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A32/translate: Add TranslateSingleInstruction

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This commit is contained in:
MerryMage 2018-08-11 18:14:00 +01:00
parent 5fc197c564
commit d345220251
4 changed files with 84 additions and 13 deletions
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47
src/frontend/A32/translate/translate_thumb.cpp
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@ -851,13 +851,17 @@ enum class ThumbInstSize {
Thumb16, Thumb32
};
bool IsThumb16(u16 first_part) {
return (first_part & 0xF800) <= 0xE800;
}
std::tuple<u32, ThumbInstSize> ReadThumbInstruction(u32 arm_pc, MemoryReadCodeFuncType memory_read_code) {
u32 first_part = memory_read_code(arm_pc & 0xFFFFFFFC);
if ((arm_pc & 0x2) != 0)
first_part >>= 16;
first_part &= 0xFFFF;
if ((first_part & 0xF800) <= 0xE800) {
if (IsThumb16(static_cast<u16>(first_part))) {
// 16-bit thumb instruction
return std::make_tuple(first_part, ThumbInstSize::Thumb16);
}
@ -882,28 +886,23 @@ IR::Block TranslateThumb(LocationDescriptor descriptor, MemoryReadCodeFuncType m
bool should_continue = true;
while (should_continue) {
const u32 arm_pc = visitor.ir.current_location.PC();
u32 thumb_instruction;
ThumbInstSize inst_size;
std::tie(thumb_instruction, inst_size) = ReadThumbInstruction(arm_pc, memory_read_code);
const auto [thumb_instruction, inst_size] = ReadThumbInstruction(arm_pc, memory_read_code);
if (inst_size == ThumbInstSize::Thumb16) {
auto decoder = DecodeThumb16<ThumbTranslatorVisitor>(static_cast<u16>(thumb_instruction));
if (decoder) {
if (const auto decoder = DecodeThumb16<ThumbTranslatorVisitor>(static_cast<u16>(thumb_instruction))) {
should_continue = decoder->call(visitor, static_cast<u16>(thumb_instruction));
} else {
should_continue = visitor.thumb16_UDF();
}
} else {
auto decoder = DecodeThumb32<ThumbTranslatorVisitor>(thumb_instruction);
if (decoder) {
if (const auto decoder = DecodeThumb32<ThumbTranslatorVisitor>(thumb_instruction)) {
should_continue = decoder->call(visitor, thumb_instruction);
} else {
should_continue = visitor.thumb32_UDF();
}
}
s32 advance_pc = (inst_size == ThumbInstSize::Thumb16) ? 2 : 4;
const s32 advance_pc = (inst_size == ThumbInstSize::Thumb16) ? 2 : 4;
visitor.ir.current_location = visitor.ir.current_location.AdvancePC(advance_pc);
block.CycleCount()++;
}
@ -913,4 +912,32 @@ IR::Block TranslateThumb(LocationDescriptor descriptor, MemoryReadCodeFuncType m
return block;
}
bool TranslateSingleThumbInstruction(IR::Block& block, LocationDescriptor descriptor, u32 thumb_instruction) {
ThumbTranslatorVisitor visitor{block, descriptor};
const bool is_thumb_16 = IsThumb16(static_cast<u16>(thumb_instruction));
bool should_continue = true;
if (is_thumb_16) {
if (const auto decoder = DecodeThumb16<ThumbTranslatorVisitor>(static_cast<u16>(thumb_instruction))) {
should_continue = decoder->call(visitor, static_cast<u16>(thumb_instruction));
} else {
should_continue = visitor.thumb16_UDF();
}
} else {
if (const auto decoder = DecodeThumb32<ThumbTranslatorVisitor>(thumb_instruction)) {
should_continue = decoder->call(visitor, thumb_instruction);
} else {
should_continue = visitor.thumb32_UDF();
}
}
const s32 advance_pc = is_thumb_16 ? 2 : 4;
visitor.ir.current_location = visitor.ir.current_location.AdvancePC(advance_pc);
block.CycleCount()++;
block.SetEndLocation(visitor.ir.current_location);
return should_continue;
}
} // namepsace Dynarmic::A32