def ast(self,
astree: AbstractSyntaxTree,
iaddr: str,
bytestring: str,
xdata: InstrXData) -> List[ASTInstruction]:
tgtx = str(xdata.xprs[0])
if tgtx == "$ra_in":
return []
elif self.is_call(xdata) and xdata.has_call_target():
calltarget = xdata.call_target(self.ixd)
tgtname = calltarget.name
tgtxpr = self.target_expr_ast(astree, xdata)
(lhs, assigns) = self.lhs_ast(astree, iaddr, xdata)
args = self.arguments(xdata)
argxprs: List[ASTExpr] = []
for arg in args:
if XU.is_struct_field_address(arg, astree):
addr = XU.xxpr_to_struct_field_address_expr(arg, astree)
elif arg.is_string_reference:
xpr = XU.xxpr_to_ast_expr(arg, astree)
cstr = arg.constant.string_reference()
saddr = hex(arg.constant.value)
argxprs.append(astree.mk_string_constant(xpr, cstr, saddr))
elif arg.is_argument_value:
argindex = arg.argument_index()
funarg = astree.function_argument(argindex)
if funarg:
astxpr = astree.mk_register_variable_expr(
funarg.name, vtype=funarg.typ, parameter=argindex)
argxprs.append(astxpr)
else:
astxpr = XU.xxpr_to_ast_expr(arg, astree)
argxprs.append(astxpr)
else:
astxpr = XU.xxpr_to_ast_expr(arg, astree)
argxprs.append(astxpr)
if lhs.is_ignored:
call: ASTInstruction = astree.mk_call(lhs, tgtxpr, argxprs)
astree.add_instruction_span(call.id, iaddr, bytestring)
return [call]
else:
call = cast(ASTInstruction, astree.mk_call(lhs, tgtxpr, argxprs))
astree.add_instruction_span(call.id, iaddr, bytestring)
for assign in assigns:
astree.add_instruction_span(assign.id, iaddr, bytestring)
return [call] + assigns
else:
# TODO: accomodate indirect jumps
return []
def ast(self,
astree: AbstractSyntaxTree,
iaddr: str,
bytestring: str,
xdata: InstrXData) -> List[ASTInstruction]:
if self.is_call(xdata) and xdata.has_call_target():
calltarget = xdata.call_target(self.ixd)
tgtname = calltarget.name
tgtxpr = self.target_expr_ast(astree, xdata)
(lhs, assigns) = self.lhs_ast(astree, iaddr, xdata)
args = self.arguments(xdata)
argregs = ["R0", "R1", "R2", "R3"]
callargs = argregs[:len(args)]
argxprs: List[ASTExpr] = []
for (reg, arg) in zip(callargs, args):
if XU.is_struct_field_address(arg, astree):
addr = XU.xxpr_to_struct_field_address_expr(arg, astree)
argxprs.append(addr)
elif arg.is_string_reference:
regast = astree.mk_register_variable_expr(reg)
cstr = arg.constant.string_reference()
saddr = hex(arg.constant.value)
argxprs.append(astree.mk_string_constant(regast, cstr, saddr))
elif arg.is_argument_value:
argindex = arg.argument_index()
funarg = astree.function_argument(argindex)
if funarg:
astxpr = astree.mk_register_variable_expr(
funarg.name, vtype=funarg.typ, parameter=argindex)
argxprs.append(astxpr)
else:
argxprs.append(astree.mk_register_variable_expr(reg))
else:
argxprs.append(astree.mk_register_variable_expr(reg))
if len(args) > 4:
for a in args[4:]:
argxprs.append(XU.xxpr_to_ast_expr(a, astree))
if lhs.is_ignored:
call: ASTInstruction = astree.mk_call(lhs, tgtxpr, argxprs)
astree.add_instruction_span(call.id, iaddr, bytestring)
return [call]
else:
call = cast(ASTInstruction, astree.mk_call(lhs, tgtxpr, argxprs))
astree.add_instruction_span(call.id, iaddr, bytestring)
for assign in assigns:
astree.add_instruction_span(assign.id, iaddr, bytestring)
return [call] + assigns
else:
return self.assembly_ast(astree, iaddr, bytestring, xdata)
def assembly_ast(self, astree: AbstractSyntaxTree, iaddr: str,
bytestring: str,
xdata: InstrXData) -> List[ASTInstruction]:
lhs = astree.mk_register_variable_lval("R0")
tgt = self.operands[0]
if tgt.is_absolute:
tgtaddr = cast(ARMAbsoluteOp, tgt.opkind)
if self.app.has_function_name(tgtaddr.address.get_hex()):
faddr = tgtaddr.address.get_hex()
fnsymbol = self.app.function_name(faddr)
tgtxpr: ASTExpr = astree.mk_global_variable_expr(
fnsymbol, globaladdress=int(str(tgtaddr.address), 16))
else:
(tgtxpr, _, _) = self.operands[0].ast_rvalue(astree)
else:
(tgtxpr, _, _) = self.operands[0].ast_rvalue(astree)
call = astree.mk_call(lhs, tgtxpr, [])
astree.add_instruction_span(call.id, iaddr, bytestring)
return [call]