* serial.h (SERIAL_SET_TTY_STATE): Comment return value.

[deliverable/binutils-gdb.git] / gdb / defs.h

/* Basic, host-specific, and target-specific definitions for GDB.
   Copyright (C) 1986, 1989, 1991 Free Software Foundation, Inc.

This file is part of GDB.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#if !defined (DEFS_H)
#define DEFS_H 1

#include <stdio.h>

/* First include ansidecl.h so we can use the various macro definitions
   here and in all subsequent file inclusions.  */

#include "ansidecl.h"

/* An address in the program being debugged.  Host byte order.  */
#ifndef CORE_ADDR_TYPE
typedef unsigned int CORE_ADDR;
#else
typedef CORE_ADDR_TYPE CORE_ADDR;
#endif

#define min(a, b) ((a) < (b) ? (a) : (b))
#define max(a, b) ((a) > (b) ? (a) : (b))

/* Gdb does *lots* of string compares.  Use macros to speed them up by
   avoiding function calls if the first characters are not the same. */

#define STRCMP(a,b) (*(a) == *(b) ? strcmp ((a), (b)) : (int)*(a) - (int)*(b))
#define STREQ(a,b) (*(a) == *(b) ? !strcmp ((a), (b)) : 0)
#define STREQN(a,b,c) (*(a) == *(b) ? !strncmp ((a), (b), (c)) : 0)

/* The character GNU C++ uses to build identifiers that must be unique from
   the program's identifiers (such as $this and $$vptr).  */
#define CPLUS_MARKER '$'	/* May be overridden to '.' for SysV */

#include <errno.h>		/* System call error return status */

extern int quit_flag;
extern int immediate_quit;
extern int sevenbit_strings;

extern void
quit PARAMS ((void));

#define QUIT { if (quit_flag) quit (); }

/* Command classes are top-level categories into which commands are broken
   down for "help" purposes.  
   Notes on classes: class_alias is for alias commands which are not
   abbreviations of the original command.  class-pseudo is for commands
   which are not really commands nor help topics ("stop").  */

enum command_class
{
  /* Special args to help_list */
  all_classes = -2, all_commands = -1,
  /* Classes of commands */
  no_class = -1, class_run = 0, class_vars, class_stack,
  class_files, class_support, class_info, class_breakpoint,
  class_alias, class_obscure, class_user, class_maintenance,
  class_pseudo
};

/* Languages represented in the symbol table and elsewhere.
   This should probably be in language.h, but since enum's can't
   be forward declared to satisfy opaque references before their
   actual definition, needs to be here. */

enum language 
{
   language_unknown, 		/* Language not known */
   language_auto,		/* Placeholder for automatic setting */
   language_c, 			/* C */
   language_cplus, 		/* C++ */
   language_chill,		/* Chill */
   language_m2			/* Modula-2 */
};

/* the cleanup list records things that have to be undone
   if an error happens (descriptors to be closed, memory to be freed, etc.)
   Each link in the chain records a function to call and an
   argument to give it.

   Use make_cleanup to add an element to the cleanup chain.
   Use do_cleanups to do all cleanup actions back to a given
   point in the chain.  Use discard_cleanups to remove cleanups
   from the chain back to a given point, not doing them.  */

struct cleanup
{
  struct cleanup *next;
  void (*function) PARAMS ((PTR));
  PTR arg;
};

/* From blockframe.c */

extern int
inside_entry_func PARAMS ((CORE_ADDR));

extern int
inside_entry_file PARAMS ((CORE_ADDR addr));

extern int
inside_main_func PARAMS ((CORE_ADDR pc));

/* From ch-lang.c, for the moment. (FIXME) */

extern char *
chill_demangle PARAMS ((const char *));

/* From libiberty.a */

extern char *
cplus_demangle PARAMS ((const char *, int));

extern char *
cplus_mangle_opname PARAMS ((char *, int));

/* From libmmalloc.a (memory mapped malloc library) */

extern PTR
mmalloc_attach PARAMS ((int, PTR));

extern PTR
mmalloc_detach PARAMS ((PTR));

extern PTR
mmalloc PARAMS ((PTR, long));

extern PTR
mrealloc PARAMS ((PTR, PTR, long));

extern void
mfree PARAMS ((PTR, PTR));

extern int
mmalloc_setkey PARAMS ((PTR, int, PTR));

extern PTR
mmalloc_getkey PARAMS ((PTR, int));

/* From utils.c */

extern int
strcmp_iw PARAMS ((const char *, const char *));

extern char *
safe_strerror PARAMS ((int));

extern char *
safe_strsignal PARAMS ((int));

extern void
init_malloc PARAMS ((void *));

extern void
request_quit PARAMS ((int));

extern void
do_cleanups PARAMS ((struct cleanup *));

extern void
discard_cleanups PARAMS ((struct cleanup *));

/* The bare make_cleanup function is one of those rare beasts that
   takes almost any type of function as the first arg and anything that
   will fit in a "void *" as the second arg.

   Should be, once all calls and called-functions are cleaned up:
extern struct cleanup *
make_cleanup PARAMS ((void (*function) (void *), void *));

   Until then, lint and/or various type-checking compiler options will
   complain about make_cleanup calls.  It'd be wrong to just cast things,
   since the type actually passed when the function is called would be
   wrong.  */

extern struct cleanup *
make_cleanup ();

extern struct cleanup *
save_cleanups PARAMS ((void));

extern void
restore_cleanups PARAMS ((struct cleanup *));

extern void
free_current_contents PARAMS ((char **));

extern void
null_cleanup PARAMS ((char **));

extern int
myread PARAMS ((int, char *, int));

extern int
query ();

extern void
begin_line PARAMS ((void));

extern void
wrap_here PARAMS ((char *));

extern void
reinitialize_more_filter PARAMS ((void));

typedef FILE GDB_FILE;
#define gdb_stdout stdout
#define gdb_stderr stderr

extern int
print_insn PARAMS ((CORE_ADDR, GDB_FILE *));

extern void
gdb_flush PARAMS ((GDB_FILE *));

extern GDB_FILE *
gdb_fopen PARAMS ((char * name, char * mode));

extern void
fputs_filtered PARAMS ((const char *, GDB_FILE *));

extern void
fputs_unfiltered PARAMS ((const char *, GDB_FILE *));

extern void
fputc_unfiltered PARAMS ((int, GDB_FILE *));

extern void
putc_unfiltered PARAMS ((int));

#define putchar_unfiltered(C)  putc_unfiltered(C)

extern void
puts_filtered PARAMS ((char *));

extern void
puts_unfiltered PARAMS ((char *));

extern void
vprintf_filtered ();

extern void
vfprintf_filtered ();

extern void
fprintf_filtered ();

extern void
fprintfi_filtered ();

extern void
printf_filtered ();

extern void
printfi_filtered ();

extern void
vprintf_unfiltered ();

extern void
vfprintf_unfiltered ();

extern void
fprintf_unfiltered ();

extern void
printf_unfiltered ();

extern void
print_spaces PARAMS ((int, GDB_FILE *));

extern void
print_spaces_filtered PARAMS ((int, GDB_FILE *));

extern char *
n_spaces PARAMS ((int));

extern void
gdb_printchar PARAMS ((int, GDB_FILE *, int));

/* Print a host address.  */
extern void gdb_print_address PARAMS ((void *, GDB_FILE *));

extern void
fprintf_symbol_filtered PARAMS ((GDB_FILE *, char *, enum language, int));

extern void
perror_with_name PARAMS ((char *));

extern void
print_sys_errmsg PARAMS ((char *, int));

/* From regex.c or libc.  BSD 4.4 declares this with the argument type as
   "const char *" in unistd.h, so we can't declare the argument
   as "char *".  */

extern char *
re_comp PARAMS ((const char *));

/* From symfile.c */

extern void
symbol_file_command PARAMS ((char *, int));

/* From main.c */

extern char *
skip_quoted PARAMS ((char *));

extern char *
gdb_readline PARAMS ((char *));

extern char *
command_line_input PARAMS ((char *, int));

extern void
print_prompt PARAMS ((void));

extern int
batch_mode PARAMS ((void));

extern int
input_from_terminal_p PARAMS ((void));

/* From printcmd.c */

extern void
set_next_address PARAMS ((CORE_ADDR));

extern void
print_address_symbolic PARAMS ((CORE_ADDR, GDB_FILE *, int, char *));

extern void
print_address_numeric PARAMS ((CORE_ADDR, GDB_FILE *));

extern void
print_address PARAMS ((CORE_ADDR, GDB_FILE *));

/* From source.c */

extern int
openp PARAMS ((char *, int, char *, int, int, char **));

extern void
mod_path PARAMS ((char *, char **));

extern void
directory_command PARAMS ((char *, int));

extern void
init_source_path PARAMS ((void));

/* From findvar.c */

extern int
read_relative_register_raw_bytes PARAMS ((int, char *));

/* From readline (but not in any readline .h files).  */

extern char *
tilde_expand PARAMS ((char *));

/* Structure for saved commands lines
   (for breakpoints, defined commands, etc).  */

struct command_line
{
  struct command_line *next;
  char *line;
};

extern struct command_line *
read_command_lines PARAMS ((void));

extern void
free_command_lines PARAMS ((struct command_line **));

/* String containing the current directory (what getwd would return).  */

extern char *current_directory;

/* Default radixes for input and output.  Only some values supported.  */
extern unsigned input_radix;
extern unsigned output_radix;

/* Possibilities for prettyprint parameters to routines which print
   things.  Like enum language, this should be in value.h, but needs
   to be here for the same reason.  FIXME:  If we can eliminate this
   as an arg to LA_VAL_PRINT, then we can probably move it back to
   value.h. */

enum val_prettyprint
{
  Val_no_prettyprint = 0,
  Val_prettyprint,
  /* Use the default setting which the user has specified.  */
  Val_pretty_default
};

\f
/* Host machine definition.  This will be a symlink to one of the
   xm-*.h files, built by the `configure' script.  */

#include "xm.h"

/* Native machine support.  This will be a symlink to one of the
   nm-*.h files, built by the `configure' script.  */

#include "nm.h"

/* If the xm.h file did not define the mode string used to open the
   files, assume that binary files are opened the same way as text
   files */
#ifndef FOPEN_RB
#include "fopen-same.h"
#endif

/*
 * Allow things in gdb to be declared "const".  If compiling ANSI, it
 * just works.  If compiling with gcc but non-ansi, redefine to __const__.
 * If non-ansi, non-gcc, then eliminate "const" entirely, making those
 * objects be read-write rather than read-only.
 */

#ifndef const
#ifndef __STDC__
# ifdef __GNUC__
#  define const __const__
# else
#  define const /*nothing*/
# endif /* GNUC */
#endif /* STDC */
#endif /* const */

#ifndef volatile
#ifndef __STDC__
# ifdef __GNUC__
#  define volatile __volatile__
# else
#  define volatile /*nothing*/
# endif /* GNUC */
#endif /* STDC */
#endif /* volatile */

#if 1
#define NORETURN /*nothing*/
#else /* not 1 */
/* FIXME: This is bogus.  Having "volatile void" mean a function doesn't
   return is a gcc extension and should be based on #ifdef __GNUC__.
   Also, as of Sep 93 I'm told gcc is changing the syntax for ansi
   reasons (so declaring exit here as "volatile void" and as "void" in
   a system header loses).  Using the new "__attributes__ ((noreturn));"
   syntax would lose for old versions of gcc; using
     typedef void exit_fn_type PARAMS ((int));
     volatile exit_fn_type exit;
   would win.  */
/* Some compilers (many AT&T SVR4 compilers for instance), do not accept
   declarations of functions that never return (exit for instance) as
   "volatile void".  For such compilers "NORETURN" can be defined away
   to keep them happy */

#ifndef NORETURN
# ifdef __lucid
#   define NORETURN /*nothing*/
# else
#   define NORETURN volatile
# endif
#endif
#endif /* not 1 */

/* Defaults for system-wide constants (if not defined by xm.h, we fake it).  */

#if !defined (UINT_MAX)
#define	UINT_MAX ((unsigned int)(~0))		/* 0xFFFFFFFF for 32-bits */
#endif

#if !defined (INT_MAX)
#define	INT_MAX ((int)(UINT_MAX >> 1))		/* 0x7FFFFFFF for 32-bits */
#endif

#if !defined (INT_MIN)
#define INT_MIN (-INT_MAX - 1)			/* 0x80000000 for 32-bits */
#endif

#if !defined (ULONG_MAX)
#define	ULONG_MAX ((unsigned long)(~0L))	/* 0xFFFFFFFF for 32-bits */
#endif

#if !defined (LONG_MAX)
#define	LONG_MAX ((long)(ULONG_MAX >> 1))	/* 0x7FFFFFFF for 32-bits */
#endif

/* Default to support for "long long" if the host compiler being used is gcc.
   Config files must define CC_HAS_LONG_LONG to use other host compilers
   that are capable of supporting "long long", and to cause gdb to use that
   support.  Not defining CC_HAS_LONG_LONG will suppress use of "long long"
   regardless of what compiler is used.

   FIXME: For now, automatic selection of "long long" as the default when
   gcc is used is disabled, pending further testing.  Concerns include the
   impact on gdb performance and the universality of bugfree long long
   support on platforms that do have gcc.  Compiling with FORCE_LONG_LONG
   will select "long long" use for testing purposes.  -fnf */

#ifndef CC_HAS_LONG_LONG
#  if defined (__GNUC__) && defined (FORCE_LONG_LONG) /* See FIXME above */
#    define CC_HAS_LONG_LONG 1
#  endif
#endif
	
/* LONGEST should not be a typedef, because "unsigned LONGEST" needs to work.
   CC_HAS_LONG_LONG is defined if the host compiler supports "long long"
   variables and we wish to make use of that support.  */

#ifndef LONGEST
#  ifdef CC_HAS_LONG_LONG
#    define LONGEST long long
#  else
#    define LONGEST long
#  endif
#endif

/* Convert a LONGEST to an int.  This is used in contexts (e.g. number of
   arguments to a function, number in a value history, register number, etc.)
   where the value must not be larger than can fit in an int.  */

#ifndef longest_to_int
#  ifdef CC_HAS_LONG_LONG
#    define longest_to_int(x) (((x) > INT_MAX || (x) < INT_MIN) \
			       ? (error ("Value out of range."),0) : (int) (x))
#  else
     /* Assume sizeof (int) == sizeof (long).  */
#    define longest_to_int(x) ((int) (x))
#  endif
#endif

/* Assorted functions we can declare, now that const and volatile are 
   defined.  */

extern char *
savestring PARAMS ((const char *, int));

extern char *
msavestring PARAMS ((void *, const char *, int));

extern char *
strsave PARAMS ((const char *));

extern char *
mstrsave PARAMS ((void *, const char *));

extern char *
concat PARAMS ((char *, ...));

extern PTR
xmalloc PARAMS ((long));

extern PTR
xrealloc PARAMS ((PTR, long));

extern PTR
xmmalloc PARAMS ((PTR, long));

extern PTR
xmrealloc PARAMS ((PTR, PTR, long));

extern PTR
mmalloc PARAMS ((PTR, long));

extern PTR
mrealloc PARAMS ((PTR, PTR, long));

extern void
mfree PARAMS ((PTR, PTR));

extern int
mmcheck PARAMS ((PTR, void (*) (void)));

extern int
mmtrace PARAMS ((void));

extern int
parse_escape PARAMS ((char **));

extern const char * const reg_names[];

/* Message to be printed before the error message, when an error occurs.  */

extern char *error_pre_print;

/* Message to be printed before the warning message, when a warning occurs.  */

extern char *warning_pre_print;

extern NORETURN void			/* Does not return to the caller.  */
error ();

extern NORETURN void			/* Does not return to the caller.  */
fatal ();

extern NORETURN void			/* Not specified as volatile in ... */
exit PARAMS ((int));			/* 4.10.4.3 */

extern NORETURN void			/* Does not return to the caller.  */
nomem PARAMS ((long));

/* Reasons for calling return_to_top_level.  */
enum return_reason {
  /* User interrupt.  */
  RETURN_QUIT,

  /* Any other error.  */
  RETURN_ERROR
};

#define RETURN_MASK_QUIT (1 << (int)RETURN_QUIT)
#define RETURN_MASK_ERROR (1 << (int)RETURN_ERROR)
#define RETURN_MASK_ALL (RETURN_MASK_QUIT | RETURN_MASK_ERROR)
typedef int return_mask;

extern NORETURN void			/* Does not return to the caller.  */
return_to_top_level PARAMS ((enum return_reason));

extern int catch_errors PARAMS ((int (*) (char *), void *, char *,
				 return_mask));

extern void
warning_setup PARAMS ((void));

extern void
warning ();

/* Global functions from other, non-gdb GNU thingies (libiberty for
   instance) */

extern char *
basename PARAMS ((char *));

extern char *
getenv PARAMS ((const char *));

extern char **
buildargv PARAMS ((char *));

extern void
freeargv PARAMS ((char **));

extern char *
strerrno PARAMS ((int));

extern char *
strsigno PARAMS ((int));

extern int
errno_max PARAMS ((void));

extern int
signo_max PARAMS ((void));

extern int
strtoerrno PARAMS ((char *));

extern int
strtosigno PARAMS ((char *));

extern char *
strsignal PARAMS ((int));

/* From other system libraries */

#ifndef PSIGNAL_IN_SIGNAL_H
extern void
psignal PARAMS ((unsigned, const char *));
#endif

/* For now, we can't include <stdlib.h> because it conflicts with
   "../include/getopt.h".  (FIXME)

   However, if a function is defined in the ANSI C standard and a prototype
   for that function is defined and visible in any header file in an ANSI
   conforming environment, then that prototype must match the definition in
   the ANSI standard.  So we can just duplicate them here without conflict,
   since they must be the same in all conforming ANSI environments.  If
   these cause problems, then the environment is not ANSI conformant. */
   
#ifdef __STDC__
#include <stddef.h>
#endif

extern int
fclose PARAMS ((GDB_FILE *stream));				/* 4.9.5.1 */

extern void
perror PARAMS ((const char *));				/* 4.9.10.4 */

extern double
atof PARAMS ((const char *nptr));			/* 4.10.1.1 */

extern int
atoi PARAMS ((const char *));				/* 4.10.1.2 */

#ifndef MALLOC_INCOMPATIBLE

extern PTR
malloc PARAMS ((size_t size));                          /* 4.10.3.3 */

extern PTR
realloc PARAMS ((void *ptr, size_t size));              /* 4.10.3.4 */

extern void
free PARAMS ((void *));					/* 4.10.3.2 */

#endif	/* MALLOC_INCOMPATIBLE */

extern void
qsort PARAMS ((void *base, size_t nmemb,		/* 4.10.5.2 */
	       size_t size,
	       int (*comp)(const void *, const void *)));

#ifndef	MEM_FNS_DECLARED	/* Some non-ANSI use void *, not char *.  */
extern PTR
memcpy PARAMS ((void *, const void *, size_t));		/* 4.11.2.1 */

extern int
memcmp PARAMS ((const void *, const void *, size_t));	/* 4.11.4.1 */
#endif

extern char *
strchr PARAMS ((const char *, int));			/* 4.11.5.2 */

extern char *
strrchr PARAMS ((const char *, int));			/* 4.11.5.5 */

extern char *
strstr PARAMS ((const char *, const char *));		/* 4.11.5.7 */

extern char *
strtok PARAMS ((char *, const char *));			/* 4.11.5.8 */

#ifndef	MEM_FNS_DECLARED	/* Some non-ANSI use void *, not char *.  */
extern PTR
memset PARAMS ((void *, int, size_t));			/* 4.11.6.1 */
#endif

extern char *
strerror PARAMS ((int));				/* 4.11.6.2 */

/* Various possibilities for alloca.  */
#ifndef alloca
# ifdef __GNUC__
#  define alloca __builtin_alloca
# else
#  ifdef sparc
#   include <alloca.h>		/* NOTE:  Doesn't declare alloca() */
#  endif
#  ifdef __STDC__
   extern void *alloca (size_t);
#  else /* __STDC__ */
   extern char *alloca ();
#  endif
# endif
#endif

/* TARGET_BYTE_ORDER and HOST_BYTE_ORDER must be defined to one of these.  */

#if !defined (BIG_ENDIAN)
#define BIG_ENDIAN 4321
#endif

#if !defined (LITTLE_ENDIAN)
#define LITTLE_ENDIAN 1234
#endif

/* Target-system-dependent parameters for GDB. */

/* Target machine definition.  This will be a symlink to one of the
   tm-*.h files, built by the `configure' script.  */

#include "tm.h"

/* Number of bits in a char or unsigned char for the target machine.
   Just like CHAR_BIT in <limits.h> but describes the target machine.  */
#if !defined (TARGET_CHAR_BIT)
#define TARGET_CHAR_BIT 8
#endif

/* Number of bits in a short or unsigned short for the target machine. */
#if !defined (TARGET_SHORT_BIT)
#define TARGET_SHORT_BIT (2 * TARGET_CHAR_BIT)
#endif

/* Number of bits in an int or unsigned int for the target machine. */
#if !defined (TARGET_INT_BIT)
#define TARGET_INT_BIT (4 * TARGET_CHAR_BIT)
#endif

/* Number of bits in a long or unsigned long for the target machine. */
#if !defined (TARGET_LONG_BIT)
#define TARGET_LONG_BIT (4 * TARGET_CHAR_BIT)
#endif

/* Number of bits in a long long or unsigned long long for the target machine. */
#if !defined (TARGET_LONG_LONG_BIT)
#define TARGET_LONG_LONG_BIT (2 * TARGET_LONG_BIT)
#endif

/* Number of bits in a float for the target machine. */
#if !defined (TARGET_FLOAT_BIT)
#define TARGET_FLOAT_BIT (4 * TARGET_CHAR_BIT)
#endif

/* Number of bits in a double for the target machine. */
#if !defined (TARGET_DOUBLE_BIT)
#define TARGET_DOUBLE_BIT (8 * TARGET_CHAR_BIT)
#endif

/* Number of bits in a long double for the target machine.  */
#if !defined (TARGET_LONG_DOUBLE_BIT)
#define TARGET_LONG_DOUBLE_BIT (2 * TARGET_DOUBLE_BIT)
#endif

/* Number of bits in a "complex" for the target machine. */
#if !defined (TARGET_COMPLEX_BIT)
#define TARGET_COMPLEX_BIT (2 * TARGET_FLOAT_BIT)
#endif

/* Number of bits in a "double complex" for the target machine. */
#if !defined (TARGET_DOUBLE_COMPLEX_BIT)
#define TARGET_DOUBLE_COMPLEX_BIT (2 * TARGET_DOUBLE_BIT)
#endif

/* Number of bits in a pointer for the target machine */
#if !defined (TARGET_PTR_BIT)
#define TARGET_PTR_BIT TARGET_INT_BIT
#endif

/* If we picked up a copy of CHAR_BIT from a configuration file
   (which may get it by including <limits.h>) then use it to set
   the number of bits in a host char.  If not, use the same size
   as the target. */

#if defined (CHAR_BIT)
#define HOST_CHAR_BIT CHAR_BIT
#else
#define HOST_CHAR_BIT TARGET_CHAR_BIT
#endif

/* The bit byte-order has to do just with numbering of bits in
   debugging symbols and such.  Conceptually, it's quite separate
   from byte/word byte order.  */

#if !defined (BITS_BIG_ENDIAN)
#if TARGET_BYTE_ORDER == BIG_ENDIAN
#define BITS_BIG_ENDIAN 1
#endif /* Big endian.  */

#if TARGET_BYTE_ORDER == LITTLE_ENDIAN
#define BITS_BIG_ENDIAN 0
#endif /* Little endian.  */
#endif /* BITS_BIG_ENDIAN not defined.  */

/* In findvar.c.  */
LONGEST extract_signed_integer PARAMS ((void *, int));
unsigned LONGEST extract_unsigned_integer PARAMS ((void *, int));
CORE_ADDR extract_address PARAMS ((void *, int));

void store_signed_integer PARAMS ((void *, int, LONGEST));
void store_unsigned_integer PARAMS ((void *, int, unsigned LONGEST));
void store_address PARAMS ((void *, int, CORE_ADDR));

double extract_floating PARAMS ((void *, int));
void store_floating PARAMS ((void *, int, double));
\f
/* On some machines there are bits in addresses which are not really
   part of the address, but are used by the kernel, the hardware, etc.
   for special purposes.  ADDR_BITS_REMOVE takes out any such bits
   so we get a "real" address such as one would find in a symbol
   table.  This is used only for addresses of instructions, and even then
   I'm not sure it's used in all contexts.  It exists to deal with there
   being a few stray bits in the PC which would mislead us, not as some sort
   of generic thing to handle alignment or segmentation (it's possible it
   should be in TARGET_READ_PC instead).  */
#if !defined (ADDR_BITS_REMOVE)
#define ADDR_BITS_REMOVE(addr) (addr)
#endif /* No ADDR_BITS_REMOVE.  */

/* From valops.c */

extern CORE_ADDR
push_bytes PARAMS ((CORE_ADDR, char *, int));

extern CORE_ADDR
push_word PARAMS ((CORE_ADDR, unsigned LONGEST));

/* Some parts of gdb might be considered optional, in the sense that they
   are not essential for being able to build a working, usable debugger
   for a specific environment.  For example, the maintenance commands
   are there for the benefit of gdb maintainers.  As another example,
   some environments really don't need gdb's that are able to read N
   different object file formats.  In order to make it possible (but
   not necessarily recommended) to build "stripped down" versions of
   gdb, the following defines control selective compilation of those
   parts of gdb which can be safely left out when necessary.  Note that
   the default is to include everything. */

#ifndef MAINTENANCE_CMDS
#define MAINTENANCE_CMDS 1
#endif

#endif /* !defined (DEFS_H) */