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

   1 /* machine description file for vax.
   2    Copyright (C) 1985, 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="note"
  24
  25 NOTE-START
  26 The vax (-machine=vax) runs zillions of different operating systems.
  27
  28 Vax running Berkeley Unix (-opsystem=bsd4-1, -opsystem=bsd4-2 or
  29                            -opsystem=bsd4-3)
  30
  31   Works.
  32
  33 Vax running Ultrix (-opsystem=bsd4-2)
  34
  35   Works.  See under Ultrix in share-lib/MACHINES for problems using X
  36   windows on Ultrix.
  37
  38 Vax running System V rel 2 (-opsystem=usg5-2)
  39
  40   18.27 Works.
  41
  42 Vax running System V rel 0 (-opsystem=usg5-0)
  43
  44   Works as of 18.36.
  45
  46 Vax running VMS (-opsystem=vms)
  47
  48   18.36 believed to work.  Addition of features is necessary to make
  49   this Emacs version more usable.
  50
  51 NOTE-END  */
  52
  53 /* The following three symbols give information on
  54  the size of various data types.  */
  55
  56 #define SHORTBITS 16            /* Number of bits in a short */
  57
  58 #define INTBITS 32              /* Number of bits in an int */
  59
  60 #define LONGBITS 32             /* Number of bits in a long */
  61
  62 /* Vax is not big-endian: lowest numbered byte is least significant. */
  63
  64 /* #undef BIG_ENDIAN */
  65
  66 /* #define vax    -- appears to be done automatically  */
  67
  68 /* Use type int rather than a union, to represent Lisp_Object */
  69
  70 #define NO_UNION_TYPE
  71
  72 /* crt0.c should use the vax-bsd style of entry, with no dummy args.  */
  73
  74 #define CRT0_DUMMIES
  75
  76 /* crt0.c should define a symbol `start' and do .globl with a dot.  */
  77
  78 #define DOT_GLOBAL_START
  79
  80 #ifdef BSD
  81 /* USG systems I know of running on Vaxes do not actually
  82    support the load average, so disable it for them.  */
  83
  84 /* Data type of load average, as read out of kmem.  */
  85
  86 #define LOAD_AVE_TYPE double
  87
  88 /* Convert that into an integer that is 100 for a load average of 1.0  */
  89
  90 #define LOAD_AVE_CVT(x) ((int) ((x) * 100.0))
  91
  92 #endif /* BSD */
  93
  94 #ifdef VMS
  95
  96 /* Data type of load average, as read out of driver.  */
  97
  98 #define LOAD_AVE_TYPE float
  99
 100 /* Convert that into an integer that is 100 for a load average of 1.0  */
 101
 102 #define LOAD_AVE_CVT(x) ((int) ((x) * 100.0))
 103
 104 #endif /* VMS */
 105
 106 /* Vax sysV has alloca in the PW library.  */
 107
 108 #ifdef USG
 109 #define LIB_STANDARD -lPW -lc
 110 #define HAVE_ALLOCA
 111
 112 /* There is some bug in unexec in for usg 5.2 on a vax
 113    which nobody who runs such a system has yet tracked down. */
 114 #ifndef USG5_0
 115 #define NO_REMAP
 116 #endif /* USG 5_0 */
 117
 118 #define TEXT_START 0
 119 #endif /* USG */
 120
 121 #ifdef BSD
 122 #define HAVE_ALLOCA
 123 #endif /* BSD */
 124
 125 #ifdef VMS
 126 #define C_ALLOCA
 127 #endif