asm.h revision 115084 
1/* $FreeBSD: head/sys/ia64/include/asm.h 115084 2003-05-16 21:26:42Z marcel $ */
2/* From: NetBSD: asm.h,v 1.18 1997/11/03 04:22:06 ross Exp */
3
4/*
5 * Copyright (c) 1991,1990,1989,1994,1995,1996 Carnegie Mellon University
6 * All Rights Reserved.
7 *
8 * Permission to use, copy, modify and distribute this software and its
9 * documentation is hereby granted, provided that both the copyright
10 * notice and this permission notice appear in all copies of the
11 * software, derivative works or modified versions, and any portions
12 * thereof, and that both notices appear in supporting documentation.
13 *
14 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
15 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
16 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
17 *
18 * Carnegie Mellon requests users of this software to return to
19 *
20 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
21 *  School of Computer Science
22 *  Carnegie Mellon University
23 *  Pittsburgh PA 15213-3890
24 *
25 * any improvements or extensions that they make and grant Carnegie Mellon
26 * the rights to redistribute these changes.
27 */
28
29/*
30 *	Assembly coding style
31 *
32 *	This file contains macros and register defines to
33 *	aid in writing more readable assembly code.
34 *	Some rules to make assembly code understandable by
35 *	a debugger are also noted.
36 */
37
38/*
39 * Macro to make a local label name.
40 */
41#define	LLABEL(name,num)	L ## name ## num
42
43/*
44 * MCOUNT
45 */
46
47#if !defined(GPROF) && !defined(PROF)
48#define MCOUNT	/* nothing */
49#else
50#define MCOUNT					\
51	br.call.sptk.many b7=_mcount
52#endif
53
54/*
55 * ENTRY
56 *	Declare a global leaf function.
57 *	A leaf function does not call other functions.
58 */
59#define	ENTRY(_name_, _n_args_)			\
60	.global	_name_;				\
61	.align	16;				\
62	.proc	_name_;				\
63_name_:;					\
64	.regstk	_n_args_, 0, 0, 0		\
65	MCOUNT
66
67#define	ENTRY_NOPROFILE(_name_, _n_args_)	\
68	.global	_name_;				\
69	.align	16;				\
70	.proc	_name_;				\
71_name_:;					\
72	.regstk	_n_args_, 0, 0, 0
73
74/*
75 * STATIC_ENTRY
76 *	Declare a local leaf function.
77 */
78#define STATIC_ENTRY(_name_, _n_args_)		\
79	.align	16;				\
80	.proc	_name_;				\
81_name_:;					\
82	.regstk	_n_args_, 0, 0, 0		\
83	MCOUNT
84/*
85 * XENTRY
86 *	Global alias for a leaf function, or alternate entry point
87 */
88#define	XENTRY(_name_)				\
89	.globl	_name_;				\
90_name_:
91
92/*
93 * STATIC_XENTRY
94 *	Local alias for a leaf function, or alternate entry point
95 */
96#define	STATIC_XENTRY(_name_)			\
97_name_:
98
99
100/*
101 * END
102 *	Function delimiter
103 */
104#define	END(_name_)						\
105	.endp	_name_
106
107
108/*
109 * EXPORT
110 *	Export a symbol
111 */
112#define	EXPORT(_name_)						\
113	.global	_name_;						\
114_name_:
115
116
117/*
118 * IMPORT
119 *	Make an external name visible, typecheck the size
120 */
121#define	IMPORT(_name_, _size_)					\
122	/* .extern	_name_,_size_ */
123
124
125/*
126 * ABS
127 *	Define an absolute symbol
128 */
129#define	ABS(_name_, _value_)					\
130	.globl	_name_;						\
131_name_	=	_value_
132
133
134/*
135 * BSS
136 *	Allocate un-initialized space for a global symbol
137 */
138#define	BSS(_name_,_numbytes_)					\
139	.comm	_name_,_numbytes_
140
141
142/*
143 * MSG
144 *	Allocate space for a message (a read-only ascii string)
145 */
146#define	ASCIZ	.asciz
147#define	MSG(msg,reg,label)			\
148	addl reg,@ltoff(label),gp;;		\
149	ld8 reg=[reg];;				\
150	.data;					\
151label:	ASCIZ msg;				\
152	.text;
153
154
155/*
156 * System call glue.
157 */
158#define	SYSCALLNUM(name)	SYS_ ## name
159
160#define	CALLSYS_NOERROR(name)					\
161{	.mmi ;							\
162	alloc		r9 = ar.pfs, 0, 0, 8, 0 ;		\
163	mov		r31 = ar.k5 ;				\
164	mov		r10 = b0 ;; }				\
165{	.mib ;							\
166	mov		r8 = SYSCALLNUM(name) ;			\
167	mov		b7 = r31 ; 				\
168	br.call.sptk	b0 = b7 ;; }
169
170
171/*
172 * WEAK_ALIAS: create a weak alias (ELF only).
173 */
174#define WEAK_ALIAS(alias,sym)					\
175	.weak alias;						\
176	alias = sym
177
178/*
179 * ID tag macros
180 */
181#if !defined(lint) && !defined(STRIP_FBSDID)
182#define __FBSDID(s)	.ident s
183#else
184#define __FBSDID(s)	/* nothing */
185#endif /* not lint and not STRIP_FBSDID */
186