alpha.h 3.93 KB
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/* Machine description file for the alpha chip.
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   Copyright (C) 1994, 1997, 1999, 2001, 2002, 2003, 2004, 2005, 2006,
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                 2007, 2008, 2009, 2010  Free Software Foundation, Inc.
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Author: Rainer Schoepf
(according to authors.el)

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This file is part of GNU Emacs.

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GNU Emacs is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
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GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
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along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
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/* The following line tells the configuration script what sort of
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   operating system this machine is likely to run.
   USUAL-OPSYS="note"

NOTE-START
Use -opsystem=osf1
NOTE-END

*/

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#ifndef _LP64
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#define _LP64			/* This doesn't appear to be necessary
				   on OSF 4/5  -- fx.  */
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#endif
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/* Define WORDS_BIG_ENDIAN if lowest-numbered byte in a word
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   is the most significant byte.  */

#undef WORDS_BIG_ENDIAN

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/* Now define a symbol for the cpu type, if your compiler
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   does not define it automatically.  */
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/* __alpha defined automatically */


/* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
   the 24-bit bit field into an int.  In other words, if bit fields
   are always unsigned.

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   This flag only matters if you use USE_LISP_UNION_TYPE.  */
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#define EXPLICIT_SIGN_EXTEND

/* Data type of load average, as read out of kmem.  */

#define LOAD_AVE_TYPE long

/* Convert that into an integer that is 100 for a load average of 1.0  */

#define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)

/* GNU malloc and the relocating allocator do not work together
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   with X.   [Who wrote that?]  */

/* May 1995: reportedly [Rainer Schoepf <schoepf@uni-mainz.de>] both the
   system and the gnu malloc system work with "alpha-dec-osf3.0" and
   "alpha-dec-osf3.2".  */

/* May 1995: it seems to me [Morten Welinder <terra@diku.dk>] that both
   mallocs work with "alpha-dec-osf2.0", but I daren't break anything
   right now.  Feel free to play if you want.  */
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/* #define SYSTEM_MALLOC */
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#ifdef __ELF__
/* With ELF, make sure that all common symbols get allocated to in the
   data section.  Otherwise, the dump of temacs may miss variables in
   the shared library that have been initialized.  For example, with
   GNU libc, __malloc_initialized would normally be resolved to the
   shared library's .bss section, which is fatal.  */
# ifdef __GNUC__
#  define C_SWITCH_MACHINE	-fno-common
# else
#  error What gives?  Fix me if DEC Unix supports ELF now.
# endif

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#undef UNEXEC
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#define UNEXEC unexelf.o
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#if !defined(GNU_LINUX) && !defined(__NetBSD__)
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#define DATA_START    0x140000000
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#endif
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#if (defined (__NetBSD__) || defined (__OpenBSD__))
#define HAVE_TEXT_START
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#endif
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#else  /* not __ELF__ */
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/* Describe layout of the address space in an executing process.  */

#define TEXT_START    0x120000000
#define DATA_START    0x140000000

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/* The program to be used for unexec. */

#define UNEXEC unexalpha.o

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#endif /* __ELF__ */
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/* On the Alpha it's best to avoid including TERMIO since struct
   termio and struct termios are mutually incompatible.  */
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#define NO_TERMIO

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#if defined (GNU_LINUX) || defined (__NetBSD__) || defined (__OpenBSD__)
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# ifndef __ELF__
#  define COFF
# endif /* notdef __ELF__ */
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#endif
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/* Many Alpha implementations (e.g. gas 2.8) can't handle DBL_MIN:
   they generate code that uses a signaling NaN instead of DBL_MIN.
   Define DBL_MIN_REPLACEMENT to be the next value larger than DBL_MIN:
   this avoids the assembler bug.  */
#define DBL_MIN_REPLACEMENT 2.2250738585072019e-308
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/* arch-tag: 978cb578-1e25-4a60-819b-adae0972aa78
   (do not change this comment) */