code.delx.au - gnu-emacs/blob - src/m/att3b.h

   1 /* Machine-dependent configuration for GNU Emacs for AT&T 3b machines.
   2    Copyright (C) 1986 Free Software Foundation, Inc.
   3
   4    Modified by David Robinson (daver@csvax.caltech.edu) 6/6/86
   5
   6 This file is part of GNU Emacs.
   7
   8 GNU Emacs is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2, or (at your option)
  11 any later version.
  12
  13 GNU Emacs is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GNU Emacs; see the file COPYING.  If not, write to
  20 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  21 Boston, MA 02111-1307, USA.  */
  22
  23
  24 /* The following line tells the configuration script what sort of
  25    operating system this machine is likely to run.
  26    USUAL-OPSYS="usg5-2-2"  */
  27
  28 /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
  29    is the most significant byte.  */
  30
  31 #define WORDS_BIG_ENDIAN
  32
  33 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  34  * group of arguments and treat it as an array of the arguments.  */
  35
  36 /* #define NO_ARG_ARRAY */
  37
  38 /* Define WORD_MACHINE if addresses and such have
  39  * to be corrected before they can be used as byte counts.  */
  40
  41 /* #define WORD_MACHINE */
  42
  43 /* Now define a symbol for the cpu type, if your compiler
  44    does not define it automatically */
  45 #define ATT3B
  46
  47 /* Use type int rather than a union, to represent Lisp_Object */
  48 /* This is desirable for most machines.  */
  49
  50 #define NO_UNION_TYPE
  51
  52 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
  53    the bit field into an int.  In other words, if bit fields
  54    are always unsigned.
  55
  56    If you use NO_UNION_TYPE, this flag does not matter.  */
  57
  58 #define EXPLICIT_SIGN_EXTEND
  59
  60 /* Data type of load average, as read out of kmem.  */
  61 /* #define LOAD_AVE_TYPE long */
  62
  63 /* Convert that into an integer that is 100 for a load average of 1.0  */
  64
  65 /* #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE) */
  66
  67 /* Define CANNOT_DUMP on machines where unexec does not work.
  68    Then the function dump-emacs will not be defined
  69    and temacs will do (load "loadup") automatically unless told otherwise.  */
  70 /* #define CANNOT_DUMP */
  71
  72 /* Define VIRT_ADDR_VARIES if the virtual addresses of
  73    pure and impure space as loaded can vary, and even their
  74    relative order cannot be relied on.
  75
  76    Otherwise Emacs assumes that text space precedes data space,
  77    numerically.  */
  78
  79 /* #define VIRT_ADDR_VARIES */  /* Karl Kleinpaste says this isn't needed.  */
  80
  81 /* Define C_ALLOCA if this machine does not support a true alloca
  82    and the one written in C should be used instead.
  83    Define HAVE_ALLOCA to say that the system provides a properly
  84    working alloca function and it should be used.
  85    Define neither one if an assembler-language alloca
  86    in the file alloca.s should be used.  */
  87
  88 /* SysV has alloca in the PW library */
  89
  90 #define LIB_STANDARD -lPW -lc
  91 #define HAVE_ALLOCA
  92
  93 /* Define NO_REMAP if memory segmentation makes it not work well
  94    to change the boundary between the text section and data section
  95    when Emacs is dumped.  If you define this, the preloaded Lisp
  96    code will not be sharable; but that's better than failing completely.  */
  97
  98 #define NO_REMAP
  99
 100 /* #define LD_SWITCH_MACHINE -N */
 101
 102 /* Use Terminfo, not Termcap.  */
 103
 104 #define TERMINFO
 105
 106 /* -O has been observed to make correct C code in Emacs not work.
 107    So don't try to use it.  */
 108
 109 #if u3b2 || u3b5 || u3b15
 110 #define C_OPTIMIZE_SWITCH
 111 #endif
 112
 113 /* Define our page size.  */
 114
 115 #define NBPC 2048
 116
 117 /* The usual definition of XINT, which involves shifting, does not
 118    sign-extend properly on this machine.  */
 119
 120 #define XINT(i) (((sign_extend_temp=(i)) & 0x00800000) \
 121                  ? (sign_extend_temp | 0xFF000000) \
 122                  : (sign_extend_temp & 0x00FFFFFF))
 123
 124 #ifdef emacs /* Don't do this when making xmakefile! */
 125 extern int sign_extend_temp;
 126 #endif
 127
 128 #if u3b2 || u3b5 || u3b15
 129
 130 /* On 3b2/5/15, data space has high order bit on. */
 131 #define VALBITS 27
 132 #define VALMASK (((1<<VALBITS) - 1) | (1 << 31))
 133 #define XTYPE(a) ((enum Lisp_Type) (((a) >> VALBITS) & GCTYPEMASK))
 134
 135 #endif /* 3b2, 3b5 or 3b15 */
 136
 137 #define TEXT_START 0
 138
 139
 140 /* For alloca.c (not actually used, since HAVE_ALLOCA) */
 141 #define STACK_DIRECTION 1
 142
 143 /* (short) negative-int doesn't sign-extend correctly */
 144 #define SHORT_CAST_BUG
 145
 146 /* 3B2s with WIN/3B have winsize defined in ptem.h */
 147 #if u3b2
 148 #define NEED_PTEM_H
 149 #endif /* u3b2 */
 150
 151 /* 3b2 does not have memmove, I'm told.  */
 152 /* It is safe to have no parens around the args in the safe_bcopy call,
 153    and parens would screw up the prototype decl for memmove.  */
 154 #define memmove(d, s, n) safe_bcopy (s, d, n)
 155
 156 /* This affects filemode.c.  */
 157 #define NO_MODE_T