105 lines
2.2 KiB
C
105 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __ASM_OPENRISC_FUTEX_H
|
|
#define __ASM_OPENRISC_FUTEX_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/futex.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/errno.h>
|
|
|
|
#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
|
|
({ \
|
|
__asm__ __volatile__ ( \
|
|
"1: l.lwa %0, %2 \n" \
|
|
insn "\n" \
|
|
"2: l.swa %2, %1 \n" \
|
|
" l.bnf 1b \n" \
|
|
" l.ori %1, r0, 0 \n" \
|
|
"3: \n" \
|
|
".section .fixup,\"ax\" \n" \
|
|
"4: l.j 3b \n" \
|
|
" l.addi %1, r0, %3 \n" \
|
|
".previous \n" \
|
|
".section __ex_table,\"a\" \n" \
|
|
".word 1b,4b,2b,4b \n" \
|
|
".previous \n" \
|
|
: "=&r" (oldval), "=&r" (ret), "+m" (*uaddr) \
|
|
: "i" (-EFAULT), "r" (oparg) \
|
|
: "cc", "memory" \
|
|
); \
|
|
})
|
|
|
|
static inline int
|
|
arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
|
|
{
|
|
int oldval = 0, ret;
|
|
|
|
if (!access_ok(uaddr, sizeof(u32)))
|
|
return -EFAULT;
|
|
|
|
switch (op) {
|
|
case FUTEX_OP_SET:
|
|
__futex_atomic_op("l.or %1,%4,%4", ret, oldval, uaddr, oparg);
|
|
break;
|
|
case FUTEX_OP_ADD:
|
|
__futex_atomic_op("l.add %1,%0,%4", ret, oldval, uaddr, oparg);
|
|
break;
|
|
case FUTEX_OP_OR:
|
|
__futex_atomic_op("l.or %1,%0,%4", ret, oldval, uaddr, oparg);
|
|
break;
|
|
case FUTEX_OP_ANDN:
|
|
__futex_atomic_op("l.and %1,%0,%4", ret, oldval, uaddr, ~oparg);
|
|
break;
|
|
case FUTEX_OP_XOR:
|
|
__futex_atomic_op("l.xor %1,%0,%4", ret, oldval, uaddr, oparg);
|
|
break;
|
|
default:
|
|
ret = -ENOSYS;
|
|
}
|
|
|
|
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;
|
|
u32 prev;
|
|
|
|
if (!access_ok(uaddr, sizeof(u32)))
|
|
return -EFAULT;
|
|
|
|
__asm__ __volatile__ ( \
|
|
"1: l.lwa %1, %2 \n" \
|
|
" l.sfeq %1, %3 \n" \
|
|
" l.bnf 3f \n" \
|
|
" l.nop \n" \
|
|
"2: l.swa %2, %4 \n" \
|
|
" l.bnf 1b \n" \
|
|
" l.nop \n" \
|
|
"3: \n" \
|
|
".section .fixup,\"ax\" \n" \
|
|
"4: l.j 3b \n" \
|
|
" l.addi %0, r0, %5 \n" \
|
|
".previous \n" \
|
|
".section __ex_table,\"a\" \n" \
|
|
".word 1b,4b,2b,4b \n" \
|
|
".previous \n" \
|
|
: "+r" (ret), "=&r" (prev), "+m" (*uaddr) \
|
|
: "r" (oldval), "r" (newval), "i" (-EFAULT) \
|
|
: "cc", "memory" \
|
|
);
|
|
|
|
*uval = prev;
|
|
return ret;
|
|
}
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* __ASM_OPENRISC_FUTEX_H */
|