1 /* Machine description file for intel 386.
2 Copyright (C) 1987 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)
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, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 /* The following line tells the configuration script what sort of
22 operating system this machine is likely to run.
26 Intel 386 (-machine=intel386 or -machine=is386.h)
28 The possibilities for -opsystem are: bsd4-2, usg5-2-2, usg5-3,
29 isc2-2, 386-ix, esix, linux, sco3.2v4, and xenix.
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.
36 It isn't clear what to do on an SCO system.
38 -machine=is386 is used for an Integrated Solutions 386 machine.
39 It may also be correct for Microport systems.
41 Cubix QBx/386 (-machine=intel386 -opsystem=usg5-3)
43 Changes merged in 19.1. Systems before 2/A/0 may fail to compile etags.c
44 due to a compiler bug.
46 Prime EXL (-machine=intel386 -opsystem=usg5-3)
48 Minor changes merged in 19.1.
51 /* The following three symbols give information on
52 the size of various data types. */
55 /* Linux defines these in <values.h>, but they can't be used in #if's */
60 #define SHORTBITS 16 /* Number of bits in a short */
62 #define INTBITS 32 /* Number of bits in an int */
64 #define LONGBITS 32 /* Number of bits in a long */
66 /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
67 is the most significant byte. */
69 #undef WORDS_BIG_ENDIAN
71 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
72 * group of arguments and treat it as an array of the arguments. */
74 /* #define NO_ARG_ARRAY */
76 /* Define WORD_MACHINE if addresses and such have
77 * to be corrected before they can be used as byte counts. */
79 /* #define WORD_MACHINE */
81 /* Now define a symbol for the cpu type, if your compiler
82 does not define it automatically:
83 Ones defined so far include vax, m68000, ns16000, pyramid,
84 orion, tahoe, APOLLO and many others */
88 /* Use type int rather than a union, to represent Lisp_Object */
92 /* crt0.c, if it is used, should use the i386-bsd style of entry.
93 with no extra dummy args. On USG and XENIX,
94 NO_REMAP says this isn't used. */
96 #define CRT0_DUMMIES bogus_fp,
98 /* crt0.c should define a symbol `start' and do .globl with a dot. */
100 #define DOT_GLOBAL_START
103 /* Data type of load average, as read out of kmem. */
104 #define LOAD_AVE_TYPE short
106 /* Convert that into an integer that is 100 for a load average of 1.0 */
107 #define LOAD_AVE_CVT(x) (((double) (x)) * 100.0 / FSCALE)
109 #define FSCALE 256.0 /* determined by experimentation... */
114 /* Data type of load average, as read out of kmem. */
115 #define LOAD_AVE_TYPE long
117 /* Convert that into an integer that is 100 for a load average of 1.0 */
118 /* This is totally uncalibrated. */
119 #define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
122 /* j.w.hawtin@lut.ac.uk says Solaris 2.1 on the X86 needs -lkvm, and it
123 already has FSCALE defined in a system header. */
124 #define LIBS_MACHINE -lkvm
126 /* 14/9/84 J.W.Hawtin@lut.ac.uk Solaris 2.1 X86 does not like -traditional
127 with GCC on the C_SWITCH_SYSTEM flags. */
129 #undef C_SWITCH_SYSTEM
135 /* configure thinks solaris X86 has gethostname, but it does not work,
137 #undef HAVE_GETHOSTNAME
139 #else /* not SOLARIS2 */
140 #ifdef USG5_4 /* Older USG systems do not support the load average. */
141 /* Data type of load average, as read out of kmem. */
143 #define LOAD_AVE_TYPE long
145 /* Convert that into an integer that is 100 for a load average of 1.0 */
146 /* This is totally uncalibrated. */
148 #define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
151 #endif /* not SOLARIS2 */
153 /* Define CANNOT_DUMP on machines where unexec does not work.
154 Then the function dump-emacs will not be defined
155 and temacs will do (load "loadup") automatically unless told otherwise. */
157 /* #define CANNOT_DUMP */
159 /* Define VIRT_ADDR_VARIES if the virtual addresses of
160 pure and impure space as loaded can vary, and even their
161 relative order cannot be relied on.
163 Otherwise Emacs assumes that text space precedes data space,
166 /* #define VIRT_ADDR_VARIES */
169 /* Define NO_REMAP if memory segmentation makes it not work well
170 to change the boundary between the text section and data section
171 when Emacs is dumped. If you define this, the preloaded Lisp
172 code will not be sharable; but that's better than failing completely. */
176 #define STACK_DIRECTION -1
178 /* Since cannot purify, use standard Xenix 386 startup code. */
180 #define START_FILES /lib/386/Sseg.o pre-crt0.o /lib/386/Scrt0.o
182 /* These really use terminfo. */
184 #define LIBS_TERMCAP /lib/386/Slibcurses.a \
185 /lib/386/Slibtinfo.a /lib/386/Slibx.a
187 /* Standard libraries for this machine. Since `-l' doesn't work in `ld'. */
188 /* '__fltused' is unresolved w/o Slibcfp.a */
189 #define LIB_STANDARD /lib/386/Slibcfp.a /lib/386/Slibc.a
190 #else /* not XENIX */
192 /* this brings in alloca() if we're using cc */
196 #define LIB_STANDARD -lc
197 #else /* not USG5_4 */
198 #define LIB_STANDARD -lPW -lc
199 #endif /* not USG5_4 */
200 #endif /* LIB_STANDARD */
206 #endif /* not XENIX */
212 /* If compiling with GCC, let GCC implement alloca. */
213 #if defined(__GNUC__) && !defined(alloca)
214 #define alloca(n) __builtin_alloca(n)
219 #define DATA_SEG_BITS 0x08000000
227 #define VIRT_ADDR_VARIES
228 #define DATA_END get_data_end ()
229 #define DATA_START get_data_start ()