asm.h revision 23576
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 * $Id: asm.h,v 1.1 1997/03/09 10:39:15 bde Exp $ 38 */ 39 40#include <sys/cdefs.h> 41 42#ifdef PIC 43#define PIC_PROLOGUE \ 44 pushl %ebx; \ 45 call 1f; \ 461: \ 47 popl %ebx; \ 48 addl $_GLOBAL_OFFSET_TABLE_+[.-1b],%ebx 49#define PIC_EPILOGUE \ 50 popl %ebx 51#define PIC_PLT(x) x@PLT 52#define PIC_GOT(x) x@GOT(%ebx) 53#define PIC_GOTOFF(x) x@GOTOFF(%ebx) 54#else 55#define PIC_PROLOGUE 56#define PIC_EPILOGUE 57#define PIC_PLT(x) x 58#define PIC_GOT(x) x 59#define PIC_GOTOFF(x) x 60#endif 61 62/* 63 * CNAME and HIDENAME manage the relationship between symbol names in C 64 * and the equivalent assembly language names. CNAME is given a name as 65 * it would be used in a C program. It expands to the equivalent assembly 66 * language name. HIDENAME is given an assembly-language name, and expands 67 * to a possibly-modified form that will be invisible to C programs. 68 */ 69#if defined(__ELF__) /* { */ 70#define CNAME(csym) csym 71#define HIDENAME(asmsym) __CONCAT(.,asmsym) 72#else /* } { */ 73#define CNAME(csym) __CONCAT(_,csym) 74#define HIDENAME(asmsym) asmsym 75#endif /* } */ 76 77 78/* XXX should use align 4,0x90 for -m486. */ 79#define _START_ENTRY .text; .align 2,0x90; 80#if 0 81/* Data is not used, except perhaps by non-g prof, which we don't support. */ 82#define _MID_ENTRY .data; .align 2; 8:; .long 0; \ 83 .text; lea 8b,%eax; 84#else 85#define _MID_ENTRY 86#endif 87 88#ifdef PROF 89 90#define ALTENTRY(x) _START_ENTRY \ 91 .globl CNAME(x); .type CNAME(x),@function; CNAME(x):; \ 92 _MID_ENTRY \ 93 call HIDENAME(mcount); jmp 9f 94 95#define ENTRY(x) _START_ENTRY \ 96 .globl CNAME(x); .type CNAME(x),@function; CNAME(x):; \ 97 _MID_ENTRY \ 98 call HIDENAME(mcount); 9: 99 100 101#define ALTASENTRY(x) _START_ENTRY \ 102 .globl x; .type x,@function; x:; \ 103 _MID_ENTRY \ 104 call HIDENAME(mcount); jmp 9f 105 106#define ASENTRY(x) _START_ENTRY \ 107 .globl x; .type x,@function; x:; \ 108 _MID_ENTRY \ 109 call HIDENAME(mcount); 9: 110 111#else /* !PROF */ 112 113#define ENTRY(x) _START_ENTRY .globl CNAME(x); .type CNAME(x),@function; \ 114 CNAME(x): 115#define ALTENTRY(x) ENTRY(x) 116 117#define ASENTRY(x) _START_ENTRY .globl x; .type x,@function; x: 118#define ALTASENTRY(x) ASENTRY(x) 119 120#endif 121 122/* 123 * This header is currently only used in lib/msun/i387. 124 * Use it to generate code to select between the generic math functions 125 * and the i387 ones. 126 */ 127#undef ENTRY 128#define ANAME(x) CNAME(__CONCAT(__i387_,x)) 129#define ASELNAME(x) CNAME(__CONCAT(__arch_select_,x)) 130#define AVECNAME(x) CNAME(__CONCAT(__arch_,x)) 131#define GNAME(x) CNAME(__CONCAT(__generic_,x)) 132 133/* Don't bother profiling this. */ 134#ifdef PIC 135#define ARCH_DISPATCH(x) \ 136 _START_ENTRY; \ 137 .globl CNAME(x); .type CNAME(x),@function; CNAME(x): ; \ 138 PIC_PROLOGUE; \ 139 movl PIC_GOT(AVECNAME(x)),%eax; \ 140 PIC_EPILOGUE; \ 141 jmpl *(%eax) 142 143#define ARCH_SELECT(x) _START_ENTRY; \ 144 .type ASELNAME(x),@function; \ 145 ASELNAME(x): \ 146 PIC_PROLOGUE; \ 147 call PIC_PLT(CNAME(__get_hw_float)); \ 148 testl %eax,%eax; \ 149 movl PIC_GOT(ANAME(x)),%eax; \ 150 jne 8f; \ 151 movl PIC_GOT(GNAME(x)),%eax; \ 152 8: \ 153 movl PIC_GOT(AVECNAME(x)),%edx; \ 154 movl %eax,(%edx); \ 155 PIC_EPILOGUE; \ 156 jmpl *%eax 157#else /* !PIC */ 158#define ARCH_DISPATCH(x) \ 159 _START_ENTRY; \ 160 .globl CNAME(x); .type CNAME(x),@function; CNAME(x): ; \ 161 jmpl *AVECNAME(x) 162 163#define ARCH_SELECT(x) _START_ENTRY; \ 164 .type ASELNAME(x),@function; \ 165 ASELNAME(x): \ 166 call CNAME(__get_hw_float); \ 167 testl %eax,%eax; \ 168 movl $ANAME(x),%eax; \ 169 jne 8f; \ 170 movl $GNAME(x),%eax; \ 171 8: \ 172 movl %eax,AVECNAME(x); \ 173 jmpl *%eax 174#endif /* PIC */ 175 176#define ARCH_VECTOR(x) .data; .align 2; \ 177 .globl AVECNAME(x); \ 178 .type AVECNAME(x),@object; \ 179 .size AVECNAME(x),4; \ 180 AVECNAME(x): .long ASELNAME(x) 181 182#ifdef PROF 183 184#define ALTENTRY(x) ENTRY(x); jmp 9f 185#define ENTRY(x) ARCH_VECTOR(x); ARCH_SELECT(x); ARCH_DISPATCH(x); \ 186 _START_ENTRY; \ 187 .globl ANAME(x); .type ANAME(x),@function; ANAME(x):; \ 188 call HIDENAME(mcount); 9: 189 190#else /* !PROF */ 191 192#define ALTENTRY(x) ENTRY(x) 193#define ENTRY(x) ARCH_VECTOR(x); ARCH_SELECT(x); ARCH_DISPATCH(x); \ 194 _START_ENTRY; \ 195 .globl ANAME(x); .type ANAME(x),@function; ANAME(x): 196 197#endif /* PROF */ 198 199#ifndef RCSID 200#define RCSID(a) 201#endif 202