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 CORE_ADDR
  88 generic_skip_trampoline_code (CORE_ADDR pc)
  89 {
  90   return 0;
  91 }
  92
  93 CORE_ADDR
  94 generic_skip_solib_resolver (struct gdbarch *gdbarch, CORE_ADDR pc)
  95 {
  96   return 0;
  97 }
  98
  99 int
 100 generic_in_solib_call_trampoline (CORE_ADDR pc, char *name)
 101 {
 102   return 0;
 103 }
 104
 105 int
 106 generic_in_solib_return_trampoline (CORE_ADDR pc, char *name)
 107 {
 108   return 0;
 109 }
 110
 111 int
 112 generic_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
 113 {
 114   return 0;
 115 }
 116
 117 void
 118 generic_remote_translate_xfer_address (struct gdbarch *gdbarch,
 119                                        struct regcache *regcache,
 120                                        CORE_ADDR gdb_addr, int gdb_len,
 121                                        CORE_ADDR * rem_addr, int *rem_len)
 122 {
 123   *rem_addr = gdb_addr;
 124   *rem_len = gdb_len;
 125 }
 126
 127 /* Helper functions for INNER_THAN */
 128
 129 int
 130 core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs)
 131 {
 132   return (lhs < rhs);
 133 }
 134
 135 int
 136 core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs)
 137 {
 138   return (lhs > rhs);
 139 }
 140
 141
 142 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
 143
 144 const struct floatformat *
 145 default_float_format (struct gdbarch *gdbarch)
 146 {
 147   int byte_order = gdbarch_byte_order (gdbarch);
 148   switch (byte_order)
 149     {
 150     case BFD_ENDIAN_BIG:
 151       return &floatformat_ieee_single_big;
 152     case BFD_ENDIAN_LITTLE:
 153       return &floatformat_ieee_single_little;
 154     default:
 155       internal_error (__FILE__, __LINE__,
 156                       "default_float_format: bad byte order");
 157     }
 158 }
 159
 160
 161 const struct floatformat *
 162 default_double_format (struct gdbarch *gdbarch)
 163 {
 164   int byte_order = gdbarch_byte_order (gdbarch);
 165   switch (byte_order)
 166     {
 167     case BFD_ENDIAN_BIG:
 168       return &floatformat_ieee_double_big;
 169     case BFD_ENDIAN_LITTLE:
 170       return &floatformat_ieee_double_little;
 171     default:
 172       internal_error (__FILE__, __LINE__,
 173                       "default_double_format: bad byte order");
 174     }
 175 }
 176
 177 /* Misc helper functions for targets. */
 178
 179 CORE_ADDR
 180 core_addr_identity (CORE_ADDR addr)
 181 {
 182   return addr;
 183 }
 184
 185 CORE_ADDR
 186 convert_from_func_ptr_addr_identity (struct gdbarch *gdbarch, CORE_ADDR addr,
 187                                      struct target_ops *targ)
 188 {
 189   return addr;
 190 }
 191
 192 int
 193 no_op_reg_to_regnum (int reg)
 194 {
 195   return reg;
 196 }
 197
 198 CORE_ADDR
 199 deprecated_init_frame_pc_default (int fromleaf, struct frame_info *prev)
 200 {
 201   if (fromleaf && DEPRECATED_SAVED_PC_AFTER_CALL_P ())
 202     return DEPRECATED_SAVED_PC_AFTER_CALL (get_next_frame (prev));
 203   else if (get_next_frame (prev) != NULL)
 204     return DEPRECATED_FRAME_SAVED_PC (get_next_frame (prev));
 205   else
 206     return read_pc ();
 207 }
 208
 209 void
 210 default_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym)
 211 {
 212   return;
 213 }
 214
 215 void
 216 default_coff_make_msymbol_special (int val, struct minimal_symbol *msym)
 217 {
 218   return;
 219 }
 220
 221 int
 222 cannot_register_not (int regnum)
 223 {
 224   return 0;
 225 }
 226
 227 /* Legacy version of target_virtual_frame_pointer().  Assumes that
 228    there is an DEPRECATED_FP_REGNUM and that it is the same, cooked or
 229    raw.  */
 230
 231 void
 232 legacy_virtual_frame_pointer (CORE_ADDR pc,
 233                               int *frame_regnum,
 234                               LONGEST *frame_offset)
 235 {
 236   /* FIXME: cagney/2002-09-13: This code is used when identifying the
 237      frame pointer of the current PC.  It is assuming that a single
 238      register and an offset can determine this.  I think it should
 239      instead generate a byte code expression as that would work better
 240      with things like Dwarf2's CFI.  */
 241   if (DEPRECATED_FP_REGNUM >= 0 && DEPRECATED_FP_REGNUM < NUM_REGS)
 242     *frame_regnum = DEPRECATED_FP_REGNUM;
 243   else if (SP_REGNUM >= 0 && SP_REGNUM < NUM_REGS)
 244     *frame_regnum = SP_REGNUM;
 245   else
 246     /* Should this be an internal error?  I guess so, it is reflecting
 247        an architectural limitation in the current design.  */
 248     internal_error (__FILE__, __LINE__, "No virtual frame pointer available");
 249   *frame_offset = 0;
 250 }
 251
 252 /* Assume the world is sane, every register's virtual and real size
 253    is identical.  */
 254
 255 int
 256 generic_register_size (int regnum)
 257 {
 258   gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
 259   if (gdbarch_register_type_p (current_gdbarch))
 260     return TYPE_LENGTH (gdbarch_register_type (current_gdbarch, regnum));
 261   else
 262     /* FIXME: cagney/2003-03-01: Once all architectures implement
 263        gdbarch_register_type(), this entire function can go away.  It
 264        is made obsolete by register_size().  */
 265     return TYPE_LENGTH (DEPRECATED_REGISTER_VIRTUAL_TYPE (regnum)); /* OK */
 266 }
 267
 268 /* Assume all registers are adjacent.  */
 269
 270 int
 271 generic_register_byte (int regnum)
 272 {
 273   int byte;
 274   int i;
 275   gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
 276   byte = 0;
 277   for (i = 0; i < regnum; i++)
 278     {
 279       byte += generic_register_size (i);
 280     }
 281   return byte;
 282 }
 283
 284 \f
 285 int
 286 legacy_pc_in_sigtramp (CORE_ADDR pc, char *name)
 287 {
 288 #if defined (DEPRECATED_IN_SIGTRAMP)
 289   return DEPRECATED_IN_SIGTRAMP (pc, name);
 290 #else
 291   return name && strcmp ("_sigtramp", name) == 0;
 292 #endif
 293 }
 294
 295 int
 296 generic_convert_register_p (int regnum, struct type *type)
 297 {
 298   return 0;
 299 }
 300
 301 int
 302 default_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type)
 303 {
 304   if (DEPRECATED_REG_STRUCT_HAS_ADDR_P ()
 305       && DEPRECATED_REG_STRUCT_HAS_ADDR (processing_gcc_compilation, type))
 306     {
 307       CHECK_TYPEDEF (type);
 308
 309       return (TYPE_CODE (type) == TYPE_CODE_STRUCT
 310               || TYPE_CODE (type) == TYPE_CODE_UNION
 311               || TYPE_CODE (type) == TYPE_CODE_SET
 312               || TYPE_CODE (type) == TYPE_CODE_BITSTRING);
 313     }
 314
 315   return 0;
 316 }
 317
 318 \f
 319 /* Functions to manipulate the endianness of the target.  */
 320
 321 /* ``target_byte_order'' is only used when non- multi-arch.
 322    Multi-arch targets obtain the current byte order using the
 323    TARGET_BYTE_ORDER gdbarch method.
 324
 325    The choice of initial value is entirely arbitrary.  During startup,
 326    the function initialize_current_architecture() updates this value
 327    based on default byte-order information extracted from BFD.  */
 328 static int target_byte_order = BFD_ENDIAN_BIG;
 329 static int target_byte_order_auto = 1;
 330
 331 enum bfd_endian
 332 selected_byte_order (void)
 333 {
 334   if (target_byte_order_auto)
 335     return BFD_ENDIAN_UNKNOWN;
 336   else
 337     return target_byte_order;
 338 }
 339
 340 static const char endian_big[] = "big";
 341 static const char endian_little[] = "little";
 342 static const char endian_auto[] = "auto";
 343 static const char *endian_enum[] =
 344 {
 345   endian_big,
 346   endian_little,
 347   endian_auto,
 348   NULL,
 349 };
 350 static const char *set_endian_string;
 351
 352 /* Called by ``show endian''.  */
 353
 354 static void
 355 show_endian (char *args, int from_tty)
 356 {
 357   if (target_byte_order_auto)
 358     printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
 359                        (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
 360   else
 361     printf_unfiltered ("The target is assumed to be %s endian\n",
 362                        (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
 363 }
 364
 365 static void
 366 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
 367 {
 368   if (set_endian_string == endian_auto)
 369     {
 370       target_byte_order_auto = 1;
 371     }
 372   else if (set_endian_string == endian_little)
 373     {
 374       struct gdbarch_info info;
 375       target_byte_order_auto = 0;
 376       gdbarch_info_init (&info);
 377       info.byte_order = BFD_ENDIAN_LITTLE;
 378       if (! gdbarch_update_p (info))
 379         printf_unfiltered ("Little endian target not supported by GDB\n");
 380     }
 381   else if (set_endian_string == endian_big)
 382     {
 383       struct gdbarch_info info;
 384       target_byte_order_auto = 0;
 385       gdbarch_info_init (&info);
 386       info.byte_order = BFD_ENDIAN_BIG;
 387       if (! gdbarch_update_p (info))
 388         printf_unfiltered ("Big endian target not supported by GDB\n");
 389     }
 390   else
 391     internal_error (__FILE__, __LINE__,
 392                     "set_endian: bad value");
 393   show_endian (NULL, from_tty);
 394 }
 395
 396 /* Functions to manipulate the architecture of the target */
 397
 398 enum set_arch { set_arch_auto, set_arch_manual };
 399
 400 static int target_architecture_auto = 1;
 401
 402 static const char *set_architecture_string;
 403
 404 const char *
 405 selected_architecture_name (void)
 406 {
 407   if (target_architecture_auto)
 408     return NULL;
 409   else
 410     return set_architecture_string;
 411 }
 412
 413 /* Called if the user enters ``show architecture'' without an
 414    argument. */
 415
 416 static void
 417 show_architecture (char *args, int from_tty)
 418 {
 419   const char *arch;
 420   arch = TARGET_ARCHITECTURE->printable_name;
 421   if (target_architecture_auto)
 422     printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
 423   else
 424     printf_filtered ("The target architecture is assumed to be %s\n", arch);
 425 }
 426
 427
 428 /* Called if the user enters ``set architecture'' with or without an
 429    argument. */
 430
 431 static void
 432 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
 433 {
 434   if (strcmp (set_architecture_string, "auto") == 0)
 435     {
 436       target_architecture_auto = 1;
 437     }
 438   else
 439     {
 440       struct gdbarch_info info;
 441       gdbarch_info_init (&info);
 442       info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
 443       if (info.bfd_arch_info == NULL)
 444         internal_error (__FILE__, __LINE__,
 445                         "set_architecture: bfd_scan_arch failed");
 446       if (gdbarch_update_p (info))
 447         target_architecture_auto = 0;
 448       else
 449         printf_unfiltered ("Architecture `%s' not recognized.\n",
 450                            set_architecture_string);
 451     }
 452   show_architecture (NULL, from_tty);
 453 }
 454
 455 /* Try to select a global architecture that matches "info".  Return
 456    non-zero if the attempt succeds.  */
 457 int
 458 gdbarch_update_p (struct gdbarch_info info)
 459 {
 460   struct gdbarch *new_gdbarch = gdbarch_find_by_info (info);
 461
 462   /* If there no architecture by that name, reject the request.  */
 463   if (new_gdbarch == NULL)
 464     {
 465       if (gdbarch_debug)
 466         fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 467                             "Architecture not found\n");
 468       return 0;
 469     }
 470
 471   /* If it is the same old architecture, accept the request (but don't
 472      swap anything).  */
 473   if (new_gdbarch == current_gdbarch)
 474     {
 475       if (gdbarch_debug)
 476         fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 477                             "Architecture 0x%08lx (%s) unchanged\n",
 478                             (long) new_gdbarch,
 479                             gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
 480       return 1;
 481     }
 482
 483   /* It's a new architecture, swap it in.  */
 484   if (gdbarch_debug)
 485     fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
 486                         "New architecture 0x%08lx (%s) selected\n",
 487                         (long) new_gdbarch,
 488                         gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
 489   deprecated_current_gdbarch_select_hack (new_gdbarch);
 490
 491   return 1;
 492 }
 493
 494 /* Return the architecture for ABFD.  If no suitable architecture
 495    could be find, return NULL.  */
 496
 497 struct gdbarch *
 498 gdbarch_from_bfd (bfd *abfd)
 499 {
 500   struct gdbarch *old_gdbarch = current_gdbarch;
 501   struct gdbarch *new_gdbarch;
 502   struct gdbarch_info info;
 503
 504   gdbarch_info_init (&info);
 505   info.abfd = abfd;
 506   return gdbarch_find_by_info (info);
 507 }
 508
 509 /* Set the dynamic target-system-dependent parameters (architecture,
 510    byte-order) using information found in the BFD */
 511
 512 void
 513 set_gdbarch_from_file (bfd *abfd)
 514 {
 515   struct gdbarch *gdbarch;
 516
 517   gdbarch = gdbarch_from_bfd (abfd);
 518   if (gdbarch == NULL)
 519     error ("Architecture of file not recognized.\n");
 520   deprecated_current_gdbarch_select_hack (gdbarch);
 521 }
 522
 523 /* Initialize the current architecture.  Update the ``set
 524    architecture'' command so that it specifies a list of valid
 525    architectures.  */
 526
 527 #ifdef DEFAULT_BFD_ARCH
 528 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
 529 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
 530 #else
 531 static const bfd_arch_info_type *default_bfd_arch;
 532 #endif
 533
 534 #ifdef DEFAULT_BFD_VEC
 535 extern const bfd_target DEFAULT_BFD_VEC;
 536 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
 537 #else
 538 static const bfd_target *default_bfd_vec;
 539 #endif
 540
 541 void
 542 initialize_current_architecture (void)
 543 {
 544   const char **arches = gdbarch_printable_names ();
 545
 546   /* determine a default architecture and byte order. */
 547   struct gdbarch_info info;
 548   gdbarch_info_init (&info);
 549
 550   /* Find a default architecture. */
 551   if (info.bfd_arch_info == NULL
 552       && default_bfd_arch != NULL)
 553     info.bfd_arch_info = default_bfd_arch;
 554   if (info.bfd_arch_info == NULL)
 555     {
 556       /* Choose the architecture by taking the first one
 557          alphabetically. */
 558       const char *chosen = arches[0];
 559       const char **arch;
 560       for (arch = arches; *arch != NULL; arch++)
 561         {
 562           if (strcmp (*arch, chosen) < 0)
 563             chosen = *arch;
 564         }
 565       if (chosen == NULL)
 566         internal_error (__FILE__, __LINE__,
 567                         "initialize_current_architecture: No arch");
 568       info.bfd_arch_info = bfd_scan_arch (chosen);
 569       if (info.bfd_arch_info == NULL)
 570         internal_error (__FILE__, __LINE__,
 571                         "initialize_current_architecture: Arch not found");
 572     }
 573
 574   /* Take several guesses at a byte order.  */
 575   if (info.byte_order == BFD_ENDIAN_UNKNOWN
 576       && default_bfd_vec != NULL)
 577     {
 578       /* Extract BFD's default vector's byte order. */
 579       switch (default_bfd_vec->byteorder)
 580         {
 581         case BFD_ENDIAN_BIG:
 582           info.byte_order = BFD_ENDIAN_BIG;
 583           break;
 584         case BFD_ENDIAN_LITTLE:
 585           info.byte_order = BFD_ENDIAN_LITTLE;
 586           break;
 587         default:
 588           break;
 589         }
 590     }
 591   if (info.byte_order == BFD_ENDIAN_UNKNOWN)
 592     {
 593       /* look for ``*el-*'' in the target name. */
 594       const char *chp;
 595       chp = strchr (target_name, '-');
 596       if (chp != NULL
 597           && chp - 2 >= target_name
 598           && strncmp (chp - 2, "el", 2) == 0)
 599         info.byte_order = BFD_ENDIAN_LITTLE;
 600     }
 601   if (info.byte_order == BFD_ENDIAN_UNKNOWN)
 602     {
 603       /* Wire it to big-endian!!! */
 604       info.byte_order = BFD_ENDIAN_BIG;
 605     }
 606
 607   if (! gdbarch_update_p (info))
 608     internal_error (__FILE__, __LINE__,
 609                     "initialize_current_architecture: Selection of initial architecture failed");
 610
 611   /* Create the ``set architecture'' command appending ``auto'' to the
 612      list of architectures. */
 613   {
 614     struct cmd_list_element *c;
 615     /* Append ``auto''. */
 616     int nr;
 617     for (nr = 0; arches[nr] != NULL; nr++);
 618     arches = xrealloc (arches, sizeof (char*) * (nr + 2));
 619     arches[nr + 0] = "auto";
 620     arches[nr + 1] = NULL;
 621     /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
 622        of ``const char *''.  We just happen to know that the casts are
 623        safe. */
 624     c = add_set_enum_cmd ("architecture", class_support,
 625                           arches, &set_architecture_string,
 626                           "Set architecture of target.",
 627                           &setlist);
 628     set_cmd_sfunc (c, set_architecture);
 629     add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
 630     /* Don't use set_from_show - need to print both auto/manual and
 631        current setting. */
 632     add_cmd ("architecture", class_support, show_architecture,
 633              "Show the current target architecture", &showlist);
 634   }
 635 }
 636
 637
 638 /* Initialize a gdbarch info to values that will be automatically
 639    overridden.  Note: Originally, this ``struct info'' was initialized
 640    using memset(0).  Unfortunately, that ran into problems, namely
 641    BFD_ENDIAN_BIG is zero.  An explicit initialization function that
 642    can explicitly set each field to a well defined value is used.  */
 643
 644 void
 645 gdbarch_info_init (struct gdbarch_info *info)
 646 {
 647   memset (info, 0, sizeof (struct gdbarch_info));
 648   info->byte_order = BFD_ENDIAN_UNKNOWN;
 649   info->osabi = GDB_OSABI_UNINITIALIZED;
 650 }
 651
 652 /* Similar to init, but this time fill in the blanks.  Information is
 653    obtained from the specified architecture, global "set ..." options,
 654    and explicitly initialized INFO fields.  */
 655
 656 void
 657 gdbarch_info_fill (struct gdbarch *gdbarch, struct gdbarch_info *info)
 658 {
 659   /* "(gdb) set architecture ...".  */
 660   if (info->bfd_arch_info == NULL
 661       && !target_architecture_auto
 662       && gdbarch != NULL)
 663     info->bfd_arch_info = gdbarch_bfd_arch_info (gdbarch);
 664   if (info->bfd_arch_info == NULL
 665       && info->abfd != NULL
 666       && bfd_get_arch (info->abfd) != bfd_arch_unknown
 667       && bfd_get_arch (info->abfd) != bfd_arch_obscure)
 668     info->bfd_arch_info = bfd_get_arch_info (info->abfd);
 669   if (info->bfd_arch_info == NULL
 670       && gdbarch != NULL)
 671     info->bfd_arch_info = gdbarch_bfd_arch_info (gdbarch);
 672
 673   /* "(gdb) set byte-order ...".  */
 674   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 675       && !target_byte_order_auto
 676       && gdbarch != NULL)
 677     info->byte_order = gdbarch_byte_order (gdbarch);
 678   /* From the INFO struct.  */
 679   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 680       && info->abfd != NULL)
 681     info->byte_order = (bfd_big_endian (info->abfd) ? BFD_ENDIAN_BIG
 682                        : bfd_little_endian (info->abfd) ? BFD_ENDIAN_LITTLE
 683                        : BFD_ENDIAN_UNKNOWN);
 684   /* From the current target.  */
 685   if (info->byte_order == BFD_ENDIAN_UNKNOWN
 686       && gdbarch != NULL)
 687     info->byte_order = gdbarch_byte_order (gdbarch);
 688
 689   /* "(gdb) set osabi ...".  Handled by gdbarch_lookup_osabi.  */
 690   if (info->osabi == GDB_OSABI_UNINITIALIZED)
 691     info->osabi = gdbarch_lookup_osabi (info->abfd);
 692   if (info->osabi == GDB_OSABI_UNINITIALIZED
 693       && gdbarch != NULL)
 694     info->osabi = gdbarch_osabi (gdbarch);
 695
 696   /* Must have at least filled in the architecture.  */
 697   gdb_assert (info->bfd_arch_info != NULL);
 698 }
 699
 700 /* */
 701
 702 extern initialize_file_ftype _initialize_gdbarch_utils; /* -Wmissing-prototypes */
 703
 704 void
 705 _initialize_gdbarch_utils (void)
 706 {
 707   struct cmd_list_element *c;
 708   c = add_set_enum_cmd ("endian", class_support,
 709                         endian_enum, &set_endian_string,
 710                         "Set endianness of target.",
 711                         &setlist);
 712   set_cmd_sfunc (c, set_endian);
 713   /* Don't use set_from_show - need to print both auto/manual and
 714      current setting. */
 715   add_cmd ("endian", class_support, show_endian,
 716            "Show the current byte-order", &showlist);
 717 }