asm.h revision 290648
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 290648 2015-11-10 12:02:41Z mmel $ 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#ifndef _STANDALONE 53#define STOP_UNWINDING .cantunwind 54#define _FNSTART .fnstart 55#define _FNEND .fnend 56#define _SAVE(...) .save __VA_ARGS__ 57#else 58#define STOP_UNWINDING 59#define _FNSTART 60#define _FNEND 61#define _SAVE(...) 62#endif 63 64/* 65 * gas/arm uses @ as a single comment character and thus cannot be used here. 66 * It recognises the # instead of an @ symbol in .type directives. 67 */ 68#define _ASM_TYPE_FUNCTION #function 69#define _ASM_TYPE_OBJECT #object 70 71/* XXX Is this still the right prologue for profiling? */ 72#ifdef GPROF 73#define _PROF_PROLOGUE \ 74 mov ip, lr; \ 75 bl __mcount 76#else 77#define _PROF_PROLOGUE 78#endif 79 80/* 81 * EENTRY()/EEND() mark "extra" entry/exit points from a function. 82 * LEENTRY()/LEEND() are the the same for local symbols. 83 * The unwind info cannot handle the concept of a nested function, or a function 84 * with multiple .fnstart directives, but some of our assembler code is written 85 * with multiple labels to allow entry at several points. The EENTRY() macro 86 * defines such an extra entry point without a new .fnstart, so that it's 87 * basically just a label that you can jump to. The EEND() macro does nothing 88 * at all, except document the exit point associated with the same-named entry. 89 */ 90#define GLOBAL(x) .global x 91 92#ifdef __thumb__ 93#define _FUNC_MODE .code 16; .thumb_func 94#else 95#define _FUNC_MODE .code 32 96#endif 97 98#define _LEENTRY(x) .type x,_ASM_TYPE_FUNCTION; _FUNC_MODE; x: 99#define _LEEND(x) /* nothing */ 100#define _EENTRY(x) GLOBAL(x); _LEENTRY(x) 101#define _EEND(x) _LEEND(x) 102 103#define _LENTRY(x) .text; _ALIGN_TEXT; _LEENTRY(x); _FNSTART 104#define _LEND(x) .size x, . - x; _FNEND 105#define _ENTRY(x) .text; _ALIGN_TEXT; _EENTRY(x); _FNSTART 106#define _END(x) _LEND(x) 107 108#define ENTRY(y) _ENTRY(_C_LABEL(y)); _PROF_PROLOGUE 109#define EENTRY(y) _EENTRY(_C_LABEL(y)); 110#define ENTRY_NP(y) _ENTRY(_C_LABEL(y)) 111#define EENTRY_NP(y) _EENTRY(_C_LABEL(y)) 112#define END(y) _END(_C_LABEL(y)) 113#define EEND(y) _EEND(_C_LABEL(y)) 114#define ASENTRY(y) _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE 115#define ASLENTRY(y) _LENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE 116#define ASEENTRY(y) _EENTRY(_ASM_LABEL(y)); 117#define ASLEENTRY(y) _LEENTRY(_ASM_LABEL(y)); 118#define ASENTRY_NP(y) _ENTRY(_ASM_LABEL(y)) 119#define ASLENTRY_NP(y) _LENTRY(_ASM_LABEL(y)) 120#define ASEENTRY_NP(y) _EENTRY(_ASM_LABEL(y)) 121#define ASLEENTRY_NP(y) _LEENTRY(_ASM_LABEL(y)) 122#define ASEND(y) _END(_ASM_LABEL(y)) 123#define ASLEND(y) _LEND(_ASM_LABEL(y)) 124#define ASEEND(y) _EEND(_ASM_LABEL(y)) 125#define ASLEEND(y) _LEEND(_ASM_LABEL(y)) 126 127#define ASMSTR .asciz 128 129#if defined(PIC) 130#define PLT_SYM(x) PIC_SYM(x, PLT) 131#define GOT_SYM(x) PIC_SYM(x, GOT) 132#define GOT_GET(x,got,sym) \ 133 ldr x, sym; \ 134 ldr x, [x, got] 135#define GOT_INIT(got,gotsym,pclabel) \ 136 ldr got, gotsym; \ 137 pclabel: add got, pc 138#ifdef __thumb__ 139#define GOT_INITSYM(gotsym,pclabel) \ 140 .align 2; \ 141 gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+4) 142#else 143#define GOT_INITSYM(gotsym,pclabel) \ 144 .align 2; \ 145 gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+8) 146#endif 147 148#ifdef __STDC__ 149#define PIC_SYM(x,y) x ## ( ## y ## ) 150#else 151#define PIC_SYM(x,y) x/**/(/**/y/**/) 152#endif 153 154#else 155#define PLT_SYM(x) x 156#define GOT_SYM(x) x 157#define GOT_GET(x,got,sym) \ 158 ldr x, sym; 159#define GOT_INIT(got,gotsym,pclabel) 160#define GOT_INITSYM(gotsym,pclabel) 161#define PIC_SYM(x,y) x 162#endif /* PIC */ 163 164#undef __FBSDID 165#if !defined(lint) && !defined(STRIP_FBSDID) 166#define __FBSDID(s) .ident s 167#else 168#define __FBSDID(s) /* nothing */ 169#endif 170 171 172#define WEAK_ALIAS(alias,sym) \ 173 .weak alias; \ 174 alias = sym 175 176#ifdef __STDC__ 177#define WARN_REFERENCES(sym,msg) \ 178 .stabs msg ## ,30,0,0,0 ; \ 179 .stabs __STRING(_C_LABEL(sym)) ## ,1,0,0,0 180#else 181#define WARN_REFERENCES(sym,msg) \ 182 .stabs msg,30,0,0,0 ; \ 183 .stabs __STRING(sym),1,0,0,0 184#endif /* __STDC__ */ 185 186/* Exactly one of the __ARM_ARCH_*__ macros will be defined by the compiler. */ 187/* The _ARM_ARCH_* macros are deprecated and will be removed soon. */ 188/* This should be moved into another header so it can be used in 189 * both asm and C code. machine/asm.h cannot be included in C code. */ 190#if defined (__ARM_ARCH_7__) || defined (__ARM_ARCH_7A__) 191#define _ARM_ARCH_7 192#define _HAVE_ARMv7_INSTRUCTIONS 1 193#endif 194 195#if defined (_HAVE_ARMv7_INSTRUCTIONS) || defined (__ARM_ARCH_6__) || \ 196 defined (__ARM_ARCH_6J__) || defined (__ARM_ARCH_6K__) || \ 197 defined (__ARM_ARCH_6Z__) || defined (__ARM_ARCH_6ZK__) 198#define _ARM_ARCH_6 199#define _HAVE_ARMv6_INSTRUCTIONS 1 200#endif 201 202#if defined (_HAVE_ARMv6_INSTRUCTIONS) || defined (__ARM_ARCH_5TE__) || \ 203 defined (__ARM_ARCH_5TEJ__) || defined (__ARM_ARCH_5E__) 204#define _ARM_ARCH_5E 205#define _HAVE_ARMv5E_INSTRUCTIONS 1 206#endif 207 208#if defined (_HAVE_ARMv5E_INSTRUCTIONS) || defined (__ARM_ARCH_5__) || \ 209 defined (__ARM_ARCH_5T__) 210#define _ARM_ARCH_5 211#define _HAVE_ARMv5_INSTRUCTIONS 1 212#endif 213 214#if defined (_HAVE_ARMv5_INSTRUCTIONS) || defined (__ARM_ARCH_4T__) 215#define _ARM_ARCH_4T 216#define _HAVE_ARMv4T_INSTRUCTIONS 1 217#endif 218 219/* FreeBSD requires ARMv4, so this is always set. */ 220#define _HAVE_ARMv4_INSTRUCTIONS 1 221 222#if defined (_HAVE_ARMv4T_INSTRUCTIONS) 223# define RET bx lr 224# define RETeq bxeq lr 225# define RETne bxne lr 226# define RETc(c) bx##c lr 227#else 228# define RET mov pc, lr 229# define RETeq moveq pc, lr 230# define RETne movne pc, lr 231# define RETc(c) mov##c pc, lr 232#endif 233 234#if __ARM_ARCH >= 7 235#define ISB isb 236#define DSB dsb 237#define DMB dmb 238#define WFI wfi 239#elif __ARM_ARCH == 6 240#define ISB mcr CP15_CP15ISB 241#define DSB mcr CP15_CP15DSB 242#define DMB mcr CP15_CP15DMB 243#define WFI mcr CP15_CP15WFI 244#else 245#define ISB mcr CP15_CP15ISB 246#define DSB mcr CP15_CP15DSB /* DSB and DMB are the */ 247#define DMB mcr CP15_CP15DSB /* same prior to v6.*/ 248/* No form of WFI available on v4, define nothing to get an error on use. */ 249#endif 250 251#endif /* !_MACHINE_ASM_H_ */ 252