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4732efbe JJ |
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/processor.h> | |
10 | #include <asm/uaccess.h> | |
11 | ||
12 | #define __futex_atomic_op1(insn, ret, oldval, uaddr, oparg) \ | |
13 | __asm__ __volatile ( \ | |
14 | "1: " insn "\n" \ | |
15 | "2: .section .fixup,\"ax\"\n\ | |
16 | 3: mov %3, %1\n\ | |
17 | jmp 2b\n\ | |
18 | .previous\n\ | |
19 | .section __ex_table,\"a\"\n\ | |
20 | .align 8\n\ | |
21 | .long 1b,3b\n\ | |
22 | .previous" \ | |
23 | : "=r" (oldval), "=r" (ret), "=m" (*uaddr) \ | |
24 | : "i" (-EFAULT), "m" (*uaddr), "0" (oparg), "1" (0)) | |
25 | ||
26 | #define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg) \ | |
27 | __asm__ __volatile ( \ | |
28 | "1: movl %2, %0\n\ | |
29 | movl %0, %3\n" \ | |
30 | insn "\n" \ | |
31 | "2: " LOCK_PREFIX "cmpxchgl %3, %2\n\ | |
32 | jnz 1b\n\ | |
33 | 3: .section .fixup,\"ax\"\n\ | |
34 | 4: mov %5, %1\n\ | |
35 | jmp 3b\n\ | |
36 | .previous\n\ | |
37 | .section __ex_table,\"a\"\n\ | |
38 | .align 8\n\ | |
39 | .long 1b,4b,2b,4b\n\ | |
40 | .previous" \ | |
41 | : "=&a" (oldval), "=&r" (ret), "=m" (*uaddr), \ | |
42 | "=&r" (tem) \ | |
43 | : "r" (oparg), "i" (-EFAULT), "m" (*uaddr), "1" (0)) | |
44 | ||
45 | static inline int | |
46 | futex_atomic_op_inuser (int encoded_op, int __user *uaddr) | |
47 | { | |
48 | int op = (encoded_op >> 28) & 7; | |
49 | int cmp = (encoded_op >> 24) & 15; | |
50 | int oparg = (encoded_op << 8) >> 20; | |
51 | int cmparg = (encoded_op << 20) >> 20; | |
52 | int oldval = 0, ret, tem; | |
53 | if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) | |
54 | oparg = 1 << oparg; | |
55 | ||
56 | if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int))) | |
57 | return -EFAULT; | |
58 | ||
59 | inc_preempt_count(); | |
60 | ||
61 | if (op == FUTEX_OP_SET) | |
62 | __futex_atomic_op1("xchgl %0, %2", ret, oldval, uaddr, oparg); | |
63 | else { | |
3b948068 | 64 | #ifndef CONFIG_X86_BSWAP |
4732efbe JJ |
65 | if (boot_cpu_data.x86 == 3) |
66 | ret = -ENOSYS; | |
67 | else | |
68 | #endif | |
69 | switch (op) { | |
70 | case FUTEX_OP_ADD: | |
71 | __futex_atomic_op1(LOCK_PREFIX "xaddl %0, %2", ret, | |
72 | oldval, uaddr, oparg); | |
73 | break; | |
74 | case FUTEX_OP_OR: | |
75 | __futex_atomic_op2("orl %4, %3", ret, oldval, uaddr, | |
76 | oparg); | |
77 | break; | |
78 | case FUTEX_OP_ANDN: | |
79 | __futex_atomic_op2("andl %4, %3", ret, oldval, uaddr, | |
80 | ~oparg); | |
81 | break; | |
82 | case FUTEX_OP_XOR: | |
83 | __futex_atomic_op2("xorl %4, %3", ret, oldval, uaddr, | |
84 | oparg); | |
85 | break; | |
86 | default: | |
87 | ret = -ENOSYS; | |
88 | } | |
89 | } | |
90 | ||
91 | dec_preempt_count(); | |
92 | ||
93 | if (!ret) { | |
94 | switch (cmp) { | |
95 | case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; | |
96 | case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; | |
97 | case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; | |
98 | case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; | |
99 | case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; | |
100 | case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; | |
101 | default: ret = -ENOSYS; | |
102 | } | |
103 | } | |
104 | return ret; | |
105 | } | |
106 | ||
107 | #endif | |
108 | #endif |