The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/amd64/linux32/linux32_support.s

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    1 /*-
    2  * Copyright (c) 2007 Konstantin Belousov
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * $FreeBSD: releng/11.2/sys/amd64/linux32/linux32_support.s 169895 2007-05-23 08:33:06Z kib $
   30  */
   31 
   32 #include "linux32_assym.h"              /* system definitions */
   33 #include <machine/asmacros.h>           /* miscellaneous asm macros */
   34 
   35 #include "assym.s"
   36 
   37 futex_fault:
   38         movq    $0,PCB_ONFAULT(%r8)
   39         movl    $-EFAULT,%eax
   40         ret
   41 
   42 ENTRY(futex_xchgl)
   43         movq    PCPU(CURPCB),%r8
   44         movq    $futex_fault,PCB_ONFAULT(%r8)
   45         movq    $VM_MAXUSER_ADDRESS-4,%rax
   46         cmpq    %rax,%rsi
   47         ja      futex_fault
   48         xchgl   %edi,(%rsi)
   49         movl    %edi,(%rdx)
   50         xorl    %eax,%eax
   51         movq    %rax,PCB_ONFAULT(%r8)
   52         ret
   53 
   54 ENTRY(futex_addl)
   55         movq    PCPU(CURPCB),%r8
   56         movq    $futex_fault,PCB_ONFAULT(%r8)
   57         movq    $VM_MAXUSER_ADDRESS-4,%rax
   58         cmpq    %rax,%rsi
   59         ja      futex_fault
   60 #ifdef SMP
   61         lock
   62 #endif
   63         xaddl   %edi,(%rsi)
   64         movl    %edi,(%rdx)
   65         xorl    %eax,%eax
   66         movq    %rax,PCB_ONFAULT(%r8)
   67         ret
   68 
   69 ENTRY(futex_orl)
   70         movq    PCPU(CURPCB),%r8
   71         movq    $futex_fault,PCB_ONFAULT(%r8)
   72         movq    $VM_MAXUSER_ADDRESS-4,%rax
   73         cmpq    %rax,%rsi
   74         ja      futex_fault
   75         movl    (%rsi),%eax
   76 1:      movl    %eax,%ecx
   77         orl     %edi,%ecx
   78 #ifdef SMP
   79         lock
   80 #endif
   81         cmpxchgl %ecx,(%rsi)
   82         jnz     1b
   83         movl    %eax,(%rdx)
   84         xorl    %eax,%eax
   85         movq    %rax,PCB_ONFAULT(%r8)
   86         ret
   87 
   88 ENTRY(futex_andl)
   89         movq    PCPU(CURPCB),%r8
   90         movq    $futex_fault,PCB_ONFAULT(%r8)
   91         movq    $VM_MAXUSER_ADDRESS-4,%rax
   92         cmpq    %rax,%rsi
   93         ja      futex_fault
   94         movl    (%rsi),%eax
   95 1:      movl    %eax,%ecx
   96         andl    %edi,%ecx
   97 #ifdef SMP
   98         lock
   99 #endif
  100         cmpxchgl %ecx,(%rsi)
  101         jnz     1b
  102         movl    %eax,(%rdx)
  103         xorl    %eax,%eax
  104         movq    %rax,PCB_ONFAULT(%r8)
  105         ret
  106 
  107 ENTRY(futex_xorl)
  108         movq    PCPU(CURPCB),%r8
  109         movq    $futex_fault,PCB_ONFAULT(%r8)
  110         movq    $VM_MAXUSER_ADDRESS-4,%rax
  111         cmpq    %rax,%rsi
  112         ja      futex_fault
  113         movl    (%rsi),%eax
  114 1:      movl    %eax,%ecx
  115         xorl    %edi,%ecx
  116 #ifdef SMP
  117         lock
  118 #endif
  119         cmpxchgl %ecx,(%rsi)
  120         jnz     1b
  121         movl    %eax,(%rdx)
  122         xorl    %eax,%eax
  123         movq    %rax,PCB_ONFAULT(%r8)
  124         ret

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