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 (IN_SIGTRAMP)
 302   if (SIGTRAMP_START_P ())
 303     return (pc) >= SIGTRAMP_START (pc) && (pc) < SIGTRAMP_END (pc);
 304   else
 305     return name && strcmp ("_sigtramp", name) == 0;
 306 #else
 307   return IN_SIGTRAMP (pc, name);
 308 #endif
 309 }
 310
 311 int
 312 legacy_convert_register_p (int regnum, struct type *type)
 313 {
 314   return (DEPRECATED_REGISTER_CONVERTIBLE_P ()
 315           && DEPRECATED_REGISTER_CONVERTIBLE (regnum));
 316 }
 317
 318 void
 319 legacy_register_to_value (struct frame_info *frame, int regnum,
 320                           struct type *type, void *to)
 321 {
 322   char from[MAX_REGISTER_SIZE];
 323   get_frame_register (frame, regnum, from);
 324   DEPRECATED_REGISTER_CONVERT_TO_VIRTUAL (regnum, type, from, to);
 325 }
 326
 327 void
 328 legacy_value_to_register (struct frame_info *frame, int regnum,
 329                           struct type *type, const void *tmp)
 330 {
 331   char to[MAX_REGISTER_SIZE];
 332   char *from = alloca (TYPE_LENGTH (type));
 333   memcpy (from, from, TYPE_LENGTH (type));
 334   DEPRECATED_REGISTER_CONVERT_TO_RAW (type, regnum, from, to);
 335   put_frame_register (frame, regnum, to);
 336 }
 337
 338 int
 339 default_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type)
 340 {
 341   if (DEPRECATED_REG_STRUCT_HAS_ADDR_P ()
 342       && DEPRECATED_REG_STRUCT_HAS_ADDR (processing_gcc_compilation, type))
 343     {
 344       CHECK_TYPEDEF (type);
 345
 346       return (TYPE_CODE (type) == TYPE_CODE_STRUCT
 347               || TYPE_CODE (type) == TYPE_CODE_UNION
 348               || TYPE_CODE (type) == TYPE_CODE_SET
 349               || TYPE_CODE (type) == TYPE_CODE_BITSTRING);
 350     }
 351
 352   return 0;
 353 }
 354
 355 \f
 356 /* Functions to manipulate the endianness of the target.  */
 357
 358 /* ``target_byte_order'' is only used when non- multi-arch.
 359    Multi-arch targets obtain the current byte order using the
 360    TARGET_BYTE_ORDER gdbarch method.
 361
 362    The choice of initial value is entirely arbitrary.  During startup,
 363    the function initialize_current_architecture() updates this value
 364    based on default byte-order information extracted from BFD.  */
 365 static int target_byte_order = BFD_ENDIAN_BIG;
 366 static int target_byte_order_auto = 1;
 367
 368 enum bfd_endian
 369 selected_byte_order (void)
 370 {
 371   if (target_byte_order_auto)
 372     return BFD_ENDIAN_UNKNOWN;
 373   else
 374     return target_byte_order;
 375 }
 376
 377 static const char endian_big[] = "big";
 378 static const char endian_little[] = "little";
 379 static const char endian_auto[] = "auto";
 380 static const char *endian_enum[] =
 381 {
 382   endian_big,
 383   endian_little,
 384   endian_auto,
 385   NULL,
 386 };
 387 static const char *set_endian_string;
 388
 389 /* Called by ``show endian''.  */
 390
 391 static void
 392 show_endian (char *args, int from_tty)
 393 {
 394   if (target_byte_order_auto)
 395     printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
 396                        (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
 397   else
 398     printf_unfiltered ("The target is assumed to be %s endian\n",
 399                        (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
 400 }
 401
 402 static void
 403 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
 404 {
 405   if (set_endian_string == endian_auto)
 406     {
 407       target_byte_order_auto = 1;
 408     }
 409   else if (set_endian_string == endian_little)
 410     {
 411       struct gdbarch_info info;
 412       target_byte_order_auto = 0;
 413       gdbarch_info_init (&info);
 414       info.byte_order = BFD_ENDIAN_LITTLE;
 415       if (! gdbarch_update_p (info))
 416         printf_unfiltered ("Little endian target not supported by GDB\n");
 417     }
 418   else if (set_endian_string == endian_big)
 419     {
 420       struct gdbarch_info info;
 421       target_byte_order_auto = 0;
 422       gdbarch_info_init (&info);
 423       info.byte_order = BFD_ENDIAN_BIG;
 424       if (! gdbarch_update_p (info))
 425         printf_unfiltered ("Big endian target not supported by GDB\n");
 426     }
 427   else
 428     internal_error (__FILE__, __LINE__,
 429                     "set_endian: bad value");
 430   show_endian (NULL, from_tty);
 431 }
 432
 433 /* Functions to manipulate the architecture of the target */
 434
 435 enum set_arch { set_arch_auto, set_arch_manual };
 436
 437 static int target_architecture_auto = 1;
 438
 439 static const char *set_architecture_string;
 440
 441 const char *
 442 selected_architecture_name (void)
 443 {
 444   if (target_architecture_auto)
 445     return NULL;
 446   else
 447     return set_architecture_string;
 448 }
 449
 450 /* Called if the user enters ``show architecture'' without an
 451    argument. */
 452
 453 static void
 454 show_architecture (char *args, int from_tty)
 455 {
 456   const char *arch;
 457   arch = TARGET_ARCHITECTURE->printable_name;
 458   if (target_architecture_auto)
 459     printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
 460   else
 461     printf_filtered ("The target architecture is assumed to be %s\n", arch);
 462 }
 463
 464
 465 /* Called if the user enters ``set architecture'' with or without an
 466    argument. */
 467
 468 static void
 469 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
 470 {
 471   if (strcmp (set_architecture_string, "auto") == 0)
 472     {
 473       target_architecture_auto = 1;
 474     }
 475   else
 476     {
 477       struct gdbarch_info info;
 478       gdbarch_info_init (&info);
 479       info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
 480       if (info.bfd_arch_info == NULL)
 481         internal_error (__FILE__, __LINE__,
 482                         "set_architecture: bfd_scan_arch failed");
 483       if (gdbarch_update_p (info))
 484         target_architecture_auto = 0;
 485       else
 486         printf_unfiltered ("Architecture `%s' not recognized.\n",
 487                            set_architecture_string);
 488     }
 489   show_architecture (NULL, from_tty);
 490 }
 491
 492 /* Try to select a global architecture that matches "info".  Return
 493    non-zero if the attempt succeds.  */
 494 int
 495 gdbarch_update_p (struct gdbarch_info info)
 496 {
 497   struct gdbarch *new_gdbarch = gdbarch_find_by_info (info);
 498
 499   /* If there no architecture by that name, reject the request.  */
 500   if (new_gdbarch == NULL)
 501     {
 502       if (gdbarch_debug)
 503         fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 504                             "Architecture not found\n");
 505       return 0;
 506     }
 507
 508   /* If it is the same old architecture, accept the request (but don't
 509      swap anything).  */
 510   if (new_gdbarch == current_gdbarch)
 511     {
 512       if (gdbarch_debug)
 513         fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 514                             "Architecture 0x%08lx (%s) unchanged\n",
 515                             (long) new_gdbarch,
 516                             gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
 517       return 1;
 518     }
 519
 520   /* It's a new architecture, swap it in.  */
 521   if (gdbarch_debug)
 522     fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 523                         "New architecture 0x%08lx (%s) selected\n",
 524                         (long) new_gdbarch,
 525                         gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
 526   deprecated_current_gdbarch_select_hack (new_gdbarch);
 527
 528   return 1;
 529 }
 530
 531 /* Return the architecture for ABFD.  If no suitable architecture
 532    could be find, return NULL.  */
 533
 534 struct gdbarch *
 535 gdbarch_from_bfd (bfd *abfd)
 536 {
 537   struct gdbarch *old_gdbarch = current_gdbarch;
 538   struct gdbarch *new_gdbarch;
 539   struct gdbarch_info info;
 540
 541   gdbarch_info_init (&info);
 542   info.abfd = abfd;
 543   return gdbarch_find_by_info (info);
 544 }
 545
 546 /* Set the dynamic target-system-dependent parameters (architecture,
 547    byte-order) using information found in the BFD */
 548
 549 void
 550 set_gdbarch_from_file (bfd *abfd)
 551 {
 552   struct gdbarch *gdbarch;
 553
 554   gdbarch = gdbarch_from_bfd (abfd);
 555   if (gdbarch == NULL)
 556     error ("Architecture of file not recognized.\n");
 557   deprecated_current_gdbarch_select_hack (gdbarch);
 558 }
 559
 560 /* Initialize the current architecture.  Update the ``set
 561    architecture'' command so that it specifies a list of valid
 562    architectures.  */
 563
 564 #ifdef DEFAULT_BFD_ARCH
 565 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
 566 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
 567 #else
 568 static const bfd_arch_info_type *default_bfd_arch;
 569 #endif
 570
 571 #ifdef DEFAULT_BFD_VEC
 572 extern const bfd_target DEFAULT_BFD_VEC;
 573 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
 574 #else
 575 static const bfd_target *default_bfd_vec;
 576 #endif
 577
 578 void
 579 initialize_current_architecture (void)
 580 {
 581   const char **arches = gdbarch_printable_names ();
 582
 583   /* determine a default architecture and byte order. */
 584   struct gdbarch_info info;
 585   gdbarch_info_init (&info);
 586
 587   /* Find a default architecture. */
 588   if (info.bfd_arch_info == NULL
 589       && default_bfd_arch != NULL)
 590     info.bfd_arch_info = default_bfd_arch;
 591   if (info.bfd_arch_info == NULL)
 592     {
 593       /* Choose the architecture by taking the first one
 594          alphabetically. */
 595       const char *chosen = arches[0];
 596       const char **arch;
 597       for (arch = arches; *arch != NULL; arch++)
 598         {
 599           if (strcmp (*arch, chosen) < 0)
 600             chosen = *arch;
 601         }
 602       if (chosen == NULL)
 603         internal_error (__FILE__, __LINE__,
 604                         "initialize_current_architecture: No arch");
 605       info.bfd_arch_info = bfd_scan_arch (chosen);
 606       if (info.bfd_arch_info == NULL)
 607         internal_error (__FILE__, __LINE__,
 608                         "initialize_current_architecture: Arch not found");
 609     }
 610
 611   /* Take several guesses at a byte order.  */
 612   if (info.byte_order == BFD_ENDIAN_UNKNOWN
 613       && default_bfd_vec != NULL)
 614     {
 615       /* Extract BFD's default vector's byte order. */
 616       switch (default_bfd_vec->byteorder)
 617         {
 618         case BFD_ENDIAN_BIG:
 619           info.byte_order = BFD_ENDIAN_BIG;
 620           break;
 621         case BFD_ENDIAN_LITTLE:
 622           info.byte_order = BFD_ENDIAN_LITTLE;
 623           break;
 624         default:
 625           break;
 626         }
 627     }
 628   if (info.byte_order == BFD_ENDIAN_UNKNOWN)
 629     {
 630       /* look for ``*el-*'' in the target name. */
 631       const char *chp;
 632       chp = strchr (target_name, '-');
 633       if (chp != NULL
 634           && chp - 2 >= target_name
 635           && strncmp (chp - 2, "el", 2) == 0)
 636         info.byte_order = BFD_ENDIAN_LITTLE;
 637     }
 638   if (info.byte_order == BFD_ENDIAN_UNKNOWN)
 639     {
 640       /* Wire it to big-endian!!! */
 641       info.byte_order = BFD_ENDIAN_BIG;
 642     }
 643
 644   if (! gdbarch_update_p (info))
 645     internal_error (__FILE__, __LINE__,
 646                     "initialize_current_architecture: Selection of initial architecture failed");
 647
 648   /* Create the ``set architecture'' command appending ``auto'' to the
 649      list of architectures. */
 650   {
 651     struct cmd_list_element *c;
 652     /* Append ``auto''. */
 653     int nr;
 654     for (nr = 0; arches[nr] != NULL; nr++);
 655     arches = xrealloc (arches, sizeof (char*) * (nr + 2));
 656     arches[nr + 0] = "auto";
 657     arches[nr + 1] = NULL;
 658     /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
 659        of ``const char *''.  We just happen to know that the casts are
 660        safe. */
 661     c = add_set_enum_cmd ("architecture", class_support,
 662                           arches, &set_architecture_string,
 663                           "Set architecture of target.",
 664                           &setlist);
 665     set_cmd_sfunc (c, set_architecture);
 666     add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
 667     /* Don't use set_from_show - need to print both auto/manual and
 668        current setting. */
 669     add_cmd ("architecture", class_support, show_architecture,
 670              "Show the current target architecture", &showlist);
 671   }
 672 }
 673
 674
 675 /* Initialize a gdbarch info to values that will be automatically
 676    overridden.  Note: Originally, this ``struct info'' was initialized
 677    using memset(0).  Unfortunately, that ran into problems, namely
 678    BFD_ENDIAN_BIG is zero.  An explicit initialization function that
 679    can explicitly set each field to a well defined value is used.  */
 680
 681 void
 682 gdbarch_info_init (struct gdbarch_info *info)
 683 {
 684   memset (info, 0, sizeof (struct gdbarch_info));
 685   info->byte_order = BFD_ENDIAN_UNKNOWN;
 686   info->osabi = GDB_OSABI_UNINITIALIZED;
 687 }
 688
 689 /* Similar to init, but this time fill in the blanks.  Information is
 690    obtained from the specified architecture, global "set ..." options,
 691    and explicitly initialized INFO fields.  */
 692
 693 void
 694 gdbarch_info_fill (struct gdbarch *gdbarch, struct gdbarch_info *info)
 695 {
 696   /* "(gdb) set architecture ...".  */
 697   if (info->bfd_arch_info == NULL
 698       && !target_architecture_auto
 699       && gdbarch != NULL)
 700     info->bfd_arch_info = gdbarch_bfd_arch_info (gdbarch);
 701   if (info->bfd_arch_info == NULL
 702       && info->abfd != NULL
 703       && bfd_get_arch (info->abfd) != bfd_arch_unknown
 704       && bfd_get_arch (info->abfd) != bfd_arch_obscure)
 705     info->bfd_arch_info = bfd_get_arch_info (info->abfd);
 706   if (info->bfd_arch_info == NULL
 707       && gdbarch != NULL)
 708     info->bfd_arch_info = gdbarch_bfd_arch_info (gdbarch);
 709
 710   /* "(gdb) set byte-order ...".  */
 711   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 712       && !target_byte_order_auto
 713       && gdbarch != NULL)
 714     info->byte_order = gdbarch_byte_order (gdbarch);
 715   /* From the INFO struct.  */
 716   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 717       && info->abfd != NULL)
 718     info->byte_order = (bfd_big_endian (info->abfd) ? BFD_ENDIAN_BIG
 719                        : bfd_little_endian (info->abfd) ? BFD_ENDIAN_LITTLE
 720                        : BFD_ENDIAN_UNKNOWN);
 721   /* From the current target.  */
 722   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 723       && gdbarch != NULL)
 724     info->byte_order = gdbarch_byte_order (gdbarch);
 725
 726   /* "(gdb) set osabi ...".  Handled by gdbarch_lookup_osabi.  */
 727   if (info->osabi == GDB_OSABI_UNINITIALIZED)
 728     info->osabi = gdbarch_lookup_osabi (info->abfd);
 729   if (info->osabi == GDB_OSABI_UNINITIALIZED
 730       && gdbarch != NULL)
 731     info->osabi = gdbarch_osabi (gdbarch);
 732
 733   /* Must have at least filled in the architecture.  */
 734   gdb_assert (info->bfd_arch_info != NULL);
 735 }
 736
 737 /* */
 738
 739 extern initialize_file_ftype _initialize_gdbarch_utils; /* -Wmissing-prototypes */
 740
 741 void
 742 _initialize_gdbarch_utils (void)
 743 {
 744   struct cmd_list_element *c;
 745   c = add_set_enum_cmd ("endian", class_support,
 746                         endian_enum, &set_endian_string,
 747                         "Set endianness of target.",
 748                         &setlist);
 749   set_cmd_sfunc (c, set_endian);
 750   /* Don't use set_from_show - need to print both auto/manual and
 751      current setting. */
 752   add_cmd ("endian", class_support, show_endian,
 753            "Show the current byte-order", &showlist);
 754 }