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428
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1 /* machine description file for ISI 68000's
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2 Copyright (C) 1985, 1986 Free Software Foundation, Inc.
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3
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4 This file is part of GNU Emacs.
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5
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6 GNU Emacs is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 2, or (at your option)
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9 any later version.
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10
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11 GNU Emacs is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs; see the file COPYING. If not, write to
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* Synched up with: FSF 19.31. */
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22
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23 /* The following line tells the configuration script what sort of
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24 operating system this machine is likely to run.
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25 USUAL-OPSYS="note"
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26
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27 NOTE-START
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28 Use `-opsystem=bsd4-2' or `-opsystem=bsd4-3'.
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29 NOTE-END */
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30
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31 #define ISI68K
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32
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33 /* Say this machine is a 68000 */
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34
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35 #define m68000
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36
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37 /* XINT must explicitly sign-extend */
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38
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39 #define EXPLICIT_SIGN_EXTEND
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40
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41 /* Data type of load average, as read out of kmem. */
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42
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43 #ifdef BSD4_3
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44 #define LOAD_AVE_TYPE long
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45 #else
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46 #define LOAD_AVE_TYPE double
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47 #endif BSD4_3
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48
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49 /* Convert that into an integer that is 100 for a load average of 1.0 */
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50
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51 #ifdef BSD4_3
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52 #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
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53 #else
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54 #define LOAD_AVE_CVT(x) ((int) ((x) * 100.0))
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55 #endif
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56
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57 /* Mask for address bits within a memory segment */
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58
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59 #define SEGMENT_MASK 0x1ffff
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60
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61 /* use the -20 switch to get the 68020 code */
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62 /* #define C_SWITCH_MACHINE -20 */
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63
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64 /* Use the version of the library for the 68020
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65 because the standard library requires some special hacks in crt0
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66 which the GNU crt0 does not have. */
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67
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68 #define LIB_STANDARD "-lmc"
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69
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70 /* macros to make unexec work right */
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71
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72 #define A_TEXT_OFFSET(HDR) sizeof(HDR)
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73 #define A_TEXT_SEEK(HDR) sizeof(HDR)
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74
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75 /* A few changes for the newer systems. */
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76
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77 #ifdef BSD4_3
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78 #define HAVE_ALLOCA
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79 /* The following line affects crt0.c. */
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80 #undef m68k
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81
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82 #undef LIB_STANDARD
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83 #define LIB_STANDARD "-lmc -lc"
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84 #define C_DEBUG_SWITCH "-20 -O -X23"
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85 #endif
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