1 /* $NetBSD: asm.h,v 1.40 2011/06/16 13:16:20 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; \ 48 1: \ 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 #if defined(__ELF__) || defined(__minix) 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 #ifdef __minix 219 #define IMPORT(sym) \ 220 .extern _C_LABEL(sym) 221 #endif 222 223 #endif /* !_I386_ASM_H_ */ 224