sys/cpu/x86_64/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. 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/amd64/include/asm.h,v 1.14 2003/06/02 05:59:35 peter Exp $
  34  */
  35
  36 #ifndef _CPU_ASM_H_
  37 #define _CPU_ASM_H_
  38
  39 #include <sys/cdefs.h>
  40
  41 #ifdef PIC
  42 #define PIC_PLT(x)      x@PLT
  43 #if defined(__x86_64__)
  44 #define PIC_GOT(x)      x@GOTPCREL(%rip)
  45 #else
  46 #define PIC_PROLOGUE    \
  47         pushl   %ebx;   \
  48         call    1f;     \
  49 1:                      \
  50         popl    %ebx;   \
  51         addl    $_GLOBAL_OFFSET_TABLE_+[.-1b],%ebx
  52 #define PIC_EPILOGUE    \
  53         popl    %ebx
  54 #define PIC_GOT(x)      x@GOT(%ebx)
  55 #define PIC_GOTOFF(x)   x@GOTOFF(%ebx)
  56 #endif
  57 #else
  58 #if !defined(__x86_64__)
  59 #define PIC_PROLOGUE
  60 #define PIC_EPILOGUE
  61 #define PIC_GOTOFF(x)   x
  62 #endif
  63 #define PIC_PLT(x)      x
  64 #define PIC_GOT(x)      x
  65 #endif
  66
  67 /*
  68  * CNAME and HIDENAME manage the relationship between symbol names in C
  69  * and the equivalent assembly language names.  CNAME is given a name as
  70  * it would be used in a C program.  It expands to the equivalent assembly
  71  * language name.  HIDENAME is given an assembly-language name, and expands
  72  * to a possibly-modified form that will be invisible to C programs.
  73  */
  74 #define CNAME(csym)             csym
  75 #define HIDENAME(asmsym)        .asmsym
  76
  77 #if defined(__x86_64__)
  78 #define _START_ENTRY    .text; .p2align 4,0x90
  79 #else
  80 /* XXX should use .p2align 4,0x90 for -m486. */
  81 #define _START_ENTRY    .text; .p2align 2,0x90
  82 #endif
  83
  84 #define _ENTRY(x)       _START_ENTRY; \
  85                         .globl CNAME(x); .type CNAME(x),@function; CNAME(x):
  86
  87 #ifdef PROF
  88 #if defined(__x86_64__)
  89 #define ALTENTRY(x)     _ENTRY(x); \
  90                         pushq %rbp; movq %rsp,%rbp; \
  91                         call PIC_PLT(HIDENAME(mcount)); \
  92                         popq %rbp; \
  93                         jmp 9f
  94 #define ENTRY(x)        _ENTRY(x); \
  95                         pushq %rbp; movq %rsp,%rbp; \
  96                         call PIC_PLT(HIDENAME(mcount)); \
  97                         popq %rbp; \
  98                         9:
  99 #else
 100 #define ALTENTRY(x)     _ENTRY(x); \
 101                         pushl %ebp; movl %esp,%ebp; \
 102                         call PIC_PLT(HIDENAME(mcount)); \
 103                         popl %ebp; \
 104                         jmp 9f
 105 #define ENTRY(x)        _ENTRY(x); \
 106                         pushl %ebp; movl %esp,%ebp; \
 107                         call PIC_PLT(HIDENAME(mcount)); \
 108                         popl %ebp; \
 109                         9:
 110 #endif
 111 #else
 112 #define ALTENTRY(x)     _ENTRY(x)
 113 #define ENTRY(x)        _ENTRY(x)
 114 #endif
 115
 116 #define END(x)          .size x, . - x
 117
 118 #define RCSID(x)        .text; .asciz x
 119
 120 #endif /* !_CPU_ASM_H_ */