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Diffstat (limited to '')
| -rw-r--r-- | arch/sh/include/asm/futex.h | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/arch/sh/include/asm/futex.h b/arch/sh/include/asm/futex.h new file mode 100644 index 000000000..b70f3fce6 --- /dev/null +++ b/arch/sh/include/asm/futex.h @@ -0,0 +1,72 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_SH_FUTEX_H +#define __ASM_SH_FUTEX_H + +#include <linux/futex.h> +#include <linux/uaccess.h> +#include <asm/errno.h> + +#if !defined(CONFIG_SMP) +#include <asm/futex-irq.h> +#elif defined(CONFIG_CPU_J2) +#include <asm/futex-cas.h> +#elif defined(CONFIG_CPU_SH4A) +#include <asm/futex-llsc.h> +#else +#error SMP not supported on this configuration. +#endif + +static inline int +futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, + u32 oldval, u32 newval) +{ + if (!access_ok(uaddr, sizeof(u32))) + return -EFAULT; + + return atomic_futex_op_cmpxchg_inatomic(uval, uaddr, oldval, newval); +} + +static inline int arch_futex_atomic_op_inuser(int op, u32 oparg, int *oval, + u32 __user *uaddr) +{ + u32 oldval, newval, prev; + int ret; + + do { + ret = get_user(oldval, uaddr); + + if (ret) break; + + switch (op) { + case FUTEX_OP_SET: + newval = oparg; + break; + case FUTEX_OP_ADD: + newval = oldval + oparg; + break; + case FUTEX_OP_OR: + newval = oldval | oparg; + break; + case FUTEX_OP_ANDN: + newval = oldval & ~oparg; + break; + case FUTEX_OP_XOR: + newval = oldval ^ oparg; + break; + default: + ret = -ENOSYS; + break; + } + + if (ret) break; + + ret = futex_atomic_cmpxchg_inatomic(&prev, uaddr, oldval, newval); + } while (!ret && prev != oldval); + + if (!ret) + *oval = oldval; + + return ret; +} + +#endif /* __ASM_SH_FUTEX_H */ |