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3363fbdd MS |
1 | #ifndef _ASM_S390_FUTEX_H |
2 | #define _ASM_S390_FUTEX_H | |
4732efbe | 3 | |
d8ad075e | 4 | #include <linux/uaccess.h> |
457f2180 HC |
5 | #include <linux/futex.h> |
6 | #include <asm/mmu_context.h> | |
3363fbdd | 7 | #include <asm/errno.h> |
3363fbdd | 8 | |
457f2180 HC |
9 | #define __futex_atomic_op(insn, ret, oldval, newval, uaddr, oparg) \ |
10 | asm volatile( \ | |
11 | " sacf 256\n" \ | |
12 | "0: l %1,0(%6)\n" \ | |
13 | "1:"insn \ | |
14 | "2: cs %1,%2,0(%6)\n" \ | |
15 | "3: jl 1b\n" \ | |
16 | " lhi %0,0\n" \ | |
17 | "4: sacf 768\n" \ | |
18 | EX_TABLE(0b,4b) EX_TABLE(2b,4b) EX_TABLE(3b,4b) \ | |
19 | : "=d" (ret), "=&d" (oldval), "=&d" (newval), \ | |
20 | "=m" (*uaddr) \ | |
21 | : "0" (-EFAULT), "d" (oparg), "a" (uaddr), \ | |
22 | "m" (*uaddr) : "cc"); | |
4f41c2b4 HC |
23 | |
24 | static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr) | |
3363fbdd MS |
25 | { |
26 | int op = (encoded_op >> 28) & 7; | |
27 | int cmp = (encoded_op >> 24) & 15; | |
28 | int oparg = (encoded_op << 8) >> 20; | |
29 | int cmparg = (encoded_op << 20) >> 20; | |
457f2180 | 30 | int oldval = 0, newval, ret; |
d02765d1 | 31 | |
beef560b | 32 | load_kernel_asce(); |
3363fbdd MS |
33 | if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) |
34 | oparg = 1 << oparg; | |
35 | ||
d8ad075e | 36 | pagefault_disable(); |
457f2180 HC |
37 | switch (op) { |
38 | case FUTEX_OP_SET: | |
39 | __futex_atomic_op("lr %2,%5\n", | |
40 | ret, oldval, newval, uaddr, oparg); | |
41 | break; | |
42 | case FUTEX_OP_ADD: | |
43 | __futex_atomic_op("lr %2,%1\nar %2,%5\n", | |
44 | ret, oldval, newval, uaddr, oparg); | |
45 | break; | |
46 | case FUTEX_OP_OR: | |
47 | __futex_atomic_op("lr %2,%1\nor %2,%5\n", | |
48 | ret, oldval, newval, uaddr, oparg); | |
49 | break; | |
50 | case FUTEX_OP_ANDN: | |
51 | __futex_atomic_op("lr %2,%1\nnr %2,%5\n", | |
52 | ret, oldval, newval, uaddr, oparg); | |
53 | break; | |
54 | case FUTEX_OP_XOR: | |
55 | __futex_atomic_op("lr %2,%1\nxr %2,%5\n", | |
56 | ret, oldval, newval, uaddr, oparg); | |
57 | break; | |
58 | default: | |
59 | ret = -ENOSYS; | |
60 | } | |
d8ad075e | 61 | pagefault_enable(); |
3363fbdd MS |
62 | |
63 | if (!ret) { | |
64 | switch (cmp) { | |
65 | case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; | |
66 | case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; | |
67 | case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; | |
68 | case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; | |
69 | case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; | |
70 | case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; | |
71 | default: ret = -ENOSYS; | |
72 | } | |
73 | } | |
74 | return ret; | |
75 | } | |
76 | ||
457f2180 HC |
77 | static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, |
78 | u32 oldval, u32 newval) | |
79 | { | |
80 | int ret; | |
81 | ||
beef560b | 82 | load_kernel_asce(); |
457f2180 HC |
83 | asm volatile( |
84 | " sacf 256\n" | |
85 | "0: cs %1,%4,0(%5)\n" | |
86 | "1: la %0,0\n" | |
87 | "2: sacf 768\n" | |
88 | EX_TABLE(0b,2b) EX_TABLE(1b,2b) | |
89 | : "=d" (ret), "+d" (oldval), "=m" (*uaddr) | |
90 | : "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr) | |
91 | : "cc", "memory"); | |
92 | *uval = oldval; | |
93 | return ret; | |
94 | } | |
95 | ||
3363fbdd | 96 | #endif /* _ASM_S390_FUTEX_H */ |