src/m/plexus.h

   1 /* machine description file for the Plexus running System V.2.
   2    Copyright (C) 1986, 2002, 2003, 2004, 2005,
   3                  2006 Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs; see the file COPYING.  If not, write to
  19 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20 Boston, MA 02110-1301, USA.  */
  21
  22
  23 /* The following line tells the configuration script what sort of
  24    operating system this machine is likely to run.
  25    USUAL-OPSYS="usg5-2"  */
  26
  27 /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
  28    is the most significant byte.  */
  29
  30 #define WORDS_BIG_ENDIAN
  31
  32 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  33  * group of arguments and treat it as an array of the arguments.  */
  34
  35 #undef NO_ARG_ARRAY
  36
  37 /* Define WORD_MACHINE if addresses and such have
  38  * to be corrected before they can be used as byte counts.  */
  39
  40 #undef WORD_MACHINE
  41
  42 /* Now define a symbol for the cpu type, if your compiler
  43    does not define it automatically:
  44    vax, m68000, ns16000, pyramid, orion, tahoe and APOLLO
  45    are the ones defined so far.  */
  46 /* Plexus predefines m68 instead of m68000. */
  47 #define m68000 m68
  48
  49 /* Use type int rather than a union, to represent Lisp_Object */
  50 /* This is desirable for most machines.  */
  51
  52 #define NO_UNION_TYPE
  53
  54 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
  55    the 24-bit bit field into an int.  In other words, if bit fields
  56    are always unsigned.
  57
  58    If you use NO_UNION_TYPE, this flag does not matter.  */
  59
  60 #undef EXPLICIT_SIGN_EXTEND
  61
  62 /* Data type of load average, as read out of kmem.  */
  63
  64 #undef LOAD_AVE_TYPE
  65
  66 /* Convert that into an integer that is 100 for a load average of 1.0  */
  67
  68 #undef LOAD_AVE_CVT
  69
  70 /* Define CANNOT_DUMP on machines where unexec does not work.
  71    Then the function dump-emacs will not be defined
  72    and temacs will do (load "loadup") automatically unless told otherwise.  */
  73
  74 #undef CANNOT_DUMP
  75
  76 /* Define VIRT_ADDR_VARIES if the virtual addresses of
  77    pure and impure space as loaded can vary, and even their
  78    relative order cannot be relied on.
  79
  80    Otherwise Emacs assumes that text space precedes data space,
  81    numerically.  */
  82
  83 #undef VIRT_ADDR_VARIES
  84
  85 /* Define NO_REMAP if memory segmentation makes it not work well
  86    to change the boundary between the text section and data section
  87    when Emacs is dumped.  If you define this, the preloaded Lisp
  88    code will not be sharable; but that's better than failing completely.  */
  89
  90 #undef NO_REMAP
  91
  92 /* Use the following on ld so we can use the gnu crt0
  93    The plexus ld looks for start                      */
  94 #define LD_SWITCH_MACHINE -e __start
  95
  96 /* Use the PW library, which contains alloca.  */
  97
  98 #define LIB_STANDARD -lPW -lc
  99
 100 /* crt0.c should use the vax-bsd style of entry, with no dummy args.  */
 101
 102 #define CRT0_DUMMIES zero1, zero2,
 103
 104 /* This triggers some stuff to avoid a compiler bug */
 105
 106 #define TAHOE_REGISTER_BUG
 107
 108 /* arch-tag: 78c607eb-b4f8-4750-b575-39670d979448
 109    (do not change this comment) */