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

/* machine description file for Elxsi machine (running enix).
   Copyright (C) 1986, 1992, 2002, 2003, 2004,
                 2005, 2006 Free Software Foundation, Inc.
   Adapted by John Salmon

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 2, 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; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.  */

/* The following line tells the configuration script what sort of
   operating system this machine is likely to run.
   USUAL-OPSYS="usg5-2"  */

/* This file was modified by Matt Crawford <matt@tank.uchicago.edu>
   to work under Elxsi's 12.0 release of BSD unix. */

/* Define WORDS_BIG_ENDIAN iff 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 */

/* Define WORD_MACHINE if addresses and such have
 * to be corrected before they can be used as byte counts.  */

/*#define WORD_MACHINE */

/* Now define a symbol for the cpu type, if your compiler
   does not define it automatically:
   vax, m68000, ns16000, pyramid, orion, tahoe and APOLLO
   are the ones defined so far.  */

#ifndef elxsi
#define elxsi
#endif

/* Use type int rather than a union, to represent Lisp_Object */
/* This is desirable for most machines.  */

#define NO_UNION_TYPE

/* 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.

   If you use NO_UNION_TYPE, this flag does not matter.  */

#define EXPLICIT_SIGN_EXTEND


/* Name of kernel load average variable */

#undef LDAV_SYMBOL
#define LDAV_SYMBOL "avenrun"

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

#define LOAD_AVE_TYPE double

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

#define LOAD_AVE_CVT(x) (int) ((x) * 100.0)

/* Define CANNOT_DUMP on machines where unexec does not work.
   Then the function dump-emacs will not be defined
   and temacs will do (load "loadup") automatically unless told otherwise.

   Earlier versions couldn't dump.
   Changes for 12.0 release are in 19.1.
   Dumping should work now.  */

/* #define CANNOT_DUMP */

/* Define VIRT_ADDR_VARIES if the virtual addresses of
   pure and impure space as loaded can vary, and even their
   relative order cannot be relied on.

   Otherwise Emacs assumes that text space precedes data space,
   numerically.  */

/* #define VIRT_ADDR_VARIES */

/* Define NO_REMAP if memory segmentation makes it not work well
   to change the boundary between the text section and data section
   when Emacs is dumped.  If you define this, the preloaded Lisp
   code will not be sharable; but that's better than failing completely.  */
/*#define NO_REMAP*/

/* This is a guess for an alternate solution to whatever
   problem motivated defining _sobuf in sysdep,c with extern char *_sobuf.  */
#define _sobuf xsobuf

/* Address of start of text segment as loaded.  */

#define TEXT_START	0x800

/* Tell crt0.c not to define environ.  */

#define DONT_NEED_ENVIRON

/* The elxsi has no debugger, so might as well optimize instead
   of trying to make a symbol table.  */

#define C_DEBUG_SWITCH -O

/* Elxsi uses COFF under both Sys V and BSD environments */

#define COFF

#define ADJUST_EXEC_HEADER {\
extern int _init_brk;\
_init_brk = bss_start;\
}

/* arch-tag: 73bf1120-a994-4c29-8d60-af425d8bf10c
   (do not change this comment) */
Commit	Line	Data
20c428fd	1	/* machine description file for Elxsi machine (running enix).
b908093d	2	Copyright (C) 1986, 1992, 2002, 2003, 2004,
aaef169d	3	2005, 2006 Free Software Foundation, Inc.
20c428fd JB	4	Adapted by John Salmon
	5
	6	This file is part of GNU Emacs.
	7
	8	GNU Emacs is free software; you can redistribute it and/or modify
	9	it under the terms of the GNU General Public License as published by
17385adc	10	the Free Software Foundation; either version 2, or (at your option)
20c428fd JB	11	any later version.
	12
	13	GNU Emacs is distributed in the hope that it will be useful,
	14	but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	GNU General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
	19	along with GNU Emacs; see the file COPYING. If not, write to
364c38d3 LK	20	the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
364c38d3 LK	21	Boston, MA 02110-1301, USA. */
20c428fd	22
177c0ea7	23	/* The following line tells the configuration script what sort of
20c428fd JB	24	operating system this machine is likely to run.
	25	USUAL-OPSYS="usg5-2" */
	26
	27	/* This file was modified by Matt Crawford <matt@tank.uchicago.edu>
	28	to work under Elxsi's 12.0 release of BSD unix. */
	29
74d3f806 KH	30	/* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
	31	is the most significant byte. */
	32
	33	#undef WORDS_BIG_ENDIAN
	34
20c428fd JB	35	/* Define NO_ARG_ARRAY if you cannot take the address of the first of a
	36	* group of arguments and treat it as an array of the arguments. */
	37
	38	/#define NO_ARG_ARRAY /
	39
	40	/* Define WORD_MACHINE if addresses and such have
	41	* to be corrected before they can be used as byte counts. */
	42
	43	/#define WORD_MACHINE /
	44
20c428fd JB	45	/* Now define a symbol for the cpu type, if your compiler
	46	does not define it automatically:
	47	vax, m68000, ns16000, pyramid, orion, tahoe and APOLLO
	48	are the ones defined so far. */
	49
	50	#ifndef elxsi
	51	#define elxsi
	52	#endif
	53
	54	/* Use type int rather than a union, to represent Lisp_Object */
	55	/* This is desirable for most machines. */
	56
	57	#define NO_UNION_TYPE
	58
	59	/* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
	60	the 24-bit bit field into an int. In other words, if bit fields
	61	are always unsigned.
	62
	63	If you use NO_UNION_TYPE, this flag does not matter. */
	64
	65	#define EXPLICIT_SIGN_EXTEND
	66
	67
	68	/* Name of kernel load average variable */
	69
	70	#undef LDAV_SYMBOL
	71	#define LDAV_SYMBOL "avenrun"
	72
	73	/* Data type of load average, as read out of kmem. */
	74
	75	#define LOAD_AVE_TYPE double
	76
	77	/* Convert that into an integer that is 100 for a load average of 1.0 */
	78
	79	#define LOAD_AVE_CVT(x) (int) ((x) * 100.0)
	80
	81	/* Define CANNOT_DUMP on machines where unexec does not work.
	82	Then the function dump-emacs will not be defined
	83	and temacs will do (load "loadup") automatically unless told otherwise.
	84
b9706ae4 JB	85	Earlier versions couldn't dump.
	86	Changes for 12.0 release are in 19.1.
	87	Dumping should work now. */
20c428fd JB	88
	89	/* #define CANNOT_DUMP */
	90
	91	/* Define VIRT_ADDR_VARIES if the virtual addresses of
	92	pure and impure space as loaded can vary, and even their
	93	relative order cannot be relied on.
	94
	95	Otherwise Emacs assumes that text space precedes data space,
	96	numerically. */
	97
	98	/* #define VIRT_ADDR_VARIES */
	99
20c428fd JB	100	/* Define NO_REMAP if memory segmentation makes it not work well
	101	to change the boundary between the text section and data section
	102	when Emacs is dumped. If you define this, the preloaded Lisp
	103	code will not be sharable; but that's better than failing completely. */
	104	/#define NO_REMAP/
	105
	106	/* This is a guess for an alternate solution to whatever
	107	problem motivated defining _sobuf in sysdep,c with extern char _sobuf. /
	108	#define _sobuf xsobuf
	109
	110	/* Address of start of text segment as loaded. */
	111
	112	#define TEXT_START 0x800
	113
	114	/* Tell crt0.c not to define environ. */
	115
	116	#define DONT_NEED_ENVIRON
	117
	118	/* The elxsi has no debugger, so might as well optimize instead
	119	of trying to make a symbol table. */
	120
	121	#define C_DEBUG_SWITCH -O
	122
	123	/* Elxsi uses COFF under both Sys V and BSD environments */
	124
	125	#define COFF
	126
	127	#define ADJUST_EXEC_HEADER {\
	128	extern int _init_brk;\
	129	_init_brk = bss_start;\
	130	}
ab5796a9 MB	131
	132	/* arch-tag: 73bf1120-a994-4c29-8d60-af425d8bf10c
	133	(do not change this comment) */