LoongArch: Add exception/interrupt handling

Add the exception and interrupt handling machanism for basic LoongArch
support.

Reviewed-by: WANG Xuerui <git@xen0n.name>
Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

1 files changed, 13 insertions, 0 deletions

diff --git a/arch/loongarch/kernel/access-helper.h b/arch/loongarch/kernel/access-helper.h
new file mode 100644
index 000000000000..4a35ca81bd08
--- /dev/null
+++ b/arch/loongarch/kernel/access-helper.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#include <linux/uaccess.h>
+
+static inline int __get_inst(u32 *i, u32 *p, bool user)
+{
+	return user ? get_user(*i, (u32 __user *)p) : get_kernel_nofault(*i, p);
+}
+
+static inline int __get_addr(unsigned long *a, unsigned long *p, bool user)
+{
+	return user ? get_user(*a, (unsigned long __user *)p) : get_kernel_nofault(*a, p);
+}