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 /* J.W.Hawtin@lut.ac.uk say Solaris 2.4 as well as Solaris 2.1 on X86
 122    requires -lkvm as well */
 123 #define LIBS_MACHINE -lkvm
 124
 125 #ifndef SOLARIS2_4
 126 /* J.W.hawtin@lut.ac.uk says Solaris 2.1 on the X86 has FSCALE defined in a
 127    system header. */
 128
 129 #define HAVE_VFORK
 130
 131 #else /* SOLARIS2_4 */
 132 #ifndef __GNUC__
 133 #if 0 /* wisner@gryphon.com says this screws up cpp */
 134 #define C_SWITCH_MACHINE -Xa
 135 #endif
 136 #ifndef NOT_C_CODE
 137 #ifdef HAVE_ALLOCA_H
 138 #include <alloca.h>
 139 #endif /* HAVE_ALLOCA_H */
 140 #endif /* not NOT_C_CODE */
 141 #endif /* not __GNUC__ */
 142 #endif /* SOLARIS2_4 */
 143
 144 /* configure thinks solaris X86 has gethostname, but it does not work,
 145    so undefine it.  */
 146 #undef HAVE_GETHOSTNAME
 147
 148 #else /* not SOLARIS2 */
 149 #ifdef USG5_4 /* Older USG systems do not support the load average.  */
 150 /* Data type of load average, as read out of kmem.  */
 151
 152 #define LOAD_AVE_TYPE long
 153
 154 /* Convert that into an integer that is 100 for a load average of 1.0  */
 155 /* This is totally uncalibrated. */
 156
 157 #define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
 158 #define FSCALE 256.0
 159 #endif
 160 #endif /* not SOLARIS2 */
 161
 162 /* Define CANNOT_DUMP on machines where unexec does not work.
 163    Then the function dump-emacs will not be defined
 164    and temacs will do (load "loadup") automatically unless told otherwise.  */
 165
 166 /* #define CANNOT_DUMP */
 167
 168 /* Define VIRT_ADDR_VARIES if the virtual addresses of
 169    pure and impure space as loaded can vary, and even their
 170    relative order cannot be relied on.
 171
 172    Otherwise Emacs assumes that text space precedes data space,
 173    numerically.  */
 174
 175 /* #define VIRT_ADDR_VARIES */
 176
 177 #ifdef XENIX
 178 /* Define NO_REMAP if memory segmentation makes it not work well
 179    to change the boundary between the text section and data section
 180    when Emacs is dumped.  If you define this, the preloaded Lisp
 181    code will not be sharable; but that's better than failing completely.  */
 182
 183 #define NO_REMAP
 184
 185 #define STACK_DIRECTION -1
 186
 187 /* Since cannot purify, use standard Xenix 386 startup code. */
 188
 189 #define START_FILES     /lib/386/Sseg.o pre-crt0.o /lib/386/Scrt0.o
 190
 191 /* These really use terminfo.  */
 192
 193 #define LIBS_TERMCAP /lib/386/Slibcurses.a  \
 194    /lib/386/Slibtinfo.a /lib/386/Slibx.a
 195
 196 /* Standard libraries for this machine.  Since `-l' doesn't work in `ld'.  */
 197 /* '__fltused' is unresolved w/o Slibcfp.a */
 198 #define LIB_STANDARD /lib/386/Slibcfp.a /lib/386/Slibc.a
 199 #else /* not XENIX */
 200
 201 /* this brings in alloca() if we're using cc */
 202 #ifdef USG
 203 #ifndef LIB_STANDARD
 204 #ifdef USG5_4
 205 #define LIB_STANDARD -lc
 206 #else /* not USG5_4 */
 207 #define LIB_STANDARD -lPW -lc
 208 #endif /* not USG5_4 */
 209 #endif /* LIB_STANDARD */
 210
 211 #define HAVE_ALLOCA
 212 #define NO_REMAP
 213 #define TEXT_START 0
 214 #endif /* USG */
 215 #endif /* not XENIX */
 216
 217 #ifdef BSD
 218 #define HAVE_ALLOCA
 219 #endif /* BSD */
 220
 221 /* If compiling with GCC, let GCC implement alloca.  */
 222 #if defined(__GNUC__) && !defined(alloca)
 223 #define alloca(n) __builtin_alloca(n)
 224 #define HAVE_ALLOCA
 225 #endif
 226
 227 #ifdef USG5_4
 228 #define DATA_SEG_BITS 0x08000000
 229 #endif
 230
 231 #ifdef MSDOS
 232 #define NO_REMAP
 233 #endif
 234
 235 #ifdef WINDOWSNT
 236 #define VIRT_ADDR_VARIES
 237 #define DATA_END        get_data_end ()
 238 #define DATA_START      get_data_start ()
 239 #define HAVE_ALLOCA
 240 #define NO_ARG_ARRAY
 241 #endif