sys/cpu/i386/include/asm.h

   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: src/sys/i386/include/asm.h,v 1.7 2000/01/25 09:01:55 bde Exp $
  38  * $DragonFly: src/sys/cpu/i386/include/asm.h,v 1.4 2006/11/07 06:43:22 dillon Exp $
  39  */
  40
  41 #ifndef _CPU_ASM_H_
  42 #define _CPU_ASM_H_
  43
  44 #include <sys/cdefs.h>
  45
  46 #ifdef PIC
  47 #define PIC_PROLOGUE    \
  48         pushl   %ebx;   \
  49         call    1f;     \
  50 1:                      \
  51         popl    %ebx;   \
  52         addl    $_GLOBAL_OFFSET_TABLE_+[.-1b],%ebx
  53 #define PIC_EPILOGUE    \
  54         popl    %ebx
  55 #define PIC_PLT(x)      x@PLT
  56 #define PIC_GOT(x)      x@GOT(%ebx)
  57 #define PIC_GOTOFF(x)   x@GOTOFF(%ebx)
  58 #else
  59 #define PIC_PROLOGUE
  60 #define PIC_EPILOGUE
  61 #define PIC_PLT(x)      x
  62 #define PIC_GOT(x)      x
  63 #define PIC_GOTOFF(x)   x
  64 #endif
  65
  66 /*
  67  * CNAME and HIDENAME manage the relationship between symbol names in C
  68  * and the equivalent assembly language names.  CNAME is given a name as
  69  * it would be used in a C program.  It expands to the equivalent assembly
  70  * language name.  HIDENAME is given an assembly-language name, and expands
  71  * to a possibly-modified form that will be invisible to C programs.
  72  */
  73 #define CNAME(csym)             csym
  74 #define HIDENAME(asmsym)        __CONCAT(.,asmsym)
  75
  76 /* XXX should use .p2align 4,0x90 for -m486. */
  77 #define _START_ENTRY    .text; .p2align 2,0x90
  78
  79 #define _ENTRY(x)       _START_ENTRY; \
  80                         .globl CNAME(x); .type CNAME(x),@function; CNAME(x):
  81
  82 #ifdef PROF
  83 #define ALTENTRY(x)     _ENTRY(x); \
  84                         pushl %ebp; movl %esp,%ebp; \
  85                         call PIC_PLT(HIDENAME(mcount)); \
  86                         popl %ebp; \
  87                         jmp 9f
  88 #define ENTRY(x)        _ENTRY(x); \
  89                         pushl %ebp; movl %esp,%ebp; \
  90                         call PIC_PLT(HIDENAME(mcount)); \
  91                         popl %ebp; \
  92                         9:
  93 #else
  94 #define ALTENTRY(x)     _ENTRY(x)
  95 #define ENTRY(x)        _ENTRY(x)
  96 #endif
  97
  98 #define RCSID(x)        .text; .asciz x
  99
 100 #ifdef _ARCH_INDIRECT
 101 /*
 102  * Generate code to select between the generic functions and _ARCH_INDIRECT
 103  * specific ones.
 104  * XXX nested __CONCATs don't work with non-ANSI cpp's.
 105  */
 106 #define ANAME(x)        CNAME(__CONCAT(__CONCAT(__,_ARCH_INDIRECT),x))
 107 #define ASELNAME(x)     CNAME(__CONCAT(__arch_select_,x))
 108 #define AVECNAME(x)     CNAME(__CONCAT(__arch_,x))
 109 #define GNAME(x)        CNAME(__CONCAT(__generic_,x))
 110
 111 /* Don't bother profiling this. */
 112 #ifdef PIC
 113 #define ARCH_DISPATCH(x) \
 114                         _START_ENTRY; \
 115                         .globl CNAME(x); .type CNAME(x),@function; CNAME(x): ; \
 116                         PIC_PROLOGUE; \
 117                         movl PIC_GOT(AVECNAME(x)),%eax; \
 118                         PIC_EPILOGUE; \
 119                         jmpl *(%eax)
 120
 121 #define ARCH_SELECT(x)  _START_ENTRY; \
 122                         .type ASELNAME(x),@function; \
 123                         ASELNAME(x): \
 124                         PIC_PROLOGUE; \
 125                         call PIC_PLT(CNAME(__get_hw_float)); \
 126                         testl %eax,%eax; \
 127                         movl PIC_GOT(ANAME(x)),%eax; \
 128                         jne 8f; \
 129                         movl PIC_GOT(GNAME(x)),%eax; \
 130                         8: \
 131                         movl PIC_GOT(AVECNAME(x)),%edx; \
 132                         movl %eax,(%edx); \
 133                         PIC_EPILOGUE; \
 134                         jmpl *%eax
 135 #else /* !PIC */
 136 #define ARCH_DISPATCH(x) \
 137                         _START_ENTRY; \
 138                         .globl CNAME(x); .type CNAME(x),@function; CNAME(x): ; \
 139                         jmpl *AVECNAME(x)
 140
 141 #define ARCH_SELECT(x)  _START_ENTRY; \
 142                         .type ASELNAME(x),@function; \
 143                         ASELNAME(x): \
 144                         call CNAME(__get_hw_float); \
 145                         testl %eax,%eax; \
 146                         movl $ANAME(x),%eax; \
 147                         jne 8f; \
 148                         movl $GNAME(x),%eax; \
 149                         8: \
 150                         movl %eax,AVECNAME(x); \
 151                         jmpl *%eax
 152 #endif /* PIC */
 153
 154 #define ARCH_VECTOR(x)  .data; .p2align 2; \
 155                         .globl AVECNAME(x); \
 156                         .type AVECNAME(x),@object; \
 157                         .size AVECNAME(x),4; \
 158                         AVECNAME(x): .long ASELNAME(x)
 159
 160 #undef _ENTRY
 161 #define _ENTRY(x)       ARCH_VECTOR(x); ARCH_SELECT(x); ARCH_DISPATCH(x); \
 162                         _START_ENTRY; \
 163                         .globl ANAME(x); .type ANAME(x),@function; ANAME(x):
 164
 165 #endif /* _ARCH_INDIRECT */
 166
 167 #endif /* !_CPU_ASM_H_ */