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321
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1 /* Machine description file for digital/intel arm/strongarm
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2 Copyright (C) 1987 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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412
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23 /* Define WORD_MACHINE if addresses and such have
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24 * to be corrected before they can be used as byte counts. */
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25
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26 #undef WORD_MACHINE
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27
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321
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28 /* Now define a symbol for the cpu type, if your compiler
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29 does not define it automatically:
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30 Ones defined so far include vax, m68000, ns16000, pyramid,
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31 orion, tahoe, APOLLO and many others */
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32
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33 #ifndef arm
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34 #define arm
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35 #endif
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36
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37 /* crt0.c, if it is used, should use the i386-bsd style of entry.
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38 with no extra dummy args. On USG and XENIX,
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39 NO_REMAP says this isn't used. */
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40
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41 /* Mly 16-Jan-96 16:38:32: this is part of a prototype -- same bug present in
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42 other m*.h files */
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43 #define CRT0_DUMMIES int bogus_fp,
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44
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45 /* crt0.c should define a symbol `start' and do .globl with a dot. */
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46
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47 #define DOT_GLOBAL_START
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48
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49 #ifdef USG5_4 /* Older USG systems do not support the load average. */
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50 /* Data type of load average, as read out of kmem. */
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51
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52 #define LOAD_AVE_TYPE long
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53
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54 /* Convert that into an integer that is 100 for a load average of 1.0 */
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55 /* This is totally uncalibrated. */
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56
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57
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58 /* FSHIFT and FSCALE are defined in param.h, but are required by
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59 LOAD_AVE_CVT, so they need to be defined here. */
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60
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61 #ifndef FSHIFT
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62 #define FSHIFT 8 /* bits to right of fixed binary point */
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63 #endif
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64
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65 #ifndef FSCALE
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66 #define FSCALE (1<<FSHIFT)
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67 #endif
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68
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69 #define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
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70 #endif
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71
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72
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73 /* Define CANNOT_DUMP on machines where unexec does not work.
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74 Then the function dump-emacs will not be defined
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75 and temacs will do (load "loadup") automatically unless told otherwise. */
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76
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77 #undef CANNOT_DUMP
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78
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79 /* Define VIRT_ADDR_VARIES if the virtual addresses of
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80 pure and impure space as loaded can vary, and even their
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81 relative order cannot be relied on.
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82
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83 Otherwise Emacs assumes that text space precedes data space,
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84 numerically. */
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85
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86 #undef VIRT_ADDR_VARIES
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87
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88
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89 /* this brings in alloca() if we're using cc */
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90 #ifdef USG
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91 #define NO_REMAP
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92 #define TEXT_START 0
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93 #endif /* USG */
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94
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412
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95
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96 #ifdef USG5_4
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97 #define DATA_SEG_BITS 0x08000000
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98 #endif
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99
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100 #ifdef MSDOS
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101 #define NO_REMAP
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102 #endif
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103
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104 #ifdef WINDOWSNT
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321
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105 #define VIRT_ADDR_VARIES
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106 #define DATA_END get_data_end ()
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107 #define DATA_START get_data_start ()
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108 #define HAVE_ALLOCA
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109 #endif
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110
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111 #ifdef linux
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112 /* libc-linux/sysdeps/linux/i386/ulimit.c says that due to shared library, */
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113 /* we cannot get the maximum address for brk */
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114 #define ULIMIT_BREAK_VALUE (32*1024*1024)
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115
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116 #define SEGMENT_MASK ((SEGMENT_SIZE)-1)
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117 #endif
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118
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412
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119 #if 0
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120 #ifdef __GNUC__
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121 /* GCC's alloca() is semi-broken. See lisp.h.
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122
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123 This brokenness has been confirmed under both Linux and NetBSD.
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124 It may also exist on non-Intel architectures. */
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125 #define BROKEN_ALLOCA_IN_FUNCTION_CALLS
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126 #endif
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127 #endif
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128
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129
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321
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130 /* XEmacs change: John Hughes <john@AtlanTech.COM> says using vfork
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131 under i386-unknown-sysv4.2 makes C-g sometimes cause a SIGSEGV
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132 in TTY mode; the problem goes away if you use fork */
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133 #ifdef USG5_4_2
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134 #define vfork fork
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135 #endif
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