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[emacs.git] / src / m / intel386.h
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1 /* Machine description file for intel 386.
2 Copyright (C) 1987, 2002 Free Software Foundation, Inc.
4 This file is part of GNU Emacs.
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.
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.
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. */
22 /* The following line tells the configuration script what sort of
23 operating system this machine is likely to run.
24 USUAL-OPSYS="note"
26 NOTE-START
27 Intel 386 (-machine=intel386 or -machine=is386.h)
29 The possibilities for -opsystem are: bsd4-2, usg5-2-2, usg5-3,
30 isc2-2, 386-ix, esix, linux, sco3.2v4, and xenix.
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.
39 -machine=is386 is used for an Integrated Solutions 386 machine.
40 It may also be correct for Microport systems.
42 Cubix QBx/386 (-machine=intel386 -opsystem=usg5-3)
44 Changes merged in 19.1. Systems before 2/A/0 may fail to compile etags.c
45 due to a compiler bug.
47 Prime EXL (-machine=intel386 -opsystem=usg5-3)
49 Minor changes merged in 19.1.
50 NOTE-END */
52 /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
53 is the most significant byte. */
55 #undef WORDS_BIG_ENDIAN
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. */
60 /* #define NO_ARG_ARRAY */
62 /* Define WORD_MACHINE if addresses and such have
63 * to be corrected before they can be used as byte counts. */
65 /* #define WORD_MACHINE */
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 */
72 #define INTEL386
74 /* Use type int rather than a union, to represent Lisp_Object */
76 #define NO_UNION_TYPE
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. */
82 #define CRT0_DUMMIES bogus_fp,
84 /* crt0.c should define a symbol `start' and do .globl with a dot. */
86 #define DOT_GLOBAL_START
88 #ifdef XENIX
89 /* Data type of load average, as read out of kmem. */
90 #define LOAD_AVE_TYPE short
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)
95 #define FSCALE 256.0 /* determined by experimentation... */
96 #endif
99 #ifdef SOLARIS2
100 /* Data type of load average, as read out of kmem. */
101 #define LOAD_AVE_TYPE long
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))
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
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 */
123 /* configure thinks solaris X86 has gethostname, but it does not work,
124 so undefine it. */
125 #undef HAVE_GETHOSTNAME
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. */
131 #define LOAD_AVE_TYPE long
133 /* Convert that into an integer that is 100 for a load average of 1.0 */
134 /* This is totally uncalibrated. */
136 #define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
137 #define FSCALE 256.0
138 #endif
139 #endif /* not SOLARIS2 */
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. */
145 /* #define CANNOT_DUMP */
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.
151 Otherwise Emacs assumes that text space precedes data space,
152 numerically. */
154 /* #define VIRT_ADDR_VARIES */
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. */
162 #define NO_REMAP
164 /* Since cannot purify, use standard Xenix 386 startup code. */
166 #define START_FILES /lib/386/Sseg.o pre-crt0.o /lib/386/Scrt0.o
168 /* These really use terminfo. */
170 #define LIBS_TERMCAP /lib/386/Slibcurses.a \
171 /lib/386/Slibtinfo.a /lib/386/Slibx.a
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 */
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 */
188 #define NO_REMAP
189 #define TEXT_START 0
190 #endif /* USG */
191 #endif /* not XENIX */
193 #ifdef USG5_4
194 #define DATA_SEG_BITS 0x08000000
195 #endif
197 #ifdef MSDOS
198 #define NO_REMAP
199 #endif
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
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)
213 #define SEGMENT_MASK ((SEGMENT_SIZE)-1)
214 #endif
216 /* arch-tag: 746338f0-cb7b-4f49-a98c-cb50817cf2ec
217 (do not change this comment) */