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comparison src/m/intel386.h @ 0:376386a54a3c r19-14

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Import from CVS: tag r19-14
author cvs
date Mon, 13 Aug 2007 08:45:50 +0200
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-1:000000000000 0:376386a54a3c
1 /* Machine description file for intel 386.
2 Copyright (C) 1987 Free Software Foundation, Inc.
3
4 This file is part of GNU Emacs.
5
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.
10
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.
15
16 You should have received a copy of the GNU General Public License
17 along with XEmacs; 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. */
20
21 /* Synched up with: FSF 19.31. */
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 WORD_MACHINE if addresses and such have
54 * to be corrected before they can be used as byte counts. */
55
56 /* #define WORD_MACHINE */
57
58 /* Now define a symbol for the cpu type, if your compiler
59 does not define it automatically:
60 Ones defined so far include vax, m68000, ns16000, pyramid,
61 orion, tahoe, APOLLO and many others */
62
63 #define INTEL386
64
65 /* crt0.c, if it is used, should use the i386-bsd style of entry.
66 with no extra dummy args. On USG and XENIX,
67 NO_REMAP says this isn't used. */
68
69 /* Mly 16-Jan-96 16:38:32: this is part of a prototype -- same bug present in
70 other m*.h files */
71 #define CRT0_DUMMIES int bogus_fp,
72
73 /* crt0.c should define a symbol `start' and do .globl with a dot. */
74
75 #define DOT_GLOBAL_START
76
77 #ifdef XENIX
78 /* Data type of load average, as read out of kmem. */
79 #define LOAD_AVE_TYPE short
80
81 /* Convert that into an integer that is 100 for a load average of 1.0 */
82 #define LOAD_AVE_CVT(x) (((double) (x)) * 100.0 / FSCALE)
83
84 #define FSCALE 256.0 /* determined by experimentation... */
85 #endif
86
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 #define LIBS_MACHINE -lkvm
99
100 #ifndef SOLARIS2_4
101 /* J.W.hawtin@lut.ac.uk says Solaris 2.1 on the X86 has FSCALE defined in a
102 system header. */
103
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 #ifndef NOT_C_CODE
110 #ifdef HAVE_ALLOCA_H
111 #include <alloca.h>
112 #endif /* HAVE_ALLOCA_H */
113 #endif /* not NOT_C_CODE */
114 #endif /* not __GNUC__ */
115 #endif /* SOLARIS2_4 */
116
117 /* configure thinks solaris X86 has gethostname, but it does not work,
118 so undefine it. */
119 #undef HAVE_GETHOSTNAME
120
121 #else /* not SOLARIS2 */
122 #ifdef USG5_4 /* Older USG systems do not support the load average. */
123 /* Data type of load average, as read out of kmem. */
124
125 #define LOAD_AVE_TYPE long
126
127 /* Convert that into an integer that is 100 for a load average of 1.0 */
128 /* This is totally uncalibrated. */
129
130 #define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
131 #define FSCALE 256.0
132 #endif
133 #endif /* not SOLARIS2 */
134
135 /* Define CANNOT_DUMP on machines where unexec does not work.
136 Then the function dump-emacs will not be defined
137 and temacs will do (load "loadup") automatically unless told otherwise. */
138
139 /* #define CANNOT_DUMP */
140
141 /* Define VIRT_ADDR_VARIES if the virtual addresses of
142 pure and impure space as loaded can vary, and even their
143 relative order cannot be relied on.
144
145 Otherwise Emacs assumes that text space precedes data space,
146 numerically. */
147
148 /* #define VIRT_ADDR_VARIES */
149
150 #ifdef XENIX
151
152 /* Define NO_REMAP if memory segmentation makes it not work well
153 to change the boundary between the text section and data section
154 when Emacs is dumped. If you define this, the preloaded Lisp
155 code will not be sharable; but that's better than failing completely. */
156
157 #define NO_REMAP
158
159 #define STACK_DIRECTION -1
160
161 /* Since cannot purify, use standard Xenix 386 startup code. */
162
163 #define START_FILES /lib/386/Sseg.o pre-crt0.o /lib/386/Scrt0.o
164
165 /* These really use terminfo. */
166
167 #define LIBS_TERMCAP /lib/386/Slibcurses.a \
168 /lib/386/Slibtinfo.a /lib/386/Slibx.a
169
170 /* Standard libraries for this machine. Since `-l' doesn't work in `ld'. */
171 /* '__fltused' is unresolved w/o Slibcfp.a */
172 #define LIB_STANDARD /lib/386/Slibcfp.a /lib/386/Slibc.a
173 #else /* not XENIX */
174
175 /* this brings in alloca() if we're using cc */
176 #ifdef USG
177 #ifndef LIB_STANDARD
178 #ifdef USG5_4
179 #define LIB_STANDARD -lc
180 #else /* not USG5_4 */
181 #define LIB_STANDARD -lPW -lc
182 #endif /* not USG5_4 */
183 #endif /* LIB_STANDARD */
184
185 #define HAVE_ALLOCA
186 #define NO_REMAP
187 #define TEXT_START 0
188 #endif /* USG */
189 #endif /* not XENIX */
190
191 #ifdef BSD
192 #define HAVE_ALLOCA
193 #endif /* BSD */
194
195 /* If compiling with GCC, let GCC implement alloca. */
196 #if defined(__GNUC__) && !defined(alloca)
197 #define alloca(n) __builtin_alloca(n)
198 #define HAVE_ALLOCA
199 #endif
200
201 /* Solaris defines alloca to __builtin_alloca & doesn't provide a prototype. */
202 #ifdef __SUNPRO_C
203 # ifndef NOT_C_CODE
204 # include <alloca.h>
205 void *__builtin_alloca (unsigned int);
206 # endif /* __SUNPRO_C */
207 #endif /* NOT_C_CODE */
208
209 #ifdef USG5_4
210 #define DATA_SEG_BITS 0x08000000
211 #endif
212
213 #ifdef MSDOS
214 #define NO_REMAP
215 #endif
216
217 #ifdef WINDOWSNT
218 #define VIRT_ADDR_VARIES
219 #define DATA_END get_data_end ()
220 #define DATA_START get_data_start ()
221 #define HAVE_ALLOCA
222 #endif
223
224 #ifdef linux
225 /* libc-linux/sysdeps/linux/i386/ulimit.c says that due to shared library, */
226 /* we cannot get the maximum address for brk */
227 #define ULIMIT_BREAK_VALUE (32*1024*1024)
228
229 #define SEGMENT_MASK ((SEGMENT_SIZE)-1)
230 #endif
231
232 #ifdef __GNUC__
233 /* GCC's alloca() is semi-broken. See lisp.h.
234
235 This brokenness has been confirmed under both Linux and NetBSD.
236 It may also exist on non-Intel architectures. */
237 #define BROKEN_ALLOCA_IN_FUNCTION_CALLS
238 #endif
239
240 /* XEmacs change: John Hughes <john@AtlanTech.COM> says using vfork
241 under i386-unknown-sysv4.2 makes C-g sometimes cause a SIGSEGV
242 in TTY mode; the problem goes away if you use fork */
243 #ifdef USG5_4_2
244 #define vfork fork
245 #endif