1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef __ASM_SH_FUTEX_H
 3#define __ASM_SH_FUTEX_H
 4
 5#ifdef __KERNEL__
 6
 7#include <linux/futex.h>
 8#include <linux/uaccess.h>
 9#include <asm/errno.h>
10
11#if !defined(CONFIG_SMP)
12#include <asm/futex-irq.h>
13#elif defined(CONFIG_CPU_J2)
14#include <asm/futex-cas.h>
15#elif defined(CONFIG_CPU_SH4A)
16#include <asm/futex-llsc.h>
17#else
18#error SMP not supported on this configuration.
19#endif
20
21static inline int
22futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
23			      u32 oldval, u32 newval)
24{
25	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
26		return -EFAULT;
27
28	return atomic_futex_op_cmpxchg_inatomic(uval, uaddr, oldval, newval);
29}
30
31static inline int arch_futex_atomic_op_inuser(int op, u32 oparg, int *oval,
32		u32 __user *uaddr)
33{
34	u32 oldval, newval, prev;
35	int ret;
36
37	pagefault_disable();
38
39	do {
40		ret = get_user(oldval, uaddr);
41
42		if (ret) break;
43
44		switch (op) {
45		case FUTEX_OP_SET:
46			newval = oparg;
47			break;
48		case FUTEX_OP_ADD:
49			newval = oldval + oparg;
50			break;
51		case FUTEX_OP_OR:
52			newval = oldval | oparg;
53			break;
54		case FUTEX_OP_ANDN:
55			newval = oldval & ~oparg;
56			break;
57		case FUTEX_OP_XOR:
58			newval = oldval ^ oparg;
59			break;
60		default:
61			ret = -ENOSYS;
62			break;
63		}
64
65		if (ret) break;
66
67		ret = futex_atomic_cmpxchg_inatomic(&prev, uaddr, oldval, newval);
68	} while (!ret && prev != oldval);
69
70	pagefault_enable();
71
72	if (!ret)
73		*oval = oldval;
74
75	return ret;
76}
77
78#endif /* __KERNEL__ */
79#endif /* __ASM_SH_FUTEX_H */

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef __ASM_SH_FUTEX_H
 3#define __ASM_SH_FUTEX_H
 4
 5#ifdef __KERNEL__
 6
 7#include <linux/futex.h>
 8#include <linux/uaccess.h>
 9#include <asm/errno.h>
10
11#if !defined(CONFIG_SMP)
12#include <asm/futex-irq.h>
13#elif defined(CONFIG_CPU_J2)
14#include <asm/futex-cas.h>
15#elif defined(CONFIG_CPU_SH4A)
16#include <asm/futex-llsc.h>
17#else
18#error SMP not supported on this configuration.
19#endif
20
21static inline int
22futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
23			      u32 oldval, u32 newval)
24{
25	if (!access_ok(uaddr, sizeof(u32)))
26		return -EFAULT;
27
28	return atomic_futex_op_cmpxchg_inatomic(uval, uaddr, oldval, newval);
29}
30
31static inline int arch_futex_atomic_op_inuser(int op, u32 oparg, int *oval,
32		u32 __user *uaddr)
33{
34	u32 oldval, newval, prev;
35	int ret;
36
37	pagefault_disable();
38
39	do {
40		ret = get_user(oldval, uaddr);
41
42		if (ret) break;
43
44		switch (op) {
45		case FUTEX_OP_SET:
46			newval = oparg;
47			break;
48		case FUTEX_OP_ADD:
49			newval = oldval + oparg;
50			break;
51		case FUTEX_OP_OR:
52			newval = oldval | oparg;
53			break;
54		case FUTEX_OP_ANDN:
55			newval = oldval & ~oparg;
56			break;
57		case FUTEX_OP_XOR:
58			newval = oldval ^ oparg;
59			break;
60		default:
61			ret = -ENOSYS;
62			break;
63		}
64
65		if (ret) break;
66
67		ret = futex_atomic_cmpxchg_inatomic(&prev, uaddr, oldval, newval);
68	} while (!ret && prev != oldval);
69
70	pagefault_enable();
71
72	if (!ret)
73		*oval = oldval;
74
75	return ret;
76}
77
78#endif /* __KERNEL__ */
79#endif /* __ASM_SH_FUTEX_H */