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#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#if !defined(CONFIG_SMP)
11#include <asm/futex-irq.h>
12#elif defined(CONFIG_CPU_J2)
13#include <asm/futex-cas.h>
14#elif defined(CONFIG_CPU_SH4A)
15#include <asm/futex-llsc.h>
16#else
17#error SMP not supported on this configuration.
18#endif
19
20static inline int
21futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
22			      u32 oldval, u32 newval)
23{
24	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
25		return -EFAULT;
26
27	return atomic_futex_op_cmpxchg_inatomic(uval, uaddr, oldval, newval);
28}
29
30static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
 
31{
32	int op = (encoded_op >> 28) & 7;
33	int cmp = (encoded_op >> 24) & 15;
34	u32 oparg = (encoded_op << 8) >> 20;
35	u32 cmparg = (encoded_op << 20) >> 20;
36	u32 oldval, newval, prev;
37	int ret;
38
39	if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
40		oparg = 1 << oparg;
41
42	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
43		return -EFAULT;
44
45	pagefault_disable();
46
47	do {
48		if (op == FUTEX_OP_SET)
49			ret = oldval = 0;
50		else
51			ret = get_user(oldval, uaddr);
52
53		if (ret) break;
54
55		switch (op) {
56		case FUTEX_OP_SET:
57			newval = oparg;
58			break;
59		case FUTEX_OP_ADD:
60			newval = oldval + oparg;
61			break;
62		case FUTEX_OP_OR:
63			newval = oldval | oparg;
64			break;
65		case FUTEX_OP_ANDN:
66			newval = oldval & ~oparg;
67			break;
68		case FUTEX_OP_XOR:
69			newval = oldval ^ oparg;
70			break;
71		default:
72			ret = -ENOSYS;
73			break;
74		}
75
76		if (ret) break;
77
78		ret = futex_atomic_cmpxchg_inatomic(&prev, uaddr, oldval, newval);
79	} while (!ret && prev != oldval);
80
81	pagefault_enable();
82
83	if (!ret) {
84		switch (cmp) {
85		case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
86		case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
87		case FUTEX_OP_CMP_LT: ret = ((int)oldval < (int)cmparg); break;
88		case FUTEX_OP_CMP_GE: ret = ((int)oldval >= (int)cmparg); break;
89		case FUTEX_OP_CMP_LE: ret = ((int)oldval <= (int)cmparg); break;
90		case FUTEX_OP_CMP_GT: ret = ((int)oldval > (int)cmparg); break;
91		default: ret = -ENOSYS;
92		}
93	}
94
95	return ret;
96}
97
98#endif /* __KERNEL__ */
99#endif /* __ASM_SH_FUTEX_H */