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 /* 73 * EENTRY()/EEND() mark "extra" entry/exit points from a function. 74 * LEENTRY()/LEEND() are the same for local symbols. 75 * The unwind info cannot handle the concept of a nested function, or a function 76 * with multiple .fnstart directives, but some of our assembler code is written 77 * with multiple labels to allow entry at several points. The EENTRY() macro 78 * defines such an extra entry point without a new .fnstart, so that it's 79 * basically just a label that you can jump to. The EEND() macro does nothing 80 * at all, except document the exit point associated with the same-named entry. 81 */ 82 #define GLOBAL(x) .global x 83 84 #ifdef __thumb__ 85 #define _FUNC_MODE .code 16; .thumb_func 86 #else 87 #define _FUNC_MODE .code 32 88 #endif 89 90 #define _LEENTRY(x) .type x,_ASM_TYPE_FUNCTION; _FUNC_MODE; x: 91 #define _LEEND(x) /* nothing */ 92 #define _EENTRY(x) GLOBAL(x); _LEENTRY(x) 93 #define _EEND(x) _LEEND(x) 94 95 #define _LENTRY(x) .text; _ALIGN_TEXT; _LEENTRY(x); _FNSTART 96 #define _LEND(x) .size x, . - x; _FNEND 97 #define _ENTRY(x) .text; _ALIGN_TEXT; _EENTRY(x); _FNSTART 98 #define _END(x) _LEND(x) 99 100 #define ENTRY(y) _ENTRY(_C_LABEL(y)); 101 #define EENTRY(y) _EENTRY(_C_LABEL(y)); 102 #define ENTRY_NP(y) _ENTRY(_C_LABEL(y)) 103 #define EENTRY_NP(y) _EENTRY(_C_LABEL(y)) 104 #define END(y) _END(_C_LABEL(y)) 105 #define EEND(y) _EEND(_C_LABEL(y)) 106 #define ASENTRY(y) _ENTRY(_ASM_LABEL(y)); 107 #define ASLENTRY(y) _LENTRY(_ASM_LABEL(y)); 108 #define ASEENTRY(y) _EENTRY(_ASM_LABEL(y)); 109 #define ASLEENTRY(y) _LEENTRY(_ASM_LABEL(y)); 110 #define ASENTRY_NP(y) _ENTRY(_ASM_LABEL(y)) 111 #define ASLENTRY_NP(y) _LENTRY(_ASM_LABEL(y)) 112 #define ASEENTRY_NP(y) _EENTRY(_ASM_LABEL(y)) 113 #define ASLEENTRY_NP(y) _LEENTRY(_ASM_LABEL(y)) 114 #define ASEND(y) _END(_ASM_LABEL(y)) 115 #define ASLEND(y) _LEND(_ASM_LABEL(y)) 116 #define ASEEND(y) _EEND(_ASM_LABEL(y)) 117 #define ASLEEND(y) _LEEND(_ASM_LABEL(y)) 118 119 #define ASMSTR .asciz 120 121 #if defined(PIC) 122 #define PLT_SYM(x) PIC_SYM(x, PLT) 123 #define GOT_SYM(x) PIC_SYM(x, GOT) 124 #define GOT_GET(x,got,sym) \ 125 ldr x, sym; \ 126 ldr x, [x, got] 127 #define GOT_INIT(got,gotsym,pclabel) \ 128 ldr got, gotsym; \ 129 pclabel: add got, pc 130 #ifdef __thumb__ 131 #define GOT_INITSYM(gotsym,pclabel) \ 132 .align 2; \ 133 gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+4) 134 #else 135 #define GOT_INITSYM(gotsym,pclabel) \ 136 .align 2; \ 137 gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+8) 138 #endif 139 140 #ifdef __STDC__ 141 #define PIC_SYM(x,y) x ## ( ## y ## ) 142 #else 143 #define PIC_SYM(x,y) x/**/(/**/y/**/) 144 #endif 145 146 #else 147 #define PLT_SYM(x) x 148 #define GOT_SYM(x) x 149 #define GOT_GET(x,got,sym) \ 150 ldr x, sym; 151 #define GOT_INIT(got,gotsym,pclabel) 152 #define GOT_INITSYM(gotsym,pclabel) 153 #define PIC_SYM(x,y) x 154 #endif /* PIC */ 155 156 #undef __FBSDID 157 #if !defined(lint) && !defined(STRIP_FBSDID) 158 #define __FBSDID(s) .ident s 159 #else 160 #define __FBSDID(s) /* nothing */ 161 #endif 162 163 #define WEAK_ALIAS(alias,sym) \ 164 .weak alias; \ 165 alias = sym 166 167 #ifdef __STDC__ 168 #define WARN_REFERENCES(sym,msg) \ 169 .stabs msg ## ,30,0,0,0 ; \ 170 .stabs __STRING(_C_LABEL(sym)) ## ,1,0,0,0 171 #else 172 #define WARN_REFERENCES(sym,msg) \ 173 .stabs msg,30,0,0,0 ; \ 174 .stabs __STRING(sym),1,0,0,0 175 #endif /* __STDC__ */ 176 177 # define RET bx lr 178 # define RETeq bxeq lr 179 # define RETne bxne lr 180 # define RETc(c) bx##c lr 181 182 #if __ARM_ARCH >= 7 183 #define ISB isb 184 #define DSB dsb 185 #define DMB dmb 186 #define WFI wfi 187 188 #if defined(__ARM_ARCH_7VE__) || defined(__clang__) 189 #define MSR_ELR_HYP(regnum) msr elr_hyp, lr 190 #define ERET eret 191 #else 192 #define MSR_ELR_HYP(regnum) .word (0xe12ef300 | regnum) 193 #define ERET .word 0xe160006e 194 #endif 195 196 #elif __ARM_ARCH == 6 197 #define ISB mcr CP15_CP15ISB 198 #define DSB mcr CP15_CP15DSB 199 #define DMB mcr CP15_CP15DMB 200 #define WFI mcr CP15_CP15WFI 201 #endif 202 203 #endif /* !_MACHINE_ASM_H_ */ 204