code.delx.au - gnu-emacs/blob - src/m/intel386.h

   1 /* Machine description file for intel 386.
   2    Copyright (C) 1987 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs 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, or (at your option)
   9 any later version.
  10
  11 GNU Emacs 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 GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20
  21 /* The following line tells the configuration script what sort of
  22    operating system this machine is likely to run.
  23    USUAL-OPSYS="note"
  24
  25 NOTE-START
  26 Intel 386 (-machine=intel386 or -machine=is386.h)
  27
  28   The possibilities for -opsystem are: bsd4-2, usg5-2-2, usg5-3,
  29   isc2-2, 386-ix, esix, linux, sco3.2v4, and xenix.
  30
  31   18.58 should support a wide variety of operating systems.
  32   Use isc2-2 for Interactive 386/ix version 2.2.
  33   Use 386ix for prior versions.
  34   Use esix for Esix.
  35   Use linux for Linux.
  36   It isn't clear what to do on an SCO system.
  37
  38   -machine=is386 is used for an Integrated Solutions 386 machine.
  39   It may also be correct for Microport systems.
  40
  41 Cubix QBx/386 (-machine=intel386 -opsystem=usg5-3)
  42
  43   Changes merged in 19.1.  Systems before 2/A/0 may fail to compile etags.c
  44   due to a compiler bug.
  45
  46 Prime EXL (-machine=intel386 -opsystem=usg5-3)
  47
  48   Minor changes merged in 19.1.
  49 NOTE-END */
  50
  51 /* The following three symbols give information on
  52  the size of various data types.  */
  53
  54
  55 /* Linux defines these in <values.h>, but they can't be used in #if's.
  56    #include it now so we know we've overridden it once and for all.  */
  57 #ifdef linux
  58 #include <values.h>
  59 #undef SHORTBITS
  60 #undef INTBITS
  61 #undef LONGBITS
  62 #endif
  63
  64 #define SHORTBITS 16            /* Number of bits in a short */
  65
  66 #define INTBITS 32              /* Number of bits in an int */
  67
  68 #define LONGBITS 32             /* Number of bits in a long */
  69
  70 /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
  71    is the most significant byte.  */
  72
  73 #undef WORDS_BIG_ENDIAN
  74
  75 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  76  * group of arguments and treat it as an array of the arguments.  */
  77
  78 /* #define NO_ARG_ARRAY */
  79
  80 /* Define WORD_MACHINE if addresses and such have
  81  * to be corrected before they can be used as byte counts.  */
  82
  83 /* #define WORD_MACHINE */
  84
  85 /* Now define a symbol for the cpu type, if your compiler
  86    does not define it automatically:
  87    Ones defined so far include vax, m68000, ns16000, pyramid,
  88    orion, tahoe, APOLLO and many others */
  89
  90 #define INTEL386
  91
  92 /* Use type int rather than a union, to represent Lisp_Object */
  93
  94 #define NO_UNION_TYPE
  95
  96 /* crt0.c, if it is used, should use the i386-bsd style of entry.
  97    with no extra dummy args.  On USG and XENIX,
  98    NO_REMAP says this isn't used. */
  99
 100 #define CRT0_DUMMIES bogus_fp,
 101
 102 /* crt0.c should define a symbol `start' and do .globl with a dot.  */
 103
 104 #define DOT_GLOBAL_START
 105
 106 #ifdef XENIX
 107 /* Data type of load average, as read out of kmem.  */
 108 #define LOAD_AVE_TYPE short
 109
 110 /* Convert that into an integer that is 100 for a load average of 1.0  */
 111 #define LOAD_AVE_CVT(x) (((double) (x)) * 100.0 / FSCALE)
 112
 113 #define FSCALE 256.0         /* determined by experimentation...  */
 114 #endif
 115
 116
 117 #ifdef SOLARIS2
 118 /* Data type of load average, as read out of kmem.  */
 119 #define LOAD_AVE_TYPE long
 120
 121 /* Convert that into an integer that is 100 for a load average of 1.0  */
 122 /* This is totally uncalibrated. */
 123 #define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
 124
 125 /* J.W.Hawtin@lut.ac.uk say Solaris 2.4 as well as Solaris 2.1 on X86
 126    requires -lkvm as well */
 127 #define LIBS_MACHINE -lkvm
 128
 129 #ifndef SOLARIS2_4
 130 /* J.W.hawtin@lut.ac.uk says Solaris 2.1 on the X86 has FSCALE defined in a
 131    system header. */
 132
 133 #define HAVE_VFORK
 134
 135 #else /* SOLARIS2_4 */
 136 #ifndef __GNUC__
 137 #if 0 /* wisner@gryphon.com says this screws up cpp */
 138 #define C_SWITCH_MACHINE -Xa
 139 #endif
 140 #ifndef NOT_C_CODE
 141 #ifdef HAVE_ALLOCA_H
 142 #include <alloca.h>
 143 #endif /* HAVE_ALLOCA_H */
 144 #endif /* not NOT_C_CODE */
 145 #endif /* not __GNUC__ */
 146 #endif /* SOLARIS2_4 */
 147
 148 /* configure thinks solaris X86 has gethostname, but it does not work,
 149    so undefine it.  */
 150 #undef HAVE_GETHOSTNAME
 151
 152 #else /* not SOLARIS2 */
 153 #ifdef USG5_4 /* Older USG systems do not support the load average.  */
 154 /* Data type of load average, as read out of kmem.  */
 155
 156 #define LOAD_AVE_TYPE long
 157
 158 /* Convert that into an integer that is 100 for a load average of 1.0  */
 159 /* This is totally uncalibrated. */
 160
 161 #define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
 162 #define FSCALE 256.0
 163 #endif
 164 #endif /* not SOLARIS2 */
 165
 166 /* Define CANNOT_DUMP on machines where unexec does not work.
 167    Then the function dump-emacs will not be defined
 168    and temacs will do (load "loadup") automatically unless told otherwise.  */
 169
 170 /* #define CANNOT_DUMP */
 171
 172 /* Define VIRT_ADDR_VARIES if the virtual addresses of
 173    pure and impure space as loaded can vary, and even their
 174    relative order cannot be relied on.
 175
 176    Otherwise Emacs assumes that text space precedes data space,
 177    numerically.  */
 178
 179 /* #define VIRT_ADDR_VARIES */
 180
 181 #ifdef XENIX
 182 /* Define NO_REMAP if memory segmentation makes it not work well
 183    to change the boundary between the text section and data section
 184    when Emacs is dumped.  If you define this, the preloaded Lisp
 185    code will not be sharable; but that's better than failing completely.  */
 186
 187 #define NO_REMAP
 188
 189 #define STACK_DIRECTION -1
 190
 191 /* Since cannot purify, use standard Xenix 386 startup code. */
 192
 193 #define START_FILES     /lib/386/Sseg.o pre-crt0.o /lib/386/Scrt0.o
 194
 195 /* These really use terminfo.  */
 196
 197 #define LIBS_TERMCAP /lib/386/Slibcurses.a  \
 198    /lib/386/Slibtinfo.a /lib/386/Slibx.a
 199
 200 /* Standard libraries for this machine.  Since `-l' doesn't work in `ld'.  */
 201 /* '__fltused' is unresolved w/o Slibcfp.a */
 202 #define LIB_STANDARD /lib/386/Slibcfp.a /lib/386/Slibc.a
 203 #else /* not XENIX */
 204
 205 /* this brings in alloca() if we're using cc */
 206 #ifdef USG
 207 #ifndef LIB_STANDARD
 208 #ifdef USG5_4
 209 #define LIB_STANDARD -lc
 210 #else /* not USG5_4 */
 211 #define LIB_STANDARD -lPW -lc
 212 #endif /* not USG5_4 */
 213 #endif /* LIB_STANDARD */
 214
 215 #define HAVE_ALLOCA
 216 #define NO_REMAP
 217 #define TEXT_START 0
 218 #endif /* USG */
 219 #endif /* not XENIX */
 220
 221 #ifdef BSD
 222 #define HAVE_ALLOCA
 223 #endif /* BSD */
 224
 225 /* If compiling with GCC, let GCC implement alloca.  */
 226 #if defined(__GNUC__) && !defined(alloca)
 227 #define alloca(n) __builtin_alloca(n)
 228 #define HAVE_ALLOCA
 229 #endif
 230
 231 #ifdef USG5_4
 232 #define DATA_SEG_BITS 0x08000000
 233 #endif
 234
 235 #ifdef MSDOS
 236 #define NO_REMAP
 237 #endif
 238
 239 #ifdef WINDOWSNT
 240 #define VIRT_ADDR_VARIES
 241 #define DATA_END        get_data_end ()
 242 #define DATA_START      get_data_start ()
 243 #define HAVE_ALLOCA
 244 #define NO_ARG_ARRAY
 245 #endif
 246
 247 #ifdef linux
 248 /* libc-linux/sysdeps/linux/i386/ulimit.c says that due to shared library, */
 249 /* we cannot get the maximum address for brk */
 250 #define ULIMIT_BREAK_VALUE (32*1024*1024)
 251
 252 #define SEGMENT_MASK ((SEGMENT_SIZE)-1)
 253 #endif