diff options
Diffstat (limited to 'include/asm-x86/futex.h')
-rw-r--r-- | include/asm-x86/futex.h | 140 |
1 files changed, 0 insertions, 140 deletions
diff --git a/include/asm-x86/futex.h b/include/asm-x86/futex.h deleted file mode 100644 index 06b924ef6fa5..000000000000 --- a/include/asm-x86/futex.h +++ /dev/null | |||
@@ -1,140 +0,0 @@ | |||
1 | #ifndef ASM_X86__FUTEX_H | ||
2 | #define ASM_X86__FUTEX_H | ||
3 | |||
4 | #ifdef __KERNEL__ | ||
5 | |||
6 | #include <linux/futex.h> | ||
7 | #include <linux/uaccess.h> | ||
8 | |||
9 | #include <asm/asm.h> | ||
10 | #include <asm/errno.h> | ||
11 | #include <asm/processor.h> | ||
12 | #include <asm/system.h> | ||
13 | |||
14 | #define __futex_atomic_op1(insn, ret, oldval, uaddr, oparg) \ | ||
15 | asm volatile("1:\t" insn "\n" \ | ||
16 | "2:\t.section .fixup,\"ax\"\n" \ | ||
17 | "3:\tmov\t%3, %1\n" \ | ||
18 | "\tjmp\t2b\n" \ | ||
19 | "\t.previous\n" \ | ||
20 | _ASM_EXTABLE(1b, 3b) \ | ||
21 | : "=r" (oldval), "=r" (ret), "+m" (*uaddr) \ | ||
22 | : "i" (-EFAULT), "0" (oparg), "1" (0)) | ||
23 | |||
24 | #define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg) \ | ||
25 | asm volatile("1:\tmovl %2, %0\n" \ | ||
26 | "\tmovl\t%0, %3\n" \ | ||
27 | "\t" insn "\n" \ | ||
28 | "2:\t" LOCK_PREFIX "cmpxchgl %3, %2\n" \ | ||
29 | "\tjnz\t1b\n" \ | ||
30 | "3:\t.section .fixup,\"ax\"\n" \ | ||
31 | "4:\tmov\t%5, %1\n" \ | ||
32 | "\tjmp\t3b\n" \ | ||
33 | "\t.previous\n" \ | ||
34 | _ASM_EXTABLE(1b, 4b) \ | ||
35 | _ASM_EXTABLE(2b, 4b) \ | ||
36 | : "=&a" (oldval), "=&r" (ret), \ | ||
37 | "+m" (*uaddr), "=&r" (tem) \ | ||
38 | : "r" (oparg), "i" (-EFAULT), "1" (0)) | ||
39 | |||
40 | static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr) | ||
41 | { | ||
42 | int op = (encoded_op >> 28) & 7; | ||
43 | int cmp = (encoded_op >> 24) & 15; | ||
44 | int oparg = (encoded_op << 8) >> 20; | ||
45 | int cmparg = (encoded_op << 20) >> 20; | ||
46 | int oldval = 0, ret, tem; | ||
47 | |||
48 | if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) | ||
49 | oparg = 1 << oparg; | ||
50 | |||
51 | if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) | ||
52 | return -EFAULT; | ||
53 | |||
54 | #if defined(CONFIG_X86_32) && !defined(CONFIG_X86_BSWAP) | ||
55 | /* Real i386 machines can only support FUTEX_OP_SET */ | ||
56 | if (op != FUTEX_OP_SET && boot_cpu_data.x86 == 3) | ||
57 | return -ENOSYS; | ||
58 | #endif | ||
59 | |||
60 | pagefault_disable(); | ||
61 | |||
62 | switch (op) { | ||
63 | case FUTEX_OP_SET: | ||
64 | __futex_atomic_op1("xchgl %0, %2", ret, oldval, uaddr, oparg); | ||
65 | break; | ||
66 | case FUTEX_OP_ADD: | ||
67 | __futex_atomic_op1(LOCK_PREFIX "xaddl %0, %2", ret, oldval, | ||
68 | uaddr, oparg); | ||
69 | break; | ||
70 | case FUTEX_OP_OR: | ||
71 | __futex_atomic_op2("orl %4, %3", ret, oldval, uaddr, oparg); | ||
72 | break; | ||
73 | case FUTEX_OP_ANDN: | ||
74 | __futex_atomic_op2("andl %4, %3", ret, oldval, uaddr, ~oparg); | ||
75 | break; | ||
76 | case FUTEX_OP_XOR: | ||
77 | __futex_atomic_op2("xorl %4, %3", ret, oldval, uaddr, oparg); | ||
78 | break; | ||
79 | default: | ||
80 | ret = -ENOSYS; | ||
81 | } | ||
82 | |||
83 | pagefault_enable(); | ||
84 | |||
85 | if (!ret) { | ||
86 | switch (cmp) { | ||
87 | case FUTEX_OP_CMP_EQ: | ||
88 | ret = (oldval == cmparg); | ||
89 | break; | ||
90 | case FUTEX_OP_CMP_NE: | ||
91 | ret = (oldval != cmparg); | ||
92 | break; | ||
93 | case FUTEX_OP_CMP_LT: | ||
94 | ret = (oldval < cmparg); | ||
95 | break; | ||
96 | case FUTEX_OP_CMP_GE: | ||
97 | ret = (oldval >= cmparg); | ||
98 | break; | ||
99 | case FUTEX_OP_CMP_LE: | ||
100 | ret = (oldval <= cmparg); | ||
101 | break; | ||
102 | case FUTEX_OP_CMP_GT: | ||
103 | ret = (oldval > cmparg); | ||
104 | break; | ||
105 | default: | ||
106 | ret = -ENOSYS; | ||
107 | } | ||
108 | } | ||
109 | return ret; | ||
110 | } | ||
111 | |||
112 | static inline int futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, | ||
113 | int newval) | ||
114 | { | ||
115 | |||
116 | #if defined(CONFIG_X86_32) && !defined(CONFIG_X86_BSWAP) | ||
117 | /* Real i386 machines have no cmpxchg instruction */ | ||
118 | if (boot_cpu_data.x86 == 3) | ||
119 | return -ENOSYS; | ||
120 | #endif | ||
121 | |||
122 | if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) | ||
123 | return -EFAULT; | ||
124 | |||
125 | asm volatile("1:\t" LOCK_PREFIX "cmpxchgl %3, %1\n" | ||
126 | "2:\t.section .fixup, \"ax\"\n" | ||
127 | "3:\tmov %2, %0\n" | ||
128 | "\tjmp 2b\n" | ||
129 | "\t.previous\n" | ||
130 | _ASM_EXTABLE(1b, 3b) | ||
131 | : "=a" (oldval), "+m" (*uaddr) | ||
132 | : "i" (-EFAULT), "r" (newval), "0" (oldval) | ||
133 | : "memory" | ||
134 | ); | ||
135 | |||
136 | return oldval; | ||
137 | } | ||
138 | |||
139 | #endif | ||
140 | #endif /* ASM_X86__FUTEX_H */ | ||