alpha.h 6.85 KB
Newer Older
Richard M. Stallman's avatar
Richard M. Stallman committed
1
/* machine description file For the alpha chip.
2
   Copyright (C) 1994, 1997, 1999 Free Software Foundation, Inc.
Richard M. Stallman's avatar
Richard M. Stallman committed
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

This file is part of GNU Emacs.

GNU Emacs 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 1, or (at your option)
any later version.

GNU Emacs 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 GNU Emacs; see the file COPYING.  If not, write to
18 19
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
20 21 22 23 24 25 26 27 28 29 30 31


/* The following line tells the configuration script what sort of 
   operating system this machine is likely to run.
   USUAL-OPSYS="note"

NOTE-START
Use -opsystem=osf1
NOTE-END

*/

32
#define BITS_PER_LONG 64
33
#define BITS_PER_EMACS_INT 64
Gerd Moellmann's avatar
Gerd Moellmann committed
34
#ifndef _LP64
Dave Love's avatar
Dave Love committed
35 36
#define _LP64			/* This doesn't appear to be necessary
				   on OSF 4/5  -- fx.  */
Gerd Moellmann's avatar
Gerd Moellmann committed
37
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
38

39 40 41 42 43
/* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
   is the most significant byte.  */

#undef WORDS_BIG_ENDIAN

Richard M. Stallman's avatar
Richard M. Stallman committed
44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
/* Define NO_ARG_ARRAY if you cannot take the address of the first of a
 * group of arguments and treat it as an array of the arguments.  */

#define NO_ARG_ARRAY

/* Now define a symbol for the cpu type, if your compiler
   does not define it automatically:
   Ones defined so far include vax, m68000, ns16000, pyramid,
   orion, tahoe, APOLLO and many others */

/* __alpha defined automatically */


/* Use type EMACS_INT rather than a union, to represent Lisp_Object */
/* This is desirable for most machines.  */

#define NO_UNION_TYPE

/* Define the type to use.  */
#define EMACS_INT long
#define EMACS_UINT unsigned long
65
#define SPECIAL_EMACS_INT
Richard M. Stallman's avatar
Richard M. Stallman committed
66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92

/* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
   the 24-bit bit field into an int.  In other words, if bit fields
   are always unsigned.

   If you use NO_UNION_TYPE, this flag does not matter.  */

#define EXPLICIT_SIGN_EXTEND

/* Data type of load average, as read out of kmem.  */

#define LOAD_AVE_TYPE long

/* Convert that into an integer that is 100 for a load average of 1.0  */

#define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)

/* Define C_ALLOCA if this machine does not support a true alloca
   and the one written in C should be used instead.
   Define HAVE_ALLOCA to say that the system provides a properly
   working alloca function and it should be used.
   Define neither one if an assembler-language alloca
   in the file alloca.s should be used.  */

#define HAVE_ALLOCA

/* GNU malloc and the relocating allocator do not work together
93 94 95 96 97 98 99 100 101
   with X.   [Who wrote that?]  */

/* May 1995: reportedly [Rainer Schoepf <schoepf@uni-mainz.de>] both the
   system and the gnu malloc system work with "alpha-dec-osf3.0" and
   "alpha-dec-osf3.2".  */

/* May 1995: it seems to me [Morten Welinder <terra@diku.dk>] that both
   mallocs work with "alpha-dec-osf2.0", but I daren't break anything
   right now.  Feel free to play if you want.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
102

103
/* #define SYSTEM_MALLOC */
Richard M. Stallman's avatar
Richard M. Stallman committed
104

105 106 107 108 109 110 111 112 113 114 115 116 117
#ifdef __ELF__
/* With ELF, make sure that all common symbols get allocated to in the
   data section.  Otherwise, the dump of temacs may miss variables in
   the shared library that have been initialized.  For example, with
   GNU libc, __malloc_initialized would normally be resolved to the
   shared library's .bss section, which is fatal.  */
# ifdef __GNUC__
#  define C_SWITCH_MACHINE	-fno-common
# else
#  error What gives?  Fix me if DEC Unix supports ELF now.
# endif
#endif

Gerd Moellmann's avatar
Gerd Moellmann committed
118
#if defined(__OpenBSD__)
119 120 121
#define ORDINARY_LINK
#endif

122 123
#ifdef __ELF__
#undef UNEXEC
Richard M. Stallman's avatar
Richard M. Stallman committed
124
#define UNEXEC unexelf.o
125 126
#endif

127 128
#ifndef __ELF__

Richard M. Stallman's avatar
Richard M. Stallman committed
129 130 131 132 133 134 135 136 137 138
/* Describe layout of the address space in an executing process.  */

#define TEXT_START    0x120000000
#define DATA_START    0x140000000

/* This is necessary for mem-limits.h, so that start_of_data gives
   the correct value */

#define DATA_SEG_BITS 0x140000000

139 140 141 142 143 144
/* The program to be used for unexec. */

#define UNEXEC unexalpha.o

#endif /* notdef __ELF__ */

Richard M. Stallman's avatar
Richard M. Stallman committed
145
#ifdef OSF1
Richard M. Stallman's avatar
Richard M. Stallman committed
146 147
#define ORDINARY_LINK

148 149 150 151 152 153
/* Some systems seem to have this, others don't.  */
#ifdef HAVE_LIBDNET
#define LIBS_MACHINE -ldnet
#else
#define LIBS_MACHINE -ldnet_stub
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
154
#endif /* OSF1 */
155

156 157
#if 0 /* Rainer Schoepf <schoepf@uni-mainz.de> says this loses with X11R6
	 since it has only shared libraries.  */
158 159
#ifndef __GNUC__
/* This apparently is for the system ld as opposed to Gnu ld.  */
160 161 162
#ifdef OSF1
#define LD_SWITCH_MACHINE      -non_shared
#endif
163
#endif
164
#endif /* 0 */
165

Richard M. Stallman's avatar
Richard M. Stallman committed
166
#ifdef OSF1
Richard M. Stallman's avatar
Richard M. Stallman committed
167 168
#define LIBS_DEBUG
#define START_FILES pre-crt0.o
169
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
170

171
#if defined (LINUX) && __GNU_LIBRARY__ - 0 < 6
172 173 174
/* This controls a conditional in main.  */
#define LINUX_SBRK_BUG
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
175 176 177 178


#define PNTR_COMPARISON_TYPE unsigned long

179
/* On the 64 bit architecture, we can use 60 bits for addresses */
Richard M. Stallman's avatar
Richard M. Stallman committed
180

181
#define VALBITS         60
Richard M. Stallman's avatar
Richard M. Stallman committed
182 183 184 185 186 187 188 189 190 191


/* This definition of MARKBIT is necessary because of the comparison of
   ARRAY_MARK_FLAG and MARKBIT in an #if in lisp.h, which cpp doesn't like. */

#define MARKBIT         0x8000000000000000L


/* Define XINT and XUINT so that they can take arguments of type int */

192
#define XINT(a)  (((long) (a) << (BITS_PER_LONG - VALBITS)) >> (BITS_PER_LONG - VALBITS))
193
#define XUINT(a) ((long) (a) & VALMASK)
Richard M. Stallman's avatar
Richard M. Stallman committed
194 195 196 197

/* Define XPNTR to avoid or'ing with DATA_SEG_BITS */

#define XPNTR(a) XUINT (a)
198 199 200

#ifndef NOT_C_CODE
/* We need these because pointers are larger than the default ints.  */
201
#if !defined(__NetBSD__) && !defined(__OpenBSD__)
202
#include <alloca.h>
203
#endif
204

205
#endif /* not NOT_C_CODE */
206

Richard M. Stallman's avatar
Richard M. Stallman committed
207
#ifdef OSF1
208 209 210 211 212 213 214
#define PTY_ITERATION		for (i = 0; i < 1; i++) /* ick */
#define PTY_NAME_SPRINTF	/* none */
#define PTY_TTY_NAME_SPRINTF	/* none */
#define PTY_OPEN					\
  do							\
    {							\
      int dummy;					\
215
      SIGMASKTYPE mask;					\
216
      mask = sigblock (sigmask (SIGCHLD));		\
217 218
      if (-1 == openpty (&fd, &dummy, pty_name, 0, 0))	\
	fd = -1;					\
219
      sigsetmask (mask);				\
220
      emacs_close (dummy);				\
221 222
    }							\
  while (0)
Richard M. Stallman's avatar
Richard M. Stallman committed
223
#endif
224

225 226
/* On the Alpha it's best to avoid including TERMIO since struct
   termio and struct termios are mutually incompatible.  */
227 228
#define NO_TERMIO

229
#if defined (LINUX) || defined (__NetBSD__) || defined (__OpenBSD__)
230 231 232 233 234
# define TEXT_END ({ extern int _etext; &_etext; })
# ifndef __ELF__
#  define COFF
#  define DATA_END ({ extern int _EDATA; &_EDATA; })
# endif /* notdef __ELF__ */
235
#endif
236 237 238 239

#if (defined (__NetBSD__) || defined (__OpenBSD__)) && defined (__ELF__)
#define HAVE_TEXT_START
#endif
240 241 242 243 244 245

/* Many Alpha implementations (e.g. gas 2.8) can't handle DBL_MIN:
   they generate code that uses a signaling NaN instead of DBL_MIN.
   Define DBL_MIN_REPLACEMENT to be the next value larger than DBL_MIN:
   this avoids the assembler bug.  */
#define DBL_MIN_REPLACEMENT 2.2250738585072019e-308