| 1 | /*-
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| 2 | * Copyright (c) 1990 The Regents of the University of California.
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * This code is derived from software contributed to Berkeley by
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| 6 | * William Jolitz.
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| 7 | *
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| 8 | * Redistribution and use in source and binary forms, with or without
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| 9 | * modification, are permitted provided that the following conditions
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| 10 | * are met:
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| 11 | * 1. Redistributions of source code must retain the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer.
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer in the
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| 15 | * documentation and/or other materials provided with the distribution.
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| 16 | * 3. All advertising materials mentioning features or use of this software
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| 17 | * must display the following acknowledgement:
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| 18 | * This product includes software developed by the University of
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| 19 | * California, Berkeley and its contributors.
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| 20 | * 4. Neither the name of the University nor the names of its contributors
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| 21 | * may be used to endorse or promote products derived from this software
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| 22 | * without specific prior written permission.
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| 23 | *
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| 24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 34 | * SUCH DAMAGE.
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| 35 | *
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| 36 | * from: @(#)DEFS.h 5.1 (Berkeley) 4/23/90
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| 37 | * $FreeBSD: src/sys/i386/include/asm.h,v 1.10 2002/09/23 07:27:45 peter Exp $
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| 38 | */
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| 39 |
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| 40 | #ifndef _MACHINE_ASM_H_
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| 41 | #define _MACHINE_ASM_H_
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| 42 |
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| 43 | #include <sys/cdefs.h>
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| 44 |
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| 45 | #ifdef PIC
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| 46 | #define PIC_PROLOGUE \
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| 47 | pushl %ebx; \
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| 48 | call 1f; \
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| 49 | 1: \
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| 50 | popl %ebx; \
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| 51 | addl $_GLOBAL_OFFSET_TABLE_+[.-1b],%ebx
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| 52 | #define PIC_EPILOGUE \
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| 53 | popl %ebx
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| 54 | #define PIC_PLT(x) x@PLT
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| 55 | #define PIC_GOT(x) x@GOT(%ebx)
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| 56 | #else
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| 57 | #define PIC_PROLOGUE
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| 58 | #define PIC_EPILOGUE
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| 59 | #define PIC_PLT(x) x
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| 60 | #define PIC_GOT(x) x
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| 61 | #endif
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| 62 |
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| 63 | /*
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| 64 | * CNAME and HIDENAME manage the relationship between symbol names in C
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| 65 | * and the equivalent assembly language names. CNAME is given a name as
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| 66 | * it would be used in a C program. It expands to the equivalent assembly
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| 67 | * language name. HIDENAME is given an assembly-language name, and expands
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| 68 | * to a possibly-modified form that will be invisible to C programs.
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| 69 | */
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| 70 | #define CNAME(csym) __CONCAT(_,csym) /* bird, we need underscore */
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| 71 | #define STDCNAME(csym) __CONCAT(__std_,csym) /* bird, same as _STD() */
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| 72 | #define HIDENAME(asmsym) __CONCAT(.,asmsym)
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| 73 |
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| 74 | /* XXX should use .p2align 4,0x90 for -m486. */
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| 75 | /*#define _START_ENTRY .text; .p2align 2,0x90*/
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| 76 | #define _START_ENTRY .text; .p2align 4,0xcc /* bird */
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| 77 |
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| 78 | #define _ENTRY(x) _START_ENTRY; \
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| 79 | .globl CNAME(x); .type CNAME(x),@function; CNAME(x):
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| 80 |
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| 81 | #ifdef PROF
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| 82 | #define ALTENTRY(x) _ENTRY(x); \
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| 83 | pushl %ebp; movl %esp,%ebp; \
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| 84 | call PIC_PLT(HIDENAME(mcount)); \
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| 85 | popl %ebp; \
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| 86 | jmp 9f
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| 87 | #define ENTRY(x) _ENTRY(x); \
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| 88 | pushl %ebp; movl %esp,%ebp; \
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| 89 | call PIC_PLT(HIDENAME(mcount)); \
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| 90 | popl %ebp; \
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| 91 | 9:
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| 92 | #else
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| 93 | #define ALTENTRY(x) _ENTRY(x)
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| 94 | #define ENTRY(x) _ENTRY(x)
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| 95 | #endif
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| 96 | #define STDENTRY(x) ENTRY(__CONCAT(_std_,x)) /* libc */
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| 97 |
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| 98 |
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| 99 | #define RCSID(x) .text; .asciz x
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| 100 |
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| 101 | #undef __FBSDID
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| 102 | #if !defined(lint) && !defined(STRIP_FBSDID)
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| 103 | #define __FBSDID(s) .ident s
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| 104 | #else
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| 105 | #define __FBSDID(s) /* nothing */
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| 106 | #endif /* not lint and not STRIP_FBSDID */
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| 107 |
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| 108 | #ifdef _ARCH_INDIRECT
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| 109 | /*
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| 110 | * Generate code to select between the generic functions and _ARCH_INDIRECT
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| 111 | * specific ones.
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| 112 | * XXX nested __CONCATs don't work with non-ANSI cpp's.
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| 113 | */
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| 114 | #define ANAME(x) CNAME(__CONCAT(__CONCAT(__,_ARCH_INDIRECT),x))
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| 115 | #define ASELNAME(x) CNAME(__CONCAT(__arch_select_,x))
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| 116 | #define AVECNAME(x) CNAME(__CONCAT(__arch_,x))
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| 117 | #define GNAME(x) CNAME(__CONCAT(__generic_,x))
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| 118 |
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| 119 | /* Don't bother profiling this. */
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| 120 | #ifdef PIC
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| 121 | #define ARCH_DISPATCH(x) \
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| 122 | _START_ENTRY; \
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| 123 | .globl CNAME(x); .type CNAME(x),@function; CNAME(x): ; \
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| 124 | PIC_PROLOGUE; \
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| 125 | movl PIC_GOT(AVECNAME(x)),%eax; \
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| 126 | PIC_EPILOGUE; \
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| 127 | jmpl *(%eax)
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| 128 |
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| 129 | #define ARCH_SELECT(x) _START_ENTRY; \
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| 130 | .type ASELNAME(x),@function; \
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| 131 | ASELNAME(x): \
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| 132 | PIC_PROLOGUE; \
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| 133 | call PIC_PLT(CNAME(__get_hw_float)); \
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| 134 | testl %eax,%eax; \
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| 135 | movl PIC_GOT(ANAME(x)),%eax; \
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| 136 | jne 8f; \
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| 137 | movl PIC_GOT(GNAME(x)),%eax; \
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| 138 | 8: \
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| 139 | movl PIC_GOT(AVECNAME(x)),%edx; \
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| 140 | movl %eax,(%edx); \
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| 141 | PIC_EPILOGUE; \
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| 142 | jmpl *%eax
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| 143 | #else /* !PIC */
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| 144 | #define ARCH_DISPATCH(x) \
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| 145 | _START_ENTRY; \
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| 146 | .globl CNAME(x); .type CNAME(x),@function; CNAME(x): ; \
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| 147 | jmpl *AVECNAME(x)
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| 148 |
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| 149 | #define ARCH_SELECT(x) _START_ENTRY; \
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| 150 | .type ASELNAME(x),@function; \
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| 151 | ASELNAME(x): \
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| 152 | call CNAME(__get_hw_float); \
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| 153 | testl %eax,%eax; \
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| 154 | movl $ANAME(x),%eax; \
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| 155 | jne 8f; \
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| 156 | movl $GNAME(x),%eax; \
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| 157 | 8: \
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| 158 | movl %eax,AVECNAME(x); \
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| 159 | jmpl *%eax
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| 160 | #endif /* PIC */
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| 161 |
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| 162 | #define ARCH_VECTOR(x) .data; .p2align 2; \
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| 163 | .globl AVECNAME(x); \
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| 164 | .type AVECNAME(x),@object; \
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| 165 | .size AVECNAME(x),4; \
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| 166 | AVECNAME(x): .long ASELNAME(x)
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| 167 |
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| 168 | #undef _ENTRY
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| 169 | #define _ENTRY(x) ARCH_VECTOR(x); ARCH_SELECT(x); ARCH_DISPATCH(x); \
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| 170 | _START_ENTRY; \
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| 171 | .globl ANAME(x); .type ANAME(x),@function; ANAME(x):
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| 172 |
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| 173 | #endif /* _ARCH_INDIRECT */
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| 174 |
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| 175 | #endif /* !_MACHINE_ASM_H_ */
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