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comparison src/m/intel386.h @ 428:3ecd8885ac67 r21-2-22

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Import from CVS: tag r21-2-22
author cvs
date Mon, 13 Aug 2007 11:28:15 +0200
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427:0a0253eac470 428:3ecd8885ac67
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 /* configure thinks solaris X86 has gethostname, but it does not work,
97 so undefine it. */
98 #undef HAVE_GETHOSTNAME
99
100 #else /* not SOLARIS2 */
101 #ifdef USG5_4 /* Older USG systems do not support the load average. */
102 /* Data type of load average, as read out of kmem. */
103
104 #define LOAD_AVE_TYPE long
105
106 /* Convert that into an integer that is 100 for a load average of 1.0 */
107 /* This is totally uncalibrated. */
108
109 #define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
110 #define FSCALE 256.0
111 #endif
112 #endif /* not SOLARIS2 */
113
114 /* Define CANNOT_DUMP on machines where unexec does not work.
115 Then the function dump-emacs will not be defined
116 and temacs will do (load "loadup") automatically unless told otherwise. */
117
118 /* #define CANNOT_DUMP */
119
120 /* Define VIRT_ADDR_VARIES if the virtual addresses of
121 pure and impure space as loaded can vary, and even their
122 relative order cannot be relied on.
123
124 Otherwise Emacs assumes that text space precedes data space,
125 numerically. */
126
127 /* #define VIRT_ADDR_VARIES */
128
129 #ifdef XENIX
130
131 /* Define NO_REMAP if memory segmentation makes it not work well
132 to change the boundary between the text section and data section
133 when Emacs is dumped. If you define this, the preloaded Lisp
134 code will not be sharable; but that's better than failing completely. */
135
136 #define NO_REMAP
137
138 #define STACK_DIRECTION -1
139
140 /* Since cannot purify, use standard Xenix 386 startup code. */
141
142 #define START_FILES "/lib/386/Sseg.o pre-crt0.o /lib/386/Scrt0.o"
143
144 /* These really use terminfo. */
145
146 #define LIBS_TERMCAP "/lib/386/Slibcurses.a /lib/386/Slibtinfo.a /lib/386/Slibx.a"
147
148 /* Standard libraries for this machine. Since `-l' doesn't work in `ld'. */
149 /* '__fltused' is unresolved w/o Slibcfp.a */
150 #define LIB_STANDARD "/lib/386/Slibcfp.a /lib/386/Slibc.a"
151 #else /* not XENIX */
152
153 #ifdef USG
154
155 #if 0 /* ALLOCA is now autodetected */
156 #define HAVE_ALLOCA
157 #endif
158 #define NO_REMAP
159 #define TEXT_START 0
160 #endif /* USG */
161 #endif /* not XENIX */
162
163 #ifdef USG5_4
164 #define DATA_SEG_BITS 0x08000000
165 #endif
166
167 #ifdef MSDOS
168 #define NO_REMAP
169 #endif
170
171 #ifdef linux
172 /* libc-linux/sysdeps/linux/i386/ulimit.c says that due to shared library, */
173 /* we cannot get the maximum address for brk */
174 #define ULIMIT_BREAK_VALUE (32*1024*1024)
175
176 #define SEGMENT_MASK ((SEGMENT_SIZE)-1)
177 #endif
178
179 #ifdef __GNUC__
180 /* GCC's alloca() is semi-broken. See lisp.h.
181
182 This brokenness has been confirmed under both Linux and NetBSD.
183 It may also exist on non-Intel architectures. */
184 #define BROKEN_ALLOCA_IN_FUNCTION_CALLS
185 #endif
186
187 /* XEmacs change: John Hughes <john@AtlanTech.COM> says using vfork
188 under i386-unknown-sysv4.2 makes C-g sometimes cause a SIGSEGV
189 in TTY mode; the problem goes away if you use fork */
190 #ifdef USG5_4_2
191 #define vfork fork
192 #endif