asm.h revision 103436
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/amd64/include/asm.h 103436 2002-09-17 01:49:00Z 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#define PIC_GOTOFF(x) x@GOTOFF(%ebx) 57#else 58#define PIC_PROLOGUE 59#define PIC_EPILOGUE 60#define PIC_PLT(x) x 61#define PIC_GOT(x) x 62#define PIC_GOTOFF(x) x 63#endif 64 65/* 66 * CNAME and HIDENAME manage the relationship between symbol names in C 67 * and the equivalent assembly language names. CNAME is given a name as 68 * it would be used in a C program. It expands to the equivalent assembly 69 * language name. HIDENAME is given an assembly-language name, and expands 70 * to a possibly-modified form that will be invisible to C programs. 71 */ 72#define CNAME(csym) csym 73#define HIDENAME(asmsym) __CONCAT(.,asmsym) 74 75/* XXX should use .p2align 4,0x90 for -m486. */ 76#define _START_ENTRY .text; .p2align 2,0x90 77 78#define _ENTRY(x) _START_ENTRY; \ 79 .globl CNAME(x); .type CNAME(x),@function; CNAME(x): 80 81#ifdef PROF 82#define ALTENTRY(x) _ENTRY(x); \ 83 pushl %ebp; movl %esp,%ebp; \ 84 call PIC_PLT(HIDENAME(mcount)); \ 85 popl %ebp; \ 86 jmp 9f 87#define ENTRY(x) _ENTRY(x); \ 88 pushl %ebp; movl %esp,%ebp; \ 89 call PIC_PLT(HIDENAME(mcount)); \ 90 popl %ebp; \ 91 9: 92#else 93#define ALTENTRY(x) _ENTRY(x) 94#define ENTRY(x) _ENTRY(x) 95#endif 96 97#define RCSID(x) .text; .asciz x 98 99#undef __FBSDID 100#if !defined(lint) && !defined(STRIP_FBSDID) 101#define __FBSDID(s) .ident s 102#else 103#define __FBSDID(s) /* nothing */ 104#endif /* not lint and not STRIP_FBSDID */ 105 106#ifdef _ARCH_INDIRECT 107/* 108 * Generate code to select between the generic functions and _ARCH_INDIRECT 109 * specific ones. 110 * XXX nested __CONCATs don't work with non-ANSI cpp's. 111 */ 112#define ANAME(x) CNAME(__CONCAT(__CONCAT(__,_ARCH_INDIRECT),x)) 113#define ASELNAME(x) CNAME(__CONCAT(__arch_select_,x)) 114#define AVECNAME(x) CNAME(__CONCAT(__arch_,x)) 115#define GNAME(x) CNAME(__CONCAT(__generic_,x)) 116 117/* Don't bother profiling this. */ 118#ifdef PIC 119#define ARCH_DISPATCH(x) \ 120 _START_ENTRY; \ 121 .globl CNAME(x); .type CNAME(x),@function; CNAME(x): ; \ 122 PIC_PROLOGUE; \ 123 movl PIC_GOT(AVECNAME(x)),%eax; \ 124 PIC_EPILOGUE; \ 125 jmpl *(%eax) 126 127#define ARCH_SELECT(x) _START_ENTRY; \ 128 .type ASELNAME(x),@function; \ 129 ASELNAME(x): \ 130 PIC_PROLOGUE; \ 131 call PIC_PLT(CNAME(__get_hw_float)); \ 132 testl %eax,%eax; \ 133 movl PIC_GOT(ANAME(x)),%eax; \ 134 jne 8f; \ 135 movl PIC_GOT(GNAME(x)),%eax; \ 136 8: \ 137 movl PIC_GOT(AVECNAME(x)),%edx; \ 138 movl %eax,(%edx); \ 139 PIC_EPILOGUE; \ 140 jmpl *%eax 141#else /* !PIC */ 142#define ARCH_DISPATCH(x) \ 143 _START_ENTRY; \ 144 .globl CNAME(x); .type CNAME(x),@function; CNAME(x): ; \ 145 jmpl *AVECNAME(x) 146 147#define ARCH_SELECT(x) _START_ENTRY; \ 148 .type ASELNAME(x),@function; \ 149 ASELNAME(x): \ 150 call CNAME(__get_hw_float); \ 151 testl %eax,%eax; \ 152 movl $ANAME(x),%eax; \ 153 jne 8f; \ 154 movl $GNAME(x),%eax; \ 155 8: \ 156 movl %eax,AVECNAME(x); \ 157 jmpl *%eax 158#endif /* PIC */ 159 160#define ARCH_VECTOR(x) .data; .p2align 2; \ 161 .globl AVECNAME(x); \ 162 .type AVECNAME(x),@object; \ 163 .size AVECNAME(x),4; \ 164 AVECNAME(x): .long ASELNAME(x) 165 166#undef _ENTRY 167#define _ENTRY(x) ARCH_VECTOR(x); ARCH_SELECT(x); ARCH_DISPATCH(x); \ 168 _START_ENTRY; \ 169 .globl ANAME(x); .type ANAME(x),@function; ANAME(x): 170 171#endif /* _ARCH_INDIRECT */ 172 173#endif /* !_MACHINE_ASM_H_ */ 174