1 /* $NetBSD: asm.h,v 1.5 2003/08/07 16:26:53 agc Exp $ */
4 * SPDX-License-Identifier: BSD-3-Clause
6 * Copyright (c) 1990 The Regents of the University of California.
9 * This code is derived from software contributed to Berkeley by
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36 * from: @(#)asm.h 5.5 (Berkeley) 5/7/91
41 #ifndef _MACHINE_ASM_H_
42 #define _MACHINE_ASM_H_
43 #include <sys/cdefs.h>
46 #define _ASM_LABEL(x) x
49 # define _ALIGN_TEXT .align 2
53 #define STOP_UNWINDING .cantunwind
54 #define _FNSTART .fnstart
56 #define _SAVE(...) .save __VA_ARGS__
58 #define STOP_UNWINDING
65 * gas/arm uses @ as a single comment character and thus cannot be used here.
66 * It recognises the # instead of an @ symbol in .type directives.
68 #define _ASM_TYPE_FUNCTION #function
69 #define _ASM_TYPE_OBJECT #object
72 * EENTRY()/EEND() mark "extra" entry/exit points from a function.
73 * LEENTRY()/LEEND() are the same for local symbols.
74 * The unwind info cannot handle the concept of a nested function, or a function
75 * with multiple .fnstart directives, but some of our assembler code is written
76 * with multiple labels to allow entry at several points. The EENTRY() macro
77 * defines such an extra entry point without a new .fnstart, so that it's
78 * basically just a label that you can jump to. The EEND() macro does nothing
79 * at all, except document the exit point associated with the same-named entry.
81 #define GLOBAL(x) .global x
84 #define _FUNC_MODE .code 16; .thumb_func
86 #define _FUNC_MODE .code 32
89 #define _LEENTRY(x) .type x,_ASM_TYPE_FUNCTION; _FUNC_MODE; x:
90 #define _LEEND(x) /* nothing */
91 #define _EENTRY(x) GLOBAL(x); _LEENTRY(x)
92 #define _EEND(x) _LEEND(x)
94 #define _LENTRY(x) .text; _ALIGN_TEXT; _LEENTRY(x); _FNSTART
95 #define _LEND(x) .size x, . - x; _FNEND
96 #define _ENTRY(x) .text; _ALIGN_TEXT; _EENTRY(x); _FNSTART
97 #define _END(x) _LEND(x)
99 #define ENTRY(y) _ENTRY(_C_LABEL(y));
100 #define EENTRY(y) _EENTRY(_C_LABEL(y));
101 #define ENTRY_NP(y) _ENTRY(_C_LABEL(y))
102 #define EENTRY_NP(y) _EENTRY(_C_LABEL(y))
103 #define END(y) _END(_C_LABEL(y))
104 #define EEND(y) _EEND(_C_LABEL(y))
105 #define ASENTRY(y) _ENTRY(_ASM_LABEL(y));
106 #define ASLENTRY(y) _LENTRY(_ASM_LABEL(y));
107 #define ASEENTRY(y) _EENTRY(_ASM_LABEL(y));
108 #define ASLEENTRY(y) _LEENTRY(_ASM_LABEL(y));
109 #define ASENTRY_NP(y) _ENTRY(_ASM_LABEL(y))
110 #define ASLENTRY_NP(y) _LENTRY(_ASM_LABEL(y))
111 #define ASEENTRY_NP(y) _EENTRY(_ASM_LABEL(y))
112 #define ASLEENTRY_NP(y) _LEENTRY(_ASM_LABEL(y))
113 #define ASEND(y) _END(_ASM_LABEL(y))
114 #define ASLEND(y) _LEND(_ASM_LABEL(y))
115 #define ASEEND(y) _EEND(_ASM_LABEL(y))
116 #define ASLEEND(y) _LEEND(_ASM_LABEL(y))
118 #define ASMSTR .asciz
121 #define PLT_SYM(x) PIC_SYM(x, PLT)
122 #define GOT_SYM(x) PIC_SYM(x, GOT)
123 #define GOT_GET(x,got,sym) \
126 #define GOT_INIT(got,gotsym,pclabel) \
130 #define GOT_INITSYM(gotsym,pclabel) \
132 gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+4)
134 #define GOT_INITSYM(gotsym,pclabel) \
136 gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+8)
140 #define PIC_SYM(x,y) x ## ( ## y ## )
142 #define PIC_SYM(x,y) x/**/(/**/y/**/)
148 #define GOT_GET(x,got,sym) \
150 #define GOT_INIT(got,gotsym,pclabel)
151 #define GOT_INITSYM(gotsym,pclabel)
152 #define PIC_SYM(x,y) x
156 #if !defined(lint) && !defined(STRIP_FBSDID)
157 #define __FBSDID(s) .ident s
159 #define __FBSDID(s) /* nothing */
162 #define WEAK_ALIAS(alias,sym) \
167 #define WARN_REFERENCES(sym,msg) \
168 .stabs msg ## ,30,0,0,0 ; \
169 .stabs __STRING(_C_LABEL(sym)) ## ,1,0,0,0
171 #define WARN_REFERENCES(sym,msg) \
172 .stabs msg,30,0,0,0 ; \
173 .stabs __STRING(sym),1,0,0,0
174 #endif /* __STDC__ */
177 # define RETeq bxeq lr
178 # define RETne bxne lr
179 # define RETc(c) bx##c lr
187 #if defined(__ARM_ARCH_7VE__) || defined(__clang__)
188 #define MSR_ELR_HYP(regnum) msr elr_hyp, lr
191 #define MSR_ELR_HYP(regnum) .word (0xe12ef300 | regnum)
192 #define ERET .word 0xe160006e
195 #elif __ARM_ARCH == 6
196 #include <machine/sysreg.h>
197 #define ISB mcr CP15_CP15ISB
198 #define DSB mcr CP15_CP15DSB
199 #define DMB mcr CP15_CP15DMB
200 #define WFI mcr CP15_CP15WFI
203 #endif /* !_MACHINE_ASM_H_ */