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20c428fd | 1 | /* machine description file for Elxsi machine (running enix). |
b9706ae4 | 2 | Copyright (C) 1986, 1992 Free Software Foundation, Inc. |
20c428fd JB |
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 | |
17385adc | 9 | the Free Software Foundation; either version 2, or (at your option) |
20c428fd JB |
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 GNU Emacs; see the file COPYING. If not, write to | |
3b7ad313 EN |
19 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
20 | Boston, MA 02111-1307, USA. */ | |
20c428fd JB |
21 | |
22 | /* The following line tells the configuration script what sort of | |
23 | operating system this machine is likely to run. | |
24 | USUAL-OPSYS="usg5-2" */ | |
25 | ||
26 | /* This file was modified by Matt Crawford <matt@tank.uchicago.edu> | |
27 | to work under Elxsi's 12.0 release of BSD unix. */ | |
28 | ||
74d3f806 KH |
29 | /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word |
30 | is the most significant byte. */ | |
31 | ||
32 | #undef WORDS_BIG_ENDIAN | |
33 | ||
20c428fd JB |
34 | /* Define NO_ARG_ARRAY if you cannot take the address of the first of a |
35 | * group of arguments and treat it as an array of the arguments. */ | |
36 | ||
37 | /*#define NO_ARG_ARRAY */ | |
38 | ||
39 | /* Define WORD_MACHINE if addresses and such have | |
40 | * to be corrected before they can be used as byte counts. */ | |
41 | ||
42 | /*#define WORD_MACHINE */ | |
43 | ||
20c428fd JB |
44 | /* Now define a symbol for the cpu type, if your compiler |
45 | does not define it automatically: | |
46 | vax, m68000, ns16000, pyramid, orion, tahoe and APOLLO | |
47 | are the ones defined so far. */ | |
48 | ||
49 | #ifndef elxsi | |
50 | #define elxsi | |
51 | #endif | |
52 | ||
53 | /* Use type int rather than a union, to represent Lisp_Object */ | |
54 | /* This is desirable for most machines. */ | |
55 | ||
56 | #define NO_UNION_TYPE | |
57 | ||
58 | /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend | |
59 | the 24-bit bit field into an int. In other words, if bit fields | |
60 | are always unsigned. | |
61 | ||
62 | If you use NO_UNION_TYPE, this flag does not matter. */ | |
63 | ||
64 | #define EXPLICIT_SIGN_EXTEND | |
65 | ||
66 | ||
67 | /* Name of kernel load average variable */ | |
68 | ||
69 | #undef LDAV_SYMBOL | |
70 | #define LDAV_SYMBOL "avenrun" | |
71 | ||
72 | /* Data type of load average, as read out of kmem. */ | |
73 | ||
74 | #define LOAD_AVE_TYPE double | |
75 | ||
76 | /* Convert that into an integer that is 100 for a load average of 1.0 */ | |
77 | ||
78 | #define LOAD_AVE_CVT(x) (int) ((x) * 100.0) | |
79 | ||
80 | /* Define CANNOT_DUMP on machines where unexec does not work. | |
81 | Then the function dump-emacs will not be defined | |
82 | and temacs will do (load "loadup") automatically unless told otherwise. | |
83 | ||
b9706ae4 JB |
84 | Earlier versions couldn't dump. |
85 | Changes for 12.0 release are in 19.1. | |
86 | Dumping should work now. */ | |
20c428fd JB |
87 | |
88 | /* #define CANNOT_DUMP */ | |
89 | ||
90 | /* Define VIRT_ADDR_VARIES if the virtual addresses of | |
91 | pure and impure space as loaded can vary, and even their | |
92 | relative order cannot be relied on. | |
93 | ||
94 | Otherwise Emacs assumes that text space precedes data space, | |
95 | numerically. */ | |
96 | ||
97 | /* #define VIRT_ADDR_VARIES */ | |
98 | ||
99 | /* Define C_ALLOCA if this machine does not support a true alloca | |
100 | and the one written in C should be used instead. | |
101 | Define HAVE_ALLOCA to say that the system provides a properly | |
102 | working alloca function and it should be used. | |
103 | Define neither one if an assembler-language alloca | |
104 | in the file alloca.s should be used. */ | |
105 | ||
106 | #define C_ALLOCA | |
107 | /*#define HAVE_ALLOCA */ | |
108 | ||
109 | /* Define NO_REMAP if memory segmentation makes it not work well | |
110 | to change the boundary between the text section and data section | |
111 | when Emacs is dumped. If you define this, the preloaded Lisp | |
112 | code will not be sharable; but that's better than failing completely. */ | |
113 | /*#define NO_REMAP*/ | |
114 | ||
115 | /* This is a guess for an alternate solution to whatever | |
116 | problem motivated defining _sobuf in sysdep,c with extern char *_sobuf. */ | |
117 | #define _sobuf xsobuf | |
118 | ||
119 | /* Address of start of text segment as loaded. */ | |
120 | ||
121 | #define TEXT_START 0x800 | |
122 | ||
123 | /* Tell crt0.c not to define environ. */ | |
124 | ||
125 | #define DONT_NEED_ENVIRON | |
126 | ||
127 | /* The elxsi has no debugger, so might as well optimize instead | |
128 | of trying to make a symbol table. */ | |
129 | ||
130 | #define C_DEBUG_SWITCH -O | |
131 | ||
132 | /* Elxsi uses COFF under both Sys V and BSD environments */ | |
133 | ||
134 | #define COFF | |
135 | ||
136 | #define ADJUST_EXEC_HEADER {\ | |
137 | extern int _init_brk;\ | |
138 | _init_brk = bss_start;\ | |
139 | } |