sys/arch/i386/include/asm.h

   1 /*      $NetBSD: asm.h,v 1.39 2010/12/20 21:11:24 joerg 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 _STANDALONE
  88 #  define _ALIGN_TEXT .align 4
  89 # elif defined __ELF__
  90 #  define _ALIGN_TEXT .align 16
  91 # else
  92 #  define _ALIGN_TEXT .align 4
  93 # endif
  94 #endif
  95
  96 #define _ENTRY(x) \
  97         .text; _ALIGN_TEXT; .globl x; .type x,@function; x:
  98 #define _LABEL(x) \
  99         .globl x; x:
 100
 101 #ifdef _KERNEL
 102
 103 #define CPUVAR(off) %fs:__CONCAT(CPU_INFO_,off)
 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 #define IDTVEC_END(name) \
 111         .size X ## name, . - X ## name
 112 #else
 113 #define IDTVEC(name) \
 114         ALIGN_TEXT; .globl X/**/name; .type X/**/name,@function; X/**/name:
 115 #define IDTVEC_END(name) \
 116         .size X/**/name, . - X/**/name
 117 #endif /* __STDC__ */
 118 #else
 119 #ifdef __STDC__
 120 #define IDTVEC(name) \
 121         ALIGN_TEXT; .globl _X ## name; .type _X ## name,@function; _X ## name:
 122 #define IDTVEC_END(name) \
 123         .size _X ## name, . - _X ## name
 124 #else
 125 #define IDTVEC(name) \
 126         ALIGN_TEXT; .globl _X/**/name; .type _X/**/name,@function; _X/**/name:
 127 #define IDTVEC_END(name) \
 128         .size _X/**/name, . - _X/**/name
 129 #endif /* __STDC__ */
 130 #endif /* __ELF__ */
 131
 132 #ifdef _STANDALONE
 133 #define ALIGN_DATA      .align  4
 134 #define ALIGN_TEXT      .align  4       /* 4-byte boundaries */
 135 #define SUPERALIGN_TEXT .align  16      /* 15-byte boundaries */
 136 #elif defined __ELF__
 137 #define ALIGN_DATA      .align  4
 138 #define ALIGN_TEXT      .align  16      /* 16-byte boundaries */
 139 #define SUPERALIGN_TEXT .align  16      /* 16-byte boundaries */
 140 #else
 141 #define ALIGN_DATA      .align  2
 142 #define ALIGN_TEXT      .align  4       /* 16-byte boundaries */
 143 #define SUPERALIGN_TEXT .align  4       /* 16-byte boundaries */
 144 #endif /* __ELF__ */
 145
 146 #define _ALIGN_TEXT ALIGN_TEXT
 147
 148 #ifdef GPROF
 149 #ifdef __ELF__
 150 #define MCOUNT_ASM      call    _C_LABEL(__mcount)
 151 #else /* __ELF__ */
 152 #define MCOUNT_ASM      call    _C_LABEL(mcount)
 153 #endif /* __ELF__ */
 154 #else /* GPROF */
 155 #define MCOUNT_ASM      /* nothing */
 156 #endif /* GPROF */
 157
 158 #endif /* _KERNEL */
 159
 160
 161
 162 #ifdef GPROF
 163 # ifdef __ELF__
 164 #  define _PROF_PROLOGUE        \
 165         pushl %ebp; movl %esp,%ebp; call PIC_PLT(__mcount); popl %ebp
 166 # else
 167 #  define _PROF_PROLOGUE        \
 168         pushl %ebp; movl %esp,%ebp; call PIC_PLT(mcount); popl %ebp
 169 # endif
 170 #else
 171 # define _PROF_PROLOGUE
 172 #endif
 173
 174 #define ENTRY(y)        _ENTRY(_C_LABEL(y)); _PROF_PROLOGUE
 175 #define NENTRY(y)       _ENTRY(_C_LABEL(y))
 176 #define ASENTRY(y)      _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
 177 #define LABEL(y)        _LABEL(_C_LABEL(y))
 178 #define END(y)          .size y, . - y
 179
 180 #define ASMSTR          .asciz
 181
 182 #ifdef __ELF__
 183 #define RCSID(x)        .pushsection ".ident"; .asciz x; .popsection
 184 #else
 185 #define RCSID(x)        .text; .asciz x
 186 #endif
 187
 188 #ifdef NO_KERNEL_RCSIDS
 189 #define __KERNEL_RCSID(_n, _s)  /* nothing */
 190 #else
 191 #define __KERNEL_RCSID(_n, _s)  RCSID(_s)
 192 #endif
 193
 194 #if defined(__ELF__) || defined(__minix)
 195 #define WEAK_ALIAS(alias,sym)                                           \
 196         .weak alias;                                                    \
 197         alias = sym
 198 #endif
 199 /*
 200  * STRONG_ALIAS: create a strong alias.
 201  */
 202 #define STRONG_ALIAS(alias,sym)                                         \
 203         .globl alias;                                                   \
 204         alias = sym
 205
 206 #ifdef __STDC__
 207 #define WARN_REFERENCES(sym,msg)                                        \
 208         .pushsection .gnu.warning. ## sym;                              \
 209         .ascii msg;                                                     \
 210         .popsection
 211 #else
 212 #define WARN_REFERENCES(sym,msg)                                        \
 213         .pushsection .gnu.warning./**/sym;                              \
 214         .ascii msg;                                                     \
 215         .popsection
 216 #endif /* __STDC__ */
 217
 218 #ifdef __minix
 219 #define IMPORT(sym)               \
 220         .extern _C_LABEL(sym)
 221
 222 #define KERVEC_ORIG 32     /* syscall trap to kernel */
 223 #define IPCVEC_ORIG 33     /* ipc trap to kernel  */
 224
 225 #define KERVEC_UM 34     /* syscall trap to kernel, user-mapped code */
 226 #define IPCVEC_UM 35     /* ipc trap to kernel, user-mapped code  */
 227
 228 #endif
 229
 230 #endif /* !_I386_ASM_H_ */