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, 2002 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 /* SysV has alloca in the PW library */
  82
  83 #define LIB_STANDARD -lPW -lc
  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 #define NO_REMAP
  91
  92 /* #define LD_SWITCH_MACHINE -N */
  93
  94 /* Use Terminfo, not Termcap.  */
  95
  96 #define TERMINFO
  97
  98 /* -O has been observed to make correct C code in Emacs not work.
  99    So don't try to use it.  */
 100
 101 #if u3b2 || u3b5 || u3b15
 102 #define C_OPTIMIZE_SWITCH
 103 #endif
 104
 105 /* Define our page size.  */
 106
 107 #define NBPC 2048
 108
 109 #if 0 /* If this is still needed, don't hard-code assumptions about
 110          the number of VALBITS, or other assumptions about the
 111          Lisp_Object representation.  Try to extend lisp.h instead, if
 112          necessary.  */
 113 /* The usual definition of XINT, which involves shifting, does not
 114    sign-extend properly on this machine.  */
 115
 116 #define XINT(i) (((sign_extend_temp=(i)) & 0x00800000) \
 117                  ? (sign_extend_temp | 0xFF000000) \
 118                  : (sign_extend_temp & 0x00FFFFFF))
 119 #endif
 120
 121 #ifdef emacs /* Don't do this when making xmakefile! */
 122 extern int sign_extend_temp;
 123 #endif
 124
 125 #if u3b2 || u3b5 || u3b15
 126 /* On 3b2/5/15, data space has high order bit on. */
 127 #define DATA_SEG_BITS 0x80000000
 128 #endif /* 3b2, 3b5 or 3b15 */
 129
 130 #define TEXT_START 0
 131
 132 /* (short) negative-int doesn't sign-extend correctly */
 133 #define SHORT_CAST_BUG
 134
 135 /* 3B2s with WIN/3B have winsize defined in ptem.h */
 136 #if u3b2
 137 #define NEED_PTEM_H
 138 #endif /* u3b2 */
 139
 140 /* 3b2 does not have memmove, I'm told.  */
 141 /* It is safe to have no parens around the args in the safe_bcopy call,
 142    and parens would screw up the prototype decl for memmove.  */
 143 #define memmove(d, s, n) safe_bcopy (s, d, n)
 144
 145 /* This affects filemode.c.  */
 146 #define NO_MODE_T