tests/tcg/s390x: Test SIGILL and SIGSEGV handling

Verify that s390x-specific uc_mcontext.psw.addr is reported correctly
and that signal handling interacts properly with debugging.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Acked-by: Alex Bennée <alex.bennee@linaro.org>
Acked-by: David Hildenbrand <david@redhat.com>
Message-Id: <20210804225146.154513-1-iii@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

tests/tcg/s390x/gdbstub/test-signals-s390x.py

@@ -0,0 +1,76 @@
+from __future__ import print_function
+
+#
+# Test that signals and debugging mix well together on s390x.
+#
+# This is launched via tests/guest-debug/run-test.py
+#
+
+import gdb
+import sys
+
+failcount = 0
+
+
+def report(cond, msg):
+    """Report success/fail of test"""
+    if cond:
+        print("PASS: %s" % (msg))
+    else:
+        print("FAIL: %s" % (msg))
+        global failcount
+        failcount += 1
+
+
+def run_test():
+    """Run through the tests one by one"""
+    illegal_op = gdb.Breakpoint("illegal_op")
+    stg = gdb.Breakpoint("stg")
+    mvc_8 = gdb.Breakpoint("mvc_8")
+
+    # Expect the following events:
+    # 1x illegal_op breakpoint
+    # 2x stg breakpoint, segv, breakpoint
+    # 2x mvc_8 breakpoint, segv, breakpoint
+    for _ in range(14):
+        gdb.execute("c")
+    report(illegal_op.hit_count == 1, "illegal_op.hit_count == 1")
+    report(stg.hit_count == 4, "stg.hit_count == 4")
+    report(mvc_8.hit_count == 4, "mvc_8.hit_count == 4")
+
+    # The test must succeed.
+    gdb.Breakpoint("_exit")
+    gdb.execute("c")
+    status = int(gdb.parse_and_eval("$r2"))
+    report(status == 0, "status == 0");
+
+
+#
+# This runs as the script it sourced (via -x, via run-test.py)
+#
+try:
+    inferior = gdb.selected_inferior()
+    arch = inferior.architecture()
+    print("ATTACHED: %s" % arch.name())
+except (gdb.error, AttributeError):
+    print("SKIPPING (not connected)", file=sys.stderr)
+    exit(0)
+
+if gdb.parse_and_eval("$pc") == 0:
+    print("SKIP: PC not set")
+    exit(0)
+
+try:
+    # These are not very useful in scripts
+    gdb.execute("set pagination off")
+    gdb.execute("set confirm off")
+
+    # Run the actual tests
+    run_test()
+except (gdb.error):
+    print("GDB Exception: %s" % (sys.exc_info()[0]))
+    failcount += 1
+    pass
+
+print("All tests complete: %d failures" % failcount)
+exit(failcount)