[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  Free Software Foundation, Inc.

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
#ifndef GNU_LINUX
#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
b061d5f1	1	/* machine description file For the alpha chip.
eb3d11ef	2	Copyright (C) 1994, 1997, 1999, 2001, 2002, 2003, 2004, 2005, 2006,
76b6f707	3	2007, 2008, 2009 Free Software Foundation, Inc.
b061d5f1 RS	4
	5	This file is part of GNU Emacs.
	6
eb3d11ef	7	GNU Emacs is free software: you can redistribute it and/or modify
b061d5f1	8	it under the terms of the GNU General Public License as published by
eb3d11ef GM	9	the Free Software Foundation, either version 3 of the License, or
eb3d11ef GM	10	(at your option) any later version.
b061d5f1 RS	11
	12	GNU Emacs is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
	17	You should have received a copy of the GNU General Public License
eb3d11ef	18	along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
b061d5f1 RS	19
b061d5f1 RS	20
177c0ea7	21	/* The following line tells the configuration script what sort of
b061d5f1 RS	22	operating system this machine is likely to run.
	23	USUAL-OPSYS="note"
	24
	25	NOTE-START
	26	Use -opsystem=osf1
	27	NOTE-END
	28
	29	*/
	30
2eca7f4d	31	#ifndef _LP64
3347875f DL	32	#define _LP64 /* This doesn't appear to be necessary
3347875f DL	33	on OSF 4/5 -- fx. */
2eca7f4d	34	#endif
b061d5f1	35
22e9fe24	36	/* Define WORDS_BIG_ENDIAN if lowest-numbered byte in a word
74d3f806 KH	37	is the most significant byte. */
	38
	39	#undef WORDS_BIG_ENDIAN
	40
b061d5f1 RS	41	/* Define NO_ARG_ARRAY if you cannot take the address of the first of a
	42	* group of arguments and treat it as an array of the arguments. */
	43
	44	#define NO_ARG_ARRAY
	45
b061d5f1	46	/* Now define a symbol for the cpu type, if your compiler
132d0475	47	does not define it automatically. */
b061d5f1 RS	48
	49	/* __alpha defined automatically */
	50
	51
b061d5f1 RS	52	/* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
	53	the 24-bit bit field into an int. In other words, if bit fields
	54	are always unsigned.
	55
6e5cb96f	56	This flag only matters if you use USE_LISP_UNION_TYPE. */
b061d5f1 RS	57
	58	#define EXPLICIT_SIGN_EXTEND
	59
	60	/* Data type of load average, as read out of kmem. */
	61
	62	#define LOAD_AVE_TYPE long
	63
	64	/* Convert that into an integer that is 100 for a load average of 1.0 */
	65
	66	#define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
	67
b061d5f1	68	/* GNU malloc and the relocating allocator do not work together
352c01a5 KH	69	with X. [Who wrote that?] */
	70
	71	/* May 1995: reportedly [Rainer Schoepf <schoepf@uni-mainz.de>] both the
	72	system and the gnu malloc system work with "alpha-dec-osf3.0" and
	73	"alpha-dec-osf3.2". */
	74
	75	/* May 1995: it seems to me [Morten Welinder <terra@diku.dk>] that both
	76	mallocs work with "alpha-dec-osf2.0", but I daren't break anything
	77	right now. Feel free to play if you want. */
b061d5f1	78
76869384	79	/* #define SYSTEM_MALLOC */
b061d5f1	80
821f376d RS	81	#ifdef __ELF__
	82	/* With ELF, make sure that all common symbols get allocated to in the
	83	data section. Otherwise, the dump of temacs may miss variables in
	84	the shared library that have been initialized. For example, with
	85	GNU libc, __malloc_initialized would normally be resolved to the
	86	shared library's .bss section, which is fatal. */
	87	# ifdef __GNUC__
	88	# define C_SWITCH_MACHINE -fno-common
	89	# else
	90	# error What gives? Fix me if DEC Unix supports ELF now.
	91	# endif
821f376d	92
bcd4fb44	93	#undef UNEXEC
1a9bd6bd	94	#define UNEXEC unexelf.o
bdee2ef3	95	#ifndef GNU_LINUX
d5e406c3	96	#define DATA_START 0x140000000
bcd4fb44	97	#endif
bdee2ef3 DN	98
	99	#if (defined (__NetBSD__) \|\| defined (__OpenBSD__))
	100	#define HAVE_TEXT_START
685f8511	101	#endif
bcd4fb44	102
bdee2ef3	103	#else /* not __ELF__ */
821f376d	104
b061d5f1 RS	105	/* Describe layout of the address space in an executing process. */
	106
	107	#define TEXT_START 0x120000000
	108	#define DATA_START 0x140000000
	109
821f376d RS	110	/* The program to be used for unexec. */
	111
	112	#define UNEXEC unexalpha.o
	113
bdee2ef3	114	#endif /* __ELF__ */
821f376d	115
cc61af67 DN	116	#if defined (GNU_LINUX) && __GNU_LIBRARY__ - 0 < 6
	117	/* This controls a conditional in main. */
	118	#define LINUX_SBRK_BUG
	119	#endif
	120
821f376d RS	121	/* On the Alpha it's best to avoid including TERMIO since struct
821f376d RS	122	termio and struct termios are mutually incompatible. */
ee803128 RS	123	#define NO_TERMIO
ee803128 RS	124
bdee2ef3	125	#if defined (GNU_LINUX) \|\| defined (__NetBSD__) \|\| defined (__OpenBSD__)
821f376d RS	126	# ifndef __ELF__
821f376d RS	127	# define COFF
821f376d	128	# endif /* notdef __ELF__ */
ee803128	129	#endif
62d9f4b0	130
13d603a9 PE	131	/* Many Alpha implementations (e.g. gas 2.8) can't handle DBL_MIN:
	132	they generate code that uses a signaling NaN instead of DBL_MIN.
	133	Define DBL_MIN_REPLACEMENT to be the next value larger than DBL_MIN:
	134	this avoids the assembler bug. */
	135	#define DBL_MIN_REPLACEMENT 2.2250738585072019e-308
ab5796a9 MB	136
	137	/* arch-tag: 978cb578-1e25-4a60-819b-adae0972aa78
	138	(do not change this comment) */