78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
#ifndef _ASM_PARISC_FUTEX_H
|
|
#define _ASM_PARISC_FUTEX_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/futex.h>
|
|
#include <asm/errno.h>
|
|
#include <asm/uaccess.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;
|
|
}
|
|
|
|
/* Non-atomic version */
|
|
static inline int
|
|
futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
|
|
{
|
|
int err = 0;
|
|
int uval;
|
|
|
|
/* futex.c wants to do a cmpxchg_inatomic on kernel NULL, which is
|
|
* our gateway page, and causes no end of trouble...
|
|
*/
|
|
if (segment_eq(KERNEL_DS, get_fs()) && !uaddr)
|
|
return -EFAULT;
|
|
|
|
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
|
|
return -EFAULT;
|
|
|
|
err = get_user(uval, uaddr);
|
|
if (err) return -EFAULT;
|
|
if (uval == oldval)
|
|
err = put_user(newval, uaddr);
|
|
if (err) return -EFAULT;
|
|
return uval;
|
|
}
|
|
|
|
#endif /*__KERNEL__*/
|
|
#endif /*_ASM_PARISC_FUTEX_H*/
|