1#ifndef _ASM_MICROBLAZE_FUTEX_H
2#define _ASM_MICROBLAZE_FUTEX_H
3
4#ifdef __KERNEL__
5
6#include <linux/futex.h>
7#include <linux/uaccess.h>
8#include <asm/errno.h>
9
10#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
11({ \
12 __asm__ __volatile__ ( \
13 "1: lwx %0, %2, r0; " \
14 insn \
15 "2: swx %1, %2, r0; \
16 addic %1, r0, 0; \
17 bnei %1, 1b; \
18 3: \
19 .section .fixup,\"ax\"; \
20 4: brid 3b; \
21 addik %1, r0, %3; \
22 .previous; \
23 .section __ex_table,\"a\"; \
24 .word 1b,4b,2b,4b; \
25 .previous;" \
26 : "=&r" (oldval), "=&r" (ret) \
27 : "r" (uaddr), "i" (-EFAULT), "r" (oparg) \
28 ); \
29})
30
31static inline int
32futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
33{
34 int op = (encoded_op >> 28) & 7;
35 int cmp = (encoded_op >> 24) & 15;
36 int oparg = (encoded_op << 8) >> 20;
37 int cmparg = (encoded_op << 20) >> 20;
38 int oldval = 0, ret;
39 if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
40 oparg = 1 << oparg;
41
42 if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
43 return -EFAULT;
44
45 pagefault_disable();
46
47 switch (op) {
48 case FUTEX_OP_SET:
49 __futex_atomic_op("or %1,%4,%4;", ret, oldval, uaddr, oparg);
50 break;
51 case FUTEX_OP_ADD:
52 __futex_atomic_op("add %1,%0,%4;", ret, oldval, uaddr, oparg);
53 break;
54 case FUTEX_OP_OR:
55 __futex_atomic_op("or %1,%0,%4;", ret, oldval, uaddr, oparg);
56 break;
57 case FUTEX_OP_ANDN:
58 __futex_atomic_op("andn %1,%0,%4;", ret, oldval, uaddr, oparg);
59 break;
60 case FUTEX_OP_XOR:
61 __futex_atomic_op("xor %1,%0,%4;", ret, oldval, uaddr, oparg);
62 break;
63 default:
64 ret = -ENOSYS;
65 }
66
67 pagefault_enable();
68
69 if (!ret) {
70 switch (cmp) {
71 case FUTEX_OP_CMP_EQ:
72 ret = (oldval == cmparg);
73 break;
74 case FUTEX_OP_CMP_NE:
75 ret = (oldval != cmparg);
76 break;
77 case FUTEX_OP_CMP_LT:
78 ret = (oldval < cmparg);
79 break;
80 case FUTEX_OP_CMP_GE:
81 ret = (oldval >= cmparg);
82 break;
83 case FUTEX_OP_CMP_LE:
84 ret = (oldval <= cmparg);
85 break;
86 case FUTEX_OP_CMP_GT:
87 ret = (oldval > cmparg);
88 break;
89 default:
90 ret = -ENOSYS;
91 }
92 }
93 return ret;
94}
95
96static inline int
97futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
98 u32 oldval, u32 newval)
99{
100 int ret = 0, cmp;
101 u32 prev;
102
103 if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
104 return -EFAULT;
105
106 __asm__ __volatile__ ("1: lwx %1, %3, r0; \
107 cmp %2, %1, %4; \
108 bnei %2, 3f; \
109 2: swx %5, %3, r0; \
110 addic %2, r0, 0; \
111 bnei %2, 1b; \
112 3: \
113 .section .fixup,\"ax\"; \
114 4: brid 3b; \
115 addik %0, r0, %6; \
116 .previous; \
117 .section __ex_table,\"a\"; \
118 .word 1b,4b,2b,4b; \
119 .previous;" \
120 : "+r" (ret), "=&r" (prev), "=&r"(cmp) \
121 : "r" (uaddr), "r" (oldval), "r" (newval), "i" (-EFAULT));
122
123 *uval = prev;
124 return ret;
125}
126
127#endif
128
129#endif
130
