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1 /* Machine description file for Acorn RISCiX machines.
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2 Copyright (C) 1994 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 /* 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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28 /* Define how to take a char and sign-extend into an int.
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29 On machines where char is signed, this is a no-op. */
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30
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31 /* ARM note - The RISCiX Norcroft C Compiler has ALL
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32 non-32-bit types as unsigned */
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33
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34 #define SIGN_EXTEND_CHAR(c) (((int)(c) << 24) >> 24)
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35
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36 /* Now define a symbol for the cpu type, if your compiler
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37 does not define it automatically:
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38 Ones defined so far include vax, m68000, ns16000, pyramid,
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39 orion, tahoe, APOLLO and many others */
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40
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41 /* ARM note - this is done by the Norcroft compiler - symbol is `__arm' */
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42
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43 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
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44 the bit field into an int. In other words, if bit fields
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45 are always unsigned.
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46
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47 If you use NO_UNION_TYPE, this flag does not matter. */
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48
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49 #define EXPLICIT_SIGN_EXTEND
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50
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51 #ifdef LDAV_SYMBOL
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52 #undef LDAV_SYMBOL
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53 #endif
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54
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55 #define LDAV_SYMBOL "_iavenrun"
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56
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57
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58 /* Data type of load average, as read out of kmem. */
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59
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60 #define LOAD_AVE_TYPE long
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61
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62 /* Convert that into an integer that is 100 for a load average of 1.0 */
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63
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64 /*
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65 * Scale factor for scaled integers used to count
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66 * %cpu time and load averages.
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67 */
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68
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69 /* FSHIFT and FSCALE are defined in param.h, but are required by
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70 LOAD_AVE_CVT, so they need to be defined here. */
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71
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72 #ifndef FSHIFT
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73 #define FSHIFT 8 /* bits to right of fixed binary point */
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74 #endif
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75
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76 #ifndef FSCALE
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77 #define FSCALE (1<<FSHIFT)
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78 #endif
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79
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80 #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
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81
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82 /* Define CANNOT_DUMP on machines where unexec does not work.
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83 Then the function dump-emacs will not be defined
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84 and temacs will do (load "loadup") automatically unless told otherwise. */
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85
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86 #undef CANNOT_DUMP
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87
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88 /* Define VIRT_ADDR_VARIES if the virtual addresses of
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89 pure and impure space as loaded can vary, and even their
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90 relative order cannot be relied on.
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91
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92 Otherwise Emacs assumes that text space precedes data space,
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93 numerically. */
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94
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95 #undef VIRT_ADDR_VARIES
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96
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97 /* This prevents Emacs dumping an unsqueezed binary with the
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98 SQUEEZE bit set in the magic number. */
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99
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100 #define ADJUST_EXEC_HEADER {hdr.a_magic &= ~MF_SQUEEZED;}
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101
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102 /* Define C_ALLOCA if this machine does not support a true alloca
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103 and the one written in C should be used instead.
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104 Define HAVE_ALLOCA to say that the system provides a properly
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105 working alloca function and it should be used.
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106 Define neither one if an assembler-language alloca
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107 in the file alloca.s should be used. */
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108
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109 #ifdef __GNUC__
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110
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111 /* Use builtin alloca. Also be sure that no other ones are tried out. */
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112 #define alloca __builtin_alloca
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113 #define HAVE_ALLOCA
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114
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115 /* Keep gcc/RISCiX happy - it uses __gccmain where other versions of
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116 gcc use __main, because of a library routine name clash. */
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117 #define __main __gccmain
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118
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119 #else
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120 #define C_ALLOCA
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121 #undef HAVE_ALLOCA
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122 #endif /* __GNUC__ */
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123
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124 /* Define NO_REMAP if memory segmentation makes it not work well
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125 to change the boundary between the text section and data section
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126 when Emacs is dumped. If you define this, the preloaded Lisp
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127 code will not be sharable; but that's better than failing completely. */
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128
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129 #define NO_REMAP
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130
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131
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132 #ifndef NOT_C_CODE
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133 #define TEXT_START 0x8000
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134 #define DATA_END &_edata
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135 extern int _edata;
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136 #define etext _etext
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137 #endif
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138
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139 /* Avoid debugging library */
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140 #define LIBS_DEBUG
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141
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142 /* Avoid sharing libc */
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143 #define LIB_STANDARD -lc_n
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144
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145 /* Avoid sharing libX11 */
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146 #define LIB_X11_LIB -lX11_n
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147
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148 /* All kinds of symbol definitions, so as to avoid multiply defined symbol
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149 errors from the RISCiX linker. */
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150
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151 #ifdef __GNUC__
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152 #define C_DEBUG_SWITCH
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153
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154 #define C_OPTIMIZE_SWITCH -O1 -fomit-frame-pointer -w -g -Dgetopt=gnu_getopt -Dopterr=gnu_opterr -Doptind=gnu_optind -Doptarg=gnu_optarg -Dcfree=gnu_cfree -D___type=
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155
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156 #else
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157 #define C_DEBUG_SWITCH -O -w -g -Dgetopt=gnu_getopt -Dopterr=gnu_opterr -Doptind=gnu_optind -Doptarg=gnu_optarg -Dcfree=gnu_cfree
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158 #endif
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159
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160 /* Turn this on to avoid the emacs malloc and use standard one */
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161
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162 #undef SYSTEM_MALLOC
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163
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164 /* For the portable alloca */
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165 #define STACK_DIRECTION -1
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166
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167 #ifdef NO_REMAP
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168 /* CRT0_O is defined in s/riscix1-1.h or s/riscix1-2.h, as appropriate. */
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169 #define START_FILES pre-crt0.o CRT0_O
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170 #else
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171 Cannot
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172 do
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173 this
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174 yet
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175 #endif
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