miasm/arch/arm/disasm.py
from future.utils import viewvalues
from miasm.core.asmblock import AsmConstraint, disasmEngine
from miasm.arch.arm.arch import mn_arm, mn_armt
def cb_arm_fix_call(mdis, cur_block, offsets_to_dis):
"""
for arm:
MOV LR, PC
LDR PC, [R5, 0x14]
* is a subcall *
"""
if len(cur_block.lines) < 2:
return
l1 = cur_block.lines[-1]
l2 = cur_block.lines[-2]
if l1.name != "LDR":
return
if l2.name != "MOV":
return
values = viewvalues(mdis.arch.pc)
if not l1.args[0] in values:
return
if not l2.args[1] in values:
return
loc_key_cst = mdis.loc_db.get_or_create_offset_location(l1.offset + 4)
cur_block.add_cst(loc_key_cst, AsmConstraint.c_next)
offsets_to_dis.add(l1.offset + 4)
cb_arm_funcs = [cb_arm_fix_call]
def cb_arm_disasm(*args, **kwargs):
for func in cb_arm_funcs:
func(*args, **kwargs)
class dis_armb(disasmEngine):
attrib = 'b'
def __init__(self, bs=None, **kwargs):
super(dis_armb, self).__init__(mn_arm, self.attrib, bs, **kwargs)
self.dis_block_callback = cb_arm_disasm
class dis_arml(disasmEngine):
attrib = 'l'
def __init__(self, bs=None, **kwargs):
super(dis_arml, self).__init__(mn_arm, self.attrib, bs, **kwargs)
self.dis_block_callback = cb_arm_disasm
class dis_armtb(disasmEngine):
attrib = 'b'
def __init__(self, bs=None, **kwargs):
super(dis_armtb, self).__init__(mn_armt, self.attrib, bs, **kwargs)
class dis_armtl(disasmEngine):
attrib = 'l'
def __init__(self, bs=None, **kwargs):
super(dis_armtl, self).__init__(mn_armt, self.attrib, bs, **kwargs)