[net-next-2.6.git] / include / asm-generic / futex.h

#ifndef _ASM_GENERIC_FUTEX_H
#define _ASM_GENERIC_FUTEX_H

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

static inline int
futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
{
	int op = (encoded_op >> 28) & 7;
	int cmp = (encoded_op >> 24) & 15;
	int oparg = (encoded_op << 8) >> 20;
	int cmparg = (encoded_op << 20) >> 20;
	int oldval = 0, ret;
	if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
		oparg = 1 << oparg;

	if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
		return -EFAULT;

	pagefault_disable();

	switch (op) {
	case FUTEX_OP_SET:
	case FUTEX_OP_ADD:
	case FUTEX_OP_OR:
	case FUTEX_OP_ANDN:
	case FUTEX_OP_XOR:
	default:
		ret = -ENOSYS;
	}

	pagefault_enable();

	if (!ret) {
		switch (cmp) {
		case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
		case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
		case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
		case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
		case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
		case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
		default: ret = -ENOSYS;
		}
	}
	return ret;
}

static inline int
futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
{
	return -ENOSYS;
}

#endif
Commit	Line	Data
f8aaeace JD	1	#ifndef _ASM_GENERIC_FUTEX_H
	2	#define _ASM_GENERIC_FUTEX_H
	3
f8aaeace	4	#include <linux/futex.h>
730f412c	5	#include <linux/uaccess.h>
f8aaeace	6	#include <asm/errno.h>
f8aaeace JD	7
	8	static inline int
	9	futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
	10	{
	11	int op = (encoded_op >> 28) & 7;
	12	int cmp = (encoded_op >> 24) & 15;
	13	int oparg = (encoded_op << 8) >> 20;
	14	int cmparg = (encoded_op << 20) >> 20;
	15	int oldval = 0, ret;
	16	if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
	17	oparg = 1 << oparg;
	18
	19	if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
	20	return -EFAULT;
	21
a866374a	22	pagefault_disable();
f8aaeace JD	23
	24	switch (op) {
	25	case FUTEX_OP_SET:
	26	case FUTEX_OP_ADD:
	27	case FUTEX_OP_OR:
	28	case FUTEX_OP_ANDN:
	29	case FUTEX_OP_XOR:
	30	default:
	31	ret = -ENOSYS;
	32	}
	33
a866374a	34	pagefault_enable();
f8aaeace JD	35
	36	if (!ret) {
	37	switch (cmp) {
	38	case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
	39	case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
	40	case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
	41	case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
	42	case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
	43	case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
	44	default: ret = -ENOSYS;
	45	}
	46	}
	47	return ret;
	48	}
	49
e9056f13	50	static inline int
8f17d3a5	51	futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
e9056f13 IM	52	{
	53	return -ENOSYS;
	54	}
	55
f8aaeace	56	#endif