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 * 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 /* XXX Is this still the right prologue for profiling? */
73 #ifdef GPROF
74 #define _PROF_PROLOGUE \
75 mov ip, lr; \
76 bl __mcount
77 #else
78 #define _PROF_PROLOGUE
79 #endif
80
81 /*
82 * EENTRY()/EEND() mark "extra" entry/exit points from a function.
83 * LEENTRY()/LEEND() are the same for local symbols.
84 * The unwind info cannot handle the concept of a nested function, or a function
85 * with multiple .fnstart directives, but some of our assembler code is written
86 * with multiple labels to allow entry at several points. The EENTRY() macro
87 * defines such an extra entry point without a new .fnstart, so that it's
88 * basically just a label that you can jump to. The EEND() macro does nothing
89 * at all, except document the exit point associated with the same-named entry.
90 */
91 #define GLOBAL(x) .global x
92
93 #ifdef __thumb__
94 #define _FUNC_MODE .code 16; .thumb_func
95 #else
96 #define _FUNC_MODE .code 32
97 #endif
98
99 #define _LEENTRY(x) .type x,_ASM_TYPE_FUNCTION; _FUNC_MODE; x:
100 #define _LEEND(x) /* nothing */
101 #define _EENTRY(x) GLOBAL(x); _LEENTRY(x)
102 #define _EEND(x) _LEEND(x)
103
104 #define _LENTRY(x) .text; _ALIGN_TEXT; _LEENTRY(x); _FNSTART
105 #define _LEND(x) .size x, . - x; _FNEND
106 #define _ENTRY(x) .text; _ALIGN_TEXT; _EENTRY(x); _FNSTART
107 #define _END(x) _LEND(x)
108
109 #define ENTRY(y) _ENTRY(_C_LABEL(y)); _PROF_PROLOGUE
110 #define EENTRY(y) _EENTRY(_C_LABEL(y));
111 #define ENTRY_NP(y) _ENTRY(_C_LABEL(y))
112 #define EENTRY_NP(y) _EENTRY(_C_LABEL(y))
113 #define END(y) _END(_C_LABEL(y))
114 #define EEND(y) _EEND(_C_LABEL(y))
115 #define ASENTRY(y) _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
116 #define ASLENTRY(y) _LENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
117 #define ASEENTRY(y) _EENTRY(_ASM_LABEL(y));
118 #define ASLEENTRY(y) _LEENTRY(_ASM_LABEL(y));
119 #define ASENTRY_NP(y) _ENTRY(_ASM_LABEL(y))
120 #define ASLENTRY_NP(y) _LENTRY(_ASM_LABEL(y))
121 #define ASEENTRY_NP(y) _EENTRY(_ASM_LABEL(y))
122 #define ASLEENTRY_NP(y) _LEENTRY(_ASM_LABEL(y))
123 #define ASEND(y) _END(_ASM_LABEL(y))
124 #define ASLEND(y) _LEND(_ASM_LABEL(y))
125 #define ASEEND(y) _EEND(_ASM_LABEL(y))
126 #define ASLEEND(y) _LEEND(_ASM_LABEL(y))
127
128 #define ASMSTR .asciz
129
130 #if defined(PIC)
131 #define PLT_SYM(x) PIC_SYM(x, PLT)
132 #define GOT_SYM(x) PIC_SYM(x, GOT)
133 #define GOT_GET(x,got,sym) \
134 ldr x, sym; \
135 ldr x, [x, got]
136 #define GOT_INIT(got,gotsym,pclabel) \
137 ldr got, gotsym; \
138 pclabel: add got, pc
139 #ifdef __thumb__
140 #define GOT_INITSYM(gotsym,pclabel) \
141 .align 2; \
142 gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+4)
143 #else
144 #define GOT_INITSYM(gotsym,pclabel) \
145 .align 2; \
146 gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+8)
147 #endif
148
149 #ifdef __STDC__
150 #define PIC_SYM(x,y) x ## ( ## y ## )
151 #else
152 #define PIC_SYM(x,y) x/**/(/**/y/**/)
153 #endif
154
155 #else
156 #define PLT_SYM(x) x
157 #define GOT_SYM(x) x
158 #define GOT_GET(x,got,sym) \
159 ldr x, sym;
160 #define GOT_INIT(got,gotsym,pclabel)
161 #define GOT_INITSYM(gotsym,pclabel)
162 #define PIC_SYM(x,y) x
163 #endif /* PIC */
164
165 #undef __FBSDID
166 #if !defined(lint) && !defined(STRIP_FBSDID)
167 #define __FBSDID(s) .ident s
168 #else
169 #define __FBSDID(s) /* nothing */
170 #endif
171
172 #define WEAK_ALIAS(alias,sym) \
173 .weak alias; \
174 alias = sym
175
176 #ifdef __STDC__
177 #define WARN_REFERENCES(sym,msg) \
178 .stabs msg ## ,30,0,0,0 ; \
179 .stabs __STRING(_C_LABEL(sym)) ## ,1,0,0,0
180 #else
181 #define WARN_REFERENCES(sym,msg) \
182 .stabs msg,30,0,0,0 ; \
183 .stabs __STRING(sym),1,0,0,0
184 #endif /* __STDC__ */
185
186 /* Exactly one of the __ARM_ARCH_*__ macros will be defined by the compiler. */
187 /* The _ARM_ARCH_* macros are deprecated and will be removed soon. */
188 /* This should be moved into another header so it can be used in
189 * both asm and C code. machine/asm.h cannot be included in C code. */
190 #if defined (__ARM_ARCH_7__) || defined (__ARM_ARCH_7A__)
191 #define _ARM_ARCH_7
192 #define _HAVE_ARMv7_INSTRUCTIONS 1
193 #endif
194
195 #if defined (_HAVE_ARMv7_INSTRUCTIONS) || defined (__ARM_ARCH_6__) || \
196 defined (__ARM_ARCH_6J__) || defined (__ARM_ARCH_6K__) || \
197 defined (__ARM_ARCH_6KZ__) || \
198 defined (__ARM_ARCH_6Z__) || defined (__ARM_ARCH_6ZK__)
199 #define _ARM_ARCH_6
200 #define _HAVE_ARMv6_INSTRUCTIONS 1
201 #endif
202
203 #if defined (_HAVE_ARMv6_INSTRUCTIONS) || defined (__ARM_ARCH_5TE__) || \
204 defined (__ARM_ARCH_5TEJ__) || defined (__ARM_ARCH_5E__)
205 #define _ARM_ARCH_5E
206 #define _HAVE_ARMv5E_INSTRUCTIONS 1
207 #endif
208
209 #if defined (_HAVE_ARMv5E_INSTRUCTIONS) || defined (__ARM_ARCH_5__) || \
210 defined (__ARM_ARCH_5T__)
211 #define _ARM_ARCH_5
212 #define _HAVE_ARMv5_INSTRUCTIONS 1
213 #endif
214
215 #if defined (_HAVE_ARMv5_INSTRUCTIONS) || defined (__ARM_ARCH_4T__)
216 #define _ARM_ARCH_4T
217 #define _HAVE_ARMv4T_INSTRUCTIONS 1
218 #endif
219
220 /* FreeBSD requires ARMv4, so this is always set. */
221 #define _HAVE_ARMv4_INSTRUCTIONS 1
222
223 #if defined (_HAVE_ARMv4T_INSTRUCTIONS)
224 # define RET bx lr
225 # define RETeq bxeq lr
226 # define RETne bxne lr
227 # define RETc(c) bx##c lr
228 #else
229 # define RET mov pc, lr
230 # define RETeq moveq pc, lr
231 # define RETne movne pc, lr
232 # define RETc(c) mov##c pc, lr
233 #endif
234
235 #if __ARM_ARCH >= 7
236 #define ISB isb
237 #define DSB dsb
238 #define DMB dmb
239 #define WFI wfi
240
241 #if defined(__ARM_ARCH_7VE__) || defined(__clang__)
242 #define MSR_ELR_HYP(regnum) msr elr_hyp, lr
243 #define ERET eret
244 #else
245 #define MSR_ELR_HYP(regnum) .word (0xe12ef300 | regnum)
246 #define ERET .word 0xe160006e
247 #endif
248
249 #elif __ARM_ARCH == 6
250 #define ISB mcr CP15_CP15ISB
251 #define DSB mcr CP15_CP15DSB
252 #define DMB mcr CP15_CP15DMB
253 #define WFI mcr CP15_CP15WFI
254 #else
255 #define ISB mcr CP15_CP15ISB
256 #define DSB mcr CP15_CP15DSB /* DSB and DMB are the */
257 #define DMB mcr CP15_CP15DSB /* same prior to v6.*/
258 /* No form of WFI available on v4, define nothing to get an error on use. */
259 #endif
260
261 #endif /* !_MACHINE_ASM_H_ */
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