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A32: Detect unpredictable LDM/STM instructions

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MerryMage
2020-04-17 23:51:54 +01:00
parent cd1560c664
commit 668a43f815
5 changed files with 27 additions and 4 deletions
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13
src/frontend/A32/translate/impl/thumb16.cpp
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@@ -829,6 +829,13 @@ bool ThumbTranslatorVisitor::thumb16_BKPT([[maybe_unused]] Imm<8> imm8) {
// STM <Rn>!, <reg_list>
bool ThumbTranslatorVisitor::thumb16_STMIA(Reg n, RegList reg_list) {
if (Common::BitCount(reg_list) == 0) {
return UnpredictableInstruction();
}
if (Common::Bit(static_cast<size_t>(n), reg_list) && n != static_cast<Reg>(Common::LowestSetBit(reg_list))) {
return UnpredictableInstruction();
}
auto address = ir.GetRegister(n);
for (size_t i = 0; i < 8; i++) {
if (Common::Bit(i, reg_list)) {
@@ -842,8 +849,12 @@ bool ThumbTranslatorVisitor::thumb16_STMIA(Reg n, RegList reg_list) {
return true;
}
// STM <Rn>!, <reg_list>
// LDM <Rn>!, <reg_list>
bool ThumbTranslatorVisitor::thumb16_LDMIA(Reg n, RegList reg_list) {
if (Common::BitCount(reg_list) == 0) {
return UnpredictableInstruction();
}
const bool write_back = !Common::Bit(static_cast<size_t>(n), reg_list);
auto address = ir.GetRegister(n);