tests/tcg/s390x: Test TEST AND SET

Add a small test to prevent regressions.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20240318202722.20675-2-iii@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

tests/tcg/s390x/Makefile.target

@@ -47,6 +47,7 @@ TESTS+=add-logical-with-carry
 TESTS+=lae
 TESTS+=cvd
 TESTS+=cvb
+TESTS+=ts
 
 cdsg: CFLAGS+=-pthread
 cdsg: LDFLAGS+=-pthread

tests/tcg/s390x/ts.c

@@ -0,0 +1,35 @@
+/*
+ * Test the TEST AND SET instruction.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#include <assert.h>
+#include <stdlib.h>
+
+static int ts(char *p)
+{
+    int cc;
+
+    asm("ts %[p]\n"
+        "ipm %[cc]"
+        : [cc] "=r" (cc)
+        , [p] "+Q" (*p)
+        : : "cc");
+
+    return (cc >> 28) & 3;
+}
+
+int main(void)
+{
+    char c;
+
+    c = 0x80;
+    assert(ts(&c) == 1);
+    assert(c == 0xff);
+
+    c = 0x7f;
+    assert(ts(&c) == 0);
+    assert(c == 0xff);
+
+    return EXIT_SUCCESS;
+}