97 lines
2.0 KiB
C
97 lines
2.0 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
#ifndef _ASM_ALPHA_FUTEX_H
|
||
|
|
#define _ASM_ALPHA_FUTEX_H
|
||
|
|
|
||
|
|
#ifdef __KERNEL__
|
||
|
|
|
||
|
|
#include <linux/futex.h>
|
||
|
|
#include <linux/uaccess.h>
|
||
|
|
#include <asm/errno.h>
|
||
|
|
#include <asm/barrier.h>
|
||
|
|
|
||
|
|
#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
|
||
|
|
__asm__ __volatile__( \
|
||
|
|
__ASM_SMP_MB \
|
||
|
|
"1: ldl_l %0,0(%2)\n" \
|
||
|
|
insn \
|
||
|
|
"2: stl_c %1,0(%2)\n" \
|
||
|
|
" beq %1,4f\n" \
|
||
|
|
" mov $31,%1\n" \
|
||
|
|
"3: .subsection 2\n" \
|
||
|
|
"4: br 1b\n" \
|
||
|
|
" .previous\n" \
|
||
|
|
EXC(1b,3b,$31,%1) \
|
||
|
|
EXC(2b,3b,$31,%1) \
|
||
|
|
: "=&r" (oldval), "=&r"(ret) \
|
||
|
|
: "r" (uaddr), "r"(oparg) \
|
||
|
|
: "memory")
|
||
|
|
|
||
|
|
static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
|
||
|
|
u32 __user *uaddr)
|
||
|
|
{
|
||
|
|
int oldval = 0, ret;
|
||
|
|
|
||
|
|
pagefault_disable();
|
||
|
|
|
||
|
|
switch (op) {
|
||
|
|
case FUTEX_OP_SET:
|
||
|
|
__futex_atomic_op("mov %3,%1\n", ret, oldval, uaddr, oparg);
|
||
|
|
break;
|
||
|
|
case FUTEX_OP_ADD:
|
||
|
|
__futex_atomic_op("addl %0,%3,%1\n", ret, oldval, uaddr, oparg);
|
||
|
|
break;
|
||
|
|
case FUTEX_OP_OR:
|
||
|
|
__futex_atomic_op("or %0,%3,%1\n", ret, oldval, uaddr, oparg);
|
||
|
|
break;
|
||
|
|
case FUTEX_OP_ANDN:
|
||
|
|
__futex_atomic_op("andnot %0,%3,%1\n", ret, oldval, uaddr, oparg);
|
||
|
|
break;
|
||
|
|
case FUTEX_OP_XOR:
|
||
|
|
__futex_atomic_op("xor %0,%3,%1\n", ret, oldval, uaddr, oparg);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
ret = -ENOSYS;
|
||
|
|
}
|
||
|
|
|
||
|
|
pagefault_enable();
|
||
|
|
|
||
|
|
if (!ret)
|
||
|
|
*oval = oldval;
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int
|
||
|
|
futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
|
||
|
|
u32 oldval, u32 newval)
|
||
|
|
{
|
||
|
|
int ret = 0, cmp;
|
||
|
|
u32 prev;
|
||
|
|
|
||
|
|
if (!access_ok(uaddr, sizeof(u32)))
|
||
|
|
return -EFAULT;
|
||
|
|
|
||
|
|
__asm__ __volatile__ (
|
||
|
|
__ASM_SMP_MB
|
||
|
|
"1: ldl_l %1,0(%3)\n"
|
||
|
|
" cmpeq %1,%4,%2\n"
|
||
|
|
" beq %2,3f\n"
|
||
|
|
" mov %5,%2\n"
|
||
|
|
"2: stl_c %2,0(%3)\n"
|
||
|
|
" beq %2,4f\n"
|
||
|
|
"3: .subsection 2\n"
|
||
|
|
"4: br 1b\n"
|
||
|
|
" .previous\n"
|
||
|
|
EXC(1b,3b,$31,%0)
|
||
|
|
EXC(2b,3b,$31,%0)
|
||
|
|
: "+r"(ret), "=&r"(prev), "=&r"(cmp)
|
||
|
|
: "r"(uaddr), "r"((long)(int)oldval), "r"(newval)
|
||
|
|
: "memory");
|
||
|
|
|
||
|
|
*uval = prev;
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* __KERNEL__ */
|
||
|
|
#endif /* _ASM_ALPHA_FUTEX_H */
|