code.delx.au - gnu-emacs/blob - 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, 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
  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 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  45  * group of arguments and treat it as an array of the arguments.  */
  46
  47 #define NO_ARG_ARRAY
  48
  49 /* Now define a symbol for the cpu type, if your compiler
  50    does not define it automatically.  */
  51
  52 /* __alpha defined automatically */
  53
  54
  55 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
  56    the 24-bit bit field into an int.  In other words, if bit fields
  57    are always unsigned.
  58
  59    This flag only matters if you use USE_LISP_UNION_TYPE.  */
  60
  61 #define EXPLICIT_SIGN_EXTEND
  62
  63 /* Data type of load average, as read out of kmem.  */
  64
  65 #define LOAD_AVE_TYPE long
  66
  67 /* Convert that into an integer that is 100 for a load average of 1.0  */
  68
  69 #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
  70
  71 /* GNU malloc and the relocating allocator do not work together
  72    with X.   [Who wrote that?]  */
  73
  74 /* May 1995: reportedly [Rainer Schoepf <schoepf@uni-mainz.de>] both the
  75    system and the gnu malloc system work with "alpha-dec-osf3.0" and
  76    "alpha-dec-osf3.2".  */
  77
  78 /* May 1995: it seems to me [Morten Welinder <terra@diku.dk>] that both
  79    mallocs work with "alpha-dec-osf2.0", but I daren't break anything
  80    right now.  Feel free to play if you want.  */
  81
  82 /* #define SYSTEM_MALLOC */
  83
  84 #ifdef __ELF__
  85 /* With ELF, make sure that all common symbols get allocated to in the
  86    data section.  Otherwise, the dump of temacs may miss variables in
  87    the shared library that have been initialized.  For example, with
  88    GNU libc, __malloc_initialized would normally be resolved to the
  89    shared library's .bss section, which is fatal.  */
  90 # ifdef __GNUC__
  91 #  define C_SWITCH_MACHINE      -fno-common
  92 # else
  93 #  error What gives?  Fix me if DEC Unix supports ELF now.
  94 # endif
  95
  96 #undef UNEXEC
  97 #define UNEXEC unexelf.o
  98 #if !defined(GNU_LINUX) && !defined(__NetBSD__)
  99 #define DATA_START    0x140000000
 100 #endif
 101
 102 #if (defined (__NetBSD__) || defined (__OpenBSD__))
 103 #define HAVE_TEXT_START
 104 #endif
 105
 106 #else  /* not __ELF__ */
 107
 108 /* Describe layout of the address space in an executing process.  */
 109
 110 #define TEXT_START    0x120000000
 111 #define DATA_START    0x140000000
 112
 113 /* The program to be used for unexec. */
 114
 115 #define UNEXEC unexalpha.o
 116
 117 #endif /* __ELF__ */
 118
 119 #if defined (GNU_LINUX) && __GNU_LIBRARY__ - 0 < 6
 120 /* This controls a conditional in main.  */
 121 #define LINUX_SBRK_BUG
 122 #endif
 123
 124 /* On the Alpha it's best to avoid including TERMIO since struct
 125    termio and struct termios are mutually incompatible.  */
 126 #define NO_TERMIO
 127
 128 #if defined (GNU_LINUX) || defined (__NetBSD__) || defined (__OpenBSD__)
 129 # ifndef __ELF__
 130 #  define COFF
 131 # endif /* notdef __ELF__ */
 132 #endif
 133
 134 /* Many Alpha implementations (e.g. gas 2.8) can't handle DBL_MIN:
 135    they generate code that uses a signaling NaN instead of DBL_MIN.
 136    Define DBL_MIN_REPLACEMENT to be the next value larger than DBL_MIN:
 137    this avoids the assembler bug.  */
 138 #define DBL_MIN_REPLACEMENT 2.2250738585072019e-308
 139
 140 /* arch-tag: 978cb578-1e25-4a60-819b-adae0972aa78
 141    (do not change this comment) */