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
  45 extern void
  46 quit PARAMS ((void));
  47
  48 #define QUIT { if (quit_flag) quit (); }
  49
  50 /* Command classes are top-level categories into which commands are broken
  51    down for "help" purposes.
  52    Notes on classes: class_alias is for alias commands which are not
  53    abbreviations of the original command.  class-pseudo is for commands
  54    which are not really commands nor help topics ("stop").  */
  55
  56 enum command_class
  57 {
  58   /* Special args to help_list */
  59   all_classes = -2, all_commands = -1,
  60   /* Classes of commands */
  61   no_class = -1, class_run = 0, class_vars, class_stack,
  62   class_files, class_support, class_info, class_breakpoint,
  63   class_alias, class_obscure, class_user, class_maintenance,
  64   class_pseudo
  65 };
  66
  67 /* the cleanup list records things that have to be undone
  68    if an error happens (descriptors to be closed, memory to be freed, etc.)
  69    Each link in the chain records a function to call and an
  70    argument to give it.
  71
  72    Use make_cleanup to add an element to the cleanup chain.
  73    Use do_cleanups to do all cleanup actions back to a given
  74    point in the chain.  Use discard_cleanups to remove cleanups
  75    from the chain back to a given point, not doing them.  */
  76
  77 struct cleanup
  78 {
  79   struct cleanup *next;
  80   void (*function) PARAMS ((PTR));
  81   PTR arg;
  82 };
  83
  84 /* From blockframe.c */
  85
  86 extern int
  87 inside_entry_func PARAMS ((CORE_ADDR));
  88
  89 extern int
  90 inside_entry_file PARAMS ((CORE_ADDR addr));
  91
  92 extern int
  93 inside_main_func PARAMS ((CORE_ADDR pc));
  94
  95 /* From cplus-dem.c */
  96
  97 extern char *
  98 cplus_demangle PARAMS ((const char *, int));
  99
 100 extern char *
 101 cplus_mangle_opname PARAMS ((char *, int));
 102
 103 /* From libmmalloc.a (memory mapped malloc library) */
 104
 105 extern PTR
 106 mmalloc_attach PARAMS ((int, PTR));
 107
 108 extern PTR
 109 mmalloc_detach PARAMS ((PTR));
 110
 111 extern PTR
 112 mmalloc PARAMS ((PTR, long));
 113
 114 extern PTR
 115 mrealloc PARAMS ((PTR, PTR, long));
 116
 117 extern void
 118 mfree PARAMS ((PTR, PTR));
 119
 120 extern int
 121 mmalloc_setkey PARAMS ((PTR, int, PTR));
 122
 123 extern PTR
 124 mmalloc_getkey PARAMS ((PTR, int));
 125
 126 /* From utils.c */
 127
 128 extern char *
 129 demangle_and_match PARAMS ((const char *, const char *, int));
 130
 131 extern int
 132 strcmp_iw PARAMS ((const char *, const char *));
 133
 134 extern char *
 135 safe_strerror PARAMS ((int));
 136
 137 extern char *
 138 safe_strsignal PARAMS ((int));
 139
 140 extern void
 141 init_malloc PARAMS ((PTR));
 142
 143 extern void
 144 request_quit PARAMS ((int));
 145
 146 extern void
 147 do_cleanups PARAMS ((struct cleanup *));
 148
 149 extern void
 150 discard_cleanups PARAMS ((struct cleanup *));
 151
 152 /* The bare make_cleanup function is one of those rare beasts that
 153    takes almost any type of function as the first arg and anything that
 154    will fit in a "void *" as the second arg.
 155
 156    Should be, once all calls and called-functions are cleaned up:
 157 extern struct cleanup *
 158 make_cleanup PARAMS ((void (*function) (PTR), PTR));
 159
 160    Until then, lint and/or various type-checking compiler options will
 161    complain about make_cleanup calls.  It'd be wrong to just cast things,
 162    since the type actually passed when the function is called would be
 163    wrong.  */
 164
 165 extern struct cleanup *
 166 make_cleanup ();
 167
 168 extern struct cleanup *
 169 save_cleanups PARAMS ((void));
 170
 171 extern void
 172 restore_cleanups PARAMS ((struct cleanup *));
 173
 174 extern void
 175 free_current_contents PARAMS ((char **));
 176
 177 extern void
 178 null_cleanup PARAMS ((char **));
 179
 180 extern int
 181 myread PARAMS ((int, char *, int));
 182
 183 extern int
 184 query ();
 185
 186 extern void
 187 wrap_here PARAMS ((char *));
 188
 189 extern void
 190 reinitialize_more_filter PARAMS ((void));
 191
 192 extern int
 193 print_insn PARAMS ((CORE_ADDR, FILE *));
 194
 195 extern void
 196 fputs_filtered PARAMS ((const char *, FILE *));
 197
 198 extern void
 199 puts_filtered PARAMS ((char *));
 200
 201 extern void
 202 vfprintf_filtered ();
 203
 204 extern void
 205 fprintf_filtered ();
 206
 207 extern void
 208 fprintfi_filtered ();
 209
 210 extern void
 211 printf_filtered ();
 212
 213 extern void
 214 printfi_filtered ();
 215
 216 extern void
 217 print_spaces PARAMS ((int, FILE *));
 218
 219 extern void
 220 print_spaces_filtered PARAMS ((int, FILE *));
 221
 222 extern char *
 223 n_spaces PARAMS ((int));
 224
 225 extern void
 226 printchar PARAMS ((int, FILE *, int));
 227
 228 extern char *
 229 strdup_demangled PARAMS ((const char *));
 230
 231 extern void
 232 fprint_symbol PARAMS ((FILE *, char *));
 233
 234 extern void
 235 fputs_demangled PARAMS ((char *, FILE *, int));
 236
 237 extern void
 238 perror_with_name PARAMS ((char *));
 239
 240 extern void
 241 print_sys_errmsg PARAMS ((char *, int));
 242
 243 /* From regex.c */
 244
 245 extern char *
 246 re_comp PARAMS ((char *));
 247
 248 /* From symfile.c */
 249
 250 extern void
 251 symbol_file_command PARAMS ((char *, int));
 252
 253 /* From main.c */
 254
 255 extern char *
 256 skip_quoted PARAMS ((char *));
 257
 258 extern char *
 259 gdb_readline PARAMS ((char *));
 260
 261 extern char *
 262 command_line_input PARAMS ((char *, int));
 263
 264 extern void
 265 print_prompt PARAMS ((void));
 266
 267 extern int
 268 batch_mode PARAMS ((void));
 269
 270 extern int
 271 input_from_terminal_p PARAMS ((void));
 272
 273 extern int
 274 catch_errors PARAMS ((int (*) (char *), char *, char *));
 275
 276 /* From printcmd.c */
 277
 278 extern void
 279 set_next_address PARAMS ((CORE_ADDR));
 280
 281 extern void
 282 print_address_symbolic PARAMS ((CORE_ADDR, FILE *, int, char *));
 283
 284 extern void
 285 print_address PARAMS ((CORE_ADDR, FILE *));
 286
 287 /* From source.c */
 288
 289 extern int
 290 openp PARAMS ((char *, int, char *, int, int, char **));
 291
 292 extern void
 293 mod_path PARAMS ((char *, char **));
 294
 295 extern void
 296 directory_command PARAMS ((char *, int));
 297
 298 extern void
 299 init_source_path PARAMS ((void));
 300
 301 /* From findvar.c */
 302
 303 extern int
 304 read_relative_register_raw_bytes PARAMS ((int, char *));
 305
 306 /* From readline (but not in any readline .h files).  */
 307
 308 extern char *
 309 tilde_expand PARAMS ((char *));
 310
 311 /* Structure for saved commands lines
 312    (for breakpoints, defined commands, etc).  */
 313
 314 struct command_line
 315 {
 316   struct command_line *next;
 317   char *line;
 318 };
 319
 320 extern struct command_line *
 321 read_command_lines PARAMS ((void));
 322
 323 extern void
 324 free_command_lines PARAMS ((struct command_line **));
 325
 326 /* String containing the current directory (what getwd would return).  */
 327
 328 extern char *current_directory;
 329
 330 /* Default radixes for input and output.  Only some values supported.  */
 331 extern unsigned input_radix;
 332 extern unsigned output_radix;
 333
 334 /* Baud rate specified for communication with serial target systems.  */
 335 extern char *baud_rate;
 336
 337 /* Languages represented in the symbol table and elsewhere. */
 338
 339 enum language
 340 {
 341    language_unknown,            /* Language not known */
 342    language_auto,               /* Placeholder for automatic setting */
 343    language_c,                  /* C */
 344    language_cplus,              /* C++ */
 345    language_chill,              /* Chill */
 346    language_m2                  /* Modula-2 */
 347 };
 348
 349 /* Return a format string for printf that will print a number in the local
 350    (language-specific) hexadecimal format.  Result is static and is
 351    overwritten by the next call.  local_hex_format_custom takes printf
 352    options like "08" or "l" (to produce e.g. %08x or %lx).  */
 353
 354 #define local_hex_format() (current_language->la_hex_format)
 355
 356 extern char *
 357 local_hex_format_custom PARAMS ((char *));      /* language.c */
 358
 359 /* Return a string that contains a number formatted in the local
 360    (language-specific) hexadecimal format.  Result is static and is
 361    overwritten by the next call.  local_hex_string_custom takes printf
 362    options like "08" or "l".  */
 363
 364 extern char *
 365 local_hex_string PARAMS ((int));                /* language.c */
 366
 367 extern char *
 368 local_hex_string_custom PARAMS ((int, char *)); /* language.c */
 369
 370 \f
 371 /* Host machine definition.  This will be a symlink to one of the
 372    xm-*.h files, built by the `configure' script.  */
 373
 374 #include "xm.h"
 375
 376 /* Native machine support.  This will be a symlink to one of the
 377    nm-*.h files, built by the `configure' script.  */
 378
 379 #include "nm.h"
 380
 381 /* If the xm.h file did not define the mode string used to open the
 382    files, assume that binary files are opened the same way as text
 383    files */
 384 #ifndef FOPEN_RB
 385 #include "fopen-same.h"
 386 #endif
 387
 388 /*
 389  * Allow things in gdb to be declared "const".  If compiling ANSI, it
 390  * just works.  If compiling with gcc but non-ansi, redefine to __const__.
 391  * If non-ansi, non-gcc, then eliminate "const" entirely, making those
 392  * objects be read-write rather than read-only.
 393  */
 394
 395 #ifndef const
 396 #ifndef __STDC__
 397 # ifdef __GNUC__
 398 #  define const __const__
 399 # else
 400 #  define const /*nothing*/
 401 # endif /* GNUC */
 402 #endif /* STDC */
 403 #endif /* const */
 404
 405 #ifndef volatile
 406 #ifndef __STDC__
 407 # ifdef __GNUC__
 408 #  define volatile __volatile__
 409 # else
 410 #  define volatile /*nothing*/
 411 # endif /* GNUC */
 412 #endif /* STDC */
 413 #endif /* volatile */
 414
 415 /* Some compilers (many AT&T SVR4 compilers for instance), do not accept
 416    declarations of functions that never return (exit for instance) as
 417    "volatile void".  For such compilers "NORETURN" can be defined away
 418    to keep them happy */
 419
 420 #ifndef NORETURN
 421 # ifdef __lucid
 422 #   define NORETURN /*nothing*/
 423 # else
 424 #   define NORETURN volatile
 425 # endif
 426 #endif
 427
 428 /* Defaults for system-wide constants (if not defined by xm.h, we fake it).  */
 429
 430 #if !defined (UINT_MAX)
 431 #define UINT_MAX 0xffffffff
 432 #endif
 433
 434 #if !defined (LONG_MAX)
 435 #define LONG_MAX 0x7fffffff
 436 #endif
 437
 438 #if !defined (INT_MAX)
 439 #define INT_MAX 0x7fffffff
 440 #endif
 441
 442 #if !defined (INT_MIN)
 443 /* Two's complement, 32 bit.  */
 444 #define INT_MIN -0x80000000
 445 #endif
 446
 447 /* Number of bits in a char or unsigned char for the target machine.
 448    Just like CHAR_BIT in <limits.h> but describes the target machine.  */
 449 #if !defined (TARGET_CHAR_BIT)
 450 #define TARGET_CHAR_BIT 8
 451 #endif
 452
 453 /* Number of bits in a short or unsigned short for the target machine. */
 454 #if !defined (TARGET_SHORT_BIT)
 455 #define TARGET_SHORT_BIT (sizeof (short) * TARGET_CHAR_BIT)
 456 #endif
 457
 458 /* Number of bits in an int or unsigned int for the target machine. */
 459 #if !defined (TARGET_INT_BIT)
 460 #define TARGET_INT_BIT (sizeof (int) * TARGET_CHAR_BIT)
 461 #endif
 462
 463 /* Number of bits in a long or unsigned long for the target machine. */
 464 #if !defined (TARGET_LONG_BIT)
 465 #define TARGET_LONG_BIT (sizeof (long) * TARGET_CHAR_BIT)
 466 #endif
 467
 468 /* Number of bits in a long long or unsigned long long for the target machine. */
 469 #if !defined (TARGET_LONG_LONG_BIT)
 470 #define TARGET_LONG_LONG_BIT (2 * TARGET_LONG_BIT)
 471 #endif
 472
 473 /* Number of bits in a float for the target machine. */
 474 #if !defined (TARGET_FLOAT_BIT)
 475 #define TARGET_FLOAT_BIT (sizeof (float) * TARGET_CHAR_BIT)
 476 #endif
 477
 478 /* Number of bits in a double for the target machine. */
 479 #if !defined (TARGET_DOUBLE_BIT)
 480 #define TARGET_DOUBLE_BIT (sizeof (double) * TARGET_CHAR_BIT)
 481 #endif
 482
 483 /* Number of bits in a long double for the target machine. */
 484 #if !defined (TARGET_LONG_DOUBLE_BIT)
 485 #define TARGET_LONG_DOUBLE_BIT (2 * TARGET_DOUBLE_BIT)
 486 #endif
 487
 488 /* Number of bits in a "complex" for the target machine. */
 489 #if !defined (TARGET_COMPLEX_BIT)
 490 #define TARGET_COMPLEX_BIT (2 * TARGET_FLOAT_BIT)
 491 #endif
 492
 493 /* Number of bits in a "double complex" for the target machine. */
 494 #if !defined (TARGET_DOUBLE_COMPLEX_BIT)
 495 #define TARGET_DOUBLE_COMPLEX_BIT (2 * TARGET_DOUBLE_BIT)
 496 #endif
 497
 498 /* Number of bits in a pointer for the target machine */
 499 #if !defined (TARGET_PTR_BIT)
 500 #define TARGET_PTR_BIT TARGET_INT_BIT
 501 #endif
 502
 503 /* Convert a LONGEST to an int.  This is used in contexts (e.g. number
 504    of arguments to a function, number in a value history, register
 505    number, etc.) where the value must not be larger than can fit
 506    in an int.  */
 507 #if !defined (longest_to_int)
 508 #if defined (LONG_LONG)
 509 #define longest_to_int(x) (((x) > INT_MAX || (x) < INT_MIN) \
 510                            ? (error ("Value out of range."),0) : (int) (x))
 511 #else /* No LONG_LONG.  */
 512 /* Assume sizeof (int) == sizeof (long).  */
 513 #define longest_to_int(x) ((int) (x))
 514 #endif /* No LONG_LONG.  */
 515 #endif /* No longest_to_int.  */
 516
 517 /* This should not be a typedef, because "unsigned LONGEST" needs
 518    to work. LONG_LONG is defined if the host has "long long".  */
 519
 520 #ifndef LONGEST
 521 # ifdef LONG_LONG
 522 #  define LONGEST long long
 523 # else
 524 #  define LONGEST long
 525 # endif
 526 #endif
 527
 528 /* Assorted functions we can declare, now that const and volatile are
 529    defined.  */
 530
 531 extern char *
 532 savestring PARAMS ((const char *, int));
 533
 534 extern char *
 535 msavestring PARAMS ((void *, const char *, int));
 536
 537 extern char *
 538 strsave PARAMS ((const char *));
 539
 540 extern char *
 541 mstrsave PARAMS ((void *, const char *));
 542
 543 extern char *
 544 concat PARAMS ((char *, ...));
 545
 546 extern PTR
 547 xmalloc PARAMS ((long));
 548
 549 extern PTR
 550 xrealloc PARAMS ((PTR, long));
 551
 552 extern PTR
 553 xmmalloc PARAMS ((PTR, long));
 554
 555 extern PTR
 556 xmrealloc PARAMS ((PTR, PTR, long));
 557
 558 extern PTR
 559 mmalloc PARAMS ((PTR, long));
 560
 561 extern PTR
 562 mrealloc PARAMS ((PTR, PTR, long));
 563
 564 extern void
 565 mfree PARAMS ((PTR, PTR));
 566
 567 extern int
 568 mmcheck PARAMS ((PTR, void (*) (void)));
 569
 570 extern int
 571 mmtrace PARAMS ((void));
 572
 573 extern int
 574 parse_escape PARAMS ((char **));
 575
 576 extern const char * const reg_names[];
 577
 578 extern NORETURN void                    /* Does not return to the caller.  */
 579 error ();
 580
 581 extern NORETURN void                    /* Does not return to the caller.  */
 582 fatal ();
 583
 584 extern NORETURN void                    /* Not specified as volatile in ... */
 585 exit PARAMS ((int));                    /* 4.10.4.3 */
 586
 587 extern NORETURN void                    /* Does not return to the caller.  */
 588 nomem PARAMS ((long));
 589
 590 extern NORETURN void                    /* Does not return to the caller.  */
 591 return_to_top_level PARAMS ((void));
 592
 593 extern void
 594 warning_setup PARAMS ((void));
 595
 596 extern void
 597 warning ();
 598
 599 /* Global functions from other, non-gdb GNU thingies (libiberty for
 600    instance) */
 601
 602 extern char *
 603 basename PARAMS ((char *));
 604
 605 extern char *
 606 getenv PARAMS ((const char *));
 607
 608 extern char **
 609 buildargv PARAMS ((char *));
 610
 611 extern void
 612 freeargv PARAMS ((char **));
 613
 614 extern char *
 615 strerrno PARAMS ((int));
 616
 617 extern char *
 618 strsigno PARAMS ((int));
 619
 620 extern int
 621 errno_max PARAMS ((void));
 622
 623 extern int
 624 signo_max PARAMS ((void));
 625
 626 extern int
 627 strtoerrno PARAMS ((char *));
 628
 629 extern int
 630 strtosigno PARAMS ((char *));
 631
 632 extern char *
 633 strsignal PARAMS ((int));
 634
 635 /* From other system libraries */
 636
 637 #ifndef PSIGNAL_IN_SIGNAL_H
 638 extern void
 639 psignal PARAMS ((unsigned, char *));
 640 #endif
 641
 642 /* For now, we can't include <stdlib.h> because it conflicts with
 643    "../include/getopt.h".  (FIXME)
 644
 645    However, if a function is defined in the ANSI C standard and a prototype
 646    for that function is defined and visible in any header file in an ANSI
 647    conforming environment, then that prototype must match the definition in
 648    the ANSI standard.  So we can just duplicate them here without conflict,
 649    since they must be the same in all conforming ANSI environments.  If
 650    these cause problems, then the environment is not ANSI conformant. */
 651
 652 #ifdef __STDC__
 653 #include <stddef.h>
 654 #endif
 655
 656 extern int
 657 fclose PARAMS ((FILE *stream));                         /* 4.9.5.1 */
 658
 659 extern void
 660 perror PARAMS ((const char *));                         /* 4.9.10.4 */
 661
 662 extern double
 663 atof PARAMS ((const char *nptr));                       /* 4.10.1.1 */
 664
 665 extern int
 666 atoi PARAMS ((const char *));                           /* 4.10.1.2 */
 667
 668 #ifndef MALLOC_INCOMPATIBLE
 669
 670 extern PTR
 671 malloc PARAMS ((size_t size));                          /* 4.10.3.3 */
 672
 673 extern PTR
 674 realloc PARAMS ((void *ptr, size_t size));              /* 4.10.3.4 */
 675
 676 extern void
 677 free PARAMS ((void *));                                 /* 4.10.3.2 */
 678
 679 #endif  /* MALLOC_INCOMPATIBLE */
 680
 681 extern void
 682 qsort PARAMS ((void *base, size_t nmemb,                /* 4.10.5.2 */
 683                size_t size,
 684                int (*comp)(const void *, const void *)));
 685
 686 #ifndef MEM_FNS_DECLARED        /* Some non-ANSI use void *, not char *.  */
 687 extern PTR
 688 memcpy PARAMS ((void *, const void *, size_t));         /* 4.11.2.1 */
 689 #endif
 690
 691 extern int
 692 memcmp PARAMS ((const void *, const void *, size_t));   /* 4.11.4.1 */
 693
 694 extern char *
 695 strchr PARAMS ((const char *, int));                    /* 4.11.5.2 */
 696
 697 extern char *
 698 strrchr PARAMS ((const char *, int));                   /* 4.11.5.5 */
 699
 700 extern char *
 701 strstr PARAMS ((const char *, const char *));           /* 4.11.5.7 */
 702
 703 extern char *
 704 strtok PARAMS ((char *, const char *));                 /* 4.11.5.8 */
 705
 706 #ifndef MEM_FNS_DECLARED        /* Some non-ANSI use void *, not char *.  */
 707 extern PTR
 708 memset PARAMS ((void *, int, size_t));                  /* 4.11.6.1 */
 709 #endif
 710
 711 extern char *
 712 strerror PARAMS ((int));                                /* 4.11.6.2 */
 713
 714 /* Various possibilities for alloca.  */
 715 #ifndef alloca
 716 # ifdef __GNUC__
 717 #  define alloca __builtin_alloca
 718 # else
 719 #  ifdef sparc
 720 #   include <alloca.h>          /* NOTE:  Doesn't declare alloca() */
 721 #  endif
 722 #  ifdef __STDC__
 723    extern void *alloca (size_t);
 724 #  else /* __STDC__ */
 725    extern char *alloca ();
 726 #  endif
 727 # endif
 728 #endif
 729
 730 /* TARGET_BYTE_ORDER and HOST_BYTE_ORDER must be defined to one of these.  */
 731
 732 #if !defined (BIG_ENDIAN)
 733 #define BIG_ENDIAN 4321
 734 #endif
 735
 736 #if !defined (LITTLE_ENDIAN)
 737 #define LITTLE_ENDIAN 1234
 738 #endif
 739
 740 /* Target-system-dependent parameters for GDB.
 741
 742    The standard thing is to include defs.h.  However, files that are
 743    specific to a particular target can define TM_FILE_OVERRIDE before
 744    including defs.h, then can include any particular tm-file they desire.  */
 745
 746 /* Target machine definition.  This will be a symlink to one of the
 747    tm-*.h files, built by the `configure' script.  */
 748
 749 #ifndef TM_FILE_OVERRIDE
 750 #include "tm.h"
 751 #endif
 752
 753 /* The bit byte-order has to do just with numbering of bits in
 754    debugging symbols and such.  Conceptually, it's quite separate
 755    from byte/word byte order.  */
 756
 757 #if !defined (BITS_BIG_ENDIAN)
 758 #if TARGET_BYTE_ORDER == BIG_ENDIAN
 759 #define BITS_BIG_ENDIAN 1
 760 #endif /* Big endian.  */
 761
 762 #if TARGET_BYTE_ORDER == LITTLE_ENDIAN
 763 #define BITS_BIG_ENDIAN 0
 764 #endif /* Little endian.  */
 765 #endif /* BITS_BIG_ENDIAN not defined.  */
 766
 767 /* Swap LEN bytes at BUFFER between target and host byte-order.  */
 768 #if TARGET_BYTE_ORDER == HOST_BYTE_ORDER
 769 #define SWAP_TARGET_AND_HOST(buffer,len)
 770 #else /* Target and host byte order differ.  */
 771 #define SWAP_TARGET_AND_HOST(buffer,len) \
 772   {                                                                      \
 773     char tmp;                                                            \
 774     char *p = (char *)(buffer);                                          \
 775     char *q = ((char *)(buffer)) + len - 1;                              \
 776     for (; p < q; p++, q--)                                              \
 777       {                                                                  \
 778         tmp = *q;                                                        \
 779         *q = *p;                                                         \
 780         *p = tmp;                                                        \
 781       }                                                                  \
 782   }
 783 #endif /* Target and host byte order differ.  */
 784
 785 /* On some machines there are bits in addresses which are not really
 786    part of the address, but are used by the kernel, the hardware, etc.
 787    for special purposes.  ADDR_BITS_REMOVE takes out any such bits
 788    so we get a "real" address such as one would find in a symbol
 789    table.  ADDR_BITS_SET sets those bits the way the system wants
 790    them.  */
 791 #if !defined (ADDR_BITS_REMOVE)
 792 #define ADDR_BITS_REMOVE(addr) (addr)
 793 #define ADDR_BITS_SET(addr) (addr)
 794 #endif /* No ADDR_BITS_REMOVE.  */
 795
 796 /* From valops.c */
 797
 798 extern CORE_ADDR
 799 push_bytes PARAMS ((CORE_ADDR, char *, int));
 800
 801 /* In some modules, we don't have a definition of REGISTER_TYPE yet, so we
 802    must avoid prototyping this function for now.  FIXME.  Should be:
 803 extern CORE_ADDR
 804 push_word PARAMS ((CORE_ADDR, REGISTER_TYPE));
 805  */
 806 extern CORE_ADDR
 807 push_word ();
 808
 809 /* Some parts of gdb might be considered optional, in the sense that they
 810    are not essential for being able to build a working, usable debugger
 811    for a specific environment.  For example, the maintenance commands
 812    are there for the benefit of gdb maintainers.  As another example,
 813    some environments really don't need gdb's that are able to read N
 814    different object file formats.  In order to make it possible (but
 815    not necessarily recommended) to build "stripped down" versions of
 816    gdb, the following defines control selective compilation of those
 817    parts of gdb which can be safely left out when necessary.  Note that
 818    the default is to include everything. */
 819
 820 #ifndef MAINTENANCE_CMDS
 821 #define MAINTENANCE_CMDS 1
 822 #endif
 823
 824 #endif /* !defined (DEFS_H) */