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  * 4. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  *      from: @(#)DEFS.h        5.1 (Berkeley) 4/23/90
  33  * $FreeBSD: src/sys/i386/include/asm.h,v 1.7 2000/01/25 09:01:55 bde Exp $
  34  * $DragonFly: src/sys/cpu/i386/include/asm.h,v 1.4 2006/11/07 06:43:22 dillon Exp $
  35  */
  36
  37 #ifndef _CPU_ASM_H_
  38 #define _CPU_ASM_H_
  39
  40 #include <sys/cdefs.h>
  41
  42 #ifdef PIC
  43 #define PIC_PROLOGUE    \
  44         pushl   %ebx;   \
  45         call    1f;     \
  46 1:                      \
  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 #define CNAME(csym)             csym
  70 #define HIDENAME(asmsym)        .asmsym
  71
  72 /* XXX should use .p2align 4,0x90 for -m486. */
  73 #define _START_ENTRY    .text; .p2align 2,0x90
  74
  75 #define _ENTRY(x)       _START_ENTRY; \
  76                         .globl CNAME(x); .type CNAME(x),@function; CNAME(x):
  77 #define END(x)          .size x, . - x
  78
  79 #ifdef PROF
  80 #define ALTENTRY(x)     _ENTRY(x); \
  81                         pushl %ebp; movl %esp,%ebp; \
  82                         call PIC_PLT(HIDENAME(mcount)); \
  83                         popl %ebp; \
  84                         jmp 9f
  85 #define ENTRY(x)        _ENTRY(x); \
  86                         pushl %ebp; movl %esp,%ebp; \
  87                         call PIC_PLT(HIDENAME(mcount)); \
  88                         popl %ebp; \
  89                         9:
  90 #else
  91 #define ALTENTRY(x)     _ENTRY(x)
  92 #define ENTRY(x)        _ENTRY(x)
  93 #endif
  94
  95 #define RCSID(x)        .text; .asciz x
  96
  97 #endif /* !_CPU_ASM_H_ */