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| /* SPDX-License-Identifier: GPL-2.0 */
| #ifndef _ASM_MICROBLAZE_FUTEX_H
| #define _ASM_MICROBLAZE_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: lwx %0, %2, r0; " \
| insn \
| "2: swx %1, %2, r0; \
| addic %1, r0, 0; \
| bnei %1, 1b; \
| 3: \
| .section .fixup,\"ax\"; \
| 4: brid 3b; \
| addik %1, r0, %3; \
| .previous; \
| .section __ex_table,\"a\"; \
| .word 1b,4b,2b,4b; \
| .previous;" \
| : "=&r" (oldval), "=&r" (ret) \
| : "r" (uaddr), "i" (-EFAULT), "r" (oparg) \
| ); \
| })
|
| 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("or %1,%4,%4;", ret, oldval, uaddr, oparg);
| break;
| case FUTEX_OP_ADD:
| __futex_atomic_op("add %1,%0,%4;", ret, oldval, uaddr, oparg);
| break;
| case FUTEX_OP_OR:
| __futex_atomic_op("or %1,%0,%4;", ret, oldval, uaddr, oparg);
| break;
| case FUTEX_OP_ANDN:
| __futex_atomic_op("andn %1,%0,%4;", ret, oldval, uaddr, oparg);
| break;
| case FUTEX_OP_XOR:
| __futex_atomic_op("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, cmp;
| u32 prev;
|
| if (!access_ok(uaddr, sizeof(u32)))
| return -EFAULT;
|
| __asm__ __volatile__ ("1: lwx %1, %3, r0; \
| cmp %2, %1, %4; \
| bnei %2, 3f; \
| 2: swx %5, %3, r0; \
| addic %2, r0, 0; \
| bnei %2, 1b; \
| 3: \
| .section .fixup,\"ax\"; \
| 4: brid 3b; \
| addik %0, r0, %6; \
| .previous; \
| .section __ex_table,\"a\"; \
| .word 1b,4b,2b,4b; \
| .previous;" \
| : "+r" (ret), "=&r" (prev), "=&r"(cmp) \
| : "r" (uaddr), "r" (oldval), "r" (newval), "i" (-EFAULT));
|
| *uval = prev;
| return ret;
| }
|
| #endif /* __KERNEL__ */
|
| #endif
|
|
