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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> | |
7 | #include <asm/errno.h> | |
feaf7cf1 | 8 | #include <asm/synch.h> |
4732efbe | 9 | #include <asm/uaccess.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 ( \ |
144b9c13 | 14 | LWSYNC_ON_SMP \ |
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" \ | |
20 | "li %1,0\n" \ | |
21 | "3: .section .fixup,\"ax\"\n" \ | |
22 | "4: li %1,%3\n" \ | |
23 | "b 3b\n" \ | |
24 | ".previous\n" \ | |
25 | ".section __ex_table,\"a\"\n" \ | |
26 | ".align 3\n" \ | |
3ddfbcf1 | 27 | PPC_LONG "1b,4b,2b,4b\n" \ |
2ff2ae7a DG |
28 | ".previous" \ |
29 | : "=&r" (oldval), "=&r" (ret) \ | |
30 | : "b" (uaddr), "i" (-EFAULT), "1" (oparg) \ | |
4732efbe JJ |
31 | : "cr0", "memory") |
32 | ||
2ff2ae7a | 33 | static inline int futex_atomic_op_inuser (int encoded_op, int __user *uaddr) |
4732efbe JJ |
34 | { |
35 | int op = (encoded_op >> 28) & 7; | |
36 | int cmp = (encoded_op >> 24) & 15; | |
37 | int oparg = (encoded_op << 8) >> 20; | |
38 | int cmparg = (encoded_op << 20) >> 20; | |
39 | int oldval = 0, ret; | |
40 | if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) | |
41 | oparg = 1 << oparg; | |
42 | ||
43 | if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int))) | |
44 | return -EFAULT; | |
45 | ||
46 | inc_preempt_count(); | |
47 | ||
48 | switch (op) { | |
49 | case FUTEX_OP_SET: | |
50 | __futex_atomic_op("", ret, oldval, uaddr, oparg); | |
51 | break; | |
52 | case FUTEX_OP_ADD: | |
53 | __futex_atomic_op("add %1,%0,%1\n", ret, oldval, uaddr, oparg); | |
54 | break; | |
55 | case FUTEX_OP_OR: | |
56 | __futex_atomic_op("or %1,%0,%1\n", ret, oldval, uaddr, oparg); | |
57 | break; | |
58 | case FUTEX_OP_ANDN: | |
59 | __futex_atomic_op("andc %1,%0,%1\n", ret, oldval, uaddr, oparg); | |
60 | break; | |
61 | case FUTEX_OP_XOR: | |
62 | __futex_atomic_op("xor %1,%0,%1\n", ret, oldval, uaddr, oparg); | |
63 | break; | |
64 | default: | |
65 | ret = -ENOSYS; | |
66 | } | |
67 | ||
68 | dec_preempt_count(); | |
69 | ||
70 | if (!ret) { | |
71 | switch (cmp) { | |
72 | case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; | |
73 | case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; | |
74 | case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; | |
75 | case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; | |
76 | case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; | |
77 | case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; | |
78 | default: ret = -ENOSYS; | |
79 | } | |
80 | } | |
81 | return ret; | |
82 | } | |
83 | ||
2ff2ae7a DG |
84 | #endif /* __KERNEL__ */ |
85 | #endif /* _ASM_POWERPC_FUTEX_H */ |