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asm.h revision 1.5 
      1 /*	$NetBSD: asm.h,v 1.5 1997/07/16 15:16:43 christos Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1994 Allen Briggs
      5  * All rights reserved.
      6  *
      7  * Gleaned from locore.s and sun3 asm.h which had the following copyrights:
      8  * locore.s:
      9  * Copyright (c) 1988 University of Utah.
     10  * Copyright (c) 1982, 1990 The Regents of the University of California.
     11  * sun3/include/asm.h:
     12  * Copyright (c) 1993 Adam Glass
     13  * Copyright (c) 1990 The Regents of the University of California.
     14  *
     15  * Redistribution and use in source and binary forms, with or without
     16  * modification, are permitted provided that the following conditions
     17  * are met:
     18  * 1. Redistributions of source code must retain the above copyright
     19  *    notice, this list of conditions and the following disclaimer.
     20  * 2. Redistributions in binary form must reproduce the above copyright
     21  *    notice, this list of conditions and the following disclaimer in the
     22  *    documentation and/or other materials provided with the distribution.
     23  * 3. All advertising materials mentioning features or use of this software
     24  *    must display the following acknowledgement:
     25  *	This product includes software developed by the University of
     26  *	California, Berkeley and its contributors.
     27  * 4. Neither the name of the University nor the names of its contributors
     28  *    may be used to endorse or promote products derived from this software
     29  *    without specific prior written permission.
     30  *
     31  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     32  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     33  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     34  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     35  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     39  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     40  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     41  * SUCH DAMAGE.
     42  */
     43 
     44 #ifndef _ASM_H_
     45 #define _ASM_H_
     46 
     47 #ifdef __STDC__
     48 #define _C_LABEL(name)		_ ## name
     49 #else
     50 #define _C_LABEL(name)		_/**/name
     51 #endif
     52 #define	_ASM_LABEL(name)	name
     53 
     54 #ifdef PIC
     55 /*
     56  * PIC_PROLOGUE() is akin to the compiler generated function prologue for
     57  * PIC code. It leaves the address of the Global Offset Table in DEST,
     58  * clobbering register TMP in the process. Using the temporary enables us
     59  * to work without a stack frame (doing so requires saving %o7) .
     60  */
     61 #define PIC_PROLOGUE(dest,tmp) \
     62 	mov %o7,tmp; 3: call 4f; nop; 4: \
     63 	sethi %hi(__GLOBAL_OFFSET_TABLE_-(3b-.)),dest; \
     64 	or dest,%lo(__GLOBAL_OFFSET_TABLE_-(3b-.)),dest; \
     65 	add dest,%o7,dest; mov tmp,%o7
     66 
     67 /*
     68  * PICCY_SET() does the equivalent of a `set var, %dest' instruction in
     69  * a PIC-like way, but without involving the Global Offset Table. This
     70  * only works for VARs defined in the same file *and* in the text segment.
     71  */
     72 #define PICCY_SET(var,dest,tmp) \
     73 	mov %o7,tmp; 3: call 4f; nop; 4: \
     74 	add %o7,(var-3b),dest; mov tmp,%o7
     75 #else
     76 #define PIC_PROLOGUE(dest,tmp)
     77 #define PICCY_OFFSET(var,dest,tmp)
     78 #endif
     79 
     80 #define FTYPE(x)		.type x,@function
     81 #define OTYPE(x)		.type x,@object
     82 
     83 #define	_ENTRY(name) \
     84 	.align 4; .globl name; .proc 1; FTYPE(name); name:
     85 
     86 #ifdef GPROF
     87 #define _PROF_PROLOGUE \
     88 	.data; .align 4; 1: .long 0; \
     89 	.text; save %sp,-96,%sp; sethi %hi(1b),%o0; call mcount; \
     90 	or %o0,%lo(1b),%o0; restore
     91 #else
     92 #define _PROF_PROLOGUE
     93 #endif
     94 
     95 #define ENTRY(name)		_ENTRY(_C_LABEL(name)); _PROF_PROLOGUE
     96 #define	ASENTRY(name)		_ENTRY(_ASM_LABEL(name)); _PROF_PROLOGUE
     97 #define	FUNC(name)		ASENTRY(name)
     98 
     99 
    100 #define ASMSTR			.asciz
    101 
    102 #define RCSID(name)		.asciz name
    103 
    104 #endif /* _ASM_H_ */
    105