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 legacy_convert_register_p (int regnum, struct type *type)
 303 {
 304   return 0;
 305 }
 306
 307 void
 308 legacy_register_to_value (struct frame_info *frame, int regnum,
 309                           struct type *type, void *to)
 310 {
 311   internal_error (__FILE__, __LINE__, "legacy_register_to_value called");
 312 }
 313
 314 void
 315 legacy_value_to_register (struct frame_info *frame, int regnum,
 316                           struct type *type, const void *tmp)
 317 {
 318   internal_error (__FILE__, __LINE__, "legacy_value_to_register called");
 319 }
 320
 321 int
 322 default_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type)
 323 {
 324   if (DEPRECATED_REG_STRUCT_HAS_ADDR_P ()
 325       && DEPRECATED_REG_STRUCT_HAS_ADDR (processing_gcc_compilation, type))
 326     {
 327       CHECK_TYPEDEF (type);
 328
 329       return (TYPE_CODE (type) == TYPE_CODE_STRUCT
 330               || TYPE_CODE (type) == TYPE_CODE_UNION
 331               || TYPE_CODE (type) == TYPE_CODE_SET
 332               || TYPE_CODE (type) == TYPE_CODE_BITSTRING);
 333     }
 334
 335   return 0;
 336 }
 337
 338 \f
 339 /* Functions to manipulate the endianness of the target.  */
 340
 341 /* ``target_byte_order'' is only used when non- multi-arch.
 342    Multi-arch targets obtain the current byte order using the
 343    TARGET_BYTE_ORDER gdbarch method.
 344
 345    The choice of initial value is entirely arbitrary.  During startup,
 346    the function initialize_current_architecture() updates this value
 347    based on default byte-order information extracted from BFD.  */
 348 static int target_byte_order = BFD_ENDIAN_BIG;
 349 static int target_byte_order_auto = 1;
 350
 351 enum bfd_endian
 352 selected_byte_order (void)
 353 {
 354   if (target_byte_order_auto)
 355     return BFD_ENDIAN_UNKNOWN;
 356   else
 357     return target_byte_order;
 358 }
 359
 360 static const char endian_big[] = "big";
 361 static const char endian_little[] = "little";
 362 static const char endian_auto[] = "auto";
 363 static const char *endian_enum[] =
 364 {
 365   endian_big,
 366   endian_little,
 367   endian_auto,
 368   NULL,
 369 };
 370 static const char *set_endian_string;
 371
 372 /* Called by ``show endian''.  */
 373
 374 static void
 375 show_endian (char *args, int from_tty)
 376 {
 377   if (target_byte_order_auto)
 378     printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
 379                        (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
 380   else
 381     printf_unfiltered ("The target is assumed to be %s endian\n",
 382                        (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
 383 }
 384
 385 static void
 386 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
 387 {
 388   if (set_endian_string == endian_auto)
 389     {
 390       target_byte_order_auto = 1;
 391     }
 392   else if (set_endian_string == endian_little)
 393     {
 394       struct gdbarch_info info;
 395       target_byte_order_auto = 0;
 396       gdbarch_info_init (&info);
 397       info.byte_order = BFD_ENDIAN_LITTLE;
 398       if (! gdbarch_update_p (info))
 399         printf_unfiltered ("Little endian target not supported by GDB\n");
 400     }
 401   else if (set_endian_string == endian_big)
 402     {
 403       struct gdbarch_info info;
 404       target_byte_order_auto = 0;
 405       gdbarch_info_init (&info);
 406       info.byte_order = BFD_ENDIAN_BIG;
 407       if (! gdbarch_update_p (info))
 408         printf_unfiltered ("Big endian target not supported by GDB\n");
 409     }
 410   else
 411     internal_error (__FILE__, __LINE__,
 412                     "set_endian: bad value");
 413   show_endian (NULL, from_tty);
 414 }
 415
 416 /* Functions to manipulate the architecture of the target */
 417
 418 enum set_arch { set_arch_auto, set_arch_manual };
 419
 420 static int target_architecture_auto = 1;
 421
 422 static const char *set_architecture_string;
 423
 424 const char *
 425 selected_architecture_name (void)
 426 {
 427   if (target_architecture_auto)
 428     return NULL;
 429   else
 430     return set_architecture_string;
 431 }
 432
 433 /* Called if the user enters ``show architecture'' without an
 434    argument. */
 435
 436 static void
 437 show_architecture (char *args, int from_tty)
 438 {
 439   const char *arch;
 440   arch = TARGET_ARCHITECTURE->printable_name;
 441   if (target_architecture_auto)
 442     printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
 443   else
 444     printf_filtered ("The target architecture is assumed to be %s\n", arch);
 445 }
 446
 447
 448 /* Called if the user enters ``set architecture'' with or without an
 449    argument. */
 450
 451 static void
 452 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
 453 {
 454   if (strcmp (set_architecture_string, "auto") == 0)
 455     {
 456       target_architecture_auto = 1;
 457     }
 458   else
 459     {
 460       struct gdbarch_info info;
 461       gdbarch_info_init (&info);
 462       info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
 463       if (info.bfd_arch_info == NULL)
 464         internal_error (__FILE__, __LINE__,
 465                         "set_architecture: bfd_scan_arch failed");
 466       if (gdbarch_update_p (info))
 467         target_architecture_auto = 0;
 468       else
 469         printf_unfiltered ("Architecture `%s' not recognized.\n",
 470                            set_architecture_string);
 471     }
 472   show_architecture (NULL, from_tty);
 473 }
 474
 475 /* Try to select a global architecture that matches "info".  Return
 476    non-zero if the attempt succeds.  */
 477 int
 478 gdbarch_update_p (struct gdbarch_info info)
 479 {
 480   struct gdbarch *new_gdbarch = gdbarch_find_by_info (info);
 481
 482   /* If there no architecture by that name, reject the request.  */
 483   if (new_gdbarch == NULL)
 484     {
 485       if (gdbarch_debug)
 486         fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 487                             "Architecture not found\n");
 488       return 0;
 489     }
 490
 491   /* If it is the same old architecture, accept the request (but don't
 492      swap anything).  */
 493   if (new_gdbarch == current_gdbarch)
 494     {
 495       if (gdbarch_debug)
 496         fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 497                             "Architecture 0x%08lx (%s) unchanged\n",
 498                             (long) new_gdbarch,
 499                             gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
 500       return 1;
 501     }
 502
 503   /* It's a new architecture, swap it in.  */
 504   if (gdbarch_debug)
 505     fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 506                         "New architecture 0x%08lx (%s) selected\n",
 507                         (long) new_gdbarch,
 508                         gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
 509   deprecated_current_gdbarch_select_hack (new_gdbarch);
 510
 511   return 1;
 512 }
 513
 514 /* Return the architecture for ABFD.  If no suitable architecture
 515    could be find, return NULL.  */
 516
 517 struct gdbarch *
 518 gdbarch_from_bfd (bfd *abfd)
 519 {
 520   struct gdbarch *old_gdbarch = current_gdbarch;
 521   struct gdbarch *new_gdbarch;
 522   struct gdbarch_info info;
 523
 524   gdbarch_info_init (&info);
 525   info.abfd = abfd;
 526   return gdbarch_find_by_info (info);
 527 }
 528
 529 /* Set the dynamic target-system-dependent parameters (architecture,
 530    byte-order) using information found in the BFD */
 531
 532 void
 533 set_gdbarch_from_file (bfd *abfd)
 534 {
 535   struct gdbarch *gdbarch;
 536
 537   gdbarch = gdbarch_from_bfd (abfd);
 538   if (gdbarch == NULL)
 539     error ("Architecture of file not recognized.\n");
 540   deprecated_current_gdbarch_select_hack (gdbarch);
 541 }
 542
 543 /* Initialize the current architecture.  Update the ``set
 544    architecture'' command so that it specifies a list of valid
 545    architectures.  */
 546
 547 #ifdef DEFAULT_BFD_ARCH
 548 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
 549 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
 550 #else
 551 static const bfd_arch_info_type *default_bfd_arch;
 552 #endif
 553
 554 #ifdef DEFAULT_BFD_VEC
 555 extern const bfd_target DEFAULT_BFD_VEC;
 556 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
 557 #else
 558 static const bfd_target *default_bfd_vec;
 559 #endif
 560
 561 void
 562 initialize_current_architecture (void)
 563 {
 564   const char **arches = gdbarch_printable_names ();
 565
 566   /* determine a default architecture and byte order. */
 567   struct gdbarch_info info;
 568   gdbarch_info_init (&info);
 569
 570   /* Find a default architecture. */
 571   if (info.bfd_arch_info == NULL
 572       && default_bfd_arch != NULL)
 573     info.bfd_arch_info = default_bfd_arch;
 574   if (info.bfd_arch_info == NULL)
 575     {
 576       /* Choose the architecture by taking the first one
 577          alphabetically. */
 578       const char *chosen = arches[0];
 579       const char **arch;
 580       for (arch = arches; *arch != NULL; arch++)
 581         {
 582           if (strcmp (*arch, chosen) < 0)
 583             chosen = *arch;
 584         }
 585       if (chosen == NULL)
 586         internal_error (__FILE__, __LINE__,
 587                         "initialize_current_architecture: No arch");
 588       info.bfd_arch_info = bfd_scan_arch (chosen);
 589       if (info.bfd_arch_info == NULL)
 590         internal_error (__FILE__, __LINE__,
 591                         "initialize_current_architecture: Arch not found");
 592     }
 593
 594   /* Take several guesses at a byte order.  */
 595   if (info.byte_order == BFD_ENDIAN_UNKNOWN
 596       && default_bfd_vec != NULL)
 597     {
 598       /* Extract BFD's default vector's byte order. */
 599       switch (default_bfd_vec->byteorder)
 600         {
 601         case BFD_ENDIAN_BIG:
 602           info.byte_order = BFD_ENDIAN_BIG;
 603           break;
 604         case BFD_ENDIAN_LITTLE:
 605           info.byte_order = BFD_ENDIAN_LITTLE;
 606           break;
 607         default:
 608           break;
 609         }
 610     }
 611   if (info.byte_order == BFD_ENDIAN_UNKNOWN)
 612     {
 613       /* look for ``*el-*'' in the target name. */
 614       const char *chp;
 615       chp = strchr (target_name, '-');
 616       if (chp != NULL
 617           && chp - 2 >= target_name
 618           && strncmp (chp - 2, "el", 2) == 0)
 619         info.byte_order = BFD_ENDIAN_LITTLE;
 620     }
 621   if (info.byte_order == BFD_ENDIAN_UNKNOWN)
 622     {
 623       /* Wire it to big-endian!!! */
 624       info.byte_order = BFD_ENDIAN_BIG;
 625     }
 626
 627   if (! gdbarch_update_p (info))
 628     internal_error (__FILE__, __LINE__,
 629                     "initialize_current_architecture: Selection of initial architecture failed");
 630
 631   /* Create the ``set architecture'' command appending ``auto'' to the
 632      list of architectures. */
 633   {
 634     struct cmd_list_element *c;
 635     /* Append ``auto''. */
 636     int nr;
 637     for (nr = 0; arches[nr] != NULL; nr++);
 638     arches = xrealloc (arches, sizeof (char*) * (nr + 2));
 639     arches[nr + 0] = "auto";
 640     arches[nr + 1] = NULL;
 641     /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
 642        of ``const char *''.  We just happen to know that the casts are
 643        safe. */
 644     c = add_set_enum_cmd ("architecture", class_support,
 645                           arches, &set_architecture_string,
 646                           "Set architecture of target.",
 647                           &setlist);
 648     set_cmd_sfunc (c, set_architecture);
 649     add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
 650     /* Don't use set_from_show - need to print both auto/manual and
 651        current setting. */
 652     add_cmd ("architecture", class_support, show_architecture,
 653              "Show the current target architecture", &showlist);
 654   }
 655 }
 656
 657
 658 /* Initialize a gdbarch info to values that will be automatically
 659    overridden.  Note: Originally, this ``struct info'' was initialized
 660    using memset(0).  Unfortunately, that ran into problems, namely
 661    BFD_ENDIAN_BIG is zero.  An explicit initialization function that
 662    can explicitly set each field to a well defined value is used.  */
 663
 664 void
 665 gdbarch_info_init (struct gdbarch_info *info)
 666 {
 667   memset (info, 0, sizeof (struct gdbarch_info));
 668   info->byte_order = BFD_ENDIAN_UNKNOWN;
 669   info->osabi = GDB_OSABI_UNINITIALIZED;
 670 }
 671
 672 /* Similar to init, but this time fill in the blanks.  Information is
 673    obtained from the specified architecture, global "set ..." options,
 674    and explicitly initialized INFO fields.  */
 675
 676 void
 677 gdbarch_info_fill (struct gdbarch *gdbarch, struct gdbarch_info *info)
 678 {
 679   /* "(gdb) set architecture ...".  */
 680   if (info->bfd_arch_info == NULL
 681       && !target_architecture_auto
 682       && gdbarch != NULL)
 683     info->bfd_arch_info = gdbarch_bfd_arch_info (gdbarch);
 684   if (info->bfd_arch_info == NULL
 685       && info->abfd != NULL
 686       && bfd_get_arch (info->abfd) != bfd_arch_unknown
 687       && bfd_get_arch (info->abfd) != bfd_arch_obscure)
 688     info->bfd_arch_info = bfd_get_arch_info (info->abfd);
 689   if (info->bfd_arch_info == NULL
 690       && gdbarch != NULL)
 691     info->bfd_arch_info = gdbarch_bfd_arch_info (gdbarch);
 692
 693   /* "(gdb) set byte-order ...".  */
 694   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 695       && !target_byte_order_auto
 696       && gdbarch != NULL)
 697     info->byte_order = gdbarch_byte_order (gdbarch);
 698   /* From the INFO struct.  */
 699   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 700       && info->abfd != NULL)
 701     info->byte_order = (bfd_big_endian (info->abfd) ? BFD_ENDIAN_BIG
 702                        : bfd_little_endian (info->abfd) ? BFD_ENDIAN_LITTLE
 703                        : BFD_ENDIAN_UNKNOWN);
 704   /* From the current target.  */
 705   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 706       && gdbarch != NULL)
 707     info->byte_order = gdbarch_byte_order (gdbarch);
 708
 709   /* "(gdb) set osabi ...".  Handled by gdbarch_lookup_osabi.  */
 710   if (info->osabi == GDB_OSABI_UNINITIALIZED)
 711     info->osabi = gdbarch_lookup_osabi (info->abfd);
 712   if (info->osabi == GDB_OSABI_UNINITIALIZED
 713       && gdbarch != NULL)
 714     info->osabi = gdbarch_osabi (gdbarch);
 715
 716   /* Must have at least filled in the architecture.  */
 717   gdb_assert (info->bfd_arch_info != NULL);
 718 }
 719
 720 /* */
 721
 722 extern initialize_file_ftype _initialize_gdbarch_utils; /* -Wmissing-prototypes */
 723
 724 void
 725 _initialize_gdbarch_utils (void)
 726 {
 727   struct cmd_list_element *c;
 728   c = add_set_enum_cmd ("endian", class_support,
 729                         endian_enum, &set_endian_string,
 730                         "Set endianness of target.",
 731                         &setlist);
 732   set_cmd_sfunc (c, set_endian);
 733   /* Don't use set_from_show - need to print both auto/manual and
 734      current setting. */
 735   add_cmd ("endian", class_support, show_endian,
 736            "Show the current byte-order", &showlist);
 737 }