[PATCH 2/2] tests/tcg/s390x: Add early-exception-recognition.S

[Ilya Leoshkevich]

Add a small test that checks whether early exceptions are recognized
and whether the correct ILC and old PSW are stored when they happen.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 tests/tcg/s390x/Makefile.softmmu-target       |  1 +
 tests/tcg/s390x/early-exception-recognition.S | 38 +++++++++++++++++++
 2 files changed, 39 insertions(+)
 create mode 100644 tests/tcg/s390x/early-exception-recognition.S

diff --git a/tests/tcg/s390x/Makefile.softmmu-target 
b/tests/tcg/s390x/Makefile.softmmu-target
index 725b6c598db..9d3180bbcba 100644
--- a/tests/tcg/s390x/Makefile.softmmu-target
+++ b/tests/tcg/s390x/Makefile.softmmu-target
@@ -9,3 +9,4 @@ QEMU_OPTS=-action panic=exit-failure -kernel
 TESTS += unaligned-lowcore
 TESTS += bal
 TESTS += sam
+TESTS += early-exception-recognition
diff --git a/tests/tcg/s390x/early-exception-recognition.S 
b/tests/tcg/s390x/early-exception-recognition.S
new file mode 100644
index 00000000000..4e9677fea36
--- /dev/null
+++ b/tests/tcg/s390x/early-exception-recognition.S
@@ -0,0 +1,38 @@
+/*
+ * Test early exception recognition.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+    .org 0x8d
+ilc:
+    .org 0x8e
+program_interruption_code:
+    .org 0x150
+program_old_psw:
+    .org 0x1D0                         /* program new PSW */
+    .quad 0,pgm
+    .org 0x200                         /* lowcore padding */
+
+    .globl _start
+_start:
+    lpswe bad_psw
+    j failure
+
+pgm:
+    chhsi program_interruption_code,0x6          /* specification exception? */
+    jne failure
+    cli ilc,0                                    /* ilc zero? */
+    jne failure
+    clc program_old_psw(16),bad_psw              /* correct old PSW? */
+    jne failure
+    lpswe success_psw
+failure:
+    lpswe failure_psw
+
+    .align 8
+bad_psw:
+    .quad 0x8000000000000000,0xfedcba9876543210  /* bit 0 set */
+success_psw:
+    .quad 0x2000000000000,0xfff        /* see is_special_wait_psw() */
+failure_psw:
+    .quad 0x2000000000000,0            /* disabled wait */
-- 
2.39.2