ctr_loader.py

#!/usr/bin/python

import sys
import struct
import idaapi
from idc import *

class NCSDLoader(object):

class FIRMLoader(object):
	@staticmethod
	def get_type(f):
		if f.read(4) == "FIRM":
			return "Nintendo 3DS FIRM"
	@staticmethod
	def accept_file(f):
		return FIRMLoader.get_type(f)
	@staticmethod
	def load_file(f):
		f.seek(0x8)
		arm11entry, arm9entry, = struct.unpack("ii", f.read(0x8))
		AddEntryPoint(0, arm11entry, "arm11entrypoint", 1)
		AddEntryPoint(1, arm9entry,  "arm9entrypoint",  1)

		for offset in range(0x40, 0x100, 0x30):
			f.seek(offset)
			segoffset, physaddr, size, = struct.unpack("iii", f.read(0xC))
			f.file2base(segoffset, physaddr, physaddr + size, 0)
			AddSeg(physaddr, physaddr + size, segoffset, 1, 0, 0)

LOADERS = [FIRMLoader]

def find_loader(f):
	for loader in LOADERS:
		f.seek(0x00)
		if loader.accept_file(f): return loader


def get_type(f):
	loader = find_loader(f)
	if loader:
		f.seek(0x00)
		return loader.get_type(f)

def accept_file(f, n):
	if n == 0:
		loader = find_loader(f)
		if loader:
			f.seek(0x00)
			return loader.accept_file(f)


def load_file(f, neflags, format):
	idaapi.set_processor_type("ARM", SETPROC_ALL|SETPROC_FATAL)

	loader = find_loader(f)
	if loader:
		f.seek(0x00)
		return loader.load_file(f)