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 #if defined (CALL_DUMMY)
 124 LONGEST legacy_call_dummy_words[] = CALL_DUMMY;
 125 #else
 126 LONGEST legacy_call_dummy_words[1];
 127 #endif
 128 int legacy_sizeof_call_dummy_words = sizeof (legacy_call_dummy_words);
 129
 130 void
 131 generic_remote_translate_xfer_address (struct gdbarch *gdbarch,
 132                                        struct regcache *regcache,
 133                                        CORE_ADDR gdb_addr, int gdb_len,
 134                                        CORE_ADDR * rem_addr, int *rem_len)
 135 {
 136   *rem_addr = gdb_addr;
 137   *rem_len = gdb_len;
 138 }
 139
 140 /* Helper functions for INNER_THAN */
 141
 142 int
 143 core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs)
 144 {
 145   return (lhs < rhs);
 146 }
 147
 148 int
 149 core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs)
 150 {
 151   return (lhs > rhs);
 152 }
 153
 154
 155 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
 156
 157 const struct floatformat *
 158 default_float_format (struct gdbarch *gdbarch)
 159 {
 160   int byte_order = gdbarch_byte_order (gdbarch);
 161   switch (byte_order)
 162     {
 163     case BFD_ENDIAN_BIG:
 164       return &floatformat_ieee_single_big;
 165     case BFD_ENDIAN_LITTLE:
 166       return &floatformat_ieee_single_little;
 167     default:
 168       internal_error (__FILE__, __LINE__,
 169                       "default_float_format: bad byte order");
 170     }
 171 }
 172
 173
 174 const struct floatformat *
 175 default_double_format (struct gdbarch *gdbarch)
 176 {
 177   int byte_order = gdbarch_byte_order (gdbarch);
 178   switch (byte_order)
 179     {
 180     case BFD_ENDIAN_BIG:
 181       return &floatformat_ieee_double_big;
 182     case BFD_ENDIAN_LITTLE:
 183       return &floatformat_ieee_double_little;
 184     default:
 185       internal_error (__FILE__, __LINE__,
 186                       "default_double_format: bad byte order");
 187     }
 188 }
 189
 190 /* Misc helper functions for targets. */
 191
 192 CORE_ADDR
 193 core_addr_identity (CORE_ADDR addr)
 194 {
 195   return addr;
 196 }
 197
 198 CORE_ADDR
 199 convert_from_func_ptr_addr_identity (struct gdbarch *gdbarch, CORE_ADDR addr,
 200                                      struct target_ops *targ)
 201 {
 202   return addr;
 203 }
 204
 205 int
 206 no_op_reg_to_regnum (int reg)
 207 {
 208   return reg;
 209 }
 210
 211 CORE_ADDR
 212 deprecated_init_frame_pc_default (int fromleaf, struct frame_info *prev)
 213 {
 214   if (fromleaf && DEPRECATED_SAVED_PC_AFTER_CALL_P ())
 215     return DEPRECATED_SAVED_PC_AFTER_CALL (get_next_frame (prev));
 216   else if (get_next_frame (prev) != NULL)
 217     return DEPRECATED_FRAME_SAVED_PC (get_next_frame (prev));
 218   else
 219     return read_pc ();
 220 }
 221
 222 void
 223 default_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym)
 224 {
 225   return;
 226 }
 227
 228 void
 229 default_coff_make_msymbol_special (int val, struct minimal_symbol *msym)
 230 {
 231   return;
 232 }
 233
 234 int
 235 cannot_register_not (int regnum)
 236 {
 237   return 0;
 238 }
 239
 240 /* Legacy version of target_virtual_frame_pointer().  Assumes that
 241    there is an DEPRECATED_FP_REGNUM and that it is the same, cooked or
 242    raw.  */
 243
 244 void
 245 legacy_virtual_frame_pointer (CORE_ADDR pc,
 246                               int *frame_regnum,
 247                               LONGEST *frame_offset)
 248 {
 249   /* FIXME: cagney/2002-09-13: This code is used when identifying the
 250      frame pointer of the current PC.  It is assuming that a single
 251      register and an offset can determine this.  I think it should
 252      instead generate a byte code expression as that would work better
 253      with things like Dwarf2's CFI.  */
 254   if (DEPRECATED_FP_REGNUM >= 0 && DEPRECATED_FP_REGNUM < NUM_REGS)
 255     *frame_regnum = DEPRECATED_FP_REGNUM;
 256   else if (SP_REGNUM >= 0 && SP_REGNUM < NUM_REGS)
 257     *frame_regnum = SP_REGNUM;
 258   else
 259     /* Should this be an internal error?  I guess so, it is reflecting
 260        an architectural limitation in the current design.  */
 261     internal_error (__FILE__, __LINE__, "No virtual frame pointer available");
 262   *frame_offset = 0;
 263 }
 264
 265 /* Assume the world is sane, every register's virtual and real size
 266    is identical.  */
 267
 268 int
 269 generic_register_size (int regnum)
 270 {
 271   gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
 272   if (gdbarch_register_type_p (current_gdbarch))
 273     return TYPE_LENGTH (gdbarch_register_type (current_gdbarch, regnum));
 274   else
 275     /* FIXME: cagney/2003-03-01: Once all architectures implement
 276        gdbarch_register_type(), this entire function can go away.  It
 277        is made obsolete by register_size().  */
 278     return TYPE_LENGTH (DEPRECATED_REGISTER_VIRTUAL_TYPE (regnum)); /* OK */
 279 }
 280
 281 /* Assume all registers are adjacent.  */
 282
 283 int
 284 generic_register_byte (int regnum)
 285 {
 286   int byte;
 287   int i;
 288   gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
 289   byte = 0;
 290   for (i = 0; i < regnum; i++)
 291     {
 292       byte += generic_register_size (i);
 293     }
 294   return byte;
 295 }
 296
 297 \f
 298 int
 299 legacy_pc_in_sigtramp (CORE_ADDR pc, char *name)
 300 {
 301 #if !defined (DEPRECATED_IN_SIGTRAMP)
 302   if (DEPRECATED_SIGTRAMP_START_P ())
 303     return ((pc) >= DEPRECATED_SIGTRAMP_START (pc)
 304             && (pc) < DEPRECATED_SIGTRAMP_END (pc));
 305   else
 306     return name && strcmp ("_sigtramp", name) == 0;
 307 #else
 308   return DEPRECATED_IN_SIGTRAMP (pc, name);
 309 #endif
 310 }
 311
 312 int
 313 legacy_convert_register_p (int regnum, struct type *type)
 314 {
 315   return (DEPRECATED_REGISTER_CONVERTIBLE_P ()
 316           && DEPRECATED_REGISTER_CONVERTIBLE (regnum));
 317 }
 318
 319 void
 320 legacy_register_to_value (struct frame_info *frame, int regnum,
 321                           struct type *type, void *to)
 322 {
 323   char from[MAX_REGISTER_SIZE];
 324   get_frame_register (frame, regnum, from);
 325   DEPRECATED_REGISTER_CONVERT_TO_VIRTUAL (regnum, type, from, to);
 326 }
 327
 328 void
 329 legacy_value_to_register (struct frame_info *frame, int regnum,
 330                           struct type *type, const void *tmp)
 331 {
 332   char to[MAX_REGISTER_SIZE];
 333   char *from = alloca (TYPE_LENGTH (type));
 334   memcpy (from, from, TYPE_LENGTH (type));
 335   DEPRECATED_REGISTER_CONVERT_TO_RAW (type, regnum, from, to);
 336   put_frame_register (frame, regnum, to);
 337 }
 338
 339 int
 340 default_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type)
 341 {
 342   if (DEPRECATED_REG_STRUCT_HAS_ADDR_P ()
 343       && DEPRECATED_REG_STRUCT_HAS_ADDR (processing_gcc_compilation, type))
 344     {
 345       CHECK_TYPEDEF (type);
 346
 347       return (TYPE_CODE (type) == TYPE_CODE_STRUCT
 348               || TYPE_CODE (type) == TYPE_CODE_UNION
 349               || TYPE_CODE (type) == TYPE_CODE_SET
 350               || TYPE_CODE (type) == TYPE_CODE_BITSTRING);
 351     }
 352
 353   return 0;
 354 }
 355
 356 \f
 357 /* Functions to manipulate the endianness of the target.  */
 358
 359 /* ``target_byte_order'' is only used when non- multi-arch.
 360    Multi-arch targets obtain the current byte order using the
 361    TARGET_BYTE_ORDER gdbarch method.
 362
 363    The choice of initial value is entirely arbitrary.  During startup,
 364    the function initialize_current_architecture() updates this value
 365    based on default byte-order information extracted from BFD.  */
 366 static int target_byte_order = BFD_ENDIAN_BIG;
 367 static int target_byte_order_auto = 1;
 368
 369 enum bfd_endian
 370 selected_byte_order (void)
 371 {
 372   if (target_byte_order_auto)
 373     return BFD_ENDIAN_UNKNOWN;
 374   else
 375     return target_byte_order;
 376 }
 377
 378 static const char endian_big[] = "big";
 379 static const char endian_little[] = "little";
 380 static const char endian_auto[] = "auto";
 381 static const char *endian_enum[] =
 382 {
 383   endian_big,
 384   endian_little,
 385   endian_auto,
 386   NULL,
 387 };
 388 static const char *set_endian_string;
 389
 390 /* Called by ``show endian''.  */
 391
 392 static void
 393 show_endian (char *args, int from_tty)
 394 {
 395   if (target_byte_order_auto)
 396     printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
 397                        (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
 398   else
 399     printf_unfiltered ("The target is assumed to be %s endian\n",
 400                        (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
 401 }
 402
 403 static void
 404 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
 405 {
 406   if (set_endian_string == endian_auto)
 407     {
 408       target_byte_order_auto = 1;
 409     }
 410   else if (set_endian_string == endian_little)
 411     {
 412       struct gdbarch_info info;
 413       target_byte_order_auto = 0;
 414       gdbarch_info_init (&info);
 415       info.byte_order = BFD_ENDIAN_LITTLE;
 416       if (! gdbarch_update_p (info))
 417         printf_unfiltered ("Little endian target not supported by GDB\n");
 418     }
 419   else if (set_endian_string == endian_big)
 420     {
 421       struct gdbarch_info info;
 422       target_byte_order_auto = 0;
 423       gdbarch_info_init (&info);
 424       info.byte_order = BFD_ENDIAN_BIG;
 425       if (! gdbarch_update_p (info))
 426         printf_unfiltered ("Big endian target not supported by GDB\n");
 427     }
 428   else
 429     internal_error (__FILE__, __LINE__,
 430                     "set_endian: bad value");
 431   show_endian (NULL, from_tty);
 432 }
 433
 434 /* Functions to manipulate the architecture of the target */
 435
 436 enum set_arch { set_arch_auto, set_arch_manual };
 437
 438 static int target_architecture_auto = 1;
 439
 440 static const char *set_architecture_string;
 441
 442 const char *
 443 selected_architecture_name (void)
 444 {
 445   if (target_architecture_auto)
 446     return NULL;
 447   else
 448     return set_architecture_string;
 449 }
 450
 451 /* Called if the user enters ``show architecture'' without an
 452    argument. */
 453
 454 static void
 455 show_architecture (char *args, int from_tty)
 456 {
 457   const char *arch;
 458   arch = TARGET_ARCHITECTURE->printable_name;
 459   if (target_architecture_auto)
 460     printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
 461   else
 462     printf_filtered ("The target architecture is assumed to be %s\n", arch);
 463 }
 464
 465
 466 /* Called if the user enters ``set architecture'' with or without an
 467    argument. */
 468
 469 static void
 470 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
 471 {
 472   if (strcmp (set_architecture_string, "auto") == 0)
 473     {
 474       target_architecture_auto = 1;
 475     }
 476   else
 477     {
 478       struct gdbarch_info info;
 479       gdbarch_info_init (&info);
 480       info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
 481       if (info.bfd_arch_info == NULL)
 482         internal_error (__FILE__, __LINE__,
 483                         "set_architecture: bfd_scan_arch failed");
 484       if (gdbarch_update_p (info))
 485         target_architecture_auto = 0;
 486       else
 487         printf_unfiltered ("Architecture `%s' not recognized.\n",
 488                            set_architecture_string);
 489     }
 490   show_architecture (NULL, from_tty);
 491 }
 492
 493 /* Try to select a global architecture that matches "info".  Return
 494    non-zero if the attempt succeds.  */
 495 int
 496 gdbarch_update_p (struct gdbarch_info info)
 497 {
 498   struct gdbarch *new_gdbarch = gdbarch_find_by_info (info);
 499
 500   /* If there no architecture by that name, reject the request.  */
 501   if (new_gdbarch == NULL)
 502     {
 503       if (gdbarch_debug)
 504         fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 505                             "Architecture not found\n");
 506       return 0;
 507     }
 508
 509   /* If it is the same old architecture, accept the request (but don't
 510      swap anything).  */
 511   if (new_gdbarch == current_gdbarch)
 512     {
 513       if (gdbarch_debug)
 514         fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 515                             "Architecture 0x%08lx (%s) unchanged\n",
 516                             (long) new_gdbarch,
 517                             gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
 518       return 1;
 519     }
 520
 521   /* It's a new architecture, swap it in.  */
 522   if (gdbarch_debug)
 523     fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 524                         "New architecture 0x%08lx (%s) selected\n",
 525                         (long) new_gdbarch,
 526                         gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
 527   deprecated_current_gdbarch_select_hack (new_gdbarch);
 528
 529   return 1;
 530 }
 531
 532 /* Return the architecture for ABFD.  If no suitable architecture
 533    could be find, return NULL.  */
 534
 535 struct gdbarch *
 536 gdbarch_from_bfd (bfd *abfd)
 537 {
 538   struct gdbarch *old_gdbarch = current_gdbarch;
 539   struct gdbarch *new_gdbarch;
 540   struct gdbarch_info info;
 541
 542   gdbarch_info_init (&info);
 543   info.abfd = abfd;
 544   return gdbarch_find_by_info (info);
 545 }
 546
 547 /* Set the dynamic target-system-dependent parameters (architecture,
 548    byte-order) using information found in the BFD */
 549
 550 void
 551 set_gdbarch_from_file (bfd *abfd)
 552 {
 553   struct gdbarch *gdbarch;
 554
 555   gdbarch = gdbarch_from_bfd (abfd);
 556   if (gdbarch == NULL)
 557     error ("Architecture of file not recognized.\n");
 558   deprecated_current_gdbarch_select_hack (gdbarch);
 559 }
 560
 561 /* Initialize the current architecture.  Update the ``set
 562    architecture'' command so that it specifies a list of valid
 563    architectures.  */
 564
 565 #ifdef DEFAULT_BFD_ARCH
 566 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
 567 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
 568 #else
 569 static const bfd_arch_info_type *default_bfd_arch;
 570 #endif
 571
 572 #ifdef DEFAULT_BFD_VEC
 573 extern const bfd_target DEFAULT_BFD_VEC;
 574 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
 575 #else
 576 static const bfd_target *default_bfd_vec;
 577 #endif
 578
 579 void
 580 initialize_current_architecture (void)
 581 {
 582   const char **arches = gdbarch_printable_names ();
 583
 584   /* determine a default architecture and byte order. */
 585   struct gdbarch_info info;
 586   gdbarch_info_init (&info);
 587
 588   /* Find a default architecture. */
 589   if (info.bfd_arch_info == NULL
 590       && default_bfd_arch != NULL)
 591     info.bfd_arch_info = default_bfd_arch;
 592   if (info.bfd_arch_info == NULL)
 593     {
 594       /* Choose the architecture by taking the first one
 595          alphabetically. */
 596       const char *chosen = arches[0];
 597       const char **arch;
 598       for (arch = arches; *arch != NULL; arch++)
 599         {
 600           if (strcmp (*arch, chosen) < 0)
 601             chosen = *arch;
 602         }
 603       if (chosen == NULL)
 604         internal_error (__FILE__, __LINE__,
 605                         "initialize_current_architecture: No arch");
 606       info.bfd_arch_info = bfd_scan_arch (chosen);
 607       if (info.bfd_arch_info == NULL)
 608         internal_error (__FILE__, __LINE__,
 609                         "initialize_current_architecture: Arch not found");
 610     }
 611
 612   /* Take several guesses at a byte order.  */
 613   if (info.byte_order == BFD_ENDIAN_UNKNOWN
 614       && default_bfd_vec != NULL)
 615     {
 616       /* Extract BFD's default vector's byte order. */
 617       switch (default_bfd_vec->byteorder)
 618         {
 619         case BFD_ENDIAN_BIG:
 620           info.byte_order = BFD_ENDIAN_BIG;
 621           break;
 622         case BFD_ENDIAN_LITTLE:
 623           info.byte_order = BFD_ENDIAN_LITTLE;
 624           break;
 625         default:
 626           break;
 627         }
 628     }
 629   if (info.byte_order == BFD_ENDIAN_UNKNOWN)
 630     {
 631       /* look for ``*el-*'' in the target name. */
 632       const char *chp;
 633       chp = strchr (target_name, '-');
 634       if (chp != NULL
 635           && chp - 2 >= target_name
 636           && strncmp (chp - 2, "el", 2) == 0)
 637         info.byte_order = BFD_ENDIAN_LITTLE;
 638     }
 639   if (info.byte_order == BFD_ENDIAN_UNKNOWN)
 640     {
 641       /* Wire it to big-endian!!! */
 642       info.byte_order = BFD_ENDIAN_BIG;
 643     }
 644
 645   if (! gdbarch_update_p (info))
 646     internal_error (__FILE__, __LINE__,
 647                     "initialize_current_architecture: Selection of initial architecture failed");
 648
 649   /* Create the ``set architecture'' command appending ``auto'' to the
 650      list of architectures. */
 651   {
 652     struct cmd_list_element *c;
 653     /* Append ``auto''. */
 654     int nr;
 655     for (nr = 0; arches[nr] != NULL; nr++);
 656     arches = xrealloc (arches, sizeof (char*) * (nr + 2));
 657     arches[nr + 0] = "auto";
 658     arches[nr + 1] = NULL;
 659     /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
 660        of ``const char *''.  We just happen to know that the casts are
 661        safe. */
 662     c = add_set_enum_cmd ("architecture", class_support,
 663                           arches, &set_architecture_string,
 664                           "Set architecture of target.",
 665                           &setlist);
 666     set_cmd_sfunc (c, set_architecture);
 667     add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
 668     /* Don't use set_from_show - need to print both auto/manual and
 669        current setting. */
 670     add_cmd ("architecture", class_support, show_architecture,
 671              "Show the current target architecture", &showlist);
 672   }
 673 }
 674
 675
 676 /* Initialize a gdbarch info to values that will be automatically
 677    overridden.  Note: Originally, this ``struct info'' was initialized
 678    using memset(0).  Unfortunately, that ran into problems, namely
 679    BFD_ENDIAN_BIG is zero.  An explicit initialization function that
 680    can explicitly set each field to a well defined value is used.  */
 681
 682 void
 683 gdbarch_info_init (struct gdbarch_info *info)
 684 {
 685   memset (info, 0, sizeof (struct gdbarch_info));
 686   info->byte_order = BFD_ENDIAN_UNKNOWN;
 687   info->osabi = GDB_OSABI_UNINITIALIZED;
 688 }
 689
 690 /* Similar to init, but this time fill in the blanks.  Information is
 691    obtained from the specified architecture, global "set ..." options,
 692    and explicitly initialized INFO fields.  */
 693
 694 void
 695 gdbarch_info_fill (struct gdbarch *gdbarch, struct gdbarch_info *info)
 696 {
 697   /* "(gdb) set architecture ...".  */
 698   if (info->bfd_arch_info == NULL
 699       && !target_architecture_auto
 700       && gdbarch != NULL)
 701     info->bfd_arch_info = gdbarch_bfd_arch_info (gdbarch);
 702   if (info->bfd_arch_info == NULL
 703       && info->abfd != NULL
 704       && bfd_get_arch (info->abfd) != bfd_arch_unknown
 705       && bfd_get_arch (info->abfd) != bfd_arch_obscure)
 706     info->bfd_arch_info = bfd_get_arch_info (info->abfd);
 707   if (info->bfd_arch_info == NULL
 708       && gdbarch != NULL)
 709     info->bfd_arch_info = gdbarch_bfd_arch_info (gdbarch);
 710
 711   /* "(gdb) set byte-order ...".  */
 712   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 713       && !target_byte_order_auto
 714       && gdbarch != NULL)
 715     info->byte_order = gdbarch_byte_order (gdbarch);
 716   /* From the INFO struct.  */
 717   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 718       && info->abfd != NULL)
 719     info->byte_order = (bfd_big_endian (info->abfd) ? BFD_ENDIAN_BIG
 720                        : bfd_little_endian (info->abfd) ? BFD_ENDIAN_LITTLE
 721                        : BFD_ENDIAN_UNKNOWN);
 722   /* From the current target.  */
 723   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 724       && gdbarch != NULL)
 725     info->byte_order = gdbarch_byte_order (gdbarch);
 726
 727   /* "(gdb) set osabi ...".  Handled by gdbarch_lookup_osabi.  */
 728   if (info->osabi == GDB_OSABI_UNINITIALIZED)
 729     info->osabi = gdbarch_lookup_osabi (info->abfd);
 730   if (info->osabi == GDB_OSABI_UNINITIALIZED
 731       && gdbarch != NULL)
 732     info->osabi = gdbarch_osabi (gdbarch);
 733
 734   /* Must have at least filled in the architecture.  */
 735   gdb_assert (info->bfd_arch_info != NULL);
 736 }
 737
 738 /* */
 739
 740 extern initialize_file_ftype _initialize_gdbarch_utils; /* -Wmissing-prototypes */
 741
 742 void
 743 _initialize_gdbarch_utils (void)
 744 {
 745   struct cmd_list_element *c;
 746   c = add_set_enum_cmd ("endian", class_support,
 747                         endian_enum, &set_endian_string,
 748                         "Set endianness of target.",
 749                         &setlist);
 750   set_cmd_sfunc (c, set_endian);
 751   /* Don't use set_from_show - need to print both auto/manual and
 752      current setting. */
 753   add_cmd ("endian", class_support, show_endian,
 754            "Show the current byte-order", &showlist);
 755 }