Check the CVB's, CVBY's, and CVBG's corner cases.

Co-developed-by: Pavel Zbitskiy <pavel.zbitskiy@gmail.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Tested-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 tests/tcg/s390x/Makefile.target |   1 +
 tests/tcg/s390x/cvb.c           | 102 ++++++++++++++++++++++++++++++++
 2 files changed, 103 insertions(+)
 create mode 100644 tests/tcg/s390x/cvb.c

diff --git a/tests/tcg/s390x/Makefile.target b/tests/tcg/s390x/Makefile.target
index 04e4bddd83d..e2aba2ec274 100644
--- a/tests/tcg/s390x/Makefile.target
+++ b/tests/tcg/s390x/Makefile.target
@@ -46,6 +46,7 @@ TESTS+=laalg
 TESTS+=add-logical-with-carry
 TESTS+=lae
 TESTS+=cvd
+TESTS+=cvb
 
 cdsg: CFLAGS+=-pthread
 cdsg: LDFLAGS+=-pthread
diff --git a/tests/tcg/s390x/cvb.c b/tests/tcg/s390x/cvb.c
new file mode 100644
index 00000000000..e1735f6b81c
--- /dev/null
+++ b/tests/tcg/s390x/cvb.c
@@ -0,0 +1,102 @@
+/*
+ * Test the CONVERT TO BINARY instruction.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#include <assert.h>
+#include <signal.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+static int signum;
+
+static void signal_handler(int n)
+{
+    signum = n;
+}
+
+#define FAIL 0x1234567887654321
+#define OK32(x) (0x1234567800000000 | (uint32_t)(x))
+
+static int64_t cvb(uint64_t x)
+{
+    int64_t ret = FAIL;
+
+    signum = -1;
+    asm("cvb %[ret],%[x]" : [ret] "+r" (ret) : [x] "R" (x));
+
+    return ret;
+}
+
+static int64_t cvby(uint64_t x)
+{
+    int64_t ret = FAIL;
+
+    signum = -1;
+    asm("cvby %[ret],%[x]" : [ret] "+r" (ret) : [x] "T" (x));
+
+    return ret;
+}
+
+static int64_t cvbg(__uint128_t x)
+{
+    int64_t ret = FAIL;
+
+    signum = -1;
+    asm("cvbg %[ret],%[x]" : [ret] "+r" (ret) : [x] "T" (x));
+
+    return ret;
+}
+
+int main(void)
+{
+    __uint128_t m = (((__uint128_t)0x9223372036854775) << 16) | 0x8070;
+    struct sigaction act;
+    int err;
+
+    memset(&act, 0, sizeof(act));
+    act.sa_handler = signal_handler;
+    err = sigaction(SIGFPE, &act, NULL);
+    assert(err == 0);
+    err = sigaction(SIGILL, &act, NULL);
+    assert(err == 0);
+
+    assert(cvb(0xc) == OK32(0) && signum == -1);
+    assert(cvb(0x1c) == OK32(1) && signum == -1);
+    assert(cvb(0x25594c) == OK32(25594) && signum == -1);
+    assert(cvb(0x1d) == OK32(-1) && signum == -1);
+    assert(cvb(0x2147483647c) == OK32(0x7fffffff) && signum == -1);
+    assert(cvb(0x2147483648d) == OK32(-0x80000000) && signum == -1);
+    assert(cvb(0x7) == FAIL && signum == SIGILL);
+    assert(cvb(0x2147483648c) == OK32(0x80000000) && signum == SIGFPE);
+    assert(cvb(0x3000000000c) == OK32(0xb2d05e00) && signum == SIGFPE);
+    assert(cvb(0x2147483649d) == OK32(0x7fffffff) && signum == SIGFPE);
+    assert(cvb(0x3000000000d) == OK32(0x4d2fa200) && signum == SIGFPE);
+
+    assert(cvby(0xc) == OK32(0));
+    assert(cvby(0x1c) == OK32(1));
+    assert(cvby(0x25594c) == OK32(25594));
+    assert(cvby(0x1d) == OK32(-1));
+    assert(cvby(0x2147483647c) == OK32(0x7fffffff));
+    assert(cvby(0x2147483648d) == OK32(-0x80000000));
+    assert(cvby(0x7) == FAIL && signum == SIGILL);
+    assert(cvby(0x2147483648c) == OK32(0x80000000) && signum == SIGFPE);
+    assert(cvby(0x3000000000c) == OK32(0xb2d05e00) && signum == SIGFPE);
+    assert(cvby(0x2147483649d) == OK32(0x7fffffff) && signum == SIGFPE);
+    assert(cvby(0x3000000000d) == OK32(0x4d2fa200) && signum == SIGFPE);
+
+    assert(cvbg(0xc) == 0);
+    assert(cvbg(0x1c) == 1);
+    assert(cvbg(0x25594c) == 25594);
+    assert(cvbg(0x1d) == -1);
+    assert(cvbg(m + 0xc) == 0x7fffffffffffffff);
+    assert(cvbg(m + 0x1d) == -0x8000000000000000);
+    assert(cvbg(0x7) == FAIL && signum == SIGILL);
+    assert(cvbg(m + 0x1c) == FAIL && signum == SIGFPE);
+    assert(cvbg(m + 0x2d) == FAIL && signum == SIGFPE);
+    assert(cvbg(((__uint128_t)1 << 80) + 0xc) == FAIL && signum == SIGFPE);
+    assert(cvbg(((__uint128_t)1 << 80) + 0xd) == FAIL && signum == SIGFPE);
+
+    return EXIT_SUCCESS;
+}
-- 
2.43.0