From fb94a6341673b852110eff23535457d35f929ea5 Mon Sep 17 00:00:00 2001
From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Fri, 21 May 2021 12:58:25 +0100
Subject: [PATCH] add first command-line version of ISACaller

---
 .gitignore                              |   2 +
 src/openpower/decoder/isa/pypowersim.py | 156 ++++++++++++++++++++++++
 2 files changed, 158 insertions(+)
 create mode 100644 src/openpower/decoder/isa/pypowersim.py

diff --git a/.gitignore b/.gitignore
index b4bd847f..dfab3e4f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 .*.sw?
 __pycache__
+build
+dist
diff --git a/src/openpower/decoder/isa/pypowersim.py b/src/openpower/decoder/isa/pypowersim.py
new file mode 100644
index 00000000..ab03138b
--- /dev/null
+++ b/src/openpower/decoder/isa/pypowersim.py
@@ -0,0 +1,156 @@
+from nmigen import Module, Signal
+from nmigen.back.pysim import Simulator, Delay, Settle
+import string
+import sys
+import getopt
+from openpower.decoder.power_decoder import create_pdecode
+from openpower.decoder.power_decoder2 import (PowerDecode2)
+from openpower.simulator.program import Program
+from openpower.decoder.selectable_int import SelectableInt
+from openpower.decoder.orderedset import OrderedSet
+from openpower.decoder.isa.all import ISA
+
+
+def convert_to_num(num):
+    # detect number types
+    if num.isdigit():
+        return int(reg)
+    if num.startswith("0b"):
+        return int(value[2], 2)
+    if value.startswith("0x"):
+        return int(value[2], 16)
+    return num
+
+
+def read_entries(fname, listqty=None):
+    """read_entries: reads values from a file of the format "x: y", per line
+    can be used for memory, or regfiles (GPR, SPR, FP).  regs and entries may
+    start with "0x" or "0b" for hex or binary
+    """
+    regs = {}
+    with open(fname) as f:
+        for line in f.readlines():
+            # split line "x : y" into ["x", "y"], remove spaces
+            line = map(string.strip, line.strip().split(":"))
+            assert len(line) == 2, "regfile line must be formatted 'x : y'"
+            reg, val = line
+            reg = convert_to_num(reg)
+            val = convert_to_num(val)
+            assert reg not in regs, "duplicate entry %s" % (repr(reg))
+            regs[reg] = val
+
+    # post-process into a list.
+    if listqty is None:
+        return regs
+    result = [0] * listqty
+    for reg, value in regs.items():
+        assert isinstance(reg, int), "list must be int, %s found" % reg
+        assert reg < listqty, "entry %s too large for list %s" % (reg, listqty)
+        result[reg] = value
+
+    return result
+
+
+def run_tst(args, generator, initial_regs, 
+                             initial_sprs=None, svstate=0, mmu=False,
+                             initial_cr=0, mem=None,
+                             initial_fprs=None):
+    if initial_regs is None:
+        initial_regs = [0] * 32
+    if initial_sprs is None:
+        initial_sprs = {}
+
+    m = Module()
+    comb = m.d.comb
+    instruction = Signal(32)
+
+    pdecode = create_pdecode(include_fp=initial_fprs is not None)
+
+    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,
+                    fpregfile=initial_fprs,
+                    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)
+    sim.run()
+
+    return simulator
+
+
+if __name__ == "__main__":
+
+    binaryname = None
+    initial_regs = None
+    lst = None
+
+    try:
+        opts, args = getopt.getopt(sys.argv[1:], "i:l:g:f:", 
+                                   ["binary", "listing",
+                                    "intregs"])
+      
+    except:
+        sys.stderr.write("Command-line Error\n")
+        exit(-1)
+
+    for opt, arg in opts:
+        if opt in ['-i', '--binary']:
+            binaryname = arg
+        elif opt in ['-l', '--listing']:
+            lst = arg
+        elif opt in ['g', '--intregs']:
+            initial_regs = read_entries(arg, 32)
+
+    if binaryname is None and lst is None:
+        sys.stderr.write("Must give binary or listing\n")
+        exit(-1)
+
+    if lst:
+        with open(lst, "r") as f:
+            lst = list(f.readlines())
+
+    if binaryname:
+        with open(binaryname, "rb") as f:
+            lst = f.read()
+
+    with Program(lst, bigendian=False) as prog:
+        simulator = run_tst(None, prog,
+                            initial_regs,
+                            initial_sprs=None, svstate=0, mmu=False,
+                            initial_cr=0, mem=None,
+                            initial_fprs=None)
+        simulator.gpr.dump()
+        simulator.fpr.dump()
-- 
2.30.2