[mirror_ubuntu-bionic-kernel.git] / arch / sh / include / asm / futex.h

#ifndef __ASM_SH_FUTEX_H
#define __ASM_SH_FUTEX_H

#ifdef __KERNEL__

#include <linux/futex.h>
#include <linux/uaccess.h>
#include <asm/errno.h>

#if !defined(CONFIG_SMP)
#include <asm/futex-irq.h>
#elif defined(CONFIG_CPU_J2)
#include <asm/futex-cas.h>
#elif defined(CONFIG_CPU_SH4A)
#include <asm/futex-llsc.h>
#else
#error SMP not supported on this configuration.
#endif

static inline int
futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
			      u32 oldval, u32 newval)
{
	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
		return -EFAULT;

	return atomic_futex_op_cmpxchg_inatomic(uval, uaddr, oldval, newval);
}

static inline int arch_futex_atomic_op_inuser(int op, u32 oparg, int *oval,
		u32 __user *uaddr)
{
	u32 oldval, newval, prev;
	int ret;

	pagefault_disable();

	do {
		if (op == FUTEX_OP_SET)
			ret = oldval = 0;
		else
			ret = get_user(oldval, uaddr);

		if (ret) break;

		switch (op) {
		case FUTEX_OP_SET:
			newval = oparg;
			break;
		case FUTEX_OP_ADD:
			newval = oldval + oparg;
			break;
		case FUTEX_OP_OR:
			newval = oldval | oparg;
			break;
		case FUTEX_OP_ANDN:
			newval = oldval & ~oparg;
			break;
		case FUTEX_OP_XOR:
			newval = oldval ^ oparg;
			break;
		default:
			ret = -ENOSYS;
			break;
		}

		if (ret) break;

		ret = futex_atomic_cmpxchg_inatomic(&prev, uaddr, oldval, newval);
	} while (!ret && prev != oldval);

	pagefault_enable();

	if (!ret)
		*oval = oldval;

	return ret;
}

#endif /* __KERNEL__ */
#endif /* __ASM_SH_FUTEX_H */
Commit	Line	Data
fc1d4c9c KK	1	#ifndef __ASM_SH_FUTEX_H
fc1d4c9c KK	2	#define __ASM_SH_FUTEX_H
4732efbe	3
fc1d4c9c	4	#ifdef __KERNEL__
4732efbe	5
fc1d4c9c	6	#include <linux/futex.h>
730f412c	7	#include <linux/uaccess.h>
fc1d4c9c	8	#include <asm/errno.h>
fc1d4c9c	9
00b73d8d	10	#if !defined(CONFIG_SMP)
fc1d4c9c	11	#include <asm/futex-irq.h>
00b73d8d RF	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
	20	static inline int
	21	futex_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	}
fc1d4c9c	29
30d6e0a4 JS	30	static inline int arch_futex_atomic_op_inuser(int op, u32 oparg, int *oval,
30d6e0a4 JS	31	u32 __user *uaddr)
fc1d4c9c	32	{
00b73d8d RF	33	u32 oldval, newval, prev;
00b73d8d RF	34	int ret;
fc1d4c9c	35
fc1d4c9c KK	36	pagefault_disable();
fc1d4c9c KK	37
00b73d8d RF	38	do {
	39	if (op == FUTEX_OP_SET)
	40	ret = oldval = 0;
	41	else
	42	ret = get_user(oldval, uaddr);
	43
	44	if (ret) break;
	45
	46	switch (op) {
	47	case FUTEX_OP_SET:
	48	newval = oparg;
	49	break;
	50	case FUTEX_OP_ADD:
	51	newval = oldval + oparg;
	52	break;
	53	case FUTEX_OP_OR:
	54	newval = oldval \| oparg;
	55	break;
	56	case FUTEX_OP_ANDN:
	57	newval = oldval & ~oparg;
	58	break;
	59	case FUTEX_OP_XOR:
	60	newval = oldval ^ oparg;
	61	break;
	62	default:
	63	ret = -ENOSYS;
	64	break;
	65	}
	66
	67	if (ret) break;
	68
	69	ret = futex_atomic_cmpxchg_inatomic(&prev, uaddr, oldval, newval);
	70	} while (!ret && prev != oldval);
fc1d4c9c KK	71
	72	pagefault_enable();
	73
30d6e0a4 JS	74	if (!ret)
30d6e0a4 JS	75	*oval = oldval;
fc1d4c9c KK	76
	77	return ret;
	78	}
	79
fc1d4c9c KK	80	#endif /* __KERNEL__ */
fc1d4c9c KK	81	#endif /* __ASM_SH_FUTEX_H */