Commit | Line | Data |
---|---|---|
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/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 | inc_preempt_count(); | |
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 | dec_preempt_count(); | |
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 | ||
e9056f13 IM |
97 | static inline int |
98 | futex_atomic_cmpxchg_inuser(int __user *uaddr, int oldval, int newval) | |
99 | { | |
100 | return -ENOSYS; | |
101 | } | |
102 | ||
4732efbe JJ |
103 | #endif |
104 | #endif |