commit 09de7433abd4e0dda15a065af0d81f88d29bf176
Author: Elliot Nunn <elliotnunn@me.com>
Date:   Thu Feb 8 15:50:22 2018 +0800

    Extract 68k Emulator from ROM as assembly code

diff --git a/RomExtractor.py b/RomExtractor.py
new file mode 100755
index 0000000..f66a19a
--- /dev/null
+++ b/RomExtractor.py
@@ -0,0 +1,53 @@
+#!/usr/bin/env python3
+
+from sys import argv, stderr
+import struct
+
+CR = '\r'
+
+ROMSIZE = 0x400000
+EMBASE = 0x360000
+
+try:
+    rom_path, = argv[1:]
+
+    with open(rom_path, 'rb') as f:
+        rom = f.read(ROMSIZE)
+
+    if len(rom) != ROMSIZE:
+        raise ValueError
+
+except:
+    print('USAGE: %s ROM > ASM.s' % argv[0], file=stderr)
+    print('       empw PPCAsm -o Emulator.x ASM.s', file=stderr)
+    exit(1)
+
+# read special offsets into emulator, from ConfigInfo struct
+em_entry, em_kernel_trap_table = struct.unpack_from('>LL', rom, 0x30d080)
+
+labels = {
+    EMBASE: ['EmTop'],
+    0x380000: ['EmBtm', 'OpcodeTblTop'],
+    ROMSIZE: ['OpcodeTblBtm'],
+    EMBASE + em_entry: ['EmEntry'],
+    EMBASE + em_kernel_trap_table: ['EmKernelTrapTable'],
+}
+
+for k, vs in sorted(labels.items()):
+    for v in vs:
+        print('\texport\t%s\t; %x' % (v, k), end=CR)
+print(end=CR)
+
+for o in range(EMBASE, ROMSIZE+4, 4):
+    try:
+        lbls = labels[o]
+    except KeyError:
+        pass
+    else:
+        for lbl in lbls:
+            print(lbl + ':', end=CR)
+
+    if o == ROMSIZE:
+        break
+
+    print('\tdc.l\t$%02x%02x%02x%02x\t; %x' % (rom[o], rom[o+1], rom[o+2], rom[o+3], o), end=CR)