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thumb32: Implement STRD

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This commit is contained in:
Lioncash 2021-03-13 14:38:37 -05:00
parent 258ca93c53
commit a74843ca17
3 changed files with 40 additions and 2 deletions
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4
src/frontend/A32/decoder/thumb32.inc
View file

@ -13,8 +13,8 @@ INST(thumb32_LDMDB, "LDMDB/LDMEA", "1110100100W1nnnniiiiii
// Load/Store Dual, Load/Store Exclusive, Table Branch
//INST(thumb32_STREX, "STREX", "111010000100--------------------")
//INST(thumb32_LDREX, "LDREX", "111010000101--------------------")
//INST(thumb32_STRD_imm_1, "STRD (imm)", "11101000-110--------------------")
//INST(thumb32_STRD_imm_2, "STRD (imm)", "11101001-1-0--------------------")
INST(thumb32_STRD_imm_1, "STRD (imm)", "11101000U110nnnnttttssssiiiiiiii")
INST(thumb32_STRD_imm_2, "STRD (imm)", "11101001U1W0nnnnttttssssiiiiiiii")
//INST(thumb32_LDRD_imm_1, "LDRD (lit)", "11101000-1111111----------------")
//INST(thumb32_LDRD_imm_2, "LDRD (lit)", "11101001-1-11111----------------")
//INST(thumb32_LDRD_imm_1, "LDRD (imm)", "11101000-111--------------------")

36
src/frontend/A32/translate/impl/thumb32_load_store_dual.cpp
View file

@ -39,6 +39,42 @@ static bool TableBranch(ThumbTranslatorVisitor& v, Reg n, Reg m, bool half) {
return false;
}
static bool StoreDual(ThumbTranslatorVisitor& v, bool P, bool U, bool W, Reg n, Reg t, Reg t2, Imm<8> imm8) {
if (W && (n == t || n == t2)) {
return v.UnpredictableInstruction();
}
if (n == Reg::PC || t == Reg::PC || t2 == Reg::PC) {
return v.UnpredictableInstruction();
}
const u32 imm = imm8.ZeroExtend() << 2;
const IR::U32 reg_n = v.ir.GetRegister(n);
const IR::U32 reg_t = v.ir.GetRegister(t);
const IR::U32 reg_t2 = v.ir.GetRegister(t2);
const IR::U32 offset_address = U ? v.ir.Add(reg_n, v.ir.Imm32(imm))
: v.ir.Sub(reg_n, v.ir.Imm32(imm));
const IR::U32 address_1 = P ? offset_address
: reg_n;
const IR::U32 address_2 = v.ir.Add(address_1, v.ir.Imm32(4));
v.ir.WriteMemory32(address_1, reg_t);
v.ir.WriteMemory32(address_2, reg_t2);
if (W) {
v.ir.SetRegister(n, offset_address);
}
return true;
}
bool ThumbTranslatorVisitor::thumb32_STRD_imm_1(bool U, Reg n, Reg t, Reg t2, Imm<8> imm8) {
return StoreDual(*this, false, U, true, n, t, t2, imm8);
}
bool ThumbTranslatorVisitor::thumb32_STRD_imm_2(bool U, bool W, Reg n, Reg t, Reg t2, Imm<8> imm8) {
return StoreDual(*this, true, U, W, n, t, t2, imm8);
}
bool ThumbTranslatorVisitor::thumb32_TBB(Reg n, Reg m) {
return TableBranch(*this, n, m, false);
}

2
src/frontend/A32/translate/impl/translate_thumb.h
View file

@ -180,6 +180,8 @@ struct ThumbTranslatorVisitor final {
bool thumb32_STMDB(bool W, Reg n, Imm<15> reg_list);
// thumb32 load/store dual, load/store exclusive, table branch instructions
bool thumb32_STRD_imm_1(bool U, Reg n, Reg t, Reg t2, Imm<8> imm8);
bool thumb32_STRD_imm_2(bool U, bool W, Reg n, Reg t, Reg t2, Imm<8> imm8);
bool thumb32_TBB(Reg n, Reg m);
bool thumb32_TBH(Reg n, Reg m);