StdLib/Include/Ia32/machine/asm.h

   1 /*      $NetBSD: asm.h,v 1.30 2006/01/20 22:02:40 christos Exp $        */
   2
   3 /*-
   4  * Copyright (c) 1990 The Regents of the University of California.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * William Jolitz.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  *      @(#)asm.h       5.5 (Berkeley) 5/7/91
  35  */
  36
  37 #ifndef _I386_ASM_H_
  38 #define _I386_ASM_H_
  39
  40 #ifdef _KERNEL_OPT
  41 #include "opt_multiprocessor.h"
  42 #endif
  43
  44 #ifdef PIC
  45 #define PIC_PROLOGUE    \
  46         pushl   %ebx;   \
  47         call    1f;     \
  48 1:                      \
  49         popl    %ebx;   \
  50         addl    $_GLOBAL_OFFSET_TABLE_+[.-1b], %ebx
  51 #define PIC_EPILOGUE    \
  52         popl    %ebx
  53 #define PIC_PLT(x)      x@PLT
  54 #define PIC_GOT(x)      x@GOT(%ebx)
  55 #define PIC_GOTOFF(x)   x@GOTOFF(%ebx)
  56 #else
  57 #define PIC_PROLOGUE
  58 #define PIC_EPILOGUE
  59 #define PIC_PLT(x)      x
  60 #define PIC_GOT(x)      x
  61 #define PIC_GOTOFF(x)   x
  62 #endif
  63
  64 #ifdef __ELF__
  65 # define _C_LABEL(x)    x
  66 #else
  67 # ifdef __STDC__
  68 #  define _C_LABEL(x)   _ ## x
  69 # else
  70 #  define _C_LABEL(x)   _/**/x
  71 # endif
  72 #endif
  73 #define _ASM_LABEL(x)   x
  74
  75 #define CVAROFF(x, y)           _C_LABEL(x) + y
  76
  77 #ifdef __STDC__
  78 # define __CONCAT(x,y)  x ## y
  79 # define __STRING(x)    #x
  80 #else
  81 # define __CONCAT(x,y)  x/**/y
  82 # define __STRING(x)    "x"
  83 #endif
  84
  85 /* let kernels and others override entrypoint alignment */
  86 #if !defined(_ALIGN_TEXT) && !defined(_KERNEL)
  87 # ifdef __ELF__
  88 #  define _ALIGN_TEXT .align 4
  89 # else
  90 #  define _ALIGN_TEXT .align 2
  91 # endif
  92 #endif
  93
  94 #define _ENTRY(x) \
  95         .text; _ALIGN_TEXT; .globl x; .type x,@function; x:
  96
  97 #ifdef _KERNEL
  98
  99 #if defined(MULTIPROCESSOR)
 100 #define CPUVAR(off) %fs:__CONCAT(CPU_INFO_,off)
 101 #else
 102 #define CPUVAR(off) _C_LABEL(cpu_info_primary)+__CONCAT(CPU_INFO_,off)
 103 #endif /* MULTIPROCESSOR */
 104
 105 /* XXX Can't use __CONCAT() here, as it would be evaluated incorrectly. */
 106 #ifdef __ELF__
 107 #ifdef __STDC__
 108 #define IDTVEC(name) \
 109         ALIGN_TEXT; .globl X ## name; .type X ## name,@function; X ## name:
 110 #else
 111 #define IDTVEC(name) \
 112         ALIGN_TEXT; .globl X/**/name; .type X/**/name,@function; X/**/name:
 113 #endif /* __STDC__ */
 114 #else
 115 #ifdef __STDC__
 116 #define IDTVEC(name) \
 117         ALIGN_TEXT; .globl _X ## name; .type _X ## name,@function; _X ## name:
 118 #else
 119 #define IDTVEC(name) \
 120         ALIGN_TEXT; .globl _X/**/name; .type _X/**/name,@function; _X/**/name:
 121 #endif /* __STDC__ */
 122 #endif /* __ELF__ */
 123
 124 #ifdef __ELF__
 125 #define ALIGN_DATA      .align  4
 126 #define ALIGN_TEXT      .align  4,0x90  /* 4-byte boundaries, NOP-filled */
 127 #define SUPERALIGN_TEXT .align  16,0x90 /* 16-byte boundaries better for 486 */
 128 #else
 129 #define ALIGN_DATA      .align  2
 130 #define ALIGN_TEXT      .align  2,0x90  /* 4-byte boundaries, NOP-filled */
 131 #define SUPERALIGN_TEXT .align  4,0x90  /* 16-byte boundaries better for 486 */
 132 #endif /* __ELF__ */
 133
 134 #define _ALIGN_TEXT ALIGN_TEXT
 135
 136 #ifdef GPROF
 137 #ifdef __ELF__
 138 #define MCOUNT_ASM      call    _C_LABEL(__mcount)
 139 #else /* __ELF__ */
 140 #define MCOUNT_ASM      call    _C_LABEL(mcount)
 141 #endif /* __ELF__ */
 142 #else /* GPROF */
 143 #define MCOUNT_ASM      /* nothing */
 144 #endif /* GPROF */
 145
 146 #endif /* _KERNEL */
 147
 148
 149
 150 #ifdef GPROF
 151 # ifdef __ELF__
 152 #  define _PROF_PROLOGUE        \
 153         pushl %ebp; movl %esp,%ebp; call PIC_PLT(__mcount); popl %ebp
 154 # else
 155 #  define _PROF_PROLOGUE        \
 156         pushl %ebp; movl %esp,%ebp; call PIC_PLT(mcount); popl %ebp
 157 # endif
 158 #else
 159 # define _PROF_PROLOGUE
 160 #endif
 161
 162 #define ENTRY(y)        _ENTRY(_C_LABEL(y)); _PROF_PROLOGUE
 163 #define NENTRY(y)       _ENTRY(_C_LABEL(y))
 164 #define ASENTRY(y)      _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
 165
 166 #define ASMSTR          .asciz
 167
 168 #ifdef __ELF__
 169 #define RCSID(x)        .section ".ident"; .asciz x
 170 #else
 171 #define RCSID(x)        .text; .asciz x
 172 #endif
 173
 174 #ifdef NO_KERNEL_RCSIDS
 175 #define __KERNEL_RCSID(_n, _s)  /* nothing */
 176 #else
 177 #define __KERNEL_RCSID(_n, _s)  RCSID(_s)
 178 #endif
 179
 180 #ifdef __ELF__
 181 #define WEAK_ALIAS(alias,sym)                                           \
 182         .weak alias;                                                    \
 183         alias = sym
 184 #endif
 185 /*
 186  * STRONG_ALIAS: create a strong alias.
 187  */
 188 #define STRONG_ALIAS(alias,sym)                                         \
 189         .globl alias;                                                   \
 190         alias = sym
 191
 192 #ifdef __STDC__
 193 #define WARN_REFERENCES(sym,msg)                                        \
 194         .stabs msg ## ,30,0,0,0 ;                                       \
 195         .stabs __STRING(_C_LABEL(sym)) ## ,1,0,0,0
 196 #elif defined(__ELF__)
 197 #define WARN_REFERENCES(sym,msg)                                        \
 198         .stabs msg,30,0,0,0 ;                                           \
 199         .stabs __STRING(sym),1,0,0,0
 200 #else
 201 #define WARN_REFERENCES(sym,msg)                                        \
 202         .stabs msg,30,0,0,0 ;                                           \
 203         .stabs __STRING(_/**/sym),1,0,0,0
 204 #endif /* __STDC__ */
 205
 206
 207
 208 #endif /* !_I386_ASM_H_ */