xref: /freebsd/sys/arm/include/asm.h (revision 2a3e3873a1e4cd958f2b0f85d3b10cfa40575d30)
1 /*	$NetBSD: asm.h,v 1.5 2003/08/07 16:26:53 agc Exp $	*/
2 
3 /*-
4  * Copyright (c) 1990 The Regents of the University of California.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to Berkeley by
8  * William Jolitz.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  * 3. Neither the name of the University nor the names of its contributors
19  *    may be used to endorse or promote products derived from this software
20  *    without specific prior written permission.
21  *
22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32  * SUCH DAMAGE.
33  *
34  *	from: @(#)asm.h	5.5 (Berkeley) 5/7/91
35  *
36  * $FreeBSD$
37  */
38 
39 #ifndef _MACHINE_ASM_H_
40 #define _MACHINE_ASM_H_
41 #include <sys/cdefs.h>
42 
43 #define	_C_LABEL(x)	x
44 #define	_ASM_LABEL(x)	x
45 
46 #define I32_bit (1 << 7)	/* IRQ disable */
47 #define F32_bit (1 << 6)        /* FIQ disable */
48 
49 #define CPU_CONTROL_32BP_ENABLE 0x00000010 /* P: 32-bit exception handlers */
50 #define CPU_CONTROL_32BD_ENABLE 0x00000020 /* D: 32-bit addressing */
51 
52 #ifndef _ALIGN_TEXT
53 # define _ALIGN_TEXT .align 0
54 #endif
55 
56 #ifdef __ARM_EABI__
57 #define	STOP_UNWINDING	.cantunwind
58 #define	_FNSTART	.fnstart
59 #define	_FNEND		.fnend
60 #else
61 #define	STOP_UNWINDING
62 #define	_FNSTART
63 #define	_FNEND
64 #endif
65 
66 /*
67  * gas/arm uses @ as a single comment character and thus cannot be used here
68  * Instead it recognised the # instead of an @ symbols in .type directives
69  * We define a couple of macros so that assembly code will not be dependent
70  * on one or the other.
71  */
72 #define _ASM_TYPE_FUNCTION	#function
73 #define _ASM_TYPE_OBJECT	#object
74 #define GLOBAL(X) .globl x
75 #define _ENTRY(x) \
76 	.text; _ALIGN_TEXT; .globl x; .type x,_ASM_TYPE_FUNCTION; x: _FNSTART
77 
78 #define	_END(x)	.size x, . - x; _FNEND
79 
80 #ifdef GPROF
81 #  define _PROF_PROLOGUE	\
82 	mov ip, lr; bl __mcount
83 #else
84 # define _PROF_PROLOGUE
85 #endif
86 
87 #define	ENTRY(y)	_ENTRY(_C_LABEL(y)); _PROF_PROLOGUE
88 #define	ENTRY_NP(y)	_ENTRY(_C_LABEL(y))
89 #define	END(y)		_END(_C_LABEL(y))
90 #define	ASENTRY(y)	_ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
91 #define	ASENTRY_NP(y)	_ENTRY(_ASM_LABEL(y))
92 #define	ASEND(y)	_END(_ASM_LABEL(y))
93 
94 #define	ASMSTR		.asciz
95 
96 #if defined(PIC)
97 #define	PLT_SYM(x)	PIC_SYM(x, PLT)
98 #define	GOT_SYM(x)	PIC_SYM(x, GOT)
99 #define	GOT_GET(x,got,sym)	\
100 	ldr	x, sym;		\
101 	ldr	x, [x, got]
102 #define	GOT_INIT(got,gotsym,pclabel) \
103 	ldr	got, gotsym;	\
104 	add	got, got, pc;	\
105 	pclabel:
106 #define	GOT_INITSYM(gotsym,pclabel) \
107 	gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) + (. - (pclabel+4))
108 
109 #ifdef __STDC__
110 #define	PIC_SYM(x,y)	x ## ( ## y ## )
111 #else
112 #define	PIC_SYM(x,y)	x/**/(/**/y/**/)
113 #endif
114 
115 #else
116 #define	PLT_SYM(x)	x
117 #define	GOT_SYM(x)	x
118 #define	GOT_GET(x,got,sym)	\
119 	ldr	x, sym;
120 #define	GOT_INIT(got,gotsym,pclabel)
121 #define	GOT_INITSYM(gotsym,pclabel)
122 #define	PIC_SYM(x,y)	x
123 #endif	/* PIC */
124 
125 #undef __FBSDID
126 #if !defined(lint) && !defined(STRIP_FBSDID)
127 #define __FBSDID(s)     .ident s
128 #else
129 #define __FBSDID(s)     /* nothing */
130 #endif
131 
132 
133 #define	WEAK_ALIAS(alias,sym)						\
134 	.weak alias;							\
135 	alias = sym
136 
137 #ifdef __STDC__
138 #define	WARN_REFERENCES(sym,msg)					\
139 	.stabs msg ## ,30,0,0,0 ;					\
140 	.stabs __STRING(_C_LABEL(sym)) ## ,1,0,0,0
141 #else
142 #define	WARN_REFERENCES(sym,msg)					\
143 	.stabs msg,30,0,0,0 ;						\
144 	.stabs __STRING(sym),1,0,0,0
145 #endif /* __STDC__ */
146 
147 /* Exactly one of the __ARM_ARCH_*__ macros will be defined by the compiler. */
148 /* The _ARM_ARCH_* macros are deprecated and will be removed soon. */
149 /* This should be moved into another header so it can be used in
150  * both asm and C code. machine/asm.h cannot be included in C code. */
151 #if defined (__ARM_ARCH_7__) || defined (__ARM_ARCH_7A__)
152 #define _ARM_ARCH_7
153 #define _HAVE_ARMv7_INSTRUCTIONS 1
154 #endif
155 
156 #if defined (_HAVE_ARMv7_INSTRUCTIONS) || defined (__ARM_ARCH_6__) || \
157 	defined (__ARM_ARCH_6J__) || defined (__ARM_ARCH_6K__) || \
158 	defined (__ARM_ARCH_6Z__) || defined (__ARM_ARCH_6ZK__)
159 #define _ARM_ARCH_6
160 #define _HAVE_ARMv6_INSTRUCTIONS 1
161 #endif
162 
163 #if defined (_HAVE_ARMv6_INSTRUCTIONS) || defined (__ARM_ARCH_5TE__) || \
164     defined (__ARM_ARCH_5TEJ__) || defined (__ARM_ARCH_5E__)
165 #define _ARM_ARCH_5E
166 #define _HAVE_ARMv5E_INSTRUCTIONS 1
167 #endif
168 
169 #if defined (_HAVE_ARMv5E_INSTRUCTIONS) || defined (__ARM_ARCH_5__) || \
170     defined (__ARM_ARCH_5T__)
171 #define _ARM_ARCH_5
172 #define _HAVE_ARMv5_INSTRUCTIONS 1
173 #endif
174 
175 #if defined (_HAVE_ARMv5_INSTRUCTIONS) || defined (__ARM_ARCH_4T__)
176 #define _ARM_ARCH_4T
177 #define _HAVE_ARMv4T_INSTRUCTIONS 1
178 #endif
179 
180 /* FreeBSD requires ARMv4, so this is always set. */
181 #define _HAVE_ARMv4_INSTRUCTIONS 1
182 
183 #if defined (_HAVE_ARMv4T_INSTRUCTIONS)
184 # define RET	bx	lr
185 # define RETeq	bxeq	lr
186 # define RETne	bxne	lr
187 # define RETc(c) bx##c	lr
188 #else
189 # define RET	mov	pc, lr
190 # define RETeq	moveq	pc, lr
191 # define RETne	movne	pc, lr
192 # define RETc(c) mov##c	pc, lr
193 #endif
194 
195 #endif /* !_MACHINE_ASM_H_ */
196