1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ASM_SH_FUTEX_H
3 #define __ASM_SH_FUTEX_H
4
5 #include <linux/futex.h>
6 #include <linux/uaccess.h>
7 #include <asm/errno.h>
8
9 #if !defined(CONFIG_SMP)
10 #include <asm/futex-irq.h>
11 #elif defined(CONFIG_CPU_J2)
12 #include <asm/futex-cas.h>
13 #elif defined(CONFIG_CPU_SH4A)
14 #include <asm/futex-llsc.h>
15 #else
16 #error SMP not supported on this configuration.
17 #endif
18
19 static inline int
20 futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
21 u32 oldval, u32 newval)
22 {
23 if (!access_ok(uaddr, sizeof(u32)))
24 return -EFAULT;
25
26 return atomic_futex_op_cmpxchg_inatomic(uval, uaddr, oldval, newval);
27 }
28
29 static inline int arch_futex_atomic_op_inuser(int op, u32 oparg, int *oval,
30 u32 __user *uaddr)
31 {
32 u32 oldval, newval, prev;
33 int ret;
34
35 do {
36 ret = get_user(oldval, uaddr);
37
38 if (ret) break;
39
40 switch (op) {
41 case FUTEX_OP_SET:
42 newval = oparg;
43 break;
44 case FUTEX_OP_ADD:
45 newval = oldval + oparg;
46 break;
47 case FUTEX_OP_OR:
48 newval = oldval | oparg;
49 break;
50 case FUTEX_OP_ANDN:
51 newval = oldval & ~oparg;
52 break;
53 case FUTEX_OP_XOR:
54 newval = oldval ^ oparg;
55 break;
56 default:
57 ret = -ENOSYS;
58 break;
59 }
60
61 if (ret) break;
62
63 ret = futex_atomic_cmpxchg_inatomic(&prev, uaddr, oldval, newval);
64 } while (!ret && prev != oldval);
65
66 if (!ret)
67 *oval = oldval;
68
69 return ret;
70 }
71
72 #endif /* __ASM_SH_FUTEX_H */
73
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.