xref: /netbsd-src/sys/arch/sparc/include/asm.h (revision 3b01aba77a7a698587faaae455bbfe740923c1f5)
1 /*	$NetBSD: asm.h,v 1.11 2000/06/23 12:18:49 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 __ELF__
48 #define	_C_LABEL(name)		name
49 #else
50 #ifdef __STDC__
51 #define _C_LABEL(name)		_ ## name
52 #else
53 #define _C_LABEL(name)		_/**/name
54 #endif
55 #endif
56 #define	_ASM_LABEL(name)	name
57 
58 #ifdef PIC
59 /*
60  * PIC_PROLOGUE() is akin to the compiler generated function prologue for
61  * PIC code. It leaves the address of the Global Offset Table in DEST,
62  * clobbering register TMP in the process. Using the temporary enables us
63  * to work without a stack frame (doing so requires saving %o7) .
64  */
65 #define PIC_PROLOGUE(dest,tmp) \
66 	mov %o7,tmp; 3: call 4f; nop; 4: \
67 	sethi %hi(_C_LABEL(_GLOBAL_OFFSET_TABLE_)-(3b-.)),dest; \
68 	or dest,%lo(_C_LABEL(_GLOBAL_OFFSET_TABLE_)-(3b-.)),dest; \
69 	add dest,%o7,dest; mov tmp,%o7
70 
71 /*
72  * PICCY_SET() does the equivalent of a `set var, %dest' instruction in
73  * a PIC-like way, but without involving the Global Offset Table. This
74  * only works for VARs defined in the same file *and* in the text segment.
75  */
76 #define PICCY_SET(var,dest,tmp) \
77 	mov %o7,tmp; 3: call 4f; nop; 4: \
78 	add %o7,(var-3b),dest; mov tmp,%o7
79 #else
80 #define PIC_PROLOGUE(dest,tmp)
81 #define PICCY_OFFSET(var,dest,tmp)
82 #endif
83 
84 #define FTYPE(x)		.type x,@function
85 #define OTYPE(x)		.type x,@object
86 
87 #define	_ENTRY(name) \
88 	.align 4; .globl name; .proc 1; FTYPE(name); name:
89 
90 #ifdef GPROF
91 #define _PROF_PROLOGUE \
92 	.data; .align 4; 1: .long 0; \
93 	.text; save %sp,-96,%sp; sethi %hi(1b),%o0; call mcount; \
94 	or %o0,%lo(1b),%o0; restore
95 #else
96 #define _PROF_PROLOGUE
97 #endif
98 
99 #define ENTRY(name)		_ENTRY(_C_LABEL(name)); _PROF_PROLOGUE
100 #define	ASENTRY(name)		_ENTRY(_ASM_LABEL(name)); _PROF_PROLOGUE
101 #define	FUNC(name)		ASENTRY(name)
102 #define RODATA(name)		.align 4; .text; .globl _C_LABEL(name); \
103 				OTYPE(_C_LABEL(name)); _C_LABEL(name):
104 
105 
106 #define ASMSTR			.asciz
107 
108 #define RCSID(name)		.asciz name
109 
110 #ifdef __ELF__
111 #define	WEAK_ALIAS(alias,sym)						\
112 	.weak alias;							\
113 	alias = sym
114 #endif
115 
116 #ifdef __STDC__
117 #define	__STRING(x)			#x
118 #define	WARN_REFERENCES(sym,msg)					\
119 	.stabs msg ## ,30,0,0,0 ;					\
120 	.stabs __STRING(_ ## sym) ## ,1,0,0,0
121 #else
122 #define	__STRING(x)			"x"
123 #define	WARN_REFERENCES(sym,msg)					\
124 	.stabs msg,30,0,0,0 ;						\
125 	.stabs __STRING(_/**/sym),1,0,0,0
126 #endif /* __STDC__ */
127 
128 #endif /* _ASM_H_ */
129