gdb/arch-utils.c

   1 /* Dynamic architecture support for GDB, the GNU debugger.
   2
   3    Copyright 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation,
   4    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., 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, 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
  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                              void *valbuf)
  45 {
  46   char *registers = deprecated_grub_regcache_for_registers (regcache);
  47   bfd_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 void *buf)
  56 {
  57   bfd_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
  64 int
  65 always_use_struct_convention (int gcc_p, struct type *value_type)
  66 {
  67   return 1;
  68 }
  69
  70
  71 int
  72 legacy_register_sim_regno (int regnum)
  73 {
  74   /* Only makes sense to supply raw registers.  */
  75   gdb_assert (regnum >= 0 && regnum < NUM_REGS);
  76   /* NOTE: cagney/2002-05-13: The old code did it this way and it is
  77      suspected that some GDB/SIM combinations may rely on this
  78      behavour.  The default should be one2one_register_sim_regno
  79      (below).  */
  80   if (REGISTER_NAME (regnum) != NULL
  81       && REGISTER_NAME (regnum)[0] != '\0')
  82     return regnum;
  83   else
  84     return LEGACY_SIM_REGNO_IGNORE;
  85 }
  86
  87 int
  88 generic_return_value_on_stack_not (struct type *type)
  89 {
  90   return 0;
  91 }
  92
  93 CORE_ADDR
  94 generic_skip_trampoline_code (CORE_ADDR pc)
  95 {
  96   return 0;
  97 }
  98
  99 CORE_ADDR
 100 generic_skip_solib_resolver (struct gdbarch *gdbarch, CORE_ADDR pc)
 101 {
 102   return 0;
 103 }
 104
 105 int
 106 generic_in_solib_call_trampoline (CORE_ADDR pc, char *name)
 107 {
 108   return 0;
 109 }
 110
 111 int
 112 generic_in_solib_return_trampoline (CORE_ADDR pc, char *name)
 113 {
 114   return 0;
 115 }
 116
 117 int
 118 generic_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
 119 {
 120   return 0;
 121 }
 122
 123 void
 124 generic_remote_translate_xfer_address (struct gdbarch *gdbarch,
 125                                        struct regcache *regcache,
 126                                        CORE_ADDR gdb_addr, int gdb_len,
 127                                        CORE_ADDR * rem_addr, int *rem_len)
 128 {
 129   *rem_addr = gdb_addr;
 130   *rem_len = gdb_len;
 131 }
 132
 133 /* Helper functions for INNER_THAN */
 134
 135 int
 136 core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs)
 137 {
 138   return (lhs < rhs);
 139 }
 140
 141 int
 142 core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs)
 143 {
 144   return (lhs > rhs);
 145 }
 146
 147
 148 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
 149
 150 const struct floatformat *
 151 default_float_format (struct gdbarch *gdbarch)
 152 {
 153   int byte_order = gdbarch_byte_order (gdbarch);
 154   switch (byte_order)
 155     {
 156     case BFD_ENDIAN_BIG:
 157       return &floatformat_ieee_single_big;
 158     case BFD_ENDIAN_LITTLE:
 159       return &floatformat_ieee_single_little;
 160     default:
 161       internal_error (__FILE__, __LINE__,
 162                       "default_float_format: bad byte order");
 163     }
 164 }
 165
 166
 167 const struct floatformat *
 168 default_double_format (struct gdbarch *gdbarch)
 169 {
 170   int byte_order = gdbarch_byte_order (gdbarch);
 171   switch (byte_order)
 172     {
 173     case BFD_ENDIAN_BIG:
 174       return &floatformat_ieee_double_big;
 175     case BFD_ENDIAN_LITTLE:
 176       return &floatformat_ieee_double_little;
 177     default:
 178       internal_error (__FILE__, __LINE__,
 179                       "default_double_format: bad byte order");
 180     }
 181 }
 182
 183 /* Misc helper functions for targets. */
 184
 185 CORE_ADDR
 186 core_addr_identity (CORE_ADDR addr)
 187 {
 188   return addr;
 189 }
 190
 191 CORE_ADDR
 192 convert_from_func_ptr_addr_identity (struct gdbarch *gdbarch, CORE_ADDR addr,
 193                                      struct target_ops *targ)
 194 {
 195   return addr;
 196 }
 197
 198 int
 199 no_op_reg_to_regnum (int reg)
 200 {
 201   return reg;
 202 }
 203
 204 CORE_ADDR
 205 deprecated_init_frame_pc_default (int fromleaf, struct frame_info *prev)
 206 {
 207   if (fromleaf && DEPRECATED_SAVED_PC_AFTER_CALL_P ())
 208     return DEPRECATED_SAVED_PC_AFTER_CALL (get_next_frame (prev));
 209   else if (get_next_frame (prev) != NULL)
 210     return DEPRECATED_FRAME_SAVED_PC (get_next_frame (prev));
 211   else
 212     return read_pc ();
 213 }
 214
 215 void
 216 default_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym)
 217 {
 218   return;
 219 }
 220
 221 void
 222 default_coff_make_msymbol_special (int val, struct minimal_symbol *msym)
 223 {
 224   return;
 225 }
 226
 227 int
 228 cannot_register_not (int regnum)
 229 {
 230   return 0;
 231 }
 232
 233 /* Legacy version of target_virtual_frame_pointer().  Assumes that
 234    there is an DEPRECATED_FP_REGNUM and that it is the same, cooked or
 235    raw.  */
 236
 237 void
 238 legacy_virtual_frame_pointer (CORE_ADDR pc,
 239                               int *frame_regnum,
 240                               LONGEST *frame_offset)
 241 {
 242   /* FIXME: cagney/2002-09-13: This code is used when identifying the
 243      frame pointer of the current PC.  It is assuming that a single
 244      register and an offset can determine this.  I think it should
 245      instead generate a byte code expression as that would work better
 246      with things like Dwarf2's CFI.  */
 247   if (DEPRECATED_FP_REGNUM >= 0 && DEPRECATED_FP_REGNUM < NUM_REGS)
 248     *frame_regnum = DEPRECATED_FP_REGNUM;
 249   else if (SP_REGNUM >= 0 && SP_REGNUM < NUM_REGS)
 250     *frame_regnum = SP_REGNUM;
 251   else
 252     /* Should this be an internal error?  I guess so, it is reflecting
 253        an architectural limitation in the current design.  */
 254     internal_error (__FILE__, __LINE__, "No virtual frame pointer available");
 255   *frame_offset = 0;
 256 }
 257
 258 /* Assume the world is sane, every register's virtual and real size
 259    is identical.  */
 260
 261 int
 262 generic_register_size (int regnum)
 263 {
 264   gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
 265   if (gdbarch_register_type_p (current_gdbarch))
 266     return TYPE_LENGTH (gdbarch_register_type (current_gdbarch, regnum));
 267   else
 268     /* FIXME: cagney/2003-03-01: Once all architectures implement
 269        gdbarch_register_type(), this entire function can go away.  It
 270        is made obsolete by register_size().  */
 271     return TYPE_LENGTH (DEPRECATED_REGISTER_VIRTUAL_TYPE (regnum)); /* OK */
 272 }
 273
 274 /* Assume all registers are adjacent.  */
 275
 276 int
 277 generic_register_byte (int regnum)
 278 {
 279   int byte;
 280   int i;
 281   gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
 282   byte = 0;
 283   for (i = 0; i < regnum; i++)
 284     {
 285       byte += generic_register_size (i);
 286     }
 287   return byte;
 288 }
 289
 290 \f
 291 int
 292 legacy_pc_in_sigtramp (CORE_ADDR pc, char *name)
 293 {
 294 #if defined (DEPRECATED_IN_SIGTRAMP)
 295   return DEPRECATED_IN_SIGTRAMP (pc, name);
 296 #else
 297   return name && strcmp ("_sigtramp", name) == 0;
 298 #endif
 299 }
 300
 301 int
 302 generic_convert_register_p (int regnum, struct type *type)
 303 {
 304   return 0;
 305 }
 306
 307 int
 308 default_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type)
 309 {
 310   if (DEPRECATED_REG_STRUCT_HAS_ADDR_P ()
 311       && DEPRECATED_REG_STRUCT_HAS_ADDR (processing_gcc_compilation, type))
 312     {
 313       CHECK_TYPEDEF (type);
 314
 315       return (TYPE_CODE (type) == TYPE_CODE_STRUCT
 316               || TYPE_CODE (type) == TYPE_CODE_UNION
 317               || TYPE_CODE (type) == TYPE_CODE_SET
 318               || TYPE_CODE (type) == TYPE_CODE_BITSTRING);
 319     }
 320
 321   return 0;
 322 }
 323
 324 \f
 325 /* Functions to manipulate the endianness of the target.  */
 326
 327 /* ``target_byte_order'' is only used when non- multi-arch.
 328    Multi-arch targets obtain the current byte order using the
 329    TARGET_BYTE_ORDER gdbarch method.
 330
 331    The choice of initial value is entirely arbitrary.  During startup,
 332    the function initialize_current_architecture() updates this value
 333    based on default byte-order information extracted from BFD.  */
 334 static int target_byte_order = BFD_ENDIAN_BIG;
 335 static int target_byte_order_auto = 1;
 336
 337 enum bfd_endian
 338 selected_byte_order (void)
 339 {
 340   if (target_byte_order_auto)
 341     return BFD_ENDIAN_UNKNOWN;
 342   else
 343     return target_byte_order;
 344 }
 345
 346 static const char endian_big[] = "big";
 347 static const char endian_little[] = "little";
 348 static const char endian_auto[] = "auto";
 349 static const char *endian_enum[] =
 350 {
 351   endian_big,
 352   endian_little,
 353   endian_auto,
 354   NULL,
 355 };
 356 static const char *set_endian_string;
 357
 358 /* Called by ``show endian''.  */
 359
 360 static void
 361 show_endian (char *args, int from_tty)
 362 {
 363   if (target_byte_order_auto)
 364     printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
 365                        (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
 366   else
 367     printf_unfiltered ("The target is assumed to be %s endian\n",
 368                        (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
 369 }
 370
 371 static void
 372 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
 373 {
 374   if (set_endian_string == endian_auto)
 375     {
 376       target_byte_order_auto = 1;
 377     }
 378   else if (set_endian_string == endian_little)
 379     {
 380       struct gdbarch_info info;
 381       target_byte_order_auto = 0;
 382       gdbarch_info_init (&info);
 383       info.byte_order = BFD_ENDIAN_LITTLE;
 384       if (! gdbarch_update_p (info))
 385         printf_unfiltered ("Little endian target not supported by GDB\n");
 386     }
 387   else if (set_endian_string == endian_big)
 388     {
 389       struct gdbarch_info info;
 390       target_byte_order_auto = 0;
 391       gdbarch_info_init (&info);
 392       info.byte_order = BFD_ENDIAN_BIG;
 393       if (! gdbarch_update_p (info))
 394         printf_unfiltered ("Big endian target not supported by GDB\n");
 395     }
 396   else
 397     internal_error (__FILE__, __LINE__,
 398                     "set_endian: bad value");
 399   show_endian (NULL, from_tty);
 400 }
 401
 402 /* Functions to manipulate the architecture of the target */
 403
 404 enum set_arch { set_arch_auto, set_arch_manual };
 405
 406 static int target_architecture_auto = 1;
 407
 408 static const char *set_architecture_string;
 409
 410 const char *
 411 selected_architecture_name (void)
 412 {
 413   if (target_architecture_auto)
 414     return NULL;
 415   else
 416     return set_architecture_string;
 417 }
 418
 419 /* Called if the user enters ``show architecture'' without an
 420    argument. */
 421
 422 static void
 423 show_architecture (char *args, int from_tty)
 424 {
 425   const char *arch;
 426   arch = TARGET_ARCHITECTURE->printable_name;
 427   if (target_architecture_auto)
 428     printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
 429   else
 430     printf_filtered ("The target architecture is assumed to be %s\n", arch);
 431 }
 432
 433
 434 /* Called if the user enters ``set architecture'' with or without an
 435    argument. */
 436
 437 static void
 438 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
 439 {
 440   if (strcmp (set_architecture_string, "auto") == 0)
 441     {
 442       target_architecture_auto = 1;
 443     }
 444   else
 445     {
 446       struct gdbarch_info info;
 447       gdbarch_info_init (&info);
 448       info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
 449       if (info.bfd_arch_info == NULL)
 450         internal_error (__FILE__, __LINE__,
 451                         "set_architecture: bfd_scan_arch failed");
 452       if (gdbarch_update_p (info))
 453         target_architecture_auto = 0;
 454       else
 455         printf_unfiltered ("Architecture `%s' not recognized.\n",
 456                            set_architecture_string);
 457     }
 458   show_architecture (NULL, from_tty);
 459 }
 460
 461 /* Try to select a global architecture that matches "info".  Return
 462    non-zero if the attempt succeds.  */
 463 int
 464 gdbarch_update_p (struct gdbarch_info info)
 465 {
 466   struct gdbarch *new_gdbarch = gdbarch_find_by_info (info);
 467
 468   /* If there no architecture by that name, reject the request.  */
 469   if (new_gdbarch == NULL)
 470     {
 471       if (gdbarch_debug)
 472         fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 473                             "Architecture not found\n");
 474       return 0;
 475     }
 476
 477   /* If it is the same old architecture, accept the request (but don't
 478      swap anything).  */
 479   if (new_gdbarch == current_gdbarch)
 480     {
 481       if (gdbarch_debug)
 482         fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 483                             "Architecture 0x%08lx (%s) unchanged\n",
 484                             (long) new_gdbarch,
 485                             gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
 486       return 1;
 487     }
 488
 489   /* It's a new architecture, swap it in.  */
 490   if (gdbarch_debug)
 491     fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 492                         "New architecture 0x%08lx (%s) selected\n",
 493                         (long) new_gdbarch,
 494                         gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
 495   deprecated_current_gdbarch_select_hack (new_gdbarch);
 496
 497   return 1;
 498 }
 499
 500 /* Return the architecture for ABFD.  If no suitable architecture
 501    could be find, return NULL.  */
 502
 503 struct gdbarch *
 504 gdbarch_from_bfd (bfd *abfd)
 505 {
 506   struct gdbarch *old_gdbarch = current_gdbarch;
 507   struct gdbarch *new_gdbarch;
 508   struct gdbarch_info info;
 509
 510   gdbarch_info_init (&info);
 511   info.abfd = abfd;
 512   return gdbarch_find_by_info (info);
 513 }
 514
 515 /* Set the dynamic target-system-dependent parameters (architecture,
 516    byte-order) using information found in the BFD */
 517
 518 void
 519 set_gdbarch_from_file (bfd *abfd)
 520 {
 521   struct gdbarch *gdbarch;
 522
 523   gdbarch = gdbarch_from_bfd (abfd);
 524   if (gdbarch == NULL)
 525     error ("Architecture of file not recognized.\n");
 526   deprecated_current_gdbarch_select_hack (gdbarch);
 527 }
 528
 529 /* Initialize the current architecture.  Update the ``set
 530    architecture'' command so that it specifies a list of valid
 531    architectures.  */
 532
 533 #ifdef DEFAULT_BFD_ARCH
 534 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
 535 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
 536 #else
 537 static const bfd_arch_info_type *default_bfd_arch;
 538 #endif
 539
 540 #ifdef DEFAULT_BFD_VEC
 541 extern const bfd_target DEFAULT_BFD_VEC;
 542 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
 543 #else
 544 static const bfd_target *default_bfd_vec;
 545 #endif
 546
 547 void
 548 initialize_current_architecture (void)
 549 {
 550   const char **arches = gdbarch_printable_names ();
 551
 552   /* determine a default architecture and byte order. */
 553   struct gdbarch_info info;
 554   gdbarch_info_init (&info);
 555
 556   /* Find a default architecture. */
 557   if (info.bfd_arch_info == NULL
 558       && default_bfd_arch != NULL)
 559     info.bfd_arch_info = default_bfd_arch;
 560   if (info.bfd_arch_info == NULL)
 561     {
 562       /* Choose the architecture by taking the first one
 563          alphabetically. */
 564       const char *chosen = arches[0];
 565       const char **arch;
 566       for (arch = arches; *arch != NULL; arch++)
 567         {
 568           if (strcmp (*arch, chosen) < 0)
 569             chosen = *arch;
 570         }
 571       if (chosen == NULL)
 572         internal_error (__FILE__, __LINE__,
 573                         "initialize_current_architecture: No arch");
 574       info.bfd_arch_info = bfd_scan_arch (chosen);
 575       if (info.bfd_arch_info == NULL)
 576         internal_error (__FILE__, __LINE__,
 577                         "initialize_current_architecture: Arch not found");
 578     }
 579
 580   /* Take several guesses at a byte order.  */
 581   if (info.byte_order == BFD_ENDIAN_UNKNOWN
 582       && default_bfd_vec != NULL)
 583     {
 584       /* Extract BFD's default vector's byte order. */
 585       switch (default_bfd_vec->byteorder)
 586         {
 587         case BFD_ENDIAN_BIG:
 588           info.byte_order = BFD_ENDIAN_BIG;
 589           break;
 590         case BFD_ENDIAN_LITTLE:
 591           info.byte_order = BFD_ENDIAN_LITTLE;
 592           break;
 593         default:
 594           break;
 595         }
 596     }
 597   if (info.byte_order == BFD_ENDIAN_UNKNOWN)
 598     {
 599       /* look for ``*el-*'' in the target name. */
 600       const char *chp;
 601       chp = strchr (target_name, '-');
 602       if (chp != NULL
 603           && chp - 2 >= target_name
 604           && strncmp (chp - 2, "el", 2) == 0)
 605         info.byte_order = BFD_ENDIAN_LITTLE;
 606     }
 607   if (info.byte_order == BFD_ENDIAN_UNKNOWN)
 608     {
 609       /* Wire it to big-endian!!! */
 610       info.byte_order = BFD_ENDIAN_BIG;
 611     }
 612
 613   if (! gdbarch_update_p (info))
 614     internal_error (__FILE__, __LINE__,
 615                     "initialize_current_architecture: Selection of initial architecture failed");
 616
 617   /* Create the ``set architecture'' command appending ``auto'' to the
 618      list of architectures. */
 619   {
 620     struct cmd_list_element *c;
 621     /* Append ``auto''. */
 622     int nr;
 623     for (nr = 0; arches[nr] != NULL; nr++);
 624     arches = xrealloc (arches, sizeof (char*) * (nr + 2));
 625     arches[nr + 0] = "auto";
 626     arches[nr + 1] = NULL;
 627     /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
 628        of ``const char *''.  We just happen to know that the casts are
 629        safe. */
 630     c = add_set_enum_cmd ("architecture", class_support,
 631                           arches, &set_architecture_string,
 632                           "Set architecture of target.",
 633                           &setlist);
 634     set_cmd_sfunc (c, set_architecture);
 635     add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
 636     /* Don't use set_from_show - need to print both auto/manual and
 637        current setting. */
 638     add_cmd ("architecture", class_support, show_architecture,
 639              "Show the current target architecture", &showlist);
 640   }
 641 }
 642
 643
 644 /* Initialize a gdbarch info to values that will be automatically
 645    overridden.  Note: Originally, this ``struct info'' was initialized
 646    using memset(0).  Unfortunately, that ran into problems, namely
 647    BFD_ENDIAN_BIG is zero.  An explicit initialization function that
 648    can explicitly set each field to a well defined value is used.  */
 649
 650 void
 651 gdbarch_info_init (struct gdbarch_info *info)
 652 {
 653   memset (info, 0, sizeof (struct gdbarch_info));
 654   info->byte_order = BFD_ENDIAN_UNKNOWN;
 655   info->osabi = GDB_OSABI_UNINITIALIZED;
 656 }
 657
 658 /* Similar to init, but this time fill in the blanks.  Information is
 659    obtained from the specified architecture, global "set ..." options,
 660    and explicitly initialized INFO fields.  */
 661
 662 void
 663 gdbarch_info_fill (struct gdbarch *gdbarch, struct gdbarch_info *info)
 664 {
 665   /* "(gdb) set architecture ...".  */
 666   if (info->bfd_arch_info == NULL
 667       && !target_architecture_auto
 668       && gdbarch != NULL)
 669     info->bfd_arch_info = gdbarch_bfd_arch_info (gdbarch);
 670   if (info->bfd_arch_info == NULL
 671       && info->abfd != NULL
 672       && bfd_get_arch (info->abfd) != bfd_arch_unknown
 673       && bfd_get_arch (info->abfd) != bfd_arch_obscure)
 674     info->bfd_arch_info = bfd_get_arch_info (info->abfd);
 675   if (info->bfd_arch_info == NULL
 676       && gdbarch != NULL)
 677     info->bfd_arch_info = gdbarch_bfd_arch_info (gdbarch);
 678
 679   /* "(gdb) set byte-order ...".  */
 680   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 681       && !target_byte_order_auto
 682       && gdbarch != NULL)
 683     info->byte_order = gdbarch_byte_order (gdbarch);
 684   /* From the INFO struct.  */
 685   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 686       && info->abfd != NULL)
 687     info->byte_order = (bfd_big_endian (info->abfd) ? BFD_ENDIAN_BIG
 688                        : bfd_little_endian (info->abfd) ? BFD_ENDIAN_LITTLE
 689                        : BFD_ENDIAN_UNKNOWN);
 690   /* From the current target.  */
 691   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 692       && gdbarch != NULL)
 693     info->byte_order = gdbarch_byte_order (gdbarch);
 694
 695   /* "(gdb) set osabi ...".  Handled by gdbarch_lookup_osabi.  */
 696   if (info->osabi == GDB_OSABI_UNINITIALIZED)
 697     info->osabi = gdbarch_lookup_osabi (info->abfd);
 698   if (info->osabi == GDB_OSABI_UNINITIALIZED
 699       && gdbarch != NULL)
 700     info->osabi = gdbarch_osabi (gdbarch);
 701
 702   /* Must have at least filled in the architecture.  */
 703   gdb_assert (info->bfd_arch_info != NULL);
 704 }
 705
 706 /* */
 707
 708 extern initialize_file_ftype _initialize_gdbarch_utils; /* -Wmissing-prototypes */
 709
 710 void
 711 _initialize_gdbarch_utils (void)
 712 {
 713   struct cmd_list_element *c;
 714   c = add_set_enum_cmd ("endian", class_support,
 715                         endian_enum, &set_endian_string,
 716                         "Set endianness of target.",
 717                         &setlist);
 718   set_cmd_sfunc (c, set_endian);
 719   /* Don't use set_from_show - need to print both auto/manual and
 720      current setting. */
 721   add_cmd ("endian", class_support, show_endian,
 722            "Show the current byte-order", &showlist);
 723 }