1 /* machine description file for ISI 68000's
2 Copyright (C) 1985, 1986 Free Software Foundation, Inc.
4 This file is part of GNU Emacs.
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 1, or (at your option)
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.
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. */
21 /* The following line tells the configuration script what sort of
22 operating system this machine is likely to run.
26 Use `-opsystem=bsd4-2' or `-opsystem=bsd4-3'.
31 /* The following three symbols give information on
32 the size of various data types. */
34 #define SHORTBITS 16 /* Number of bits in a short */
36 #define INTBITS 32 /* Number of bits in an int */
38 #define LONGBITS 32 /* Number of bits in a long */
40 /* 68000 has lowest-numbered byte as most significant */
44 /* Say this machine is a 68000 */
48 /* Use type int rather than a union, to represent Lisp_Object */
52 /* XINT must explicitly sign-extend */
54 #define EXPLICIT_SIGN_EXTEND
56 /* Data type of load average, as read out of kmem. */
59 #define LOAD_AVE_TYPE long
61 #define LOAD_AVE_TYPE double
64 /* Convert that into an integer that is 100 for a load average of 1.0 */
67 #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
69 #define LOAD_AVE_CVT(x) ((int) ((x) * 100.0))
72 /* Mask for address bits within a memory segment */
74 #define SEGMENT_MASK 0x1ffff
76 /* use the -20 switch to get the 68020 code */
77 /* #define C_SWITCH_MACHINE -20 */
79 /* Use the version of the library for the 68020
80 because the standard library requires some special hacks in crt0
81 which the GNU crt0 does not have. */
83 #define LIB_STANDARD -lmc
85 /* macros to make unexec work right */
87 #define A_TEXT_OFFSET(HDR) sizeof(HDR)
88 #define A_TEXT_SEEK(HDR) sizeof(HDR)
90 /* A few changes for the newer systems. */
94 /* The following line affects crt0.c. */
98 #define LIB_STANDARD -lmc -lc
99 #define C_DEBUG_SWITCH -20 -O -X23