1 /* $NetBSD: asm.h,v 1.30 2006/01/20 22:02:40 christos 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 __ELF__ 88 # define _ALIGN_TEXT .align 4 89 # else 90 # define _ALIGN_TEXT .align 2 91 # endif 92 #endif 93 94 #define _ENTRY(x) \ 95 .text; _ALIGN_TEXT; .globl x; .type x,@function; x: 96 97 #ifdef _KERNEL 98 99 #if defined(MULTIPROCESSOR) 100 #define CPUVAR(off) %fs:__CONCAT(CPU_INFO_,off) 101 #else 102 #define CPUVAR(off) _C_LABEL(cpu_info_primary)+__CONCAT(CPU_INFO_,off) 103 #endif /* MULTIPROCESSOR */ 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 #else 111 #define IDTVEC(name) \ 112 ALIGN_TEXT; .globl X/**/name; .type X/**/name,@function; X/**/name: 113 #endif /* __STDC__ */ 114 #else 115 #ifdef __STDC__ 116 #define IDTVEC(name) \ 117 ALIGN_TEXT; .globl _X ## name; .type _X ## name,@function; _X ## name: 118 #else 119 #define IDTVEC(name) \ 120 ALIGN_TEXT; .globl _X/**/name; .type _X/**/name,@function; _X/**/name: 121 #endif /* __STDC__ */ 122 #endif /* __ELF__ */ 123 124 #ifdef __ELF__ 125 #define ALIGN_DATA .align 4 126 #define ALIGN_TEXT .align 4,0x90 /* 4-byte boundaries, NOP-filled */ 127 #define SUPERALIGN_TEXT .align 16,0x90 /* 16-byte boundaries better for 486 */ 128 #else 129 #define ALIGN_DATA .align 2 130 #define ALIGN_TEXT .align 2,0x90 /* 4-byte boundaries, NOP-filled */ 131 #define SUPERALIGN_TEXT .align 4,0x90 /* 16-byte boundaries better for 486 */ 132 #endif /* __ELF__ */ 133 134 #define _ALIGN_TEXT ALIGN_TEXT 135 136 #ifdef GPROF 137 #ifdef __ELF__ 138 #define MCOUNT_ASM call _C_LABEL(__mcount) 139 #else /* __ELF__ */ 140 #define MCOUNT_ASM call _C_LABEL(mcount) 141 #endif /* __ELF__ */ 142 #else /* GPROF */ 143 #define MCOUNT_ASM /* nothing */ 144 #endif /* GPROF */ 145 146 #endif /* _KERNEL */ 147 148 149 150 #ifdef GPROF 151 # ifdef __ELF__ 152 # define _PROF_PROLOGUE \ 153 pushl %ebp; movl %esp,%ebp; call PIC_PLT(__mcount); popl %ebp 154 # else 155 # define _PROF_PROLOGUE \ 156 pushl %ebp; movl %esp,%ebp; call PIC_PLT(mcount); popl %ebp 157 # endif 158 #else 159 # define _PROF_PROLOGUE 160 #endif 161 162 #define ENTRY(y) _ENTRY(_C_LABEL(y)); _PROF_PROLOGUE 163 #define NENTRY(y) _ENTRY(_C_LABEL(y)) 164 #define ASENTRY(y) _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE 165 166 #define ASMSTR .asciz 167 168 #ifdef __ELF__ 169 #define RCSID(x) .section ".ident"; .asciz x 170 #else 171 #define RCSID(x) .text; .asciz x 172 #endif 173 174 #ifdef NO_KERNEL_RCSIDS 175 #define __KERNEL_RCSID(_n, _s) /* nothing */ 176 #else 177 #define __KERNEL_RCSID(_n, _s) RCSID(_s) 178 #endif 179 180 #ifdef __ELF__ 181 #define WEAK_ALIAS(alias,sym) \ 182 .weak alias; \ 183 alias = sym 184 #endif 185 /* 186 * STRONG_ALIAS: create a strong alias. 187 */ 188 #define STRONG_ALIAS(alias,sym) \ 189 .globl alias; \ 190 alias = sym 191 192 #ifdef __STDC__ 193 #define WARN_REFERENCES(sym,msg) \ 194 .stabs msg ## ,30,0,0,0 ; \ 195 .stabs __STRING(_C_LABEL(sym)) ## ,1,0,0,0 196 #elif defined(__ELF__) 197 #define WARN_REFERENCES(sym,msg) \ 198 .stabs msg,30,0,0,0 ; \ 199 .stabs __STRING(sym),1,0,0,0 200 #else 201 #define WARN_REFERENCES(sym,msg) \ 202 .stabs msg,30,0,0,0 ; \ 203 .stabs __STRING(_/**/sym),1,0,0,0 204 #endif /* __STDC__ */ 205 206 207 208 #endif /* !_I386_ASM_H_ */ 209
