src/m/intel386.h

   1 /* Machine description file for intel 386.
   2    Copyright (C) 1987, 2001, 2002, 2003, 2004, 2005,
   3                  2006, 2007  Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs; see the file COPYING.  If not, write to
  19 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20 Boston, MA 02110-1301, USA.  */
  21
  22
  23 /* The following line tells the configuration script what sort of
  24    operating system this machine is likely to run.
  25    USUAL-OPSYS="note"
  26
  27 NOTE-START
  28 Intel 386 (-machine=intel386 or -machine=is386.h)
  29
  30   The possibilities for -opsystem are: bsd4-2, usg5-2-2, usg5-3,
  31   isc2-2, 386-ix, esix, linux, sco3.2v4, and xenix.
  32
  33   18.58 should support a wide variety of operating systems.
  34   Use isc2-2 for Interactive 386/ix version 2.2.
  35   Use 386ix for prior versions.
  36   Use esix for Esix.
  37   Use linux for Linux.
  38   It isn't clear what to do on an SCO system.
  39
  40   -machine=is386 is used for an Integrated Solutions 386 machine.
  41   It may also be correct for Microport systems.
  42
  43 Cubix QBx/386 (-machine=intel386 -opsystem=usg5-3)
  44
  45   Changes merged in 19.1.  Systems before 2/A/0 may fail to compile etags.c
  46   due to a compiler bug.
  47
  48 Prime EXL (-machine=intel386 -opsystem=usg5-3)
  49
  50   Minor changes merged in 19.1.
  51 NOTE-END */
  52
  53 /* Define WORDS_BIG_ENDIAN if lowest-numbered byte in a word
  54    is the most significant byte.  */
  55
  56 #undef WORDS_BIG_ENDIAN
  57
  58 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  59  * group of arguments and treat it as an array of the arguments.  */
  60
  61 /* #define NO_ARG_ARRAY */
  62
  63 /* Define WORD_MACHINE if addresses and such have
  64  * to be corrected before they can be used as byte counts.  */
  65
  66 /* #define WORD_MACHINE */
  67
  68 /* Now define a symbol for the cpu type, if your compiler
  69    does not define it automatically:
  70    Ones defined so far include vax, m68000, ns16000, pyramid,
  71    orion, tahoe, APOLLO and many others */
  72
  73 #define INTEL386
  74
  75 /* Use type int rather than a union, to represent Lisp_Object */
  76
  77 #define NO_UNION_TYPE
  78
  79 /* crt0.c, if it is used, should use the i386-bsd style of entry.
  80    with no extra dummy args.  On USG and XENIX,
  81    NO_REMAP says this isn't used. */
  82
  83 #define CRT0_DUMMIES bogus_fp,
  84
  85 /* crt0.c should define a symbol `start' and do .globl with a dot.  */
  86
  87 #define DOT_GLOBAL_START
  88
  89 #ifdef XENIX
  90 /* Data type of load average, as read out of kmem.  */
  91 #define LOAD_AVE_TYPE short
  92
  93 /* Convert that into an integer that is 100 for a load average of 1.0  */
  94 #define LOAD_AVE_CVT(x) (((double) (x)) * 100.0 / FSCALE)
  95
  96 #define FSCALE 256.0         /* determined by experimentation...  */
  97 #endif
  98
  99
 100 #ifdef SOLARIS2
 101 /* Data type of load average, as read out of kmem.  */
 102 #define LOAD_AVE_TYPE long
 103
 104 /* Convert that into an integer that is 100 for a load average of 1.0  */
 105 /* This is totally uncalibrated. */
 106 #define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
 107
 108 /* J.W.Hawtin@lut.ac.uk say Solaris 2.4 as well as Solaris 2.1 on X86
 109    requires -lkvm as well.
 110    And handa@etl.gov.jp says that -lkvm needs -llelf, at least on 2.5.  */
 111 #define LIBS_MACHINE -lkvm -lelf
 112
 113 #ifndef SOLARIS2_4
 114 /* J.W.hawtin@lut.ac.uk says Solaris 2.1 on the X86 has FSCALE defined in a
 115    system header. */
 116 #else /* SOLARIS2_4 */
 117 #ifndef __GNUC__
 118 #if 0 /* wisner@gryphon.com says this screws up cpp */
 119 #define C_SWITCH_MACHINE -Xa
 120 #endif
 121 #endif /* not __GNUC__ */
 122 #endif /* SOLARIS2_4 */
 123
 124 /* configure thinks solaris X86 has gethostname, but it does not work,
 125    so undefine it.  */
 126 #undef HAVE_GETHOSTNAME
 127
 128 #else /* not SOLARIS2 */
 129 #ifdef USG5_4 /* Older USG systems do not support the load average.  */
 130 /* Data type of load average, as read out of kmem.  */
 131
 132 #define LOAD_AVE_TYPE long
 133
 134 /* Convert that into an integer that is 100 for a load average of 1.0  */
 135 /* This is totally uncalibrated. */
 136
 137 #define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
 138 #define FSCALE 256.0
 139 #endif
 140 #endif /* not SOLARIS2 */
 141
 142 /* Define CANNOT_DUMP on machines where unexec does not work.
 143    Then the function dump-emacs will not be defined
 144    and temacs will do (load "loadup") automatically unless told otherwise.  */
 145
 146 /* #define CANNOT_DUMP */
 147
 148 /* Define VIRT_ADDR_VARIES if the virtual addresses of
 149    pure and impure space as loaded can vary, and even their
 150    relative order cannot be relied on.
 151
 152    Otherwise Emacs assumes that text space precedes data space,
 153    numerically.  */
 154
 155 /* #define VIRT_ADDR_VARIES */
 156
 157 #ifdef XENIX
 158 /* Define NO_REMAP if memory segmentation makes it not work well
 159    to change the boundary between the text section and data section
 160    when Emacs is dumped.  If you define this, the preloaded Lisp
 161    code will not be sharable; but that's better than failing completely.  */
 162
 163 #define NO_REMAP
 164
 165 /* Since cannot purify, use standard Xenix 386 startup code. */
 166
 167 #define START_FILES     /lib/386/Sseg.o pre-crt0.o /lib/386/Scrt0.o
 168
 169 /* These really use terminfo.  */
 170
 171 #define LIBS_TERMCAP /lib/386/Slibcurses.a  \
 172    /lib/386/Slibtinfo.a /lib/386/Slibx.a
 173
 174 /* Standard libraries for this machine.  Since `-l' doesn't work in `ld'.  */
 175 /* '__fltused' is unresolved w/o Slibcfp.a */
 176 #define LIB_STANDARD /lib/386/Slibcfp.a /lib/386/Slibc.a
 177 #else /* not XENIX */
 178
 179 /* this brings in alloca() if we're using cc */
 180 #ifdef USG
 181 #ifndef LIB_STANDARD
 182 #ifdef USG5_4
 183 #define LIB_STANDARD -lc
 184 #else /* not USG5_4 */
 185 #define LIB_STANDARD -lPW -lc
 186 #endif /* not USG5_4 */
 187 #endif /* LIB_STANDARD */
 188
 189 #define NO_REMAP
 190 #define TEXT_START 0
 191 #endif /* USG */
 192 #endif /* not XENIX */
 193
 194 #ifdef USG5_4
 195 #define DATA_SEG_BITS 0x08000000
 196 #endif
 197
 198 #ifdef MSDOS
 199 #define NO_REMAP
 200 #endif
 201
 202 #ifdef WINDOWSNT
 203 #define VIRT_ADDR_VARIES
 204 #define DATA_END        get_data_end ()
 205 #define DATA_START      get_data_start ()
 206 #define NO_ARG_ARRAY
 207 #endif
 208
 209 #ifdef linux
 210 /* libc-linux/sysdeps/linux/i386/ulimit.c says that due to shared library, */
 211 /* we cannot get the maximum address for brk */
 212 #define ULIMIT_BREAK_VALUE (32*1024*1024)
 213
 214 #define SEGMENT_MASK ((SEGMENT_SIZE)-1)
 215 #endif
 216
 217 /* arch-tag: 746338f0-cb7b-4f49-a98c-cb50817cf2ec
 218    (do not change this comment) */