src/m/intel386.h

   1 /* Machine description file for intel 386.
   2    Copyright (C) 1987, 2002 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    And handa@etl.gov.jp says that -lkvm needs -llelf, at least on 2.5.  */
 110 #define LIBS_MACHINE -lkvm -lelf
 111
 112 #ifndef SOLARIS2_4
 113 /* J.W.hawtin@lut.ac.uk says Solaris 2.1 on the X86 has FSCALE defined in a
 114    system header. */
 115 #else /* SOLARIS2_4 */
 116 #ifndef __GNUC__
 117 #if 0 /* wisner@gryphon.com says this screws up cpp */
 118 #define C_SWITCH_MACHINE -Xa
 119 #endif
 120 #endif /* not __GNUC__ */
 121 #endif /* SOLARIS2_4 */
 122
 123 /* configure thinks solaris X86 has gethostname, but it does not work,
 124    so undefine it.  */
 125 #undef HAVE_GETHOSTNAME
 126
 127 #else /* not SOLARIS2 */
 128 #ifdef USG5_4 /* Older USG systems do not support the load average.  */
 129 /* Data type of load average, as read out of kmem.  */
 130
 131 #define LOAD_AVE_TYPE long
 132
 133 /* Convert that into an integer that is 100 for a load average of 1.0  */
 134 /* This is totally uncalibrated. */
 135
 136 #define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
 137 #define FSCALE 256.0
 138 #endif
 139 #endif /* not SOLARIS2 */
 140
 141 /* Define CANNOT_DUMP on machines where unexec does not work.
 142    Then the function dump-emacs will not be defined
 143    and temacs will do (load "loadup") automatically unless told otherwise.  */
 144
 145 /* #define CANNOT_DUMP */
 146
 147 /* Define VIRT_ADDR_VARIES if the virtual addresses of
 148    pure and impure space as loaded can vary, and even their
 149    relative order cannot be relied on.
 150
 151    Otherwise Emacs assumes that text space precedes data space,
 152    numerically.  */
 153
 154 /* #define VIRT_ADDR_VARIES */
 155
 156 #ifdef XENIX
 157 /* Define NO_REMAP if memory segmentation makes it not work well
 158    to change the boundary between the text section and data section
 159    when Emacs is dumped.  If you define this, the preloaded Lisp
 160    code will not be sharable; but that's better than failing completely.  */
 161
 162 #define NO_REMAP
 163
 164 /* Since cannot purify, use standard Xenix 386 startup code. */
 165
 166 #define START_FILES     /lib/386/Sseg.o pre-crt0.o /lib/386/Scrt0.o
 167
 168 /* These really use terminfo.  */
 169
 170 #define LIBS_TERMCAP /lib/386/Slibcurses.a  \
 171    /lib/386/Slibtinfo.a /lib/386/Slibx.a
 172
 173 /* Standard libraries for this machine.  Since `-l' doesn't work in `ld'.  */
 174 /* '__fltused' is unresolved w/o Slibcfp.a */
 175 #define LIB_STANDARD /lib/386/Slibcfp.a /lib/386/Slibc.a
 176 #else /* not XENIX */
 177
 178 /* this brings in alloca() if we're using cc */
 179 #ifdef USG
 180 #ifndef LIB_STANDARD
 181 #ifdef USG5_4
 182 #define LIB_STANDARD -lc
 183 #else /* not USG5_4 */
 184 #define LIB_STANDARD -lPW -lc
 185 #endif /* not USG5_4 */
 186 #endif /* LIB_STANDARD */
 187
 188 #define NO_REMAP
 189 #define TEXT_START 0
 190 #endif /* USG */
 191 #endif /* not XENIX */
 192
 193 #ifdef USG5_4
 194 #define DATA_SEG_BITS 0x08000000
 195 #endif
 196
 197 #ifdef MSDOS
 198 #define NO_REMAP
 199 #endif
 200
 201 #ifdef WINDOWSNT
 202 #define VIRT_ADDR_VARIES
 203 #define DATA_END        get_data_end ()
 204 #define DATA_START      get_data_start ()
 205 #define NO_ARG_ARRAY
 206 #endif
 207
 208 #ifdef linux
 209 /* libc-linux/sysdeps/linux/i386/ulimit.c says that due to shared library, */
 210 /* we cannot get the maximum address for brk */
 211 #define ULIMIT_BREAK_VALUE (32*1024*1024)
 212
 213 #define SEGMENT_MASK ((SEGMENT_SIZE)-1)
 214 #endif