gdb/arch-utils.c

   1 /* Dynamic architecture support for GDB, the GNU debugger.
   2
   3    Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  21    Boston, MA 02110-1301, USA.  */
  22
  23 #include "defs.h"
  24
  25 #include "arch-utils.h"
  26 #include "buildsym.h"
  27 #include "gdbcmd.h"
  28 #include "inferior.h"           /* enum CALL_DUMMY_LOCATION et.al. */
  29 #include "gdb_string.h"
  30 #include "regcache.h"
  31 #include "gdb_assert.h"
  32 #include "sim-regno.h"
  33 #include "gdbcore.h"
  34 #include "osabi.h"
  35
  36 #include "version.h"
  37
  38 #include "floatformat.h"
  39
  40 /* Implementation of extract return value that grubs around in the
  41    register cache.  */
  42 void
  43 legacy_extract_return_value (struct type *type, struct regcache *regcache,
  44                              gdb_byte *valbuf)
  45 {
  46   gdb_byte *registers = deprecated_grub_regcache_for_registers (regcache);
  47   gdb_byte *buf = valbuf;
  48   DEPRECATED_EXTRACT_RETURN_VALUE (type, registers, buf); /* OK */
  49 }
  50
  51 /* Implementation of store return value that grubs the register cache.
  52    Takes a local copy of the buffer to avoid const problems.  */
  53 void
  54 legacy_store_return_value (struct type *type, struct regcache *regcache,
  55                            const gdb_byte *buf)
  56 {
  57   gdb_byte *b = alloca (TYPE_LENGTH (type));
  58   gdb_assert (regcache == current_regcache);
  59   memcpy (b, buf, TYPE_LENGTH (type));
  60   DEPRECATED_STORE_RETURN_VALUE (type, b);
  61 }
  62
  63 int
  64 always_use_struct_convention (int gcc_p, struct type *value_type)
  65 {
  66   return 1;
  67 }
  68
  69 enum return_value_convention
  70 legacy_return_value (struct gdbarch *gdbarch, struct type *valtype,
  71                      struct regcache *regcache, gdb_byte *readbuf,
  72                      const gdb_byte *writebuf)
  73 {
  74   /* NOTE: cagney/2004-06-13: The gcc_p parameter to
  75      USE_STRUCT_CONVENTION isn't used.  */
  76   int struct_return = ((TYPE_CODE (valtype) == TYPE_CODE_STRUCT
  77                         || TYPE_CODE (valtype) == TYPE_CODE_UNION
  78                         || TYPE_CODE (valtype) == TYPE_CODE_ARRAY)
  79                        && DEPRECATED_USE_STRUCT_CONVENTION (0, valtype));
  80
  81   if (writebuf != NULL)
  82     {
  83       gdb_assert (!struct_return);
  84       /* NOTE: cagney/2004-06-13: See stack.c:return_command.  Old
  85          architectures don't expect STORE_RETURN_VALUE to handle small
  86          structures.  Should not be called with such types.  */
  87       gdb_assert (TYPE_CODE (valtype) != TYPE_CODE_STRUCT
  88                   && TYPE_CODE (valtype) != TYPE_CODE_UNION);
  89       STORE_RETURN_VALUE (valtype, regcache, writebuf);
  90     }
  91
  92   if (readbuf != NULL)
  93     {
  94       gdb_assert (!struct_return);
  95       EXTRACT_RETURN_VALUE (valtype, regcache, readbuf);
  96     }
  97
  98   if (struct_return)
  99     return RETURN_VALUE_STRUCT_CONVENTION;
 100   else
 101     return RETURN_VALUE_REGISTER_CONVENTION;
 102 }
 103
 104 int
 105 legacy_register_sim_regno (int regnum)
 106 {
 107   /* Only makes sense to supply raw registers.  */
 108   gdb_assert (regnum >= 0 && regnum < NUM_REGS);
 109   /* NOTE: cagney/2002-05-13: The old code did it this way and it is
 110      suspected that some GDB/SIM combinations may rely on this
 111      behavour.  The default should be one2one_register_sim_regno
 112      (below).  */
 113   if (REGISTER_NAME (regnum) != NULL
 114       && REGISTER_NAME (regnum)[0] != '\0')
 115     return regnum;
 116   else
 117     return LEGACY_SIM_REGNO_IGNORE;
 118 }
 119
 120 CORE_ADDR
 121 generic_skip_trampoline_code (CORE_ADDR pc)
 122 {
 123   return 0;
 124 }
 125
 126 CORE_ADDR
 127 generic_skip_solib_resolver (struct gdbarch *gdbarch, CORE_ADDR pc)
 128 {
 129   return 0;
 130 }
 131
 132 int
 133 generic_in_solib_return_trampoline (CORE_ADDR pc, char *name)
 134 {
 135   return 0;
 136 }
 137
 138 int
 139 generic_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
 140 {
 141   return 0;
 142 }
 143
 144 void
 145 generic_remote_translate_xfer_address (struct gdbarch *gdbarch,
 146                                        struct regcache *regcache,
 147                                        CORE_ADDR gdb_addr, int gdb_len,
 148                                        CORE_ADDR * rem_addr, int *rem_len)
 149 {
 150   *rem_addr = gdb_addr;
 151   *rem_len = gdb_len;
 152 }
 153
 154 /* Helper functions for INNER_THAN */
 155
 156 int
 157 core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs)
 158 {
 159   return (lhs < rhs);
 160 }
 161
 162 int
 163 core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs)
 164 {
 165   return (lhs > rhs);
 166 }
 167
 168
 169 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
 170
 171 const struct floatformat *
 172 default_float_format (struct gdbarch *gdbarch)
 173 {
 174   int byte_order = gdbarch_byte_order (gdbarch);
 175   switch (byte_order)
 176     {
 177     case BFD_ENDIAN_BIG:
 178       return &floatformat_ieee_single_big;
 179     case BFD_ENDIAN_LITTLE:
 180       return &floatformat_ieee_single_little;
 181     default:
 182       internal_error (__FILE__, __LINE__,
 183                       _("default_float_format: bad byte order"));
 184     }
 185 }
 186
 187
 188 const struct floatformat *
 189 default_double_format (struct gdbarch *gdbarch)
 190 {
 191   int byte_order = gdbarch_byte_order (gdbarch);
 192   switch (byte_order)
 193     {
 194     case BFD_ENDIAN_BIG:
 195       return &floatformat_ieee_double_big;
 196     case BFD_ENDIAN_LITTLE:
 197       return &floatformat_ieee_double_little;
 198     default:
 199       internal_error (__FILE__, __LINE__,
 200                       _("default_double_format: bad byte order"));
 201     }
 202 }
 203
 204 /* Misc helper functions for targets. */
 205
 206 CORE_ADDR
 207 core_addr_identity (CORE_ADDR addr)
 208 {
 209   return addr;
 210 }
 211
 212 CORE_ADDR
 213 convert_from_func_ptr_addr_identity (struct gdbarch *gdbarch, CORE_ADDR addr,
 214                                      struct target_ops *targ)
 215 {
 216   return addr;
 217 }
 218
 219 int
 220 no_op_reg_to_regnum (int reg)
 221 {
 222   return reg;
 223 }
 224
 225 void
 226 default_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym)
 227 {
 228   return;
 229 }
 230
 231 void
 232 default_coff_make_msymbol_special (int val, struct minimal_symbol *msym)
 233 {
 234   return;
 235 }
 236
 237 int
 238 cannot_register_not (int regnum)
 239 {
 240   return 0;
 241 }
 242
 243 /* Legacy version of target_virtual_frame_pointer().  Assumes that
 244    there is an DEPRECATED_FP_REGNUM and that it is the same, cooked or
 245    raw.  */
 246
 247 void
 248 legacy_virtual_frame_pointer (CORE_ADDR pc,
 249                               int *frame_regnum,
 250                               LONGEST *frame_offset)
 251 {
 252   /* FIXME: cagney/2002-09-13: This code is used when identifying the
 253      frame pointer of the current PC.  It is assuming that a single
 254      register and an offset can determine this.  I think it should
 255      instead generate a byte code expression as that would work better
 256      with things like Dwarf2's CFI.  */
 257   if (DEPRECATED_FP_REGNUM >= 0 && DEPRECATED_FP_REGNUM < NUM_REGS)
 258     *frame_regnum = DEPRECATED_FP_REGNUM;
 259   else if (SP_REGNUM >= 0 && SP_REGNUM < NUM_REGS)
 260     *frame_regnum = SP_REGNUM;
 261   else
 262     /* Should this be an internal error?  I guess so, it is reflecting
 263        an architectural limitation in the current design.  */
 264     internal_error (__FILE__, __LINE__, _("No virtual frame pointer available"));
 265   *frame_offset = 0;
 266 }
 267
 268 /* Assume the world is sane, every register's virtual and real size
 269    is identical.  */
 270
 271 int
 272 generic_register_size (int regnum)
 273 {
 274   gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
 275   return TYPE_LENGTH (gdbarch_register_type (current_gdbarch, regnum));
 276 }
 277
 278 /* Assume all registers are adjacent.  */
 279
 280 int
 281 generic_register_byte (int regnum)
 282 {
 283   int byte;
 284   int i;
 285   gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
 286   byte = 0;
 287   for (i = 0; i < regnum; i++)
 288     {
 289       byte += generic_register_size (i);
 290     }
 291   return byte;
 292 }
 293
 294 \f
 295 int
 296 legacy_pc_in_sigtramp (CORE_ADDR pc, char *name)
 297 {
 298 #if defined (DEPRECATED_IN_SIGTRAMP)
 299   return DEPRECATED_IN_SIGTRAMP (pc, name);
 300 #else
 301   return name && strcmp ("_sigtramp", name) == 0;
 302 #endif
 303 }
 304
 305 int
 306 generic_convert_register_p (int regnum, struct type *type)
 307 {
 308   return 0;
 309 }
 310
 311 int
 312 default_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type)
 313 {
 314   if (DEPRECATED_REG_STRUCT_HAS_ADDR_P ()
 315       && DEPRECATED_REG_STRUCT_HAS_ADDR (processing_gcc_compilation, type))
 316     {
 317       CHECK_TYPEDEF (type);
 318
 319       return (TYPE_CODE (type) == TYPE_CODE_STRUCT
 320               || TYPE_CODE (type) == TYPE_CODE_UNION
 321               || TYPE_CODE (type) == TYPE_CODE_SET
 322               || TYPE_CODE (type) == TYPE_CODE_BITSTRING);
 323     }
 324
 325   return 0;
 326 }
 327
 328 int
 329 generic_instruction_nullified (struct gdbarch *gdbarch,
 330                                struct regcache *regcache)
 331 {
 332   return 0;
 333 }
 334
 335 \f
 336 /* Functions to manipulate the endianness of the target.  */
 337
 338 static int target_byte_order_user = BFD_ENDIAN_UNKNOWN;
 339
 340 static const char endian_big[] = "big";
 341 static const char endian_little[] = "little";
 342 static const char endian_auto[] = "auto";
 343 static const char *endian_enum[] =
 344 {
 345   endian_big,
 346   endian_little,
 347   endian_auto,
 348   NULL,
 349 };
 350 static const char *set_endian_string;
 351
 352 /* Called by ``show endian''.  */
 353
 354 static void
 355 show_endian (struct ui_file *file, int from_tty, struct cmd_list_element *c,
 356              const char *value)
 357 {
 358   if (target_byte_order_user != BFD_ENDIAN_UNKNOWN)
 359     if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
 360       fprintf_unfiltered (file, _("The target endianness is set automatically "
 361                                   "(currently big endian)\n"));
 362     else
 363       fprintf_unfiltered (file, _("The target endianness is set automatically "
 364                            "(currently little endian)\n"));
 365   else
 366     if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
 367       fprintf_unfiltered (file,
 368                           _("The target is assumed to be big endian\n"));
 369     else
 370       fprintf_unfiltered (file,
 371                           _("The target is assumed to be little endian\n"));
 372 }
 373
 374 static void
 375 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
 376 {
 377   struct gdbarch_info info;
 378
 379   gdbarch_info_init (&info);
 380
 381   if (set_endian_string == endian_auto)
 382     {
 383       target_byte_order_user = BFD_ENDIAN_UNKNOWN;
 384       if (! gdbarch_update_p (info))
 385         internal_error (__FILE__, __LINE__,
 386                         _("set_endian: architecture update failed"));
 387     }
 388   else if (set_endian_string == endian_little)
 389     {
 390       info.byte_order = BFD_ENDIAN_LITTLE;
 391       if (! gdbarch_update_p (info))
 392         printf_unfiltered (_("Little endian target not supported by GDB\n"));
 393       else
 394         target_byte_order_user = BFD_ENDIAN_LITTLE;
 395     }
 396   else if (set_endian_string == endian_big)
 397     {
 398       info.byte_order = BFD_ENDIAN_BIG;
 399       if (! gdbarch_update_p (info))
 400         printf_unfiltered (_("Big endian target not supported by GDB\n"));
 401       else
 402         target_byte_order_user = BFD_ENDIAN_BIG;
 403     }
 404   else
 405     internal_error (__FILE__, __LINE__,
 406                     _("set_endian: bad value"));
 407
 408   show_endian (gdb_stdout, from_tty, NULL, NULL);
 409 }
 410
 411 /* Functions to manipulate the architecture of the target */
 412
 413 enum set_arch { set_arch_auto, set_arch_manual };
 414
 415 static const struct bfd_arch_info *target_architecture_user;
 416
 417 static const char *set_architecture_string;
 418
 419 const char *
 420 selected_architecture_name (void)
 421 {
 422   if (target_architecture_user == NULL)
 423     return NULL;
 424   else
 425     return set_architecture_string;
 426 }
 427
 428 /* Called if the user enters ``show architecture'' without an
 429    argument. */
 430
 431 static void
 432 show_architecture (struct ui_file *file, int from_tty,
 433                    struct cmd_list_element *c, const char *value)
 434 {
 435   const char *arch;
 436   arch = TARGET_ARCHITECTURE->printable_name;
 437   if (target_architecture_user == NULL)
 438     fprintf_filtered (file, _("\
 439 The target architecture is set automatically (currently %s)\n"), arch);
 440   else
 441     fprintf_filtered (file, _("\
 442 The target architecture is assumed to be %s\n"), arch);
 443 }
 444
 445
 446 /* Called if the user enters ``set architecture'' with or without an
 447    argument. */
 448
 449 static void
 450 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
 451 {
 452   struct gdbarch_info info;
 453
 454   gdbarch_info_init (&info);
 455
 456   if (strcmp (set_architecture_string, "auto") == 0)
 457     {
 458       target_architecture_user = NULL;
 459       if (!gdbarch_update_p (info))
 460         internal_error (__FILE__, __LINE__,
 461                         _("could not select an architecture automatically"));
 462     }
 463   else
 464     {
 465       info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
 466       if (info.bfd_arch_info == NULL)
 467         internal_error (__FILE__, __LINE__,
 468                         _("set_architecture: bfd_scan_arch failed"));
 469       if (gdbarch_update_p (info))
 470         target_architecture_user = info.bfd_arch_info;
 471       else
 472         printf_unfiltered (_("Architecture `%s' not recognized.\n"),
 473                            set_architecture_string);
 474     }
 475   show_architecture (gdb_stdout, from_tty, NULL, NULL);
 476 }
 477
 478 /* Try to select a global architecture that matches "info".  Return
 479    non-zero if the attempt succeds.  */
 480 int
 481 gdbarch_update_p (struct gdbarch_info info)
 482 {
 483   struct gdbarch *new_gdbarch = gdbarch_find_by_info (info);
 484
 485   /* If there no architecture by that name, reject the request.  */
 486   if (new_gdbarch == NULL)
 487     {
 488       if (gdbarch_debug)
 489         fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 490                             "Architecture not found\n");
 491       return 0;
 492     }
 493
 494   /* If it is the same old architecture, accept the request (but don't
 495      swap anything).  */
 496   if (new_gdbarch == current_gdbarch)
 497     {
 498       if (gdbarch_debug)
 499         fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 500                             "Architecture 0x%08lx (%s) unchanged\n",
 501                             (long) new_gdbarch,
 502                             gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
 503       return 1;
 504     }
 505
 506   /* It's a new architecture, swap it in.  */
 507   if (gdbarch_debug)
 508     fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 509                         "New architecture 0x%08lx (%s) selected\n",
 510                         (long) new_gdbarch,
 511                         gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
 512   deprecated_current_gdbarch_select_hack (new_gdbarch);
 513
 514   return 1;
 515 }
 516
 517 /* Return the architecture for ABFD.  If no suitable architecture
 518    could be find, return NULL.  */
 519
 520 struct gdbarch *
 521 gdbarch_from_bfd (bfd *abfd)
 522 {
 523   struct gdbarch *old_gdbarch = current_gdbarch;
 524   struct gdbarch *new_gdbarch;
 525   struct gdbarch_info info;
 526
 527   /* If we call gdbarch_find_by_info without filling in info.abfd,
 528      then it will use the global exec_bfd.  That's fine if we don't
 529      have one of those either.  And that's the only time we should
 530      reach here with a NULL ABFD argument - when we are discarding
 531      the executable.  */
 532   gdb_assert (abfd != NULL || exec_bfd == NULL);
 533
 534   gdbarch_info_init (&info);
 535   info.abfd = abfd;
 536   return gdbarch_find_by_info (info);
 537 }
 538
 539 /* Set the dynamic target-system-dependent parameters (architecture,
 540    byte-order) using information found in the BFD */
 541
 542 void
 543 set_gdbarch_from_file (bfd *abfd)
 544 {
 545   struct gdbarch *gdbarch;
 546
 547   gdbarch = gdbarch_from_bfd (abfd);
 548   if (gdbarch == NULL)
 549     error (_("Architecture of file not recognized."));
 550   deprecated_current_gdbarch_select_hack (gdbarch);
 551 }
 552
 553 /* Initialize the current architecture.  Update the ``set
 554    architecture'' command so that it specifies a list of valid
 555    architectures.  */
 556
 557 #ifdef DEFAULT_BFD_ARCH
 558 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
 559 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
 560 #else
 561 static const bfd_arch_info_type *default_bfd_arch;
 562 #endif
 563
 564 #ifdef DEFAULT_BFD_VEC
 565 extern const bfd_target DEFAULT_BFD_VEC;
 566 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
 567 #else
 568 static const bfd_target *default_bfd_vec;
 569 #endif
 570
 571 static int default_byte_order = BFD_ENDIAN_UNKNOWN;
 572
 573 void
 574 initialize_current_architecture (void)
 575 {
 576   const char **arches = gdbarch_printable_names ();
 577
 578   /* determine a default architecture and byte order. */
 579   struct gdbarch_info info;
 580   gdbarch_info_init (&info);
 581
 582   /* Find a default architecture. */
 583   if (default_bfd_arch == NULL)
 584     {
 585       /* Choose the architecture by taking the first one
 586          alphabetically. */
 587       const char *chosen = arches[0];
 588       const char **arch;
 589       for (arch = arches; *arch != NULL; arch++)
 590         {
 591           if (strcmp (*arch, chosen) < 0)
 592             chosen = *arch;
 593         }
 594       if (chosen == NULL)
 595         internal_error (__FILE__, __LINE__,
 596                         _("initialize_current_architecture: No arch"));
 597       default_bfd_arch = bfd_scan_arch (chosen);
 598       if (default_bfd_arch == NULL)
 599         internal_error (__FILE__, __LINE__,
 600                         _("initialize_current_architecture: Arch not found"));
 601     }
 602
 603   info.bfd_arch_info = default_bfd_arch;
 604
 605   /* Take several guesses at a byte order.  */
 606   if (default_byte_order == BFD_ENDIAN_UNKNOWN
 607       && default_bfd_vec != NULL)
 608     {
 609       /* Extract BFD's default vector's byte order. */
 610       switch (default_bfd_vec->byteorder)
 611         {
 612         case BFD_ENDIAN_BIG:
 613           default_byte_order = BFD_ENDIAN_BIG;
 614           break;
 615         case BFD_ENDIAN_LITTLE:
 616           default_byte_order = BFD_ENDIAN_LITTLE;
 617           break;
 618         default:
 619           break;
 620         }
 621     }
 622   if (default_byte_order == BFD_ENDIAN_UNKNOWN)
 623     {
 624       /* look for ``*el-*'' in the target name. */
 625       const char *chp;
 626       chp = strchr (target_name, '-');
 627       if (chp != NULL
 628           && chp - 2 >= target_name
 629           && strncmp (chp - 2, "el", 2) == 0)
 630         default_byte_order = BFD_ENDIAN_LITTLE;
 631     }
 632   if (default_byte_order == BFD_ENDIAN_UNKNOWN)
 633     {
 634       /* Wire it to big-endian!!! */
 635       default_byte_order = BFD_ENDIAN_BIG;
 636     }
 637
 638   info.byte_order = default_byte_order;
 639
 640   if (! gdbarch_update_p (info))
 641     internal_error (__FILE__, __LINE__,
 642                     _("initialize_current_architecture: Selection of "
 643                       "initial architecture failed"));
 644
 645   /* Create the ``set architecture'' command appending ``auto'' to the
 646      list of architectures. */
 647   {
 648     struct cmd_list_element *c;
 649     /* Append ``auto''. */
 650     int nr;
 651     for (nr = 0; arches[nr] != NULL; nr++);
 652     arches = xrealloc (arches, sizeof (char*) * (nr + 2));
 653     arches[nr + 0] = "auto";
 654     arches[nr + 1] = NULL;
 655     add_setshow_enum_cmd ("architecture", class_support,
 656                           arches, &set_architecture_string, _("\
 657 Set architecture of target."), _("\
 658 Show architecture of target."), NULL,
 659                           set_architecture, show_architecture,
 660                           &setlist, &showlist);
 661     add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
 662   }
 663 }
 664
 665
 666 /* Initialize a gdbarch info to values that will be automatically
 667    overridden.  Note: Originally, this ``struct info'' was initialized
 668    using memset(0).  Unfortunately, that ran into problems, namely
 669    BFD_ENDIAN_BIG is zero.  An explicit initialization function that
 670    can explicitly set each field to a well defined value is used.  */
 671
 672 void
 673 gdbarch_info_init (struct gdbarch_info *info)
 674 {
 675   memset (info, 0, sizeof (struct gdbarch_info));
 676   info->byte_order = BFD_ENDIAN_UNKNOWN;
 677   info->osabi = GDB_OSABI_UNINITIALIZED;
 678 }
 679
 680 /* Similar to init, but this time fill in the blanks.  Information is
 681    obtained from the global "set ..." options and explicitly
 682    initialized INFO fields.  */
 683
 684 void
 685 gdbarch_info_fill (struct gdbarch_info *info)
 686 {
 687   /* Check for the current file.  */
 688   if (info->abfd == NULL)
 689     info->abfd = exec_bfd;
 690
 691   /* "(gdb) set architecture ...".  */
 692   if (info->bfd_arch_info == NULL
 693       && target_architecture_user)
 694     info->bfd_arch_info = target_architecture_user;
 695   if (info->bfd_arch_info == NULL
 696       && info->abfd != NULL
 697       && bfd_get_arch (info->abfd) != bfd_arch_unknown
 698       && bfd_get_arch (info->abfd) != bfd_arch_obscure)
 699     info->bfd_arch_info = bfd_get_arch_info (info->abfd);
 700   /* From the default.  */
 701   if (info->bfd_arch_info == NULL)
 702     info->bfd_arch_info = default_bfd_arch;
 703
 704   /* "(gdb) set byte-order ...".  */
 705   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 706       && target_byte_order_user != BFD_ENDIAN_UNKNOWN)
 707     info->byte_order = target_byte_order_user;
 708   /* From the INFO struct.  */
 709   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 710       && info->abfd != NULL)
 711     info->byte_order = (bfd_big_endian (info->abfd) ? BFD_ENDIAN_BIG
 712                         : bfd_little_endian (info->abfd) ? BFD_ENDIAN_LITTLE
 713                         : BFD_ENDIAN_UNKNOWN);
 714   /* From the default.  */
 715   if (info->byte_order == BFD_ENDIAN_UNKNOWN)
 716     info->byte_order = default_byte_order;
 717
 718   /* "(gdb) set osabi ...".  Handled by gdbarch_lookup_osabi.  */
 719   if (info->osabi == GDB_OSABI_UNINITIALIZED)
 720     info->osabi = gdbarch_lookup_osabi (info->abfd);
 721
 722   /* Must have at least filled in the architecture.  */
 723   gdb_assert (info->bfd_arch_info != NULL);
 724 }
 725
 726 /* */
 727
 728 extern initialize_file_ftype _initialize_gdbarch_utils; /* -Wmissing-prototypes */
 729
 730 void
 731 _initialize_gdbarch_utils (void)
 732 {
 733   struct cmd_list_element *c;
 734   add_setshow_enum_cmd ("endian", class_support,
 735                         endian_enum, &set_endian_string, _("\
 736 Set endianness of target."), _("\
 737 Show endianness of target."), NULL,
 738                         set_endian, show_endian,
 739                         &setlist, &showlist);
 740 }