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 (DEPRECATED_REGISTER_CONVERTIBLE_P ()
 305           && DEPRECATED_REGISTER_CONVERTIBLE (regnum));
 306 }
 307
 308 void
 309 legacy_register_to_value (struct frame_info *frame, int regnum,
 310                           struct type *type, void *to)
 311 {
 312   char from[MAX_REGISTER_SIZE];
 313   get_frame_register (frame, regnum, from);
 314   DEPRECATED_REGISTER_CONVERT_TO_VIRTUAL (regnum, type, from, to);
 315 }
 316
 317 void
 318 legacy_value_to_register (struct frame_info *frame, int regnum,
 319                           struct type *type, const void *tmp)
 320 {
 321   char to[MAX_REGISTER_SIZE];
 322   char *from = alloca (TYPE_LENGTH (type));
 323   memcpy (from, from, TYPE_LENGTH (type));
 324   DEPRECATED_REGISTER_CONVERT_TO_RAW (type, regnum, from, to);
 325   put_frame_register (frame, regnum, to);
 326 }
 327
 328 int
 329 default_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type)
 330 {
 331   if (DEPRECATED_REG_STRUCT_HAS_ADDR_P ()
 332       && DEPRECATED_REG_STRUCT_HAS_ADDR (processing_gcc_compilation, type))
 333     {
 334       CHECK_TYPEDEF (type);
 335
 336       return (TYPE_CODE (type) == TYPE_CODE_STRUCT
 337               || TYPE_CODE (type) == TYPE_CODE_UNION
 338               || TYPE_CODE (type) == TYPE_CODE_SET
 339               || TYPE_CODE (type) == TYPE_CODE_BITSTRING);
 340     }
 341
 342   return 0;
 343 }
 344
 345 \f
 346 /* Functions to manipulate the endianness of the target.  */
 347
 348 /* ``target_byte_order'' is only used when non- multi-arch.
 349    Multi-arch targets obtain the current byte order using the
 350    TARGET_BYTE_ORDER gdbarch method.
 351
 352    The choice of initial value is entirely arbitrary.  During startup,
 353    the function initialize_current_architecture() updates this value
 354    based on default byte-order information extracted from BFD.  */
 355 static int target_byte_order = BFD_ENDIAN_BIG;
 356 static int target_byte_order_auto = 1;
 357
 358 enum bfd_endian
 359 selected_byte_order (void)
 360 {
 361   if (target_byte_order_auto)
 362     return BFD_ENDIAN_UNKNOWN;
 363   else
 364     return target_byte_order;
 365 }
 366
 367 static const char endian_big[] = "big";
 368 static const char endian_little[] = "little";
 369 static const char endian_auto[] = "auto";
 370 static const char *endian_enum[] =
 371 {
 372   endian_big,
 373   endian_little,
 374   endian_auto,
 375   NULL,
 376 };
 377 static const char *set_endian_string;
 378
 379 /* Called by ``show endian''.  */
 380
 381 static void
 382 show_endian (char *args, int from_tty)
 383 {
 384   if (target_byte_order_auto)
 385     printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
 386                        (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
 387   else
 388     printf_unfiltered ("The target is assumed to be %s endian\n",
 389                        (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
 390 }
 391
 392 static void
 393 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
 394 {
 395   if (set_endian_string == endian_auto)
 396     {
 397       target_byte_order_auto = 1;
 398     }
 399   else if (set_endian_string == endian_little)
 400     {
 401       struct gdbarch_info info;
 402       target_byte_order_auto = 0;
 403       gdbarch_info_init (&info);
 404       info.byte_order = BFD_ENDIAN_LITTLE;
 405       if (! gdbarch_update_p (info))
 406         printf_unfiltered ("Little endian target not supported by GDB\n");
 407     }
 408   else if (set_endian_string == endian_big)
 409     {
 410       struct gdbarch_info info;
 411       target_byte_order_auto = 0;
 412       gdbarch_info_init (&info);
 413       info.byte_order = BFD_ENDIAN_BIG;
 414       if (! gdbarch_update_p (info))
 415         printf_unfiltered ("Big endian target not supported by GDB\n");
 416     }
 417   else
 418     internal_error (__FILE__, __LINE__,
 419                     "set_endian: bad value");
 420   show_endian (NULL, from_tty);
 421 }
 422
 423 /* Functions to manipulate the architecture of the target */
 424
 425 enum set_arch { set_arch_auto, set_arch_manual };
 426
 427 static int target_architecture_auto = 1;
 428
 429 static const char *set_architecture_string;
 430
 431 const char *
 432 selected_architecture_name (void)
 433 {
 434   if (target_architecture_auto)
 435     return NULL;
 436   else
 437     return set_architecture_string;
 438 }
 439
 440 /* Called if the user enters ``show architecture'' without an
 441    argument. */
 442
 443 static void
 444 show_architecture (char *args, int from_tty)
 445 {
 446   const char *arch;
 447   arch = TARGET_ARCHITECTURE->printable_name;
 448   if (target_architecture_auto)
 449     printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
 450   else
 451     printf_filtered ("The target architecture is assumed to be %s\n", arch);
 452 }
 453
 454
 455 /* Called if the user enters ``set architecture'' with or without an
 456    argument. */
 457
 458 static void
 459 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
 460 {
 461   if (strcmp (set_architecture_string, "auto") == 0)
 462     {
 463       target_architecture_auto = 1;
 464     }
 465   else
 466     {
 467       struct gdbarch_info info;
 468       gdbarch_info_init (&info);
 469       info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
 470       if (info.bfd_arch_info == NULL)
 471         internal_error (__FILE__, __LINE__,
 472                         "set_architecture: bfd_scan_arch failed");
 473       if (gdbarch_update_p (info))
 474         target_architecture_auto = 0;
 475       else
 476         printf_unfiltered ("Architecture `%s' not recognized.\n",
 477                            set_architecture_string);
 478     }
 479   show_architecture (NULL, from_tty);
 480 }
 481
 482 /* Try to select a global architecture that matches "info".  Return
 483    non-zero if the attempt succeds.  */
 484 int
 485 gdbarch_update_p (struct gdbarch_info info)
 486 {
 487   struct gdbarch *new_gdbarch = gdbarch_find_by_info (info);
 488
 489   /* If there no architecture by that name, reject the request.  */
 490   if (new_gdbarch == NULL)
 491     {
 492       if (gdbarch_debug)
 493         fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 494                             "Architecture not found\n");
 495       return 0;
 496     }
 497
 498   /* If it is the same old architecture, accept the request (but don't
 499      swap anything).  */
 500   if (new_gdbarch == current_gdbarch)
 501     {
 502       if (gdbarch_debug)
 503         fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 504                             "Architecture 0x%08lx (%s) unchanged\n",
 505                             (long) new_gdbarch,
 506                             gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
 507       return 1;
 508     }
 509
 510   /* It's a new architecture, swap it in.  */
 511   if (gdbarch_debug)
 512     fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 513                         "New architecture 0x%08lx (%s) selected\n",
 514                         (long) new_gdbarch,
 515                         gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
 516   deprecated_current_gdbarch_select_hack (new_gdbarch);
 517
 518   return 1;
 519 }
 520
 521 /* Return the architecture for ABFD.  If no suitable architecture
 522    could be find, return NULL.  */
 523
 524 struct gdbarch *
 525 gdbarch_from_bfd (bfd *abfd)
 526 {
 527   struct gdbarch *old_gdbarch = current_gdbarch;
 528   struct gdbarch *new_gdbarch;
 529   struct gdbarch_info info;
 530
 531   gdbarch_info_init (&info);
 532   info.abfd = abfd;
 533   return gdbarch_find_by_info (info);
 534 }
 535
 536 /* Set the dynamic target-system-dependent parameters (architecture,
 537    byte-order) using information found in the BFD */
 538
 539 void
 540 set_gdbarch_from_file (bfd *abfd)
 541 {
 542   struct gdbarch *gdbarch;
 543
 544   gdbarch = gdbarch_from_bfd (abfd);
 545   if (gdbarch == NULL)
 546     error ("Architecture of file not recognized.\n");
 547   deprecated_current_gdbarch_select_hack (gdbarch);
 548 }
 549
 550 /* Initialize the current architecture.  Update the ``set
 551    architecture'' command so that it specifies a list of valid
 552    architectures.  */
 553
 554 #ifdef DEFAULT_BFD_ARCH
 555 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
 556 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
 557 #else
 558 static const bfd_arch_info_type *default_bfd_arch;
 559 #endif
 560
 561 #ifdef DEFAULT_BFD_VEC
 562 extern const bfd_target DEFAULT_BFD_VEC;
 563 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
 564 #else
 565 static const bfd_target *default_bfd_vec;
 566 #endif
 567
 568 void
 569 initialize_current_architecture (void)
 570 {
 571   const char **arches = gdbarch_printable_names ();
 572
 573   /* determine a default architecture and byte order. */
 574   struct gdbarch_info info;
 575   gdbarch_info_init (&info);
 576
 577   /* Find a default architecture. */
 578   if (info.bfd_arch_info == NULL
 579       && default_bfd_arch != NULL)
 580     info.bfd_arch_info = default_bfd_arch;
 581   if (info.bfd_arch_info == NULL)
 582     {
 583       /* Choose the architecture by taking the first one
 584          alphabetically. */
 585       const char *chosen = arches[0];
 586       const char **arch;
 587       for (arch = arches; *arch != NULL; arch++)
 588         {
 589           if (strcmp (*arch, chosen) < 0)
 590             chosen = *arch;
 591         }
 592       if (chosen == NULL)
 593         internal_error (__FILE__, __LINE__,
 594                         "initialize_current_architecture: No arch");
 595       info.bfd_arch_info = bfd_scan_arch (chosen);
 596       if (info.bfd_arch_info == NULL)
 597         internal_error (__FILE__, __LINE__,
 598                         "initialize_current_architecture: Arch not found");
 599     }
 600
 601   /* Take several guesses at a byte order.  */
 602   if (info.byte_order == BFD_ENDIAN_UNKNOWN
 603       && default_bfd_vec != NULL)
 604     {
 605       /* Extract BFD's default vector's byte order. */
 606       switch (default_bfd_vec->byteorder)
 607         {
 608         case BFD_ENDIAN_BIG:
 609           info.byte_order = BFD_ENDIAN_BIG;
 610           break;
 611         case BFD_ENDIAN_LITTLE:
 612           info.byte_order = BFD_ENDIAN_LITTLE;
 613           break;
 614         default:
 615           break;
 616         }
 617     }
 618   if (info.byte_order == BFD_ENDIAN_UNKNOWN)
 619     {
 620       /* look for ``*el-*'' in the target name. */
 621       const char *chp;
 622       chp = strchr (target_name, '-');
 623       if (chp != NULL
 624           && chp - 2 >= target_name
 625           && strncmp (chp - 2, "el", 2) == 0)
 626         info.byte_order = BFD_ENDIAN_LITTLE;
 627     }
 628   if (info.byte_order == BFD_ENDIAN_UNKNOWN)
 629     {
 630       /* Wire it to big-endian!!! */
 631       info.byte_order = BFD_ENDIAN_BIG;
 632     }
 633
 634   if (! gdbarch_update_p (info))
 635     internal_error (__FILE__, __LINE__,
 636                     "initialize_current_architecture: Selection of initial architecture failed");
 637
 638   /* Create the ``set architecture'' command appending ``auto'' to the
 639      list of architectures. */
 640   {
 641     struct cmd_list_element *c;
 642     /* Append ``auto''. */
 643     int nr;
 644     for (nr = 0; arches[nr] != NULL; nr++);
 645     arches = xrealloc (arches, sizeof (char*) * (nr + 2));
 646     arches[nr + 0] = "auto";
 647     arches[nr + 1] = NULL;
 648     /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
 649        of ``const char *''.  We just happen to know that the casts are
 650        safe. */
 651     c = add_set_enum_cmd ("architecture", class_support,
 652                           arches, &set_architecture_string,
 653                           "Set architecture of target.",
 654                           &setlist);
 655     set_cmd_sfunc (c, set_architecture);
 656     add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
 657     /* Don't use set_from_show - need to print both auto/manual and
 658        current setting. */
 659     add_cmd ("architecture", class_support, show_architecture,
 660              "Show the current target architecture", &showlist);
 661   }
 662 }
 663
 664
 665 /* Initialize a gdbarch info to values that will be automatically
 666    overridden.  Note: Originally, this ``struct info'' was initialized
 667    using memset(0).  Unfortunately, that ran into problems, namely
 668    BFD_ENDIAN_BIG is zero.  An explicit initialization function that
 669    can explicitly set each field to a well defined value is used.  */
 670
 671 void
 672 gdbarch_info_init (struct gdbarch_info *info)
 673 {
 674   memset (info, 0, sizeof (struct gdbarch_info));
 675   info->byte_order = BFD_ENDIAN_UNKNOWN;
 676   info->osabi = GDB_OSABI_UNINITIALIZED;
 677 }
 678
 679 /* Similar to init, but this time fill in the blanks.  Information is
 680    obtained from the specified architecture, global "set ..." options,
 681    and explicitly initialized INFO fields.  */
 682
 683 void
 684 gdbarch_info_fill (struct gdbarch *gdbarch, struct gdbarch_info *info)
 685 {
 686   /* "(gdb) set architecture ...".  */
 687   if (info->bfd_arch_info == NULL
 688       && !target_architecture_auto
 689       && gdbarch != NULL)
 690     info->bfd_arch_info = gdbarch_bfd_arch_info (gdbarch);
 691   if (info->bfd_arch_info == NULL
 692       && info->abfd != NULL
 693       && bfd_get_arch (info->abfd) != bfd_arch_unknown
 694       && bfd_get_arch (info->abfd) != bfd_arch_obscure)
 695     info->bfd_arch_info = bfd_get_arch_info (info->abfd);
 696   if (info->bfd_arch_info == NULL
 697       && gdbarch != NULL)
 698     info->bfd_arch_info = gdbarch_bfd_arch_info (gdbarch);
 699
 700   /* "(gdb) set byte-order ...".  */
 701   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 702       && !target_byte_order_auto
 703       && gdbarch != NULL)
 704     info->byte_order = gdbarch_byte_order (gdbarch);
 705   /* From the INFO struct.  */
 706   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 707       && info->abfd != NULL)
 708     info->byte_order = (bfd_big_endian (info->abfd) ? BFD_ENDIAN_BIG
 709                        : bfd_little_endian (info->abfd) ? BFD_ENDIAN_LITTLE
 710                        : BFD_ENDIAN_UNKNOWN);
 711   /* From the current target.  */
 712   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 713       && gdbarch != NULL)
 714     info->byte_order = gdbarch_byte_order (gdbarch);
 715
 716   /* "(gdb) set osabi ...".  Handled by gdbarch_lookup_osabi.  */
 717   if (info->osabi == GDB_OSABI_UNINITIALIZED)
 718     info->osabi = gdbarch_lookup_osabi (info->abfd);
 719   if (info->osabi == GDB_OSABI_UNINITIALIZED
 720       && gdbarch != NULL)
 721     info->osabi = gdbarch_osabi (gdbarch);
 722
 723   /* Must have at least filled in the architecture.  */
 724   gdb_assert (info->bfd_arch_info != NULL);
 725 }
 726
 727 /* */
 728
 729 extern initialize_file_ftype _initialize_gdbarch_utils; /* -Wmissing-prototypes */
 730
 731 void
 732 _initialize_gdbarch_utils (void)
 733 {
 734   struct cmd_list_element *c;
 735   c = add_set_enum_cmd ("endian", class_support,
 736                         endian_enum, &set_endian_string,
 737                         "Set endianness of target.",
 738                         &setlist);
 739   set_cmd_sfunc (c, set_endian);
 740   /* Don't use set_from_show - need to print both auto/manual and
 741      current setting. */
 742   add_cmd ("endian", class_support, show_endian,
 743            "Show the current byte-order", &showlist);
 744 }