code.delx.au - gnu-emacs/blob - src/m/plexus.h

   1 /* machine description file for the Plexus running System V.2.
   2    Copyright (C) 1986 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 1, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20
  21 /* The following line tells the configuration script what sort of
  22    operating system this machine is likely to run.
  23    USUAL-OPSYS="usg5-2"  */
  24
  25 /* The following three symbols give information on
  26  the size of various data types.  */
  27
  28 #define SHORTBITS 16            /* Number of bits in a short */
  29
  30 #define INTBITS 32              /* Number of bits in an int */
  31
  32 #define LONGBITS 32             /* Number of bits in a long */
  33
  34 /* Define BIG_ENDIAN iff lowest-numbered byte in a word
  35    is the most significant byte.  */
  36
  37 #define BIG_ENDIAN
  38
  39 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  40  * group of arguments and treat it as an array of the arguments.  */
  41
  42 #undef NO_ARG_ARRAY
  43
  44 /* Define WORD_MACHINE if addresses and such have
  45  * to be corrected before they can be used as byte counts.  */
  46
  47 #undef WORD_MACHINE
  48
  49 /* Define how to take a char and sign-extend into an int.
  50    On machines where char is signed, this is a no-op.  */
  51
  52 #define SIGN_EXTEND_CHAR(c) (c)
  53
  54 /* Now define a symbol for the cpu type, if your compiler
  55    does not define it automatically:
  56    vax, m68000, ns16000, pyramid, orion, tahoe and APOLLO
  57    are the ones defined so far.  */
  58 /* Plexus predefines m68 instead of m68000. */
  59 #define m68000 m68
  60
  61 /* Use type int rather than a union, to represent Lisp_Object */
  62 /* This is desirable for most machines.  */
  63
  64 #define NO_UNION_TYPE
  65
  66 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
  67    the 24-bit bit field into an int.  In other words, if bit fields
  68    are always unsigned.
  69
  70    If you use NO_UNION_TYPE, this flag does not matter.  */
  71
  72 #undef EXPLICIT_SIGN_EXTEND
  73
  74 /* Data type of load average, as read out of kmem.  */
  75
  76 #undef LOAD_AVE_TYPE
  77
  78 /* Convert that into an integer that is 100 for a load average of 1.0  */
  79
  80 #undef LOAD_AVE_CVT
  81
  82 /* Define CANNOT_DUMP on machines where unexec does not work.
  83    Then the function dump-emacs will not be defined
  84    and temacs will do (load "loadup") automatically unless told otherwise.  */
  85
  86 #undef CANNOT_DUMP
  87
  88 /* Define VIRT_ADDR_VARIES if the virtual addresses of
  89    pure and impure space as loaded can vary, and even their
  90    relative order cannot be relied on.
  91
  92    Otherwise Emacs assumes that text space precedes data space,
  93    numerically.  */
  94
  95 #undef VIRT_ADDR_VARIES
  96
  97 /* Define C_ALLOCA if this machine does not support a true alloca
  98    and the one written in C should be used instead.
  99    Define HAVE_ALLOCA to say that the system provides a properly
 100    working alloca function and it should be used.
 101    Define neither one if an assembler-language alloca
 102    in the file alloca.s should be used.  */
 103
 104 #undef C_ALLOCA
 105 #define HAVE_ALLOCA
 106
 107 /* Define NO_REMAP if memory segmentation makes it not work well
 108    to change the boundary between the text section and data section
 109    when Emacs is dumped.  If you define this, the preloaded Lisp
 110    code will not be sharable; but that's better than failing completely.  */
 111
 112 #undef NO_REMAP
 113
 114 /* Use the following on ld so we can use the gnu crt0
 115    The plexus ld looks for start                      */
 116 #define LD_SWITCH_MACHINE -e __start
 117
 118 /* Use the PW library, which contains alloca.  */
 119
 120 #define LIB_STANDARD -lPW -lc
 121
 122 /* crt0.c should use the vax-bsd style of entry, with no dummy args.  */
 123
 124 #define CRT0_DUMMIES zero1, zero2,
 125
 126 /* This triggers some stuff to avoid a compiler bug */
 127
 128 #define TAHOE_REGISTER_BUG