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asm.h revision 1.14 
      1 /*	$NetBSD: asm.h,v 1.14 1997/07/14 07:44:56 thorpej Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1997 Jason R. Thorpe.  All rights reserved.
      5  * Copyright (c) 1994 Allen Briggs
      6  * All rights reserved.
      7  *
      8  * Gleaned from locore.s and sun3 asm.h which had the following copyrights:
      9  * locore.s:
     10  * Copyright (c) 1988 University of Utah.
     11  * Copyright (c) 1982, 1990 The Regents of the University of California.
     12  * sun3/include/asm.h:
     13  * Copyright (c) 1993 Adam Glass
     14  * Copyright (c) 1990 The Regents of the University of California.
     15  *
     16  * Redistribution and use in source and binary forms, with or without
     17  * modification, are permitted provided that the following conditions
     18  * are met:
     19  * 1. Redistributions of source code must retain the above copyright
     20  *    notice, this list of conditions and the following disclaimer.
     21  * 2. Redistributions in binary form must reproduce the above copyright
     22  *    notice, this list of conditions and the following disclaimer in the
     23  *    documentation and/or other materials provided with the distribution.
     24  * 3. All advertising materials mentioning features or use of this software
     25  *    must display the following acknowledgement:
     26  *	This product includes software developed by the University of
     27  *	California, Berkeley and its contributors.
     28  * 4. Neither the name of the University nor the names of its contributors
     29  *    may be used to endorse or promote products derived from this software
     30  *    without specific prior written permission.
     31  *
     32  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     33  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     34  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     35  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     36  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     40  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     41  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     42  * SUCH DAMAGE.
     43  */
     44 
     45 #ifndef _ASM_H_
     46 #define _ASM_H_
     47 
     48 #ifdef __STDC__
     49 #define	_C_LABEL(name)		_ ## name
     50 #else
     51 #define	_C_LABEL(name)		_/**/name
     52 #endif /* __STDC__ */
     53 
     54 #define	_ASM_LABEL(name)	name
     55 
     56 #define	_ENTRY(name) \
     57 	.text; .even; .globl name; .type name,@function; name:
     58 
     59 #ifdef GPROF
     60 #define _PROF_PROLOG	link a6,#0; jbsr mcount; unlk a6
     61 #else
     62 #define _PROF_PROLOG
     63 #endif
     64 
     65 #define ENTRY(name)		_ENTRY(_C_LABEL(name)) _PROF_PROLOG
     66 #define	ASENTRY(name)		_ENTRY(_ASM_LABEL(name)) _PROF_PROLOG
     67 
     68 #define	ENTRY_NOPROFILE(name)	_ENTRY(_C_LABEL(name))
     69 #define	ASENTRY_NOPROFILE(name)	_ENTRY(_ASM_LABEL(name))
     70 
     71 /*
     72  * The m68k ALTENTRY macro is very different than the traditional
     73  * implementation used by other NetBSD ports.  Usually ALTENTRY
     74  * simply provides an alternate function entry point.  The m68k
     75  * definition takes a second argument and jumps inside the second
     76  * function when profiling is enabled.
     77  *
     78  * The m68k behavior is similar to the ENTRY2 macro found in
     79  * solaris' asm_linkage.h.
     80  *
     81  * Providing ENTRY2 and changing all the code that uses ALTENTRY
     82  * to use it would be a desirable change.
     83  */
     84 #ifdef PROF
     85 #define ALTENTRY(name, rname)	ENTRY(name); jra rname+12
     86 #else
     87 #define ALTENTRY(name, rname)	_ENTRY(_C_LABEL(name))
     88 #endif
     89 
     90 #define RCSID(x)	.text			;	\
     91 			.asciz x		;	\
     92 			.even
     93 
     94 /*
     95  * Global variables of whatever sort.
     96  */
     97 #define	GLOBAL(x)					\
     98 		.globl	_C_LABEL(x)		;	\
     99 	_C_LABEL(x):
    100 
    101 #define	ASGLOBAL(x)					\
    102 		.globl	_ASM_LABEL(x)		;	\
    103 	_ASM_LABEL(x):
    104 
    105 /*
    106  * ...and local variables.
    107  */
    108 #define	LOCAL(x)					\
    109 	_C_LABEL(x):
    110 
    111 #define	ASLOCAL(x)					\
    112 	_ASM_LABEL(x):
    113 
    114 /*
    115  * Items in the BSS segment.
    116  */
    117 #define	BSS(name, size)					\
    118 	.comm	_C_LABEL(name),size
    119 
    120 #define	ASBSS(name, size)				\
    121 	.comm	_ASM_LABEL(name),size
    122 
    123 #ifdef _KERNEL
    124 /*
    125  * Shorthand for calling panic().
    126  * Note the side-effect: it uses up the 9: label, so be careful!
    127  */
    128 #define	PANIC(x)					\
    129 		pea	9f			;	\
    130 		jbsr	_C_LABEL(panic)		;	\
    131 	9:	.asciz	x			;	\
    132 		.even
    133 
    134 /*
    135  * Shorthand for defining vectors for the vector table.
    136  */
    137 #define	VECTOR(x)					\
    138 	.long	_C_LABEL(x)
    139 
    140 #define	ASVECTOR(x)					\
    141 	.long	_ASM_LABEL(x)
    142 
    143 #define	VECTOR_UNUSED					\
    144 	.long	0
    145 
    146 #endif /* _KERNEL */
    147 
    148 #endif /* _ASM_H_ */
    149