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: stable/11/sys/amd64/linux32/linux32_support.s 337650 2018-08-11 17:52:58Z 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 END(futex_xchgl)
   54 
   55 ENTRY(futex_addl)
   56         movq    PCPU(CURPCB),%r8
   57         movq    $futex_fault,PCB_ONFAULT(%r8)
   58         movq    $VM_MAXUSER_ADDRESS-4,%rax
   59         cmpq    %rax,%rsi
   60         ja      futex_fault
   61 #ifdef SMP
   62         lock
   63 #endif
   64         xaddl   %edi,(%rsi)
   65         movl    %edi,(%rdx)
   66         xorl    %eax,%eax
   67         movq    %rax,PCB_ONFAULT(%r8)
   68         ret
   69 END(futex_addl)
   70 
   71 ENTRY(futex_orl)
   72         movq    PCPU(CURPCB),%r8
   73         movq    $futex_fault,PCB_ONFAULT(%r8)
   74         movq    $VM_MAXUSER_ADDRESS-4,%rax
   75         cmpq    %rax,%rsi
   76         ja      futex_fault
   77         movl    (%rsi),%eax
   78 1:      movl    %eax,%ecx
   79         orl     %edi,%ecx
   80 #ifdef SMP
   81         lock
   82 #endif
   83         cmpxchgl %ecx,(%rsi)
   84         jnz     1b
   85         movl    %eax,(%rdx)
   86         xorl    %eax,%eax
   87         movq    %rax,PCB_ONFAULT(%r8)
   88         ret
   89 END(futex_orl)
   90 
   91 ENTRY(futex_andl)
   92         movq    PCPU(CURPCB),%r8
   93         movq    $futex_fault,PCB_ONFAULT(%r8)
   94         movq    $VM_MAXUSER_ADDRESS-4,%rax
   95         cmpq    %rax,%rsi
   96         ja      futex_fault
   97         movl    (%rsi),%eax
   98 1:      movl    %eax,%ecx
   99         andl    %edi,%ecx
  100 #ifdef SMP
  101         lock
  102 #endif
  103         cmpxchgl %ecx,(%rsi)
  104         jnz     1b
  105         movl    %eax,(%rdx)
  106         xorl    %eax,%eax
  107         movq    %rax,PCB_ONFAULT(%r8)
  108         ret
  109 END(futex_andl)
  110 
  111 ENTRY(futex_xorl)
  112         movq    PCPU(CURPCB),%r8
  113         movq    $futex_fault,PCB_ONFAULT(%r8)
  114         movq    $VM_MAXUSER_ADDRESS-4,%rax
  115         cmpq    %rax,%rsi
  116         ja      futex_fault
  117         movl    (%rsi),%eax
  118 1:      movl    %eax,%ecx
  119         xorl    %edi,%ecx
  120 #ifdef SMP
  121         lock
  122 #endif
  123         cmpxchgl %ecx,(%rsi)
  124         jnz     1b
  125         movl    %eax,(%rdx)
  126         xorl    %eax,%eax
  127         movq    %rax,PCB_ONFAULT(%r8)
  128         ret
  129 END(futex_xorl)

Cache object: 02b69cddc02d6298d84c2df9db2e4f2d


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