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comparison src/m/elxsi.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 /* machine description file for Elxsi machine (running enix).
2 Copyright (C) 1986, 1992 Free Software Foundation, Inc.
3 Adapted by John Salmon
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 2, or (at your option)
10 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 XEmacs; see the file COPYING. If not, write to
19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
21
22 /* Synched up with: FSF 19.31. */
23
24 /* The following line tells the configuration script what sort of
25 operating system this machine is likely to run.
26 USUAL-OPSYS="usg5-2" */
27
28 /* This file was modified by Matt Crawford <matt@tank.uchicago.edu>
29 to work under Elxsi's 12.0 release of BSD unix. */
30
31 /* Define WORD_MACHINE if addresses and such have
32 * to be corrected before they can be used as byte counts. */
33
34 /*#define WORD_MACHINE */
35
36 /* Now define a symbol for the cpu type, if your compiler
37 does not define it automatically:
38 vax, m68000, ns16000, pyramid, orion, tahoe and APOLLO
39 are the ones defined so far. */
40
41 #ifndef elxsi
42 #define elxsi
43 #endif
44
45 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
46 the bit field into an int. In other words, if bit fields
47 are always unsigned.
48
49 If you use NO_UNION_TYPE, this flag does not matter. */
50
51 #define EXPLICIT_SIGN_EXTEND
52
53
54 /* Name of kernel load average variable */
55
56 #undef LDAV_SYMBOL
57 #define LDAV_SYMBOL "avenrun"
58
59 /* Data type of load average, as read out of kmem. */
60
61 #define LOAD_AVE_TYPE double
62
63 /* Convert that into an integer that is 100 for a load average of 1.0 */
64
65 #define LOAD_AVE_CVT(x) (int) ((x) * 100.0)
66
67 /* Define CANNOT_DUMP on machines where unexec does not work.
68 Then the function dump-emacs will not be defined
69 and temacs will do (load "loadup") automatically unless told otherwise.
70
71 Earlier versions couldn't dump.
72 Changes for 12.0 release are in 19.1.
73 Dumping should work now. */
74
75 /* #define CANNOT_DUMP */
76
77 /* Define VIRT_ADDR_VARIES if the virtual addresses of
78 pure and impure space as loaded can vary, and even their
79 relative order cannot be relied on.
80
81 Otherwise Emacs assumes that text space precedes data space,
82 numerically. */
83
84 /* #define VIRT_ADDR_VARIES */
85
86 /* Define C_ALLOCA if this machine does not support a true alloca
87 and the one written in C should be used instead.
88 Define HAVE_ALLOCA to say that the system provides a properly
89 working alloca function and it should be used.
90 Define neither one if an assembler-language alloca
91 in the file alloca.s should be used. */
92
93 #define C_ALLOCA
94 /*#define HAVE_ALLOCA */
95
96 /* Define NO_REMAP if memory segmentation makes it not work well
97 to change the boundary between the text section and data section
98 when Emacs is dumped. If you define this, the preloaded Lisp
99 code will not be sharable; but that's better than failing completely. */
100 /*#define NO_REMAP*/
101
102 /* This is a guess for an alternate solution to whatever
103 problem motivated defining _sobuf in sysdep,c with extern char *_sobuf. */
104 #define _sobuf xsobuf
105
106 /* Address of start of text segment as loaded. */
107
108 #define TEXT_START 0x800
109
110 /* Tell crt0.c not to define environ. */
111
112 #define DONT_NEED_ENVIRON
113
114 /* The elxsi has no debugger, so might as well optimize instead
115 of trying to make a symbol table. */
116
117 #define C_DEBUG_SWITCH -O
118
119 /* Elxsi uses COFF under both Sys V and BSD environments */
120
121 #define COFF
122
123 #define ADJUST_EXEC_HEADER {\
124 extern int _init_brk;\
125 _init_brk = bss_start;\
126 }