80 lines
1.4 KiB
C
80 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_SH_FUTEX_H
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#define __ASM_SH_FUTEX_H
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#ifdef __KERNEL__
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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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#if !defined(CONFIG_SMP)
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#include <asm/futex-irq.h>
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#elif defined(CONFIG_CPU_J2)
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#include <asm/futex-cas.h>
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#elif defined(CONFIG_CPU_SH4A)
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#include <asm/futex-llsc.h>
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#else
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#error SMP not supported on this configuration.
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#endif
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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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if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
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return -EFAULT;
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return atomic_futex_op_cmpxchg_inatomic(uval, uaddr, oldval, newval);
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}
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static inline int arch_futex_atomic_op_inuser(int op, u32 oparg, int *oval,
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u32 __user *uaddr)
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{
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u32 oldval, newval, prev;
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int ret;
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pagefault_disable();
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do {
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ret = get_user(oldval, uaddr);
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if (ret) break;
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switch (op) {
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case FUTEX_OP_SET:
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newval = oparg;
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break;
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case FUTEX_OP_ADD:
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newval = oldval + oparg;
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break;
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case FUTEX_OP_OR:
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newval = oldval | oparg;
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break;
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case FUTEX_OP_ANDN:
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newval = oldval & ~oparg;
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break;
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case FUTEX_OP_XOR:
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newval = oldval ^ oparg;
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break;
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default:
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ret = -ENOSYS;
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break;
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}
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if (ret) break;
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ret = futex_atomic_cmpxchg_inatomic(&prev, uaddr, oldval, newval);
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} while (!ret && prev != oldval);
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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 /* __KERNEL__ */
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#endif /* __ASM_SH_FUTEX_H */
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