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, 2006, 2007
   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 3 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, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "defs.h"
  22
  23 #include "arch-utils.h"
  24 #include "buildsym.h"
  25 #include "gdbcmd.h"
  26 #include "inferior.h"           /* enum CALL_DUMMY_LOCATION et.al. */
  27 #include "gdb_string.h"
  28 #include "regcache.h"
  29 #include "gdb_assert.h"
  30 #include "sim-regno.h"
  31 #include "gdbcore.h"
  32 #include "osabi.h"
  33 #include "target-descriptions.h"
  34
  35 #include "version.h"
  36
  37 #include "floatformat.h"
  38
  39
  40 int
  41 legacy_register_sim_regno (int regnum)
  42 {
  43   /* Only makes sense to supply raw registers.  */
  44   gdb_assert (regnum >= 0 && regnum < gdbarch_num_regs (current_gdbarch));
  45   /* NOTE: cagney/2002-05-13: The old code did it this way and it is
  46      suspected that some GDB/SIM combinations may rely on this
  47      behavour.  The default should be one2one_register_sim_regno
  48      (below).  */
  49   if (gdbarch_register_name (current_gdbarch, regnum) != NULL
  50       && gdbarch_register_name (current_gdbarch, regnum)[0] != '\0')
  51     return regnum;
  52   else
  53     return LEGACY_SIM_REGNO_IGNORE;
  54 }
  55
  56 CORE_ADDR
  57 generic_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
  58 {
  59   return 0;
  60 }
  61
  62 CORE_ADDR
  63 generic_skip_solib_resolver (struct gdbarch *gdbarch, CORE_ADDR pc)
  64 {
  65   return 0;
  66 }
  67
  68 int
  69 generic_in_solib_return_trampoline (CORE_ADDR pc, char *name)
  70 {
  71   return 0;
  72 }
  73
  74 int
  75 generic_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
  76 {
  77   return 0;
  78 }
  79
  80 /* Helper functions for gdbarch_inner_than */
  81
  82 int
  83 core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs)
  84 {
  85   return (lhs < rhs);
  86 }
  87
  88 int
  89 core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs)
  90 {
  91   return (lhs > rhs);
  92 }
  93
  94 /* Misc helper functions for targets. */
  95
  96 CORE_ADDR
  97 core_addr_identity (CORE_ADDR addr)
  98 {
  99   return addr;
 100 }
 101
 102 CORE_ADDR
 103 convert_from_func_ptr_addr_identity (struct gdbarch *gdbarch, CORE_ADDR addr,
 104                                      struct target_ops *targ)
 105 {
 106   return addr;
 107 }
 108
 109 int
 110 no_op_reg_to_regnum (int reg)
 111 {
 112   return reg;
 113 }
 114
 115 void
 116 default_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym)
 117 {
 118   return;
 119 }
 120
 121 void
 122 default_coff_make_msymbol_special (int val, struct minimal_symbol *msym)
 123 {
 124   return;
 125 }
 126
 127 int
 128 cannot_register_not (int regnum)
 129 {
 130   return 0;
 131 }
 132
 133 /* Legacy version of target_virtual_frame_pointer().  Assumes that
 134    there is an gdbarch_deprecated_fp_regnum and that it is the same, cooked or
 135    raw.  */
 136
 137 void
 138 legacy_virtual_frame_pointer (CORE_ADDR pc,
 139                               int *frame_regnum,
 140                               LONGEST *frame_offset)
 141 {
 142   /* FIXME: cagney/2002-09-13: This code is used when identifying the
 143      frame pointer of the current PC.  It is assuming that a single
 144      register and an offset can determine this.  I think it should
 145      instead generate a byte code expression as that would work better
 146      with things like Dwarf2's CFI.  */
 147   if (gdbarch_deprecated_fp_regnum (current_gdbarch) >= 0
 148       && gdbarch_deprecated_fp_regnum (current_gdbarch)
 149            < gdbarch_num_regs (current_gdbarch))
 150     *frame_regnum = gdbarch_deprecated_fp_regnum (current_gdbarch);
 151   else if (gdbarch_sp_regnum (current_gdbarch) >= 0
 152            && gdbarch_sp_regnum (current_gdbarch)
 153                 < gdbarch_num_regs (current_gdbarch))
 154     *frame_regnum = gdbarch_sp_regnum (current_gdbarch);
 155   else
 156     /* Should this be an internal error?  I guess so, it is reflecting
 157        an architectural limitation in the current design.  */
 158     internal_error (__FILE__, __LINE__, _("No virtual frame pointer available"));
 159   *frame_offset = 0;
 160 }
 161
 162 \f
 163 int
 164 generic_convert_register_p (int regnum, struct type *type)
 165 {
 166   return 0;
 167 }
 168
 169 int
 170 default_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type)
 171 {
 172   return 0;
 173 }
 174
 175 int
 176 generic_instruction_nullified (struct gdbarch *gdbarch,
 177                                struct regcache *regcache)
 178 {
 179   return 0;
 180 }
 181
 182 int
 183 default_remote_register_number (struct gdbarch *gdbarch,
 184                                 int regno)
 185 {
 186   return regno;
 187 }
 188
 189 \f
 190 /* Functions to manipulate the endianness of the target.  */
 191
 192 static int target_byte_order_user = BFD_ENDIAN_UNKNOWN;
 193
 194 static const char endian_big[] = "big";
 195 static const char endian_little[] = "little";
 196 static const char endian_auto[] = "auto";
 197 static const char *endian_enum[] =
 198 {
 199   endian_big,
 200   endian_little,
 201   endian_auto,
 202   NULL,
 203 };
 204 static const char *set_endian_string;
 205
 206 enum bfd_endian
 207 selected_byte_order (void)
 208 {
 209   if (target_byte_order_user != BFD_ENDIAN_UNKNOWN)
 210     return gdbarch_byte_order (current_gdbarch);
 211   else
 212     return BFD_ENDIAN_UNKNOWN;
 213 }
 214
 215 /* Called by ``show endian''.  */
 216
 217 static void
 218 show_endian (struct ui_file *file, int from_tty, struct cmd_list_element *c,
 219              const char *value)
 220 {
 221   if (target_byte_order_user == BFD_ENDIAN_UNKNOWN)
 222     if (gdbarch_byte_order (current_gdbarch) == BFD_ENDIAN_BIG)
 223       fprintf_unfiltered (file, _("The target endianness is set automatically "
 224                                   "(currently big endian)\n"));
 225     else
 226       fprintf_unfiltered (file, _("The target endianness is set automatically "
 227                            "(currently little endian)\n"));
 228   else
 229     if (gdbarch_byte_order (current_gdbarch) == BFD_ENDIAN_BIG)
 230       fprintf_unfiltered (file,
 231                           _("The target is assumed to be big endian\n"));
 232     else
 233       fprintf_unfiltered (file,
 234                           _("The target is assumed to be little endian\n"));
 235 }
 236
 237 static void
 238 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
 239 {
 240   struct gdbarch_info info;
 241
 242   gdbarch_info_init (&info);
 243
 244   if (set_endian_string == endian_auto)
 245     {
 246       target_byte_order_user = BFD_ENDIAN_UNKNOWN;
 247       if (! gdbarch_update_p (info))
 248         internal_error (__FILE__, __LINE__,
 249                         _("set_endian: architecture update failed"));
 250     }
 251   else if (set_endian_string == endian_little)
 252     {
 253       info.byte_order = BFD_ENDIAN_LITTLE;
 254       if (! gdbarch_update_p (info))
 255         printf_unfiltered (_("Little endian target not supported by GDB\n"));
 256       else
 257         target_byte_order_user = BFD_ENDIAN_LITTLE;
 258     }
 259   else if (set_endian_string == endian_big)
 260     {
 261       info.byte_order = BFD_ENDIAN_BIG;
 262       if (! gdbarch_update_p (info))
 263         printf_unfiltered (_("Big endian target not supported by GDB\n"));
 264       else
 265         target_byte_order_user = BFD_ENDIAN_BIG;
 266     }
 267   else
 268     internal_error (__FILE__, __LINE__,
 269                     _("set_endian: bad value"));
 270
 271   show_endian (gdb_stdout, from_tty, NULL, NULL);
 272 }
 273
 274 /* Given SELECTED, a currently selected BFD architecture, and
 275    FROM_TARGET, a BFD architecture reported by the target description,
 276    return what architecture to use.  Either may be NULL; if both are
 277    specified, we use the more specific.  If the two are obviously
 278    incompatible, warn the user.  */
 279
 280 static const struct bfd_arch_info *
 281 choose_architecture_for_target (const struct bfd_arch_info *selected,
 282                                 const struct bfd_arch_info *from_target)
 283 {
 284   const struct bfd_arch_info *compat1, *compat2;
 285
 286   if (selected == NULL)
 287     return from_target;
 288
 289   if (from_target == NULL)
 290     return selected;
 291
 292   /* struct bfd_arch_info objects are singletons: that is, there's
 293      supposed to be exactly one instance for a given machine.  So you
 294      can tell whether two are equivalent by comparing pointers.  */
 295   if (from_target == selected)
 296     return selected;
 297
 298   /* BFD's 'A->compatible (A, B)' functions return zero if A and B are
 299      incompatible.  But if they are compatible, it returns the 'more
 300      featureful' of the two arches.  That is, if A can run code
 301      written for B, but B can't run code written for A, then it'll
 302      return A.
 303
 304      Some targets (e.g. MIPS as of 2006-12-04) don't fully
 305      implement this, instead always returning NULL or the first
 306      argument.  We detect that case by checking both directions.  */
 307
 308   compat1 = selected->compatible (selected, from_target);
 309   compat2 = from_target->compatible (from_target, selected);
 310
 311   if (compat1 == NULL && compat2 == NULL)
 312     {
 313       warning (_("Selected architecture %s is not compatible "
 314                  "with reported target architecture %s"),
 315                selected->printable_name, from_target->printable_name);
 316       return selected;
 317     }
 318
 319   if (compat1 == NULL)
 320     return compat2;
 321   if (compat2 == NULL)
 322     return compat1;
 323   if (compat1 == compat2)
 324     return compat1;
 325
 326   /* If the two didn't match, but one of them was a default architecture,
 327      assume the more specific one is correct.  This handles the case
 328      where an executable or target description just says "mips", but
 329      the other knows which MIPS variant.  */
 330   if (compat1->the_default)
 331     return compat2;
 332   if (compat2->the_default)
 333     return compat1;
 334
 335   /* We have no idea which one is better.  This is a bug, but not
 336      a critical problem; warn the user.  */
 337   warning (_("Selected architecture %s is ambiguous with "
 338              "reported target architecture %s"),
 339            selected->printable_name, from_target->printable_name);
 340   return selected;
 341 }
 342
 343 /* Functions to manipulate the architecture of the target */
 344
 345 enum set_arch { set_arch_auto, set_arch_manual };
 346
 347 static const struct bfd_arch_info *target_architecture_user;
 348
 349 static const char *set_architecture_string;
 350
 351 const char *
 352 selected_architecture_name (void)
 353 {
 354   if (target_architecture_user == NULL)
 355     return NULL;
 356   else
 357     return set_architecture_string;
 358 }
 359
 360 /* Called if the user enters ``show architecture'' without an
 361    argument. */
 362
 363 static void
 364 show_architecture (struct ui_file *file, int from_tty,
 365                    struct cmd_list_element *c, const char *value)
 366 {
 367   const char *arch;
 368   arch = gdbarch_bfd_arch_info (current_gdbarch)->printable_name;
 369   if (target_architecture_user == NULL)
 370     fprintf_filtered (file, _("\
 371 The target architecture is set automatically (currently %s)\n"), arch);
 372   else
 373     fprintf_filtered (file, _("\
 374 The target architecture is assumed to be %s\n"), arch);
 375 }
 376
 377
 378 /* Called if the user enters ``set architecture'' with or without an
 379    argument. */
 380
 381 static void
 382 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
 383 {
 384   struct gdbarch_info info;
 385
 386   gdbarch_info_init (&info);
 387
 388   if (strcmp (set_architecture_string, "auto") == 0)
 389     {
 390       target_architecture_user = NULL;
 391       if (!gdbarch_update_p (info))
 392         internal_error (__FILE__, __LINE__,
 393                         _("could not select an architecture automatically"));
 394     }
 395   else
 396     {
 397       info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
 398       if (info.bfd_arch_info == NULL)
 399         internal_error (__FILE__, __LINE__,
 400                         _("set_architecture: bfd_scan_arch failed"));
 401       if (gdbarch_update_p (info))
 402         target_architecture_user = info.bfd_arch_info;
 403       else
 404         printf_unfiltered (_("Architecture `%s' not recognized.\n"),
 405                            set_architecture_string);
 406     }
 407   show_architecture (gdb_stdout, from_tty, NULL, NULL);
 408 }
 409
 410 /* Try to select a global architecture that matches "info".  Return
 411    non-zero if the attempt succeds.  */
 412 int
 413 gdbarch_update_p (struct gdbarch_info info)
 414 {
 415   struct gdbarch *new_gdbarch = gdbarch_find_by_info (info);
 416
 417   /* If there no architecture by that name, reject the request.  */
 418   if (new_gdbarch == NULL)
 419     {
 420       if (gdbarch_debug)
 421         fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 422                             "Architecture not found\n");
 423       return 0;
 424     }
 425
 426   /* If it is the same old architecture, accept the request (but don't
 427      swap anything).  */
 428   if (new_gdbarch == current_gdbarch)
 429     {
 430       if (gdbarch_debug)
 431         fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 432                             "Architecture 0x%08lx (%s) unchanged\n",
 433                             (long) new_gdbarch,
 434                             gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
 435       return 1;
 436     }
 437
 438   /* It's a new architecture, swap it in.  */
 439   if (gdbarch_debug)
 440     fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 441                         "New architecture 0x%08lx (%s) selected\n",
 442                         (long) new_gdbarch,
 443                         gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
 444   deprecated_current_gdbarch_select_hack (new_gdbarch);
 445
 446   return 1;
 447 }
 448
 449 /* Return the architecture for ABFD.  If no suitable architecture
 450    could be find, return NULL.  */
 451
 452 struct gdbarch *
 453 gdbarch_from_bfd (bfd *abfd)
 454 {
 455   struct gdbarch *old_gdbarch = current_gdbarch;
 456   struct gdbarch *new_gdbarch;
 457   struct gdbarch_info info;
 458
 459   /* If we call gdbarch_find_by_info without filling in info.abfd,
 460      then it will use the global exec_bfd.  That's fine if we don't
 461      have one of those either.  And that's the only time we should
 462      reach here with a NULL ABFD argument - when we are discarding
 463      the executable.  */
 464   gdb_assert (abfd != NULL || exec_bfd == NULL);
 465
 466   gdbarch_info_init (&info);
 467   info.abfd = abfd;
 468   return gdbarch_find_by_info (info);
 469 }
 470
 471 /* Set the dynamic target-system-dependent parameters (architecture,
 472    byte-order) using information found in the BFD */
 473
 474 void
 475 set_gdbarch_from_file (bfd *abfd)
 476 {
 477   struct gdbarch *gdbarch;
 478
 479   gdbarch = gdbarch_from_bfd (abfd);
 480   if (gdbarch == NULL)
 481     error (_("Architecture of file not recognized."));
 482   deprecated_current_gdbarch_select_hack (gdbarch);
 483 }
 484
 485 /* Initialize the current architecture.  Update the ``set
 486    architecture'' command so that it specifies a list of valid
 487    architectures.  */
 488
 489 #ifdef DEFAULT_BFD_ARCH
 490 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
 491 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
 492 #else
 493 static const bfd_arch_info_type *default_bfd_arch;
 494 #endif
 495
 496 #ifdef DEFAULT_BFD_VEC
 497 extern const bfd_target DEFAULT_BFD_VEC;
 498 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
 499 #else
 500 static const bfd_target *default_bfd_vec;
 501 #endif
 502
 503 static int default_byte_order = BFD_ENDIAN_UNKNOWN;
 504
 505 void
 506 initialize_current_architecture (void)
 507 {
 508   const char **arches = gdbarch_printable_names ();
 509
 510   /* determine a default architecture and byte order. */
 511   struct gdbarch_info info;
 512   gdbarch_info_init (&info);
 513
 514   /* Find a default architecture. */
 515   if (default_bfd_arch == NULL)
 516     {
 517       /* Choose the architecture by taking the first one
 518          alphabetically. */
 519       const char *chosen = arches[0];
 520       const char **arch;
 521       for (arch = arches; *arch != NULL; arch++)
 522         {
 523           if (strcmp (*arch, chosen) < 0)
 524             chosen = *arch;
 525         }
 526       if (chosen == NULL)
 527         internal_error (__FILE__, __LINE__,
 528                         _("initialize_current_architecture: No arch"));
 529       default_bfd_arch = bfd_scan_arch (chosen);
 530       if (default_bfd_arch == NULL)
 531         internal_error (__FILE__, __LINE__,
 532                         _("initialize_current_architecture: Arch not found"));
 533     }
 534
 535   info.bfd_arch_info = default_bfd_arch;
 536
 537   /* Take several guesses at a byte order.  */
 538   if (default_byte_order == BFD_ENDIAN_UNKNOWN
 539       && default_bfd_vec != NULL)
 540     {
 541       /* Extract BFD's default vector's byte order. */
 542       switch (default_bfd_vec->byteorder)
 543         {
 544         case BFD_ENDIAN_BIG:
 545           default_byte_order = BFD_ENDIAN_BIG;
 546           break;
 547         case BFD_ENDIAN_LITTLE:
 548           default_byte_order = BFD_ENDIAN_LITTLE;
 549           break;
 550         default:
 551           break;
 552         }
 553     }
 554   if (default_byte_order == BFD_ENDIAN_UNKNOWN)
 555     {
 556       /* look for ``*el-*'' in the target name. */
 557       const char *chp;
 558       chp = strchr (target_name, '-');
 559       if (chp != NULL
 560           && chp - 2 >= target_name
 561           && strncmp (chp - 2, "el", 2) == 0)
 562         default_byte_order = BFD_ENDIAN_LITTLE;
 563     }
 564   if (default_byte_order == BFD_ENDIAN_UNKNOWN)
 565     {
 566       /* Wire it to big-endian!!! */
 567       default_byte_order = BFD_ENDIAN_BIG;
 568     }
 569
 570   info.byte_order = default_byte_order;
 571
 572   if (! gdbarch_update_p (info))
 573     internal_error (__FILE__, __LINE__,
 574                     _("initialize_current_architecture: Selection of "
 575                       "initial architecture failed"));
 576
 577   /* Create the ``set architecture'' command appending ``auto'' to the
 578      list of architectures. */
 579   {
 580     struct cmd_list_element *c;
 581     /* Append ``auto''. */
 582     int nr;
 583     for (nr = 0; arches[nr] != NULL; nr++);
 584     arches = xrealloc (arches, sizeof (char*) * (nr + 2));
 585     arches[nr + 0] = "auto";
 586     arches[nr + 1] = NULL;
 587     add_setshow_enum_cmd ("architecture", class_support,
 588                           arches, &set_architecture_string, _("\
 589 Set architecture of target."), _("\
 590 Show architecture of target."), NULL,
 591                           set_architecture, show_architecture,
 592                           &setlist, &showlist);
 593     add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
 594   }
 595 }
 596
 597
 598 /* Initialize a gdbarch info to values that will be automatically
 599    overridden.  Note: Originally, this ``struct info'' was initialized
 600    using memset(0).  Unfortunately, that ran into problems, namely
 601    BFD_ENDIAN_BIG is zero.  An explicit initialization function that
 602    can explicitly set each field to a well defined value is used.  */
 603
 604 void
 605 gdbarch_info_init (struct gdbarch_info *info)
 606 {
 607   memset (info, 0, sizeof (struct gdbarch_info));
 608   info->byte_order = BFD_ENDIAN_UNKNOWN;
 609   info->osabi = GDB_OSABI_UNINITIALIZED;
 610 }
 611
 612 /* Similar to init, but this time fill in the blanks.  Information is
 613    obtained from the global "set ..." options and explicitly
 614    initialized INFO fields.  */
 615
 616 void
 617 gdbarch_info_fill (struct gdbarch_info *info)
 618 {
 619   /* Check for the current file.  */
 620   if (info->abfd == NULL)
 621     info->abfd = exec_bfd;
 622   if (info->abfd == NULL)
 623     info->abfd = core_bfd;
 624
 625   /* Check for the current target description.  */
 626   if (info->target_desc == NULL)
 627     info->target_desc = target_current_description ();
 628
 629   /* "(gdb) set architecture ...".  */
 630   if (info->bfd_arch_info == NULL
 631       && target_architecture_user)
 632     info->bfd_arch_info = target_architecture_user;
 633   /* From the file.  */
 634   if (info->bfd_arch_info == NULL
 635       && info->abfd != NULL
 636       && bfd_get_arch (info->abfd) != bfd_arch_unknown
 637       && bfd_get_arch (info->abfd) != bfd_arch_obscure)
 638     info->bfd_arch_info = bfd_get_arch_info (info->abfd);
 639   /* From the target.  */
 640   if (info->target_desc != NULL)
 641     info->bfd_arch_info = choose_architecture_for_target
 642       (info->bfd_arch_info, tdesc_architecture (info->target_desc));
 643   /* From the default.  */
 644   if (info->bfd_arch_info == NULL)
 645     info->bfd_arch_info = default_bfd_arch;
 646
 647   /* "(gdb) set byte-order ...".  */
 648   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 649       && target_byte_order_user != BFD_ENDIAN_UNKNOWN)
 650     info->byte_order = target_byte_order_user;
 651   /* From the INFO struct.  */
 652   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 653       && info->abfd != NULL)
 654     info->byte_order = (bfd_big_endian (info->abfd) ? BFD_ENDIAN_BIG
 655                         : bfd_little_endian (info->abfd) ? BFD_ENDIAN_LITTLE
 656                         : BFD_ENDIAN_UNKNOWN);
 657   /* From the default.  */
 658   if (info->byte_order == BFD_ENDIAN_UNKNOWN)
 659     info->byte_order = default_byte_order;
 660
 661   /* "(gdb) set osabi ...".  Handled by gdbarch_lookup_osabi.  */
 662   if (info->osabi == GDB_OSABI_UNINITIALIZED)
 663     info->osabi = gdbarch_lookup_osabi (info->abfd);
 664
 665   /* Must have at least filled in the architecture.  */
 666   gdb_assert (info->bfd_arch_info != NULL);
 667 }
 668
 669 /* */
 670
 671 extern initialize_file_ftype _initialize_gdbarch_utils; /* -Wmissing-prototypes */
 672
 673 void
 674 _initialize_gdbarch_utils (void)
 675 {
 676   struct cmd_list_element *c;
 677   add_setshow_enum_cmd ("endian", class_support,
 678                         endian_enum, &set_endian_string, _("\
 679 Set endianness of target."), _("\
 680 Show endianness of target."), NULL,
 681                         set_endian, show_endian,
 682                         &setlist, &showlist);
 683 }