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thumb32: Implement SXTB

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This commit is contained in:
Lioncash 2021-02-10 16:18:26 -05:00
parent 3cefdc3ab9
commit 75a28b00a7
3 changed files with 14 additions and 1 deletions
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2
src/frontend/A32/decoder/thumb32.inc
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@ -203,7 +203,7 @@ INST(thumb32_SXTB16, "SXTB16", "11111010001011111111dd
INST(thumb32_SXTAB16, "SXTAB16", "111110100010nnnn1111dddd10rrmmmm")
INST(thumb32_UXTB16, "UXTB16", "11111010001111111111dddd10rrmmmm")
INST(thumb32_UXTAB16, "UXTAB16", "111110100011nnnn1111dddd10rrmmmm")
//INST(thumb32_SXTB, "SXTB", "11111010010011111111----1-------")
INST(thumb32_SXTB, "SXTB", "11111010010011111111dddd10rrmmmm")
//INST(thumb32_SXTAB, "SXTAB", "111110100100----1111----1-------")
//INST(thumb32_UXTB, "UXTB", "11111010010111111111----1-------")
//INST(thumb32_UXTAB, "UXTAB", "111110100101----1111----1-------")

12
src/frontend/A32/translate/impl/thumb32_data_processing_register.cpp
View file

@ -11,6 +11,18 @@ static IR::U32 Rotate(A32::IREmitter& ir, Reg m, SignExtendRotation rotate) {
return ir.RotateRight(ir.GetRegister(m), ir.Imm8(rotate_by), ir.Imm1(0)).result;
}
bool ThumbTranslatorVisitor::thumb32_SXTB(Reg d, SignExtendRotation rotate, Reg m) {
if (d == Reg::PC || m == Reg::PC) {
return UnpredictableInstruction();
}
const auto rotated = Rotate(ir, m, rotate);
const auto result = ir.SignExtendByteToWord(ir.LeastSignificantByte(rotated));
ir.SetRegister(d, result);
return true;
}
bool ThumbTranslatorVisitor::thumb32_SXTB16(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

@ -122,6 +122,7 @@ struct ThumbTranslatorVisitor final {
bool thumb32_UDF();
// 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_SXTAB16(Reg n, Reg d, SignExtendRotation rotate, Reg m);
bool thumb32_SXTH(Reg d, SignExtendRotation rotate, Reg m);