First commit

CC0

@@ -0,0 +1,116 @@
+CC0 1.0 Universal
+
+Statement of Purpose
+
+The laws of most jurisdictions throughout the world automatically confer
+exclusive Copyright and Related Rights (defined below) upon the creator and
+subsequent owner(s) (each and all, an "owner") of an original work of
+authorship and/or a database (each, a "Work").
+
+Certain owners wish to permanently relinquish those rights to a Work for the
+purpose of contributing to a commons of creative, cultural and scientific
+works ("Commons") that the public can reliably and without fear of later
+claims of infringement build upon, modify, incorporate in other works, reuse
+and redistribute as freely as possible in any form whatsoever and for any
+purposes, including without limitation commercial purposes. These owners may
+contribute to the Commons to promote the ideal of a free culture and the
+further production of creative, cultural and scientific works, or to gain
+reputation or greater distribution for their Work in part through the use and
+efforts of others.
+
+For these and/or other purposes and motivations, and without any expectation
+of additional consideration or compensation, the person associating CC0 with a
+Work (the "Affirmer"), to the extent that he or she is an owner of Copyright
+and Related Rights in the Work, voluntarily elects to apply CC0 to the Work
+and publicly distribute the Work under its terms, with knowledge of his or her
+Copyright and Related Rights in the Work and the meaning and intended legal
+effect of CC0 on those rights.
+
+1. Copyright and Related Rights. A Work made available under CC0 may be
+protected by copyright and related or neighboring rights ("Copyright and
+Related Rights"). Copyright and Related Rights include, but are not limited
+to, the following:
+
+  i. the right to reproduce, adapt, distribute, perform, display, communicate,
+  and translate a Work;
+
+  ii. moral rights retained by the original author(s) and/or performer(s);
+
+  iii. publicity and privacy rights pertaining to a person's image or likeness
+  depicted in a Work;
+
+  iv. rights protecting against unfair competition in regards to a Work,
+  subject to the limitations in paragraph 4(a), below;
+
+  v. rights protecting the extraction, dissemination, use and reuse of data in
+  a Work;
+
+  vi. database rights (such as those arising under Directive 96/9/EC of the
+  European Parliament and of the Council of 11 March 1996 on the legal
+  protection of databases, and under any national implementation thereof,
+  including any amended or successor version of such directive); and
+
+  vii. other similar, equivalent or corresponding rights throughout the world
+  based on applicable law or treaty, and any national implementations thereof.
+
+2. Waiver. To the greatest extent permitted by, but not in contravention of,
+applicable law, Affirmer hereby overtly, fully, permanently, irrevocably and
+unconditionally waives, abandons, and surrenders all of Affirmer's Copyright
+and Related Rights and associated claims and causes of action, whether now
+known or unknown (including existing as well as future claims and causes of
+action), in the Work (i) in all territories worldwide, (ii) for the maximum
+duration provided by applicable law or treaty (including future time
+extensions), (iii) in any current or future medium and for any number of
+copies, and (iv) for any purpose whatsoever, including without limitation
+commercial, advertising or promotional purposes (the "Waiver"). Affirmer makes
+the Waiver for the benefit of each member of the public at large and to the
+detriment of Affirmer's heirs and successors, fully intending that such Waiver
+shall not be subject to revocation, rescission, cancellation, termination, or
+any other legal or equitable action to disrupt the quiet enjoyment of the Work
+by the public as contemplated by Affirmer's express Statement of Purpose.
+
+3. Public License Fallback. Should any part of the Waiver for any reason be
+judged legally invalid or ineffective under applicable law, then the Waiver
+shall be preserved to the maximum extent permitted taking into account
+Affirmer's express Statement of Purpose. In addition, to the extent the Waiver
+is so judged Affirmer hereby grants to each affected person a royalty-free,
+non transferable, non sublicensable, non exclusive, irrevocable and
+unconditional license to exercise Affirmer's Copyright and Related Rights in
+the Work (i) in all territories worldwide, (ii) for the maximum duration
+provided by applicable law or treaty (including future time extensions), (iii)
+in any current or future medium and for any number of copies, and (iv) for any
+purpose whatsoever, including without limitation commercial, advertising or
+promotional purposes (the "License"). The License shall be deemed effective as
+of the date CC0 was applied by Affirmer to the Work. Should any part of the
+License for any reason be judged legally invalid or ineffective under
+applicable law, such partial invalidity or ineffectiveness shall not
+invalidate the remainder of the License, and in such case Affirmer hereby
+affirms that he or she will not (i) exercise any of his or her remaining
+Copyright and Related Rights in the Work or (ii) assert any associated claims
+and causes of action with respect to the Work, in either case contrary to
+Affirmer's express Statement of Purpose.
+
+4. Limitations and Disclaimers.
+
+  a. No trademark or patent rights held by Affirmer are waived, abandoned,
+  surrendered, licensed or otherwise affected by this document.
+
+  b. Affirmer offers the Work as-is and makes no representations or warranties
+  of any kind concerning the Work, express, implied, statutory or otherwise,
+  including without limitation warranties of title, merchantability, fitness
+  for a particular purpose, non infringement, or the absence of latent or
+  other defects, accuracy, or the present or absence of errors, whether or not
+  discoverable, all to the greatest extent permissible under applicable law.
+
+  c. Affirmer disclaims responsibility for clearing rights of other persons
+  that may apply to the Work or any use thereof, including without limitation
+  any person's Copyright and Related Rights in the Work. Further, Affirmer
+  disclaims responsibility for obtaining any necessary consents, permissions
+  or other rights required for any use of the Work.
+
+  d. Affirmer understands and acknowledges that Creative Commons is not a
+  party to this document and has no duty or obligation with respect to this
+  CC0 or use of the Work.
+
+For more information, please see
+<http://creativecommons.org/publicdomain/zero/1.0/>

thingamajig_disasm.py

@@ -0,0 +1,93 @@
+from collections import namedtuple
+
+Opcode = namedtuple('Opcode', ('mnemonic', 'rx', 'ry', 'addr'))
+
+opcodes = [
+	Opcode('halt', rx=False, ry=False, addr=False),
+	Opcode('ret', rx=False, ry=False, addr=False),
+
+	Opcode('shl', rx=True, ry=False, addr=False),
+	Opcode('shr', rx=True, ry=False, addr=False),
+	Opcode('rol', rx=True, ry=False, addr=False),
+	Opcode('ror', rx=True, ry=False, addr=False),
+
+	Opcode('nand', rx=True, ry=True, addr=False),
+	Opcode('and', rx=True, ry=True, addr=False),
+	Opcode('or', rx=True, ry=True, addr=False),
+	Opcode('xor', rx=True, ry=True, addr=False),
+
+	Opcode('load', rx=True, ry=False, addr=True),
+	Opcode('store', rx=True, ry=False, addr=True),
+
+	Opcode('breq', rx=True, ry=True, addr=True),
+	Opcode('brneq', rx=True, ry=True, addr=True),
+	Opcode('cleq', rx=True, ry=True, addr=True),
+	Opcode('clneq', rx=True, ry=True, addr=True),
+]
+
+Instruction = namedtuple('Instruction', ['opcode', 'rx', 'ry', 'addr'])
+Data = namedtuple('Data', ['byte'])
+
+Statement = namedtuple('Statement', ['addr', 'contents'])
+
+def segment(binary, origin):
+	statements = []
+	ip = origin
+	while ip < len(binary):
+		byte = binary[ip]
+
+		opcode = byte >> 4
+
+		rx = (byte >> 2) & 3
+		ry = byte & 3
+
+		addr = None
+		if opcodes[opcode].addr:
+			addr = (binary[ip + 1] << 8) + binary[ip + 2]
+
+		valid = True
+		if not opcodes[opcode].rx and rx != 0: valid = False
+		if not opcodes[opcode].ry and ry != 0: valid = False
+
+		if valid:
+			instruction = Instruction(opcode, rx, ry, addr)
+			statements.append(Statement(ip, instruction))
+		else:
+			statements.append(Statement(ip, Data(byte)))
+
+		ip += 1
+		if opcodes[opcode].addr:
+			ip += 2
+
+	return statements
+
+def disasm(binary, origin = 0):
+	for addr, contents in segment(binary, origin):
+		if type(contents) == Data:
+			statement = f'db 0x{contents.byte:02x}'
+		else:
+			mnemonic = opcodes[contents.opcode].mnemonic
+			fields = []
+			if opcodes[contents.opcode].rx:
+				fields.append(f'r{contents.rx}')
+			if opcodes[contents.opcode].ry:
+				fields.append(f'r{contents.ry}')
+			if opcodes[contents.opcode].addr:
+				fields.append(f'0x{contents.addr:04x}')
+
+			if mnemonic == 'store':
+				fields = ', '.join(reversed(fields))
+			else:
+				fields = ', '.join(fields)
+
+			if len(fields) != 0:
+				statement = f'{mnemonic} {fields}'
+			else:
+				statement = mnemonic
+		print(f'{addr:04x} {statement}')
+
+if __name__ == '__main__':
+	import sys
+	with open(sys.argv[1], 'rb') as f:
+		binary = f.read()
+	disasm(binary)