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-rw-r--r--arch/mips/include/asm/futex.h203
1 files changed, 203 insertions, 0 deletions
diff --git a/arch/mips/include/asm/futex.h b/arch/mips/include/asm/futex.h
new file mode 100644
index 000000000000..b9cce90346cf
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+++ b/arch/mips/include/asm/futex.h
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1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (c) 2006 Ralf Baechle (ralf@linux-mips.org)
7 */
8#ifndef _ASM_FUTEX_H
9#define _ASM_FUTEX_H
10
11#ifdef __KERNEL__
12
13#include <linux/futex.h>
14#include <linux/uaccess.h>
15#include <asm/barrier.h>
16#include <asm/errno.h>
17#include <asm/war.h>
18
19#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
20{ \
21 if (cpu_has_llsc && R10000_LLSC_WAR) { \
22 __asm__ __volatile__( \
23 " .set push \n" \
24 " .set noat \n" \
25 " .set mips3 \n" \
26 "1: ll %1, %4 # __futex_atomic_op \n" \
27 " .set mips0 \n" \
28 " " insn " \n" \
29 " .set mips3 \n" \
30 "2: sc $1, %2 \n" \
31 " beqzl $1, 1b \n" \
32 __WEAK_LLSC_MB \
33 "3: \n" \
34 " .set pop \n" \
35 " .set mips0 \n" \
36 " .section .fixup,\"ax\" \n" \
37 "4: li %0, %6 \n" \
38 " j 3b \n" \
39 " .previous \n" \
40 " .section __ex_table,\"a\" \n" \
41 " "__UA_ADDR "\t1b, 4b \n" \
42 " "__UA_ADDR "\t2b, 4b \n" \
43 " .previous \n" \
44 : "=r" (ret), "=&r" (oldval), "=R" (*uaddr) \
45 : "0" (0), "R" (*uaddr), "Jr" (oparg), "i" (-EFAULT) \
46 : "memory"); \
47 } else if (cpu_has_llsc) { \
48 __asm__ __volatile__( \
49 " .set push \n" \
50 " .set noat \n" \
51 " .set mips3 \n" \
52 "1: ll %1, %4 # __futex_atomic_op \n" \
53 " .set mips0 \n" \
54 " " insn " \n" \
55 " .set mips3 \n" \
56 "2: sc $1, %2 \n" \
57 " beqz $1, 1b \n" \
58 __WEAK_LLSC_MB \
59 "3: \n" \
60 " .set pop \n" \
61 " .set mips0 \n" \
62 " .section .fixup,\"ax\" \n" \
63 "4: li %0, %6 \n" \
64 " j 3b \n" \
65 " .previous \n" \
66 " .section __ex_table,\"a\" \n" \
67 " "__UA_ADDR "\t1b, 4b \n" \
68 " "__UA_ADDR "\t2b, 4b \n" \
69 " .previous \n" \
70 : "=r" (ret), "=&r" (oldval), "=R" (*uaddr) \
71 : "0" (0), "R" (*uaddr), "Jr" (oparg), "i" (-EFAULT) \
72 : "memory"); \
73 } else \
74 ret = -ENOSYS; \
75}
76
77static inline int
78futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
79{
80 int op = (encoded_op >> 28) & 7;
81 int cmp = (encoded_op >> 24) & 15;
82 int oparg = (encoded_op << 8) >> 20;
83 int cmparg = (encoded_op << 20) >> 20;
84 int oldval = 0, ret;
85 if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
86 oparg = 1 << oparg;
87
88 if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
89 return -EFAULT;
90
91 pagefault_disable();
92
93 switch (op) {
94 case FUTEX_OP_SET:
95 __futex_atomic_op("move $1, %z5", ret, oldval, uaddr, oparg);
96 break;
97
98 case FUTEX_OP_ADD:
99 __futex_atomic_op("addu $1, %1, %z5",
100 ret, oldval, uaddr, oparg);
101 break;
102 case FUTEX_OP_OR:
103 __futex_atomic_op("or $1, %1, %z5",
104 ret, oldval, uaddr, oparg);
105 break;
106 case FUTEX_OP_ANDN:
107 __futex_atomic_op("and $1, %1, %z5",
108 ret, oldval, uaddr, ~oparg);
109 break;
110 case FUTEX_OP_XOR:
111 __futex_atomic_op("xor $1, %1, %z5",
112 ret, oldval, uaddr, oparg);
113 break;
114 default:
115 ret = -ENOSYS;
116 }
117
118 pagefault_enable();
119
120 if (!ret) {
121 switch (cmp) {
122 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
123 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
124 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
125 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
126 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
127 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
128 default: ret = -ENOSYS;
129 }
130 }
131 return ret;
132}
133
134static inline int
135futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
136{
137 int retval;
138
139 if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
140 return -EFAULT;
141
142 if (cpu_has_llsc && R10000_LLSC_WAR) {
143 __asm__ __volatile__(
144 "# futex_atomic_cmpxchg_inatomic \n"
145 " .set push \n"
146 " .set noat \n"
147 " .set mips3 \n"
148 "1: ll %0, %2 \n"
149 " bne %0, %z3, 3f \n"
150 " .set mips0 \n"
151 " move $1, %z4 \n"
152 " .set mips3 \n"
153 "2: sc $1, %1 \n"
154 " beqzl $1, 1b \n"
155 __WEAK_LLSC_MB
156 "3: \n"
157 " .set pop \n"
158 " .section .fixup,\"ax\" \n"
159 "4: li %0, %5 \n"
160 " j 3b \n"
161 " .previous \n"
162 " .section __ex_table,\"a\" \n"
163 " "__UA_ADDR "\t1b, 4b \n"
164 " "__UA_ADDR "\t2b, 4b \n"
165 " .previous \n"
166 : "=&r" (retval), "=R" (*uaddr)
167 : "R" (*uaddr), "Jr" (oldval), "Jr" (newval), "i" (-EFAULT)
168 : "memory");
169 } else if (cpu_has_llsc) {
170 __asm__ __volatile__(
171 "# futex_atomic_cmpxchg_inatomic \n"
172 " .set push \n"
173 " .set noat \n"
174 " .set mips3 \n"
175 "1: ll %0, %2 \n"
176 " bne %0, %z3, 3f \n"
177 " .set mips0 \n"
178 " move $1, %z4 \n"
179 " .set mips3 \n"
180 "2: sc $1, %1 \n"
181 " beqz $1, 1b \n"
182 __WEAK_LLSC_MB
183 "3: \n"
184 " .set pop \n"
185 " .section .fixup,\"ax\" \n"
186 "4: li %0, %5 \n"
187 " j 3b \n"
188 " .previous \n"
189 " .section __ex_table,\"a\" \n"
190 " "__UA_ADDR "\t1b, 4b \n"
191 " "__UA_ADDR "\t2b, 4b \n"
192 " .previous \n"
193 : "=&r" (retval), "=R" (*uaddr)
194 : "R" (*uaddr), "Jr" (oldval), "Jr" (newval), "i" (-EFAULT)
195 : "memory");
196 } else
197 return -ENOSYS;
198
199 return retval;
200}
201
202#endif
203#endif /* _ASM_FUTEX_H */
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