code.delx.au - gnu-emacs/blob - 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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20
  21 /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
  22    is the most significant byte.  */
  23
  24 #define WORDS_BIG_ENDIAN
  25
  26 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  27  * group of arguments and treat it as an array of the arguments.  */
  28
  29 #define NO_ARG_ARRAY
  30
  31 /* Define WORD_MACHINE if addresses and such have
  32  * to be corrected before they can be used as byte counts.  */
  33
  34 #define WORD_MACHINE
  35
  36 /* Define DATA_SEG_BITS if pointers need to be corrected with
  37    a segment field.  */
  38
  39 #ifdef FIX_ADDRESS
  40 #define DATA_SEG_BITS 0xef000000
  41 #endif
  42
  43 /* Now define a symbol for the cpu type, if your compiler
  44    does not define it automatically:
  45    Ones defined so far include vax, m68000, ns16000, pyramid,
  46    orion, tahoe, APOLLO and many others */
  47
  48 #ifndef m88k
  49 #define m88k
  50 #endif
  51
  52 /* Use type int rather than a union, to represent Lisp_Object */
  53 /* This is desirable for most machines.  */
  54
  55 #define NO_UNION_TYPE
  56
  57 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
  58    the bit field into an int.  In other words, if bit fields
  59    are always unsigned.
  60
  61    If you use NO_UNION_TYPE, this flag does not matter.  */
  62
  63 #define EXPLICIT_SIGN_EXTEND
  64
  65 /* Data type of load average, as read out of kmem.  */
  66
  67 /* #define LOAD_AVE_TYPE long */
  68
  69 /* Convert that into an integer that is 100 for a load average of 1.0  */
  70
  71 /* #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE) */
  72
  73 /* Define CANNOT_DUMP on machines where unexec does not work.
  74    Then the function dump-emacs will not be defined
  75    and temacs will do (load "loadup") automatically unless told otherwise.  */
  76
  77 /* #define CANNOT_DUMP */
  78
  79 /* Define VIRT_ADDR_VARIES if the virtual addresses of
  80    pure and impure space as loaded can vary, and even their
  81    relative order cannot be relied on.
  82
  83    Otherwise Emacs assumes that text space precedes data space,
  84    numerically.  */
  85
  86 /* #define VIRT_ADDR_VARIES */
  87
  88 /* Define C_ALLOCA if this machine does not support a true alloca
  89    and the one written in C should be used instead.
  90    Define HAVE_ALLOCA to say that the system provides a properly
  91    working alloca function and it should be used.
  92    Define neither one if an assembler-language alloca
  93    in the file alloca.s should be used.  */
  94
  95 /* #define C_ALLOCA */
  96 #define HAVE_ALLOCA
  97 #define alloca(x) __builtin_alloca(x)
  98
  99 /* Define NO_REMAP if memory segmentation makes it not work well
 100    to change the boundary between the text section and data section
 101    when Emacs is dumped.  If you define this, the preloaded Lisp
 102    code will not be sharable; but that's better than failing completely.  */
 103
 104 #define NO_REMAP
 105
 106 /* Define ADDR_CORRECT(ADDR) to be a macro to correct an int which is
 107    the bit pattern of a pointer to a byte into an int which is the
 108    number of a byte.
 109
 110    This macro has a default definition which is usually right.
 111    This default definition is a no-op on most machines (where a
 112    pointer looks like an int) but not on all machines. */
 113
 114 #define ADDR_CORRECT(ADDR) ((int)ADDR)
 115
 116 /* Cast pointers to this type to compare them. */
 117
 118 #define PNTR_COMPARISON_TYPE    void *
 119
 120 /* Some machines that use COFF executables require that each section
 121    start on a certain boundary *in the COFF file*.  Such machines should
 122    define SECTION_ALIGNMENT to a mask of the low-order bits that must be
 123    zero on such a boundary.  This mask is used to control padding between
 124    segments in the COFF file.
 125
 126    If SECTION_ALIGNMENT is not defined, the segments are written
 127    consecutively with no attempt at alignment.  This is right for
 128    unmodified system V.  */
 129
 130 #define SECTION_ALIGNMENT 0x7
 131