x86: sanitize pathes arch/x86/kernel/cpu/Makefile
[linux-3.10.git] / include / asm-x86_64 / futex.h
1 #ifndef _ASM_FUTEX_H
2 #define _ASM_FUTEX_H
3
4 #ifdef __KERNEL__
5
6 #include <linux/futex.h>
7 #include <asm/errno.h>
8 #include <asm/system.h>
9 #include <asm/uaccess.h>
10
11 #define __futex_atomic_op1(insn, ret, oldval, uaddr, oparg) \
12   __asm__ __volatile (                                          \
13 "1:     " insn "\n"                                             \
14 "2:     .section .fixup,\"ax\"\n\
15 3:      mov     %3, %1\n\
16         jmp     2b\n\
17         .previous\n\
18         .section __ex_table,\"a\"\n\
19         .align  8\n\
20         .quad   1b,3b\n\
21         .previous"                                              \
22         : "=r" (oldval), "=r" (ret), "=m" (*uaddr)              \
23         : "i" (-EFAULT), "m" (*uaddr), "0" (oparg), "1" (0))
24
25 #define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg) \
26   __asm__ __volatile (                                          \
27 "1:     movl    %2, %0\n\
28         movl    %0, %3\n"                                       \
29         insn "\n"                                               \
30 "2:     " LOCK_PREFIX "cmpxchgl %3, %2\n\
31         jnz     1b\n\
32 3:      .section .fixup,\"ax\"\n\
33 4:      mov     %5, %1\n\
34         jmp     3b\n\
35         .previous\n\
36         .section __ex_table,\"a\"\n\
37         .align  8\n\
38         .quad   1b,4b,2b,4b\n\
39         .previous"                                              \
40         : "=&a" (oldval), "=&r" (ret), "=m" (*uaddr),           \
41           "=&r" (tem)                                           \
42         : "r" (oparg), "i" (-EFAULT), "m" (*uaddr), "1" (0))
43
44 static inline int
45 futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
46 {
47         int op = (encoded_op >> 28) & 7;
48         int cmp = (encoded_op >> 24) & 15;
49         int oparg = (encoded_op << 8) >> 20;
50         int cmparg = (encoded_op << 20) >> 20;
51         int oldval = 0, ret, tem;
52         if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
53                 oparg = 1 << oparg;
54
55         if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
56                 return -EFAULT;
57
58         pagefault_disable();
59
60         switch (op) {
61         case FUTEX_OP_SET:
62                 __futex_atomic_op1("xchgl %0, %2", ret, oldval, uaddr, oparg);
63                 break;
64         case FUTEX_OP_ADD:
65                 __futex_atomic_op1(LOCK_PREFIX "xaddl %0, %2", ret, oldval,
66                                    uaddr, oparg);
67                 break;
68         case FUTEX_OP_OR:
69                 __futex_atomic_op2("orl %4, %3", ret, oldval, uaddr, oparg);
70                 break;
71         case FUTEX_OP_ANDN:
72                 __futex_atomic_op2("andl %4, %3", ret, oldval, uaddr, ~oparg);
73                 break;
74         case FUTEX_OP_XOR:
75                 __futex_atomic_op2("xorl %4, %3", ret, oldval, uaddr, oparg);
76                 break;
77         default:
78                 ret = -ENOSYS;
79         }
80
81         pagefault_enable();
82
83         if (!ret) {
84                 switch (cmp) {
85                 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
86                 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
87                 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
88                 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
89                 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
90                 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
91                 default: ret = -ENOSYS;
92                 }
93         }
94         return ret;
95 }
96
97 static inline int
98 futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
99 {
100         if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
101                 return -EFAULT;
102
103         __asm__ __volatile__(
104                 "1:     " LOCK_PREFIX "cmpxchgl %3, %1          \n"
105
106                 "2:     .section .fixup, \"ax\"                 \n"
107                 "3:     mov     %2, %0                          \n"
108                 "       jmp     2b                              \n"
109                 "       .previous                               \n"
110
111                 "       .section __ex_table, \"a\"              \n"
112                 "       .align  8                               \n"
113                 "       .quad   1b,3b                           \n"
114                 "       .previous                               \n"
115
116                 : "=a" (oldval), "=m" (*uaddr)
117                 : "i" (-EFAULT), "r" (newval), "0" (oldval)
118                 : "memory"
119         );
120
121         return oldval;
122 }
123
124 #endif
125 #endif