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72 lines
1.3 KiB
72 lines
1.3 KiB
/* 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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#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(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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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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if (!ret) |
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*oval = oldval; |
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return ret; |
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} |
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#endif /* __ASM_SH_FUTEX_H */
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