src/m/elxsi.h

   1 /* machine description file for Elxsi machine (running enix).
   2    Copyright (C) 1986, 1992, 2001, 2002, 2003, 2004,
   3                  2005, 2006, 2007  Free Software Foundation, Inc.
   4    Adapted by John Salmon
   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 3, 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., 51 Franklin Street, Fifth Floor,
  21 Boston, MA 02110-1301, USA.  */
  22
  23 /* The following line tells the configuration script what sort of
  24    operating system this machine is likely to run.
  25    USUAL-OPSYS="usg5-2"  */
  26
  27 /* This file was modified by Matt Crawford <matt@tank.uchicago.edu>
  28    to work under Elxsi's 12.0 release of BSD unix. */
  29
  30 /* Define WORDS_BIG_ENDIAN if lowest-numbered byte in a word
  31    is the most significant byte.  */
  32
  33 #undef WORDS_BIG_ENDIAN
  34
  35 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  36  * group of arguments and treat it as an array of the arguments.  */
  37
  38 /*#define NO_ARG_ARRAY */
  39
  40 /* Define WORD_MACHINE if addresses and such have
  41  * to be corrected before they can be used as byte counts.  */
  42
  43 /*#define WORD_MACHINE */
  44
  45 /* Now define a symbol for the cpu type, if your compiler
  46    does not define it automatically:
  47    vax, m68000, ns16000, pyramid, orion, tahoe and APOLLO
  48    are the ones defined so far.  */
  49
  50 #ifndef elxsi
  51 #define elxsi
  52 #endif
  53
  54 /* Use type int rather than a union, to represent Lisp_Object */
  55 /* This is desirable for most machines.  */
  56
  57 #define NO_UNION_TYPE
  58
  59 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
  60    the 24-bit bit field into an int.  In other words, if bit fields
  61    are always unsigned.
  62
  63    If you use NO_UNION_TYPE, this flag does not matter.  */
  64
  65 #define EXPLICIT_SIGN_EXTEND
  66
  67
  68 /* Name of kernel load average variable */
  69
  70 #undef LDAV_SYMBOL
  71 #define LDAV_SYMBOL "avenrun"
  72
  73 /* Data type of load average, as read out of kmem.  */
  74
  75 #define LOAD_AVE_TYPE double
  76
  77 /* Convert that into an integer that is 100 for a load average of 1.0  */
  78
  79 #define LOAD_AVE_CVT(x) (int) ((x) * 100.0)
  80
  81 /* Define CANNOT_DUMP on machines where unexec does not work.
  82    Then the function dump-emacs will not be defined
  83    and temacs will do (load "loadup") automatically unless told otherwise.
  84
  85    Earlier versions couldn't dump.
  86    Changes for 12.0 release are in 19.1.
  87    Dumping should work now.  */
  88
  89 /* #define CANNOT_DUMP */
  90
  91 /* Define VIRT_ADDR_VARIES if the virtual addresses of
  92    pure and impure space as loaded can vary, and even their
  93    relative order cannot be relied on.
  94
  95    Otherwise Emacs assumes that text space precedes data space,
  96    numerically.  */
  97
  98 /* #define VIRT_ADDR_VARIES */
  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 /*#define NO_REMAP*/
 105
 106 /* This is a guess for an alternate solution to whatever
 107    problem motivated defining _sobuf in sysdep,c with extern char *_sobuf.  */
 108 #define _sobuf xsobuf
 109
 110 /* Address of start of text segment as loaded.  */
 111
 112 #define TEXT_START      0x800
 113
 114 /* Tell crt0.c not to define environ.  */
 115
 116 #define DONT_NEED_ENVIRON
 117
 118 /* The elxsi has no debugger, so might as well optimize instead
 119    of trying to make a symbol table.  */
 120
 121 #define C_DEBUG_SWITCH -O
 122
 123 /* Elxsi uses COFF under both Sys V and BSD environments */
 124
 125 #define COFF
 126
 127 #define ADJUST_EXEC_HEADER {\
 128 extern int _init_brk;\
 129 _init_brk = bss_start;\
 130 }
 131
 132 /* arch-tag: 73bf1120-a994-4c29-8d60-af425d8bf10c
 133    (do not change this comment) */