v4.19.13 snapshot.
diff --git a/arch/powerpc/lib/string.S b/arch/powerpc/lib/string.S
new file mode 100644
index 0000000..4b41970
--- /dev/null
+++ b/arch/powerpc/lib/string.S
@@ -0,0 +1,69 @@
+/*
+ * String handling functions for PowerPC.
+ *
+ * Copyright (C) 1996 Paul Mackerras.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include <asm/ppc_asm.h>
+#include <asm/export.h>
+#include <asm/cache.h>
+
+ .text
+
+/* This clears out any unused part of the destination buffer,
+ just as the libc version does. -- paulus */
+_GLOBAL(strncpy)
+ PPC_LCMPI 0,r5,0
+ beqlr
+ mtctr r5
+ addi r6,r3,-1
+ addi r4,r4,-1
+ .balign IFETCH_ALIGN_BYTES
+1: lbzu r0,1(r4)
+ cmpwi 0,r0,0
+ stbu r0,1(r6)
+ bdnzf 2,1b /* dec ctr, branch if ctr != 0 && !cr0.eq */
+ bnelr /* if we didn't hit a null char, we're done */
+ mfctr r5
+ PPC_LCMPI 0,r5,0 /* any space left in destination buffer? */
+ beqlr /* we know r0 == 0 here */
+2: stbu r0,1(r6) /* clear it out if so */
+ bdnz 2b
+ blr
+EXPORT_SYMBOL(strncpy)
+
+_GLOBAL(strncmp)
+ PPC_LCMPI 0,r5,0
+ beq- 2f
+ mtctr r5
+ addi r5,r3,-1
+ addi r4,r4,-1
+ .balign IFETCH_ALIGN_BYTES
+1: lbzu r3,1(r5)
+ cmpwi 1,r3,0
+ lbzu r0,1(r4)
+ subf. r3,r0,r3
+ beqlr 1
+ bdnzt eq,1b
+ blr
+2: li r3,0
+ blr
+EXPORT_SYMBOL(strncmp)
+
+_GLOBAL(memchr)
+ PPC_LCMPI 0,r5,0
+ beq- 2f
+ mtctr r5
+ addi r3,r3,-1
+ .balign IFETCH_ALIGN_BYTES
+1: lbzu r0,1(r3)
+ cmpw 0,r0,r4
+ bdnzf 2,1b
+ beqlr
+2: li r3,0
+ blr
+EXPORT_SYMBOL(memchr)