Skip btcfi tests on amd64 CPUs not supporting CET IBT.

ok kettenis@

diff --git a/regress/sys/btcfi/foobar.c b/regress/sys/btcfi/foobar.c
index e521979..8ed60c1 100644 (file)
--- a/regress/sys/btcfi/foobar.c
+++ b/regress/sys/btcfi/foobar.c
@@ -1,6 +1,8 @@
 /* Public domain */
 
 #include <signal.h>
+#include <stdint.h>
+#include <stdio.h>
 #include <stdlib.h>
 
 extern void foo(void);
@@ -19,11 +21,30 @@ handler(int sig, siginfo_t *si, void *context)
                exit(0);
 }
 
+#if defined(__amd64__)
+static int
+has_cet_ibt(void)
+{
+       uint32_t d;
+
+       asm("cpuid" : "=d" (d) : "a" (7), "c" (0));
+       return (d & (1U << 20)) ? 1 : 0;
+}
+#endif
+
 int
 main(void)
 {
        struct sigaction sa;
 
+#if defined(__amd64__)
+       if (!has_cet_ibt()) {
+               printf("Unsupported CPU\n");
+               printf("SKIPPED\n");
+               exit(0);
+       }
+#endif
+
        sa.sa_sigaction = handler;
        sa.sa_mask = 0;
        sa.sa_flags = SA_SIGINFO;