From b62928f9070c6f3c5cc43a4cb89b4bfb950d7406 Mon Sep 17 00:00:00 2001
From: Florian Weimer <fweimer@redhat.com>
Date: Thu, 25 Apr 2024 17:20:28 +0200
Subject: [PATCH] x86: In ld.so, diagnose missing APX support in APX-only
builds
At this point, this is mainly a tool for testing the early ld.so
CPU compatibility diagnostics: GCC uses the new instructions in most
functions, so it's easy to spot if some of the early code is not
built correctly.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
---
sysdeps/x86/dl-get-cpu-features.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/sysdeps/x86/dl-get-cpu-features.c b/sysdeps/x86/dl-get-cpu-features.c
index 4d6c5c59a6..579d02d638 100644
--- a/sysdeps/x86/dl-get-cpu-features.c
+++ b/sysdeps/x86/dl-get-cpu-features.c
@@ -64,6 +64,11 @@ Fatal glibc error: CPU does not support x86-64-v%d\n", 4);
# endif /* ISA level 4 */
# endif /* ISA level 3 */
# endif /* ISA level 2 */
+# ifdef GCCMACRO__APX_F__
+ if (!CPU_FEATURE_USABLE_P (cpu_features, APX_F))
+ _dl_fatal_printf ("\
+Fatal glibc error: CPU does not support APX\n");
+# endif
# endif /* IS_IN (rtld) */
}
}