1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
8 #include <linux/futex.h>
9 #include <linux/uaccess.h>
10 #include <asm/asm-extable.h>
11 #include <asm/barrier.h>
12 #include <asm/errno.h>
14 #define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
16 __asm__ __volatile__( \
17 "1: ll.w %1, %4 # __futex_atomic_op\n" \
19 "2: sc.w $t0, %2 \n" \
22 _ASM_EXTABLE_UACCESS_ERR(1b, 3b, %0) \
23 _ASM_EXTABLE_UACCESS_ERR(2b, 3b, %0) \
24 : "=r" (ret), "=&r" (oldval), \
26 : "0" (0), "ZC" (*uaddr), "Jr" (oparg) \
31 arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
33 int oldval = 0, ret = 0;
39 __futex_atomic_op("move $t0, %z5", ret, oldval, uaddr, oparg);
42 __futex_atomic_op("add.w $t0, %1, %z5", ret, oldval, uaddr, oparg);
45 __futex_atomic_op("or $t0, %1, %z5", ret, oldval, uaddr, oparg);
48 __futex_atomic_op("and $t0, %1, %z5", ret, oldval, uaddr, ~oparg);
51 __futex_atomic_op("xor $t0, %1, %z5", ret, oldval, uaddr, oparg);
66 futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, u32 oldval, u32 newval)
71 if (!access_ok(uaddr, sizeof(u32)))
75 "# futex_atomic_cmpxchg_inatomic \n"
83 _ASM_EXTABLE_UACCESS_ERR(1b, 3b, %0)
84 _ASM_EXTABLE_UACCESS_ERR(2b, 3b, %0)
85 : "+r" (ret), "=&r" (val), "=ZC" (*uaddr)
86 : "ZC" (*uaddr), "Jr" (oldval), "Jr" (newval)
94 #endif /* _ASM_FUTEX_H */