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1965aae3 PA |
1 | #ifndef _ASM_X86_FUTEX_H |
2 | #define _ASM_X86_FUTEX_H | |
2f18e47c TG |
3 | |
4 | #ifdef __KERNEL__ | |
5 | ||
6 | #include <linux/futex.h> | |
730f412c | 7 | #include <linux/uaccess.h> |
2f18e47c TG |
8 | |
9 | #include <asm/asm.h> | |
10 | #include <asm/errno.h> | |
11 | #include <asm/processor.h> | |
63bcff2a | 12 | #include <asm/smap.h> |
2f18e47c TG |
13 | |
14 | #define __futex_atomic_op1(insn, ret, oldval, uaddr, oparg) \ | |
63bcff2a PA |
15 | asm volatile("\t" ASM_STAC "\n" \ |
16 | "1:\t" insn "\n" \ | |
17 | "2:\t" ASM_CLAC "\n" \ | |
18 | "\t.section .fixup,\"ax\"\n" \ | |
9407913f JP |
19 | "3:\tmov\t%3, %1\n" \ |
20 | "\tjmp\t2b\n" \ | |
21 | "\t.previous\n" \ | |
22 | _ASM_EXTABLE(1b, 3b) \ | |
23 | : "=r" (oldval), "=r" (ret), "+m" (*uaddr) \ | |
24 | : "i" (-EFAULT), "0" (oparg), "1" (0)) | |
2f18e47c TG |
25 | |
26 | #define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg) \ | |
63bcff2a PA |
27 | asm volatile("\t" ASM_STAC "\n" \ |
28 | "1:\tmovl %2, %0\n" \ | |
9407913f JP |
29 | "\tmovl\t%0, %3\n" \ |
30 | "\t" insn "\n" \ | |
1f49a2c2 | 31 | "2:\t" LOCK_PREFIX "cmpxchgl %3, %2\n" \ |
9407913f | 32 | "\tjnz\t1b\n" \ |
63bcff2a PA |
33 | "3:\t" ASM_CLAC "\n" \ |
34 | "\t.section .fixup,\"ax\"\n" \ | |
9407913f JP |
35 | "4:\tmov\t%5, %1\n" \ |
36 | "\tjmp\t3b\n" \ | |
37 | "\t.previous\n" \ | |
38 | _ASM_EXTABLE(1b, 4b) \ | |
39 | _ASM_EXTABLE(2b, 4b) \ | |
40 | : "=&a" (oldval), "=&r" (ret), \ | |
41 | "+m" (*uaddr), "=&r" (tem) \ | |
42 | : "r" (oparg), "i" (-EFAULT), "1" (0)) | |
43 | ||
8d7718aa | 44 | static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr) |
2f18e47c TG |
45 | { |
46 | int op = (encoded_op >> 28) & 7; | |
47 | int cmp = (encoded_op >> 24) & 15; | |
48 | int oparg = (encoded_op << 8) >> 20; | |
49 | int cmparg = (encoded_op << 20) >> 20; | |
50 | int oldval = 0, ret, tem; | |
51 | ||
52 | if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) | |
53 | oparg = 1 << oparg; | |
54 | ||
8d7718aa | 55 | if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))) |
2f18e47c TG |
56 | return -EFAULT; |
57 | ||
2f18e47c TG |
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: | |
1f49a2c2 | 65 | __futex_atomic_op1(LOCK_PREFIX "xaddl %0, %2", ret, oldval, |
2f18e47c TG |
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) { | |
9407913f JP |
85 | case FUTEX_OP_CMP_EQ: |
86 | ret = (oldval == cmparg); | |
87 | break; | |
88 | case FUTEX_OP_CMP_NE: | |
89 | ret = (oldval != cmparg); | |
90 | break; | |
91 | case FUTEX_OP_CMP_LT: | |
92 | ret = (oldval < cmparg); | |
93 | break; | |
94 | case FUTEX_OP_CMP_GE: | |
95 | ret = (oldval >= cmparg); | |
96 | break; | |
97 | case FUTEX_OP_CMP_LE: | |
98 | ret = (oldval <= cmparg); | |
99 | break; | |
100 | case FUTEX_OP_CMP_GT: | |
101 | ret = (oldval > cmparg); | |
102 | break; | |
103 | default: | |
104 | ret = -ENOSYS; | |
2f18e47c TG |
105 | } |
106 | } | |
107 | return ret; | |
108 | } | |
109 | ||
8d7718aa ML |
110 | static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, |
111 | u32 oldval, u32 newval) | |
2f18e47c | 112 | { |
0ee3b6f8 | 113 | return user_atomic_cmpxchg_inatomic(uval, uaddr, oldval, newval); |
2f18e47c TG |
114 | } |
115 | ||
116 | #endif | |
1965aae3 | 117 | #endif /* _ASM_X86_FUTEX_H */ |