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, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21
  22 /* The following line tells the configuration script what sort of
  23    operating system this machine is likely to run.
  24    USUAL-OPSYS="note"
  25
  26 NOTE-START
  27 Intel 386 (-machine=intel386 or -machine=is386.h)
  28
  29   The possibilities for -opsystem are: bsd4-2, usg5-2-2, usg5-3,
  30   isc2-2, 386-ix, esix, linux, sco3.2v4, and xenix.
  31
  32   18.58 should support a wide variety of operating systems.
  33   Use isc2-2 for Interactive 386/ix version 2.2.
  34   Use 386ix for prior versions.
  35   Use esix for Esix.
  36   Use linux for Linux.
  37   It isn't clear what to do on an SCO system.
  38
  39   -machine=is386 is used for an Integrated Solutions 386 machine.
  40   It may also be correct for Microport systems.
  41
  42 Cubix QBx/386 (-machine=intel386 -opsystem=usg5-3)
  43
  44   Changes merged in 19.1.  Systems before 2/A/0 may fail to compile etags.c
  45   due to a compiler bug.
  46
  47 Prime EXL (-machine=intel386 -opsystem=usg5-3)
  48
  49   Minor changes merged in 19.1.
  50 NOTE-END */
  51
  52 /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
  53    is the most significant byte.  */
  54
  55 #undef WORDS_BIG_ENDIAN
  56
  57 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  58  * group of arguments and treat it as an array of the arguments.  */
  59
  60 /* #define NO_ARG_ARRAY */
  61
  62 /* Define WORD_MACHINE if addresses and such have
  63  * to be corrected before they can be used as byte counts.  */
  64
  65 /* #define WORD_MACHINE */
  66
  67 /* Now define a symbol for the cpu type, if your compiler
  68    does not define it automatically:
  69    Ones defined so far include vax, m68000, ns16000, pyramid,
  70    orion, tahoe, APOLLO and many others */
  71
  72 #define INTEL386
  73
  74 /* Use type int rather than a union, to represent Lisp_Object */
  75
  76 #define NO_UNION_TYPE
  77
  78 /* crt0.c, if it is used, should use the i386-bsd style of entry.
  79    with no extra dummy args.  On USG and XENIX,
  80    NO_REMAP says this isn't used. */
  81
  82 #define CRT0_DUMMIES bogus_fp,
  83
  84 /* crt0.c should define a symbol `start' and do .globl with a dot.  */
  85
  86 #define DOT_GLOBAL_START
  87
  88 #ifdef XENIX
  89 /* Data type of load average, as read out of kmem.  */
  90 #define LOAD_AVE_TYPE short
  91
  92 /* Convert that into an integer that is 100 for a load average of 1.0  */
  93 #define LOAD_AVE_CVT(x) (((double) (x)) * 100.0 / FSCALE)
  94
  95 #define FSCALE 256.0         /* determined by experimentation...  */
  96 #endif
  97
  98
  99 #ifdef SOLARIS2
 100 /* Data type of load average, as read out of kmem.  */
 101 #define LOAD_AVE_TYPE long
 102
 103 /* Convert that into an integer that is 100 for a load average of 1.0  */
 104 /* This is totally uncalibrated. */
 105 #define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
 106
 107 /* J.W.Hawtin@lut.ac.uk say Solaris 2.4 as well as Solaris 2.1 on X86
 108    requires -lkvm as well */
 109 #define LIBS_MACHINE -lkvm
 110
 111 #ifndef SOLARIS2_4
 112 /* J.W.hawtin@lut.ac.uk says Solaris 2.1 on the X86 has FSCALE defined in a
 113    system header. */
 114
 115 #define HAVE_VFORK
 116
 117 #else /* SOLARIS2_4 */
 118 #ifndef __GNUC__
 119 #if 0 /* wisner@gryphon.com says this screws up cpp */
 120 #define C_SWITCH_MACHINE -Xa
 121 #endif
 122 #ifndef NOT_C_CODE
 123 #ifdef HAVE_ALLOCA_H
 124 #include <alloca.h>
 125 #endif /* HAVE_ALLOCA_H */
 126 #endif /* not NOT_C_CODE */
 127 #endif /* not __GNUC__ */
 128 #endif /* SOLARIS2_4 */
 129
 130 /* configure thinks solaris X86 has gethostname, but it does not work,
 131    so undefine it.  */
 132 #undef HAVE_GETHOSTNAME
 133
 134 #else /* not SOLARIS2 */
 135 #ifdef USG5_4 /* Older USG systems do not support the load average.  */
 136 /* Data type of load average, as read out of kmem.  */
 137
 138 #define LOAD_AVE_TYPE long
 139
 140 /* Convert that into an integer that is 100 for a load average of 1.0  */
 141 /* This is totally uncalibrated. */
 142
 143 #define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
 144 #define FSCALE 256.0
 145 #endif
 146 #endif /* not SOLARIS2 */
 147
 148 /* Define CANNOT_DUMP on machines where unexec does not work.
 149    Then the function dump-emacs will not be defined
 150    and temacs will do (load "loadup") automatically unless told otherwise.  */
 151
 152 /* #define CANNOT_DUMP */
 153
 154 /* Define VIRT_ADDR_VARIES if the virtual addresses of
 155    pure and impure space as loaded can vary, and even their
 156    relative order cannot be relied on.
 157
 158    Otherwise Emacs assumes that text space precedes data space,
 159    numerically.  */
 160
 161 /* #define VIRT_ADDR_VARIES */
 162
 163 #ifdef XENIX
 164 /* Define NO_REMAP if memory segmentation makes it not work well
 165    to change the boundary between the text section and data section
 166    when Emacs is dumped.  If you define this, the preloaded Lisp
 167    code will not be sharable; but that's better than failing completely.  */
 168
 169 #define NO_REMAP
 170
 171 #define STACK_DIRECTION -1
 172
 173 /* Since cannot purify, use standard Xenix 386 startup code. */
 174
 175 #define START_FILES     /lib/386/Sseg.o pre-crt0.o /lib/386/Scrt0.o
 176
 177 /* These really use terminfo.  */
 178
 179 #define LIBS_TERMCAP /lib/386/Slibcurses.a  \
 180    /lib/386/Slibtinfo.a /lib/386/Slibx.a
 181
 182 /* Standard libraries for this machine.  Since `-l' doesn't work in `ld'.  */
 183 /* '__fltused' is unresolved w/o Slibcfp.a */
 184 #define LIB_STANDARD /lib/386/Slibcfp.a /lib/386/Slibc.a
 185 #else /* not XENIX */
 186
 187 /* this brings in alloca() if we're using cc */
 188 #ifdef USG
 189 #ifndef LIB_STANDARD
 190 #ifdef USG5_4
 191 #define LIB_STANDARD -lc
 192 #else /* not USG5_4 */
 193 #define LIB_STANDARD -lPW -lc
 194 #endif /* not USG5_4 */
 195 #endif /* LIB_STANDARD */
 196
 197 #define HAVE_ALLOCA
 198 #define NO_REMAP
 199 #define TEXT_START 0
 200 #endif /* USG */
 201 #endif /* not XENIX */
 202
 203 #ifdef BSD
 204 #define HAVE_ALLOCA
 205 #endif /* BSD */
 206
 207 /* If compiling with GCC, let GCC implement alloca.  */
 208 #if defined(__GNUC__) && !defined(alloca)
 209 #define alloca(n) __builtin_alloca(n)
 210 #define HAVE_ALLOCA
 211 #endif
 212
 213 #ifdef USG5_4
 214 #define DATA_SEG_BITS 0x08000000
 215 #endif
 216
 217 #ifdef MSDOS
 218 #define NO_REMAP
 219 #endif
 220
 221 #ifdef WINDOWSNT
 222 #define VIRT_ADDR_VARIES
 223 #define DATA_END        get_data_end ()
 224 #define DATA_START      get_data_start ()
 225 #define HAVE_ALLOCA
 226 #define NO_ARG_ARRAY
 227 #endif
 228
 229 #ifdef linux
 230 /* libc-linux/sysdeps/linux/i386/ulimit.c says that due to shared library, */
 231 /* we cannot get the maximum address for brk */
 232 #define ULIMIT_BREAK_VALUE (32*1024*1024)
 233
 234 #define SEGMENT_MASK ((SEGMENT_SIZE)-1)
 235 #endif