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20c428fd JB |
1 | /* machine description file for the Plexus running System V.2. |
2 | Copyright (C) 1986 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 | |
17385adc | 8 | the Free Software Foundation; either version 2, or (at your option) |
20c428fd JB |
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 GNU Emacs; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | ||
21 | /* The following line tells the configuration script what sort of | |
22 | operating system this machine is likely to run. | |
23 | USUAL-OPSYS="usg5-2" */ | |
24 | ||
25 | /* The following three symbols give information on | |
26 | the size of various data types. */ | |
27 | ||
28 | #define SHORTBITS 16 /* Number of bits in a short */ | |
29 | ||
30 | #define INTBITS 32 /* Number of bits in an int */ | |
31 | ||
32 | #define LONGBITS 32 /* Number of bits in a long */ | |
33 | ||
34 | /* Define BIG_ENDIAN iff lowest-numbered byte in a word | |
35 | is the most significant byte. */ | |
36 | ||
37 | #define BIG_ENDIAN | |
38 | ||
39 | /* Define NO_ARG_ARRAY if you cannot take the address of the first of a | |
40 | * group of arguments and treat it as an array of the arguments. */ | |
41 | ||
42 | #undef NO_ARG_ARRAY | |
43 | ||
44 | /* Define WORD_MACHINE if addresses and such have | |
45 | * to be corrected before they can be used as byte counts. */ | |
46 | ||
47 | #undef WORD_MACHINE | |
48 | ||
20c428fd JB |
49 | /* Now define a symbol for the cpu type, if your compiler |
50 | does not define it automatically: | |
51 | vax, m68000, ns16000, pyramid, orion, tahoe and APOLLO | |
52 | are the ones defined so far. */ | |
53 | /* Plexus predefines m68 instead of m68000. */ | |
54 | #define m68000 m68 | |
55 | ||
56 | /* Use type int rather than a union, to represent Lisp_Object */ | |
57 | /* This is desirable for most machines. */ | |
58 | ||
59 | #define NO_UNION_TYPE | |
60 | ||
61 | /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend | |
62 | the 24-bit bit field into an int. In other words, if bit fields | |
63 | are always unsigned. | |
64 | ||
65 | If you use NO_UNION_TYPE, this flag does not matter. */ | |
66 | ||
67 | #undef EXPLICIT_SIGN_EXTEND | |
68 | ||
69 | /* Data type of load average, as read out of kmem. */ | |
70 | ||
71 | #undef LOAD_AVE_TYPE | |
72 | ||
73 | /* Convert that into an integer that is 100 for a load average of 1.0 */ | |
74 | ||
75 | #undef LOAD_AVE_CVT | |
76 | ||
77 | /* Define CANNOT_DUMP on machines where unexec does not work. | |
78 | Then the function dump-emacs will not be defined | |
79 | and temacs will do (load "loadup") automatically unless told otherwise. */ | |
80 | ||
81 | #undef CANNOT_DUMP | |
82 | ||
83 | /* Define VIRT_ADDR_VARIES if the virtual addresses of | |
84 | pure and impure space as loaded can vary, and even their | |
85 | relative order cannot be relied on. | |
86 | ||
87 | Otherwise Emacs assumes that text space precedes data space, | |
88 | numerically. */ | |
89 | ||
90 | #undef VIRT_ADDR_VARIES | |
91 | ||
92 | /* Define C_ALLOCA if this machine does not support a true alloca | |
93 | and the one written in C should be used instead. | |
94 | Define HAVE_ALLOCA to say that the system provides a properly | |
95 | working alloca function and it should be used. | |
96 | Define neither one if an assembler-language alloca | |
97 | in the file alloca.s should be used. */ | |
98 | ||
99 | #undef C_ALLOCA | |
100 | #define HAVE_ALLOCA | |
101 | ||
102 | /* Define NO_REMAP if memory segmentation makes it not work well | |
103 | to change the boundary between the text section and data section | |
104 | when Emacs is dumped. If you define this, the preloaded Lisp | |
105 | code will not be sharable; but that's better than failing completely. */ | |
106 | ||
107 | #undef NO_REMAP | |
108 | ||
109 | /* Use the following on ld so we can use the gnu crt0 | |
110 | The plexus ld looks for start */ | |
111 | #define LD_SWITCH_MACHINE -e __start | |
112 | ||
113 | /* Use the PW library, which contains alloca. */ | |
114 | ||
115 | #define LIB_STANDARD -lPW -lc | |
116 | ||
117 | /* crt0.c should use the vax-bsd style of entry, with no dummy args. */ | |
118 | ||
119 | #define CRT0_DUMMIES zero1, zero2, | |
120 | ||
121 | /* This triggers some stuff to avoid a compiler bug */ | |
122 | ||
123 | #define TAHOE_REGISTER_BUG |