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 \f
 362 /* Host machine definition.  This will be a symlink to one of the
 363    xm-*.h files, built by the `configure' script.  */
 364
 365 #include "xm.h"
 366
 367 /* Native machine support.  This will be a symlink to one of the
 368    nm-*.h files, built by the `configure' script.  */
 369
 370 #include "nm.h"
 371
 372 /* If the xm.h file did not define the mode string used to open the
 373    files, assume that binary files are opened the same way as text
 374    files */
 375 #ifndef FOPEN_RB
 376 #include "fopen-same.h"
 377 #endif
 378
 379 /*
 380  * Allow things in gdb to be declared "const".  If compiling ANSI, it
 381  * just works.  If compiling with gcc but non-ansi, redefine to __const__.
 382  * If non-ansi, non-gcc, then eliminate "const" entirely, making those
 383  * objects be read-write rather than read-only.
 384  */
 385
 386 #ifndef const
 387 #ifndef __STDC__
 388 # ifdef __GNUC__
 389 #  define const __const__
 390 # else
 391 #  define const /*nothing*/
 392 # endif /* GNUC */
 393 #endif /* STDC */
 394 #endif /* const */
 395
 396 #ifndef volatile
 397 #ifndef __STDC__
 398 # ifdef __GNUC__
 399 #  define volatile __volatile__
 400 # else
 401 #  define volatile /*nothing*/
 402 # endif /* GNUC */
 403 #endif /* STDC */
 404 #endif /* volatile */
 405
 406 /* Some compilers (many AT&T SVR4 compilers for instance), do not accept
 407    declarations of functions that never return (exit for instance) as
 408    "volatile void".  For such compilers "NORETURN" can be defined away
 409    to keep them happy */
 410
 411 #ifndef NORETURN
 412 # ifdef __lucid
 413 #   define NORETURN /*nothing*/
 414 # else
 415 #   define NORETURN volatile
 416 # endif
 417 #endif
 418
 419 /* Defaults for system-wide constants (if not defined by xm.h, we fake it).  */
 420
 421 #if !defined (UINT_MAX)
 422 #define UINT_MAX 0xffffffff
 423 #endif
 424
 425 #if !defined (LONG_MAX)
 426 #define LONG_MAX 0x7fffffff
 427 #endif
 428
 429 #if !defined (INT_MAX)
 430 #define INT_MAX 0x7fffffff
 431 #endif
 432
 433 #if !defined (INT_MIN)
 434 /* Two's complement, 32 bit.  */
 435 #define INT_MIN -0x80000000
 436 #endif
 437
 438 /* Number of bits in a char or unsigned char for the target machine.
 439    Just like CHAR_BIT in <limits.h> but describes the target machine.  */
 440 #if !defined (TARGET_CHAR_BIT)
 441 #define TARGET_CHAR_BIT 8
 442 #endif
 443
 444 /* Number of bits in a short or unsigned short for the target machine. */
 445 #if !defined (TARGET_SHORT_BIT)
 446 #define TARGET_SHORT_BIT (sizeof (short) * TARGET_CHAR_BIT)
 447 #endif
 448
 449 /* Number of bits in an int or unsigned int for the target machine. */
 450 #if !defined (TARGET_INT_BIT)
 451 #define TARGET_INT_BIT (sizeof (int) * TARGET_CHAR_BIT)
 452 #endif
 453
 454 /* Number of bits in a long or unsigned long for the target machine. */
 455 #if !defined (TARGET_LONG_BIT)
 456 #define TARGET_LONG_BIT (sizeof (long) * TARGET_CHAR_BIT)
 457 #endif
 458
 459 /* Number of bits in a long long or unsigned long long for the target machine. */
 460 #if !defined (TARGET_LONG_LONG_BIT)
 461 #define TARGET_LONG_LONG_BIT (2 * TARGET_LONG_BIT)
 462 #endif
 463
 464 /* Number of bits in a float for the target machine. */
 465 #if !defined (TARGET_FLOAT_BIT)
 466 #define TARGET_FLOAT_BIT (sizeof (float) * TARGET_CHAR_BIT)
 467 #endif
 468
 469 /* Number of bits in a double for the target machine. */
 470 #if !defined (TARGET_DOUBLE_BIT)
 471 #define TARGET_DOUBLE_BIT (sizeof (double) * TARGET_CHAR_BIT)
 472 #endif
 473
 474 /* Number of bits in a long double for the target machine. */
 475 #if !defined (TARGET_LONG_DOUBLE_BIT)
 476 #define TARGET_LONG_DOUBLE_BIT (2 * TARGET_DOUBLE_BIT)
 477 #endif
 478
 479 /* Number of bits in a "complex" for the target machine. */
 480 #if !defined (TARGET_COMPLEX_BIT)
 481 #define TARGET_COMPLEX_BIT (2 * TARGET_FLOAT_BIT)
 482 #endif
 483
 484 /* Number of bits in a "double complex" for the target machine. */
 485 #if !defined (TARGET_DOUBLE_COMPLEX_BIT)
 486 #define TARGET_DOUBLE_COMPLEX_BIT (2 * TARGET_DOUBLE_BIT)
 487 #endif
 488
 489 /* Number of bits in a pointer for the target machine */
 490 #if !defined (TARGET_PTR_BIT)
 491 #define TARGET_PTR_BIT TARGET_INT_BIT
 492 #endif
 493
 494 /* Convert a LONGEST to an int.  This is used in contexts (e.g. number
 495    of arguments to a function, number in a value history, register
 496    number, etc.) where the value must not be larger than can fit
 497    in an int.  */
 498 #if !defined (longest_to_int)
 499 #if defined (LONG_LONG)
 500 #define longest_to_int(x) (((x) > INT_MAX || (x) < INT_MIN) \
 501                            ? (error ("Value out of range."),0) : (int) (x))
 502 #else /* No LONG_LONG.  */
 503 /* Assume sizeof (int) == sizeof (long).  */
 504 #define longest_to_int(x) ((int) (x))
 505 #endif /* No LONG_LONG.  */
 506 #endif /* No longest_to_int.  */
 507
 508 /* This should not be a typedef, because "unsigned LONGEST" needs
 509    to work. LONG_LONG is defined if the host has "long long".  */
 510
 511 #ifndef LONGEST
 512 # ifdef LONG_LONG
 513 #  define LONGEST long long
 514 # else
 515 #  define LONGEST long
 516 # endif
 517 #endif
 518
 519 /* Assorted functions we can declare, now that const and volatile are
 520    defined.  */
 521
 522 extern char *
 523 savestring PARAMS ((const char *, int));
 524
 525 extern char *
 526 msavestring PARAMS ((void *, const char *, int));
 527
 528 extern char *
 529 strsave PARAMS ((const char *));
 530
 531 extern char *
 532 mstrsave PARAMS ((void *, const char *));
 533
 534 extern char *
 535 concat PARAMS ((char *, ...));
 536
 537 extern PTR
 538 xmalloc PARAMS ((long));
 539
 540 extern PTR
 541 xrealloc PARAMS ((PTR, long));
 542
 543 extern PTR
 544 xmmalloc PARAMS ((PTR, long));
 545
 546 extern PTR
 547 xmrealloc PARAMS ((PTR, PTR, long));
 548
 549 extern PTR
 550 mmalloc PARAMS ((PTR, long));
 551
 552 extern PTR
 553 mrealloc PARAMS ((PTR, PTR, long));
 554
 555 extern void
 556 mfree PARAMS ((PTR, PTR));
 557
 558 extern int
 559 mmcheck PARAMS ((PTR, void (*) (void)));
 560
 561 extern int
 562 mmtrace PARAMS ((void));
 563
 564 extern int
 565 parse_escape PARAMS ((char **));
 566
 567 extern const char * const reg_names[];
 568
 569 extern NORETURN void                    /* Does not return to the caller.  */
 570 error ();
 571
 572 extern NORETURN void                    /* Does not return to the caller.  */
 573 fatal ();
 574
 575 extern NORETURN void                    /* Not specified as volatile in ... */
 576 exit PARAMS ((int));                    /* 4.10.4.3 */
 577
 578 extern NORETURN void                    /* Does not return to the caller.  */
 579 nomem PARAMS ((long));
 580
 581 extern NORETURN void                    /* Does not return to the caller.  */
 582 return_to_top_level PARAMS ((void));
 583
 584 extern void
 585 warning_setup PARAMS ((void));
 586
 587 extern void
 588 warning ();
 589
 590 /* Global functions from other, non-gdb GNU thingies (libiberty for
 591    instance) */
 592
 593 extern char *
 594 basename PARAMS ((char *));
 595
 596 extern char *
 597 getenv PARAMS ((const char *));
 598
 599 extern char **
 600 buildargv PARAMS ((char *));
 601
 602 extern void
 603 freeargv PARAMS ((char **));
 604
 605 extern char *
 606 strerrno PARAMS ((int));
 607
 608 extern char *
 609 strsigno PARAMS ((int));
 610
 611 extern int
 612 errno_max PARAMS ((void));
 613
 614 extern int
 615 signo_max PARAMS ((void));
 616
 617 extern int
 618 strtoerrno PARAMS ((char *));
 619
 620 extern int
 621 strtosigno PARAMS ((char *));
 622
 623 extern char *
 624 strsignal PARAMS ((int));
 625
 626 /* From other system libraries */
 627
 628 #ifndef PSIGNAL_IN_SIGNAL_H
 629 extern void
 630 psignal PARAMS ((unsigned, char *));
 631 #endif
 632
 633 /* For now, we can't include <stdlib.h> because it conflicts with
 634    "../include/getopt.h".  (FIXME)
 635
 636    However, if a function is defined in the ANSI C standard and a prototype
 637    for that function is defined and visible in any header file in an ANSI
 638    conforming environment, then that prototype must match the definition in
 639    the ANSI standard.  So we can just duplicate them here without conflict,
 640    since they must be the same in all conforming ANSI environments.  If
 641    these cause problems, then the environment is not ANSI conformant. */
 642
 643 #ifdef __STDC__
 644 #include <stddef.h>
 645 #endif
 646
 647 extern int
 648 fclose PARAMS ((FILE *stream));                         /* 4.9.5.1 */
 649
 650 extern void
 651 perror PARAMS ((const char *));                         /* 4.9.10.4 */
 652
 653 extern double
 654 atof PARAMS ((const char *nptr));                       /* 4.10.1.1 */
 655
 656 extern int
 657 atoi PARAMS ((const char *));                           /* 4.10.1.2 */
 658
 659 #ifndef MALLOC_INCOMPATIBLE
 660
 661 extern PTR
 662 malloc PARAMS ((size_t size));                          /* 4.10.3.3 */
 663
 664 extern PTR
 665 realloc PARAMS ((void *ptr, size_t size));              /* 4.10.3.4 */
 666
 667 extern void
 668 free PARAMS ((void *));                                 /* 4.10.3.2 */
 669
 670 #endif  /* MALLOC_INCOMPATIBLE */
 671
 672 extern void
 673 qsort PARAMS ((void *base, size_t nmemb,                /* 4.10.5.2 */
 674                size_t size,
 675                int (*comp)(const void *, const void *)));
 676
 677 #ifndef MEM_FNS_DECLARED        /* Some non-ANSI use void *, not char *.  */
 678 extern PTR
 679 memcpy PARAMS ((void *, const void *, size_t));         /* 4.11.2.1 */
 680 #endif
 681
 682 extern int
 683 memcmp PARAMS ((const void *, const void *, size_t));   /* 4.11.4.1 */
 684
 685 extern char *
 686 strchr PARAMS ((const char *, int));                    /* 4.11.5.2 */
 687
 688 extern char *
 689 strrchr PARAMS ((const char *, int));                   /* 4.11.5.5 */
 690
 691 extern char *
 692 strstr PARAMS ((const char *, const char *));           /* 4.11.5.7 */
 693
 694 extern char *
 695 strtok PARAMS ((char *, const char *));                 /* 4.11.5.8 */
 696
 697 #ifndef MEM_FNS_DECLARED        /* Some non-ANSI use void *, not char *.  */
 698 extern PTR
 699 memset PARAMS ((void *, int, size_t));                  /* 4.11.6.1 */
 700 #endif
 701
 702 extern char *
 703 strerror PARAMS ((int));                                /* 4.11.6.2 */
 704
 705 /* Various possibilities for alloca.  */
 706 #ifndef alloca
 707 # ifdef __GNUC__
 708 #  define alloca __builtin_alloca
 709 # else
 710 #  ifdef sparc
 711 #   include <alloca.h>          /* NOTE:  Doesn't declare alloca() */
 712 #  endif
 713 #  ifdef __STDC__
 714    extern void *alloca (size_t);
 715 #  else /* __STDC__ */
 716    extern char *alloca ();
 717 #  endif
 718 # endif
 719 #endif
 720
 721 /* TARGET_BYTE_ORDER and HOST_BYTE_ORDER must be defined to one of these.  */
 722
 723 #if !defined (BIG_ENDIAN)
 724 #define BIG_ENDIAN 4321
 725 #endif
 726
 727 #if !defined (LITTLE_ENDIAN)
 728 #define LITTLE_ENDIAN 1234
 729 #endif
 730
 731 /* Target-system-dependent parameters for GDB.
 732
 733    The standard thing is to include defs.h.  However, files that are
 734    specific to a particular target can define TM_FILE_OVERRIDE before
 735    including defs.h, then can include any particular tm-file they desire.  */
 736
 737 /* Target machine definition.  This will be a symlink to one of the
 738    tm-*.h files, built by the `configure' script.  */
 739
 740 #ifndef TM_FILE_OVERRIDE
 741 #include "tm.h"
 742 #endif
 743
 744 /* The bit byte-order has to do just with numbering of bits in
 745    debugging symbols and such.  Conceptually, it's quite separate
 746    from byte/word byte order.  */
 747
 748 #if !defined (BITS_BIG_ENDIAN)
 749 #if TARGET_BYTE_ORDER == BIG_ENDIAN
 750 #define BITS_BIG_ENDIAN 1
 751 #endif /* Big endian.  */
 752
 753 #if TARGET_BYTE_ORDER == LITTLE_ENDIAN
 754 #define BITS_BIG_ENDIAN 0
 755 #endif /* Little endian.  */
 756 #endif /* BITS_BIG_ENDIAN not defined.  */
 757
 758 /* Swap LEN bytes at BUFFER between target and host byte-order.  */
 759 #if TARGET_BYTE_ORDER == HOST_BYTE_ORDER
 760 #define SWAP_TARGET_AND_HOST(buffer,len)
 761 #else /* Target and host byte order differ.  */
 762 #define SWAP_TARGET_AND_HOST(buffer,len) \
 763   {                                                                      \
 764     char tmp;                                                            \
 765     char *p = (char *)(buffer);                                          \
 766     char *q = ((char *)(buffer)) + len - 1;                              \
 767     for (; p < q; p++, q--)                                              \
 768       {                                                                  \
 769         tmp = *q;                                                        \
 770         *q = *p;                                                         \
 771         *p = tmp;                                                        \
 772       }                                                                  \
 773   }
 774 #endif /* Target and host byte order differ.  */
 775
 776 /* On some machines there are bits in addresses which are not really
 777    part of the address, but are used by the kernel, the hardware, etc.
 778    for special purposes.  ADDR_BITS_REMOVE takes out any such bits
 779    so we get a "real" address such as one would find in a symbol
 780    table.  ADDR_BITS_SET sets those bits the way the system wants
 781    them.  */
 782 #if !defined (ADDR_BITS_REMOVE)
 783 #define ADDR_BITS_REMOVE(addr) (addr)
 784 #define ADDR_BITS_SET(addr) (addr)
 785 #endif /* No ADDR_BITS_REMOVE.  */
 786
 787 /* From valops.c */
 788
 789 extern CORE_ADDR
 790 push_bytes PARAMS ((CORE_ADDR, char *, int));
 791
 792 /* In some modules, we don't have a definition of REGISTER_TYPE yet, so we
 793    must avoid prototyping this function for now.  FIXME.  Should be:
 794 extern CORE_ADDR
 795 push_word PARAMS ((CORE_ADDR, REGISTER_TYPE));
 796  */
 797 extern CORE_ADDR
 798 push_word ();
 799
 800 /* Some parts of gdb might be considered optional, in the sense that they
 801    are not essential for being able to build a working, usable debugger
 802    for a specific environment.  For example, the maintenance commands
 803    are there for the benefit of gdb maintainers.  As another example,
 804    some environments really don't need gdb's that are able to read N
 805    different object file formats.  In order to make it possible (but
 806    not necessarily recommended) to build "stripped down" versions of
 807    gdb, the following defines control selective compilation of those
 808    parts of gdb which can be safely left out when necessary.  Note that
 809    the default is to include everything. */
 810
 811 #ifndef MAINTENANCE_CMDS
 812 #define MAINTENANCE_CMDS 1
 813 #endif
 814
 815 #endif /* !defined (DEFS_H) */