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN
  41 #endif
  42 #endif
  43 #ifndef TARGET_BYTE_ORDER_DEFAULT
  44 /* compat - Catch old non byte-order selectable targets that do not
  45    define TARGET_BYTE_ORDER_DEFAULT and instead expect
  46    TARGET_BYTE_ORDER to be used as the default.  For targets that
  47    defined neither TARGET_BYTE_ORDER nor TARGET_BYTE_ORDER_DEFAULT the
  48    below will get a strange compiler warning. */
  49 #define TARGET_BYTE_ORDER_DEFAULT TARGET_BYTE_ORDER
  50 #endif
  51 int target_byte_order = TARGET_BYTE_ORDER_DEFAULT;
  52 int target_byte_order_auto = 1;
  53
  54 /* Chain containing the \"set endian\" commands.  */
  55 static struct cmd_list_element *endianlist = NULL;
  56
  57 /* Called by ``show endian''.  */
  58 static void show_endian PARAMS ((char *, int));
  59 static void
  60 show_endian (args, from_tty)
  61      char *args;
  62      int from_tty;
  63 {
  64   char *msg =
  65     (TARGET_BYTE_ORDER_AUTO
  66      ? "The target endianness is set automatically (currently %s endian)\n"
  67      : "The target is assumed to be %s endian\n");
  68   printf_unfiltered (msg, (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
  69 }
  70
  71 /* Called if the user enters ``set endian'' without an argument.  */
  72 static void set_endian PARAMS ((char *, int));
  73 static void
  74 set_endian (args, from_tty)
  75      char *args;
  76      int from_tty;
  77 {
  78   printf_unfiltered ("\"set endian\" must be followed by \"auto\", \"big\" or \"little\".\n");
  79   show_endian (args, from_tty);
  80 }
  81
  82 /* Called by ``set endian big''.  */
  83 static void set_endian_big PARAMS ((char *, int));
  84 static void
  85 set_endian_big (args, from_tty)
  86      char *args;
  87      int from_tty;
  88 {
  89   if (TARGET_BYTE_ORDER_SELECTABLE_P)
  90     {
  91       target_byte_order = BIG_ENDIAN;
  92       target_byte_order_auto = 0;
  93     }
  94   else
  95     {
  96       printf_unfiltered ("Byte order is not selectable.");
  97       show_endian (args, from_tty);
  98     }
  99 }
 100
 101 /* Called by ``set endian little''.  */
 102 static void set_endian_little PARAMS ((char *, int));
 103 static void
 104 set_endian_little (args, from_tty)
 105      char *args;
 106      int from_tty;
 107 {
 108   if (TARGET_BYTE_ORDER_SELECTABLE_P)
 109     {
 110       target_byte_order = LITTLE_ENDIAN;
 111       target_byte_order_auto = 0;
 112     }
 113   else
 114     {
 115       printf_unfiltered ("Byte order is not selectable.");
 116       show_endian (args, from_tty);
 117     }
 118 }
 119
 120 /* Called by ``set endian auto''.  */
 121 static void set_endian_auto PARAMS ((char *, int));
 122 static void
 123 set_endian_auto (args, from_tty)
 124      char *args;
 125      int from_tty;
 126 {
 127   if (TARGET_BYTE_ORDER_SELECTABLE_P)
 128     {
 129       target_byte_order_auto = 1;
 130     }
 131   else
 132     {
 133       printf_unfiltered ("Byte order is not selectable.");
 134       show_endian (args, from_tty);
 135     }
 136 }
 137
 138 /* Set the endianness from a BFD.  */
 139 static void set_endian_from_file PARAMS ((bfd *));
 140 static void
 141 set_endian_from_file (abfd)
 142      bfd *abfd;
 143 {
 144   if (TARGET_BYTE_ORDER_SELECTABLE_P)
 145     {
 146       int want;
 147
 148       if (bfd_big_endian (abfd))
 149         want = BIG_ENDIAN;
 150       else
 151         want = LITTLE_ENDIAN;
 152       if (TARGET_BYTE_ORDER_AUTO)
 153         target_byte_order = want;
 154       else if (TARGET_BYTE_ORDER != want)
 155         warning ("%s endian file does not match %s endian target.",
 156                  want == BIG_ENDIAN ? "big" : "little",
 157                  TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
 158     }
 159   else
 160     {
 161       if (bfd_big_endian (abfd)
 162           ? TARGET_BYTE_ORDER != BIG_ENDIAN
 163           : TARGET_BYTE_ORDER == BIG_ENDIAN)
 164         warning ("%s endian file does not match %s endian target.",
 165                  bfd_big_endian (abfd) ? "big" : "little",
 166                  TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
 167     }
 168 }
 169
 170
 171
 172 /* Functions to manipulate the architecture of the target */
 173
 174 int target_architecture_auto = 1;
 175 extern const struct bfd_arch_info bfd_default_arch_struct;
 176 const struct bfd_arch_info *target_architecture = &bfd_default_arch_struct;
 177 int (*target_architecture_hook) PARAMS ((const struct bfd_arch_info *ap));
 178
 179 /* Do the real work of changing the current architecture */
 180 static void
 181 set_arch (arch)
 182      const struct bfd_arch_info *arch;
 183 {
 184   /* FIXME: Is it compatible with gdb? */
 185   /* Check with the target on the setting */
 186   if (target_architecture_hook != NULL
 187       && !target_architecture_hook (arch))
 188     printf_unfiltered ("Target does not support `%s' architecture.\n",
 189                        arch->printable_name);
 190   else
 191     {
 192       target_architecture_auto = 0;
 193       target_architecture = arch;
 194     }
 195 }
 196
 197 /* Called if the user enters ``show architecture'' without an argument. */
 198 static void show_architecture PARAMS ((char *, int));
 199 static void
 200 show_architecture (args, from_tty)
 201      char *args;
 202      int from_tty;
 203 {
 204   const char *arch;
 205   arch = TARGET_ARCHITECTURE->printable_name;
 206   if (target_architecture_auto)
 207     printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
 208   else
 209     printf_filtered ("The target architecture is assumed to be %s\n", arch);
 210 }
 211
 212 /* Called if the user enters ``set architecture'' with or without an
 213    argument. */
 214 static void set_architecture PARAMS ((char *, int));
 215 static void
 216 set_architecture (args, from_tty)
 217      char *args;
 218      int from_tty;
 219 {
 220   if (args == NULL)
 221     {
 222       printf_unfiltered ("\"set architecture\" must be followed by \"auto\" or an architecture name.\n");
 223     }
 224   else if (strcmp (args, "auto") == 0)
 225     {
 226       target_architecture_auto = 1;
 227     }
 228   else
 229     {
 230       const struct bfd_arch_info *arch = bfd_scan_arch (args);
 231       if (arch != NULL)
 232         set_arch (arch);
 233       else
 234         printf_unfiltered ("Architecture `%s' not reconized.\n", args);
 235     }
 236 }
 237
 238 /* Called if the user enters ``info architecture'' without an argument. */
 239 static void info_architecture PARAMS ((char *, int));
 240 static void
 241 info_architecture (args, from_tty)
 242      char *args;
 243      int from_tty;
 244 {
 245   enum bfd_architecture a;
 246   printf_filtered ("Available architectures are:\n");
 247   for (a = bfd_arch_obscure + 1; a < bfd_arch_last; a++)
 248     {
 249       const struct bfd_arch_info *ap = bfd_lookup_arch (a, 0);
 250       if (ap != NULL)
 251         {
 252           do
 253             {
 254               printf_filtered (" %s", ap->printable_name);
 255               ap = ap->next;
 256             }
 257           while (ap != NULL);
 258           printf_filtered ("\n");
 259         }
 260     }
 261 }
 262
 263 /* Set the architecture from arch/machine */
 264 void
 265 set_architecture_from_arch_mach (arch, mach)
 266      enum bfd_architecture arch;
 267      unsigned long mach;
 268 {
 269   const struct bfd_arch_info *wanted = bfd_lookup_arch (arch, mach);
 270   if (wanted != NULL)
 271     set_arch (wanted);
 272   else
 273     fatal ("hardwired architecture/machine not reconized");
 274 }
 275
 276 /* Set the architecture from a BFD */
 277 static void set_architecture_from_file PARAMS ((bfd *));
 278 static void
 279 set_architecture_from_file (abfd)
 280      bfd *abfd;
 281 {
 282   const struct bfd_arch_info *wanted = bfd_get_arch_info (abfd);
 283   if (target_architecture_auto)
 284     {
 285       if (target_architecture_hook != NULL
 286           && !target_architecture_hook (wanted))
 287         warning ("Target may not support %s architecture",
 288                  wanted->printable_name);
 289       target_architecture = wanted;
 290     }
 291   else if (wanted != target_architecture)
 292     {
 293       warning ("%s architecture file may be incompatible with %s target.",
 294                wanted->printable_name,
 295                target_architecture->printable_name);
 296     }
 297 }
 298
 299
 300
 301 /* Disassembler */
 302
 303 /* Pointer to the target-dependent disassembly function.  */
 304 int (*tm_print_insn) PARAMS ((bfd_vma, disassemble_info *));
 305 disassemble_info tm_print_insn_info;
 306
 307
 308
 309 /* Set the dynamic target-system-dependant parameters (architecture,
 310    byte-order) using information found in the BFD */
 311
 312 void
 313 set_gdbarch_from_file (abfd)
 314      bfd *abfd;
 315 {
 316   set_architecture_from_file (abfd);
 317   set_endian_from_file (abfd);
 318 }
 319
 320
 321 extern void _initialize_gdbarch PARAMS ((void));
 322 void
 323 _initialize_gdbarch ()
 324 {
 325   add_prefix_cmd ("endian", class_support, set_endian,
 326                   "Set endianness of target.",
 327                   &endianlist, "set endian ", 0, &setlist);
 328   add_cmd ("big", class_support, set_endian_big,
 329            "Set target as being big endian.", &endianlist);
 330   add_cmd ("little", class_support, set_endian_little,
 331            "Set target as being little endian.", &endianlist);
 332   add_cmd ("auto", class_support, set_endian_auto,
 333            "Select target endianness automatically.", &endianlist);
 334   add_cmd ("endian", class_support, show_endian,
 335            "Show endianness of target.", &showlist);
 336
 337   add_cmd ("architecture", class_support, set_architecture,
 338            "Set architecture of target.", &setlist);
 339   add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
 340   add_cmd ("architecture", class_support, show_architecture,
 341            "Show architecture of target.", &showlist);
 342   add_cmd ("architecture", class_support, info_architecture,
 343            "List supported target architectures", &infolist);
 344
 345   INIT_DISASSEMBLE_INFO_NO_ARCH (tm_print_insn_info, gdb_stdout, (fprintf_ftype)fprintf_filtered);
 346   tm_print_insn_info.flavour = bfd_target_unknown_flavour;
 347   tm_print_insn_info.read_memory_func = dis_asm_read_memory;
 348   tm_print_insn_info.memory_error_func = dis_asm_memory_error;
 349   tm_print_insn_info.print_address_func = dis_asm_print_address;
 350
 351 #ifdef MAINTENANCE_CMDS
 352   add_show_from_set (add_set_cmd ("archdebug",
 353                                   class_maintenance,
 354                                   var_zinteger,
 355                                   (char *)&gdbarch_debug,
 356                                   "Set architecture debugging.\n\
 357 When non-zero, architecture debugging is enabled.", &setlist),
 358                      &showlist);
 359 #endif
 360 }