Index: cipher/asm-common-aarch64.h
--- cipher/asm-common-aarch64.h.orig
+++ cipher/asm-common-aarch64.h
@@ -45,7 +45,7 @@
 
 #ifdef HAVE_GCC_ASM_CFI_DIRECTIVES
 /* CFI directives to emit DWARF stack unwinding information. */
-# define CFI_STARTPROC()            .cfi_startproc
+# define CFI_STARTPROC()            .cfi_startproc; bti c
 # define CFI_ENDPROC()              .cfi_endproc
 # define CFI_REMEMBER_STATE()       .cfi_remember_state
 # define CFI_RESTORE_STATE()        .cfi_restore_state
@@ -87,7 +87,7 @@
 	    DW_SLEB128_28BIT(rsp_offs)
 
 #else
-# define CFI_STARTPROC()
+# define CFI_STARTPROC() bti c
 # define CFI_ENDPROC()
 # define CFI_REMEMBER_STATE()
 # define CFI_RESTORE_STATE()