src/m/alpha.h

   1 /* Machine description file for the alpha chip.
   2
   3 Copyright (C) 1994, 1997, 1999, 2001, 2002, 2003, 2004, 2005, 2006,
   4   2007, 2008, 2009, 2010  Free Software Foundation, Inc.
   5
   6 Author: Rainer Schoepf
   7 (according to authors.el)
   8
   9 This file is part of GNU Emacs.
  10
  11 GNU Emacs is free software: you can redistribute it and/or modify
  12 it under the terms of the GNU General Public License as published by
  13 the Free Software Foundation, either version 3 of the License, or
  14 (at your option) any later version.
  15
  16 GNU Emacs is distributed in the hope that it will be useful,
  17 but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 GNU General Public License for more details.
  20
  21 You should have received a copy of the GNU General Public License
  22 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  23
  24 #ifndef _LP64
  25 #define _LP64 /* This doesn't appear to be necessary on OSF 4/5  -- fx.  */
  26 #endif
  27
  28 /* Now define a symbol for the cpu type, if your compiler
  29    does not define it automatically.  */
  30 /* __alpha defined automatically */
  31
  32
  33 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
  34    the 24-bit bit field into an int.  In other words, if bit fields
  35    are always unsigned.
  36
  37    This flag only matters if you use USE_LISP_UNION_TYPE.  */
  38 #define EXPLICIT_SIGN_EXTEND
  39
  40 /* Data type of load average, as read out of kmem.  */
  41 #define LOAD_AVE_TYPE long
  42
  43 /* Convert that into an integer that is 100 for a load average of 1.0  */
  44 #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
  45
  46 #ifdef __ELF__
  47
  48 #if !defined(GNU_LINUX) && !defined(__NetBSD__)
  49 #define DATA_START    0x140000000
  50 #endif
  51
  52 #else  /* not __ELF__ */
  53
  54 /* Describe layout of the address space in an executing process.  */
  55 #define DATA_START    0x140000000
  56
  57 #endif /* __ELF__ */
  58
  59 /* On the Alpha it's best to avoid including TERMIO since struct
  60    termio and struct termios are mutually incompatible.  */
  61 #define NO_TERMIO
  62
  63 /* Many Alpha implementations (e.g. gas 2.8) can't handle DBL_MIN:
  64    they generate code that uses a signaling NaN instead of DBL_MIN.
  65    Define DBL_MIN_REPLACEMENT to be the next value larger than DBL_MIN:
  66    this avoids the assembler bug.  */
  67 #define DBL_MIN_REPLACEMENT 2.2250738585072019e-308
  68
  69 /* arch-tag: 978cb578-1e25-4a60-819b-adae0972aa78
  70    (do not change this comment) */