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prolog_finder.py
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prolog_finder.py
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"""
Find potential ARM procedures prolog.
The idea is to detect all the common instructions used to build a function prolog,
that is instructions like PUSH.
Coded by Agustin Gianni (agustin.gianni@gmail.com).
(0xfffffe00, 0x0000b400, eEncodingT1, eSize16)
(0xffffa000, 0xe92d0000, eEncodingT2, eSize32)
(0xffff0fff, 0xf84d0d04, eEncodingT3, eSize32)
(0x0fff0000, 0x092d0000, eEncodingA1, eSize32)
(0x0fff0fff, 0x052d0004, eEncodingA2, eSize32)
"""
import idaapi
import idc
import idautils
import struct
def find_prologs():
push_masks = [(0x0fff0000, 0x092d0000), (0x0fff0fff, 0x052d0004)]
def is_push(opcode):
for mask in push_masks:
if (mask[0] & opcode) == mask[1]:
return True
return False
image_start = idc.MinEA()
image_end = idc.MaxEA()
image_size = image_end - image_start
print "Analyzing image from %.8x-%.8x of size %.8x" % (image_start, image_end, image_size)
for cur_ea in xrange(image_start, image_end, 4):
cur_long = Dword(cur_ea)
if is_push(cur_long):
print "Found candidate at 0x%.8x -> %s" % (cur_ea, GetDisasm(cur_ea))
def find_push_thumb(mark=False):
def is_push(opcode):
return (0xfffffe00 & opcode) == 0x0000b400
image_start = idc.MinEA()
image_end = idc.MaxEA()
image_size = image_end - image_start
print "Analyzing image from %.8x-%.8x of size %.8x" % (image_start, image_end, image_size)
for cur_ea in xrange(image_start, image_end, 2):
cur_word = Word(cur_ea)
if is_push(cur_word) and "DCB" in GetDisasm(cur_ea):
print "Found candidate at 0x%.8x -> %s" % (cur_ea, GetDisasm(cur_ea))
if mark:
MakeCode(cur_ea)
print "Marked candidate at 0x%.8x -> %s" % (cur_ea, GetDisasm(cur_ea))
def find_nops(mark=False):
"""
Look for THUMB nops (0xbf00).
"""
def is_nop(opcode):
return opcode == 0xbf00
image_start = idc.MinEA()
image_end = idc.MaxEA()
image_size = image_end - image_start
print "Analyzing image from %.8x-%.8x of size %.8x" % (image_start, image_end, image_size)
for cur_ea in xrange(image_start, image_end, 2):
cur_word = Word(cur_ea)
if is_nop(cur_word):
print "Found candidate at 0x%.8x -> %s" % (cur_ea, GetDisasm(cur_ea))
if mark:
MakeCode(cur_ea)
find_push_thumb(mark=False)