D46417.id142370.diff
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	diff --git a/lib/libc/aarch64/string/Makefile.inc b/lib/libc/aarch64/string/Makefile.inc
	--- a/lib/libc/aarch64/string/Makefile.inc
	+++ b/lib/libc/aarch64/string/Makefile.inc
	@@ -20,6 +20,8 @@
	strnlen \
	strrchr

	+MDSRCS+= strcat.S
	+
	#
	# Add the above functions. Generate an asm file that includes the needed
	# Arm Optimized Routines file defining the function name to the libc name.
	diff --git a/lib/libc/aarch64/string/strcat.S b/lib/libc/aarch64/string/strcat.S
	new file mode 100644
	--- /dev/null
	+++ b/lib/libc/aarch64/string/strcat.S
	@@ -0,0 +1,29 @@
	+/*-
	+ * SPDX-License-Identifier: BSD-2-Clause
	+ *
	+ * Copyright (c) 2024 Getz Mikalsen <getz@FreeBSD.org>
	+*/
	+
	+#include <machine/asm.h>
	+
	+ .weak strcat
	+ .set strcat, __strcat
	+ .text
	+
	+ENTRY(__strcat)
	+ stp x29, x30, [sp, #-16]!
	+ str x19, [sp, #-16]! // store preserved registers
	+
	+ mov x19, x0 // stash dest for later
	+ bl strlen // strlen(dest)
	+
	+ add x0, x19, x0 // dest + (strlen(dest))
	+ bl stpcpy // stpcpy(dest + strlen(dest), src)
	+
	+ mov x0, x19 // return dest
	+
	+ ldr x19, [sp], #16 // load preserved registers
	+ ldp x29, x30, [sp], #16
	+ ret
	+
	+END(__strcat)