gdb/arch-utils.c

   1 /* Dynamic architecture support for GDB, the GNU debugger.
   2
   3    Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software
   4    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., 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 #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                              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 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, void *readbuf,
  72                      const void *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_call_trampoline (CORE_ADDR pc, char *name)
 134 {
 135   return 0;
 136 }
 137
 138 int
 139 generic_in_solib_return_trampoline (CORE_ADDR pc, char *name)
 140 {
 141   return 0;
 142 }
 143
 144 int
 145 generic_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
 146 {
 147   return 0;
 148 }
 149
 150 void
 151 generic_remote_translate_xfer_address (struct gdbarch *gdbarch,
 152                                        struct regcache *regcache,
 153                                        CORE_ADDR gdb_addr, int gdb_len,
 154                                        CORE_ADDR * rem_addr, int *rem_len)
 155 {
 156   *rem_addr = gdb_addr;
 157   *rem_len = gdb_len;
 158 }
 159
 160 /* Helper functions for INNER_THAN */
 161
 162 int
 163 core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs)
 164 {
 165   return (lhs < rhs);
 166 }
 167
 168 int
 169 core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs)
 170 {
 171   return (lhs > rhs);
 172 }
 173
 174
 175 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
 176
 177 const struct floatformat *
 178 default_float_format (struct gdbarch *gdbarch)
 179 {
 180   int byte_order = gdbarch_byte_order (gdbarch);
 181   switch (byte_order)
 182     {
 183     case BFD_ENDIAN_BIG:
 184       return &floatformat_ieee_single_big;
 185     case BFD_ENDIAN_LITTLE:
 186       return &floatformat_ieee_single_little;
 187     default:
 188       internal_error (__FILE__, __LINE__,
 189                       "default_float_format: bad byte order");
 190     }
 191 }
 192
 193
 194 const struct floatformat *
 195 default_double_format (struct gdbarch *gdbarch)
 196 {
 197   int byte_order = gdbarch_byte_order (gdbarch);
 198   switch (byte_order)
 199     {
 200     case BFD_ENDIAN_BIG:
 201       return &floatformat_ieee_double_big;
 202     case BFD_ENDIAN_LITTLE:
 203       return &floatformat_ieee_double_little;
 204     default:
 205       internal_error (__FILE__, __LINE__,
 206                       "default_double_format: bad byte order");
 207     }
 208 }
 209
 210 /* Misc helper functions for targets. */
 211
 212 CORE_ADDR
 213 core_addr_identity (CORE_ADDR addr)
 214 {
 215   return addr;
 216 }
 217
 218 CORE_ADDR
 219 convert_from_func_ptr_addr_identity (struct gdbarch *gdbarch, CORE_ADDR addr,
 220                                      struct target_ops *targ)
 221 {
 222   return addr;
 223 }
 224
 225 int
 226 no_op_reg_to_regnum (int reg)
 227 {
 228   return reg;
 229 }
 230
 231 void
 232 default_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym)
 233 {
 234   return;
 235 }
 236
 237 void
 238 default_coff_make_msymbol_special (int val, struct minimal_symbol *msym)
 239 {
 240   return;
 241 }
 242
 243 int
 244 cannot_register_not (int regnum)
 245 {
 246   return 0;
 247 }
 248
 249 /* Legacy version of target_virtual_frame_pointer().  Assumes that
 250    there is an DEPRECATED_FP_REGNUM and that it is the same, cooked or
 251    raw.  */
 252
 253 void
 254 legacy_virtual_frame_pointer (CORE_ADDR pc,
 255                               int *frame_regnum,
 256                               LONGEST *frame_offset)
 257 {
 258   /* FIXME: cagney/2002-09-13: This code is used when identifying the
 259      frame pointer of the current PC.  It is assuming that a single
 260      register and an offset can determine this.  I think it should
 261      instead generate a byte code expression as that would work better
 262      with things like Dwarf2's CFI.  */
 263   if (DEPRECATED_FP_REGNUM >= 0 && DEPRECATED_FP_REGNUM < NUM_REGS)
 264     *frame_regnum = DEPRECATED_FP_REGNUM;
 265   else if (SP_REGNUM >= 0 && SP_REGNUM < NUM_REGS)
 266     *frame_regnum = SP_REGNUM;
 267   else
 268     /* Should this be an internal error?  I guess so, it is reflecting
 269        an architectural limitation in the current design.  */
 270     internal_error (__FILE__, __LINE__, "No virtual frame pointer available");
 271   *frame_offset = 0;
 272 }
 273
 274 /* Assume the world is sane, every register's virtual and real size
 275    is identical.  */
 276
 277 int
 278 generic_register_size (int regnum)
 279 {
 280   gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
 281   return TYPE_LENGTH (gdbarch_register_type (current_gdbarch, regnum));
 282 }
 283
 284 /* Assume all registers are adjacent.  */
 285
 286 int
 287 generic_register_byte (int regnum)
 288 {
 289   int byte;
 290   int i;
 291   gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
 292   byte = 0;
 293   for (i = 0; i < regnum; i++)
 294     {
 295       byte += generic_register_size (i);
 296     }
 297   return byte;
 298 }
 299
 300 \f
 301 int
 302 legacy_pc_in_sigtramp (CORE_ADDR pc, char *name)
 303 {
 304 #if defined (DEPRECATED_IN_SIGTRAMP)
 305   return DEPRECATED_IN_SIGTRAMP (pc, name);
 306 #else
 307   return name && strcmp ("_sigtramp", name) == 0;
 308 #endif
 309 }
 310
 311 int
 312 generic_convert_register_p (int regnum, struct type *type)
 313 {
 314   return 0;
 315 }
 316
 317 int
 318 default_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type)
 319 {
 320   if (DEPRECATED_REG_STRUCT_HAS_ADDR_P ()
 321       && DEPRECATED_REG_STRUCT_HAS_ADDR (processing_gcc_compilation, type))
 322     {
 323       CHECK_TYPEDEF (type);
 324
 325       return (TYPE_CODE (type) == TYPE_CODE_STRUCT
 326               || TYPE_CODE (type) == TYPE_CODE_UNION
 327               || TYPE_CODE (type) == TYPE_CODE_SET
 328               || TYPE_CODE (type) == TYPE_CODE_BITSTRING);
 329     }
 330
 331   return 0;
 332 }
 333
 334 \f
 335 /* Functions to manipulate the endianness of the target.  */
 336
 337 /* ``target_byte_order'' is only used when non- multi-arch.
 338    Multi-arch targets obtain the current byte order using the
 339    TARGET_BYTE_ORDER gdbarch method.
 340
 341    The choice of initial value is entirely arbitrary.  During startup,
 342    the function initialize_current_architecture() updates this value
 343    based on default byte-order information extracted from BFD.  */
 344 static int target_byte_order = BFD_ENDIAN_BIG;
 345 static int target_byte_order_auto = 1;
 346
 347 enum bfd_endian
 348 selected_byte_order (void)
 349 {
 350   if (target_byte_order_auto)
 351     return BFD_ENDIAN_UNKNOWN;
 352   else
 353     return target_byte_order;
 354 }
 355
 356 static const char endian_big[] = "big";
 357 static const char endian_little[] = "little";
 358 static const char endian_auto[] = "auto";
 359 static const char *endian_enum[] =
 360 {
 361   endian_big,
 362   endian_little,
 363   endian_auto,
 364   NULL,
 365 };
 366 static const char *set_endian_string;
 367
 368 /* Called by ``show endian''.  */
 369
 370 static void
 371 show_endian (char *args, int from_tty)
 372 {
 373   if (target_byte_order_auto)
 374     printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
 375                        (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
 376   else
 377     printf_unfiltered ("The target is assumed to be %s endian\n",
 378                        (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
 379 }
 380
 381 static void
 382 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
 383 {
 384   if (set_endian_string == endian_auto)
 385     {
 386       target_byte_order_auto = 1;
 387     }
 388   else if (set_endian_string == endian_little)
 389     {
 390       struct gdbarch_info info;
 391       target_byte_order_auto = 0;
 392       gdbarch_info_init (&info);
 393       info.byte_order = BFD_ENDIAN_LITTLE;
 394       if (! gdbarch_update_p (info))
 395         printf_unfiltered ("Little endian target not supported by GDB\n");
 396     }
 397   else if (set_endian_string == endian_big)
 398     {
 399       struct gdbarch_info info;
 400       target_byte_order_auto = 0;
 401       gdbarch_info_init (&info);
 402       info.byte_order = BFD_ENDIAN_BIG;
 403       if (! gdbarch_update_p (info))
 404         printf_unfiltered ("Big endian target not supported by GDB\n");
 405     }
 406   else
 407     internal_error (__FILE__, __LINE__,
 408                     "set_endian: bad value");
 409   show_endian (NULL, from_tty);
 410 }
 411
 412 /* Functions to manipulate the architecture of the target */
 413
 414 enum set_arch { set_arch_auto, set_arch_manual };
 415
 416 static int target_architecture_auto = 1;
 417
 418 static const char *set_architecture_string;
 419
 420 const char *
 421 selected_architecture_name (void)
 422 {
 423   if (target_architecture_auto)
 424     return NULL;
 425   else
 426     return set_architecture_string;
 427 }
 428
 429 /* Called if the user enters ``show architecture'' without an
 430    argument. */
 431
 432 static void
 433 show_architecture (char *args, int from_tty)
 434 {
 435   const char *arch;
 436   arch = TARGET_ARCHITECTURE->printable_name;
 437   if (target_architecture_auto)
 438     printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
 439   else
 440     printf_filtered ("The target architecture is assumed to be %s\n", arch);
 441 }
 442
 443
 444 /* Called if the user enters ``set architecture'' with or without an
 445    argument. */
 446
 447 static void
 448 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
 449 {
 450   if (strcmp (set_architecture_string, "auto") == 0)
 451     {
 452       target_architecture_auto = 1;
 453     }
 454   else
 455     {
 456       struct gdbarch_info info;
 457       gdbarch_info_init (&info);
 458       info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
 459       if (info.bfd_arch_info == NULL)
 460         internal_error (__FILE__, __LINE__,
 461                         "set_architecture: bfd_scan_arch failed");
 462       if (gdbarch_update_p (info))
 463         target_architecture_auto = 0;
 464       else
 465         printf_unfiltered ("Architecture `%s' not recognized.\n",
 466                            set_architecture_string);
 467     }
 468   show_architecture (NULL, from_tty);
 469 }
 470
 471 /* Try to select a global architecture that matches "info".  Return
 472    non-zero if the attempt succeds.  */
 473 int
 474 gdbarch_update_p (struct gdbarch_info info)
 475 {
 476   struct gdbarch *new_gdbarch = gdbarch_find_by_info (info);
 477
 478   /* If there no architecture by that name, reject the request.  */
 479   if (new_gdbarch == NULL)
 480     {
 481       if (gdbarch_debug)
 482         fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 483                             "Architecture not found\n");
 484       return 0;
 485     }
 486
 487   /* If it is the same old architecture, accept the request (but don't
 488      swap anything).  */
 489   if (new_gdbarch == current_gdbarch)
 490     {
 491       if (gdbarch_debug)
 492         fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 493                             "Architecture 0x%08lx (%s) unchanged\n",
 494                             (long) new_gdbarch,
 495                             gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
 496       return 1;
 497     }
 498
 499   /* It's a new architecture, swap it in.  */
 500   if (gdbarch_debug)
 501     fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 502                         "New architecture 0x%08lx (%s) selected\n",
 503                         (long) new_gdbarch,
 504                         gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
 505   deprecated_current_gdbarch_select_hack (new_gdbarch);
 506
 507   return 1;
 508 }
 509
 510 /* Return the architecture for ABFD.  If no suitable architecture
 511    could be find, return NULL.  */
 512
 513 struct gdbarch *
 514 gdbarch_from_bfd (bfd *abfd)
 515 {
 516   struct gdbarch *old_gdbarch = current_gdbarch;
 517   struct gdbarch *new_gdbarch;
 518   struct gdbarch_info info;
 519
 520   gdbarch_info_init (&info);
 521   info.abfd = abfd;
 522   return gdbarch_find_by_info (info);
 523 }
 524
 525 /* Set the dynamic target-system-dependent parameters (architecture,
 526    byte-order) using information found in the BFD */
 527
 528 void
 529 set_gdbarch_from_file (bfd *abfd)
 530 {
 531   struct gdbarch *gdbarch;
 532
 533   gdbarch = gdbarch_from_bfd (abfd);
 534   if (gdbarch == NULL)
 535     error ("Architecture of file not recognized.\n");
 536   deprecated_current_gdbarch_select_hack (gdbarch);
 537 }
 538
 539 /* Initialize the current architecture.  Update the ``set
 540    architecture'' command so that it specifies a list of valid
 541    architectures.  */
 542
 543 #ifdef DEFAULT_BFD_ARCH
 544 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
 545 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
 546 #else
 547 static const bfd_arch_info_type *default_bfd_arch;
 548 #endif
 549
 550 #ifdef DEFAULT_BFD_VEC
 551 extern const bfd_target DEFAULT_BFD_VEC;
 552 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
 553 #else
 554 static const bfd_target *default_bfd_vec;
 555 #endif
 556
 557 void
 558 initialize_current_architecture (void)
 559 {
 560   const char **arches = gdbarch_printable_names ();
 561
 562   /* determine a default architecture and byte order. */
 563   struct gdbarch_info info;
 564   gdbarch_info_init (&info);
 565
 566   /* Find a default architecture. */
 567   if (info.bfd_arch_info == NULL
 568       && default_bfd_arch != NULL)
 569     info.bfd_arch_info = default_bfd_arch;
 570   if (info.bfd_arch_info == NULL)
 571     {
 572       /* Choose the architecture by taking the first one
 573          alphabetically. */
 574       const char *chosen = arches[0];
 575       const char **arch;
 576       for (arch = arches; *arch != NULL; arch++)
 577         {
 578           if (strcmp (*arch, chosen) < 0)
 579             chosen = *arch;
 580         }
 581       if (chosen == NULL)
 582         internal_error (__FILE__, __LINE__,
 583                         "initialize_current_architecture: No arch");
 584       info.bfd_arch_info = bfd_scan_arch (chosen);
 585       if (info.bfd_arch_info == NULL)
 586         internal_error (__FILE__, __LINE__,
 587                         "initialize_current_architecture: Arch not found");
 588     }
 589
 590   /* Take several guesses at a byte order.  */
 591   if (info.byte_order == BFD_ENDIAN_UNKNOWN
 592       && default_bfd_vec != NULL)
 593     {
 594       /* Extract BFD's default vector's byte order. */
 595       switch (default_bfd_vec->byteorder)
 596         {
 597         case BFD_ENDIAN_BIG:
 598           info.byte_order = BFD_ENDIAN_BIG;
 599           break;
 600         case BFD_ENDIAN_LITTLE:
 601           info.byte_order = BFD_ENDIAN_LITTLE;
 602           break;
 603         default:
 604           break;
 605         }
 606     }
 607   if (info.byte_order == BFD_ENDIAN_UNKNOWN)
 608     {
 609       /* look for ``*el-*'' in the target name. */
 610       const char *chp;
 611       chp = strchr (target_name, '-');
 612       if (chp != NULL
 613           && chp - 2 >= target_name
 614           && strncmp (chp - 2, "el", 2) == 0)
 615         info.byte_order = BFD_ENDIAN_LITTLE;
 616     }
 617   if (info.byte_order == BFD_ENDIAN_UNKNOWN)
 618     {
 619       /* Wire it to big-endian!!! */
 620       info.byte_order = BFD_ENDIAN_BIG;
 621     }
 622
 623   if (! gdbarch_update_p (info))
 624     internal_error (__FILE__, __LINE__,
 625                     "initialize_current_architecture: Selection of initial architecture failed");
 626
 627   /* Create the ``set architecture'' command appending ``auto'' to the
 628      list of architectures. */
 629   {
 630     struct cmd_list_element *c;
 631     /* Append ``auto''. */
 632     int nr;
 633     for (nr = 0; arches[nr] != NULL; nr++);
 634     arches = xrealloc (arches, sizeof (char*) * (nr + 2));
 635     arches[nr + 0] = "auto";
 636     arches[nr + 1] = NULL;
 637     /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
 638        of ``const char *''.  We just happen to know that the casts are
 639        safe. */
 640     c = add_set_enum_cmd ("architecture", class_support,
 641                           arches, &set_architecture_string,
 642                           "Set architecture of target.",
 643                           &setlist);
 644     set_cmd_sfunc (c, set_architecture);
 645     add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
 646     /* Don't use set_from_show - need to print both auto/manual and
 647        current setting. */
 648     add_cmd ("architecture", class_support, show_architecture,
 649              "Show the current target architecture", &showlist);
 650   }
 651 }
 652
 653
 654 /* Initialize a gdbarch info to values that will be automatically
 655    overridden.  Note: Originally, this ``struct info'' was initialized
 656    using memset(0).  Unfortunately, that ran into problems, namely
 657    BFD_ENDIAN_BIG is zero.  An explicit initialization function that
 658    can explicitly set each field to a well defined value is used.  */
 659
 660 void
 661 gdbarch_info_init (struct gdbarch_info *info)
 662 {
 663   memset (info, 0, sizeof (struct gdbarch_info));
 664   info->byte_order = BFD_ENDIAN_UNKNOWN;
 665   info->osabi = GDB_OSABI_UNINITIALIZED;
 666 }
 667
 668 /* Similar to init, but this time fill in the blanks.  Information is
 669    obtained from the specified architecture, global "set ..." options,
 670    and explicitly initialized INFO fields.  */
 671
 672 void
 673 gdbarch_info_fill (struct gdbarch *gdbarch, struct gdbarch_info *info)
 674 {
 675   /* "(gdb) set architecture ...".  */
 676   if (info->bfd_arch_info == NULL
 677       && !target_architecture_auto
 678       && gdbarch != NULL)
 679     info->bfd_arch_info = gdbarch_bfd_arch_info (gdbarch);
 680   if (info->bfd_arch_info == NULL
 681       && info->abfd != NULL
 682       && bfd_get_arch (info->abfd) != bfd_arch_unknown
 683       && bfd_get_arch (info->abfd) != bfd_arch_obscure)
 684     info->bfd_arch_info = bfd_get_arch_info (info->abfd);
 685   if (info->bfd_arch_info == NULL
 686       && gdbarch != NULL)
 687     info->bfd_arch_info = gdbarch_bfd_arch_info (gdbarch);
 688
 689   /* "(gdb) set byte-order ...".  */
 690   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 691       && !target_byte_order_auto
 692       && gdbarch != NULL)
 693     info->byte_order = gdbarch_byte_order (gdbarch);
 694   /* From the INFO struct.  */
 695   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 696       && info->abfd != NULL)
 697     info->byte_order = (bfd_big_endian (info->abfd) ? BFD_ENDIAN_BIG
 698                        : bfd_little_endian (info->abfd) ? BFD_ENDIAN_LITTLE
 699                        : BFD_ENDIAN_UNKNOWN);
 700   /* From the current target.  */
 701   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 702       && gdbarch != NULL)
 703     info->byte_order = gdbarch_byte_order (gdbarch);
 704
 705   /* "(gdb) set osabi ...".  Handled by gdbarch_lookup_osabi.  */
 706   if (info->osabi == GDB_OSABI_UNINITIALIZED)
 707     info->osabi = gdbarch_lookup_osabi (info->abfd);
 708   if (info->osabi == GDB_OSABI_UNINITIALIZED
 709       && gdbarch != NULL)
 710     info->osabi = gdbarch_osabi (gdbarch);
 711
 712   /* Must have at least filled in the architecture.  */
 713   gdb_assert (info->bfd_arch_info != NULL);
 714 }
 715
 716 /* */
 717
 718 extern initialize_file_ftype _initialize_gdbarch_utils; /* -Wmissing-prototypes */
 719
 720 void
 721 _initialize_gdbarch_utils (void)
 722 {
 723   struct cmd_list_element *c;
 724   c = add_set_enum_cmd ("endian", class_support,
 725                         endian_enum, &set_endian_string,
 726                         "Set endianness of target.",
 727                         &setlist);
 728   set_cmd_sfunc (c, set_endian);
 729   /* Don't use set_from_show - need to print both auto/manual and
 730      current setting. */
 731   add_cmd ("endian", class_support, show_endian,
 732            "Show the current byte-order", &showlist);
 733 }