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thumb32: Implement STRH immediate variants

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This commit is contained in:
Lioncash 2021-03-12 13:55:39 -05:00
parent cbf9027278
commit 2521314384
3 changed files with 73 additions and 20 deletions
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8
src/frontend/A32/decoder/thumb32.inc
View file

@ -129,10 +129,10 @@ INST(thumb32_STRB_imm_2, "STRB (imm)", "111110000000nnnntttt11
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--------")
//INST(thumb32_STRH_imm_3, "STRH (imm)", "111110001010--------------------")
//INST(thumb32_STRHT, "STRHT", "111110000010--------1110--------")
INST(thumb32_STRH_imm_1, "STRH (imm)", "111110000010nnnntttt1PU1iiiiiiii")
INST(thumb32_STRH_imm_2, "STRH (imm)", "111110000010nnnntttt1100iiiiiiii")
INST(thumb32_STRH_imm_3, "STRH (imm)", "111110001010nnnnttttiiiiiiiiiiii")
INST(thumb32_STRHT, "STRHT", "111110000010nnnntttt1110iiiiiiii")
INST(thumb32_STRH, "STRH (reg)", "111110000010nnnntttt000000iimmmm")
//INST(thumb32_STR_imm_1, "STR (imm)", "111110000100--------1--1--------")
//INST(thumb32_STR_imm_2, "STR (imm)", "111110000100--------1100--------")

81
src/frontend/A32/translate/impl/thumb32_store_single_data_item.cpp
View file

@ -29,8 +29,19 @@ 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();
using StoreImmFn = void (*)(ThumbTranslatorVisitor&, const IR::U32&, const IR::U32&);
static void StoreImmByteFn(ThumbTranslatorVisitor& v, const IR::U32& address, const IR::U32& data) {
v.ir.WriteMemory8(address, v.ir.LeastSignificantByte(data));
}
static void StoreImmHalfFn(ThumbTranslatorVisitor& v, const IR::U32& address, const IR::U32& data) {
v.ir.WriteMemory16(address, v.ir.LeastSignificantHalf(data));
}
static bool StoreImmediate(ThumbTranslatorVisitor& v, Reg n, Reg t, bool P, bool U, bool W, Imm<12> imm12,
StoreImmFn store_fn) {
const auto imm32 = imm12.ZeroExtend();
const auto reg_n = v.ir.GetRegister(n);
const auto reg_t = v.ir.GetRegister(t);
@ -38,9 +49,8 @@ static bool StoreByteImmediate(ThumbTranslatorVisitor& v, Reg n, Reg t, bool P,
: 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);
store_fn(v, address, reg_t);
if (W) {
v.ir.SetRegister(n, offset_address);
}
@ -55,7 +65,7 @@ bool ThumbTranslatorVisitor::thumb32_STRB_imm_1(Reg n, Reg t, bool P, bool U, Im
if (t == Reg::PC || n == t) {
return UnpredictableInstruction();
}
return StoreByteImmediate(*this, n, t, P, U, true, imm8);
return StoreImmediate(*this, n, t, P, U, true, Imm<12>{imm8.ZeroExtend()}, StoreImmByteFn);
}
bool ThumbTranslatorVisitor::thumb32_STRB_imm_2(Reg n, Reg t, Imm<8> imm8) {
@ -65,7 +75,7 @@ bool ThumbTranslatorVisitor::thumb32_STRB_imm_2(Reg n, Reg t, Imm<8> imm8) {
if (t == Reg::PC) {
return UnpredictableInstruction();
}
return StoreByteImmediate(*this, n, t, true, false, false, imm8);
return StoreImmediate(*this, n, t, true, false, false, Imm<12>{imm8.ZeroExtend()}, StoreImmByteFn);
}
bool ThumbTranslatorVisitor::thumb32_STRB_imm_3(Reg n, Reg t, Imm<12> imm12) {
@ -75,15 +85,7 @@ bool ThumbTranslatorVisitor::thumb32_STRB_imm_3(Reg n, Reg t, Imm<12> imm12) {
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;
return StoreImmediate(*this, n, t, true, true, false, imm12, StoreImmByteFn);
}
bool ThumbTranslatorVisitor::thumb32_STRBT(Reg n, Reg t, Imm<8> imm8) {
@ -100,7 +102,7 @@ bool ThumbTranslatorVisitor::thumb32_STRBT(Reg n, Reg t, Imm<8> imm8) {
// 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);
return StoreImmediate(*this, n, t, true, true, false, Imm<12>{imm8.ZeroExtend()}, StoreImmByteFn);
}
bool ThumbTranslatorVisitor::thumb32_STRB(Reg n, Reg t, Imm<2> imm2, Reg m) {
@ -109,6 +111,53 @@ bool ThumbTranslatorVisitor::thumb32_STRB(Reg n, Reg t, Imm<2> imm2, Reg m) {
});
}
bool ThumbTranslatorVisitor::thumb32_STRH_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 StoreImmediate(*this, n, t, P, U, true, Imm<12>{imm8.ZeroExtend()}, StoreImmHalfFn);
}
bool ThumbTranslatorVisitor::thumb32_STRH_imm_2(Reg n, Reg t, Imm<8> imm8) {
if (n == Reg::PC) {
return UndefinedInstruction();
}
if (t == Reg::PC) {
return UnpredictableInstruction();
}
return StoreImmediate(*this, n, t, true, false, false, Imm<12>{imm8.ZeroExtend()}, StoreImmHalfFn);
}
bool ThumbTranslatorVisitor::thumb32_STRH_imm_3(Reg n, Reg t, Imm<12> imm12) {
if (n == Reg::PC) {
return UndefinedInstruction();
}
if (t == Reg::PC) {
return UnpredictableInstruction();
}
return StoreImmediate(*this, n, t, true, true, false, imm12, StoreImmHalfFn);
}
bool ThumbTranslatorVisitor::thumb32_STRHT(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 STRH, given we don't support
// execution levels other than EL0 currently.
return StoreImmediate(*this, n, t, true, true, false, Imm<12>{imm8.ZeroExtend()}, StoreImmHalfFn);
}
bool ThumbTranslatorVisitor::thumb32_STRH(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.WriteMemory16(offset_address, ir.LeastSignificantHalf(data));

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

@ -248,6 +248,10 @@ struct ThumbTranslatorVisitor final {
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_imm_1(Reg n, Reg t, bool P, bool U, Imm<8> imm8);
bool thumb32_STRH_imm_2(Reg n, Reg t, Imm<8> imm8);
bool thumb32_STRH_imm_3(Reg n, Reg t, Imm<12> imm12);
bool thumb32_STRHT(Reg n, Reg t, Imm<8> imm8);
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);