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428
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1 /* Machine description file for intel 386.
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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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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 Intel 386 (-machine=intel386 or -machine=is386.h)
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29
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30 The possibilities for -opsystem are: bsd4-2, usg5-2-2, usg5-3,
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31 isc2-2, 386-ix, esix, linux, sco3.2v4, and xenix.
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32
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33 18.58 should support a wide variety of operating systems.
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34 Use isc2-2 for Interactive 386/ix version 2.2.
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35 Use 386ix for prior versions.
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36 Use esix for Esix.
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37 Use linux for Linux.
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38 It isn't clear what to do on an SCO system.
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39
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40 -machine=is386 is used for an Integrated Solutions 386 machine.
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41 It may also be correct for Microport systems.
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42
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43 Cubix QBx/386 (-machine=intel386 -opsystem=usg5-3)
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44
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45 Changes merged in 19.1. Systems before 2/A/0 may fail to compile etags.c
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46 due to a compiler bug.
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47
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48 Prime EXL (-machine=intel386 -opsystem=usg5-3)
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49
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50 Minor changes merged in 19.1.
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51 NOTE-END */
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52
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53 /* Define WORD_MACHINE if addresses and such have
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54 * to be corrected before they can be used as byte counts. */
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55
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56 /* #define WORD_MACHINE */
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57
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58 /* Now define a symbol for the cpu type, if your compiler
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59 does not define it automatically:
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60 Ones defined so far include vax, m68000, ns16000, pyramid,
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61 orion, tahoe, APOLLO and many others */
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62
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63 #define INTEL386
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64
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65 /* crt0.c, if it is used, should use the i386-bsd style of entry.
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66 with no extra dummy args. On USG and XENIX,
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67 NO_REMAP says this isn't used. */
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68
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69 /* Mly 16-Jan-96 16:38:32: this is part of a prototype -- same bug present in
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70 other m*.h files */
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71 #define CRT0_DUMMIES int bogus_fp,
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72
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73 /* crt0.c should define a symbol `start' and do .globl with a dot. */
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74
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75 #define DOT_GLOBAL_START
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76
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77 #ifdef XENIX
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78 /* Data type of load average, as read out of kmem. */
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79 #define LOAD_AVE_TYPE short
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80
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81 /* Convert that into an integer that is 100 for a load average of 1.0 */
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82 #define LOAD_AVE_CVT(x) (((double) (x)) * 100.0 / FSCALE)
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83
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84 #define FSCALE 256.0 /* determined by experimentation... */
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85 #endif
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86
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87
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88 #ifdef SOLARIS2
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89 /* Data type of load average, as read out of kmem. */
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90 #define LOAD_AVE_TYPE long
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91
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92 /* Convert that into an integer that is 100 for a load average of 1.0 */
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93 /* This is totally uncalibrated. */
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94 #define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
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95
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96 /* configure thinks solaris X86 has gethostname, but it does not work,
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97 so undefine it. */
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98 #undef HAVE_GETHOSTNAME
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99
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100 #else /* not SOLARIS2 */
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101 #ifdef USG5_4 /* Older USG systems do not support the load average. */
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102 /* Data type of load average, as read out of kmem. */
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103
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104 #define LOAD_AVE_TYPE long
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105
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106 /* Convert that into an integer that is 100 for a load average of 1.0 */
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107 /* This is totally uncalibrated. */
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108
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109 #define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
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110 #define FSCALE 256.0
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111 #endif
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112 #endif /* not SOLARIS2 */
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113
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114 /* Define CANNOT_DUMP on machines where unexec does not work.
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115 Then the function dump-emacs will not be defined
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116 and temacs will do (load "loadup") automatically unless told otherwise. */
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117
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118 /* #define CANNOT_DUMP */
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119
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120 /* Define VIRT_ADDR_VARIES if the virtual addresses of
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121 pure and impure space as loaded can vary, and even their
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122 relative order cannot be relied on.
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123
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124 Otherwise Emacs assumes that text space precedes data space,
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125 numerically. */
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126
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127 /* #define VIRT_ADDR_VARIES */
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128
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129 #ifdef XENIX
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130
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131 /* Define NO_REMAP if memory segmentation makes it not work well
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132 to change the boundary between the text section and data section
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133 when Emacs is dumped. If you define this, the preloaded Lisp
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134 code will not be sharable; but that's better than failing completely. */
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135
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136 #define NO_REMAP
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137
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138 #define STACK_DIRECTION -1
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139
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140 /* Since cannot purify, use standard Xenix 386 startup code. */
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141
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142 #define START_FILES "/lib/386/Sseg.o pre-crt0.o /lib/386/Scrt0.o"
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143
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144 /* These really use terminfo. */
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145
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146 #define LIBS_TERMCAP "/lib/386/Slibcurses.a /lib/386/Slibtinfo.a /lib/386/Slibx.a"
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147
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148 /* Standard libraries for this machine. Since `-l' doesn't work in `ld'. */
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149 /* '__fltused' is unresolved w/o Slibcfp.a */
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150 #define LIB_STANDARD "/lib/386/Slibcfp.a /lib/386/Slibc.a"
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151 #else /* not XENIX */
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152
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153 #ifdef USG
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154
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155 #if 0 /* ALLOCA is now autodetected */
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156 #define HAVE_ALLOCA
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157 #endif
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158 #define NO_REMAP
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159 #define TEXT_START 0
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160 #endif /* USG */
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161 #endif /* not XENIX */
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162
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163 #ifdef USG5_4
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164 #define DATA_SEG_BITS 0x08000000
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165 #endif
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166
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167 #ifdef MSDOS
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168 #define NO_REMAP
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169 #endif
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170
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171 #ifdef linux
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172 /* libc-linux/sysdeps/linux/i386/ulimit.c says that due to shared library, */
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173 /* we cannot get the maximum address for brk */
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174 #define ULIMIT_BREAK_VALUE (32*1024*1024)
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175
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176 #define SEGMENT_MASK ((SEGMENT_SIZE)-1)
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177 #endif
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178
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179 #ifdef __GNUC__
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180 /* GCC's alloca() is semi-broken. See lisp.h.
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181
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182 This brokenness has been confirmed under both Linux and NetBSD.
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183 It may also exist on non-Intel architectures. */
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184 #define BROKEN_ALLOCA_IN_FUNCTION_CALLS
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185 #endif
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186
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187 /* XEmacs change: John Hughes <john@AtlanTech.COM> says using vfork
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188 under i386-unknown-sysv4.2 makes C-g sometimes cause a SIGSEGV
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189 in TTY mode; the problem goes away if you use fork */
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190 #ifdef USG5_4_2
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191 #define vfork fork
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192 #endif
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