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use yaxpeax_arch::{AddressDiff, AddressBase, Arch};
use yaxpeax_x86::long_mode::{register_class, Instruction, Operand, Opcode, RegSpec};
use yaxpeax_x86::x86_64;
use data::modifier::ModifierExpression;
use arch::x86_64::analyses::data_flow::{Data, Location};
use analyses::evaluators::const_evaluator::{Domain, ConstEvaluator};
use analyses::static_single_assignment::SSA;
use data::ValueLocations;
use memory::MemoryRange;
use yaxpeax_arch::LengthedInstruction;
pub struct ConcreteDomain;
impl Domain for ConcreteDomain {
type Modifier = ModifierExpression;
type Value = u64;
fn join(l: Option<u64>, r: Option<u64>) -> Option<Self::Value> {
if l == r {
l
} else {
None
}
}
}
fn effective_address(instr: &Instruction, mem_op: &Operand, addr: <x86_64 as Arch>::Address, dfg: &SSA<x86_64>, _contexts: &()) -> Option<u64> {
match mem_op {
Operand::DisplacementU32(disp) => Some(*disp as i32 as i64 as u64),
Operand::DisplacementU64(disp) => Some(*disp),
Operand::RegDisp(RegSpec::RIP, disp) => {
Some((addr.wrapping_offset(instr.len())).wrapping_offset(AddressDiff::from_const(*disp as i64 as u64)))
}
Operand::RegDeref(reg) => {
match dfg.get_use(addr, Location::Register(*reg)).get_data().as_ref() {
Some(Data::Concrete(v, _)) => {
Some(*v)
},
_ => None
}
},
Operand::RegDisp(reg, disp) => {
match dfg.get_use(addr, Location::Register(*reg)).get_data().as_ref() {
Some(Data::Concrete(v, _)) => {
Some(v.wrapping_add(*disp as i64 as u64))
},
_ => None
}
},
Operand::RegScale(reg, scale) => {
match dfg.get_use(addr, Location::Register(*reg)).get_data().as_ref() {
Some(Data::Concrete(v, _)) => {
Some(v.wrapping_mul(*scale as u64))
},
_ => None
}
},
Operand::RegIndexBase(base, index) => {
match (
dfg.get_use(addr, Location::Register(*base)).get_data().as_ref(),
dfg.get_use(addr, Location::Register(*index)).get_data().as_ref()
) {
(Some(Data::Concrete(base, _)), Some(Data::Concrete(index, _))) => {
Some(base.wrapping_add(*index))
},
_ => None
}
},
Operand::RegIndexBaseDisp(base, index, disp) => {
match (
dfg.get_use(addr, Location::Register(*base)).get_data().as_ref(),
dfg.get_use(addr, Location::Register(*index)).get_data().as_ref()
) {
(Some(Data::Concrete(base, _)), Some(Data::Concrete(index, _))) => {
Some(base.wrapping_add(*index).wrapping_add(*disp as i64 as u64))
},
_ => None
}
}
Operand::RegScaleDisp(base, scale, disp) => {
match dfg.get_use(addr, Location::Register(*base)).get_data().as_ref() {
Some(Data::Concrete(base, _)) => {
Some(base.wrapping_add((*disp as i64 as u64).wrapping_mul(*scale as i64 as u64)))
},
_ => None
}
}
Operand::RegIndexBaseScale(index, base, scale) => {
match (
dfg.get_use(addr, Location::Register(*base)).get_data().as_ref(),
dfg.get_use(addr, Location::Register(*index)).get_data().as_ref()
) {
(Some(Data::Concrete(base, _)), Some(Data::Concrete(index, _))) => {
Some(index.wrapping_mul(*scale as u64).wrapping_add(*base))
},
_ => None
}
}
Operand::RegIndexBaseScaleDisp(index, base, scale, disp) => {
match (
dfg.get_use(addr, Location::Register(*base)).get_data().as_ref(),
dfg.get_use(addr, Location::Register(*index)).get_data().as_ref()
) {
(Some(Data::Concrete(base, _)), Some(Data::Concrete(index, _))) => {
Some(index.wrapping_mul(*scale as u64).wrapping_add(*base).wrapping_add(*disp as i64 as u64))
},
_ => None
}
}
_ => None
}
}
impl ConstEvaluator<x86_64, (), ConcreteDomain> for x86_64 {
fn apply_transient(from: <x86_64 as Arch>::Address, to: <x86_64 as Arch>::Address, location: Option<<x86_64 as ValueLocations>::Location>, exprs: &Vec<ModifierExpression>, dfg: &SSA<x86_64>, _contexts: &()) {
for expr in exprs {
match expr {
ModifierExpression::IsNot(_) |
ModifierExpression::Below(_) |
ModifierExpression::Above(_) => { }
ModifierExpression::Is(v) => {
if let Some(loc) = &location {
println!("Applying bound {:?} to location {:?}", expr, loc);
println!("The corresponding def version is: {:?}", dfg.get_transient_def(from, to, loc.clone()).as_rc());
dfg.get_transient_def(from, to, loc.clone()).update(Data::Concrete(*v, None));
}
}
}
}
}
fn evaluate_instruction<U: MemoryRange<x86_64>>(instr: &<x86_64 as Arch>::Instruction, addr: <x86_64 as Arch>::Address, dfg: &SSA<x86_64>, _contexts: &(), _data: &U) {
match instr.opcode() {
Opcode::XOR => {
if let (Operand::Register(l), Operand::Register(r)) = (instr.operand(0), instr.operand(1)) {
if l == r {
dfg.get_def(addr, Location::Register(r)).update(Data::Concrete(0, None));
}
}
},
Opcode::ADD => {
if let (Operand::Register(l), Operand::Register(r)) = (instr.operand(0), instr.operand(1)) {
let l_value = dfg.get_use(addr, Location::Register(l));
let r_value = dfg.get_use(addr, Location::Register(r));
match (l_value.get_data().as_ref(), r_value.get_data().as_ref()) {
(Some(Data::Concrete(l_v, _)), Some(Data::Concrete(r_v, _))) => {
let def_site = if l.class() == register_class::D {
dfg.get_def(addr, Location::Register(RegSpec::q(l.num())))
} else {
dfg.get_def(addr, Location::Register(l))
};
def_site.update(
Data::Concrete(l_v.wrapping_add(*r_v), None)
);
}
_ => {}
};
}
}
Opcode::SUB => {
if let (Operand::Register(l), Operand::Register(r)) = (instr.operand(0), instr.operand(1)) {
if l == r {
dfg.get_def(addr, Location::Register(r)).update(Data::Concrete(0, None));
}
}
},
Opcode::MOV => {
let def_site = if let Operand::Register(l) = instr.operand(0) {
if l.class() == register_class::D {
dfg.get_def(addr, Location::Register(RegSpec::q(l.num())))
} else {
dfg.get_def(addr, Location::Register(l))
}
} else {
if let Some(src) = crate::arch::x86_64::analyses::evaluators::symbolizer::referent(instr, &instr.operand(0), addr, dfg, _contexts) {
use analyses::memory_layout::MemoryAccessBaseInference;
use analyses::static_single_assignment::DFGLValue;
use crate::arch::x86_64::analyses::data_flow::ANY;
if let Some((base, addend)) = MemoryAccessBaseInference::infer_base_and_addend(&src) {
if let Some(def) = dfg.try_get_def(addr, Location::MemoryLocation(ANY, 8 , Some((Data::Expression(base), Data::Expression(addend))))) {
DFGLValue { value: def }
} else {
return;
}
} else {
return;
}
} else {
return;
}
};
match instr.operand(1) {
Operand::Register(r) => {
def_site.update(
Data::Alias(dfg.get_use(addr, Location::Register(r)).as_rc())
);
},
Operand::ImmediateI8(imm) => {
def_site.update(Data::Concrete(imm as i64 as u64, None));
}
Operand::ImmediateU8(imm) => {
def_site.update(Data::Concrete(imm as u64, None));
}
Operand::ImmediateI16(imm) => {
def_site.update(Data::Concrete(imm as i64 as u64, None));
}
Operand::ImmediateU16(imm) => {
def_site.update(Data::Concrete(imm as u64, None));
}
Operand::ImmediateI32(imm) => {
def_site.update(Data::Concrete(imm as i64 as u64, None));
}
Operand::ImmediateU32(imm) => {
def_site.update(Data::Concrete(imm as u64, None));
}
Operand::ImmediateI64(imm) => {
def_site.update(Data::Concrete(imm as u64, None));
}
Operand::ImmediateU64(imm) => {
def_site.update(Data::Concrete(imm, None));
}
_ => {}
}
},
Opcode::LEA => {
if let (Operand::Register(l), mem_op) = (instr.operand(0), instr.operand(1)) {
effective_address(instr, &mem_op, addr, dfg, _contexts).map(|ea| {
dfg.get_def(addr, Location::Register(l)).update(Data::Concrete(ea, None));
});
}
},
_ => {}
}
}
}