1#ifndef __ASM_SH_FUTEX_H
 2#define __ASM_SH_FUTEX_H
 3
 4#ifdef __KERNEL__
 5
 6#include <linux/futex.h>
 7#include <linux/uaccess.h>
 8#include <asm/errno.h>
 9
10/* XXX: UP variants, fix for SH-4A and SMP.. */
11#include <asm/futex-irq.h>
 
 
 
 
 
 
 
12
13static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
 
 
14{
15	int op = (encoded_op >> 28) & 7;
16	int cmp = (encoded_op >> 24) & 15;
17	int oparg = (encoded_op << 8) >> 20;
18	int cmparg = (encoded_op << 20) >> 20;
19	int oldval = 0, ret;
20
21	if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
22		oparg = 1 << oparg;
23
24	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
25		return -EFAULT;
 
 
 
 
 
 
26
27	pagefault_disable();
28
29	switch (op) {
30	case FUTEX_OP_SET:
31		ret = atomic_futex_op_xchg_set(oparg, uaddr, &oldval);
32		break;
33	case FUTEX_OP_ADD:
34		ret = atomic_futex_op_xchg_add(oparg, uaddr, &oldval);
35		break;
36	case FUTEX_OP_OR:
37		ret = atomic_futex_op_xchg_or(oparg, uaddr, &oldval);
38		break;
39	case FUTEX_OP_ANDN:
40		ret = atomic_futex_op_xchg_and(~oparg, uaddr, &oldval);
41		break;
42	case FUTEX_OP_XOR:
43		ret = atomic_futex_op_xchg_xor(oparg, uaddr, &oldval);
44		break;
45	default:
46		ret = -ENOSYS;
47		break;
48	}
49
50	pagefault_enable();
51
52	if (!ret) {
53		switch (cmp) {
54		case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
55		case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
56		case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
57		case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
58		case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
59		case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
60		default: ret = -ENOSYS;
61		}
62	}
63
64	return ret;
65}
66
67static inline int
68futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
69			      u32 oldval, u32 newval)
70{
71	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
72		return -EFAULT;
73
74	return atomic_futex_op_cmpxchg_inatomic(uval, uaddr, oldval, newval);
 
 
 
75}
76
77#endif /* __KERNEL__ */
78#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#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
19static inline int
20futex_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
29static 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 */