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broken disassembler

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This commit is contained in:
Bryan Bishop 2012-06-10 22:55:05 -05:00
parent 1e162437ab
commit b19db1e604
1 changed files with 26 additions and 5 deletions
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31
extras/romstr.py
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@ -121,7 +121,7 @@ class Asm:
# check more edge cases # check more edge cases
if not start_address >= 0: if not start_address >= 0:
raise Exception, "start_address must be at least 0" raise Exception, "start_address must be at least 0"
elif not end_address >= 0: elif end_address != None and not end_address >= 0:
raise Exception, "end_address must be at least 0" raise Exception, "end_address must be at least 0"
self.rom = rom self.rom = rom
@ -157,7 +157,7 @@ class Asm:
keep_reading = True keep_reading = True
while offset <= end_address and keep_reading: while (end_address != 0 and offset <= end_address) or keep_reading:
# read the current opcode byte # read the current opcode byte
current_byte = ord(rom[offset]) current_byte = ord(rom[offset])
current_byte_number = len(asm_commands.keys()) current_byte_number = len(asm_commands.keys())
@ -176,11 +176,19 @@ class Asm:
# label later. # label later.
asm_command["references"] = 0 asm_command["references"] = 0
print "debug1"
# some commands have two opcodes # some commands have two opcodes
next_byte = ord(rom[offset+1]) next_byte = ord(rom[offset+1])
print "offset: \t\t" + hex(offset)
print "current_byte: \t\t" + hex(current_byte)
print "next_byte: \t\t" + hex(next_byte)
# all two-byte opcodes also have their first byte in there somewhere # all two-byte opcodes also have their first byte in there somewhere
if current_byte in opt_table.keys(): if (current_byte in opt_table.keys()) or ((current_byte + (next_byte << 8)) in opt_table.keys()):
print "debug2"
# this might be a two-byte opcode # this might be a two-byte opcode
possible_opcode = current_byte + (next_byte << 8) possible_opcode = current_byte + (next_byte << 8)
@ -195,12 +203,15 @@ class Asm:
opstr = op[0].lower() opstr = op[0].lower()
optype = op[1] optype = op[1]
print "opstr: " + opstr
asm_command["type"] = "op" asm_command["type"] = "op"
asm_command["id"] = op_code asm_command["id"] = op_code
asm_command["format"] = opstr asm_command["format"] = opstr
asm_command["opnumberthing"] = optype asm_command["opnumberthing"] = optype
if "x" in opstr: if "x" in opstr:
print "debug3"
for x in range(0, opstr.count("x")): for x in range(0, opstr.count("x")):
insertion = ord(rom[offset + 1]) insertion = ord(rom[offset + 1])
@ -215,6 +226,7 @@ class Asm:
offset += 1 offset += 1
if "?" in opstr: if "?" in opstr:
print "debug4"
for y in range(0, opstr.count("?")): for y in range(0, opstr.count("?")):
byte1 = ord(rom[offset + 1]) byte1 = ord(rom[offset + 1])
byte2 = ord(rom[offset + 2]) byte2 = ord(rom[offset + 2])
@ -234,10 +246,13 @@ class Asm:
# Check for relative jumps, construct the formatted asm line. # Check for relative jumps, construct the formatted asm line.
# Also set the usage of labels. # Also set the usage of labels.
if current_byte in [0x18, 0x20] or current_byte in relative_jumps: # jr or jr nz if current_byte in [0x18, 0x20] or current_byte in relative_jumps: # jr or jr nz
print "debug5"
# generate a label for the byte we're jumping to # generate a label for the byte we're jumping to
target_address = offset + 2 + c_int8(ord(rom[offset + 1])).value target_address = offset + 2 + c_int8(ord(rom[offset + 1])).value
if target_address in asm_commands.keys(): if target_address in asm_commands.keys():
print "debug6"
asm_commands[target_address]["references"] += 1 asm_commands[target_address]["references"] += 1
remote_label = "asm_" + hex(target_address) remote_label = "asm_" + hex(target_address)
asm_commands[target_address]["current_label"] = remote_label asm_commands[target_address]["current_label"] = remote_label
@ -245,6 +260,7 @@ class Asm:
asm_command["use_remote_label"] = True asm_command["use_remote_label"] = True
else: else:
print "debug7"
remote_label = "asm_" + hex(target_address) remote_label = "asm_" + hex(target_address)
# This remote address might not be part of this # This remote address might not be part of this
@ -281,6 +297,7 @@ class Asm:
used_3d97 = True used_3d97 = True
if current_byte == 0xc3 or current_byte in relative_unconditional_jumps: if current_byte == 0xc3 or current_byte in relative_unconditional_jumps:
print "debug8"
if current_byte == 0xc3: if current_byte == 0xc3:
if number == 0x3d97: if number == 0x3d97:
used_3d97 = True used_3d97 = True
@ -291,6 +308,7 @@ class Asm:
# stop reading at a jump, relative jump or return # stop reading at a jump, relative jump or return
if current_byte in end_08_scripts_with: if current_byte in end_08_scripts_with:
print "debug9"
is_data = False is_data = False
if not has_outstanding_labels(byte_labels) and all_outstanding_labels_are_reverse(byte_labels, offset): if not has_outstanding_labels(byte_labels) and all_outstanding_labels_are_reverse(byte_labels, offset):
@ -306,9 +324,12 @@ class Asm:
# ROM probably doesn't represent instructions. # ROM probably doesn't represent instructions.
asm_command["type"] = "data" # db asm_command["type"] = "data" # db
asm_command["value"] = current_byte asm_command["value"] = current_byte
keep_reading = False
# save this new command in the list # save this new command in the list
asm_commands[asm_command["address"]] = asm_command asm_commands[asm_command["address"]] = asm_command
self.asm_commands = asm_commands
print "debug10"
def __str__(self): def __str__(self):
""" ASM pretty printer. """ ASM pretty printer.