Commit | Line | Data |
---|---|---|
4732efbe JJ |
1 | #ifndef _ASM_FUTEX_H |
2 | #define _ASM_FUTEX_H | |
3 | ||
a192dc16 | 4 | #include <linux/futex.h> |
730f412c | 5 | #include <linux/uaccess.h> |
a192dc16 | 6 | #include <asm/errno.h> |
4732efbe | 7 | |
a192dc16 JJ |
8 | #define __futex_atomic_op1(insn, ret, oldval, uaddr, oparg) \ |
9 | do { \ | |
10 | register unsigned long r8 __asm ("r8") = 0; \ | |
11 | __asm__ __volatile__( \ | |
12 | " mf;; \n" \ | |
13 | "[1:] " insn ";; \n" \ | |
14 | " .xdata4 \"__ex_table\", 1b-., 2f-. \n" \ | |
15 | "[2:]" \ | |
16 | : "+r" (r8), "=r" (oldval) \ | |
17 | : "r" (uaddr), "r" (oparg) \ | |
18 | : "memory"); \ | |
19 | ret = r8; \ | |
20 | } while (0) | |
21 | ||
22 | #define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg) \ | |
23 | do { \ | |
24 | register unsigned long r8 __asm ("r8") = 0; \ | |
25 | int val, newval; \ | |
26 | do { \ | |
27 | __asm__ __volatile__( \ | |
28 | " mf;; \n" \ | |
29 | "[1:] ld4 %3=[%4];; \n" \ | |
30 | " mov %2=%3 \n" \ | |
31 | insn ";; \n" \ | |
32 | " mov ar.ccv=%2;; \n" \ | |
33 | "[2:] cmpxchg4.acq %1=[%4],%3,ar.ccv;; \n" \ | |
34 | " .xdata4 \"__ex_table\", 1b-., 3f-.\n" \ | |
35 | " .xdata4 \"__ex_table\", 2b-., 3f-.\n" \ | |
36 | "[3:]" \ | |
37 | : "+r" (r8), "=r" (val), "=&r" (oldval), \ | |
38 | "=&r" (newval) \ | |
39 | : "r" (uaddr), "r" (oparg) \ | |
40 | : "memory"); \ | |
41 | if (unlikely (r8)) \ | |
42 | break; \ | |
43 | } while (unlikely (val != oldval)); \ | |
44 | ret = r8; \ | |
45 | } while (0) | |
46 | ||
47 | static inline int | |
8d7718aa | 48 | futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr) |
a192dc16 JJ |
49 | { |
50 | int op = (encoded_op >> 28) & 7; | |
51 | int cmp = (encoded_op >> 24) & 15; | |
52 | int oparg = (encoded_op << 8) >> 20; | |
53 | int cmparg = (encoded_op << 20) >> 20; | |
54 | int oldval = 0, ret; | |
55 | if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) | |
56 | oparg = 1 << oparg; | |
57 | ||
8d7718aa | 58 | if (! access_ok (VERIFY_WRITE, uaddr, sizeof(u32))) |
a192dc16 JJ |
59 | return -EFAULT; |
60 | ||
a866374a | 61 | pagefault_disable(); |
a192dc16 JJ |
62 | |
63 | switch (op) { | |
64 | case FUTEX_OP_SET: | |
65 | __futex_atomic_op1("xchg4 %1=[%2],%3", ret, oldval, uaddr, | |
66 | oparg); | |
67 | break; | |
68 | case FUTEX_OP_ADD: | |
69 | __futex_atomic_op2("add %3=%3,%5", ret, oldval, uaddr, oparg); | |
70 | break; | |
71 | case FUTEX_OP_OR: | |
72 | __futex_atomic_op2("or %3=%3,%5", ret, oldval, uaddr, oparg); | |
73 | break; | |
74 | case FUTEX_OP_ANDN: | |
75 | __futex_atomic_op2("and %3=%3,%5", ret, oldval, uaddr, | |
76 | ~oparg); | |
77 | break; | |
78 | case FUTEX_OP_XOR: | |
79 | __futex_atomic_op2("xor %3=%3,%5", ret, oldval, uaddr, oparg); | |
80 | break; | |
81 | default: | |
82 | ret = -ENOSYS; | |
83 | } | |
84 | ||
a866374a | 85 | pagefault_enable(); |
a192dc16 JJ |
86 | |
87 | if (!ret) { | |
88 | switch (cmp) { | |
89 | case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; | |
90 | case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; | |
91 | case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; | |
92 | case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; | |
93 | case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; | |
94 | case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; | |
95 | default: ret = -ENOSYS; | |
96 | } | |
97 | } | |
98 | return ret; | |
99 | } | |
100 | ||
101 | static inline int | |
8d7718aa ML |
102 | futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, |
103 | u32 oldval, u32 newval) | |
a192dc16 | 104 | { |
8d7718aa | 105 | if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))) |
a192dc16 JJ |
106 | return -EFAULT; |
107 | ||
108 | { | |
136f39dd | 109 | register unsigned long r8 __asm ("r8") = 0; |
37a9d912 | 110 | unsigned long prev; |
a192dc16 JJ |
111 | __asm__ __volatile__( |
112 | " mf;; \n" | |
c76f39bd LT |
113 | " mov ar.ccv=%4;; \n" |
114 | "[1:] cmpxchg4.acq %1=[%2],%3,ar.ccv \n" | |
a192dc16 JJ |
115 | " .xdata4 \"__ex_table\", 1b-., 2f-. \n" |
116 | "[2:]" | |
136f39dd | 117 | : "+r" (r8), "=&r" (prev) |
a192dc16 JJ |
118 | : "r" (uaddr), "r" (newval), |
119 | "rO" ((long) (unsigned) oldval) | |
120 | : "memory"); | |
37a9d912 | 121 | *uval = prev; |
a192dc16 JJ |
122 | return r8; |
123 | } | |
124 | } | |
125 | ||
126 | #endif /* _ASM_FUTEX_H */ |