1 files changed, 77 insertions, 0 deletions

diff --git a/arch/sh/include/asm/futex.h b/arch/sh/include/asm/futex.h
new file mode 100644
index 000000000000..68256ec5fa35
--- /dev/null
+++ b/arch/sh/include/asm/futex.h
@@ -0,0 +1,77 @@
+#ifndef __ASM_SH_FUTEX_H
+#define __ASM_SH_FUTEX_H
+
+#ifdef __KERNEL__
+
+#include <linux/futex.h>
+#include <linux/uaccess.h>
+#include <asm/errno.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 */