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thumb32: Implement SXTAB

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This commit is contained in:
Lioncash 2021-02-10 16:20:43 -05:00
parent 75a28b00a7
commit ad5d0d7b77
3 changed files with 15 additions and 1 deletions
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2
src/frontend/A32/decoder/thumb32.inc
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@ -204,7 +204,7 @@ INST(thumb32_SXTAB16, "SXTAB16", "111110100010nnnn1111dd
INST(thumb32_UXTB16, "UXTB16", "11111010001111111111dddd10rrmmmm")
INST(thumb32_UXTAB16, "UXTAB16", "111110100011nnnn1111dddd10rrmmmm")
INST(thumb32_SXTB, "SXTB", "11111010010011111111dddd10rrmmmm")
//INST(thumb32_SXTAB, "SXTAB", "111110100100----1111----1-------")
INST(thumb32_SXTAB, "SXTAB", "111110100100nnnn1111dddd10rrmmmm")
//INST(thumb32_UXTB, "UXTB", "11111010010111111111----1-------")
//INST(thumb32_UXTAB, "UXTAB", "111110100101----1111----1-------")

13
src/frontend/A32/translate/impl/thumb32_data_processing_register.cpp
View file

@ -37,6 +37,19 @@ bool ThumbTranslatorVisitor::thumb32_SXTB16(Reg d, SignExtendRotation rotate, Re
return true;
}
bool ThumbTranslatorVisitor::thumb32_SXTAB(Reg n, Reg d, SignExtendRotation rotate, Reg m) {
if (d == Reg::PC || m == Reg::PC) {
return UnpredictableInstruction();
}
const auto rotated = Rotate(ir, m, rotate);
const auto reg_n = ir.GetRegister(n);
const auto result = ir.Add(reg_n, ir.SignExtendByteToWord(ir.LeastSignificantByte(rotated)));
ir.SetRegister(d, result);
return true;
}
bool ThumbTranslatorVisitor::thumb32_SXTAB16(Reg n, Reg d, SignExtendRotation rotate, Reg m) {
if (d == Reg::PC || m == Reg::PC) {
return UnpredictableInstruction();

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

@ -124,6 +124,7 @@ struct ThumbTranslatorVisitor final {
// thumb32 data processing (register) instructions
bool thumb32_SXTB(Reg d, SignExtendRotation rotate, Reg m);
bool thumb32_SXTB16(Reg d, SignExtendRotation rotate, Reg m);
bool thumb32_SXTAB(Reg n, Reg d, SignExtendRotation rotate, Reg m);
bool thumb32_SXTAB16(Reg n, Reg d, SignExtendRotation rotate, Reg m);
bool thumb32_SXTH(Reg d, SignExtendRotation rotate, Reg m);
bool thumb32_SXTAH(Reg n, Reg d, SignExtendRotation rotate, Reg m);