FreeBSD/Linux Kernel Cross Reference
sys/arm/include/asm.h
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: releng/11.0/sys/arm/include/asm.h 300694 2016-05-25 19:44:26Z ian $
37 */
38
39 #ifndef _MACHINE_ASM_H_
40 #define _MACHINE_ASM_H_
41 #include <sys/cdefs.h>
42 #include <machine/sysreg.h>
43
44 #define _C_LABEL(x) x
45 #define _ASM_LABEL(x) x
46
47 #ifndef _ALIGN_TEXT
48 # define _ALIGN_TEXT .align 2
49 #endif
50
51 #ifndef _STANDALONE
52 #define STOP_UNWINDING .cantunwind
53 #define _FNSTART .fnstart
54 #define _FNEND .fnend
55 #define _SAVE(...) .save __VA_ARGS__
56 #else
57 #define STOP_UNWINDING
58 #define _FNSTART
59 #define _FNEND
60 #define _SAVE(...)
61 #endif
62
63 /*
64 * gas/arm uses @ as a single comment character and thus cannot be used here.
65 * It recognises the # instead of an @ symbol in .type directives.
66 */
67 #define _ASM_TYPE_FUNCTION #function
68 #define _ASM_TYPE_OBJECT #object
69
70 /* XXX Is this still the right prologue for profiling? */
71 #ifdef GPROF
72 #define _PROF_PROLOGUE \
73 mov ip, lr; \
74 bl __mcount
75 #else
76 #define _PROF_PROLOGUE
77 #endif
78
79 /*
80 * EENTRY()/EEND() mark "extra" entry/exit points from a function.
81 * LEENTRY()/LEEND() are the same for local symbols.
82 * The unwind info cannot handle the concept of a nested function, or a function
83 * with multiple .fnstart directives, but some of our assembler code is written
84 * with multiple labels to allow entry at several points. The EENTRY() macro
85 * defines such an extra entry point without a new .fnstart, so that it's
86 * basically just a label that you can jump to. The EEND() macro does nothing
87 * at all, except document the exit point associated with the same-named entry.
88 */
89 #define GLOBAL(x) .global x
90
91 #ifdef __thumb__
92 #define _FUNC_MODE .code 16; .thumb_func
93 #else
94 #define _FUNC_MODE .code 32
95 #endif
96
97 #define _LEENTRY(x) .type x,_ASM_TYPE_FUNCTION; _FUNC_MODE; x:
98 #define _LEEND(x) /* nothing */
99 #define _EENTRY(x) GLOBAL(x); _LEENTRY(x)
100 #define _EEND(x) _LEEND(x)
101
102 #define _LENTRY(x) .text; _ALIGN_TEXT; _LEENTRY(x); _FNSTART
103 #define _LEND(x) .size x, . - x; _FNEND
104 #define _ENTRY(x) .text; _ALIGN_TEXT; _EENTRY(x); _FNSTART
105 #define _END(x) _LEND(x)
106
107 #define ENTRY(y) _ENTRY(_C_LABEL(y)); _PROF_PROLOGUE
108 #define EENTRY(y) _EENTRY(_C_LABEL(y));
109 #define ENTRY_NP(y) _ENTRY(_C_LABEL(y))
110 #define EENTRY_NP(y) _EENTRY(_C_LABEL(y))
111 #define END(y) _END(_C_LABEL(y))
112 #define EEND(y) _EEND(_C_LABEL(y))
113 #define ASENTRY(y) _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
114 #define ASLENTRY(y) _LENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
115 #define ASEENTRY(y) _EENTRY(_ASM_LABEL(y));
116 #define ASLEENTRY(y) _LEENTRY(_ASM_LABEL(y));
117 #define ASENTRY_NP(y) _ENTRY(_ASM_LABEL(y))
118 #define ASLENTRY_NP(y) _LENTRY(_ASM_LABEL(y))
119 #define ASEENTRY_NP(y) _EENTRY(_ASM_LABEL(y))
120 #define ASLEENTRY_NP(y) _LEENTRY(_ASM_LABEL(y))
121 #define ASEND(y) _END(_ASM_LABEL(y))
122 #define ASLEND(y) _LEND(_ASM_LABEL(y))
123 #define ASEEND(y) _EEND(_ASM_LABEL(y))
124 #define ASLEEND(y) _LEEND(_ASM_LABEL(y))
125
126 #define ASMSTR .asciz
127
128 #if defined(PIC)
129 #define PLT_SYM(x) PIC_SYM(x, PLT)
130 #define GOT_SYM(x) PIC_SYM(x, GOT)
131 #define GOT_GET(x,got,sym) \
132 ldr x, sym; \
133 ldr x, [x, got]
134 #define GOT_INIT(got,gotsym,pclabel) \
135 ldr got, gotsym; \
136 pclabel: add got, pc
137 #ifdef __thumb__
138 #define GOT_INITSYM(gotsym,pclabel) \
139 .align 2; \
140 gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+4)
141 #else
142 #define GOT_INITSYM(gotsym,pclabel) \
143 .align 2; \
144 gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+8)
145 #endif
146
147 #ifdef __STDC__
148 #define PIC_SYM(x,y) x ## ( ## y ## )
149 #else
150 #define PIC_SYM(x,y) x/**/(/**/y/**/)
151 #endif
152
153 #else
154 #define PLT_SYM(x) x
155 #define GOT_SYM(x) x
156 #define GOT_GET(x,got,sym) \
157 ldr x, sym;
158 #define GOT_INIT(got,gotsym,pclabel)
159 #define GOT_INITSYM(gotsym,pclabel)
160 #define PIC_SYM(x,y) x
161 #endif /* PIC */
162
163 #undef __FBSDID
164 #if !defined(lint) && !defined(STRIP_FBSDID)
165 #define __FBSDID(s) .ident s
166 #else
167 #define __FBSDID(s) /* nothing */
168 #endif
169
170
171 #define WEAK_ALIAS(alias,sym) \
172 .weak alias; \
173 alias = sym
174
175 #ifdef __STDC__
176 #define WARN_REFERENCES(sym,msg) \
177 .stabs msg ## ,30,0,0,0 ; \
178 .stabs __STRING(_C_LABEL(sym)) ## ,1,0,0,0
179 #else
180 #define WARN_REFERENCES(sym,msg) \
181 .stabs msg,30,0,0,0 ; \
182 .stabs __STRING(sym),1,0,0,0
183 #endif /* __STDC__ */
184
185 /* Exactly one of the __ARM_ARCH_*__ macros will be defined by the compiler. */
186 /* The _ARM_ARCH_* macros are deprecated and will be removed soon. */
187 /* This should be moved into another header so it can be used in
188 * both asm and C code. machine/asm.h cannot be included in C code. */
189 #if defined (__ARM_ARCH_7__) || defined (__ARM_ARCH_7A__)
190 #define _ARM_ARCH_7
191 #define _HAVE_ARMv7_INSTRUCTIONS 1
192 #endif
193
194 #if defined (_HAVE_ARMv7_INSTRUCTIONS) || defined (__ARM_ARCH_6__) || \
195 defined (__ARM_ARCH_6J__) || defined (__ARM_ARCH_6K__) || \
196 defined (__ARM_ARCH_6Z__) || defined (__ARM_ARCH_6ZK__)
197 #define _ARM_ARCH_6
198 #define _HAVE_ARMv6_INSTRUCTIONS 1
199 #endif
200
201 #if defined (_HAVE_ARMv6_INSTRUCTIONS) || defined (__ARM_ARCH_5TE__) || \
202 defined (__ARM_ARCH_5TEJ__) || defined (__ARM_ARCH_5E__)
203 #define _ARM_ARCH_5E
204 #define _HAVE_ARMv5E_INSTRUCTIONS 1
205 #endif
206
207 #if defined (_HAVE_ARMv5E_INSTRUCTIONS) || defined (__ARM_ARCH_5__) || \
208 defined (__ARM_ARCH_5T__)
209 #define _ARM_ARCH_5
210 #define _HAVE_ARMv5_INSTRUCTIONS 1
211 #endif
212
213 #if defined (_HAVE_ARMv5_INSTRUCTIONS) || defined (__ARM_ARCH_4T__)
214 #define _ARM_ARCH_4T
215 #define _HAVE_ARMv4T_INSTRUCTIONS 1
216 #endif
217
218 /* FreeBSD requires ARMv4, so this is always set. */
219 #define _HAVE_ARMv4_INSTRUCTIONS 1
220
221 #if defined (_HAVE_ARMv4T_INSTRUCTIONS)
222 # define RET bx lr
223 # define RETeq bxeq lr
224 # define RETne bxne lr
225 # define RETc(c) bx##c lr
226 #else
227 # define RET mov pc, lr
228 # define RETeq moveq pc, lr
229 # define RETne movne pc, lr
230 # define RETc(c) mov##c pc, lr
231 #endif
232
233 #if __ARM_ARCH >= 7
234 #define ISB isb
235 #define DSB dsb
236 #define DMB dmb
237 #define WFI wfi
238 #elif __ARM_ARCH == 6
239 #define ISB mcr CP15_CP15ISB
240 #define DSB mcr CP15_CP15DSB
241 #define DMB mcr CP15_CP15DMB
242 #define WFI mcr CP15_CP15WFI
243 #else
244 #define ISB mcr CP15_CP15ISB
245 #define DSB mcr CP15_CP15DSB /* DSB and DMB are the */
246 #define DMB mcr CP15_CP15DSB /* same prior to v6.*/
247 /* No form of WFI available on v4, define nothing to get an error on use. */
248 #endif
249
250 #endif /* !_MACHINE_ASM_H_ */
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