[bpt/emacs.git] / src / m / alpha.h

/* Machine description file for the alpha chip.
   Copyright (C) 1994, 1997, 1999, 2001, 2002, 2003, 2004, 2005, 2006,
                 2007, 2008, 2009, 2010, 2011  Free Software Foundation, Inc.

Author: Rainer Schoepf
(according to authors.el)

This file is part of GNU Emacs.

GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

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
along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */


/* The following line tells the configuration script what sort of
   operating system this machine is likely to run.
   USUAL-OPSYS="note"

NOTE-START
Use -opsystem=osf1
NOTE-END

*/

#ifndef _LP64
#define _LP64			/* This doesn't appear to be necessary
				   on OSF 4/5  -- fx.  */
#endif

/* Define WORDS_BIG_ENDIAN if lowest-numbered byte in a word
   is the most significant byte.  */

#undef WORDS_BIG_ENDIAN

/* Define NO_ARG_ARRAY if you cannot take the address of the first of a
 * group of arguments and treat it as an array of the arguments.  */

#define NO_ARG_ARRAY

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

/* __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.

   This flag only matters if you use USE_LISP_UNION_TYPE.  */

#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
   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.  */

/* #define SYSTEM_MALLOC */

#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

#undef UNEXEC
#define UNEXEC unexelf.o
#if !defined(GNU_LINUX) && !defined(__NetBSD__)
#define DATA_START    0x140000000
#endif

#if (defined (__NetBSD__) || defined (__OpenBSD__))
#define HAVE_TEXT_START
#endif

#else  /* not __ELF__ */

/* Describe layout of the address space in an executing process.  */

#define TEXT_START    0x120000000
#define DATA_START    0x140000000

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

#define UNEXEC unexalpha.o

#endif /* __ELF__ */

#if defined (GNU_LINUX) && __GNU_LIBRARY__ - 0 < 6
/* This controls a conditional in main.  */
#define LINUX_SBRK_BUG
#endif

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

#if defined (GNU_LINUX) || defined (__NetBSD__) || defined (__OpenBSD__)
# ifndef __ELF__
#  define COFF
# endif /* notdef __ELF__ */
#endif

/* 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

/* arch-tag: 978cb578-1e25-4a60-819b-adae0972aa78
   (do not change this comment) */
Commit	Line	Data
d36c097a	1	/* Machine description file for the alpha chip.
eb3d11ef	2	Copyright (C) 1994, 1997, 1999, 2001, 2002, 2003, 2004, 2005, 2006,
5df4f04c	3	2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
b061d5f1	4
d36c097a GM	5	Author: Rainer Schoepf
	6	(according to authors.el)
	7
b061d5f1 RS	8	This file is part of GNU Emacs.
b061d5f1 RS	9
eb3d11ef	10	GNU Emacs is free software: you can redistribute it and/or modify
b061d5f1	11	it under the terms of the GNU General Public License as published by
eb3d11ef GM	12	the Free Software Foundation, either version 3 of the License, or
eb3d11ef GM	13	(at your option) any later version.
b061d5f1 RS	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
eb3d11ef	21	along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
b061d5f1 RS	22
b061d5f1 RS	23
177c0ea7	24	/* The following line tells the configuration script what sort of
b061d5f1 RS	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
2eca7f4d	34	#ifndef _LP64
3347875f DL	35	#define _LP64 /* This doesn't appear to be necessary
3347875f DL	36	on OSF 4/5 -- fx. */
2eca7f4d	37	#endif
b061d5f1	38
22e9fe24	39	/* Define WORDS_BIG_ENDIAN if lowest-numbered byte in a word
74d3f806 KH	40	is the most significant byte. */
	41
	42	#undef WORDS_BIG_ENDIAN
	43
b061d5f1 RS	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
b061d5f1	49	/* Now define a symbol for the cpu type, if your compiler
132d0475	50	does not define it automatically. */
b061d5f1 RS	51
	52	/* __alpha defined automatically */
	53
	54
b061d5f1 RS	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
6e5cb96f	59	This flag only matters if you use USE_LISP_UNION_TYPE. */
b061d5f1 RS	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
b061d5f1	71	/* GNU malloc and the relocating allocator do not work together
352c01a5 KH	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. */
b061d5f1	81
76869384	82	/* #define SYSTEM_MALLOC */
b061d5f1	83
821f376d RS	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
821f376d	95
bcd4fb44	96	#undef UNEXEC
1a9bd6bd	97	#define UNEXEC unexelf.o
ca0eb708	98	#if !defined(GNU_LINUX) && !defined(__NetBSD__)
d5e406c3	99	#define DATA_START 0x140000000
bcd4fb44	100	#endif
bdee2ef3 DN	101
	102	#if (defined (__NetBSD__) \|\| defined (__OpenBSD__))
	103	#define HAVE_TEXT_START
685f8511	104	#endif
bcd4fb44	105
bdee2ef3	106	#else /* not __ELF__ */
821f376d	107
b061d5f1 RS	108	/* Describe layout of the address space in an executing process. */
	109
	110	#define TEXT_START 0x120000000
	111	#define DATA_START 0x140000000
	112
821f376d RS	113	/* The program to be used for unexec. */
	114
	115	#define UNEXEC unexalpha.o
	116
bdee2ef3	117	#endif /* __ELF__ */
821f376d	118
cc61af67 DN	119	#if defined (GNU_LINUX) && __GNU_LIBRARY__ - 0 < 6
	120	/* This controls a conditional in main. */
	121	#define LINUX_SBRK_BUG
	122	#endif
	123
821f376d RS	124	/* On the Alpha it's best to avoid including TERMIO since struct
821f376d RS	125	termio and struct termios are mutually incompatible. */
ee803128 RS	126	#define NO_TERMIO
ee803128 RS	127
bdee2ef3	128	#if defined (GNU_LINUX) \|\| defined (__NetBSD__) \|\| defined (__OpenBSD__)
821f376d RS	129	# ifndef __ELF__
821f376d RS	130	# define COFF
821f376d	131	# endif /* notdef __ELF__ */
ee803128	132	#endif
62d9f4b0	133
13d603a9 PE	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
ab5796a9 MB	139
	140	/* arch-tag: 978cb578-1e25-4a60-819b-adae0972aa78
	141	(do not change this comment) */