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