1/* $NetBSD: asm.h,v 1.39 2010/12/20 21:11:24 joerg 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 * @(#)asm.h 5.5 (Berkeley) 5/7/91 35 */ 36 37#ifndef _I386_ASM_H_ 38#define _I386_ASM_H_ 39 40#ifdef _KERNEL_OPT 41#include "opt_multiprocessor.h" 42#endif 43 44#ifdef PIC 45#define PIC_PROLOGUE \ 46 pushl %ebx; \ 47 call 1f; \ 481: \ 49 popl %ebx; \ 50 addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %ebx 51#define PIC_EPILOGUE \ 52 popl %ebx 53#define PIC_PLT(x) x@PLT 54#define PIC_GOT(x) x@GOT(%ebx) 55#define PIC_GOTOFF(x) x@GOTOFF(%ebx) 56#else 57#define PIC_PROLOGUE 58#define PIC_EPILOGUE 59#define PIC_PLT(x) x 60#define PIC_GOT(x) x 61#define PIC_GOTOFF(x) x 62#endif 63 64#ifdef __ELF__ 65# define _C_LABEL(x) x 66#else 67# ifdef __STDC__ 68# define _C_LABEL(x) _ ## x 69# else 70# define _C_LABEL(x) _/**/x 71# endif 72#endif 73#define _ASM_LABEL(x) x 74 75#define CVAROFF(x, y) _C_LABEL(x) + y 76 77#ifdef __STDC__ 78# define __CONCAT(x,y) x ## y 79# define __STRING(x) #x 80#else 81# define __CONCAT(x,y) x/**/y 82# define __STRING(x) "x" 83#endif 84 85/* let kernels and others override entrypoint alignment */ 86#if !defined(_ALIGN_TEXT) && !defined(_KERNEL) 87# ifdef _STANDALONE 88# define _ALIGN_TEXT .align 1 89# elif defined __ELF__ 90# define _ALIGN_TEXT .align 16 91# else 92# define _ALIGN_TEXT .align 4 93# endif 94#endif 95 96#define _ENTRY(x) \ 97 .text; _ALIGN_TEXT; .globl x; .type x,@function; x: 98#define _LABEL(x) \ 99 .globl x; x: 100 101#ifdef _KERNEL 102 103#define CPUVAR(off) %fs:__CONCAT(CPU_INFO_,off) 104 105/* XXX Can't use __CONCAT() here, as it would be evaluated incorrectly. */ 106#ifdef __ELF__ 107#ifdef __STDC__ 108#define IDTVEC(name) \ 109 ALIGN_TEXT; .globl X ## name; .type X ## name,@function; X ## name: 110#define IDTVEC_END(name) \ 111 .size X ## name, . - X ## name 112#else 113#define IDTVEC(name) \ 114 ALIGN_TEXT; .globl X/**/name; .type X/**/name,@function; X/**/name: 115#define IDTVEC_END(name) \ 116 .size X/**/name, . - X/**/name 117#endif /* __STDC__ */ 118#else 119#ifdef __STDC__ 120#define IDTVEC(name) \ 121 ALIGN_TEXT; .globl _X ## name; .type _X ## name,@function; _X ## name: 122#define IDTVEC_END(name) \ 123 .size _X ## name, . - _X ## name 124#else 125#define IDTVEC(name) \ 126 ALIGN_TEXT; .globl _X/**/name; .type _X/**/name,@function; _X/**/name: 127#define IDTVEC_END(name) \ 128 .size _X/**/name, . - _X/**/name 129#endif /* __STDC__ */ 130#endif /* __ELF__ */ 131 132#ifdef _STANDALONE 133#define ALIGN_DATA .align 4 134#define ALIGN_TEXT .align 4 /* 4-byte boundaries */ 135#define SUPERALIGN_TEXT .align 16 /* 15-byte boundaries */ 136#elif defined __ELF__ 137#define ALIGN_DATA .align 4 138#define ALIGN_TEXT .align 16 /* 16-byte boundaries */ 139#define SUPERALIGN_TEXT .align 16 /* 16-byte boundaries */ 140#else 141#define ALIGN_DATA .align 2 142#define ALIGN_TEXT .align 4 /* 16-byte boundaries */ 143#define SUPERALIGN_TEXT .align 4 /* 16-byte boundaries */ 144#endif /* __ELF__ */ 145 146#define _ALIGN_TEXT ALIGN_TEXT 147 148#ifdef GPROF 149#ifdef __ELF__ 150#define MCOUNT_ASM call _C_LABEL(__mcount) 151#else /* __ELF__ */ 152#define MCOUNT_ASM call _C_LABEL(mcount) 153#endif /* __ELF__ */ 154#else /* GPROF */ 155#define MCOUNT_ASM /* nothing */ 156#endif /* GPROF */ 157 158#endif /* _KERNEL */ 159 160 161 162#ifdef GPROF 163# ifdef __ELF__ 164# define _PROF_PROLOGUE \ 165 pushl %ebp; movl %esp,%ebp; call PIC_PLT(__mcount); popl %ebp 166# else 167# define _PROF_PROLOGUE \ 168 pushl %ebp; movl %esp,%ebp; call PIC_PLT(mcount); popl %ebp 169# endif 170#else 171# define _PROF_PROLOGUE 172#endif 173 174#define ENTRY(y) _ENTRY(_C_LABEL(y)); _PROF_PROLOGUE 175#define NENTRY(y) _ENTRY(_C_LABEL(y)) 176#define ASENTRY(y) _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE 177#define LABEL(y) _LABEL(_C_LABEL(y)) 178#define END(y) .size y, . - y 179 180#define ASMSTR .asciz 181 182#ifdef __ELF__ 183#define RCSID(x) .pushsection ".ident"; .asciz x; .popsection 184#else 185#define RCSID(x) .text; .asciz x 186#endif 187 188#ifdef NO_KERNEL_RCSIDS 189#define __KERNEL_RCSID(_n, _s) /* nothing */ 190#else 191#define __KERNEL_RCSID(_n, _s) RCSID(_s) 192#endif 193 194#ifdef __ELF__ 195#define WEAK_ALIAS(alias,sym) \ 196 .weak alias; \ 197 alias = sym 198#endif 199/* 200 * STRONG_ALIAS: create a strong alias. 201 */ 202#define STRONG_ALIAS(alias,sym) \ 203 .globl alias; \ 204 alias = sym 205 206#ifdef __STDC__ 207#define WARN_REFERENCES(sym,msg) \ 208 .pushsection .gnu.warning. ## sym; \ 209 .ascii msg; \ 210 .popsection 211#else 212#define WARN_REFERENCES(sym,msg) \ 213 .pushsection .gnu.warning./**/sym; \ 214 .ascii msg; \ 215 .popsection 216#endif /* __STDC__ */ 217 218#endif /* !_I386_ASM_H_ */ 219