Index: mpn/arm64/arm64-defs.m4
--- mpn/arm64/arm64-defs.m4.orig
+++ mpn/arm64/arm64-defs.m4
@@ -37,6 +37,17 @@ dnl  don't want to disable macro expansions in or afte
 changecom
 
 
+dnl  Called: PROLOGUE_cpu(GSYM_PREFIX`'foo)
+
+define(`PROLOGUE_cpu',
+m4_assert_numargs(1)
+`	TEXT
+	ALIGN(8)
+	GLOBL	`$1' GLOBL_ATTR
+	TYPE(`$1',`function')
+`$1'LABEL_SUFFIX
+	bti	c')
+
 dnl  LEA_HI(reg,gmp_symbol), LEA_LO(reg,gmp_symbol)
 dnl
 dnl  Load the address of gmp_symbol into a register. We split this into two