Index: src/ext/x86/x86inc.asm
--- src/ext/x86/x86inc.asm.orig
+++ src/ext/x86/x86inc.asm
@@ -226,6 +226,12 @@ DECLARE_REG_TMP_SIZE 0,1,2,3,4,5,6,7,8,9,10,11,12,13,1
     %define gprsize 4
 %endif
 
+%if ARCH_X86_64
+    %define _CET_ENDBR	endbr64
+%else
+    %define _CET_ENDBR
+%endif
+
 %macro LEA 2
 %if ARCH_X86_64
     lea %1, [%2]
@@ -795,6 +801,7 @@ BRANCH_INSTR jz, je, jnz, jne, jl, jle, jnl, jnle, jg,
     %endif
     align function_align
     %2:
+    _CET_ENDBR
     RESET_MM_PERMUTATION        ; needed for x86-64, also makes disassembly somewhat nicer
     %xdefine rstk rsp           ; copy of the original stack pointer, used when greater alignment than the known stack alignment is required
     %assign stack_offset 0      ; stack pointer offset relative to the return address
@@ -816,6 +823,7 @@ BRANCH_INSTR jz, je, jnz, jne, jl, jle, jnl, jnle, jg,
         global current_function %+ %1
     %endif
     %1:
+    _CET_ENDBR
 %endmacro
 
 %macro cextern 1