new file mode 100644
@@ -0,0 +1,48 @@
+###############################################################################
+# Copyright 2023 Red Hat Inc.
+# All rights reserved. This program and the accompanying materials
+# are made available under the terms of the Eclipse Public License v1.0
+# which accompanies this distribution, and is available at
+# http://www.eclipse.org/legal/epl-v10.html
+#
+# Contributors:
+# Thomas Huth - initial implementation
+###############################################################################
+
+.mode s390x
+
+# format:RR Add (register + register, 32 bit)
+AR Z 00011010 r1:4 r2:4
+
+# format:RRE Add (register + register, 64 bit)
+AGR Z 10111001 00001000 00000000 r1:4 r2:4
+
+# format:RRE Add (register + register, 32 bit to 64 bit)
+AGFR Z 10111001 00011000 00000000 r1:4 r2:4
+
+# format:RRF-a Add (three registers, 32 bit)
+ARK STFLE45 10111001 11111000 r3:4 0000 r1:4 r2:4
+
+# format:RRF-a Add (three registers, 64 bit)
+AGRK STFLE45 10111001 11101000 r3:4 0000 r1:4 r2:4
+
+
+# format:RRE Add Halfword Immediate (32 bit)
+AHI Z 10100111 r1:4 1010 i2:16
+
+# format:RI Add Halfword Immediate (64 bit)
+AGHI Z 10100111 r1:4 1011 i2:16
+
+
+# format:RR Add Logical (32 bit)
+ALR Z 00011110 r1:4 r2:4
+
+# format:RRE Add Logical (64 bit)
+ALGR Z 10111001 00001010 00000000 r1:4 r2:4
+
+# format:RRE Add Logical (32 bit to 64 bit)
+ALGFR Z 10111001 00011010 00000000 r1:4 r2:4
+
+
+# format:RRF-c Population Count
+POPCNT STFLE45 10111001 11100001 m3:4 0000 r1:4 r2:4
This only adds a limited set of s390x instructions for initial testing. More instructions will be added later. Signed-off-by: Thomas Huth <thuth@redhat.com> --- s390x.risu | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 s390x.risu