asm.h revision 282777
1/* $NetBSD: asm.h,v 1.5 2003/08/07 16:26:53 agc Exp $ */ 2 3/*- 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * William Jolitz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * from: @(#)asm.h 5.5 (Berkeley) 5/7/91 35 * 36 * $FreeBSD: head/sys/arm/include/asm.h 282777 2015-05-11 19:00:02Z andrew $ 37 */ 38 39#ifndef _MACHINE_ASM_H_ 40#define _MACHINE_ASM_H_ 41#include <sys/cdefs.h> 42#include <machine/acle-compat.h> 43#include <machine/sysreg.h> 44 45#define _C_LABEL(x) x 46#define _ASM_LABEL(x) x 47 48#ifndef _ALIGN_TEXT 49# define _ALIGN_TEXT .align 2 50#endif 51 52#if defined(__ARM_EABI__) && !defined(_STANDALONE) 53#define STOP_UNWINDING .cantunwind 54#define _FNSTART .fnstart 55#define _FNEND .fnend 56#else 57#define STOP_UNWINDING 58#define _FNSTART 59#define _FNEND 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/* XXX Is this still the right prologue for profiling? */ 70#ifdef GPROF 71#define _PROF_PROLOGUE \ 72 mov ip, lr; \ 73 bl __mcount 74#else 75#define _PROF_PROLOGUE 76#endif 77 78/* 79 * EENTRY()/EEND() mark "extra" entry/exit points from a function. 80 * LEENTRY()/LEEND() are the the same for local symbols. 81 * The unwind info cannot handle the concept of a nested function, or a function 82 * with multiple .fnstart directives, but some of our assembler code is written 83 * with multiple labels to allow entry at several points. The EENTRY() macro 84 * defines such an extra entry point without a new .fnstart, so that it's 85 * basically just a label that you can jump to. The EEND() macro does nothing 86 * at all, except document the exit point associated with the same-named entry. 87 */ 88#define GLOBAL(x) .global x 89 90#define _LEENTRY(x) .type x,_ASM_TYPE_FUNCTION; 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)); _PROF_PROLOGUE 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)); _PROF_PROLOGUE 107#define ASLENTRY(y) _LENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE 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 162 163 164#define WEAK_ALIAS(alias,sym) \ 165 .weak alias; \ 166 alias = sym 167 168#ifdef __STDC__ 169#define WARN_REFERENCES(sym,msg) \ 170 .stabs msg ## ,30,0,0,0 ; \ 171 .stabs __STRING(_C_LABEL(sym)) ## ,1,0,0,0 172#else 173#define WARN_REFERENCES(sym,msg) \ 174 .stabs msg,30,0,0,0 ; \ 175 .stabs __STRING(sym),1,0,0,0 176#endif /* __STDC__ */ 177 178/* Exactly one of the __ARM_ARCH_*__ macros will be defined by the compiler. */ 179/* The _ARM_ARCH_* macros are deprecated and will be removed soon. */ 180/* This should be moved into another header so it can be used in 181 * both asm and C code. machine/asm.h cannot be included in C code. */ 182#if defined (__ARM_ARCH_7__) || defined (__ARM_ARCH_7A__) 183#define _ARM_ARCH_7 184#define _HAVE_ARMv7_INSTRUCTIONS 1 185#endif 186 187#if defined (_HAVE_ARMv7_INSTRUCTIONS) || defined (__ARM_ARCH_6__) || \ 188 defined (__ARM_ARCH_6J__) || defined (__ARM_ARCH_6K__) || \ 189 defined (__ARM_ARCH_6Z__) || defined (__ARM_ARCH_6ZK__) 190#define _ARM_ARCH_6 191#define _HAVE_ARMv6_INSTRUCTIONS 1 192#endif 193 194#if defined (_HAVE_ARMv6_INSTRUCTIONS) || defined (__ARM_ARCH_5TE__) || \ 195 defined (__ARM_ARCH_5TEJ__) || defined (__ARM_ARCH_5E__) 196#define _ARM_ARCH_5E 197#define _HAVE_ARMv5E_INSTRUCTIONS 1 198#endif 199 200#if defined (_HAVE_ARMv5E_INSTRUCTIONS) || defined (__ARM_ARCH_5__) || \ 201 defined (__ARM_ARCH_5T__) 202#define _ARM_ARCH_5 203#define _HAVE_ARMv5_INSTRUCTIONS 1 204#endif 205 206#if defined (_HAVE_ARMv5_INSTRUCTIONS) || defined (__ARM_ARCH_4T__) 207#define _ARM_ARCH_4T 208#define _HAVE_ARMv4T_INSTRUCTIONS 1 209#endif 210 211/* FreeBSD requires ARMv4, so this is always set. */ 212#define _HAVE_ARMv4_INSTRUCTIONS 1 213 214#if defined (_HAVE_ARMv4T_INSTRUCTIONS) 215# define RET bx lr 216# define RETeq bxeq lr 217# define RETne bxne lr 218# define RETc(c) bx##c lr 219#else 220# define RET mov pc, lr 221# define RETeq moveq pc, lr 222# define RETne movne pc, lr 223# define RETc(c) mov##c pc, lr 224#endif 225 226#if __ARM_ARCH >= 7 227#define ISB isb 228#define DSB dsb 229#define DMB dmb 230#define WFI wfi 231#elif __ARM_ARCH == 6 232#define ISB mcr CP15_CP15ISB 233#define DSB mcr CP15_CP15DSB 234#define DMB mcr CP15_CP15DMB 235#define WFI mcr CP15_CP15WFI 236#else 237#define ISB mcr CP15_CP15ISB 238#define DSB mcr CP15_CP15DSB /* DSB and DMB are the */ 239#define DMB mcr CP15_CP15DSB /* same prior to v6.*/ 240/* No form of WFI available on v4, define nothing to get an error on use. */ 241#endif 242 243#endif /* !_MACHINE_ASM_H_ */ 244