asm.h revision 103850
1/*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)DEFS.h 5.1 (Berkeley) 4/23/90 37 * $FreeBSD: head/sys/i386/include/asm.h 103850 2002-09-23 07:27:45Z peter $ 38 */ 39 40#ifndef _MACHINE_ASM_H_ 41#define _MACHINE_ASM_H_ 42 43#include <sys/cdefs.h> 44 45#ifdef PIC 46#define PIC_PROLOGUE \ 47 pushl %ebx; \ 48 call 1f; \ 491: \ 50 popl %ebx; \ 51 addl $_GLOBAL_OFFSET_TABLE_+[.-1b],%ebx 52#define PIC_EPILOGUE \ 53 popl %ebx 54#define PIC_PLT(x) x@PLT 55#define PIC_GOT(x) x@GOT(%ebx) 56#else 57#define PIC_PROLOGUE 58#define PIC_EPILOGUE 59#define PIC_PLT(x) x 60#define PIC_GOT(x) x 61#endif 62 63/* 64 * CNAME and HIDENAME manage the relationship between symbol names in C 65 * and the equivalent assembly language names. CNAME is given a name as 66 * it would be used in a C program. It expands to the equivalent assembly 67 * language name. HIDENAME is given an assembly-language name, and expands 68 * to a possibly-modified form that will be invisible to C programs. 69 */ 70#define CNAME(csym) csym 71#define HIDENAME(asmsym) __CONCAT(.,asmsym) 72 73/* XXX should use .p2align 4,0x90 for -m486. */ 74#define _START_ENTRY .text; .p2align 2,0x90 75 76#define _ENTRY(x) _START_ENTRY; \ 77 .globl CNAME(x); .type CNAME(x),@function; CNAME(x): 78 79#ifdef PROF 80#define ALTENTRY(x) _ENTRY(x); \ 81 pushl %ebp; movl %esp,%ebp; \ 82 call PIC_PLT(HIDENAME(mcount)); \ 83 popl %ebp; \ 84 jmp 9f 85#define ENTRY(x) _ENTRY(x); \ 86 pushl %ebp; movl %esp,%ebp; \ 87 call PIC_PLT(HIDENAME(mcount)); \ 88 popl %ebp; \ 89 9: 90#else 91#define ALTENTRY(x) _ENTRY(x) 92#define ENTRY(x) _ENTRY(x) 93#endif 94 95#define RCSID(x) .text; .asciz x 96 97#undef __FBSDID 98#if !defined(lint) && !defined(STRIP_FBSDID) 99#define __FBSDID(s) .ident s 100#else 101#define __FBSDID(s) /* nothing */ 102#endif /* not lint and not STRIP_FBSDID */ 103 104#ifdef _ARCH_INDIRECT 105/* 106 * Generate code to select between the generic functions and _ARCH_INDIRECT 107 * specific ones. 108 * XXX nested __CONCATs don't work with non-ANSI cpp's. 109 */ 110#define ANAME(x) CNAME(__CONCAT(__CONCAT(__,_ARCH_INDIRECT),x)) 111#define ASELNAME(x) CNAME(__CONCAT(__arch_select_,x)) 112#define AVECNAME(x) CNAME(__CONCAT(__arch_,x)) 113#define GNAME(x) CNAME(__CONCAT(__generic_,x)) 114 115/* Don't bother profiling this. */ 116#ifdef PIC 117#define ARCH_DISPATCH(x) \ 118 _START_ENTRY; \ 119 .globl CNAME(x); .type CNAME(x),@function; CNAME(x): ; \ 120 PIC_PROLOGUE; \ 121 movl PIC_GOT(AVECNAME(x)),%eax; \ 122 PIC_EPILOGUE; \ 123 jmpl *(%eax) 124 125#define ARCH_SELECT(x) _START_ENTRY; \ 126 .type ASELNAME(x),@function; \ 127 ASELNAME(x): \ 128 PIC_PROLOGUE; \ 129 call PIC_PLT(CNAME(__get_hw_float)); \ 130 testl %eax,%eax; \ 131 movl PIC_GOT(ANAME(x)),%eax; \ 132 jne 8f; \ 133 movl PIC_GOT(GNAME(x)),%eax; \ 134 8: \ 135 movl PIC_GOT(AVECNAME(x)),%edx; \ 136 movl %eax,(%edx); \ 137 PIC_EPILOGUE; \ 138 jmpl *%eax 139#else /* !PIC */ 140#define ARCH_DISPATCH(x) \ 141 _START_ENTRY; \ 142 .globl CNAME(x); .type CNAME(x),@function; CNAME(x): ; \ 143 jmpl *AVECNAME(x) 144 145#define ARCH_SELECT(x) _START_ENTRY; \ 146 .type ASELNAME(x),@function; \ 147 ASELNAME(x): \ 148 call CNAME(__get_hw_float); \ 149 testl %eax,%eax; \ 150 movl $ANAME(x),%eax; \ 151 jne 8f; \ 152 movl $GNAME(x),%eax; \ 153 8: \ 154 movl %eax,AVECNAME(x); \ 155 jmpl *%eax 156#endif /* PIC */ 157 158#define ARCH_VECTOR(x) .data; .p2align 2; \ 159 .globl AVECNAME(x); \ 160 .type AVECNAME(x),@object; \ 161 .size AVECNAME(x),4; \ 162 AVECNAME(x): .long ASELNAME(x) 163 164#undef _ENTRY 165#define _ENTRY(x) ARCH_VECTOR(x); ARCH_SELECT(x); ARCH_DISPATCH(x); \ 166 _START_ENTRY; \ 167 .globl ANAME(x); .type ANAME(x),@function; ANAME(x): 168 169#endif /* _ARCH_INDIRECT */ 170 171#endif /* !_MACHINE_ASM_H_ */ 172