This source file includes following definitions.
- futex_atomic_cmpxchg_inatomic
- arch_futex_atomic_op_inuser
1
2
3
4 #ifndef __NDS32_FUTEX_H__
5 #define __NDS32_FUTEX_H__
6
7 #include <linux/futex.h>
8 #include <linux/uaccess.h>
9 #include <asm/errno.h>
10
11 #define __futex_atomic_ex_table(err_reg) \
12 " .pushsection __ex_table,\"a\"\n" \
13 " .align 3\n" \
14 " .long 1b, 4f\n" \
15 " .long 2b, 4f\n" \
16 " .popsection\n" \
17 " .pushsection .fixup,\"ax\"\n" \
18 "4: move %0, " err_reg "\n" \
19 " b 3b\n" \
20 " .popsection"
21
22 #define __futex_atomic_op(insn, ret, oldval, tmp, uaddr, oparg) \
23 smp_mb(); \
24 asm volatile( \
25 " movi $ta, #0\n" \
26 "1: llw %1, [%2+$ta]\n" \
27 " " insn "\n" \
28 "2: scw %0, [%2+$ta]\n" \
29 " beqz %0, 1b\n" \
30 " movi %0, #0\n" \
31 "3:\n" \
32 __futex_atomic_ex_table("%4") \
33 : "=&r" (ret), "=&r" (oldval) \
34 : "r" (uaddr), "r" (oparg), "i" (-EFAULT) \
35 : "cc", "memory")
36 static inline int
37 futex_atomic_cmpxchg_inatomic(u32 * uval, u32 __user * uaddr,
38 u32 oldval, u32 newval)
39 {
40 int ret = 0;
41 u32 val, tmp, flags;
42
43 if (!access_ok(uaddr, sizeof(u32)))
44 return -EFAULT;
45
46 smp_mb();
47 asm volatile (" movi $ta, #0\n"
48 "1: llw %1, [%6 + $ta]\n"
49 " sub %3, %1, %4\n"
50 " cmovz %2, %5, %3\n"
51 " cmovn %2, %1, %3\n"
52 "2: scw %2, [%6 + $ta]\n"
53 " beqz %2, 1b\n"
54 "3:\n " __futex_atomic_ex_table("%7")
55 :"+&r"(ret), "=&r"(val), "=&r"(tmp), "=&r"(flags)
56 :"r"(oldval), "r"(newval), "r"(uaddr), "i"(-EFAULT)
57 :"$ta", "memory");
58 smp_mb();
59
60 *uval = val;
61 return ret;
62 }
63
64 static inline int
65 arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
66 {
67 int oldval = 0, ret;
68
69
70 pagefault_disable();
71 switch (op) {
72 case FUTEX_OP_SET:
73 __futex_atomic_op("move %0, %3", ret, oldval, tmp, uaddr,
74 oparg);
75 break;
76 case FUTEX_OP_ADD:
77 __futex_atomic_op("add %0, %1, %3", ret, oldval, tmp, uaddr,
78 oparg);
79 break;
80 case FUTEX_OP_OR:
81 __futex_atomic_op("or %0, %1, %3", ret, oldval, tmp, uaddr,
82 oparg);
83 break;
84 case FUTEX_OP_ANDN:
85 __futex_atomic_op("and %0, %1, %3", ret, oldval, tmp, uaddr,
86 ~oparg);
87 break;
88 case FUTEX_OP_XOR:
89 __futex_atomic_op("xor %0, %1, %3", ret, oldval, tmp, uaddr,
90 oparg);
91 break;
92 default:
93 ret = -ENOSYS;
94 }
95
96 pagefault_enable();
97
98 if (!ret)
99 *oval = oldval;
100
101 return ret;
102 }
103 #endif