mirrors/dynarmic
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

thumb32: Implement LDMIA/LDMFD

Browse source
This commit is contained in:
Lioncash 2021-03-12 19:26:03 -05:00
parent 714ccf13dd
commit 0d887d9ecd
3 changed files with 55 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
src/frontend/A32/decoder/thumb32.inc
View file

@ -3,7 +3,7 @@
//INST(thumb32_RFE_2, "RFE", "1110100000-1--------------------")
INST(thumb32_STMIA, "STMIA/STMEA", "1110100010W0nnnn0iiiiiiiiiiiiiii")
//INST(thumb32_POP, "POP", "1110100010111101----------------")
//INST(thumb32_LDMIA, "LDMIA/LDMFD", "1110100010-1--------------------")
INST(thumb32_LDMIA, "LDMIA/LDMFD", "1110100010W1nnnniiiiiiiiiiiiiiii")
//INST(thumb32_PUSH, "PUSH", "1110100100101101----------------")
INST(thumb32_STMDB, "STMDB/STMFD", "1110100100W0nnnn0iiiiiiiiiiiiiii")
//INST(thumb32_LDMDB, "LDMDB/LDMEA", "1110100100-1--------------------")

53
src/frontend/A32/translate/impl/thumb32_load_store_multiple.cpp
View file

@ -7,6 +7,59 @@
#include "frontend/A32/translate/impl/translate_thumb.h"
namespace Dynarmic::A32 {
static bool ITBlockCheck(const A32::IREmitter& ir) {
return ir.current_location.IT().IsInITBlock() && !ir.current_location.IT().IsLastInITBlock();
}
static bool LDMHelper(A32::IREmitter& ir, bool W, Reg n, u32 list,
const IR::U32& start_address, const IR::U32& writeback_address) {
auto address = start_address;
for (size_t i = 0; i <= 14; i++) {
if (Common::Bit(i, list)) {
ir.SetRegister(static_cast<Reg>(i), ir.ReadMemory32(address));
address = ir.Add(address, ir.Imm32(4));
}
}
if (W && !Common::Bit(RegNumber(n), list)) {
ir.SetRegister(n, writeback_address);
}
if (Common::Bit<15>(list)) {
ir.UpdateUpperLocationDescriptor();
ir.LoadWritePC(ir.ReadMemory32(address));
if (n == Reg::R13) {
ir.SetTerm(IR::Term::PopRSBHint{});
} else {
ir.SetTerm(IR::Term::FastDispatchHint{});
}
return false;
}
return true;
}
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));
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();
}
const auto start_address = ir.GetRegister(n);
const auto writeback_address = ir.Add(start_address, ir.Imm32(num_regs * 4));
return LDMHelper(ir, W, n, regs_imm, start_address, writeback_address);
}
bool ThumbTranslatorVisitor::thumb32_STMIA(bool W, Reg n, Imm<15> reg_list) {
const auto regs_imm = reg_list.ZeroExtend();

1
src/frontend/A32/translate/impl/translate_thumb.h
View file

@ -172,6 +172,7 @@ struct ThumbTranslatorVisitor final {
bool thumb16_B_t2(Imm<11> imm11);
// thumb32 load/store multiple instructions
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);