xref: /freebsd/sys/arm/include/asm.h (revision 9c067b844f85a224f0416e6eb46ba3ef82aec5c4)
1 /*	$NetBSD: asm.h,v 1.5 2003/08/07 16:26:53 agc Exp $	*/
2 
3 /*-
4  * SPDX-License-Identifier: BSD-3-Clause
5  *
6  * Copyright (c) 1990 The Regents of the University of California.
7  * All rights reserved.
8  *
9  * This code is derived from software contributed to Berkeley by
10  * William Jolitz.
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  * 1. Redistributions of source code must retain the above copyright
16  *    notice, this list of conditions and the following disclaimer.
17  * 2. Redistributions in binary form must reproduce the above copyright
18  *    notice, this list of conditions and the following disclaimer in the
19  *    documentation and/or other materials provided with the distribution.
20  * 3. Neither the name of the University nor the names of its contributors
21  *    may be used to endorse or promote products derived from this software
22  *    without specific prior written permission.
23  *
24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34  * SUCH DAMAGE.
35  *
36  *	from: @(#)asm.h	5.5 (Berkeley) 5/7/91
37  *
38  * $FreeBSD$
39  */
40 
41 #ifndef _MACHINE_ASM_H_
42 #define _MACHINE_ASM_H_
43 #include <sys/cdefs.h>
44 #include <machine/sysreg.h>
45 
46 #define	_C_LABEL(x)	x
47 #define	_ASM_LABEL(x)	x
48 
49 #ifndef _ALIGN_TEXT
50 # define _ALIGN_TEXT .align 2
51 #endif
52 
53 #ifndef _STANDALONE
54 #define	STOP_UNWINDING	.cantunwind
55 #define	_FNSTART	.fnstart
56 #define	_FNEND		.fnend
57 #define	_SAVE(...)	.save __VA_ARGS__
58 #else
59 #define	STOP_UNWINDING
60 #define	_FNSTART
61 #define	_FNEND
62 #define	_SAVE(...)
63 #endif
64 
65 /*
66  * gas/arm uses @ as a single comment character and thus cannot be used here.
67  * It recognises the # instead of an @ symbol in .type directives.
68  */
69 #define	_ASM_TYPE_FUNCTION	#function
70 #define	_ASM_TYPE_OBJECT	#object
71 
72 /*
73  * EENTRY()/EEND() mark "extra" entry/exit points from a function.
74  * LEENTRY()/LEEND() are the same for local symbols.
75  * The unwind info cannot handle the concept of a nested function, or a function
76  * with multiple .fnstart directives, but some of our assembler code is written
77  * with multiple labels to allow entry at several points.  The EENTRY() macro
78  * defines such an extra entry point without a new .fnstart, so that it's
79  * basically just a label that you can jump to.  The EEND() macro does nothing
80  * at all, except document the exit point associated with the same-named entry.
81  */
82 #define	GLOBAL(x)	.global x
83 
84 #ifdef __thumb__
85 #define	_FUNC_MODE	.code 16; .thumb_func
86 #else
87 #define	_FUNC_MODE	.code 32
88 #endif
89 
90 #define	_LEENTRY(x) 	.type x,_ASM_TYPE_FUNCTION; _FUNC_MODE; x:
91 #define	_LEEND(x)	/* nothing */
92 #define	_EENTRY(x) 	GLOBAL(x); _LEENTRY(x)
93 #define	_EEND(x)	_LEEND(x)
94 
95 #define	_LENTRY(x)	.text; _ALIGN_TEXT; _LEENTRY(x); _FNSTART
96 #define	_LEND(x)	.size x, . - x; _FNEND
97 #define	_ENTRY(x)	.text; _ALIGN_TEXT; _EENTRY(x); _FNSTART
98 #define	_END(x)		_LEND(x)
99 
100 #define	ENTRY(y)	_ENTRY(_C_LABEL(y));
101 #define	EENTRY(y)	_EENTRY(_C_LABEL(y));
102 #define	ENTRY_NP(y)	_ENTRY(_C_LABEL(y))
103 #define	EENTRY_NP(y)	_EENTRY(_C_LABEL(y))
104 #define	END(y)		_END(_C_LABEL(y))
105 #define	EEND(y)		_EEND(_C_LABEL(y))
106 #define	ASENTRY(y)	_ENTRY(_ASM_LABEL(y));
107 #define	ASLENTRY(y)	_LENTRY(_ASM_LABEL(y));
108 #define	ASEENTRY(y)	_EENTRY(_ASM_LABEL(y));
109 #define	ASLEENTRY(y)	_LEENTRY(_ASM_LABEL(y));
110 #define	ASENTRY_NP(y)	_ENTRY(_ASM_LABEL(y))
111 #define	ASLENTRY_NP(y)	_LENTRY(_ASM_LABEL(y))
112 #define	ASEENTRY_NP(y)	_EENTRY(_ASM_LABEL(y))
113 #define	ASLEENTRY_NP(y)	_LEENTRY(_ASM_LABEL(y))
114 #define	ASEND(y)	_END(_ASM_LABEL(y))
115 #define	ASLEND(y)	_LEND(_ASM_LABEL(y))
116 #define	ASEEND(y)	_EEND(_ASM_LABEL(y))
117 #define	ASLEEND(y)	_LEEND(_ASM_LABEL(y))
118 
119 #define	ASMSTR		.asciz
120 
121 #if defined(PIC)
122 #define	PLT_SYM(x)	PIC_SYM(x, PLT)
123 #define	GOT_SYM(x)	PIC_SYM(x, GOT)
124 #define	GOT_GET(x,got,sym)	\
125 	ldr	x, sym;		\
126 	ldr	x, [x, got]
127 #define	GOT_INIT(got,gotsym,pclabel) \
128 	ldr	got, gotsym;	\
129 	pclabel: add	got, pc
130 #ifdef __thumb__
131 #define	GOT_INITSYM(gotsym,pclabel) \
132 	.align 2;		\
133 	gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+4)
134 #else
135 #define	GOT_INITSYM(gotsym,pclabel) \
136 	.align 2;		\
137 	gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+8)
138 #endif
139 
140 #ifdef __STDC__
141 #define	PIC_SYM(x,y)	x ## ( ## y ## )
142 #else
143 #define	PIC_SYM(x,y)	x/**/(/**/y/**/)
144 #endif
145 
146 #else
147 #define	PLT_SYM(x)	x
148 #define	GOT_SYM(x)	x
149 #define	GOT_GET(x,got,sym)	\
150 	ldr	x, sym;
151 #define	GOT_INIT(got,gotsym,pclabel)
152 #define	GOT_INITSYM(gotsym,pclabel)
153 #define	PIC_SYM(x,y)	x
154 #endif	/* PIC */
155 
156 #undef __FBSDID
157 #if !defined(lint) && !defined(STRIP_FBSDID)
158 #define __FBSDID(s)     .ident s
159 #else
160 #define __FBSDID(s)     /* nothing */
161 #endif
162 
163 #define	WEAK_ALIAS(alias,sym)						\
164 	.weak alias;							\
165 	alias = sym
166 
167 #ifdef __STDC__
168 #define	WARN_REFERENCES(sym,msg)					\
169 	.stabs msg ## ,30,0,0,0 ;					\
170 	.stabs __STRING(_C_LABEL(sym)) ## ,1,0,0,0
171 #else
172 #define	WARN_REFERENCES(sym,msg)					\
173 	.stabs msg,30,0,0,0 ;						\
174 	.stabs __STRING(sym),1,0,0,0
175 #endif /* __STDC__ */
176 
177 # define RET	bx	lr
178 # define RETeq	bxeq	lr
179 # define RETne	bxne	lr
180 # define RETc(c) bx##c	lr
181 
182 #if __ARM_ARCH >= 7
183 #define ISB	isb
184 #define DSB	dsb
185 #define DMB	dmb
186 #define WFI	wfi
187 
188 #if defined(__ARM_ARCH_7VE__) || defined(__clang__)
189 #define	MSR_ELR_HYP(regnum)	msr	elr_hyp, lr
190 #define	ERET	eret
191 #else
192 #define MSR_ELR_HYP(regnum) .word (0xe12ef300 | regnum)
193 #define ERET .word 0xe160006e
194 #endif
195 
196 #elif __ARM_ARCH == 6
197 #define ISB	mcr CP15_CP15ISB
198 #define DSB	mcr CP15_CP15DSB
199 #define DMB	mcr CP15_CP15DMB
200 #define WFI	mcr CP15_CP15WFI
201 #endif
202 
203 #endif /* !_MACHINE_ASM_H_ */
204