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: releng/9.2/sys/i386/linux/linux_support.s 169895 2007-05-23 08:33:06Z kib $
30 */
31
32 #include "linux_assym.h" /* system definitions */
33 #include <machine/asmacros.h> /* miscellaneous asm macros */
34
35 #include "assym.s"
36
37 futex_fault_decx:
38 movl PCPU(CURPCB),%ecx
39 futex_fault:
40 movl $0,PCB_ONFAULT(%ecx)
41 movl $-EFAULT,%eax
42 ret
43
44 ENTRY(futex_xchgl)
45 movl PCPU(CURPCB),%ecx
46 movl $futex_fault,PCB_ONFAULT(%ecx)
47 movl 4(%esp),%eax
48 movl 8(%esp),%edx
49 cmpl $VM_MAXUSER_ADDRESS-4,%edx
50 ja futex_fault
51 xchgl %eax,(%edx)
52 movl 12(%esp),%edx
53 movl %eax,(%edx)
54 xorl %eax,%eax
55 movl %eax,PCB_ONFAULT(%ecx)
56 ret
57
58 ENTRY(futex_addl)
59 movl PCPU(CURPCB),%ecx
60 movl $futex_fault,PCB_ONFAULT(%ecx)
61 movl 4(%esp),%eax
62 movl 8(%esp),%edx
63 cmpl $VM_MAXUSER_ADDRESS-4,%edx
64 ja futex_fault
65 #ifdef SMP
66 lock
67 #endif
68 xaddl %eax,(%edx)
69 movl 12(%esp),%edx
70 movl %eax,(%edx)
71 xorl %eax,%eax
72 movl %eax,PCB_ONFAULT(%ecx)
73 ret
74
75 ENTRY(futex_orl)
76 movl PCPU(CURPCB),%ecx
77 movl $futex_fault_decx,PCB_ONFAULT(%ecx)
78 movl 8(%esp),%edx
79 cmpl $VM_MAXUSER_ADDRESS-4,%edx
80 ja futex_fault
81 movl (%edx),%eax
82 1: movl %eax,%ecx
83 orl 4(%esp),%ecx
84 #ifdef SMP
85 lock
86 #endif
87 cmpxchgl %ecx,(%edx)
88 jnz 1b
89 futex_tail:
90 movl 12(%esp),%edx
91 movl %eax,(%edx)
92 xorl %eax,%eax
93 movl PCPU(CURPCB),%ecx
94 movl %eax,PCB_ONFAULT(%ecx)
95 ret
96
97 ENTRY(futex_andl)
98 movl PCPU(CURPCB),%ecx
99 movl $futex_fault_decx,PCB_ONFAULT(%ecx)
100 movl 8(%esp),%edx
101 cmpl $VM_MAXUSER_ADDRESS-4,%edx
102 ja futex_fault
103 movl (%edx),%eax
104 1: movl %eax,%ecx
105 andl 4(%esp),%ecx
106 #ifdef SMP
107 lock
108 #endif
109 cmpxchgl %ecx,(%edx)
110 jnz 1b
111 jmp futex_tail
112
113 ENTRY(futex_xorl)
114 movl PCPU(CURPCB),%ecx
115 movl $futex_fault_decx,PCB_ONFAULT(%ecx)
116 movl 8(%esp),%edx
117 cmpl $VM_MAXUSER_ADDRESS-4,%edx
118 ja futex_fault
119 movl (%edx),%eax
120 1: movl %eax,%ecx
121 xorl 4(%esp),%ecx
122 #ifdef SMP
123 lock
124 #endif
125 cmpxchgl %ecx,(%edx)
126 jnz 1b
127 jmp futex_tail
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