src/m/intel386.h

   1 /* Machine description file for intel 386.
   2    Copyright (C) 1987, 2001, 2002, 2003, 2004, 2005,
   3                  2006, 2007, 2008  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)
  29
  30   The possibilities for -opsystem are: bsd4-2, usg5-2-2, usg5-3,
  31   isc2-2, 386-ix, and linux.
  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 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 if 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 SOLARIS2
  89 /* Data type of load average, as read out of kmem.  */
  90 #define LOAD_AVE_TYPE long
  91
  92 /* Convert that into an integer that is 100 for a load average of 1.0  */
  93 /* This is totally uncalibrated. */
  94 #define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
  95
  96 /* J.W.Hawtin@lut.ac.uk say Solaris 2.4 as well as Solaris 2.1 on X86
  97    requires -lkvm as well.
  98    And handa@etl.gov.jp says that -lkvm needs -llelf, at least on 2.5.  */
  99 #define LIBS_MACHINE -lkvm -lelf
 100
 101 #ifndef SOLARIS2_4
 102 /* J.W.hawtin@lut.ac.uk says Solaris 2.1 on the X86 has FSCALE defined in a
 103    system header. */
 104 #else /* SOLARIS2_4 */
 105 #ifndef __GNUC__
 106 #if 0 /* wisner@gryphon.com says this screws up cpp */
 107 #define C_SWITCH_MACHINE -Xa
 108 #endif
 109 #endif /* not __GNUC__ */
 110 #endif /* SOLARIS2_4 */
 111
 112 /* configure thinks solaris X86 has gethostname, but it does not work,
 113    so undefine it.  */
 114 #undef HAVE_GETHOSTNAME
 115
 116 #else /* not SOLARIS2 */
 117 #ifdef USG5_4 /* Older USG systems do not support the load average.  */
 118 /* Data type of load average, as read out of kmem.  */
 119
 120 #define LOAD_AVE_TYPE long
 121
 122 /* Convert that into an integer that is 100 for a load average of 1.0  */
 123 /* This is totally uncalibrated. */
 124
 125 #define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
 126 #define FSCALE 256.0
 127 #endif
 128 #endif /* not SOLARIS2 */
 129
 130 /* Define CANNOT_DUMP on machines where unexec does not work.
 131    Then the function dump-emacs will not be defined
 132    and temacs will do (load "loadup") automatically unless told otherwise.  */
 133
 134 /* #define CANNOT_DUMP */
 135
 136 /* Define VIRT_ADDR_VARIES if the virtual addresses of
 137    pure and impure space as loaded can vary, and even their
 138    relative order cannot be relied on.
 139
 140    Otherwise Emacs assumes that text space precedes data space,
 141    numerically.  */
 142
 143 /* #define VIRT_ADDR_VARIES */
 144
 145 #ifdef XENIX
 146 /* Define NO_REMAP if memory segmentation makes it not work well
 147    to change the boundary between the text section and data section
 148    when Emacs is dumped.  If you define this, the preloaded Lisp
 149    code will not be sharable; but that's better than failing completely.  */
 150
 151 #define NO_REMAP
 152
 153 /* Since cannot purify, use standard Xenix 386 startup code. */
 154
 155 #define START_FILES     /lib/386/Sseg.o pre-crt0.o /lib/386/Scrt0.o
 156
 157 /* These really use terminfo.  */
 158
 159 #define LIBS_TERMCAP /lib/386/Slibcurses.a  \
 160    /lib/386/Slibtinfo.a /lib/386/Slibx.a
 161
 162 /* Standard libraries for this machine.  Since `-l' doesn't work in `ld'.  */
 163 /* '__fltused' is unresolved w/o Slibcfp.a */
 164 #define LIB_STANDARD /lib/386/Slibcfp.a /lib/386/Slibc.a
 165 #else /* not XENIX */
 166
 167 /* this brings in alloca() if we're using cc */
 168 #ifdef USG
 169 #ifndef LIB_STANDARD
 170 #ifdef USG5_4
 171 #define LIB_STANDARD -lc
 172 #else /* not USG5_4 */
 173 #define LIB_STANDARD -lPW -lc
 174 #endif /* not USG5_4 */
 175 #endif /* LIB_STANDARD */
 176
 177 #define NO_REMAP
 178 #define TEXT_START 0
 179 #endif /* USG */
 180 #endif /* not XENIX */
 181
 182 #ifdef USG5_4
 183 #define DATA_SEG_BITS 0x08000000
 184 #endif
 185
 186 #ifdef MSDOS
 187 #define NO_REMAP
 188 #endif
 189
 190 #ifdef WINDOWSNT
 191 #define VIRT_ADDR_VARIES
 192 #define DATA_END        get_data_end ()
 193 #define DATA_START      get_data_start ()
 194 #define NO_ARG_ARRAY
 195 #endif
 196
 197 #ifdef linux
 198 /* libc-linux/sysdeps/linux/i386/ulimit.c says that due to shared library, */
 199 /* we cannot get the maximum address for brk */
 200 #define ULIMIT_BREAK_VALUE (32*1024*1024)
 201
 202 #define SEGMENT_MASK ((SEGMENT_SIZE)-1)
 203 #endif
 204
 205 /* arch-tag: 746338f0-cb7b-4f49-a98c-cb50817cf2ec
 206    (do not change this comment) */