StdLib/Include/X64/machine/asm.h

   1 /*      $NetBSD: asm.h,v 1.6 2006/09/05 19:00:42 ad 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 _AMD64_ASM_H_
  38 #define _AMD64_ASM_H_
  39
  40 #ifdef PIC
  41 #define PIC_PLT(x)      x@PLT
  42 #define PIC_GOT(x)      x@GOTPCREL(%rip)
  43 #else
  44 #define PIC_PLT(x)      x
  45 #define PIC_GOT(x)      x
  46 #endif
  47
  48 # define _C_LABEL(x)    x
  49 #define _ASM_LABEL(x)   x
  50
  51 #define CVAROFF(x,y)            (_C_LABEL(x)+y)(%rip)
  52
  53 #ifdef __STDC__
  54 # define __CONCAT(x,y)  x ## y
  55 # define __STRING(x)    #x
  56 #else
  57 # define __CONCAT(x,y)  x/**/y
  58 # define __STRING(x)    "x"
  59 #endif
  60
  61 /* let kernels and others override entrypoint alignment */
  62 #ifndef _ALIGN_TEXT
  63 #define _ALIGN_TEXT .align 4
  64 #endif
  65
  66 #define _ENTRY(x) \
  67         .text; _ALIGN_TEXT; .globl x; .type x,@function; x:
  68
  69 #ifdef _KERNEL
  70 /* XXX Can't use __CONCAT() here, as it would be evaluated incorrectly. */
  71 #ifdef __STDC__
  72 #define IDTVEC(name) \
  73         ALIGN_TEXT; .globl X ## name; .type X ## name,@function; X ## name:
  74 #else
  75 #define IDTVEC(name) \
  76         ALIGN_TEXT; .globl X/**/name; .type X/**/name,@function; X/**/name:
  77 #endif /* __STDC__ */
  78 #endif /* _KERNEL */
  79
  80 #ifdef __STDC__
  81 #define CPUVAR(off)     %gs:CPU_INFO_ ## off
  82 #else
  83 #define CPUVAR(off)     %gs:CPU_INFO_/**/off
  84 #endif
  85
  86
  87 #ifdef GPROF
  88 # define _PROF_PROLOGUE \
  89         pushq %rbp; leaq (%rsp),%rbp; call PIC_PLT(__mcount); popq %rbp
  90 #else
  91 # define _PROF_PROLOGUE
  92 #endif
  93
  94 #define ENTRY(y)        _ENTRY(_C_LABEL(y)); _PROF_PROLOGUE
  95 #define NENTRY(y)       _ENTRY(_C_LABEL(y))
  96 #define ASENTRY(y)      _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
  97
  98 #define ASMSTR          .asciz
  99
 100 #define RCSID(x)        .text; .asciz x
 101
 102 #define WEAK_ALIAS(alias,sym)                                           \
 103         .weak alias;                                                    \
 104         alias = sym
 105
 106 /*
 107  * STRONG_ALIAS: create a strong alias.
 108  */
 109 #define STRONG_ALIAS(alias,sym)                                         \
 110         .globl alias;                                                   \
 111         alias = sym
 112
 113 /* XXXfvdl do not use stabs here */
 114 #ifdef __STDC__
 115 #define WARN_REFERENCES(sym,msg)                                        \
 116         .stabs msg ## ,30,0,0,0 ;                                       \
 117         .stabs __STRING(_C_LABEL(sym)) ## ,1,0,0,0
 118 #else
 119 #define WARN_REFERENCES(sym,msg)                                        \
 120         .stabs msg,30,0,0,0 ;                                           \
 121         .stabs __STRING(sym),1,0,0,0
 122 #endif /* __STDC__ */
 123
 124 /*
 125  * Assembley equivalent of spllower().  Label contains the label to jump to
 126  * if we need to fire off pending interrupts (e.g. _C_LABEL(Xspllower)).
 127  *
 128  * On entry %rcx = new SPL.
 129  */
 130 #define SPLLOWER(label)                                         \
 131         movq            CPUVAR(SELF), %r9 ;                     \
 132         cmpl            CPU_INFO_ILEVEL(%r9), %ecx ;            \
 133         jae             99f ;                                   \
 134         movl            CPU_INFO_IUNMASK(%r9,%rcx,4), %edi ;    \
 135         pushfq          ;                                       \
 136         popq            %rax ;                                  \
 137         cli             ;                                       \
 138         testl           CPU_INFO_IPENDING(%r9), %edi ;          \
 139         movq            %rcx, %rdi ;                            \
 140         jnz             label ;                                 \
 141         movl            %ecx, CPU_INFO_ILEVEL(%r9) ;            \
 142         pushq           %rax ;                                  \
 143         popfq           ;                                       \
 144 99:
 145
 146 #endif /* !_AMD64_ASM_H_ */