Make the exception dump parser output the disassembly of the dumped code (when it's possible)
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TuxSH
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@ -22,9 +22,9 @@
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# Notices displayed by works containing it.
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__author__ = "TuxSH"
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__copyright__ = "Copyright (c) 2016 TuxSH"
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__copyright__ = "Copyright (c) 2016 TuxSH"
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__license__ = "GPLv3"
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__version__ = "v1.0"
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__version__ = "v1.2"
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"""
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Parses Luma3DS exception dumps
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@ -33,6 +33,9 @@ Parses Luma3DS exception dumps
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import argparse
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from struct import unpack_from
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import os
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import subprocess
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# Source of hexdump: https://gist.github.com/ImmortalPC/c340564823f283fe530b
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# Credits for hexdump go to the original authors
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# Slightly edited by TuxSH
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@ -76,14 +79,14 @@ def hexdump(addr, src, length=16, sep='.' ):
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text += chr(c)
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else:
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text += sep
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result.append(('%08X: %-'+str(length*(2+1)+1)+'s |%s|') % (addr + i, hexa, text))
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result.append(('%08x: %-'+str(length*(2+1)+1)+'s |%s|') % (addr + i, hexa, text))
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return '\n'.join(result)
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def makeRegisterLine(A, rA, B, rB):
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return "{0:<15}{1:<20}{2:<15}{3:<20}".format(A, "{0:08x}".format(rA), B, "{0:08x}".format(rB))
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handledExceptionNames = ("FIQ", "undefined instruction", "prefetch abort", "data abort")
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registerNames = tuple("r{0}".format(i) for i in range(13)) + ("sp", "lr", "pc", "cpsr") + ("dfsr", "ifsr", "far") + ("fpexc", "fpinst", "fpinst2")
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svcBreakReasons = ("(svcBreak: panic)", "(svcBreak: assertion failed)", "(svcBreak: user-related)")
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@ -96,23 +99,24 @@ if __name__ == "__main__":
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with open(args.filename, "rb") as f: data = f.read()
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if unpack_from("<2I", data) != (0xdeadc0de, 0xdeadcafe):
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raise SystemExit("Invalid file format")
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version, processor, exceptionType, _, nbRegisters, codeDumpSize, stackDumpSize, additionalDataSize = unpack_from("<8I", data, 8)
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nbRegisters //= 4
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if version < (1 << 16) | 2:
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raise SystemExit("Incompatible format version, please use the appropriate parser.")
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registers = unpack_from("<{0}I".format(nbRegisters), data, 40)
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codeDump = data[40 + 4 * nbRegisters : 40 + 4 * nbRegisters + codeDumpSize]
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stackOffset = 40 + 4 * nbRegisters + codeDumpSize
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codeOffset = 40 + 4 * nbRegisters
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codeDump = data[codeOffset : codeOffset + codeDumpSize]
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stackOffset = codeOffset + codeDumpSize
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stackDump = data[stackOffset : stackOffset + stackDumpSize]
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addtionalDataOffset = stackOffset + stackDumpSize
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additionalData = data[addtionalDataOffset : addtionalDataOffset + additionalDataSize]
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if processor == 9: print("Processor: ARM9")
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else: print("Processor: ARM11 (core {0})".format(processor >> 16))
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typeDetailsStr = ""
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if exceptionType == 2:
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if (registers[16] & 0x20) == 0 and codeDumpSize >= 4:
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@ -125,23 +129,41 @@ if __name__ == "__main__":
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instr = unpack_from("<I", codeDump[-4:])[0]
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if instr == 0xdf3c:
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typeDetailsStr = " " + (svcBreakReasons[registers[0]] if registers[0] < 3 else "(svcBreak)")
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elif processor != 9 and (registers[20] & 0x80000000) != 0:
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typeDetailsStr = " (VFP exception)"
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print("Exception type: {0}{1}".format("unknown" if exceptionType >= len(handledExceptionNames) else handledExceptionNames[exceptionType], typeDetailsStr))
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if additionalDataSize != 0:
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print("Current process: {0} ({1:016x})".format(additionalData[:8].decode("ascii"), unpack_from("<Q", additionalData, 8)[0]))
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print("\nRegister dump:\n")
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for i in range(0, nbRegisters - (nbRegisters % 2), 2):
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if i == 16: print("")
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print(makeRegisterLine(registerNames[i], registers[i], registerNames[i+1], registers[i+1]))
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if nbRegisters % 2 == 1: print("{0:<15}{1:<20}".format(registerNames[nbRegisters - 1], "{0:08x}".format(registers[nbRegisters - 1])))
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thumb = registers[16] & 0x20 != 0
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addr = registers[15] - codeDumpSize + (2 if thumb else 4)
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print("\nCode dump:\n")
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print(hexdump(registers[15] - codeDumpSize + (4 if (registers[16] & 0x20 == 0) else 2), codeDump))
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objdump_res = ""
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try:
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path = os.path.join(os.environ["DEVKITARM"], "bin", "arm-none-eabi-objdump")
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if os.name == "nt":
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path = ''.join((path[1], ':', path[2:])).replace('/', '\\')
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objdump_res = subprocess.check_output((
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path, "-marm", "-b", "binary",
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"--adjust-vma="+hex(addr - codeOffset), "--start-address="+hex(addr),
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"--stop-address="+hex(addr + codeDumpSize), "-D", "-z", "-M",
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"reg-names-std" + (",force-thumb" if thumb else ""), args.filename
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)).decode("utf-8")
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objdump_res = '\n'.join(objdump_res[objdump_res.find('<.data+'):].split('\n')[1:])
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except: objdump_res = ""
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print(objdump_res if objdump_res != "" else hexdump(addr, codeDump))
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print("\nStack dump:\n")
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print(hexdump(registers[13], stackDump))
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