src/m/alpha.h

   1 /* Machine description file for the alpha chip.
   2
   3 Copyright (C) 1994, 1997, 1999, 2001-2011  Free Software Foundation, Inc.
   4
   5 Author: Rainer Schoepf
   6 (according to authors.el)
   7
   8 This file is part of GNU Emacs.
   9
  10 GNU Emacs is free software: you can redistribute it and/or modify
  11 it under the terms of the GNU General Public License as published by
  12 the Free Software Foundation, either version 3 of the License, or
  13 (at your option) any later version.
  14
  15 GNU Emacs is distributed in the hope that it will be useful,
  16 but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 GNU General Public License for more details.
  19
  20 You should have received a copy of the GNU General Public License
  21 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  22
  23 #ifndef _LP64
  24 #define _LP64 /* This doesn't appear to be necessary on OSF 4/5  -- fx.  */
  25 #endif
  26
  27 /* Now define a symbol for the cpu type, if your compiler
  28    does not define it automatically.  */
  29 /* __alpha defined automatically */
  30
  31
  32 /* Data type of load average, as read out of kmem.  */
  33 #define LOAD_AVE_TYPE long
  34
  35 /* Convert that into an integer that is 100 for a load average of 1.0  */
  36 #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
  37
  38 #ifdef __ELF__
  39
  40 #if !defined(GNU_LINUX) && !defined(__NetBSD__)
  41 #define DATA_START    0x140000000
  42 #endif
  43
  44 #else  /* not __ELF__ */
  45
  46 /* Describe layout of the address space in an executing process.  */
  47 #define DATA_START    0x140000000
  48
  49 #endif /* __ELF__ */
  50
  51 /* On the Alpha it's best to avoid including TERMIO since struct
  52    termio and struct termios are mutually incompatible.  */
  53 #define NO_TERMIO
  54
  55 /* Many Alpha implementations (e.g. gas 2.8) can't handle DBL_MIN:
  56    they generate code that uses a signaling NaN instead of DBL_MIN.
  57    Define DBL_MIN_REPLACEMENT to be the next value larger than DBL_MIN:
  58    this avoids the assembler bug.  */
  59 #define DBL_MIN_REPLACEMENT 2.2250738585072019e-308
  60