From 58ea45b96fdcc5660dc5f7f7b051545b0a96fe31 Mon Sep 17 00:00:00 2001
From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Mon, 10 May 2021 17:49:19 +0100
Subject: [PATCH] add first LD/ST exceptions test case for ISACaller

---
 .../isa/test_caller_ldst_exceptions.py        | 102 ++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 src/openpower/decoder/isa/test_caller_ldst_exceptions.py

diff --git a/src/openpower/decoder/isa/test_caller_ldst_exceptions.py b/src/openpower/decoder/isa/test_caller_ldst_exceptions.py
new file mode 100644
index 00000000..409b1957
--- /dev/null
+++ b/src/openpower/decoder/isa/test_caller_ldst_exceptions.py
@@ -0,0 +1,102 @@
+from nmigen import Module, Signal
+from nmigen.back.pysim import Simulator, Delay, Settle
+from nmutil.formaltest import FHDLTestCase
+import unittest
+from openpower.decoder.isa.caller import ISACaller
+from openpower.decoder.power_decoder import (create_pdecode)
+from openpower.decoder.power_decoder2 import (PowerDecode2)
+from openpower.simulator.program import Program
+from openpower.decoder.isa.caller import ISACaller, inject
+from openpower.decoder.selectable_int import SelectableInt
+from openpower.decoder.orderedset import OrderedSet
+from openpower.decoder.isa.all import ISA
+
+
+class Register:
+    def __init__(self, num):
+        self.num = num
+
+def run_tst(generator, initial_regs, initial_sprs=None, svstate=0, mmu=False,
+                                     initial_cr=0,mem=None):
+    if initial_sprs is None:
+        initial_sprs = {}
+    m = Module()
+    comb = m.d.comb
+    instruction = Signal(32)
+
+    pdecode = create_pdecode()
+
+    gen = list(generator.generate_instructions())
+    insncode = generator.assembly.splitlines()
+    instructions = list(zip(gen, insncode))
+
+    m.submodules.pdecode2 = pdecode2 = PowerDecode2(pdecode)
+    simulator = ISA(pdecode2, initial_regs, initial_sprs, initial_cr,
+                    initial_insns=gen, respect_pc=True,
+                    initial_svstate=svstate,
+                    initial_mem=mem,
+                    disassembly=insncode,
+                    bigendian=0,
+                    mmu=mmu)
+    comb += pdecode2.dec.raw_opcode_in.eq(instruction)
+    sim = Simulator(m)
+
+
+    def process():
+
+        yield pdecode2.dec.bigendian.eq(0)  # little / big?
+        pc = simulator.pc.CIA.value
+        index = pc//4
+        while index < len(instructions):
+            print("instr pc", pc)
+            try:
+                yield from simulator.setup_one()
+            except KeyError:  # indicates instruction not in imem: stop
+                break
+            yield Settle()
+
+            ins, code = instructions[index]
+            print("    0x{:X}".format(ins & 0xffffffff))
+            opname = code.split(' ')[0]
+            print(code, opname)
+
+            # ask the decoder to decode this binary data (endian'd)
+            yield from simulator.execute_one()
+            pc = simulator.pc.CIA.value
+            index = pc//4
+
+    sim.add_process(process)
+    with sim.write_vcd("simulator.vcd", "simulator.gtkw",
+                       traces=[]):
+        sim.run()
+    return simulator
+
+
+class DecoderTestCase(FHDLTestCase):
+
+    def test_load_misalign(self):
+        lst = ["addi 2, 0, 0x0010", # get PC off of zero
+               "ldx 3, 1, 0",
+               ]
+        initial_regs = [0] * 32
+        initial_regs[1] = 0xFFFFFFFFFFFFFFFF # deliberately misaligned
+        initial_regs[2] = 0x0008
+        initial_mem = {0x0000: (0x5432123412345678, 8),
+                       0x0008: (0xabcdef0187654321, 8),
+                       0x0020: (0x1828384822324252, 8),
+                        }
+
+        with Program(lst, bigendian=False) as program:
+            sim = self.run_tst_program(program, initial_regs, initial_mem)
+            self.assertEqual(sim.gpr(1), SelectableInt(-1, 64))
+            self.assertEqual(sim.gpr(3), SelectableInt(0, 64))
+            self.assertEqual(sim.spr['DAR'], SelectableInt(-1, 64))
+
+    def run_tst_program(self, prog, initial_regs=[0] * 32, initial_mem=None):
+        simulator = run_tst(prog, initial_regs, mem=initial_mem)
+        simulator.gpr.dump()
+        return simulator
+
+
+if __name__ == "__main__":
+    unittest.main()
-- 
2.30.2