diff options
Diffstat (limited to 'include/asm-sh/futex.h')
| -rw-r--r-- | include/asm-sh/futex.h | 79 |
1 files changed, 75 insertions, 4 deletions
diff --git a/include/asm-sh/futex.h b/include/asm-sh/futex.h index 6a332a9f099c..74ed3681d33c 100644 --- a/include/asm-sh/futex.h +++ b/include/asm-sh/futex.h @@ -1,6 +1,77 @@ -#ifndef _ASM_FUTEX_H -#define _ASM_FUTEX_H +#ifndef __ASM_SH_FUTEX_H +#define __ASM_SH_FUTEX_H -#include <asm-generic/futex.h> +#ifdef __KERNEL__ -#endif +#include <linux/futex.h> +#include <asm/errno.h> +#include <asm/uaccess.h> + +/* XXX: UP variants, fix for SH-4A and SMP.. */ +#include <asm/futex-irq.h> + +static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr) +{ + int op = (encoded_op >> 28) & 7; + int cmp = (encoded_op >> 24) & 15; + int oparg = (encoded_op << 8) >> 20; + int cmparg = (encoded_op << 20) >> 20; + int oldval = 0, ret; + + if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) + oparg = 1 << oparg; + + if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) + return -EFAULT; + + pagefault_disable(); + + switch (op) { + case FUTEX_OP_SET: + ret = atomic_futex_op_xchg_set(oparg, uaddr, &oldval); + break; + case FUTEX_OP_ADD: + ret = atomic_futex_op_xchg_add(oparg, uaddr, &oldval); + break; + case FUTEX_OP_OR: + ret = atomic_futex_op_xchg_or(oparg, uaddr, &oldval); + break; + case FUTEX_OP_ANDN: + ret = atomic_futex_op_xchg_and(~oparg, uaddr, &oldval); + break; + case FUTEX_OP_XOR: + ret = atomic_futex_op_xchg_xor(oparg, uaddr, &oldval); + break; + default: + ret = -ENOSYS; + break; + } + + pagefault_enable(); + + if (!ret) { + switch (cmp) { + case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; + case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; + case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; + case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; + case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; + case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; + default: ret = -ENOSYS; + } + } + + return ret; +} + +static inline int +futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval) +{ + if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) + return -EFAULT; + + return atomic_futex_op_cmpxchg_inatomic(uaddr, oldval, newval); +} + +#endif /* __KERNEL__ */ +#endif /* __ASM_SH_FUTEX_H */ |