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 * $FreeBSD$ 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 2 49#endif 50 51#ifndef _STANDALONE 52#define STOP_UNWINDING .cantunwind 53#define _FNSTART .fnstart 54#define _FNEND .fnend 55#define _SAVE(...) .save __VA_ARGS__ 56#else 57#define STOP_UNWINDING 58#define _FNSTART 59#define _FNEND 60#define _SAVE(...) 61#endif 62 63/* 64 * gas/arm uses @ as a single comment character and thus cannot be used here. 65 * It recognises the # instead of an @ symbol in .type directives. 66 */ 67#define _ASM_TYPE_FUNCTION #function 68#define _ASM_TYPE_OBJECT #object 69 70/* XXX Is this still the right prologue for profiling? */ 71#ifdef GPROF 72#define _PROF_PROLOGUE \ 73 mov ip, lr; \ 74 bl __mcount 75#else 76#define _PROF_PROLOGUE 77#endif 78 79/* 80 * EENTRY()/EEND() mark "extra" entry/exit points from a function. 81 * LEENTRY()/LEEND() are the same for local symbols. 82 * The unwind info cannot handle the concept of a nested function, or a function 83 * with multiple .fnstart directives, but some of our assembler code is written 84 * with multiple labels to allow entry at several points. The EENTRY() macro 85 * defines such an extra entry point without a new .fnstart, so that it's 86 * basically just a label that you can jump to. The EEND() macro does nothing 87 * at all, except document the exit point associated with the same-named entry. 88 */ 89#define GLOBAL(x) .global x 90 91#ifdef __thumb__ 92#define _FUNC_MODE .code 16; .thumb_func 93#else 94#define _FUNC_MODE .code 32 95#endif 96 97#define _LEENTRY(x) .type x,_ASM_TYPE_FUNCTION; _FUNC_MODE; x: 98#define _LEEND(x) /* nothing */ 99#define _EENTRY(x) GLOBAL(x); _LEENTRY(x) 100#define _EEND(x) _LEEND(x) 101 102#define _LENTRY(x) .text; _ALIGN_TEXT; _LEENTRY(x); _FNSTART 103#define _LEND(x) .size x, . - x; _FNEND 104#define _ENTRY(x) .text; _ALIGN_TEXT; _EENTRY(x); _FNSTART 105#define _END(x) _LEND(x) 106 107#define ENTRY(y) _ENTRY(_C_LABEL(y)); _PROF_PROLOGUE 108#define EENTRY(y) _EENTRY(_C_LABEL(y)); 109#define ENTRY_NP(y) _ENTRY(_C_LABEL(y)) 110#define EENTRY_NP(y) _EENTRY(_C_LABEL(y)) 111#define END(y) _END(_C_LABEL(y)) 112#define EEND(y) _EEND(_C_LABEL(y)) 113#define ASENTRY(y) _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE 114#define ASLENTRY(y) _LENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE 115#define ASEENTRY(y) _EENTRY(_ASM_LABEL(y)); 116#define ASLEENTRY(y) _LEENTRY(_ASM_LABEL(y)); 117#define ASENTRY_NP(y) _ENTRY(_ASM_LABEL(y)) 118#define ASLENTRY_NP(y) _LENTRY(_ASM_LABEL(y)) 119#define ASEENTRY_NP(y) _EENTRY(_ASM_LABEL(y)) 120#define ASLEENTRY_NP(y) _LEENTRY(_ASM_LABEL(y)) 121#define ASEND(y) _END(_ASM_LABEL(y)) 122#define ASLEND(y) _LEND(_ASM_LABEL(y)) 123#define ASEEND(y) _EEND(_ASM_LABEL(y)) 124#define ASLEEND(y) _LEEND(_ASM_LABEL(y)) 125 126#define ASMSTR .asciz 127 128#if defined(PIC) 129#define PLT_SYM(x) PIC_SYM(x, PLT) 130#define GOT_SYM(x) PIC_SYM(x, GOT) 131#define GOT_GET(x,got,sym) \ 132 ldr x, sym; \ 133 ldr x, [x, got] 134#define GOT_INIT(got,gotsym,pclabel) \ 135 ldr got, gotsym; \ 136 pclabel: add got, pc 137#ifdef __thumb__ 138#define GOT_INITSYM(gotsym,pclabel) \ 139 .align 2; \ 140 gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+4) 141#else 142#define GOT_INITSYM(gotsym,pclabel) \ 143 .align 2; \ 144 gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+8) 145#endif 146 147#ifdef __STDC__ 148#define PIC_SYM(x,y) x ## ( ## y ## ) 149#else 150#define PIC_SYM(x,y) x/**/(/**/y/**/) 151#endif 152 153#else 154#define PLT_SYM(x) x 155#define GOT_SYM(x) x 156#define GOT_GET(x,got,sym) \ 157 ldr x, sym; 158#define GOT_INIT(got,gotsym,pclabel) 159#define GOT_INITSYM(gotsym,pclabel) 160#define PIC_SYM(x,y) x 161#endif /* PIC */ 162 163#undef __FBSDID 164#if !defined(lint) && !defined(STRIP_FBSDID) 165#define __FBSDID(s) .ident s 166#else 167#define __FBSDID(s) /* nothing */ 168#endif 169 170 171#define WEAK_ALIAS(alias,sym) \ 172 .weak alias; \ 173 alias = sym 174 175#ifdef __STDC__ 176#define WARN_REFERENCES(sym,msg) \ 177 .stabs msg ## ,30,0,0,0 ; \ 178 .stabs __STRING(_C_LABEL(sym)) ## ,1,0,0,0 179#else 180#define WARN_REFERENCES(sym,msg) \ 181 .stabs msg,30,0,0,0 ; \ 182 .stabs __STRING(sym),1,0,0,0 183#endif /* __STDC__ */ 184 185/* Exactly one of the __ARM_ARCH_*__ macros will be defined by the compiler. */ 186/* The _ARM_ARCH_* macros are deprecated and will be removed soon. */ 187/* This should be moved into another header so it can be used in 188 * both asm and C code. machine/asm.h cannot be included in C code. */ 189#if defined (__ARM_ARCH_7__) || defined (__ARM_ARCH_7A__) 190#define _ARM_ARCH_7 191#define _HAVE_ARMv7_INSTRUCTIONS 1 192#endif 193 194#if defined (_HAVE_ARMv7_INSTRUCTIONS) || defined (__ARM_ARCH_6__) || \ 195 defined (__ARM_ARCH_6J__) || defined (__ARM_ARCH_6K__) || \ 196 defined (__ARM_ARCH_6Z__) || defined (__ARM_ARCH_6ZK__) 197#define _ARM_ARCH_6 198#define _HAVE_ARMv6_INSTRUCTIONS 1 199#endif 200 201#if defined (_HAVE_ARMv6_INSTRUCTIONS) || defined (__ARM_ARCH_5TE__) || \ 202 defined (__ARM_ARCH_5TEJ__) || defined (__ARM_ARCH_5E__) 203#define _ARM_ARCH_5E 204#define _HAVE_ARMv5E_INSTRUCTIONS 1 205#endif 206 207#if defined (_HAVE_ARMv5E_INSTRUCTIONS) || defined (__ARM_ARCH_5__) || \ 208 defined (__ARM_ARCH_5T__) 209#define _ARM_ARCH_5 210#define _HAVE_ARMv5_INSTRUCTIONS 1 211#endif 212 213#if defined (_HAVE_ARMv5_INSTRUCTIONS) || defined (__ARM_ARCH_4T__) 214#define _ARM_ARCH_4T 215#define _HAVE_ARMv4T_INSTRUCTIONS 1 216#endif 217 218/* FreeBSD requires ARMv4, so this is always set. */ 219#define _HAVE_ARMv4_INSTRUCTIONS 1 220 221#if defined (_HAVE_ARMv4T_INSTRUCTIONS) 222# define RET bx lr 223# define RETeq bxeq lr 224# define RETne bxne lr 225# define RETc(c) bx##c lr 226#else 227# define RET mov pc, lr 228# define RETeq moveq pc, lr 229# define RETne movne pc, lr 230# define RETc(c) mov##c pc, lr 231#endif 232 233#if __ARM_ARCH >= 7 234#define ISB isb 235#define DSB dsb 236#define DMB dmb 237#define WFI wfi 238#elif __ARM_ARCH == 6 239#define ISB mcr CP15_CP15ISB 240#define DSB mcr CP15_CP15DSB 241#define DMB mcr CP15_CP15DMB 242#define WFI mcr CP15_CP15WFI 243#else 244#define ISB mcr CP15_CP15ISB 245#define DSB mcr CP15_CP15DSB /* DSB and DMB are the */ 246#define DMB mcr CP15_CP15DSB /* same prior to v6.*/ 247/* No form of WFI available on v4, define nothing to get an error on use. */ 248#endif 249 250#endif /* !_MACHINE_ASM_H_ */ 251