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2ff2ae7a DG |
1 | #ifndef _ASM_POWERPC_FUTEX_H |
2 | #define _ASM_POWERPC_FUTEX_H | |
4732efbe JJ |
3 | |
4 | #ifdef __KERNEL__ | |
5 | ||
6 | #include <linux/futex.h> | |
730f412c | 7 | #include <linux/uaccess.h> |
4732efbe | 8 | #include <asm/errno.h> |
feaf7cf1 | 9 | #include <asm/synch.h> |
3ddfbcf1 | 10 | #include <asm/asm-compat.h> |
4732efbe JJ |
11 | |
12 | #define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \ | |
2ff2ae7a | 13 | __asm__ __volatile ( \ |
b97021f8 | 14 | PPC_ATOMIC_ENTRY_BARRIER \ |
2ff2ae7a DG |
15 | "1: lwarx %0,0,%2\n" \ |
16 | insn \ | |
3ddfbcf1 | 17 | PPC405_ERR77(0, %2) \ |
2ff2ae7a DG |
18 | "2: stwcx. %1,0,%2\n" \ |
19 | "bne- 1b\n" \ | |
b97021f8 | 20 | PPC_ATOMIC_EXIT_BARRIER \ |
2ff2ae7a DG |
21 | "li %1,0\n" \ |
22 | "3: .section .fixup,\"ax\"\n" \ | |
23 | "4: li %1,%3\n" \ | |
24 | "b 3b\n" \ | |
25 | ".previous\n" \ | |
26 | ".section __ex_table,\"a\"\n" \ | |
27 | ".align 3\n" \ | |
3ddfbcf1 | 28 | PPC_LONG "1b,4b,2b,4b\n" \ |
2ff2ae7a DG |
29 | ".previous" \ |
30 | : "=&r" (oldval), "=&r" (ret) \ | |
306a8288 | 31 | : "b" (uaddr), "i" (-EFAULT), "r" (oparg) \ |
4732efbe JJ |
32 | : "cr0", "memory") |
33 | ||
8d7718aa | 34 | static inline int futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr) |
4732efbe JJ |
35 | { |
36 | int op = (encoded_op >> 28) & 7; | |
37 | int cmp = (encoded_op >> 24) & 15; | |
38 | int oparg = (encoded_op << 8) >> 20; | |
39 | int cmparg = (encoded_op << 20) >> 20; | |
40 | int oldval = 0, ret; | |
41 | if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) | |
42 | oparg = 1 << oparg; | |
43 | ||
8d7718aa | 44 | if (! access_ok (VERIFY_WRITE, uaddr, sizeof(u32))) |
4732efbe JJ |
45 | return -EFAULT; |
46 | ||
a866374a | 47 | pagefault_disable(); |
4732efbe JJ |
48 | |
49 | switch (op) { | |
50 | case FUTEX_OP_SET: | |
306a8288 | 51 | __futex_atomic_op("mr %1,%4\n", ret, oldval, uaddr, oparg); |
4732efbe JJ |
52 | break; |
53 | case FUTEX_OP_ADD: | |
306a8288 | 54 | __futex_atomic_op("add %1,%0,%4\n", ret, oldval, uaddr, oparg); |
4732efbe JJ |
55 | break; |
56 | case FUTEX_OP_OR: | |
306a8288 | 57 | __futex_atomic_op("or %1,%0,%4\n", ret, oldval, uaddr, oparg); |
4732efbe JJ |
58 | break; |
59 | case FUTEX_OP_ANDN: | |
306a8288 | 60 | __futex_atomic_op("andc %1,%0,%4\n", ret, oldval, uaddr, oparg); |
4732efbe JJ |
61 | break; |
62 | case FUTEX_OP_XOR: | |
306a8288 | 63 | __futex_atomic_op("xor %1,%0,%4\n", ret, oldval, uaddr, oparg); |
4732efbe JJ |
64 | break; |
65 | default: | |
66 | ret = -ENOSYS; | |
67 | } | |
68 | ||
a866374a | 69 | pagefault_enable(); |
4732efbe JJ |
70 | |
71 | if (!ret) { | |
72 | switch (cmp) { | |
73 | case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; | |
74 | case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; | |
75 | case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; | |
76 | case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; | |
77 | case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; | |
78 | case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; | |
79 | default: ret = -ENOSYS; | |
80 | } | |
81 | } | |
82 | return ret; | |
83 | } | |
84 | ||
e9056f13 | 85 | static inline int |
8d7718aa ML |
86 | futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, |
87 | u32 oldval, u32 newval) | |
e9056f13 | 88 | { |
8d7718aa ML |
89 | int ret = 0; |
90 | u32 prev; | |
69588298 | 91 | |
8d7718aa | 92 | if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))) |
69588298 DW |
93 | return -EFAULT; |
94 | ||
95 | __asm__ __volatile__ ( | |
b97021f8 | 96 | PPC_ATOMIC_ENTRY_BARRIER |
37a9d912 ML |
97 | "1: lwarx %1,0,%3 # futex_atomic_cmpxchg_inatomic\n\ |
98 | cmpw 0,%1,%4\n\ | |
69588298 | 99 | bne- 3f\n" |
37a9d912 ML |
100 | PPC405_ERR77(0,%3) |
101 | "2: stwcx. %5,0,%3\n\ | |
69588298 | 102 | bne- 1b\n" |
b97021f8 | 103 | PPC_ATOMIC_EXIT_BARRIER |
69588298 | 104 | "3: .section .fixup,\"ax\"\n\ |
37a9d912 | 105 | 4: li %0,%6\n\ |
69588298 DW |
106 | b 3b\n\ |
107 | .previous\n\ | |
108 | .section __ex_table,\"a\"\n\ | |
109 | .align 3\n\ | |
110 | " PPC_LONG "1b,4b,2b,4b\n\ | |
111 | .previous" \ | |
37a9d912 | 112 | : "+r" (ret), "=&r" (prev), "+m" (*uaddr) |
69588298 DW |
113 | : "r" (uaddr), "r" (oldval), "r" (newval), "i" (-EFAULT) |
114 | : "cc", "memory"); | |
115 | ||
37a9d912 ML |
116 | *uval = prev; |
117 | return ret; | |
e9056f13 IM |
118 | } |
119 | ||
2ff2ae7a DG |
120 | #endif /* __KERNEL__ */ |
121 | #endif /* _ASM_POWERPC_FUTEX_H */ |