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asm.h revision 1.10 
      1 /*	$NetBSD: asm.h,v 1.10 2000/06/23 12:18:50 kleink 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 __arch64__
     48 #ifndef __ELF__
     49 #define __ELF__
     50 #endif
     51 #endif
     52 
     53 #ifdef __ELF__
     54 #define	_C_LABEL(name)		name
     55 #else
     56 #ifdef __STDC__
     57 #define _C_LABEL(name)		_ ## name
     58 #else
     59 #define _C_LABEL(name)		_/**/name
     60 #endif
     61 #endif
     62 #define	_ASM_LABEL(name)	name
     63 
     64 #ifdef PIC
     65 /*
     66  * PIC_PROLOGUE() is akin to the compiler generated function prologue for
     67  * PIC code. It leaves the address of the Global Offset Table in DEST,
     68  * clobbering register TMP in the process. Using the temporary enables us
     69  * to work without a stack frame (doing so requires saving %o7) .
     70  */
     71 #define PIC_PROLOGUE(dest,tmp) \
     72 	3: rd %pc, tmp; \
     73 	sethi %hi(_C_LABEL(_GLOBAL_OFFSET_TABLE_)-(3b-.)),dest; \
     74 	or dest,%lo(_C_LABEL(_GLOBAL_OFFSET_TABLE_)-(3b-.)),dest; \
     75 	add tmp,%o7,dest
     76 
     77 /*
     78  * PICCY_SET() does the equivalent of a `set var, %dest' instruction in
     79  * a PIC-like way, but without involving the Global Offset Table. This
     80  * only works for VARs defined in the same file *and* in the text segment.
     81  */
     82 #define PICCY_SET(var,dest,tmp) \
     83 	3: rd %pc, tmp; add tmp,(var-3b),dest
     84 #else
     85 #define PIC_PROLOGUE(dest,tmp)
     86 #define PICCY_OFFSET(var,dest,tmp)
     87 #endif
     88 
     89 #define FTYPE(x)		.type x,@function
     90 #define OTYPE(x)		.type x,@object
     91 
     92 #define	_ENTRY(name) \
     93 	.align 4; .globl name; .proc 1; FTYPE(name); name:
     94 
     95 #ifdef GPROF
     96 #define _PROF_PROLOGUE \
     97 	.data; .align 4; 1: .long 0; \
     98 	.text; save %sp,-96,%sp; sethi %hi(1b),%o0; call mcount; \
     99 	or %o0,%lo(1b),%o0; restore
    100 #else
    101 #define _PROF_PROLOGUE
    102 #endif
    103 
    104 #define ENTRY(name)		_ENTRY(_C_LABEL(name)); _PROF_PROLOGUE
    105 #define	ASENTRY(name)		_ENTRY(_ASM_LABEL(name)); _PROF_PROLOGUE
    106 #define	FUNC(name)		ASENTRY(name)
    107 #define RODATA(name)		.align 4; .text; .globl _C_LABEL(name); \
    108 				OTYPE(_C_LABEL(name)); _C_LABEL(name):
    109 
    110 
    111 #define ASMSTR			.asciz
    112 
    113 #define RCSID(name)		.asciz name
    114 
    115 #ifdef __ELF__
    116 #define	WEAK_ALIAS(alias,sym)						\
    117 	.weak alias;							\
    118 	alias = sym
    119 #endif
    120 
    121 /*
    122  * WARN_REFERENCES: create a warning if the specified symbol is referenced.
    123  */
    124 #ifdef __ELF__
    125 #ifdef __STDC__
    126 #define	WARN_REFERENCES(_sym,_msg)				\
    127 	.section .gnu.warning. ## _sym ; .ascii _msg ; .text
    128 #else
    129 #define	WARN_REFERENCES(_sym,_msg)				\
    130 	.section .gnu.warning./**/_sym ; .ascii _msg ; .text
    131 #endif /* __STDC__ */
    132 #else
    133 #ifdef __STDC__
    134 #define	__STRING(x)			#x
    135 #define	WARN_REFERENCES(sym,msg)					\
    136 	.stabs msg ## ,30,0,0,0 ;					\
    137 	.stabs __STRING(_ ## sym) ## ,1,0,0,0
    138 #else
    139 #define	__STRING(x)			"x"
    140 #define	WARN_REFERENCES(sym,msg)					\
    141 	.stabs msg,30,0,0,0 ;						\
    142 	.stabs __STRING(_/**/sym),1,0,0,0
    143 #endif /* __STDC__ */
    144 #endif /* __ELF__ */
    145 
    146 #endif /* _ASM_H_ */
    147