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