5113f6f70
 김현기
kernel add
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
#ifndef _SPARC64_FUTEX_H
#define _SPARC64_FUTEX_H
#include <linux/futex.h>
#include <linux/uaccess.h>
#include <asm/errno.h>
#define __futex_cas_op(insn, ret, oldval, uaddr, oparg) \
__asm__ __volatile__( \
"
1: lduwa [%3] %%asi, %2
" \
" " insn "
" \
"2: casa [%3] %%asi, %2, %1
" \
" cmp %2, %1
" \
" bne,pn %%icc, 1b
" \
" mov 0, %0
" \
"3:
" \
" .section .fixup,#alloc,#execinstr
" \
" .align 4
" \
"4: sethi %%hi(3b), %0
" \
" jmpl %0 + %%lo(3b), %%g0
" \
" mov %5, %0
" \
" .previous
" \
" .section __ex_table,\"a\"
" \
" .align 4
" \
" .word 1b, 4b
" \
" .word 2b, 4b
" \
" .previous
" \
: "=&r" (ret), "=&r" (oldval), "=&r" (tem) \
: "r" (uaddr), "r" (oparg), "i" (-EFAULT) \
: "memory")
static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
{
int op = (encoded_op >> 28) & 7;
int cmp = (encoded_op >> 24) & 15;
int oparg = (encoded_op << 8) >> 20;
int cmparg = (encoded_op << 20) >> 20;
int oldval = 0, ret, tem;
if (unlikely(!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))))
return -EFAULT;
if (unlikely((((unsigned long) uaddr) & 0x3UL)))
return -EINVAL;
if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
oparg = 1 << oparg;
pagefault_disable();
switch (op) {
case FUTEX_OP_SET:
__futex_cas_op("mov\t%4, %1", ret, oldval, uaddr, oparg);
break;
case FUTEX_OP_ADD:
__futex_cas_op("add\t%2, %4, %1", ret, oldval, uaddr, oparg);
break;
case FUTEX_OP_OR:
__futex_cas_op("or\t%2, %4, %1", ret, oldval, uaddr, oparg);
break;
case FUTEX_OP_ANDN:
__futex_cas_op("andn\t%2, %4, %1", ret, oldval, uaddr, oparg);
break;
case FUTEX_OP_XOR:
__futex_cas_op("xor\t%2, %4, %1", ret, oldval, uaddr, oparg);
break;
default:
ret = -ENOSYS;
}
pagefault_enable();
if (!ret) {
switch (cmp) {
case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
default: ret = -ENOSYS;
}
}
return ret;
}
static inline int
futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
u32 oldval, u32 newval)
{
int ret = 0;
__asm__ __volatile__(
"
1: casa [%4] %%asi, %3, %1
"
"2:
"
" .section .fixup,#alloc,#execinstr
"
" .align 4
"
"3: sethi %%hi(2b), %0
"
" jmpl %0 + %%lo(2b), %%g0
"
" mov %5, %0
"
" .previous
"
" .section __ex_table,\"a\"
"
" .align 4
"
" .word 1b, 3b
"
" .previous
"
: "+r" (ret), "=r" (newval)
: "1" (newval), "r" (oldval), "r" (uaddr), "i" (-EFAULT)
: "memory");
*uval = newval;
return ret;
}
#endif /* !(_SPARC64_FUTEX_H) */
|