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 #undef SHORTBITS
  57 #undef INTBITS
  58 #undef LONGBITS
  59
  60 #define SHORTBITS 16            /* Number of bits in a short */
  61
  62 #define INTBITS 32              /* Number of bits in an int */
  63
  64 #define LONGBITS 32             /* Number of bits in a long */
  65
  66 /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
  67    is the most significant byte.  */
  68
  69 #undef WORDS_BIG_ENDIAN
  70
  71 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  72  * group of arguments and treat it as an array of the arguments.  */
  73
  74 /* #define NO_ARG_ARRAY */
  75
  76 /* Define WORD_MACHINE if addresses and such have
  77  * to be corrected before they can be used as byte counts.  */
  78
  79 /* #define WORD_MACHINE */
  80
  81 /* Now define a symbol for the cpu type, if your compiler
  82    does not define it automatically:
  83    Ones defined so far include vax, m68000, ns16000, pyramid,
  84    orion, tahoe, APOLLO and many others */
  85
  86 #define INTEL386
  87
  88 /* Use type int rather than a union, to represent Lisp_Object */
  89
  90 #define NO_UNION_TYPE
  91
  92 /* crt0.c, if it is used, should use the i386-bsd style of entry.
  93    with no extra dummy args.  On USG and XENIX,
  94    NO_REMAP says this isn't used. */
  95
  96 #define CRT0_DUMMIES bogus_fp,
  97
  98 /* crt0.c should define a symbol `start' and do .globl with a dot.  */
  99
 100 #define DOT_GLOBAL_START
 101
 102 #ifdef XENIX
 103 /* Data type of load average, as read out of kmem.  */
 104 #define LOAD_AVE_TYPE short
 105
 106 /* Convert that into an integer that is 100 for a load average of 1.0  */
 107 #define LOAD_AVE_CVT(x) (((double) (x)) * 100.0 / FSCALE)
 108
 109 #define FSCALE 256.0         /* determined by experimentation...  */
 110 #endif
 111
 112
 113 #ifdef SOLARIS2
 114 /* Data type of load average, as read out of kmem.  */
 115 #define LOAD_AVE_TYPE long
 116
 117 /* Convert that into an integer that is 100 for a load average of 1.0  */
 118 /* This is totally uncalibrated. */
 119 #define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
 120
 121 #ifndef SOLARIS2_4
 122 /* j.w.hawtin@lut.ac.uk says Solaris 2.1 on the X86 needs -lkvm, and it
 123    already has FSCALE defined in a system header.  */
 124 #define LIBS_MACHINE -lkvm
 125
 126 #define HAVE_VFORK
 127
 128 #else /* SOLARIS2_4 */
 129 #ifndef __GNUC__
 130 #if 0 /* wisner@gryphon.com says this screws up cpp */
 131 #define C_SWITCH_MACHINE -Xa
 132 #endif
 133 #ifndef NOT_C_CODE
 134 #ifdef HAVE_ALLOCA_H
 135 #include <alloca.h>
 136 #endif /* HAVE_ALLOCA_H */
 137 #endif /* not NOT_C_CODE */
 138 #endif /* not __GNUC__ */
 139 #endif /* SOLARIS2_4 */
 140
 141 /* configure thinks solaris X86 has gethostname, but it does not work,
 142    so undefine it.  */
 143 #undef HAVE_GETHOSTNAME
 144
 145 #else /* not SOLARIS2 */
 146 #ifdef USG5_4 /* Older USG systems do not support the load average.  */
 147 /* Data type of load average, as read out of kmem.  */
 148
 149 #define LOAD_AVE_TYPE long
 150
 151 /* Convert that into an integer that is 100 for a load average of 1.0  */
 152 /* This is totally uncalibrated. */
 153
 154 #define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
 155 #define FSCALE 256.0
 156 #endif
 157 #endif /* not SOLARIS2 */
 158
 159 /* Define CANNOT_DUMP on machines where unexec does not work.
 160    Then the function dump-emacs will not be defined
 161    and temacs will do (load "loadup") automatically unless told otherwise.  */
 162
 163 /* #define CANNOT_DUMP */
 164
 165 /* Define VIRT_ADDR_VARIES if the virtual addresses of
 166    pure and impure space as loaded can vary, and even their
 167    relative order cannot be relied on.
 168
 169    Otherwise Emacs assumes that text space precedes data space,
 170    numerically.  */
 171
 172 /* #define VIRT_ADDR_VARIES */
 173
 174 #ifdef XENIX
 175 /* Define NO_REMAP if memory segmentation makes it not work well
 176    to change the boundary between the text section and data section
 177    when Emacs is dumped.  If you define this, the preloaded Lisp
 178    code will not be sharable; but that's better than failing completely.  */
 179
 180 #define NO_REMAP
 181
 182 #define STACK_DIRECTION -1
 183
 184 /* Since cannot purify, use standard Xenix 386 startup code. */
 185
 186 #define START_FILES     /lib/386/Sseg.o pre-crt0.o /lib/386/Scrt0.o
 187
 188 /* These really use terminfo.  */
 189
 190 #define LIBS_TERMCAP /lib/386/Slibcurses.a  \
 191    /lib/386/Slibtinfo.a /lib/386/Slibx.a
 192
 193 /* Standard libraries for this machine.  Since `-l' doesn't work in `ld'.  */
 194 /* '__fltused' is unresolved w/o Slibcfp.a */
 195 #define LIB_STANDARD /lib/386/Slibcfp.a /lib/386/Slibc.a
 196 #else /* not XENIX */
 197
 198 /* this brings in alloca() if we're using cc */
 199 #ifdef USG
 200 #ifndef LIB_STANDARD
 201 #ifdef USG5_4
 202 #define LIB_STANDARD -lc
 203 #else /* not USG5_4 */
 204 #define LIB_STANDARD -lPW -lc
 205 #endif /* not USG5_4 */
 206 #endif /* LIB_STANDARD */
 207
 208 #define HAVE_ALLOCA
 209 #define NO_REMAP
 210 #define TEXT_START 0
 211 #endif /* USG */
 212 #endif /* not XENIX */
 213
 214 #ifdef BSD
 215 #define HAVE_ALLOCA
 216 #endif /* BSD */
 217
 218 /* If compiling with GCC, let GCC implement alloca.  */
 219 #if defined(__GNUC__) && !defined(alloca)
 220 #define alloca(n) __builtin_alloca(n)
 221 #define HAVE_ALLOCA
 222 #endif
 223
 224 #ifdef USG5_4
 225 #define DATA_SEG_BITS 0x08000000
 226 #endif
 227
 228 #ifdef MSDOS
 229 #define NO_REMAP
 230 #endif
 231
 232 #ifdef WINDOWSNT
 233 #define VIRT_ADDR_VARIES
 234 #define DATA_END        get_data_end ()
 235 #define DATA_START      get_data_start ()
 236 #define HAVE_ALLOCA
 237 #define NO_ARG_ARRAY
 238 #endif