src/m/intel386.h

   1 /* Machine description file for intel 386.
   2    Copyright (C) 1987, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
   3                  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 of the License, or
  10 (at your option) 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.  If not, see <http://www.gnu.org/licenses/>.  */
  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)
  27
  28   The possibilities for -opsystem are: bsd4-2, usg5-2-2, usg5-3,
  29   isc2-2, 386-ix, and linux.
  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 linux for Linux.
  35   It isn't clear what to do on an SCO system.
  36
  37   -machine=is386 is used for an Integrated Solutions 386 machine.
  38   It may also be correct for Microport systems.
  39
  40 Cubix QBx/386 (-machine=intel386 -opsystem=usg5-3)
  41
  42   Changes merged in 19.1.  Systems before 2/A/0 may fail to compile etags.c
  43   due to a compiler bug.
  44
  45 Prime EXL (-machine=intel386 -opsystem=usg5-3)
  46
  47   Minor changes merged in 19.1.
  48 NOTE-END */
  49
  50 /* Define WORDS_BIG_ENDIAN if lowest-numbered byte in a word
  51    is the most significant byte.  */
  52
  53 #undef WORDS_BIG_ENDIAN
  54
  55 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  56  * group of arguments and treat it as an array of the arguments.  */
  57
  58 /* #define NO_ARG_ARRAY */
  59
  60 /* Define WORD_MACHINE if addresses and such have
  61  * to be corrected before they can be used as byte counts.  */
  62
  63 /* #define WORD_MACHINE */
  64
  65 /* Now define a symbol for the cpu type, if your compiler
  66    does not define it automatically:
  67    Ones defined so far include vax, m68000, ns16000, pyramid,
  68    orion, tahoe, APOLLO and many others */
  69
  70 #define INTEL386
  71
  72 /* Use type int rather than a union, to represent Lisp_Object */
  73
  74 #define NO_UNION_TYPE
  75
  76 /* crt0.c, if it is used, should use the i386-bsd style of entry.
  77    with no extra dummy args.  On USG and XENIX,
  78    NO_REMAP says this isn't used. */
  79
  80 #define CRT0_DUMMIES bogus_fp,
  81
  82 /* crt0.c should define a symbol `start' and do .globl with a dot.  */
  83
  84 #define DOT_GLOBAL_START
  85
  86 #ifdef SOLARIS2
  87 /* Data type of load average, as read out of kmem.  */
  88 #define LOAD_AVE_TYPE long
  89
  90 /* Convert that into an integer that is 100 for a load average of 1.0  */
  91 /* This is totally uncalibrated. */
  92 #define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
  93
  94 /* J.W.Hawtin@lut.ac.uk say Solaris 2.4 as well as Solaris 2.1 on X86
  95    requires -lkvm as well.
  96    And handa@etl.gov.jp says that -lkvm needs -llelf, at least on 2.5.  */
  97 #define LIBS_MACHINE -lkvm -lelf
  98
  99 #ifndef SOLARIS2_4
 100 /* J.W.hawtin@lut.ac.uk says Solaris 2.1 on the X86 has FSCALE defined in a
 101    system header. */
 102 #else /* SOLARIS2_4 */
 103 #ifndef __GNUC__
 104 #if 0 /* wisner@gryphon.com says this screws up cpp */
 105 #define C_SWITCH_MACHINE -Xa
 106 #endif
 107 #endif /* not __GNUC__ */
 108 #endif /* SOLARIS2_4 */
 109
 110 /* configure thinks solaris X86 has gethostname, but it does not work,
 111    so undefine it.  */
 112 #undef HAVE_GETHOSTNAME
 113
 114 #else /* not SOLARIS2 */
 115 #ifdef USG5_4 /* Older USG systems do not support the load average.  */
 116 /* Data type of load average, as read out of kmem.  */
 117
 118 #define LOAD_AVE_TYPE long
 119
 120 /* Convert that into an integer that is 100 for a load average of 1.0  */
 121 /* This is totally uncalibrated. */
 122
 123 #define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
 124 #define FSCALE 256.0
 125 #endif
 126 #endif /* not SOLARIS2 */
 127
 128 /* Define CANNOT_DUMP on machines where unexec does not work.
 129    Then the function dump-emacs will not be defined
 130    and temacs will do (load "loadup") automatically unless told otherwise.  */
 131
 132 /* #define CANNOT_DUMP */
 133
 134 /* Define VIRT_ADDR_VARIES if the virtual addresses of
 135    pure and impure space as loaded can vary, and even their
 136    relative order cannot be relied on.
 137
 138    Otherwise Emacs assumes that text space precedes data space,
 139    numerically.  */
 140
 141 /* #define VIRT_ADDR_VARIES */
 142
 143 /* this brings in alloca() if we're using cc */
 144 #ifdef USG
 145 #ifndef LIB_STANDARD
 146 #ifdef USG5_4
 147 #define LIB_STANDARD -lc
 148 #else /* not USG5_4 */
 149 #define LIB_STANDARD -lPW -lc
 150 #endif /* not USG5_4 */
 151 #endif /* LIB_STANDARD */
 152
 153 #define NO_REMAP
 154 #define TEXT_START 0
 155 #endif /* USG */
 156
 157 #ifdef USG5_4
 158 #define DATA_SEG_BITS 0x08000000
 159 #endif
 160
 161 #ifdef MSDOS
 162 #define NO_REMAP
 163 #endif
 164
 165 #ifdef WINDOWSNT
 166 #define VIRT_ADDR_VARIES
 167 #define DATA_END        get_data_end ()
 168 #define DATA_START      get_data_start ()
 169 #define NO_ARG_ARRAY
 170 #endif
 171
 172 #ifdef linux
 173 /* libc-linux/sysdeps/linux/i386/ulimit.c says that due to shared library, */
 174 /* we cannot get the maximum address for brk */
 175 #define ULIMIT_BREAK_VALUE (32*1024*1024)
 176
 177 #define SEGMENT_MASK ((SEGMENT_SIZE)-1)
 178 #endif
 179
 180 #if defined (MAC_OSX) || defined (DARWIN)
 181 #ifdef _LP64
 182 /* For Intel Mac, with CC='gcc -arch x86_64'.  */
 183 #define NO_ARG_ARRAY
 184 #endif
 185 #endif
 186
 187 /* arch-tag: 746338f0-cb7b-4f49-a98c-cb50817cf2ec
 188    (do not change this comment) */