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| /* SPDX-License-Identifier: GPL-2.0 */
| // Copyright (C) 2005-2017 Andes Technology Corporation
|
| #ifndef __NDS32_FUTEX_H__
| #define __NDS32_FUTEX_H__
|
| #include <linux/futex.h>
| #include <linux/uaccess.h>
| #include <asm/errno.h>
|
| #define __futex_atomic_ex_table(err_reg) \
| " .pushsection __ex_table,\"a\"\n" \
| " .align 3\n" \
| " .long 1b, 4f\n" \
| " .long 2b, 4f\n" \
| " .popsection\n" \
| " .pushsection .fixup,\"ax\"\n" \
| "4: move %0, " err_reg "\n" \
| " b 3b\n" \
| " .popsection"
|
| #define __futex_atomic_op(insn, ret, oldval, tmp, uaddr, oparg) \
| smp_mb(); \
| asm volatile( \
| " movi $ta, #0\n" \
| "1: llw %1, [%2+$ta]\n" \
| " " insn "\n" \
| "2: scw %0, [%2+$ta]\n" \
| " beqz %0, 1b\n" \
| " movi %0, #0\n" \
| "3:\n" \
| __futex_atomic_ex_table("%4") \
| : "=&r" (ret), "=&r" (oldval) \
| : "r" (uaddr), "r" (oparg), "i" (-EFAULT) \
| : "cc", "memory")
| static inline int
| futex_atomic_cmpxchg_inatomic(u32 * uval, u32 __user * uaddr,
| u32 oldval, u32 newval)
| {
| int ret = 0;
| u32 val, tmp, flags;
|
| if (!access_ok(uaddr, sizeof(u32)))
| return -EFAULT;
|
| smp_mb();
| asm volatile (" movi $ta, #0\n"
| "1: llw %1, [%6 + $ta]\n"
| " sub %3, %1, %4\n"
| " cmovz %2, %5, %3\n"
| " cmovn %2, %1, %3\n"
| "2: scw %2, [%6 + $ta]\n"
| " beqz %2, 1b\n"
| "3:\n " __futex_atomic_ex_table("%7")
| :"+&r"(ret), "=&r"(val), "=&r"(tmp), "=&r"(flags)
| :"r"(oldval), "r"(newval), "r"(uaddr), "i"(-EFAULT)
| :"$ta", "memory");
| smp_mb();
|
| *uval = val;
| return ret;
| }
|
| 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("move %0, %3", ret, oldval, tmp, uaddr,
| oparg);
| break;
| case FUTEX_OP_ADD:
| __futex_atomic_op("add %0, %1, %3", ret, oldval, tmp, uaddr,
| oparg);
| break;
| case FUTEX_OP_OR:
| __futex_atomic_op("or %0, %1, %3", ret, oldval, tmp, uaddr,
| oparg);
| break;
| case FUTEX_OP_ANDN:
| __futex_atomic_op("and %0, %1, %3", ret, oldval, tmp, uaddr,
| ~oparg);
| break;
| case FUTEX_OP_XOR:
| __futex_atomic_op("xor %0, %1, %3", ret, oldval, tmp, uaddr,
| oparg);
| break;
| default:
| ret = -ENOSYS;
| }
|
| if (!ret)
| *oval = oldval;
|
| return ret;
| }
| #endif /* __NDS32_FUTEX_H__ */
|
|
