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https://gitlab.com/xCrystal/pokecrystal-board.git
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backtracking and labeling for the disassembler
This commit is contained in:
Bryan Bishop
parent
10a5a6518d
commit
cd60a1f0e4
@ -150,7 +150,7 @@ class Asm:
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asm_commands = {}
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offset = start_address
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last_hl_address = None
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last_a_address = None
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used_3d97 = False
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@ -161,16 +161,20 @@ class Asm:
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# read the current opcode byte
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current_byte = ord(rom[offset])
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current_byte_number = len(asm_commands.keys())
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# setup this next/upcoming command
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asm_command = {
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"address": offset,
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# setup this next/upcoming command
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if offset in asm_commands.keys():
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asm_command = asm_commands[offset]
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else:
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asm_command = {}
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asm_command["address"] = offset
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if not "references" in asm_command.keys():
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# This counts how many times relative jumps reference this
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# byte. This is used to determine whether or not to print out a
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# label later.
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"references": 0,
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}
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asm_command["references"] = 0
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# some commands have two opcodes
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next_byte = ord(rom[offset+1])
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@ -185,7 +189,7 @@ class Asm:
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op_code = possible_opcode
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else:
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op_code = current_byte
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op = opt_table[op_code]
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opstr = op[0].lower()
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@ -195,29 +199,35 @@ class Asm:
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asm_command["id"] = op_code
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asm_command["format"] = opstr
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asm_command["opnumberthing"] = optype
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if "x" in opstr:
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for x in range(0, opstr.count("x")):
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insertion = ord(rom[offset + 1])
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# Certain opcodes will have a local relative jump label
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# here instead of a raw hex value, but this is
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# controlled through asm output.
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insertion = "$" + hex(insertion)[2:]
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opstr = opstr[:opstr.find("x")].lower() + insertion + opstr[opstr.find("x")+1:].lower()
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current_byte_number += 1
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offset += 1
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offset += 1
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if "?" in opstr:
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for y in range(0, opstr.count("?")):
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byte1 = ord(rom[offset + 1])
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byte2 = ord(rom[offset + 2])
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number = byte1
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number += byte2 << 8;
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# In most cases, you can use a label here. Labels will
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# be shown during asm output.
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insertion = "$%.4x" % (number)
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opstr = opstr[:opstr.find("?")].lower() + insertion + opstr[opstr.find("?")+1:].lower()
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current_byte_number += 2
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offset += 2
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@ -227,19 +237,35 @@ class Asm:
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# generate a label for the byte we're jumping to
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target_address = offset + 2 + c_int8(ord(rom[offset + 1])).value
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if target_address in byte_labels.keys():
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byte_labels[target_address]["usage"] = 1 + byte_labels[target_address]["usage"]
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line_label2 = byte_labels[target_address]["name"]
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if target_address in asm_commands.keys():
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asm_commands[target_address]["references"] += 1
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remote_label = "asm_" + hex(target_address)
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asm_commands[target_address]["current_label"] = remote_label
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asm_command["remote_label"] = remote_label
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asm_command["use_remote_label"] = True
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else:
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line_label2 = asm_label(target_address)
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byte_labels[target_address] = {}
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byte_labels[target_address]["name"] = line_label2
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byte_labels[target_address]["usage"] = 1
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byte_labels[target_address]["definition"] = False
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remote_label = "asm_" + hex(target_address)
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insertion = line_label2.lower()
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include_comment = True
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# This remote address might not be part of this
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# function.
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asm_commands[target_address] = {
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"references": 1,
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"current_label": remote_label,
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}
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# Also, target_address can be negative (before the
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# start_address that the user originally requested),
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# and it shouldn't be shown on asm output because the
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# intermediate bytes (between a negative target_address
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# and start_address) won't be disassembled.
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# Don't know yet if this remote address is part of this
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# function or not. When the remote address is not part
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# of this function, the label name should not be used,
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# because that label will not be disassembled in the
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# output, until the user asks it to.
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asm_command["use_remote_label"] = "unknown"
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asm_command["remote_label"] = remote_label
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elif current_byte == 0x3e:
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last_a_address = ord(rom[offset + 1])
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@ -253,7 +279,7 @@ class Asm:
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if current_byte == 0xcd:
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if number == 0x3d97:
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used_3d97 = True
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if current_byte == 0xc3 or current_byte in relative_unconditional_jumps:
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if current_byte == 0xc3:
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if number == 0x3d97:
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@ -280,9 +306,9 @@ class Asm:
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# ROM probably doesn't represent instructions.
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asm_command["type"] = "data" # db
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asm_command["value"] = current_byte
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# save this new command in the list
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asm_commands[current_byte_number] = asm_command
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asm_commands[asm_command["address"]] = asm_command
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def __str__(self):
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""" ASM pretty printer.
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