src/m/mips.h

   1 /* m- file for Mips machines.
   2    Copyright (C) 1987, 1992, 1999, 2001, 2002, 2003, 2004, 2005, 2006,
   3                  2007, 2008, 2009  Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software: you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation, either version 3 of the License, or
  10 (at your option) any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20
  21 /* The following line tells the configuration script what sort of
  22    operating system this machine is likely to run.
  23    USUAL-OPSYS="note"
  24
  25 NOTE-START
  26 This is only used on GNU/Linux.
  27 NOTE-END  */
  28
  29 /* Define WORDS_BIG_ENDIAN if lowest-numbered byte in a word
  30    is the most significant byte.  */
  31
  32 #if ! (defined (__MIPSEL__) || defined (MIPSEL) || defined (_MIPSEL))
  33 #define WORDS_BIG_ENDIAN
  34 #endif
  35
  36 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  37  * group of arguments and treat it as an array of the arguments.  */
  38
  39 #define NO_ARG_ARRAY
  40
  41 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
  42    the 24-bit bit field into an int.  In other words, if bit fields
  43    are always unsigned.
  44
  45    This flag only matters if you use USE_LISP_UNION_TYPE.  */
  46
  47 #define EXPLICIT_SIGN_EXTEND
  48
  49 /* Describe layout of the address space in an executing process.  */
  50
  51 #define TEXT_START      0x00400000
  52 #define DATA_START      0x10000000
  53
  54 \f
  55 #if 0 /* These definitions were advantageous when not using
  56          USE_LSB_TAG.  With that, they get ignored but cause errors.  */
  57
  58 #define DATA_SEG_BITS   0x10000000
  59
  60 /* The standard definitions of these macros would work ok,
  61    but these are faster because the constants are short.  */
  62
  63 #define XUINT(a) (((unsigned)(a) << (BITS_PER_INT-VALBITS)) >> (BITS_PER_INT-VALBITS))
  64
  65 #define XSET(var, type, ptr)                                            \
  66   ((var) =                                                              \
  67    ((int)(type) << VALBITS)                                             \
  68    + (((unsigned) (ptr) << (BITS_PER_INT-VALBITS)) >> (BITS_PER_INT-VALBITS)))
  69
  70 /* arch-tag: 8fd020ee-78a7-4d87-96ce-6129f52f7bee
  71    (do not change this comment) */
  72
  73 #endif /* 0 */
  74