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f5e706ad SR |
1 | #ifndef _SPARC64_FUTEX_H |
2 | #define _SPARC64_FUTEX_H | |
3 | ||
4 | #include <linux/futex.h> | |
5 | #include <linux/uaccess.h> | |
6 | #include <asm/errno.h> | |
7 | #include <asm/system.h> | |
8 | ||
9 | #define __futex_cas_op(insn, ret, oldval, uaddr, oparg) \ | |
10 | __asm__ __volatile__( \ | |
11 | "\n1: lduwa [%3] %%asi, %2\n" \ | |
12 | " " insn "\n" \ | |
13 | "2: casa [%3] %%asi, %2, %1\n" \ | |
14 | " cmp %2, %1\n" \ | |
15 | " bne,pn %%icc, 1b\n" \ | |
16 | " mov 0, %0\n" \ | |
17 | "3:\n" \ | |
18 | " .section .fixup,#alloc,#execinstr\n" \ | |
19 | " .align 4\n" \ | |
20 | "4: sethi %%hi(3b), %0\n" \ | |
21 | " jmpl %0 + %%lo(3b), %%g0\n" \ | |
22 | " mov %5, %0\n" \ | |
23 | " .previous\n" \ | |
24 | " .section __ex_table,\"a\"\n" \ | |
25 | " .align 4\n" \ | |
26 | " .word 1b, 4b\n" \ | |
27 | " .word 2b, 4b\n" \ | |
28 | " .previous\n" \ | |
29 | : "=&r" (ret), "=&r" (oldval), "=&r" (tem) \ | |
30 | : "r" (uaddr), "r" (oparg), "i" (-EFAULT) \ | |
31 | : "memory") | |
32 | ||
33 | static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr) | |
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, tem; | |
40 | ||
41 | if (unlikely(!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))) | |
42 | return -EFAULT; | |
43 | if (unlikely((((unsigned long) uaddr) & 0x3UL))) | |
44 | return -EINVAL; | |
45 | ||
46 | if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) | |
47 | oparg = 1 << oparg; | |
48 | ||
49 | pagefault_disable(); | |
50 | ||
51 | switch (op) { | |
52 | case FUTEX_OP_SET: | |
53 | __futex_cas_op("mov\t%4, %1", ret, oldval, uaddr, oparg); | |
54 | break; | |
55 | case FUTEX_OP_ADD: | |
56 | __futex_cas_op("add\t%2, %4, %1", ret, oldval, uaddr, oparg); | |
57 | break; | |
58 | case FUTEX_OP_OR: | |
59 | __futex_cas_op("or\t%2, %4, %1", ret, oldval, uaddr, oparg); | |
60 | break; | |
61 | case FUTEX_OP_ANDN: | |
62 | __futex_cas_op("and\t%2, %4, %1", ret, oldval, uaddr, oparg); | |
63 | break; | |
64 | case FUTEX_OP_XOR: | |
65 | __futex_cas_op("xor\t%2, %4, %1", ret, oldval, uaddr, oparg); | |
66 | break; | |
67 | default: | |
68 | ret = -ENOSYS; | |
69 | } | |
70 | ||
71 | pagefault_enable(); | |
72 | ||
73 | if (!ret) { | |
74 | switch (cmp) { | |
75 | case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; | |
76 | case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; | |
77 | case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; | |
78 | case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; | |
79 | case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; | |
80 | case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; | |
81 | default: ret = -ENOSYS; | |
82 | } | |
83 | } | |
84 | return ret; | |
85 | } | |
86 | ||
87 | static inline int | |
88 | futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval) | |
89 | { | |
90 | __asm__ __volatile__( | |
91 | "\n1: casa [%3] %%asi, %2, %0\n" | |
92 | "2:\n" | |
93 | " .section .fixup,#alloc,#execinstr\n" | |
94 | " .align 4\n" | |
95 | "3: sethi %%hi(2b), %0\n" | |
96 | " jmpl %0 + %%lo(2b), %%g0\n" | |
97 | " mov %4, %0\n" | |
98 | " .previous\n" | |
99 | " .section __ex_table,\"a\"\n" | |
100 | " .align 4\n" | |
101 | " .word 1b, 3b\n" | |
102 | " .previous\n" | |
103 | : "=r" (newval) | |
104 | : "0" (newval), "r" (oldval), "r" (uaddr), "i" (-EFAULT) | |
105 | : "memory"); | |
106 | ||
107 | return newval; | |
108 | } | |
109 | ||
110 | #endif /* !(_SPARC64_FUTEX_H) */ |