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1 /* Machine description file for generic Motorola 68k.
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2 Copyright (C) 1985, 1995 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 symbol gives information on
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24 the size of various data types. */
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25
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26 /* Define WORD_MACHINE if addresses and such have
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27 * to be corrected before they can be used as byte counts. */
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28
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29 /* #define WORD_MACHINE */
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30
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31 /* Now define a symbol for the cpu type, if your compiler
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32 does not define it automatically. */
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33
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34 #ifndef m68k
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35 #define m68k
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36 #endif
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37
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38 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
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39 the 24-bit bit field into an int. In other words, if bit fields
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40 are always unsigned.
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41
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42 If you use NO_UNION_TYPE, this flag does not matter. */
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43
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44 #define EXPLICIT_SIGN_EXTEND
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45
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46 /* Define CANNOT_DUMP on machines where unexec does not work.
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47 Then the function dump-emacs will not be defined
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48 and temacs will do (load "loadup") automatically unless told otherwise. */
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49
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50 /* #define CANNOT_DUMP */
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51
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52 /* Define VIRT_ADDR_VARIES if the virtual addresses of
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53 pure and impure space as loaded can vary, and even their
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54 relative order cannot be relied on.
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55
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56 Otherwise Emacs assumes that text space precedes data space,
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57 numerically. */
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58
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59 /* #define VIRT_ADDR_VARIES */
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60
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61 #ifdef linux
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62 #ifdef __ELF__
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63 #define DATA_SEG_BITS 0x80000000
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64 #endif
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65
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66 #define NO_REMAP
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67 #define TEXT_START 0
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68 #endif
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69
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70 /* If compiling with GCC, let GCC implement alloca. */
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71 #if defined(__GNUC__) && !defined(alloca)
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72 #define alloca(n) __builtin_alloca(n)
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73 #define HAVE_ALLOCA
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74 #endif
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75 #define ASSERT_VALID_POINTER(pnt) (assert ((((int) pnt) & 1) == 0))
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