src/m/aviion.h

   1 /* machine description file for Data General AViiON.
   2    Copyright (C) 1985, 1986, 1991 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 2, 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, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21
  22 /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
  23    is the most significant byte.  */
  24
  25 #define WORDS_BIG_ENDIAN
  26
  27 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  28  * group of arguments and treat it as an array of the arguments.  */
  29
  30 #define NO_ARG_ARRAY
  31
  32 /* Define WORD_MACHINE if addresses and such have
  33  * to be corrected before they can be used as byte counts.  */
  34
  35 #define WORD_MACHINE
  36
  37 /* Define DATA_SEG_BITS if pointers need to be corrected with
  38    a segment field.  */
  39
  40 #ifdef FIX_ADDRESS
  41 #define DATA_SEG_BITS 0xef000000
  42 #endif
  43
  44 /* Now define a symbol for the cpu type, if your compiler
  45    does not define it automatically:
  46    Ones defined so far include vax, m68000, ns16000, pyramid,
  47    orion, tahoe, APOLLO and many others */
  48
  49 #ifndef m88k
  50 #define m88k
  51 #endif
  52
  53 /* Use type int rather than a union, to represent Lisp_Object */
  54 /* This is desirable for most machines.  */
  55
  56 #define NO_UNION_TYPE
  57
  58 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
  59    the bit field into an int.  In other words, if bit fields
  60    are always unsigned.
  61
  62    If you use NO_UNION_TYPE, this flag does not matter.  */
  63
  64 #define EXPLICIT_SIGN_EXTEND
  65
  66 /* Data type of load average, as read out of kmem.  */
  67
  68 /* #define LOAD_AVE_TYPE long */
  69
  70 /* Convert that into an integer that is 100 for a load average of 1.0  */
  71
  72 /* #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE) */
  73
  74 /* Define CANNOT_DUMP on machines where unexec does not work.
  75    Then the function dump-emacs will not be defined
  76    and temacs will do (load "loadup") automatically unless told otherwise.  */
  77
  78 /* #define CANNOT_DUMP */
  79
  80 /* Define VIRT_ADDR_VARIES if the virtual addresses of
  81    pure and impure space as loaded can vary, and even their
  82    relative order cannot be relied on.
  83
  84    Otherwise Emacs assumes that text space precedes data space,
  85    numerically.  */
  86
  87 /* #define VIRT_ADDR_VARIES */
  88
  89 /* Define C_ALLOCA if this machine does not support a true alloca
  90    and the one written in C should be used instead.
  91    Define HAVE_ALLOCA to say that the system provides a properly
  92    working alloca function and it should be used.
  93    Define neither one if an assembler-language alloca
  94    in the file alloca.s should be used.  */
  95
  96 /* #define C_ALLOCA */
  97 #define HAVE_ALLOCA
  98 #define alloca(x) __builtin_alloca(x)
  99
 100 /* Define NO_REMAP if memory segmentation makes it not work well
 101    to change the boundary between the text section and data section
 102    when Emacs is dumped.  If you define this, the preloaded Lisp
 103    code will not be sharable; but that's better than failing completely.  */
 104
 105 #define NO_REMAP
 106
 107 /* Define ADDR_CORRECT(ADDR) to be a macro to correct an int which is
 108    the bit pattern of a pointer to a byte into an int which is the
 109    number of a byte.
 110
 111    This macro has a default definition which is usually right.
 112    This default definition is a no-op on most machines (where a
 113    pointer looks like an int) but not on all machines. */
 114
 115 #define ADDR_CORRECT(ADDR) ((int)ADDR)
 116
 117 /* Cast pointers to this type to compare them. */
 118
 119 #define PNTR_COMPARISON_TYPE    void *
 120
 121 /* Some machines that use COFF executables require that each section
 122    start on a certain boundary *in the COFF file*.  Such machines should
 123    define SECTION_ALIGNMENT to a mask of the low-order bits that must be
 124    zero on such a boundary.  This mask is used to control padding between
 125    segments in the COFF file.
 126
 127    If SECTION_ALIGNMENT is not defined, the segments are written
 128    consecutively with no attempt at alignment.  This is right for
 129    unmodified system V.  */
 130
 131 #define SECTION_ALIGNMENT 0x7
 132