tests/tcg/s390x: Test ICM

Add a small test to prevent regressions.

Tested-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-Id: <20230724082032.66864-12-iii@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

tests/tcg/s390x/Makefile.softmmu-target

@@ -19,6 +19,7 @@ ASM_TESTS =                                                                    \
     cksm                                                                       \
     clm                                                                        \
     exrl-ssm-early                                                             \
+    icm                                                                        \
     sam                                                                        \
     lpsw                                                                       \
     lpswe-early                                                                \

tests/tcg/s390x/icm.S

@@ -0,0 +1,32 @@
+    .org 0x8e
+program_interruption_code:
+    .org 0x1d0                         /* program new PSW */
+    .quad 0,pgm
+    .org 0x200                         /* lowcore padding */
+    .globl _start
+_start:
+    lgrl %r0,op1
+    icm %r0,10,op2
+    cg %r0,exp
+    jne failure
+    lgrl %r1,bad_addr
+    icm %r0,0,0(%r1)
+failure:
+    lpswe failure_psw
+pgm:
+    chhsi program_interruption_code,5  /* addressing exception? */
+    jne failure
+    lpswe success_psw
+    .align 8
+op1:
+    .quad 0x1234567887654321
+op2:
+    .quad 0x0011223344556677
+exp:
+    .quad 0x1234567800651121
+bad_addr:
+    .quad 0xffffffff00000000
+success_psw:
+    .quad 0x2000000000000,0xfff        /* see is_special_wait_psw() */
+failure_psw:
+    .quad 0x2000000000000,0            /* disabled wait */