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20c428fd JB |
1 | /* machine description file for ISI 68000's |
2 | Copyright (C) 1985, 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 | |
3b7ad313 EN |
18 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
19 | Boston, MA 02111-1307, USA. */ | |
20c428fd JB |
20 | |
21 | ||
22 | /* The following line tells the configuration script what sort of | |
23 | operating system this machine is likely to run. | |
24 | USUAL-OPSYS="note" | |
25 | ||
26 | NOTE-START | |
27 | Use `-opsystem=bsd4-2' or `-opsystem=bsd4-3'. | |
28 | NOTE-END */ | |
29 | ||
30 | #define ISI68K | |
31 | ||
74d3f806 KH |
32 | /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word |
33 | is the most significant byte. */ | |
34 | ||
35 | #define WORDS_BIG_ENDIAN | |
36 | ||
20c428fd JB |
37 | /* Say this machine is a 68000 */ |
38 | ||
39 | #define m68000 | |
40 | ||
41 | /* Use type int rather than a union, to represent Lisp_Object */ | |
42 | ||
43 | #define NO_UNION_TYPE | |
44 | ||
45 | /* XINT must explicitly sign-extend */ | |
46 | ||
47 | #define EXPLICIT_SIGN_EXTEND | |
48 | ||
49 | /* Data type of load average, as read out of kmem. */ | |
50 | ||
51 | #ifdef BSD4_3 | |
52 | #define LOAD_AVE_TYPE long | |
53 | #else | |
54 | #define LOAD_AVE_TYPE double | |
55 | #endif BSD4_3 | |
56 | ||
57 | /* Convert that into an integer that is 100 for a load average of 1.0 */ | |
58 | ||
59 | #ifdef BSD4_3 | |
60 | #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE) | |
61 | #else | |
62 | #define LOAD_AVE_CVT(x) ((int) ((x) * 100.0)) | |
63 | #endif | |
64 | ||
65 | /* Mask for address bits within a memory segment */ | |
66 | ||
67 | #define SEGMENT_MASK 0x1ffff | |
68 | ||
69 | /* use the -20 switch to get the 68020 code */ | |
70 | /* #define C_SWITCH_MACHINE -20 */ | |
71 | ||
72 | /* Use the version of the library for the 68020 | |
73 | because the standard library requires some special hacks in crt0 | |
74 | which the GNU crt0 does not have. */ | |
75 | ||
76 | #define LIB_STANDARD -lmc | |
77 | ||
78 | /* macros to make unexec work right */ | |
79 | ||
80 | #define A_TEXT_OFFSET(HDR) sizeof(HDR) | |
81 | #define A_TEXT_SEEK(HDR) sizeof(HDR) | |
82 | ||
83 | /* A few changes for the newer systems. */ | |
84 | ||
85 | #ifdef BSD4_3 | |
86 | #define HAVE_ALLOCA | |
87 | /* The following line affects crt0.c. */ | |
88 | #undef m68k | |
89 | ||
90 | #undef LIB_STANDARD | |
91 | #define LIB_STANDARD -lmc -lc | |
92 | #define C_DEBUG_SWITCH -20 -O -X23 | |
93 | #endif |