asm.h revision 276212
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 276212 2014-12-25 19:08:39Z ian $ 37 */ 38 39#ifndef _MACHINE_ASM_H_ 40#define _MACHINE_ASM_H_ 41#include <sys/cdefs.h> 42#include <machine/sysreg.h> 43 44#define _C_LABEL(x) x 45#define _ASM_LABEL(x) x 46 47#ifndef _ALIGN_TEXT 48# define _ALIGN_TEXT .align 0 49#endif 50 51#if defined(__ARM_EABI__) && !defined(_STANDALONE) 52#define STOP_UNWINDING .cantunwind 53#define _FNSTART .fnstart 54#define _FNEND .fnend 55#else 56#define STOP_UNWINDING 57#define _FNSTART 58#define _FNEND 59#endif 60 61/* 62 * gas/arm uses @ as a single comment character and thus cannot be used here. 63 * It recognises the # instead of an @ symbol in .type directives. 64 */ 65#define _ASM_TYPE_FUNCTION #function 66#define _ASM_TYPE_OBJECT #object 67 68/* XXX Is this still the right prologue for profiling? */ 69#ifdef GPROF 70#define _PROF_PROLOGUE \ 71 mov ip, lr; \ 72 bl __mcount 73#else 74#define _PROF_PROLOGUE 75#endif 76 77/* 78 * EENTRY()/EEND() mark "extra" entry/exit points from a function. 79 * LEENTRY()/LEEND() are the the same for local symbols. 80 * The unwind info cannot handle the concept of a nested function, or a function 81 * with multiple .fnstart directives, but some of our assembler code is written 82 * with multiple labels to allow entry at several points. The EENTRY() macro 83 * defines such an extra entry point without a new .fnstart, so that it's 84 * basically just a label that you can jump to. The EEND() macro does nothing 85 * at all, except document the exit point associated with the same-named entry. 86 */ 87#define GLOBAL(x) .global x 88 89#define _LEENTRY(x) .type x,_ASM_TYPE_FUNCTION; x: 90#define _LEEND(x) /* nothing */ 91#define _EENTRY(x) GLOBAL(x); _LEENTRY(x) 92#define _EEND(x) _LEEND(x) 93 94#define _LENTRY(x) .text; _ALIGN_TEXT; _LEENTRY(x); _FNSTART 95#define _LEND(x) .size x, . - x; _FNEND 96#define _ENTRY(x) .text; _ALIGN_TEXT; _EENTRY(x); _FNSTART 97#define _END(x) _LEND(x) 98 99#define ENTRY(y) _ENTRY(_C_LABEL(y)); _PROF_PROLOGUE 100#define EENTRY(y) _EENTRY(_C_LABEL(y)); 101#define ENTRY_NP(y) _ENTRY(_C_LABEL(y)) 102#define EENTRY_NP(y) _EENTRY(_C_LABEL(y)) 103#define END(y) _END(_C_LABEL(y)) 104#define EEND(y) _EEND(_C_LABEL(y)) 105#define ASENTRY(y) _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE 106#define ASLENTRY(y) _LENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE 107#define ASEENTRY(y) _EENTRY(_ASM_LABEL(y)); 108#define ASLEENTRY(y) _LEENTRY(_ASM_LABEL(y)); 109#define ASENTRY_NP(y) _ENTRY(_ASM_LABEL(y)) 110#define ASLENTRY_NP(y) _LENTRY(_ASM_LABEL(y)) 111#define ASEENTRY_NP(y) _EENTRY(_ASM_LABEL(y)) 112#define ASLEENTRY_NP(y) _LEENTRY(_ASM_LABEL(y)) 113#define ASEND(y) _END(_ASM_LABEL(y)) 114#define ASLEND(y) _LEND(_ASM_LABEL(y)) 115#define ASEEND(y) _EEND(_ASM_LABEL(y)) 116#define ASLEEND(y) _LEEND(_ASM_LABEL(y)) 117 118#define ASMSTR .asciz 119 120#if defined(PIC) 121#define PLT_SYM(x) PIC_SYM(x, PLT) 122#define GOT_SYM(x) PIC_SYM(x, GOT) 123#define GOT_GET(x,got,sym) \ 124 ldr x, sym; \ 125 ldr x, [x, got] 126#define GOT_INIT(got,gotsym,pclabel) \ 127 ldr got, gotsym; \ 128 pclabel: add got, got, pc 129#ifdef __thumb__ 130#define GOT_INITSYM(gotsym,pclabel) \ 131 .align 0; \ 132 gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+4) 133#else 134#define GOT_INITSYM(gotsym,pclabel) \ 135 .align 0; \ 136 gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+8) 137#endif 138 139#ifdef __STDC__ 140#define PIC_SYM(x,y) x ## ( ## y ## ) 141#else 142#define PIC_SYM(x,y) x/**/(/**/y/**/) 143#endif 144 145#else 146#define PLT_SYM(x) x 147#define GOT_SYM(x) x 148#define GOT_GET(x,got,sym) \ 149 ldr x, sym; 150#define GOT_INIT(got,gotsym,pclabel) 151#define GOT_INITSYM(gotsym,pclabel) 152#define PIC_SYM(x,y) x 153#endif /* PIC */ 154 155#undef __FBSDID 156#if !defined(lint) && !defined(STRIP_FBSDID) 157#define __FBSDID(s) .ident s 158#else 159#define __FBSDID(s) /* nothing */ 160#endif 161 162 163#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/* Exactly one of the __ARM_ARCH_*__ macros will be defined by the compiler. */ 178/* The _ARM_ARCH_* macros are deprecated and will be removed soon. */ 179/* This should be moved into another header so it can be used in 180 * both asm and C code. machine/asm.h cannot be included in C code. */ 181#if defined (__ARM_ARCH_7__) || defined (__ARM_ARCH_7A__) 182#define _ARM_ARCH_7 183#define _HAVE_ARMv7_INSTRUCTIONS 1 184#endif 185 186#if defined (_HAVE_ARMv7_INSTRUCTIONS) || defined (__ARM_ARCH_6__) || \ 187 defined (__ARM_ARCH_6J__) || defined (__ARM_ARCH_6K__) || \ 188 defined (__ARM_ARCH_6Z__) || defined (__ARM_ARCH_6ZK__) 189#define _ARM_ARCH_6 190#define _HAVE_ARMv6_INSTRUCTIONS 1 191#endif 192 193#if defined (_HAVE_ARMv6_INSTRUCTIONS) || defined (__ARM_ARCH_5TE__) || \ 194 defined (__ARM_ARCH_5TEJ__) || defined (__ARM_ARCH_5E__) 195#define _ARM_ARCH_5E 196#define _HAVE_ARMv5E_INSTRUCTIONS 1 197#endif 198 199#if defined (_HAVE_ARMv5E_INSTRUCTIONS) || defined (__ARM_ARCH_5__) || \ 200 defined (__ARM_ARCH_5T__) 201#define _ARM_ARCH_5 202#define _HAVE_ARMv5_INSTRUCTIONS 1 203#endif 204 205#if defined (_HAVE_ARMv5_INSTRUCTIONS) || defined (__ARM_ARCH_4T__) 206#define _ARM_ARCH_4T 207#define _HAVE_ARMv4T_INSTRUCTIONS 1 208#endif 209 210/* FreeBSD requires ARMv4, so this is always set. */ 211#define _HAVE_ARMv4_INSTRUCTIONS 1 212 213#if defined (_HAVE_ARMv4T_INSTRUCTIONS) 214# define RET bx lr 215# define RETeq bxeq lr 216# define RETne bxne lr 217# define RETc(c) bx##c lr 218#else 219# define RET mov pc, lr 220# define RETeq moveq pc, lr 221# define RETne movne pc, lr 222# define RETc(c) mov##c pc, lr 223#endif 224 225#if __ARM_ARCH >= 7 226#define ISB isb 227#define DSB dsb 228#define DMB dmb 229#elif __ARM_ARCH == 6 230#define ISB mcr CP15_CP15ISB 231#define DSB mcr CP15_CP15DSB 232#define DMB mcr CP15_CP15DMB 233#else 234#define ISB mcr CP15_CP15ISB 235#define DSB mcr CP15_CP15DSB /* DSB and DMB are the */ 236#define DMB mcr CP15_CP15DSB /* same prior to v6.*/ 237#endif 238 239#endif /* !_MACHINE_ASM_H_ */ 240