sys/emulation/linux/i386/linux_support.s

   1 /*-
   2  * Copyright (c) 2006,2007 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 "linux_assym.h"                /* system definitions */
  33 #include <machine/asmacros.h>           /* miscellaneous asm macros */
  34 #include <machine/cputypes.h>
  35 #include <machine/pmap.h>
  36 #include <machine/specialreg.h>
  37
  38 #include "assym.s"
  39
  40 /*
  41  * A stack-based on-fault routine is used for more complex PCB_ONFAULT
  42  * situations (such as memcpy/bcopy/bzero).  In this case the on-fault
  43  * routine must be pushed on the stack.
  44  */
  45 stack_onfault:
  46         ret
  47
  48 futex_fault_decx:
  49         movl    PCPU(curthread),%ecx
  50         movl    TD_PCB(%ecx), %ecx
  51 futex_fault:
  52         movl    $0,PCB_ONFAULT(%ecx)
  53         movl    $EFAULT,%eax
  54         ret
  55
  56 futex_fault_pop:
  57         addl    $4,%esp
  58         movl    $0,PCB_ONFAULT(%ecx)
  59         movl    $EFAULT,%eax
  60         ret
  61
  62 ENTRY(futex_xchgl)
  63         movl    PCPU(curthread),%ecx
  64         movl    TD_PCB(%ecx),%ecx
  65         pushl   $futex_fault
  66         movl    $stack_onfault, PCB_ONFAULT(%ecx)
  67         movl    8(%esp),%eax
  68         movl    12(%esp),%edx
  69         cmpl    $VM_MAX_USER_ADDRESS-4,%edx
  70         ja      futex_fault_pop
  71         xchgl   %eax,(%edx)
  72         movl    16(%esp),%edx
  73         movl    %eax,(%edx)
  74         xorl    %eax,%eax
  75         movl    %eax,PCB_ONFAULT(%ecx)
  76         ret
  77
  78 ENTRY(futex_addl)
  79         movl    PCPU(curthread),%ecx
  80         movl    TD_PCB(%ecx),%ecx
  81         pushl   $futex_fault
  82         movl    $stack_onfault,PCB_ONFAULT(%ecx)
  83         movl    8(%esp),%eax
  84         movl    12(%esp),%edx
  85         cmpl    $VM_MAX_USER_ADDRESS-4,%edx
  86         ja      futex_fault_pop
  87 #ifdef SMP
  88         lock
  89 #endif
  90         xaddl   %eax,(%edx)
  91         movl    16(%esp),%edx
  92         movl    %eax,(%edx)
  93         xorl    %eax,%eax
  94         movl    %eax,PCB_ONFAULT(%ecx)
  95         ret
  96
  97 ENTRY(futex_orl)
  98         movl    PCPU(curthread),%ecx
  99         movl    TD_PCB(%ecx),%ecx
 100         pushl   $futex_fault_decx
 101         movl    $stack_onfault,PCB_ONFAULT(%ecx)
 102         movl    12(%esp),%edx
 103         cmpl    $VM_MAX_USER_ADDRESS-4,%edx
 104         ja      futex_fault_pop
 105         movl    (%edx),%eax
 106 1:      movl    %eax,%ecx
 107         orl     8(%esp),%ecx
 108 #ifdef SMP
 109         lock
 110 #endif
 111         cmpxchgl %ecx,(%edx)
 112         jnz     1b
 113 futex_tail:
 114         movl    16(%esp),%edx
 115         movl    %eax,(%edx)
 116         xorl    %eax,%eax
 117         movl    PCPU(curthread),%ecx
 118         movl    %eax,PCB_ONFAULT(%ecx)
 119         ret
 120
 121 ENTRY(futex_andl)
 122         movl    PCPU(curthread),%ecx
 123         movl    TD_PCB(%ecx),%ecx
 124         pushl   $futex_fault_decx
 125         movl    $stack_onfault,PCB_ONFAULT(%ecx)
 126         movl    12(%esp),%edx
 127         cmpl    $VM_MAX_USER_ADDRESS-4,%edx
 128         ja      futex_fault_pop
 129         movl    (%edx),%eax
 130 1:      movl    %eax,%ecx
 131         andl    8(%esp),%ecx
 132 #ifdef SMP
 133         lock
 134 #endif
 135         cmpxchgl %ecx,(%edx)
 136         jnz     1b
 137         jmp     futex_tail
 138
 139 ENTRY(futex_xorl)
 140         movl    PCPU(curthread),%ecx
 141         movl    TD_PCB(%ecx),%ecx
 142         pushl   $futex_fault_decx
 143         movl    $stack_onfault,PCB_ONFAULT(%ecx)
 144         movl    12(%esp),%edx
 145         cmpl    $VM_MAX_USER_ADDRESS-4,%edx
 146         ja      futex_fault_pop
 147         movl    (%edx),%eax
 148 1:      movl    %eax,%ecx
 149         xorl    8(%esp),%ecx
 150 #ifdef SMP
 151         lock
 152 #endif
 153         cmpxchgl %ecx,(%edx)
 154         jnz     1b
 155         jmp     futex_tail