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428
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1 /* machine description file for Elxsi machine (running enix).
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2 Copyright (C) 1986, 1992 Free Software Foundation, Inc.
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3 Adapted by John Salmon
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4
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5 This file is part of GNU Emacs.
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6
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7 GNU Emacs is free software; you can redistribute it and/or modify
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8 it under the terms of the GNU General Public License as published by
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9 the Free Software Foundation; either version 2, or (at your option)
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10 any later version.
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11
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12 GNU Emacs is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with XEmacs; see the file COPYING. If not, write to
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19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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20 Boston, MA 02111-1307, USA. */
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21
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22 /* Synched up with: FSF 19.31. */
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23
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24 /* The following line tells the configuration script what sort of
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25 operating system this machine is likely to run.
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26 USUAL-OPSYS="usg5-2" */
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27
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28 /* This file was modified by Matt Crawford <matt@tank.uchicago.edu>
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29 to work under Elxsi's 12.0 release of BSD unix. */
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30
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31 /* Define WORD_MACHINE if addresses and such have
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32 * to be corrected before they can be used as byte counts. */
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33
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34 /*#define WORD_MACHINE */
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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 vax, m68000, ns16000, pyramid, orion, tahoe and APOLLO
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39 are the ones defined so far. */
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40
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41 #ifndef elxsi
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42 #define elxsi
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43 #endif
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44
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45 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
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46 the bit field into an int. In other words, if bit fields
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47 are always unsigned.
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48
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49 If you use NO_UNION_TYPE, this flag does not matter. */
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50
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51 #define EXPLICIT_SIGN_EXTEND
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52
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53
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54 /* Name of kernel load average variable */
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55
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56 #undef LDAV_SYMBOL
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57 #define LDAV_SYMBOL "avenrun"
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58
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59 /* Data type of load average, as read out of kmem. */
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60
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61 #define LOAD_AVE_TYPE double
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62
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63 /* Convert that into an integer that is 100 for a load average of 1.0 */
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64
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65 #define LOAD_AVE_CVT(x) (int) ((x) * 100.0)
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66
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67 /* Define CANNOT_DUMP on machines where unexec does not work.
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68 Then the function dump-emacs will not be defined
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69 and temacs will do (load "loadup") automatically unless told otherwise.
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70
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71 Earlier versions couldn't dump.
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72 Changes for 12.0 release are in 19.1.
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73 Dumping should work now. */
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74
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75 /* #define CANNOT_DUMP */
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76
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77 /* Define VIRT_ADDR_VARIES if the virtual addresses of
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78 pure and impure space as loaded can vary, and even their
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79 relative order cannot be relied on.
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80
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81 Otherwise Emacs assumes that text space precedes data space,
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82 numerically. */
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83
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84 /* #define VIRT_ADDR_VARIES */
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85
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86 /* Define C_ALLOCA if this machine does not support a true alloca
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87 and the one written in C should be used instead.
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88 Define HAVE_ALLOCA to say that the system provides a properly
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89 working alloca function and it should be used.
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90 Define neither one if an assembler-language alloca
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91 in the file alloca.s should be used. */
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92
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93 #define C_ALLOCA
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94 /*#define HAVE_ALLOCA */
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95
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96 /* Define NO_REMAP if memory segmentation makes it not work well
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97 to change the boundary between the text section and data section
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98 when Emacs is dumped. If you define this, the preloaded Lisp
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99 code will not be sharable; but that's better than failing completely. */
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100 /*#define NO_REMAP*/
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101
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102 /* This is a guess for an alternate solution to whatever
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103 problem motivated defining _sobuf in sysdep,c with extern char *_sobuf. */
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104 #define _sobuf xsobuf
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105
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106 /* Address of start of text segment as loaded. */
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107
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108 #define TEXT_START 0x800
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109
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110 /* Tell crt0.c not to define environ. */
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111
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112 #define DONT_NEED_ENVIRON
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113
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114 /* The elxsi has no debugger, so might as well optimize instead
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115 of trying to make a symbol table. */
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116
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117 #define C_DEBUG_SWITCH "-O"
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118
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119 /* Elxsi uses COFF under both Sys V and BSD environments */
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120
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121 #define COFF
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122
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123 #define ADJUST_EXEC_HEADER {\
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124 extern int _init_brk;\
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125 _init_brk = bss_start;\
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126 }
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