gdb/defs.h

   1 /* Basic, host-specific, and target-specific definitions for GDB.
   2    Copyright (C) 1986, 1989, 1991 Free Software Foundation, Inc.
   3
   4 This file is part of GDB.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #if !defined (DEFS_H)
  21 #define DEFS_H 1
  22
  23 #include <stdio.h>
  24
  25 /* First include ansidecl.h so we can use the various macro definitions
  26    here and in all subsequent file inclusions.  */
  27
  28 #include "ansidecl.h"
  29
  30 /* An address in the program being debugged.  Host byte order.  */
  31 typedef unsigned int CORE_ADDR;
  32
  33 #define min(a, b) ((a) < (b) ? (a) : (b))
  34 #define max(a, b) ((a) > (b) ? (a) : (b))
  35
  36 /* The character C++ uses to build identifiers that must be unique from
  37    the program's identifiers (such as $this and $$vptr).  */
  38 #define CPLUS_MARKER '$'        /* May be overridden to '.' for SysV */
  39
  40 #include <errno.h>              /* System call error return status */
  41
  42 extern int quit_flag;
  43 extern int immediate_quit;
  44 extern int sevenbit_strings;
  45
  46 extern void
  47 quit PARAMS ((void));
  48
  49 #define QUIT { if (quit_flag) quit (); }
  50
  51 /* Command classes are top-level categories into which commands are broken
  52    down for "help" purposes.
  53    Notes on classes: class_alias is for alias commands which are not
  54    abbreviations of the original command.  class-pseudo is for commands
  55    which are not really commands nor help topics ("stop").  */
  56
  57 enum command_class
  58 {
  59   /* Special args to help_list */
  60   all_classes = -2, all_commands = -1,
  61   /* Classes of commands */
  62   no_class = -1, class_run = 0, class_vars, class_stack,
  63   class_files, class_support, class_info, class_breakpoint,
  64   class_alias, class_obscure, class_user, class_maintenance,
  65   class_pseudo
  66 };
  67
  68 /* the cleanup list records things that have to be undone
  69    if an error happens (descriptors to be closed, memory to be freed, etc.)
  70    Each link in the chain records a function to call and an
  71    argument to give it.
  72
  73    Use make_cleanup to add an element to the cleanup chain.
  74    Use do_cleanups to do all cleanup actions back to a given
  75    point in the chain.  Use discard_cleanups to remove cleanups
  76    from the chain back to a given point, not doing them.  */
  77
  78 struct cleanup
  79 {
  80   struct cleanup *next;
  81   void (*function) PARAMS ((PTR));
  82   PTR arg;
  83 };
  84
  85 /* From blockframe.c */
  86
  87 extern int
  88 inside_entry_func PARAMS ((CORE_ADDR));
  89
  90 extern int
  91 inside_entry_file PARAMS ((CORE_ADDR addr));
  92
  93 extern int
  94 inside_main_func PARAMS ((CORE_ADDR pc));
  95
  96 /* From cplus-dem.c */
  97
  98 extern char *
  99 cplus_demangle PARAMS ((const char *, int));
 100
 101 extern char *
 102 cplus_mangle_opname PARAMS ((char *, int));
 103
 104 /* From libmmalloc.a (memory mapped malloc library) */
 105
 106 extern PTR
 107 mmalloc_attach PARAMS ((int, PTR));
 108
 109 extern PTR
 110 mmalloc_detach PARAMS ((PTR));
 111
 112 extern PTR
 113 mmalloc PARAMS ((PTR, long));
 114
 115 extern PTR
 116 mrealloc PARAMS ((PTR, PTR, long));
 117
 118 extern void
 119 mfree PARAMS ((PTR, PTR));
 120
 121 extern int
 122 mmalloc_setkey PARAMS ((PTR, int, PTR));
 123
 124 extern PTR
 125 mmalloc_getkey PARAMS ((PTR, int));
 126
 127 /* From utils.c */
 128
 129 extern char *
 130 demangle_and_match PARAMS ((const char *, const char *, int));
 131
 132 extern int
 133 strcmp_iw PARAMS ((const char *, const char *));
 134
 135 extern char *
 136 safe_strerror PARAMS ((int));
 137
 138 extern char *
 139 safe_strsignal PARAMS ((int));
 140
 141 extern void
 142 init_malloc PARAMS ((PTR));
 143
 144 extern void
 145 request_quit PARAMS ((int));
 146
 147 extern void
 148 do_cleanups PARAMS ((struct cleanup *));
 149
 150 extern void
 151 discard_cleanups PARAMS ((struct cleanup *));
 152
 153 /* The bare make_cleanup function is one of those rare beasts that
 154    takes almost any type of function as the first arg and anything that
 155    will fit in a "void *" as the second arg.
 156
 157    Should be, once all calls and called-functions are cleaned up:
 158 extern struct cleanup *
 159 make_cleanup PARAMS ((void (*function) (PTR), PTR));
 160
 161    Until then, lint and/or various type-checking compiler options will
 162    complain about make_cleanup calls.  It'd be wrong to just cast things,
 163    since the type actually passed when the function is called would be
 164    wrong.  */
 165
 166 extern struct cleanup *
 167 make_cleanup ();
 168
 169 extern struct cleanup *
 170 save_cleanups PARAMS ((void));
 171
 172 extern void
 173 restore_cleanups PARAMS ((struct cleanup *));
 174
 175 extern void
 176 free_current_contents PARAMS ((char **));
 177
 178 extern void
 179 null_cleanup PARAMS ((char **));
 180
 181 extern int
 182 myread PARAMS ((int, char *, int));
 183
 184 extern int
 185 query ();
 186
 187 extern void
 188 begin_line PARAMS ((void));
 189
 190 extern void
 191 wrap_here PARAMS ((char *));
 192
 193 extern void
 194 reinitialize_more_filter PARAMS ((void));
 195
 196 extern int
 197 print_insn PARAMS ((CORE_ADDR, FILE *));
 198
 199 extern void
 200 fputs_filtered PARAMS ((const char *, FILE *));
 201
 202 extern void
 203 puts_filtered PARAMS ((char *));
 204
 205 extern void
 206 vprintf_filtered ();
 207
 208 extern void
 209 vfprintf_filtered ();
 210
 211 extern void
 212 fprintf_filtered ();
 213
 214 extern void
 215 fprintfi_filtered ();
 216
 217 extern void
 218 printf_filtered ();
 219
 220 extern void
 221 printfi_filtered ();
 222
 223 extern void
 224 print_spaces PARAMS ((int, FILE *));
 225
 226 extern void
 227 print_spaces_filtered PARAMS ((int, FILE *));
 228
 229 extern char *
 230 n_spaces PARAMS ((int));
 231
 232 extern void
 233 gdb_printchar PARAMS ((int, FILE *, int));
 234
 235 extern char *
 236 strdup_demangled PARAMS ((const char *));
 237
 238 extern void
 239 fprint_symbol PARAMS ((FILE *, char *));
 240
 241 extern void
 242 fputs_demangled PARAMS ((char *, FILE *, int));
 243
 244 extern void
 245 perror_with_name PARAMS ((char *));
 246
 247 extern void
 248 print_sys_errmsg PARAMS ((char *, int));
 249
 250 /* From regex.c */
 251
 252 extern char *
 253 re_comp PARAMS ((char *));
 254
 255 /* From symfile.c */
 256
 257 extern void
 258 symbol_file_command PARAMS ((char *, int));
 259
 260 /* From main.c */
 261
 262 extern char *
 263 skip_quoted PARAMS ((char *));
 264
 265 extern char *
 266 gdb_readline PARAMS ((char *));
 267
 268 extern char *
 269 command_line_input PARAMS ((char *, int));
 270
 271 extern void
 272 print_prompt PARAMS ((void));
 273
 274 extern int
 275 batch_mode PARAMS ((void));
 276
 277 extern int
 278 input_from_terminal_p PARAMS ((void));
 279
 280 extern int
 281 catch_errors PARAMS ((int (*) (char *), char *, char *));
 282
 283 /* From printcmd.c */
 284
 285 extern void
 286 set_next_address PARAMS ((CORE_ADDR));
 287
 288 extern void
 289 print_address_symbolic PARAMS ((CORE_ADDR, FILE *, int, char *));
 290
 291 extern void
 292 print_address PARAMS ((CORE_ADDR, FILE *));
 293
 294 /* From source.c */
 295
 296 extern int
 297 openp PARAMS ((char *, int, char *, int, int, char **));
 298
 299 extern void
 300 mod_path PARAMS ((char *, char **));
 301
 302 extern void
 303 directory_command PARAMS ((char *, int));
 304
 305 extern void
 306 init_source_path PARAMS ((void));
 307
 308 /* From findvar.c */
 309
 310 extern int
 311 read_relative_register_raw_bytes PARAMS ((int, char *));
 312
 313 /* From readline (but not in any readline .h files).  */
 314
 315 extern char *
 316 tilde_expand PARAMS ((char *));
 317
 318 /* Structure for saved commands lines
 319    (for breakpoints, defined commands, etc).  */
 320
 321 struct command_line
 322 {
 323   struct command_line *next;
 324   char *line;
 325 };
 326
 327 extern struct command_line *
 328 read_command_lines PARAMS ((void));
 329
 330 extern void
 331 free_command_lines PARAMS ((struct command_line **));
 332
 333 /* String containing the current directory (what getwd would return).  */
 334
 335 extern char *current_directory;
 336
 337 /* Default radixes for input and output.  Only some values supported.  */
 338 extern unsigned input_radix;
 339 extern unsigned output_radix;
 340
 341 /* Baud rate specified for communication with serial target systems.  */
 342 extern char *baud_rate;
 343
 344 /* Languages represented in the symbol table and elsewhere.
 345    This should probably be in language.h, but since enum's can't
 346    be forward declared to satisfy opaque references before their
 347    actual definition, needs to be here. */
 348
 349 enum language
 350 {
 351    language_unknown,            /* Language not known */
 352    language_auto,               /* Placeholder for automatic setting */
 353    language_c,                  /* C */
 354    language_cplus,              /* C++ */
 355                                 /* start-sanitize-chill */
 356    language_chill,              /* Chill */
 357                                 /* end-sanitize-chill */
 358    language_m2                  /* Modula-2 */
 359 };
 360
 361 /* Possibilities for prettyprint parameters to routines which print
 362    things.  Like enum language, this should be in value.h, but needs
 363    to be here for the same reason.  FIXME:  If we can eliminate this
 364    as an arg to LA_VAL_PRINT, then we can probably move it back to
 365    value.h. */
 366
 367 enum val_prettyprint
 368 {
 369   Val_no_prettyprint = 0,
 370   Val_prettyprint,
 371   /* Use the default setting which the user has specified.  */
 372   Val_pretty_default
 373 };
 374
 375 \f
 376 /* Host machine definition.  This will be a symlink to one of the
 377    xm-*.h files, built by the `configure' script.  */
 378
 379 #include "xm.h"
 380
 381 /* Native machine support.  This will be a symlink to one of the
 382    nm-*.h files, built by the `configure' script.  */
 383
 384 #include "nm.h"
 385
 386 /* If the xm.h file did not define the mode string used to open the
 387    files, assume that binary files are opened the same way as text
 388    files */
 389 #ifndef FOPEN_RB
 390 #include "fopen-same.h"
 391 #endif
 392
 393 /*
 394  * Allow things in gdb to be declared "const".  If compiling ANSI, it
 395  * just works.  If compiling with gcc but non-ansi, redefine to __const__.
 396  * If non-ansi, non-gcc, then eliminate "const" entirely, making those
 397  * objects be read-write rather than read-only.
 398  */
 399
 400 #ifndef const
 401 #ifndef __STDC__
 402 # ifdef __GNUC__
 403 #  define const __const__
 404 # else
 405 #  define const /*nothing*/
 406 # endif /* GNUC */
 407 #endif /* STDC */
 408 #endif /* const */
 409
 410 #ifndef volatile
 411 #ifndef __STDC__
 412 # ifdef __GNUC__
 413 #  define volatile __volatile__
 414 # else
 415 #  define volatile /*nothing*/
 416 # endif /* GNUC */
 417 #endif /* STDC */
 418 #endif /* volatile */
 419
 420 /* Some compilers (many AT&T SVR4 compilers for instance), do not accept
 421    declarations of functions that never return (exit for instance) as
 422    "volatile void".  For such compilers "NORETURN" can be defined away
 423    to keep them happy */
 424
 425 #ifndef NORETURN
 426 # ifdef __lucid
 427 #   define NORETURN /*nothing*/
 428 # else
 429 #   define NORETURN volatile
 430 # endif
 431 #endif
 432
 433 /* Defaults for system-wide constants (if not defined by xm.h, we fake it).  */
 434
 435 #if !defined (UINT_MAX)
 436 #define UINT_MAX 0xffffffff
 437 #endif
 438
 439 #if !defined (LONG_MAX)
 440 #define LONG_MAX 0x7fffffff
 441 #endif
 442
 443 #if !defined (INT_MAX)
 444 #define INT_MAX 0x7fffffff
 445 #endif
 446
 447 #if !defined (INT_MIN)
 448 /* Two's complement, 32 bit.  */
 449 #define INT_MIN -0x80000000
 450 #endif
 451
 452 /* Number of bits in a char or unsigned char for the target machine.
 453    Just like CHAR_BIT in <limits.h> but describes the target machine.  */
 454 #if !defined (TARGET_CHAR_BIT)
 455 #define TARGET_CHAR_BIT 8
 456 #endif
 457
 458 /* Number of bits in a short or unsigned short for the target machine. */
 459 #if !defined (TARGET_SHORT_BIT)
 460 #define TARGET_SHORT_BIT (sizeof (short) * TARGET_CHAR_BIT)
 461 #endif
 462
 463 /* Number of bits in an int or unsigned int for the target machine. */
 464 #if !defined (TARGET_INT_BIT)
 465 #define TARGET_INT_BIT (sizeof (int) * TARGET_CHAR_BIT)
 466 #endif
 467
 468 /* Number of bits in a long or unsigned long for the target machine. */
 469 #if !defined (TARGET_LONG_BIT)
 470 #define TARGET_LONG_BIT (sizeof (long) * TARGET_CHAR_BIT)
 471 #endif
 472
 473 /* Number of bits in a long long or unsigned long long for the target machine. */
 474 #if !defined (TARGET_LONG_LONG_BIT)
 475 #define TARGET_LONG_LONG_BIT (2 * TARGET_LONG_BIT)
 476 #endif
 477
 478 /* Number of bits in a float for the target machine. */
 479 #if !defined (TARGET_FLOAT_BIT)
 480 #define TARGET_FLOAT_BIT (sizeof (float) * TARGET_CHAR_BIT)
 481 #endif
 482
 483 /* Number of bits in a double for the target machine. */
 484 #if !defined (TARGET_DOUBLE_BIT)
 485 #define TARGET_DOUBLE_BIT (sizeof (double) * TARGET_CHAR_BIT)
 486 #endif
 487
 488 /* Number of bits in a long double for the target machine. */
 489 #if !defined (TARGET_LONG_DOUBLE_BIT)
 490 #define TARGET_LONG_DOUBLE_BIT (2 * TARGET_DOUBLE_BIT)
 491 #endif
 492
 493 /* Number of bits in a "complex" for the target machine. */
 494 #if !defined (TARGET_COMPLEX_BIT)
 495 #define TARGET_COMPLEX_BIT (2 * TARGET_FLOAT_BIT)
 496 #endif
 497
 498 /* Number of bits in a "double complex" for the target machine. */
 499 #if !defined (TARGET_DOUBLE_COMPLEX_BIT)
 500 #define TARGET_DOUBLE_COMPLEX_BIT (2 * TARGET_DOUBLE_BIT)
 501 #endif
 502
 503 /* Number of bits in a pointer for the target machine */
 504 #if !defined (TARGET_PTR_BIT)
 505 #define TARGET_PTR_BIT TARGET_INT_BIT
 506 #endif
 507
 508 /* Convert a LONGEST to an int.  This is used in contexts (e.g. number
 509    of arguments to a function, number in a value history, register
 510    number, etc.) where the value must not be larger than can fit
 511    in an int.  */
 512 #if !defined (longest_to_int)
 513 #if defined (LONG_LONG)
 514 #define longest_to_int(x) (((x) > INT_MAX || (x) < INT_MIN) \
 515                            ? (error ("Value out of range."),0) : (int) (x))
 516 #else /* No LONG_LONG.  */
 517 /* Assume sizeof (int) == sizeof (long).  */
 518 #define longest_to_int(x) ((int) (x))
 519 #endif /* No LONG_LONG.  */
 520 #endif /* No longest_to_int.  */
 521
 522 /* This should not be a typedef, because "unsigned LONGEST" needs
 523    to work. LONG_LONG is defined if the host has "long long".  */
 524
 525 #ifndef LONGEST
 526 # ifdef LONG_LONG
 527 #  define LONGEST long long
 528 # else
 529 #  define LONGEST long
 530 # endif
 531 #endif
 532
 533 /* Assorted functions we can declare, now that const and volatile are
 534    defined.  */
 535
 536 extern char *
 537 savestring PARAMS ((const char *, int));
 538
 539 extern char *
 540 msavestring PARAMS ((void *, const char *, int));
 541
 542 extern char *
 543 strsave PARAMS ((const char *));
 544
 545 extern char *
 546 mstrsave PARAMS ((void *, const char *));
 547
 548 extern char *
 549 concat PARAMS ((char *, ...));
 550
 551 extern PTR
 552 xmalloc PARAMS ((long));
 553
 554 extern PTR
 555 xrealloc PARAMS ((PTR, long));
 556
 557 extern PTR
 558 xmmalloc PARAMS ((PTR, long));
 559
 560 extern PTR
 561 xmrealloc PARAMS ((PTR, PTR, long));
 562
 563 extern PTR
 564 mmalloc PARAMS ((PTR, long));
 565
 566 extern PTR
 567 mrealloc PARAMS ((PTR, PTR, long));
 568
 569 extern void
 570 mfree PARAMS ((PTR, PTR));
 571
 572 extern int
 573 mmcheck PARAMS ((PTR, void (*) (void)));
 574
 575 extern int
 576 mmtrace PARAMS ((void));
 577
 578 extern int
 579 parse_escape PARAMS ((char **));
 580
 581 extern const char * const reg_names[];
 582
 583 extern NORETURN void                    /* Does not return to the caller.  */
 584 error ();
 585
 586 extern NORETURN void                    /* Does not return to the caller.  */
 587 fatal ();
 588
 589 extern NORETURN void                    /* Not specified as volatile in ... */
 590 exit PARAMS ((int));                    /* 4.10.4.3 */
 591
 592 extern NORETURN void                    /* Does not return to the caller.  */
 593 nomem PARAMS ((long));
 594
 595 extern NORETURN void                    /* Does not return to the caller.  */
 596 return_to_top_level PARAMS ((void));
 597
 598 extern void
 599 warning_setup PARAMS ((void));
 600
 601 extern void
 602 warning ();
 603
 604 /* Global functions from other, non-gdb GNU thingies (libiberty for
 605    instance) */
 606
 607 extern char *
 608 basename PARAMS ((char *));
 609
 610 extern char *
 611 getenv PARAMS ((const char *));
 612
 613 extern char **
 614 buildargv PARAMS ((char *));
 615
 616 extern void
 617 freeargv PARAMS ((char **));
 618
 619 extern char *
 620 strerrno PARAMS ((int));
 621
 622 extern char *
 623 strsigno PARAMS ((int));
 624
 625 extern int
 626 errno_max PARAMS ((void));
 627
 628 extern int
 629 signo_max PARAMS ((void));
 630
 631 extern int
 632 strtoerrno PARAMS ((char *));
 633
 634 extern int
 635 strtosigno PARAMS ((char *));
 636
 637 extern char *
 638 strsignal PARAMS ((int));
 639
 640 /* From other system libraries */
 641
 642 #ifndef PSIGNAL_IN_SIGNAL_H
 643 extern void
 644 psignal PARAMS ((unsigned, char *));
 645 #endif
 646
 647 /* For now, we can't include <stdlib.h> because it conflicts with
 648    "../include/getopt.h".  (FIXME)
 649
 650    However, if a function is defined in the ANSI C standard and a prototype
 651    for that function is defined and visible in any header file in an ANSI
 652    conforming environment, then that prototype must match the definition in
 653    the ANSI standard.  So we can just duplicate them here without conflict,
 654    since they must be the same in all conforming ANSI environments.  If
 655    these cause problems, then the environment is not ANSI conformant. */
 656
 657 #ifdef __STDC__
 658 #include <stddef.h>
 659 #endif
 660
 661 extern int
 662 fclose PARAMS ((FILE *stream));                         /* 4.9.5.1 */
 663
 664 extern void
 665 perror PARAMS ((const char *));                         /* 4.9.10.4 */
 666
 667 extern double
 668 atof PARAMS ((const char *nptr));                       /* 4.10.1.1 */
 669
 670 extern int
 671 atoi PARAMS ((const char *));                           /* 4.10.1.2 */
 672
 673 #ifndef MALLOC_INCOMPATIBLE
 674
 675 extern PTR
 676 malloc PARAMS ((size_t size));                          /* 4.10.3.3 */
 677
 678 extern PTR
 679 realloc PARAMS ((void *ptr, size_t size));              /* 4.10.3.4 */
 680
 681 extern void
 682 free PARAMS ((void *));                                 /* 4.10.3.2 */
 683
 684 #endif  /* MALLOC_INCOMPATIBLE */
 685
 686 extern void
 687 qsort PARAMS ((void *base, size_t nmemb,                /* 4.10.5.2 */
 688                size_t size,
 689                int (*comp)(const void *, const void *)));
 690
 691 #ifndef MEM_FNS_DECLARED        /* Some non-ANSI use void *, not char *.  */
 692 extern PTR
 693 memcpy PARAMS ((void *, const void *, size_t));         /* 4.11.2.1 */
 694 #endif
 695
 696 extern int
 697 memcmp PARAMS ((const void *, const void *, size_t));   /* 4.11.4.1 */
 698
 699 extern char *
 700 strchr PARAMS ((const char *, int));                    /* 4.11.5.2 */
 701
 702 extern char *
 703 strrchr PARAMS ((const char *, int));                   /* 4.11.5.5 */
 704
 705 extern char *
 706 strstr PARAMS ((const char *, const char *));           /* 4.11.5.7 */
 707
 708 extern char *
 709 strtok PARAMS ((char *, const char *));                 /* 4.11.5.8 */
 710
 711 #ifndef MEM_FNS_DECLARED        /* Some non-ANSI use void *, not char *.  */
 712 extern PTR
 713 memset PARAMS ((void *, int, size_t));                  /* 4.11.6.1 */
 714 #endif
 715
 716 extern char *
 717 strerror PARAMS ((int));                                /* 4.11.6.2 */
 718
 719 /* Various possibilities for alloca.  */
 720 #ifndef alloca
 721 # ifdef __GNUC__
 722 #  define alloca __builtin_alloca
 723 # else
 724 #  ifdef sparc
 725 #   include <alloca.h>          /* NOTE:  Doesn't declare alloca() */
 726 #  endif
 727 #  ifdef __STDC__
 728    extern void *alloca (size_t);
 729 #  else /* __STDC__ */
 730    extern char *alloca ();
 731 #  endif
 732 # endif
 733 #endif
 734
 735 /* TARGET_BYTE_ORDER and HOST_BYTE_ORDER must be defined to one of these.  */
 736
 737 #if !defined (BIG_ENDIAN)
 738 #define BIG_ENDIAN 4321
 739 #endif
 740
 741 #if !defined (LITTLE_ENDIAN)
 742 #define LITTLE_ENDIAN 1234
 743 #endif
 744
 745 /* Target-system-dependent parameters for GDB.
 746
 747    The standard thing is to include defs.h.  However, files that are
 748    specific to a particular target can define TM_FILE_OVERRIDE before
 749    including defs.h, then can include any particular tm-file they desire.  */
 750
 751 /* Target machine definition.  This will be a symlink to one of the
 752    tm-*.h files, built by the `configure' script.  */
 753
 754 #ifndef TM_FILE_OVERRIDE
 755 #include "tm.h"
 756 #endif
 757
 758 /* The bit byte-order has to do just with numbering of bits in
 759    debugging symbols and such.  Conceptually, it's quite separate
 760    from byte/word byte order.  */
 761
 762 #if !defined (BITS_BIG_ENDIAN)
 763 #if TARGET_BYTE_ORDER == BIG_ENDIAN
 764 #define BITS_BIG_ENDIAN 1
 765 #endif /* Big endian.  */
 766
 767 #if TARGET_BYTE_ORDER == LITTLE_ENDIAN
 768 #define BITS_BIG_ENDIAN 0
 769 #endif /* Little endian.  */
 770 #endif /* BITS_BIG_ENDIAN not defined.  */
 771
 772 /* Swap LEN bytes at BUFFER between target and host byte-order.  */
 773 #if TARGET_BYTE_ORDER == HOST_BYTE_ORDER
 774 #define SWAP_TARGET_AND_HOST(buffer,len)
 775 #else /* Target and host byte order differ.  */
 776 #define SWAP_TARGET_AND_HOST(buffer,len) \
 777   {                                                                      \
 778     char tmp;                                                            \
 779     char *p = (char *)(buffer);                                          \
 780     char *q = ((char *)(buffer)) + len - 1;                              \
 781     for (; p < q; p++, q--)                                              \
 782       {                                                                  \
 783         tmp = *q;                                                        \
 784         *q = *p;                                                         \
 785         *p = tmp;                                                        \
 786       }                                                                  \
 787   }
 788 #endif /* Target and host byte order differ.  */
 789
 790 /* On some machines there are bits in addresses which are not really
 791    part of the address, but are used by the kernel, the hardware, etc.
 792    for special purposes.  ADDR_BITS_REMOVE takes out any such bits
 793    so we get a "real" address such as one would find in a symbol
 794    table.  ADDR_BITS_SET sets those bits the way the system wants
 795    them.  */
 796 #if !defined (ADDR_BITS_REMOVE)
 797 #define ADDR_BITS_REMOVE(addr) (addr)
 798 #define ADDR_BITS_SET(addr) (addr)
 799 #endif /* No ADDR_BITS_REMOVE.  */
 800
 801 /* From valops.c */
 802
 803 extern CORE_ADDR
 804 push_bytes PARAMS ((CORE_ADDR, char *, int));
 805
 806 /* In some modules, we don't have a definition of REGISTER_TYPE yet, so we
 807    must avoid prototyping this function for now.  FIXME.  Should be:
 808 extern CORE_ADDR
 809 push_word PARAMS ((CORE_ADDR, REGISTER_TYPE));
 810  */
 811 extern CORE_ADDR
 812 push_word ();
 813
 814 /* Some parts of gdb might be considered optional, in the sense that they
 815    are not essential for being able to build a working, usable debugger
 816    for a specific environment.  For example, the maintenance commands
 817    are there for the benefit of gdb maintainers.  As another example,
 818    some environments really don't need gdb's that are able to read N
 819    different object file formats.  In order to make it possible (but
 820    not necessarily recommended) to build "stripped down" versions of
 821    gdb, the following defines control selective compilation of those
 822    parts of gdb which can be safely left out when necessary.  Note that
 823    the default is to include everything. */
 824
 825 #ifndef MAINTENANCE_CMDS
 826 #define MAINTENANCE_CMDS 1
 827 #endif
 828
 829 #endif /* !defined (DEFS_H) */