https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85388
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
I am testing this patch:
diff --git a/gcc/config/i386/cet.h b/gcc/config/i386/cet.h
index 9dca41bad2d..309d90ec87c 100644
--- a/gcc/config/i386/cet.h
+++ b/gcc/config/i386/cet.h
@@ -33,12 +33,14 @@
#ifdef __ASSEMBLER__
# ifdef __IBT__
+# define _CET_NOTRACK notrack
# ifdef __x86_64__
# define _CET_ENDBR endbr64
# else
# define _CET_ENDBR endbr32
# endif
# else
+# define _CET_NOTRACK
# define _CET_ENDBR
# endif
diff --git a/libgcc/config/i386/morestack.S b/libgcc/config/i386/morestack.S
index 99e65eaaff4..c0cda479806 100644
--- a/libgcc/config/i386/morestack.S
+++ b/libgcc/config/i386/morestack.S
@@ -543,7 +543,7 @@ __morestack:
movq -16(%rbp),%rax # Restore caller's %rax.
- call *%r10 # Call our caller!
+ _CET_NOTRACK call *%r10 # Call our caller!
# The caller will return here, as predicted.
