asm.h (6174B) - Raw
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 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 #ifndef _ALIGN_TEXT 47 # define _ALIGN_TEXT .align 2 48 #endif 49 50 #ifndef _STANDALONE 51 #define STOP_UNWINDING .cantunwind 52 #define _FNSTART .fnstart 53 #define _FNEND .fnend 54 #define _SAVE(...) .save __VA_ARGS__ 55 #else 56 #define STOP_UNWINDING 57 #define _FNSTART 58 #define _FNEND 59 #define _SAVE(...) 60 #endif 61 62 /* 63 * gas/arm uses @ as a single comment character and thus cannot be used here. 64 * It recognises the # instead of an @ symbol in .type directives. 65 */ 66 #define _ASM_TYPE_FUNCTION #function 67 #define _ASM_TYPE_OBJECT #object 68 69 /* 70 * EENTRY()/EEND() mark "extra" entry/exit points from a function. 71 * LEENTRY()/LEEND() are the same for local symbols. 72 * The unwind info cannot handle the concept of a nested function, or a function 73 * with multiple .fnstart directives, but some of our assembler code is written 74 * with multiple labels to allow entry at several points. The EENTRY() macro 75 * defines such an extra entry point without a new .fnstart, so that it's 76 * basically just a label that you can jump to. The EEND() macro does nothing 77 * at all, except document the exit point associated with the same-named entry. 78 */ 79 #define GLOBAL(x) .global x 80 81 #ifdef __thumb__ 82 #define _FUNC_MODE .code 16; .thumb_func 83 #else 84 #define _FUNC_MODE .code 32 85 #endif 86 87 #define _LEENTRY(x) .type x,_ASM_TYPE_FUNCTION; _FUNC_MODE; x: 88 #define _LEEND(x) /* nothing */ 89 #define _EENTRY(x) GLOBAL(x); _LEENTRY(x) 90 #define _EEND(x) _LEEND(x) 91 92 #define _LENTRY(x) .text; _ALIGN_TEXT; _LEENTRY(x); _FNSTART 93 #define _LEND(x) .size x, . - x; _FNEND 94 #define _ENTRY(x) .text; _ALIGN_TEXT; _EENTRY(x); _FNSTART 95 #define _END(x) _LEND(x) 96 97 #define ENTRY(y) _ENTRY(_C_LABEL(y)); 98 #define EENTRY(y) _EENTRY(_C_LABEL(y)); 99 #define ENTRY_NP(y) _ENTRY(_C_LABEL(y)) 100 #define EENTRY_NP(y) _EENTRY(_C_LABEL(y)) 101 #define END(y) _END(_C_LABEL(y)) 102 #define EEND(y) _EEND(_C_LABEL(y)) 103 #define ASENTRY(y) _ENTRY(_ASM_LABEL(y)); 104 #define ASLENTRY(y) _LENTRY(_ASM_LABEL(y)); 105 #define ASEENTRY(y) _EENTRY(_ASM_LABEL(y)); 106 #define ASLEENTRY(y) _LEENTRY(_ASM_LABEL(y)); 107 #define ASENTRY_NP(y) _ENTRY(_ASM_LABEL(y)) 108 #define ASLENTRY_NP(y) _LENTRY(_ASM_LABEL(y)) 109 #define ASEENTRY_NP(y) _EENTRY(_ASM_LABEL(y)) 110 #define ASLEENTRY_NP(y) _LEENTRY(_ASM_LABEL(y)) 111 #define ASEND(y) _END(_ASM_LABEL(y)) 112 #define ASLEND(y) _LEND(_ASM_LABEL(y)) 113 #define ASEEND(y) _EEND(_ASM_LABEL(y)) 114 #define ASLEEND(y) _LEEND(_ASM_LABEL(y)) 115 116 #define ASMSTR .asciz 117 118 #if defined(PIC) 119 #define PLT_SYM(x) PIC_SYM(x, PLT) 120 #define GOT_SYM(x) PIC_SYM(x, GOT) 121 #define GOT_GET(x,got,sym) \ 122 ldr x, sym; \ 123 ldr x, [x, got] 124 #define GOT_INIT(got,gotsym,pclabel) \ 125 ldr got, gotsym; \ 126 pclabel: add got, pc 127 #ifdef __thumb__ 128 #define GOT_INITSYM(gotsym,pclabel) \ 129 .align 2; \ 130 gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+4) 131 #else 132 #define GOT_INITSYM(gotsym,pclabel) \ 133 .align 2; \ 134 gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+8) 135 #endif 136 137 #ifdef __STDC__ 138 #define PIC_SYM(x,y) x ## ( ## y ## ) 139 #else 140 #define PIC_SYM(x,y) x/**/(/**/y/**/) 141 #endif 142 143 #else 144 #define PLT_SYM(x) x 145 #define GOT_SYM(x) x 146 #define GOT_GET(x,got,sym) \ 147 ldr x, sym; 148 #define GOT_INIT(got,gotsym,pclabel) 149 #define GOT_INITSYM(gotsym,pclabel) 150 #define PIC_SYM(x,y) x 151 #endif /* PIC */ 152 153 #undef __FBSDID 154 #if !defined(lint) && !defined(STRIP_FBSDID) 155 #define __FBSDID(s) .ident s 156 #else 157 #define __FBSDID(s) /* nothing */ 158 #endif 159 160 #define WEAK_ALIAS(alias,sym) \ 161 .weak alias; \ 162 alias = sym 163 164 #ifdef __STDC__ 165 #define WARN_REFERENCES(sym,msg) \ 166 .stabs msg ## ,30,0,0,0 ; \ 167 .stabs __STRING(_C_LABEL(sym)) ## ,1,0,0,0 168 #else 169 #define WARN_REFERENCES(sym,msg) \ 170 .stabs msg,30,0,0,0 ; \ 171 .stabs __STRING(sym),1,0,0,0 172 #endif /* __STDC__ */ 173 174 # define RET bx lr 175 # define RETeq bxeq lr 176 # define RETne bxne lr 177 # define RETc(c) bx##c lr 178 179 #if __ARM_ARCH >= 7 180 #define ISB isb 181 #define DSB dsb 182 #define DMB dmb 183 #define WFI wfi 184 185 #if defined(__ARM_ARCH_7VE__) || defined(__clang__) 186 #define MSR_ELR_HYP(regnum) msr elr_hyp, lr 187 #define ERET eret 188 #else 189 #define MSR_ELR_HYP(regnum) .word (0xe12ef300 | regnum) 190 #define ERET .word 0xe160006e 191 #endif 192 193 #elif __ARM_ARCH == 6 194 #include <machine/sysreg.h> 195 #define ISB mcr CP15_CP15ISB 196 #define DSB mcr CP15_CP15DSB 197 #define DMB mcr CP15_CP15DMB 198 #define WFI mcr CP15_CP15WFI 199 #endif 200 201 #endif /* !_MACHINE_ASM_H_ */