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

/* machine description file for Elxsi machine (running enix).
   Copyright (C) 1986, 1992, 2002 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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, 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).
d8f6d720	2	Copyright (C) 1986, 1992, 2002 Free Software Foundation, Inc.
20c428fd JB	3	Adapted by John Salmon
	4
	5	This file is part of GNU Emacs.
	6
	7	GNU Emacs is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
17385adc	9	the Free Software Foundation; either version 2, or (at your option)
20c428fd JB	10	any later version.
	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
	18	along with GNU Emacs; see the file COPYING. If not, write to
3b7ad313 EN	19	the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
3b7ad313 EN	20	Boston, MA 02111-1307, USA. */
20c428fd	21
177c0ea7	22	/* The following line tells the configuration script what sort of
20c428fd JB	23	operating system this machine is likely to run.
	24	USUAL-OPSYS="usg5-2" */
	25
	26	/* This file was modified by Matt Crawford <matt@tank.uchicago.edu>
	27	to work under Elxsi's 12.0 release of BSD unix. */
	28
74d3f806 KH	29	/* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
	30	is the most significant byte. */
	31
	32	#undef WORDS_BIG_ENDIAN
	33
20c428fd JB	34	/* Define NO_ARG_ARRAY if you cannot take the address of the first of a
	35	* group of arguments and treat it as an array of the arguments. */
	36
	37	/#define NO_ARG_ARRAY /
	38
	39	/* Define WORD_MACHINE if addresses and such have
	40	* to be corrected before they can be used as byte counts. */
	41
	42	/#define WORD_MACHINE /
	43
20c428fd JB	44	/* Now define a symbol for the cpu type, if your compiler
	45	does not define it automatically:
	46	vax, m68000, ns16000, pyramid, orion, tahoe and APOLLO
	47	are the ones defined so far. */
	48
	49	#ifndef elxsi
	50	#define elxsi
	51	#endif
	52
	53	/* Use type int rather than a union, to represent Lisp_Object */
	54	/* This is desirable for most machines. */
	55
	56	#define NO_UNION_TYPE
	57
	58	/* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
	59	the 24-bit bit field into an int. In other words, if bit fields
	60	are always unsigned.
	61
	62	If you use NO_UNION_TYPE, this flag does not matter. */
	63
	64	#define EXPLICIT_SIGN_EXTEND
	65
	66
	67	/* Name of kernel load average variable */
	68
	69	#undef LDAV_SYMBOL
	70	#define LDAV_SYMBOL "avenrun"
	71
	72	/* Data type of load average, as read out of kmem. */
	73
	74	#define LOAD_AVE_TYPE double
	75
	76	/* Convert that into an integer that is 100 for a load average of 1.0 */
	77
	78	#define LOAD_AVE_CVT(x) (int) ((x) * 100.0)
	79
	80	/* Define CANNOT_DUMP on machines where unexec does not work.
	81	Then the function dump-emacs will not be defined
	82	and temacs will do (load "loadup") automatically unless told otherwise.
	83
b9706ae4 JB	84	Earlier versions couldn't dump.
	85	Changes for 12.0 release are in 19.1.
	86	Dumping should work now. */
20c428fd JB	87
	88	/* #define CANNOT_DUMP */
	89
	90	/* Define VIRT_ADDR_VARIES if the virtual addresses of
	91	pure and impure space as loaded can vary, and even their
	92	relative order cannot be relied on.
	93
	94	Otherwise Emacs assumes that text space precedes data space,
	95	numerically. */
	96
	97	/* #define VIRT_ADDR_VARIES */
	98
20c428fd JB	99	/* Define NO_REMAP if memory segmentation makes it not work well
	100	to change the boundary between the text section and data section
	101	when Emacs is dumped. If you define this, the preloaded Lisp
	102	code will not be sharable; but that's better than failing completely. */
	103	/#define NO_REMAP/
	104
	105	/* This is a guess for an alternate solution to whatever
	106	problem motivated defining _sobuf in sysdep,c with extern char _sobuf. /
	107	#define _sobuf xsobuf
	108
	109	/* Address of start of text segment as loaded. */
	110
	111	#define TEXT_START 0x800
	112
	113	/* Tell crt0.c not to define environ. */
	114
	115	#define DONT_NEED_ENVIRON
	116
	117	/* The elxsi has no debugger, so might as well optimize instead
	118	of trying to make a symbol table. */
	119
	120	#define C_DEBUG_SWITCH -O
	121
	122	/* Elxsi uses COFF under both Sys V and BSD environments */
	123
	124	#define COFF
	125
	126	#define ADJUST_EXEC_HEADER {\
	127	extern int _init_brk;\
	128	_init_brk = bss_start;\
	129	}
6b61353c KH	130
	131	/* arch-tag: 73bf1120-a994-4c29-8d60-af425d8bf10c
	132	(do not change this comment) */