def _lift_op(il: LowLevelILFunction,
insn: SHInsn,
op: Oper,
sign_ext=False):
il_op = None
if op.type == OpType.REG:
if op.reg == "PC":
il_op = il.const(RSIZE, insn.addr)
else:
il_op = il.reg(RSIZE, op.reg)
elif op.type == OpType.IMM or op.type == OpType.DISP:
assert op.size != 0, f"Invalid instruction at: 0x{insn.addr:x}"
if op.type == OpType.DISP and op.is_ref and op.is_pair:
# Fetch the next part of the pair
next_op = None
for i, cur_op in enumerate(insn.opcode["args"]):
if cur_op.is_pair:
next_op = insn.opcode["args"][i + 1]
break
assert next_op is not None, f"Invalid instruction at: 0x{insn.addr:x}"
assert next_op.type == OpType.REG, f"Invalid instruction at: 0x{insn.addr:x}"
if next_op.reg == "PC":
cur_il = il.shift_left(
RSIZE, il.const(RSIZE, op.val),
il.const(RSIZE, int(insn.opcode['width'] / 2)))
if insn.opcode["width"] == 4:
next_il = il.and_expr(RSIZE,
il.const(RSIZE, insn.addr),
il.const(RSIZE, 0xFFFFFFFC))
else:
next_il = il.const(RSIZE, insn.addr)
next_il = il.add(RSIZE, next_il, il.const(RSIZE, 4))
else:
cur_il = il.const(op.size, op.val)
next_il = il.reg(RSIZE, next_op.reg)
il_op = il.add(RSIZE, cur_il, next_il)
else:
il_op = il.const(op.size, op.val)
if sign_ext:
il_op = il.sign_extend(RSIZE, il_op)
return il_op
def lift_movi20s(il: LowLevelILFunction, insn: SHInsn):
assert len(insn.opcode["args"]
) == 2, f"Invalid instruction at: 0x{insn.addr:x}"
op_1 = insn.opcode["args"][0]
op_2 = insn.opcode["args"][1]
assert op_1.type == OpType.IMM, f"Invalid instruction at: 0x{insn.addr:x}"
assert op_1.size != 0, f"Invalid instruction at: 0x{insn.addr:x}"
il.append(
il.set_reg(
RSIZE, op_2.reg,
il.sign_extend(
RSIZE,
il.shift_left(op_1.size, il.const(op_1.size, op_1.val),
il.const(1, 8)))))
def lift_mova(il: LowLevelILFunction, insn: SHInsn):
assert len(insn.opcode["args"]
) == 3, f"Invalid instruction at: 0x{insn.addr:x}"
op_1 = insn.opcode["args"][0]
op_2 = insn.opcode["args"][1]
op_3 = insn.opcode["args"][2]
il.append(
il.set_reg(
RSIZE, op_3.reg,
il.add(
RSIZE,
il.and_expr(RSIZE, il.reg(RSIZE, op_2.reg),
il.const(RSIZE, 0xFFFFFFFC)),
il.add(
RSIZE, il.const(RSIZE, 4),
il.shift_left(RSIZE, il.const(RSIZE, op_1.val),
il.const(RSIZE, 2))))))