src/m/alpha.h

   1 /* Machine description file for the alpha chip.
   2    Copyright (C) 1994, 1997, 1999, 2001, 2002, 2003, 2004, 2005, 2006,
   3                  2007, 2008, 2009, 2010  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
  24 /* The following line tells the configuration script what sort of
  25    operating system this machine is likely to run.
  26    USUAL-OPSYS="note"
  27
  28 NOTE-START
  29 Use -opsystem=osf1
  30 NOTE-END
  31
  32 */
  33
  34 #ifndef _LP64
  35 #define _LP64                   /* This doesn't appear to be necessary
  36                                    on OSF 4/5  -- fx.  */
  37 #endif
  38
  39 /* Define WORDS_BIG_ENDIAN if lowest-numbered byte in a word
  40    is the most significant byte.  */
  41
  42 #undef WORDS_BIG_ENDIAN
  43
  44 /* Now define a symbol for the cpu type, if your compiler
  45    does not define it automatically.  */
  46
  47 /* __alpha defined automatically */
  48
  49
  50 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
  51    the 24-bit bit field into an int.  In other words, if bit fields
  52    are always unsigned.
  53
  54    This flag only matters if you use USE_LISP_UNION_TYPE.  */
  55
  56 #define EXPLICIT_SIGN_EXTEND
  57
  58 /* Data type of load average, as read out of kmem.  */
  59
  60 #define LOAD_AVE_TYPE long
  61
  62 /* Convert that into an integer that is 100 for a load average of 1.0  */
  63
  64 #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
  65
  66 /* GNU malloc and the relocating allocator do not work together
  67    with X.   [Who wrote that?]  */
  68
  69 /* May 1995: reportedly [Rainer Schoepf <schoepf@uni-mainz.de>] both the
  70    system and the gnu malloc system work with "alpha-dec-osf3.0" and
  71    "alpha-dec-osf3.2".  */
  72
  73 /* May 1995: it seems to me [Morten Welinder <terra@diku.dk>] that both
  74    mallocs work with "alpha-dec-osf2.0", but I daren't break anything
  75    right now.  Feel free to play if you want.  */
  76
  77 /* #define SYSTEM_MALLOC */
  78
  79 #ifdef __ELF__
  80
  81 #undef UNEXEC
  82 #define UNEXEC unexelf.o
  83 #if !defined(GNU_LINUX) && !defined(__NetBSD__)
  84 #define DATA_START    0x140000000
  85 #endif
  86
  87 #if (defined (__NetBSD__) || defined (__OpenBSD__))
  88 #define HAVE_TEXT_START
  89 #endif
  90
  91 #else  /* not __ELF__ */
  92
  93 /* Describe layout of the address space in an executing process.  */
  94
  95 #define TEXT_START    0x120000000
  96 #define DATA_START    0x140000000
  97
  98 /* The program to be used for unexec. */
  99
 100 #define UNEXEC unexalpha.o
 101
 102 #endif /* __ELF__ */
 103
 104 /* On the Alpha it's best to avoid including TERMIO since struct
 105    termio and struct termios are mutually incompatible.  */
 106 #define NO_TERMIO
 107
 108 #if defined (GNU_LINUX) || defined (__NetBSD__) || defined (__OpenBSD__)
 109 # ifndef __ELF__
 110 #  define COFF
 111 # endif /* notdef __ELF__ */
 112 #endif
 113
 114 /* Many Alpha implementations (e.g. gas 2.8) can't handle DBL_MIN:
 115    they generate code that uses a signaling NaN instead of DBL_MIN.
 116    Define DBL_MIN_REPLACEMENT to be the next value larger than DBL_MIN:
 117    this avoids the assembler bug.  */
 118 #define DBL_MIN_REPLACEMENT 2.2250738585072019e-308
 119
 120 /* arch-tag: 978cb578-1e25-4a60-819b-adae0972aa78
 121    (do not change this comment) */