1 files changed, 21 insertions, 0 deletions
diff --git a/arch/powerpc/mm/maccess.c b/arch/powerpc/mm/maccess.c
index fa9a7a718fc6..a3c30a884076 100644
--- a/arch/powerpc/mm/maccess.c
+++ b/arch/powerpc/mm/maccess.c
@@ -3,7 +3,28 @@
 #include <linux/uaccess.h>
 #include <linux/kernel.h>
 
+#include <asm/disassemble.h>
+#include <asm/inst.h>
+#include <asm/ppc-opcode.h>
+
 bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size)
 {
 	return is_kernel_addr((unsigned long)unsafe_src);
 }
+
+int copy_inst_from_kernel_nofault(struct ppc_inst *inst, struct ppc_inst *src)
+{
+	unsigned int val, suffix;
+	int err;
+
+	err = copy_from_kernel_nofault(&val, src, sizeof(val));
+	if (err)
+		return err;
+	if (IS_ENABLED(CONFIG_PPC64) && get_op(val) == OP_PREFIX) {
+		err = copy_from_kernel_nofault(&suffix, (void *)src + 4, 4);
+		*inst = ppc_inst_prefix(val, suffix);
+	} else {
+		*inst = ppc_inst(val);
+	}
+	return err;
+}