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thumb32: Implement STRB immediate variants

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This commit is contained in:
Lioncash 2021-03-12 13:16:52 -05:00
parent 2093d2b775
commit cbf9027278
3 changed files with 82 additions and 4 deletions
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8
src/frontend/A32/decoder/thumb32.inc
View file

@ -124,10 +124,10 @@ INST(thumb32_UDF, "Invalid decoding", "11110-111-------10-0--
INST(thumb32_B_cond, "B (cond)", "11110Sccccvvvvvv10i0ivvvvvvvvvvv")
// Store Single Data Item
//INST(thumb32_STRB_imm_1, "STRB (imm)", "111110000000--------1--1--------")
//INST(thumb32_STRB_imm_2, "STRB (imm)", "111110000000--------1100--------")
//INST(thumb32_STRB_imm_3, "STRB (imm)", "111110001000--------------------")
//INST(thumb32_STRBT, "STRBT", "111110000000--------1110--------")
INST(thumb32_STRB_imm_1, "STRB (imm)", "111110000000nnnntttt1PU1iiiiiiii")
INST(thumb32_STRB_imm_2, "STRB (imm)", "111110000000nnnntttt1100iiiiiiii")
INST(thumb32_STRB_imm_3, "STRB (imm)", "111110001000nnnnttttiiiiiiiiiiii")
INST(thumb32_STRBT, "STRBT", "111110000000nnnntttt1110iiiiiiii")
INST(thumb32_STRB, "STRB (reg)", "111110000000nnnntttt000000iimmmm")
//INST(thumb32_STRH_imm_1, "STRH (imm)", "111110000010--------1--1--------")
//INST(thumb32_STRH_imm_2, "STRH (imm)", "111110000010--------1100--------")

74
src/frontend/A32/translate/impl/thumb32_store_single_data_item.cpp
View file

@ -29,6 +29,80 @@ static bool StoreRegister(ThumbTranslatorVisitor& v, Reg n, Reg t, Imm<2> imm2,
return true;
}
static bool StoreByteImmediate(ThumbTranslatorVisitor& v, Reg n, Reg t, bool P, bool U, bool W, Imm<8> imm8) {
const auto imm32 = imm8.ZeroExtend();
const auto reg_n = v.ir.GetRegister(n);
const auto reg_t = v.ir.GetRegister(t);
const IR::U32 offset_address = U ? v.ir.Add(reg_n, v.ir.Imm32(imm32))
: v.ir.Sub(reg_n, v.ir.Imm32(imm32));
const IR::U32 address = P ? offset_address
: reg_n;
const IR::U8 data = v.ir.LeastSignificantByte(reg_t);
v.ir.WriteMemory8(address, data);
if (W) {
v.ir.SetRegister(n, offset_address);
}
return true;
}
bool ThumbTranslatorVisitor::thumb32_STRB_imm_1(Reg n, Reg t, bool P, bool U, Imm<8> imm8) {
if (n == Reg::PC) {
return UndefinedInstruction();
}
if (t == Reg::PC || n == t) {
return UnpredictableInstruction();
}
return StoreByteImmediate(*this, n, t, P, U, true, imm8);
}
bool ThumbTranslatorVisitor::thumb32_STRB_imm_2(Reg n, Reg t, Imm<8> imm8) {
if (n == Reg::PC) {
return UndefinedInstruction();
}
if (t == Reg::PC) {
return UnpredictableInstruction();
}
return StoreByteImmediate(*this, n, t, true, false, false, imm8);
}
bool ThumbTranslatorVisitor::thumb32_STRB_imm_3(Reg n, Reg t, Imm<12> imm12) {
if (n == Reg::PC) {
return UndefinedInstruction();
}
if (t == Reg::PC) {
return UnpredictableInstruction();
}
const auto imm32 = imm12.ZeroExtend();
const auto reg_n = ir.GetRegister(n);
const auto reg_t = ir.GetRegister(t);
const auto address = ir.Add(reg_n, ir.Imm32(imm32));
const auto data = ir.LeastSignificantByte(reg_t);
ir.WriteMemory8(address, data);
return true;
}
bool ThumbTranslatorVisitor::thumb32_STRBT(Reg n, Reg t, Imm<8> imm8) {
// TODO: Add an unpredictable instruction path if this
// is executed in hypervisor mode if we ever support
// privileged execution levels.
if (n == Reg::PC) {
return UndefinedInstruction();
}
if (t == Reg::PC) {
return UnpredictableInstruction();
}
// Treat this as a normal STRB, given we don't support
// execution levels other than EL0 currently.
return StoreByteImmediate(*this, n, t, true, true, false, imm8);
}
bool ThumbTranslatorVisitor::thumb32_STRB(Reg n, Reg t, Imm<2> imm2, Reg m) {
return StoreRegister(*this, n, t, imm2, m, [this](const IR::U32& offset_address, const IR::U32& data) {
ir.WriteMemory8(offset_address, ir.LeastSignificantByte(data));

4
src/frontend/A32/translate/impl/translate_thumb.h
View file

@ -243,6 +243,10 @@ struct ThumbTranslatorVisitor final {
bool thumb32_B_cond(Imm<1> S, Cond cond, Imm<6> hi, Imm<1> j1, Imm<1> j2, Imm<11> lo);
// thumb32 store single data item instructions
bool thumb32_STRB_imm_1(Reg n, Reg t, bool P, bool U, Imm<8> imm8);
bool thumb32_STRB_imm_2(Reg n, Reg t, Imm<8> imm8);
bool thumb32_STRB_imm_3(Reg n, Reg t, Imm<12> imm12);
bool thumb32_STRBT(Reg n, Reg t, Imm<8> imm8);
bool thumb32_STRB(Reg n, Reg t, Imm<2> imm2, Reg m);
bool thumb32_STRH(Reg n, Reg t, Imm<2> imm2, Reg m);
bool thumb32_STR_reg(Reg n, Reg t, Imm<2> imm2, Reg m);