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

/* machine description file for Elxsi machine (running enix).
   Copyright (C) 1986, 1992 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, 675 Mass Ave, Cambridge, MA 02139, 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. */

/* The following three symbols give information on
 the size of various data types.  */

#define SHORTBITS 16		/* Number of bits in a short */

#define INTBITS 32		/* Number of bits in an int */

#define LONGBITS 32		/* Number of bits in a long */

/* 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 C_ALLOCA if this machine does not support a true alloca
   and the one written in C should be used instead.
   Define HAVE_ALLOCA to say that the system provides a properly
   working alloca function and it should be used.
   Define neither one if an assembler-language alloca
   in the file alloca.s should be used.  */

#define C_ALLOCA
/*#define HAVE_ALLOCA */

/* 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;\
}
Commit	Line	Data
20c428fd	1	/* machine description file for Elxsi machine (running enix).
b9706ae4	2	Copyright (C) 1986, 1992 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
	19	the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
	20
	21	/* The following line tells the configuration script what sort of
	22	operating system this machine is likely to run.
	23	USUAL-OPSYS="usg5-2" */
	24
	25	/* This file was modified by Matt Crawford <matt@tank.uchicago.edu>
	26	to work under Elxsi's 12.0 release of BSD unix. */
	27
	28	/* The following three symbols give information on
	29	the size of various data types. */
	30
	31	#define SHORTBITS 16 /* Number of bits in a short */
	32
	33	#define INTBITS 32 /* Number of bits in an int */
	34
	35	#define LONGBITS 32 /* Number of bits in a long */
	36
20c428fd JB	37	/* Define NO_ARG_ARRAY if you cannot take the address of the first of a
	38	* group of arguments and treat it as an array of the arguments. */
	39
	40	/#define NO_ARG_ARRAY /
	41
	42	/* Define WORD_MACHINE if addresses and such have
	43	* to be corrected before they can be used as byte counts. */
	44
	45	/#define WORD_MACHINE /
	46
20c428fd JB	47	/* Now define a symbol for the cpu type, if your compiler
	48	does not define it automatically:
	49	vax, m68000, ns16000, pyramid, orion, tahoe and APOLLO
	50	are the ones defined so far. */
	51
	52	#ifndef elxsi
	53	#define elxsi
	54	#endif
	55
	56	/* Use type int rather than a union, to represent Lisp_Object */
	57	/* This is desirable for most machines. */
	58
	59	#define NO_UNION_TYPE
	60
	61	/* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
	62	the 24-bit bit field into an int. In other words, if bit fields
	63	are always unsigned.
	64
	65	If you use NO_UNION_TYPE, this flag does not matter. */
	66
	67	#define EXPLICIT_SIGN_EXTEND
	68
	69
	70	/* Name of kernel load average variable */
	71
	72	#undef LDAV_SYMBOL
	73	#define LDAV_SYMBOL "avenrun"
	74
	75	/* Data type of load average, as read out of kmem. */
	76
	77	#define LOAD_AVE_TYPE double
	78
	79	/* Convert that into an integer that is 100 for a load average of 1.0 */
	80
	81	#define LOAD_AVE_CVT(x) (int) ((x) * 100.0)
	82
	83	/* Define CANNOT_DUMP on machines where unexec does not work.
	84	Then the function dump-emacs will not be defined
	85	and temacs will do (load "loadup") automatically unless told otherwise.
	86
b9706ae4 JB	87	Earlier versions couldn't dump.
	88	Changes for 12.0 release are in 19.1.
	89	Dumping should work now. */
20c428fd JB	90
	91	/* #define CANNOT_DUMP */
	92
	93	/* Define VIRT_ADDR_VARIES if the virtual addresses of
	94	pure and impure space as loaded can vary, and even their
	95	relative order cannot be relied on.
	96
	97	Otherwise Emacs assumes that text space precedes data space,
	98	numerically. */
	99
	100	/* #define VIRT_ADDR_VARIES */
	101
	102	/* Define C_ALLOCA if this machine does not support a true alloca
	103	and the one written in C should be used instead.
	104	Define HAVE_ALLOCA to say that the system provides a properly
	105	working alloca function and it should be used.
	106	Define neither one if an assembler-language alloca
	107	in the file alloca.s should be used. */
	108
	109	#define C_ALLOCA
	110	/#define HAVE_ALLOCA /
	111
	112	/* Define NO_REMAP if memory segmentation makes it not work well
	113	to change the boundary between the text section and data section
	114	when Emacs is dumped. If you define this, the preloaded Lisp
	115	code will not be sharable; but that's better than failing completely. */
	116	/#define NO_REMAP/
	117
	118	/* This is a guess for an alternate solution to whatever
	119	problem motivated defining _sobuf in sysdep,c with extern char _sobuf. /
	120	#define _sobuf xsobuf
	121
	122	/* Address of start of text segment as loaded. */
	123
	124	#define TEXT_START 0x800
	125
	126	/* Tell crt0.c not to define environ. */
	127
	128	#define DONT_NEED_ENVIRON
	129
	130	/* The elxsi has no debugger, so might as well optimize instead
	131	of trying to make a symbol table. */
	132
	133	#define C_DEBUG_SWITCH -O
	134
	135	/* Elxsi uses COFF under both Sys V and BSD environments */
	136
	137	#define COFF
	138
	139	#define ADJUST_EXEC_HEADER {\
	140	extern int _init_brk;\
	141	_init_brk = bss_start;\
	142	}