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Implement Thumb Instructions: STRH (imm), LDRH (imm)

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This commit is contained in:
MerryMage 2016-07-18 18:28:52 +01:00
parent f9755870bb
commit a605a43ef9
3 changed files with 30 additions and 2 deletions
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4
src/frontend/decoder/thumb16.h
View file

@ -108,8 +108,8 @@ boost::optional<const Thumb16Matcher<V>&> DecodeThumb16(u16 instruction) {
INST(&V::thumb16_LDRB_reg, "LDRB (reg)", "0101110mmmnnnttt"),
INST(&V::thumb16_LDRSH_reg, "LDRSH (reg)", "0101111mmmnnnttt"),
INST(&V::thumb16_LDR_imm_t1, "LDR (imm, T1)", "01101vvvvvnnnttt"),
//INST(&V::thumb16_STRH_imm, "STRH (imm)", "10000vvvvvnnnttt"),
//INST(&V::thumb16_LDRH_imm, "LDRH (imm)", "10001vvvvvnnnttt"),
INST(&V::thumb16_STRH_imm, "STRH (imm)", "10000vvvvvnnnttt"),
INST(&V::thumb16_LDRH_imm, "LDRH (imm)", "10001vvvvvnnnttt"),
//INST(&V::thumb16_STR_sp, "STR (SP)", "10010dddvvvvvvvv"),
//INST(&V::thumb16_LDR_sp, "LDR (SP)", "10011dddvvvvvvvv"),

10
src/frontend/disassembler/disassembler_thumb.cpp
View file

@ -264,6 +264,16 @@ public:
return Common::StringFromFormat("ldr %s, [%s, #%u]", RegStr(t), RegStr(n), imm32);
}
std::string thumb16_STRH_imm(Imm5 imm5, Reg n, Reg t) {
u32 imm32 = imm5 << 1;
return Common::StringFromFormat("strh %s, [%s, #%u]", RegStr(t), RegStr(n), imm32);
}
std::string thumb16_LDRH_imm(Imm5 imm5, Reg n, Reg t) {
u32 imm32 = imm5 << 1;
return Common::StringFromFormat("ldrh %s, [%s, #%u]", RegStr(t), RegStr(n), imm32);
}
std::string thumb16_ADR(Reg d, Imm8 imm8) {
u32 imm32 = imm8 << 2;
return Common::StringFromFormat("adr %s, +#%u", RegStr(d), imm32);

18
src/frontend/translate/translate_thumb.cpp
View file

@ -486,6 +486,24 @@ struct ThumbTranslatorVisitor final {
return true;
}
bool thumb16_STRH_imm(Imm5 imm5, Reg n, Reg t) {
u32 imm32 = imm5 << 1;
// STRH <Rt>, [<Rn>, #<imm5>]
auto address = ir.Add(ir.GetRegister(n), ir.Imm32(imm32));
auto data = ir.LeastSignificantHalf(ir.GetRegister(t));
ir.WriteMemory16(address, data);
return true;
}
bool thumb16_LDRH_imm(Imm5 imm5, Reg n, Reg t) {
u32 imm32 = imm5 << 1;
// LDRH <Rt>, [<Rn>, #<imm5>]
auto address = ir.Add(ir.GetRegister(n), ir.Imm32(imm32));
auto data = ir.ZeroExtendHalfToWord(ir.ReadMemory16(address));
ir.SetRegister(t, data);
return true;
}
bool thumb16_ADR(Reg d, Imm8 imm8) {
u32 imm32 = imm8 << 2;
// ADR <Rd>, <label>