[PATCH v2 2/2] tests/tcg/s390x: Add rxsbg.c

[Ilya Leoshkevich <iii@linux.ibm.com>]

Add a small test for RXSBG with T=1 to prevent regressions.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 tests/tcg/s390x/Makefile.target |  3 +++
 tests/tcg/s390x/rxsbg.c         | 46 +++++++++++++++++++++++++++++++++
 2 files changed, 49 insertions(+)
 create mode 100644 tests/tcg/s390x/rxsbg.c

diff --git a/tests/tcg/s390x/Makefile.target b/tests/tcg/s390x/Makefile.target
index cf93b966862..3c940ac952e 100644
--- a/tests/tcg/s390x/Makefile.target
+++ b/tests/tcg/s390x/Makefile.target
@@ -29,10 +29,13 @@ TESTS+=clst
 TESTS+=long-double
 TESTS+=cdsg
 TESTS+=chrl
+TESTS+=rxsbg
 
 cdsg: CFLAGS+=-pthread
 cdsg: LDFLAGS+=-pthread
 
+rxsbg: CFLAGS+=-O2
+
 Z13_TESTS=vistr
 $(Z13_TESTS): CFLAGS+=-march=z13 -O2
 TESTS+=$(Z13_TESTS)
diff --git a/tests/tcg/s390x/rxsbg.c b/tests/tcg/s390x/rxsbg.c
new file mode 100644
index 00000000000..4b155db304e
--- /dev/null
+++ b/tests/tcg/s390x/rxsbg.c
@@ -0,0 +1,46 @@
+/*
+ * Test the RXSBG instruction.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#include <assert.h>
+#include <stdlib.h>
+
+static inline __attribute__((__always_inline__)) void
+rxsbg(unsigned long *r1, unsigned long r2, int i3, int i4, int i5, int *cc)
+{
+    asm("rxsbg %[r1],%[r2],%[i3],%[i4],%[i5]\n"
+        "ipm %[cc]"
+        : [r1] "+r" (*r1), [cc] "=r" (*cc)
+        : [r2] "r" (r2) , [i3] "i" (i3) , [i4] "i" (i4) , [i5] "i" (i5)
+        : "cc");
+    *cc = (*cc >> 28) & 3;
+}
+
+void test_cc0(void)
+{
+    unsigned long r1 = 6;
+    int cc;
+
+    rxsbg(&r1, 3, 61 | 0x80, 62, 1, &cc);
+    assert(r1 == 6);
+    assert(cc == 0);
+}
+
+void test_cc1(void)
+{
+    unsigned long r1 = 2;
+    int cc;
+
+    rxsbg(&r1, 3, 61 | 0x80, 62, 1, &cc);
+    assert(r1 == 2);
+    assert(cc == 1);
+}
+
+int main(void)
+{
+    test_cc0();
+    test_cc1();
+
+    return EXIT_SUCCESS;
+}
-- 
2.39.2