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
32static inline int futex_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, tem;
39
40 if (unlikely(!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))))
41 return -EFAULT;
42 if (unlikely((((unsigned long) uaddr) & 0x3UL)))
43 return -EINVAL;
44
45 if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
46 oparg = 1 << oparg;
47
48 pagefault_disable();
49
50 switch (op) {
51 case FUTEX_OP_SET:
52 __futex_cas_op("mov\t%4, %1", ret, oldval, uaddr, oparg);
53 break;
54 case FUTEX_OP_ADD:
55 __futex_cas_op("add\t%2, %4, %1", ret, oldval, uaddr, oparg);
56 break;
57 case FUTEX_OP_OR:
58 __futex_cas_op("or\t%2, %4, %1", ret, oldval, uaddr, oparg);
59 break;
60 case FUTEX_OP_ANDN:
61 __futex_cas_op("andn\t%2, %4, %1", ret, oldval, uaddr, oparg);
62 break;
63 case FUTEX_OP_XOR:
64 __futex_cas_op("xor\t%2, %4, %1", ret, oldval, uaddr, oparg);
65 break;
66 default:
67 ret = -ENOSYS;
68 }
69
70 pagefault_enable();
71
72 if (!ret) {
73 switch (cmp) {
74 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
75 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
76 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
77 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
78 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
79 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
80 default: ret = -ENOSYS;
81 }
82 }
83 return ret;
84}
85
86static inline int
87futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
88 u32 oldval, u32 newval)
89{
90 int ret = 0;
91
92 __asm__ __volatile__(
93 "\n1: casa [%4] %%asi, %3, %1\n"
94 "2:\n"
95 " .section .fixup,#alloc,#execinstr\n"
96 " .align 4\n"
97 "3: sethi %%hi(2b), %0\n"
98 " jmpl %0 + %%lo(2b), %%g0\n"
99 " mov %5, %0\n"
100 " .previous\n"
101 " .section __ex_table,\"a\"\n"
102 " .align 4\n"
103 " .word 1b, 3b\n"
104 " .previous\n"
105 : "+r" (ret), "=r" (newval)
106 : "1" (newval), "r" (oldval), "r" (uaddr), "i" (-EFAULT)
107 : "memory");
108
109 *uval = newval;
110 return ret;
111}
112
113#endif
114
