tests/tcg/s390x: Test LARL with a large offset

Add a small test to prevent regressions. Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Acked-by: David Hildenbrand <david@redhat.com> Message-Id: <20230704081506.276055-10-iii@linux.ibm.com> Signed-off-by: Thomas Huth <thuth@redhat.com>
qemu · Jul 10, 2023 · ad85ac6 · ad85ac6
1 parent f5c2ae7
commit ad85ac6
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diff --git a/tests/tcg/s390x/Makefile.target b/tests/tcg/s390x/Makefile.target
@@ -37,6 +37,7 @@ TESTS+=ex-relative-long
 TESTS+=ex-branch
 TESTS+=mxdb
 TESTS+=epsw
+TESTS+=larl
 
 cdsg: CFLAGS+=-pthread
 cdsg: LDFLAGS+=-pthread

diff --git a/tests/tcg/s390x/larl.c b/tests/tcg/s390x/larl.c
@@ -0,0 +1,21 @@
+/*
+ * Test the LARL instruction.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#include <stdlib.h>
+
+int main(void)
+{
+    long algfi = (long)main;
+    long larl;
+
+    /*
+     * The compiler may emit larl for the C addition, so compute the expected
+     * value using algfi.
+     */
+    asm("algfi %[r],0xd0000000" : [r] "+r" (algfi) : : "cc");
+    asm("larl %[r],main+0xd0000000" : [r] "=r" (larl));
+
+    return algfi == larl ? EXIT_SUCCESS : EXIT_FAILURE;
+}