1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef __ASM_SH_FUTEX_H
3*4882a593Smuzhiyun #define __ASM_SH_FUTEX_H
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #include <linux/futex.h>
6*4882a593Smuzhiyun #include <linux/uaccess.h>
7*4882a593Smuzhiyun #include <asm/errno.h>
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #if !defined(CONFIG_SMP)
10*4882a593Smuzhiyun #include <asm/futex-irq.h>
11*4882a593Smuzhiyun #elif defined(CONFIG_CPU_J2)
12*4882a593Smuzhiyun #include <asm/futex-cas.h>
13*4882a593Smuzhiyun #elif defined(CONFIG_CPU_SH4A)
14*4882a593Smuzhiyun #include <asm/futex-llsc.h>
15*4882a593Smuzhiyun #else
16*4882a593Smuzhiyun #error SMP not supported on this configuration.
17*4882a593Smuzhiyun #endif
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun static inline int
futex_atomic_cmpxchg_inatomic(u32 * uval,u32 __user * uaddr,u32 oldval,u32 newval)20*4882a593Smuzhiyun futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
21*4882a593Smuzhiyun u32 oldval, u32 newval)
22*4882a593Smuzhiyun {
23*4882a593Smuzhiyun if (!access_ok(uaddr, sizeof(u32)))
24*4882a593Smuzhiyun return -EFAULT;
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun return atomic_futex_op_cmpxchg_inatomic(uval, uaddr, oldval, newval);
27*4882a593Smuzhiyun }
28*4882a593Smuzhiyun
arch_futex_atomic_op_inuser(int op,u32 oparg,int * oval,u32 __user * uaddr)29*4882a593Smuzhiyun static inline int arch_futex_atomic_op_inuser(int op, u32 oparg, int *oval,
30*4882a593Smuzhiyun u32 __user *uaddr)
31*4882a593Smuzhiyun {
32*4882a593Smuzhiyun u32 oldval, newval, prev;
33*4882a593Smuzhiyun int ret;
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun do {
36*4882a593Smuzhiyun ret = get_user(oldval, uaddr);
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun if (ret) break;
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun switch (op) {
41*4882a593Smuzhiyun case FUTEX_OP_SET:
42*4882a593Smuzhiyun newval = oparg;
43*4882a593Smuzhiyun break;
44*4882a593Smuzhiyun case FUTEX_OP_ADD:
45*4882a593Smuzhiyun newval = oldval + oparg;
46*4882a593Smuzhiyun break;
47*4882a593Smuzhiyun case FUTEX_OP_OR:
48*4882a593Smuzhiyun newval = oldval | oparg;
49*4882a593Smuzhiyun break;
50*4882a593Smuzhiyun case FUTEX_OP_ANDN:
51*4882a593Smuzhiyun newval = oldval & ~oparg;
52*4882a593Smuzhiyun break;
53*4882a593Smuzhiyun case FUTEX_OP_XOR:
54*4882a593Smuzhiyun newval = oldval ^ oparg;
55*4882a593Smuzhiyun break;
56*4882a593Smuzhiyun default:
57*4882a593Smuzhiyun ret = -ENOSYS;
58*4882a593Smuzhiyun break;
59*4882a593Smuzhiyun }
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun if (ret) break;
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun ret = futex_atomic_cmpxchg_inatomic(&prev, uaddr, oldval, newval);
64*4882a593Smuzhiyun } while (!ret && prev != oldval);
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun if (!ret)
67*4882a593Smuzhiyun *oval = oldval;
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun return ret;
70*4882a593Smuzhiyun }
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun #endif /* __ASM_SH_FUTEX_H */
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