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 37 #ifndef _MACHINE_ASM_H_ 38 #define _MACHINE_ASM_H_ 39 #include <sys/cdefs.h> 40 41 #define _C_LABEL(x) x 42 #define _ASM_LABEL(x) x 43 44 #ifndef _ALIGN_TEXT 45 # define _ALIGN_TEXT .align 2 46 #endif 47 48 #ifndef _STANDALONE 49 #define STOP_UNWINDING .cantunwind 50 #define _FNSTART .fnstart 51 #define _FNEND .fnend 52 #define _SAVE(...) .save __VA_ARGS__ 53 #else 54 #define STOP_UNWINDING 55 #define _FNSTART 56 #define _FNEND 57 #define _SAVE(...) 58 #endif 59 60 /* 61 * gas/arm uses @ as a single comment character and thus cannot be used here. 62 * It recognises the # instead of an @ symbol in .type directives. 63 */ 64 #define _ASM_TYPE_FUNCTION #function 65 #define _ASM_TYPE_OBJECT #object 66 67 /* 68 * EENTRY()/EEND() mark "extra" entry/exit points from a function. 69 * LEENTRY()/LEEND() are the same for local symbols. 70 * The unwind info cannot handle the concept of a nested function, or a function 71 * with multiple .fnstart directives, but some of our assembler code is written 72 * with multiple labels to allow entry at several points. The EENTRY() macro 73 * defines such an extra entry point without a new .fnstart, so that it's 74 * basically just a label that you can jump to. The EEND() macro does nothing 75 * at all, except document the exit point associated with the same-named entry. 76 */ 77 #define GLOBAL(x) .global x 78 79 #ifdef __thumb__ 80 #define _FUNC_MODE .code 16; .thumb_func 81 #else 82 #define _FUNC_MODE .code 32 83 #endif 84 85 #define _LEENTRY(x) .type x,_ASM_TYPE_FUNCTION; _FUNC_MODE; x: 86 #define _LEEND(x) /* nothing */ 87 #define _EENTRY(x) GLOBAL(x); _LEENTRY(x) 88 #define _EEND(x) _LEEND(x) 89 90 #define _LENTRY(x) .text; _ALIGN_TEXT; _LEENTRY(x); _FNSTART 91 #define _LEND(x) .size x, . - x; _FNEND 92 #define _ENTRY(x) .text; _ALIGN_TEXT; _EENTRY(x); _FNSTART 93 #define _END(x) _LEND(x) 94 95 #define ENTRY(y) _ENTRY(_C_LABEL(y)); 96 #define EENTRY(y) _EENTRY(_C_LABEL(y)); 97 #define ENTRY_NP(y) _ENTRY(_C_LABEL(y)) 98 #define EENTRY_NP(y) _EENTRY(_C_LABEL(y)) 99 #define END(y) _END(_C_LABEL(y)) 100 #define EEND(y) _EEND(_C_LABEL(y)) 101 #define ASENTRY(y) _ENTRY(_ASM_LABEL(y)); 102 #define ASLENTRY(y) _LENTRY(_ASM_LABEL(y)); 103 #define ASEENTRY(y) _EENTRY(_ASM_LABEL(y)); 104 #define ASLEENTRY(y) _LEENTRY(_ASM_LABEL(y)); 105 #define ASENTRY_NP(y) _ENTRY(_ASM_LABEL(y)) 106 #define ASLENTRY_NP(y) _LENTRY(_ASM_LABEL(y)) 107 #define ASEENTRY_NP(y) _EENTRY(_ASM_LABEL(y)) 108 #define ASLEENTRY_NP(y) _LEENTRY(_ASM_LABEL(y)) 109 #define ASEND(y) _END(_ASM_LABEL(y)) 110 #define ASLEND(y) _LEND(_ASM_LABEL(y)) 111 #define ASEEND(y) _EEND(_ASM_LABEL(y)) 112 #define ASLEEND(y) _LEEND(_ASM_LABEL(y)) 113 114 #define ASMSTR .asciz 115 116 #if defined(PIC) 117 #define PLT_SYM(x) PIC_SYM(x, PLT) 118 #define GOT_SYM(x) PIC_SYM(x, GOT) 119 #define GOT_GET(x,got,sym) \ 120 ldr x, sym; \ 121 ldr x, [x, got] 122 #define GOT_INIT(got,gotsym,pclabel) \ 123 ldr got, gotsym; \ 124 pclabel: add got, pc 125 #ifdef __thumb__ 126 #define GOT_INITSYM(gotsym,pclabel) \ 127 .align 2; \ 128 gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+4) 129 #else 130 #define GOT_INITSYM(gotsym,pclabel) \ 131 .align 2; \ 132 gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+8) 133 #endif 134 135 #ifdef __STDC__ 136 #define PIC_SYM(x,y) x ## ( ## y ## ) 137 #else 138 #define PIC_SYM(x,y) x/**/(/**/y/**/) 139 #endif 140 141 #else 142 #define PLT_SYM(x) x 143 #define GOT_SYM(x) x 144 #define GOT_GET(x,got,sym) \ 145 ldr x, sym; 146 #define GOT_INIT(got,gotsym,pclabel) 147 #define GOT_INITSYM(gotsym,pclabel) 148 #define PIC_SYM(x,y) x 149 #endif /* PIC */ 150 151 #undef __FBSDID 152 #if !defined(lint) && !defined(STRIP_FBSDID) 153 #define __FBSDID(s) .ident s 154 #else 155 #define __FBSDID(s) /* nothing */ 156 #endif 157 158 #define WEAK_ALIAS(alias,sym) \ 159 .weak alias; \ 160 alias = sym 161 162 #ifdef __STDC__ 163 #define WARN_REFERENCES(sym,msg) \ 164 .stabs msg ## ,30,0,0,0 ; \ 165 .stabs __STRING(_C_LABEL(sym)) ## ,1,0,0,0 166 #else 167 #define WARN_REFERENCES(sym,msg) \ 168 .stabs msg,30,0,0,0 ; \ 169 .stabs __STRING(sym),1,0,0,0 170 #endif /* __STDC__ */ 171 172 # define RET bx lr 173 # define RETeq bxeq lr 174 # define RETne bxne lr 175 # define RETc(c) bx##c lr 176 177 #if __ARM_ARCH >= 7 178 #define ISB isb 179 #define DSB dsb 180 #define DMB dmb 181 #define WFI wfi 182 183 #if defined(__ARM_ARCH_7VE__) || defined(__clang__) 184 #define MSR_ELR_HYP(regnum) msr elr_hyp, lr 185 #define ERET eret 186 #else 187 #define MSR_ELR_HYP(regnum) .word (0xe12ef300 | regnum) 188 #define ERET .word 0xe160006e 189 #endif 190 191 #elif __ARM_ARCH == 6 192 #include <machine/sysreg.h> 193 #define ISB mcr CP15_CP15ISB 194 #define DSB mcr CP15_CP15DSB 195 #define DMB mcr CP15_CP15DMB 196 #define WFI mcr CP15_CP15WFI 197 #endif 198 199 #endif /* !_MACHINE_ASM_H_ */ 200