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
8 #define __futex_cas_op(insn, ret, oldval, uaddr, oparg) \
9 __asm__ __volatile__( \
10 "\n1: lduwa [%3] %%asi, %2\n" \
11 " " insn "\n" \
12 "2: casa [%3] %%asi, %2, %1\n" \
13 " cmp %2, %1\n" \
14 " bne,pn %%icc, 1b\n" \
15 " mov 0, %0\n" \
16 "3:\n" \
17 " .section .fixup,#alloc,#execinstr\n" \
18 " .align 4\n" \
19 "4: sethi %%hi(3b), %0\n" \
20 " jmpl %0 + %%lo(3b), %%g0\n" \
21 " mov %5, %0\n" \
22 " .previous\n" \
23 " .section __ex_table,\"a\"\n" \
24 " .align 4\n" \
25 " .word 1b, 4b\n" \
26 " .word 2b, 4b\n" \
27 " .previous\n" \
28 : "=&r" (ret), "=&r" (oldval), "=&r" (tem) \
29 : "r" (uaddr), "r" (oparg), "i" (-EFAULT) \
30 : "memory")
31
arch_futex_atomic_op_inuser(int op,int oparg,int * oval,u32 __user * uaddr)32 static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
33 u32 __user *uaddr)
34 {
35 int oldval = 0, ret, tem;
36
37 if (unlikely((((unsigned long) uaddr) & 0x3UL)))
38 return -EINVAL;
39
40 pagefault_disable();
41
42 switch (op) {
43 case FUTEX_OP_SET:
44 __futex_cas_op("mov\t%4, %1", ret, oldval, uaddr, oparg);
45 break;
46 case FUTEX_OP_ADD:
47 __futex_cas_op("add\t%2, %4, %1", ret, oldval, uaddr, oparg);
48 break;
49 case FUTEX_OP_OR:
50 __futex_cas_op("or\t%2, %4, %1", ret, oldval, uaddr, oparg);
51 break;
52 case FUTEX_OP_ANDN:
53 __futex_cas_op("andn\t%2, %4, %1", ret, oldval, uaddr, oparg);
54 break;
55 case FUTEX_OP_XOR:
56 __futex_cas_op("xor\t%2, %4, %1", ret, oldval, uaddr, oparg);
57 break;
58 default:
59 ret = -ENOSYS;
60 }
61
62 pagefault_enable();
63
64 if (!ret)
65 *oval = oldval;
66
67 return ret;
68 }
69
70 static inline int
futex_atomic_cmpxchg_inatomic(u32 * uval,u32 __user * uaddr,u32 oldval,u32 newval)71 futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
72 u32 oldval, u32 newval)
73 {
74 int ret = 0;
75
76 __asm__ __volatile__(
77 "\n1: casa [%4] %%asi, %3, %1\n"
78 "2:\n"
79 " .section .fixup,#alloc,#execinstr\n"
80 " .align 4\n"
81 "3: sethi %%hi(2b), %0\n"
82 " jmpl %0 + %%lo(2b), %%g0\n"
83 " mov %5, %0\n"
84 " .previous\n"
85 " .section __ex_table,\"a\"\n"
86 " .align 4\n"
87 " .word 1b, 3b\n"
88 " .previous\n"
89 : "+r" (ret), "=r" (newval)
90 : "1" (newval), "r" (oldval), "r" (uaddr), "i" (-EFAULT)
91 : "memory");
92
93 *uval = newval;
94 return ret;
95 }
96
97 #endif /* !(_SPARC64_FUTEX_H) */
98