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

/* machine description file for Data General AViiON.
   Copyright (C) 1985, 1986, 1991 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 1, 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 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 BIG_ENDIAN iff lowest-numbered byte in a word
   is the most significant byte.  */

#define 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

/* Define DATA_SEG_BITS if pointers need to be corrected with
   a segment field.  */

#ifdef FIX_ADDRESS
#define DATA_SEG_BITS 0xef000000
#endif

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

#ifndef m88k
#define m88k
#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

/* 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) */

/* 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.  */

/* #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 alloca(x) __builtin_alloca(x)

/* 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

/* Use 26 bits instead of 24 for internal pointer values */

#define VALBITS 26
#define GCTYPEBITS 5

/* Define ADDR_CORRECT(ADDR) to be a macro to correct an int which is
   the bit pattern of a pointer to a byte into an int which is the
   number of a byte.

   This macro has a default definition which is usually right.
   This default definition is a no-op on most machines (where a
   pointer looks like an int) but not on all machines. */

#define	ADDR_CORRECT(ADDR) ((int)ADDR)

/* Cast pointers to this type to compare them. */

#define	PNTR_COMPARISON_TYPE	void *

/* Some machines that use COFF executables require that each section
   start on a certain boundary *in the COFF file*.  Such machines should
   define SECTION_ALIGNMENT to a mask of the low-order bits that must be
   zero on such a boundary.  This mask is used to control padding between
   segments in the COFF file.

   If SECTION_ALIGNMENT is not defined, the segments are written
   consecutively with no attempt at alignment.  This is right for
   unmodified system V.  */

#define SECTION_ALIGNMENT 0x7
Commit	Line	Data
20c428fd JB	1	/* machine description file for Data General AViiON.
	2	Copyright (C) 1985, 1986, 1991 Free Software Foundation, Inc.
	3
	4	This file is part of GNU Emacs.
	5
	6	GNU Emacs is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 1, or (at your option)
	9	any later version.
	10
	11	GNU Emacs is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
	17	along with GNU Emacs; see the file COPYING. If not, write to
	18	the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
	19
	20
	21	/* The following three symbols give information on
	22	the size of various data types. */
	23
	24	#define SHORTBITS 16 /* Number of bits in a short */
	25
	26	#define INTBITS 32 /* Number of bits in an int */
	27
	28	#define LONGBITS 32 /* Number of bits in a long */
	29
	30	/* Define BIG_ENDIAN iff lowest-numbered byte in a word
	31	is the most significant byte. */
	32
	33	#define BIG_ENDIAN
	34
	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	/* Define DATA_SEG_BITS if pointers need to be corrected with
	46	a segment field. */
	47
	48	#ifdef FIX_ADDRESS
	49	#define DATA_SEG_BITS 0xef000000
	50	#endif
	51
	52	/* Now define a symbol for the cpu type, if your compiler
	53	does not define it automatically:
	54	Ones defined so far include vax, m68000, ns16000, pyramid,
	55	orion, tahoe, APOLLO and many others */
	56
	57	#ifndef m88k
	58	#define m88k
	59	#endif
	60
	61	/* Use type int rather than a union, to represent Lisp_Object */
	62	/* This is desirable for most machines. */
	63
	64	#define NO_UNION_TYPE
	65
	66	/* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
	67	the 24-bit bit field into an int. In other words, if bit fields
	68	are always unsigned.
	69
	70	If you use NO_UNION_TYPE, this flag does not matter. */
	71
	72	#define EXPLICIT_SIGN_EXTEND
	73
	74	/* Data type of load average, as read out of kmem. */
	75
	76	/* #define LOAD_AVE_TYPE long */
	77
	78	/* Convert that into an integer that is 100 for a load average of 1.0 */
	79
	80	/* #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE) */
	81
	82	/* Define CANNOT_DUMP on machines where unexec does not work.
	83	Then the function dump-emacs will not be defined
	84	and temacs will do (load "loadup") automatically unless told otherwise. */
	85
	86	/* #define CANNOT_DUMP */
	87
	88	/* Define VIRT_ADDR_VARIES if the virtual addresses of
	89	pure and impure space as loaded can vary, and even their
	90	relative order cannot be relied on.
	91
	92	Otherwise Emacs assumes that text space precedes data space,
	93	numerically. */
	94
	95	/* #define VIRT_ADDR_VARIES */
	96
	97	/* Define C_ALLOCA if this machine does not support a true alloca
	98	and the one written in C should be used instead.
	99	Define HAVE_ALLOCA to say that the system provides a properly
	100	working alloca function and it should be used.
	101	Define neither one if an assembler-language alloca
	102	in the file alloca.s should be used. */
	103
	104	/* #define C_ALLOCA */
	105	#define HAVE_ALLOCA
	106	#define alloca(x) __builtin_alloca(x)
	107
	108	/* Define NO_REMAP if memory segmentation makes it not work well
109	to change the boundary between the text section and data section
110	when Emacs is dumped. If you define this, the preloaded Lisp
111	code will not be sharable; but that's better than failing completely. */
112
113	#define NO_REMAP
114
115	/* Use 26 bits instead of 24 for internal pointer values */
116
117	#define VALBITS 26
118	#define GCTYPEBITS 5
119
120	/* Define ADDR_CORRECT(ADDR) to be a macro to correct an int which is
121	the bit pattern of a pointer to a byte into an int which is the
122	number of a byte.
123
124	This macro has a default definition which is usually right.
125	This default definition is a no-op on most machines (where a
126	pointer looks like an int) but not on all machines. */
127
128	#define ADDR_CORRECT(ADDR) ((int)ADDR)
129
130	/* Cast pointers to this type to compare them. */
131
132	#define PNTR_COMPARISON_TYPE void *
133
134	/* Some machines that use COFF executables require that each section
135	start on a certain boundary in the COFF file. Such machines should
136	define SECTION_ALIGNMENT to a mask of the low-order bits that must be
137	zero on such a boundary. This mask is used to control padding between
138	segments in the COFF file.
139
140	If SECTION_ALIGNMENT is not defined, the segments are written
141	consecutively with no attempt at alignment. This is right for
142	unmodified system V. */
143
144	#define SECTION_ALIGNMENT 0x7
145