sys/amd64/linux32/linux32_support.s

   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  * $FreeBSD$
  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