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   return DEPRECATED_IN_SIGTRAMP (pc, name);
 303 #else
 304   return name && strcmp ("_sigtramp", name) == 0;
 305 #endif
 306 }
 307
 308 int
 309 legacy_convert_register_p (int regnum, struct type *type)
 310 {
 311   return (DEPRECATED_REGISTER_CONVERTIBLE_P ()
 312           && DEPRECATED_REGISTER_CONVERTIBLE (regnum));
 313 }
 314
 315 void
 316 legacy_register_to_value (struct frame_info *frame, int regnum,
 317                           struct type *type, void *to)
 318 {
 319   char from[MAX_REGISTER_SIZE];
 320   get_frame_register (frame, regnum, from);
 321   DEPRECATED_REGISTER_CONVERT_TO_VIRTUAL (regnum, type, from, to);
 322 }
 323
 324 void
 325 legacy_value_to_register (struct frame_info *frame, int regnum,
 326                           struct type *type, const void *tmp)
 327 {
 328   char to[MAX_REGISTER_SIZE];
 329   char *from = alloca (TYPE_LENGTH (type));
 330   memcpy (from, from, TYPE_LENGTH (type));
 331   DEPRECATED_REGISTER_CONVERT_TO_RAW (type, regnum, from, to);
 332   put_frame_register (frame, regnum, to);
 333 }
 334
 335 int
 336 default_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type)
 337 {
 338   if (DEPRECATED_REG_STRUCT_HAS_ADDR_P ()
 339       && DEPRECATED_REG_STRUCT_HAS_ADDR (processing_gcc_compilation, type))
 340     {
 341       CHECK_TYPEDEF (type);
 342
 343       return (TYPE_CODE (type) == TYPE_CODE_STRUCT
 344               || TYPE_CODE (type) == TYPE_CODE_UNION
 345               || TYPE_CODE (type) == TYPE_CODE_SET
 346               || TYPE_CODE (type) == TYPE_CODE_BITSTRING);
 347     }
 348
 349   return 0;
 350 }
 351
 352 \f
 353 /* Functions to manipulate the endianness of the target.  */
 354
 355 /* ``target_byte_order'' is only used when non- multi-arch.
 356    Multi-arch targets obtain the current byte order using the
 357    TARGET_BYTE_ORDER gdbarch method.
 358
 359    The choice of initial value is entirely arbitrary.  During startup,
 360    the function initialize_current_architecture() updates this value
 361    based on default byte-order information extracted from BFD.  */
 362 static int target_byte_order = BFD_ENDIAN_BIG;
 363 static int target_byte_order_auto = 1;
 364
 365 enum bfd_endian
 366 selected_byte_order (void)
 367 {
 368   if (target_byte_order_auto)
 369     return BFD_ENDIAN_UNKNOWN;
 370   else
 371     return target_byte_order;
 372 }
 373
 374 static const char endian_big[] = "big";
 375 static const char endian_little[] = "little";
 376 static const char endian_auto[] = "auto";
 377 static const char *endian_enum[] =
 378 {
 379   endian_big,
 380   endian_little,
 381   endian_auto,
 382   NULL,
 383 };
 384 static const char *set_endian_string;
 385
 386 /* Called by ``show endian''.  */
 387
 388 static void
 389 show_endian (char *args, int from_tty)
 390 {
 391   if (target_byte_order_auto)
 392     printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
 393                        (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
 394   else
 395     printf_unfiltered ("The target is assumed to be %s endian\n",
 396                        (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
 397 }
 398
 399 static void
 400 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
 401 {
 402   if (set_endian_string == endian_auto)
 403     {
 404       target_byte_order_auto = 1;
 405     }
 406   else if (set_endian_string == endian_little)
 407     {
 408       struct gdbarch_info info;
 409       target_byte_order_auto = 0;
 410       gdbarch_info_init (&info);
 411       info.byte_order = BFD_ENDIAN_LITTLE;
 412       if (! gdbarch_update_p (info))
 413         printf_unfiltered ("Little endian target not supported by GDB\n");
 414     }
 415   else if (set_endian_string == endian_big)
 416     {
 417       struct gdbarch_info info;
 418       target_byte_order_auto = 0;
 419       gdbarch_info_init (&info);
 420       info.byte_order = BFD_ENDIAN_BIG;
 421       if (! gdbarch_update_p (info))
 422         printf_unfiltered ("Big endian target not supported by GDB\n");
 423     }
 424   else
 425     internal_error (__FILE__, __LINE__,
 426                     "set_endian: bad value");
 427   show_endian (NULL, from_tty);
 428 }
 429
 430 /* Functions to manipulate the architecture of the target */
 431
 432 enum set_arch { set_arch_auto, set_arch_manual };
 433
 434 static int target_architecture_auto = 1;
 435
 436 static const char *set_architecture_string;
 437
 438 const char *
 439 selected_architecture_name (void)
 440 {
 441   if (target_architecture_auto)
 442     return NULL;
 443   else
 444     return set_architecture_string;
 445 }
 446
 447 /* Called if the user enters ``show architecture'' without an
 448    argument. */
 449
 450 static void
 451 show_architecture (char *args, int from_tty)
 452 {
 453   const char *arch;
 454   arch = TARGET_ARCHITECTURE->printable_name;
 455   if (target_architecture_auto)
 456     printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
 457   else
 458     printf_filtered ("The target architecture is assumed to be %s\n", arch);
 459 }
 460
 461
 462 /* Called if the user enters ``set architecture'' with or without an
 463    argument. */
 464
 465 static void
 466 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
 467 {
 468   if (strcmp (set_architecture_string, "auto") == 0)
 469     {
 470       target_architecture_auto = 1;
 471     }
 472   else
 473     {
 474       struct gdbarch_info info;
 475       gdbarch_info_init (&info);
 476       info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
 477       if (info.bfd_arch_info == NULL)
 478         internal_error (__FILE__, __LINE__,
 479                         "set_architecture: bfd_scan_arch failed");
 480       if (gdbarch_update_p (info))
 481         target_architecture_auto = 0;
 482       else
 483         printf_unfiltered ("Architecture `%s' not recognized.\n",
 484                            set_architecture_string);
 485     }
 486   show_architecture (NULL, from_tty);
 487 }
 488
 489 /* Try to select a global architecture that matches "info".  Return
 490    non-zero if the attempt succeds.  */
 491 int
 492 gdbarch_update_p (struct gdbarch_info info)
 493 {
 494   struct gdbarch *new_gdbarch = gdbarch_find_by_info (info);
 495
 496   /* If there no architecture by that name, reject the request.  */
 497   if (new_gdbarch == NULL)
 498     {
 499       if (gdbarch_debug)
 500         fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 501                             "Architecture not found\n");
 502       return 0;
 503     }
 504
 505   /* If it is the same old architecture, accept the request (but don't
 506      swap anything).  */
 507   if (new_gdbarch == current_gdbarch)
 508     {
 509       if (gdbarch_debug)
 510         fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 511                             "Architecture 0x%08lx (%s) unchanged\n",
 512                             (long) new_gdbarch,
 513                             gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
 514       return 1;
 515     }
 516
 517   /* It's a new architecture, swap it in.  */
 518   if (gdbarch_debug)
 519     fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 520                         "New architecture 0x%08lx (%s) selected\n",
 521                         (long) new_gdbarch,
 522                         gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
 523   deprecated_current_gdbarch_select_hack (new_gdbarch);
 524
 525   return 1;
 526 }
 527
 528 /* Return the architecture for ABFD.  If no suitable architecture
 529    could be find, return NULL.  */
 530
 531 struct gdbarch *
 532 gdbarch_from_bfd (bfd *abfd)
 533 {
 534   struct gdbarch *old_gdbarch = current_gdbarch;
 535   struct gdbarch *new_gdbarch;
 536   struct gdbarch_info info;
 537
 538   gdbarch_info_init (&info);
 539   info.abfd = abfd;
 540   return gdbarch_find_by_info (info);
 541 }
 542
 543 /* Set the dynamic target-system-dependent parameters (architecture,
 544    byte-order) using information found in the BFD */
 545
 546 void
 547 set_gdbarch_from_file (bfd *abfd)
 548 {
 549   struct gdbarch *gdbarch;
 550
 551   gdbarch = gdbarch_from_bfd (abfd);
 552   if (gdbarch == NULL)
 553     error ("Architecture of file not recognized.\n");
 554   deprecated_current_gdbarch_select_hack (gdbarch);
 555 }
 556
 557 /* Initialize the current architecture.  Update the ``set
 558    architecture'' command so that it specifies a list of valid
 559    architectures.  */
 560
 561 #ifdef DEFAULT_BFD_ARCH
 562 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
 563 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
 564 #else
 565 static const bfd_arch_info_type *default_bfd_arch;
 566 #endif
 567
 568 #ifdef DEFAULT_BFD_VEC
 569 extern const bfd_target DEFAULT_BFD_VEC;
 570 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
 571 #else
 572 static const bfd_target *default_bfd_vec;
 573 #endif
 574
 575 void
 576 initialize_current_architecture (void)
 577 {
 578   const char **arches = gdbarch_printable_names ();
 579
 580   /* determine a default architecture and byte order. */
 581   struct gdbarch_info info;
 582   gdbarch_info_init (&info);
 583
 584   /* Find a default architecture. */
 585   if (info.bfd_arch_info == NULL
 586       && default_bfd_arch != NULL)
 587     info.bfd_arch_info = default_bfd_arch;
 588   if (info.bfd_arch_info == NULL)
 589     {
 590       /* Choose the architecture by taking the first one
 591          alphabetically. */
 592       const char *chosen = arches[0];
 593       const char **arch;
 594       for (arch = arches; *arch != NULL; arch++)
 595         {
 596           if (strcmp (*arch, chosen) < 0)
 597             chosen = *arch;
 598         }
 599       if (chosen == NULL)
 600         internal_error (__FILE__, __LINE__,
 601                         "initialize_current_architecture: No arch");
 602       info.bfd_arch_info = bfd_scan_arch (chosen);
 603       if (info.bfd_arch_info == NULL)
 604         internal_error (__FILE__, __LINE__,
 605                         "initialize_current_architecture: Arch not found");
 606     }
 607
 608   /* Take several guesses at a byte order.  */
 609   if (info.byte_order == BFD_ENDIAN_UNKNOWN
 610       && default_bfd_vec != NULL)
 611     {
 612       /* Extract BFD's default vector's byte order. */
 613       switch (default_bfd_vec->byteorder)
 614         {
 615         case BFD_ENDIAN_BIG:
 616           info.byte_order = BFD_ENDIAN_BIG;
 617           break;
 618         case BFD_ENDIAN_LITTLE:
 619           info.byte_order = BFD_ENDIAN_LITTLE;
 620           break;
 621         default:
 622           break;
 623         }
 624     }
 625   if (info.byte_order == BFD_ENDIAN_UNKNOWN)
 626     {
 627       /* look for ``*el-*'' in the target name. */
 628       const char *chp;
 629       chp = strchr (target_name, '-');
 630       if (chp != NULL
 631           && chp - 2 >= target_name
 632           && strncmp (chp - 2, "el", 2) == 0)
 633         info.byte_order = BFD_ENDIAN_LITTLE;
 634     }
 635   if (info.byte_order == BFD_ENDIAN_UNKNOWN)
 636     {
 637       /* Wire it to big-endian!!! */
 638       info.byte_order = BFD_ENDIAN_BIG;
 639     }
 640
 641   if (! gdbarch_update_p (info))
 642     internal_error (__FILE__, __LINE__,
 643                     "initialize_current_architecture: Selection of initial architecture failed");
 644
 645   /* Create the ``set architecture'' command appending ``auto'' to the
 646      list of architectures. */
 647   {
 648     struct cmd_list_element *c;
 649     /* Append ``auto''. */
 650     int nr;
 651     for (nr = 0; arches[nr] != NULL; nr++);
 652     arches = xrealloc (arches, sizeof (char*) * (nr + 2));
 653     arches[nr + 0] = "auto";
 654     arches[nr + 1] = NULL;
 655     /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
 656        of ``const char *''.  We just happen to know that the casts are
 657        safe. */
 658     c = add_set_enum_cmd ("architecture", class_support,
 659                           arches, &set_architecture_string,
 660                           "Set architecture of target.",
 661                           &setlist);
 662     set_cmd_sfunc (c, set_architecture);
 663     add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
 664     /* Don't use set_from_show - need to print both auto/manual and
 665        current setting. */
 666     add_cmd ("architecture", class_support, show_architecture,
 667              "Show the current target architecture", &showlist);
 668   }
 669 }
 670
 671
 672 /* Initialize a gdbarch info to values that will be automatically
 673    overridden.  Note: Originally, this ``struct info'' was initialized
 674    using memset(0).  Unfortunately, that ran into problems, namely
 675    BFD_ENDIAN_BIG is zero.  An explicit initialization function that
 676    can explicitly set each field to a well defined value is used.  */
 677
 678 void
 679 gdbarch_info_init (struct gdbarch_info *info)
 680 {
 681   memset (info, 0, sizeof (struct gdbarch_info));
 682   info->byte_order = BFD_ENDIAN_UNKNOWN;
 683   info->osabi = GDB_OSABI_UNINITIALIZED;
 684 }
 685
 686 /* Similar to init, but this time fill in the blanks.  Information is
 687    obtained from the specified architecture, global "set ..." options,
 688    and explicitly initialized INFO fields.  */
 689
 690 void
 691 gdbarch_info_fill (struct gdbarch *gdbarch, struct gdbarch_info *info)
 692 {
 693   /* "(gdb) set architecture ...".  */
 694   if (info->bfd_arch_info == NULL
 695       && !target_architecture_auto
 696       && gdbarch != NULL)
 697     info->bfd_arch_info = gdbarch_bfd_arch_info (gdbarch);
 698   if (info->bfd_arch_info == NULL
 699       && info->abfd != NULL
 700       && bfd_get_arch (info->abfd) != bfd_arch_unknown
 701       && bfd_get_arch (info->abfd) != bfd_arch_obscure)
 702     info->bfd_arch_info = bfd_get_arch_info (info->abfd);
 703   if (info->bfd_arch_info == NULL
 704       && gdbarch != NULL)
 705     info->bfd_arch_info = gdbarch_bfd_arch_info (gdbarch);
 706
 707   /* "(gdb) set byte-order ...".  */
 708   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 709       && !target_byte_order_auto
 710       && gdbarch != NULL)
 711     info->byte_order = gdbarch_byte_order (gdbarch);
 712   /* From the INFO struct.  */
 713   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 714       && info->abfd != NULL)
 715     info->byte_order = (bfd_big_endian (info->abfd) ? BFD_ENDIAN_BIG
 716                        : bfd_little_endian (info->abfd) ? BFD_ENDIAN_LITTLE
 717                        : BFD_ENDIAN_UNKNOWN);
 718   /* From the current target.  */
 719   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 720       && gdbarch != NULL)
 721     info->byte_order = gdbarch_byte_order (gdbarch);
 722
 723   /* "(gdb) set osabi ...".  Handled by gdbarch_lookup_osabi.  */
 724   if (info->osabi == GDB_OSABI_UNINITIALIZED)
 725     info->osabi = gdbarch_lookup_osabi (info->abfd);
 726   if (info->osabi == GDB_OSABI_UNINITIALIZED
 727       && gdbarch != NULL)
 728     info->osabi = gdbarch_osabi (gdbarch);
 729
 730   /* Must have at least filled in the architecture.  */
 731   gdb_assert (info->bfd_arch_info != NULL);
 732 }
 733
 734 /* */
 735
 736 extern initialize_file_ftype _initialize_gdbarch_utils; /* -Wmissing-prototypes */
 737
 738 void
 739 _initialize_gdbarch_utils (void)
 740 {
 741   struct cmd_list_element *c;
 742   c = add_set_enum_cmd ("endian", class_support,
 743                         endian_enum, &set_endian_string,
 744                         "Set endianness of target.",
 745                         &setlist);
 746   set_cmd_sfunc (c, set_endian);
 747   /* Don't use set_from_show - need to print both auto/manual and
 748      current setting. */
 749   add_cmd ("endian", class_support, show_endian,
 750            "Show the current byte-order", &showlist);
 751 }