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thumb32: Implement LDMDB/LDMEA

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This commit is contained in:
Lioncash 2021-03-12 19:35:28 -05:00
parent ae83713f4f
commit 39edee70ff
3 changed files with 27 additions and 1 deletions
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2
src/frontend/A32/decoder/thumb32.inc
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@ -6,7 +6,7 @@ INST(thumb32_STMIA, "STMIA/STMEA", "1110100010W0nnnn0iiiii
INST(thumb32_LDMIA, "LDMIA/LDMFD", "1110100010W1nnnniiiiiiiiiiiiiiii")
//INST(thumb32_PUSH, "PUSH", "1110100100101101----------------")
INST(thumb32_STMDB, "STMDB/STMFD", "1110100100W0nnnn0iiiiiiiiiiiiiii")
//INST(thumb32_LDMDB, "LDMDB/LDMEA", "1110100100-1--------------------")
INST(thumb32_LDMDB, "LDMDB/LDMEA", "1110100100W1nnnniiiiiiiiiiiiiiii")
//INST(thumb32_SRS_1, "SRS", "1110100110-0--------------------")
//INST(thumb32_RFE_2, "RFE", "1110100110-1--------------------")

25
src/frontend/A32/translate/impl/thumb32_load_store_multiple.cpp
View file

@ -51,6 +51,31 @@ static bool STMHelper(A32::IREmitter& ir, bool W, Reg n, u32 list,
return true;
}
bool ThumbTranslatorVisitor::thumb32_LDMDB(bool W, Reg n, Imm<16> reg_list) {
const auto regs_imm = reg_list.ZeroExtend();
const auto num_regs = static_cast<u32>(Common::BitCount(regs_imm));
if (n == Reg::PC || num_regs < 2) {
return UnpredictableInstruction();
}
if (reg_list.Bit<15>() && reg_list.Bit<14>()) {
return UnpredictableInstruction();
}
if (W && Common::Bit(static_cast<size_t>(n), regs_imm)) {
return UnpredictableInstruction();
}
if (reg_list.Bit<13>()) {
return UnpredictableInstruction();
}
if (reg_list.Bit<15>() && ITBlockCheck(ir)) {
return UnpredictableInstruction();
}
// Start address is the same as the writeback address.
const IR::U32 start_address = ir.Sub(ir.GetRegister(n), ir.Imm32(4 * num_regs));
return LDMHelper(ir, W, n, regs_imm, start_address, start_address);
}
bool ThumbTranslatorVisitor::thumb32_LDMIA(bool W, Reg n, Imm<16> reg_list) {
const auto regs_imm = reg_list.ZeroExtend();
const auto num_regs = static_cast<u32>(Common::BitCount(regs_imm));

1
src/frontend/A32/translate/impl/translate_thumb.h
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@ -172,6 +172,7 @@ struct ThumbTranslatorVisitor final {
bool thumb16_B_t2(Imm<11> imm11);
// thumb32 load/store multiple instructions
bool thumb32_LDMDB(bool W, Reg n, Imm<16> reg_list);
bool thumb32_LDMIA(bool W, Reg n, Imm<16> reg_list);
bool thumb32_STMIA(bool W, Reg n, Imm<15> reg_list);
bool thumb32_STMDB(bool W, Reg n, Imm<15> reg_list);