mirror of
https://github.com/lefticus/6502-cpp.git
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Add icall, inc, and fix up some assembly parsing
This commit is contained in:
Jason Turner
parent
e7a3db9dda
commit
ac8895120f
@ -1,7 +1,7 @@
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AccessModifierOffset: -2
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AlignAfterOpenBracket: DontAlign
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AlignConsecutiveAssignments: None
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AlignConsecutiveDeclarations: Consecutive
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AlignConsecutiveAssignments: false
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AlignConsecutiveDeclarations: false
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AlignEscapedNewlines: Left
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AlignOperands: true
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AlignTrailingComments: false
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@ -79,7 +79,7 @@ ObjCSpaceAfterProperty: true
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ObjCSpaceBeforeProtocolList: false
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PointerAlignment: Right
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ReflowComments: true
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SortIncludes: CaseInsensitive
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SortIncludes: true
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SortUsingDeclarations: false
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SpaceAfterCStyleCast: false
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SpaceAfterTemplateKeyword: false
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@ -21,38 +21,38 @@ struct C64 : Personality
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{
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switch (reg_num) {
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// http://sta.c64.org/cbm64mem.html
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case 0: return Operand(Operand::Type::literal, "$a7");// bit buffer for rs232
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case 1: return Operand(Operand::Type::literal, "$a8");// counter for rs232
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case 2: return Operand(Operand::Type::literal, "$05");// unused, int->fp routine pointer
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case 3: return Operand(Operand::Type::literal, "$06");
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case 4: return Operand(Operand::Type::literal, "$fb");// unused
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case 5: return Operand(Operand::Type::literal, "$fc");// unused
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case 6: return Operand(Operand::Type::literal, "$fd");// unused
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case 7: return Operand(Operand::Type::literal, "$fe");// unused
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case 8: return Operand(Operand::Type::literal, "$22");// unused
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case 9: return Operand(Operand::Type::literal, "$23");// unused
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case 10: return Operand(Operand::Type::literal, "$39");// Current BASIC line number
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case 11: return Operand(Operand::Type::literal, "$3a");// Current BASIC line number
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case 12: return Operand(Operand::Type::literal, "$61");// arithmetic register #1
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case 13: return Operand(Operand::Type::literal, "$62");
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case 14: return Operand(Operand::Type::literal, "$63");
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case 15: return Operand(Operand::Type::literal, "$64");
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case 16: return Operand(Operand::Type::literal, "$65");
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case 17: return Operand(Operand::Type::literal, "$69");// arithmetic register #2
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case 18: return Operand(Operand::Type::literal, "$6a");
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case 19: return Operand(Operand::Type::literal, "$6b");
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case 20: return Operand(Operand::Type::literal, "$6c");
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case 21: return Operand(Operand::Type::literal, "$6d");
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case 22: return Operand(Operand::Type::literal, "$57");// arithmetic register #3
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case 23: return Operand(Operand::Type::literal, "$58");
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case 24: return Operand(Operand::Type::literal, "$59");
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case 25: return Operand(Operand::Type::literal, "$5a");
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case 26: return Operand(Operand::Type::literal, "$5b");
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case 27: return Operand(Operand::Type::literal, "$5c");// arithmetic register #4
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case 28: return Operand(Operand::Type::literal, "$5d");
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case 29: return Operand(Operand::Type::literal, "$5e");
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case 30: return Operand(Operand::Type::literal, "$5f");
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case 31: return Operand(Operand::Type::literal, "$60");
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case 0: return Operand(Operand::Type::literal, "$4e");// unused, int->fp routine pointer
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case 1: return Operand(Operand::Type::literal, "$4f");
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case 2: return Operand(Operand::Type::literal, "$50");// unused
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case 3: return Operand(Operand::Type::literal, "$51");// unused
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case 4: return Operand(Operand::Type::literal, "$52");// bit buffer for rs232
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case 5: return Operand(Operand::Type::literal, "$53");// counter for rs232
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case 6: return Operand(Operand::Type::literal, "$54");// unused
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case 7: return Operand(Operand::Type::literal, "$55");// unused
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case 8: return Operand(Operand::Type::literal, "$56");// unused
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case 9: return Operand(Operand::Type::literal, "$57");// unused
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case 10: return Operand(Operand::Type::literal, "$58");// Current BASIC line number
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case 11: return Operand(Operand::Type::literal, "$59");// Current BASIC line number
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case 12: return Operand(Operand::Type::literal, "$5a");// arithmetic register #3
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case 13: return Operand(Operand::Type::literal, "$5b");
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case 14: return Operand(Operand::Type::literal, "$5c");
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case 15: return Operand(Operand::Type::literal, "$5d");
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case 16: return Operand(Operand::Type::literal, "$5e");
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case 17: return Operand(Operand::Type::literal, "$5f");
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case 18: return Operand(Operand::Type::literal, "$60");
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case 19: return Operand(Operand::Type::literal, "$61");
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case 20: return Operand(Operand::Type::literal, "$62");
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case 21: return Operand(Operand::Type::literal, "$63");
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case 22: return Operand(Operand::Type::literal, "$64");
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case 23: return Operand(Operand::Type::literal, "$65");
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case 24: return Operand(Operand::Type::literal, "$66");
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case 25: return Operand(Operand::Type::literal, "$67");
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case 26: return Operand(Operand::Type::literal, "$68");
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case 27: return Operand(Operand::Type::literal, "$69");
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case 28: return Operand(Operand::Type::literal, "$6a");
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case 29: return Operand(Operand::Type::literal, "$6b");
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case 30: return Operand(Operand::Type::literal, "$6c");
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case 31: return Operand(Operand::Type::literal, "$6d");
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}
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throw std::runtime_error("Unhandled register number: " + std::to_string(reg_num));
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}
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@ -48,6 +48,17 @@ std::string_view strip_negate(std::string_view s)
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}
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std::string_view strip_offset(std::string_view s)
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{
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const auto matcher = ctre::match<R"(^(.*)(\+|-)[0-9]+$)">;
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if (const auto results = matcher(s); results) { return results.get<1>(); }
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return s;
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}
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std::string fixup_8bit_literal(const std::string &s)
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{
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if (s[0] == '$') { return "#" + std::to_string(static_cast<uint8_t>(parse_8bit_literal(s))); }
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@ -92,6 +103,8 @@ struct AVR : ASMLine
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eor,
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in,
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inc,
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icall,
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ld,
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ldd,
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@ -140,6 +153,7 @@ struct AVR : ASMLine
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if (o == "rol") { return OpCode::rol; }
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if (o == "ror") { return OpCode::ror; }
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if (o == "rcall") { return OpCode::rcall; }
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if (o == "icall") { return OpCode::icall; }
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if (o == "call") { return OpCode::call; }
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if (o == "ld") { return OpCode::ld; }
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if (o == "sub") { return OpCode::sub; }
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@ -176,6 +190,7 @@ struct AVR : ASMLine
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if (o == "breq") { return OpCode::breq; }
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if (o == "in") { return OpCode::in; }
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if (o == "out") { return OpCode::out; }
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if (o == "inc") { return OpCode::inc; }
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}
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}
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throw std::runtime_error(fmt::format("Unknown opcode: {}", o));
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@ -251,7 +266,7 @@ void fixup_16_bit_N_Z_flags(std::vector<mos6502> &instructions)
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instructions.emplace_back(mos6502::OpCode::bmi, Operand(Operand::Type::literal, set_flag_label));
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// if it's not 0, then branch down, we know the result is not 0 and not negative
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instructions.emplace_back(mos6502::OpCode::bne, Operand(Operand::Type::literal, set_flag_label));
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// if the higher order byte is 0, test the lower order byte, which was saved for us in Y
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// if the higher order byte is 0, test the lower order byte, which was saved for us in X
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instructions.emplace_back(mos6502::OpCode::txa);
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// if low order is not negative, we know it's 0 or not 0
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instructions.emplace_back(mos6502::OpCode::bpl, Operand(Operand::Type::literal, set_flag_label));
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@ -351,6 +366,17 @@ void translate_instruction(const Personality &personality,
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return;
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}
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throw std::runtime_error("Unhandled call");
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case AVR::OpCode::icall:
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{
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std::string new_label_name = "return_from_icall_" + std::to_string(instructions.size());
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instructions.emplace_back(mos6502::OpCode::lda, Operand(Operand::Type::literal, fmt::format("#>({}-1)", new_label_name)));
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instructions.emplace_back(mos6502::OpCode::pha);
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instructions.emplace_back(mos6502::OpCode::lda, Operand(Operand::Type::literal, fmt::format("#<({}-1)", new_label_name)));
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instructions.emplace_back(mos6502::OpCode::pha);
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instructions.emplace_back(mos6502::OpCode::jmp, Operand(Operand::Type::literal, "(" + personality.get_register(AVR::get_register_number('Z')).value + ")"));
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instructions.emplace_back(ASMLine::Type::Label, new_label_name);
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return;
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}
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case AVR::OpCode::rcall:
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if (o1.value != ".") {
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instructions.emplace_back(mos6502::OpCode::jsr, o1);
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@ -426,6 +452,10 @@ void translate_instruction(const Personality &personality,
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fixup_16_bit_N_Z_flags(instructions);
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return;
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}
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case AVR::OpCode::inc:
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instructions.emplace_back(mos6502::OpCode::inc, personality.get_register(o1_reg_num));
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return;
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case AVR::OpCode::subi: {
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// to do: deal with Carry bit (and other flags) nonsense from AVR
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// if |x| < |y| -> x-y +carry
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@ -719,8 +749,19 @@ void to_mos6502(const Personality &personality, const AVR &from_instruction, std
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case ASMLine::Type::Directive:
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if (from_instruction.text.starts_with(".string")) {
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instructions.emplace_back(ASMLine::Type::Directive, ".asc " + from_instruction.text.substr(7));
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} else if (from_instruction.text.starts_with(".word")) {
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const auto matcher = ctre::match<R"(\s*.word\s*gs\((.*)\))">;
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if (const auto results = matcher(from_instruction.text); results) {
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const auto matched_gs = results.get<1>().to_string();
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instructions.emplace_back(ASMLine::Type::Directive, ".word " + matched_gs);
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} else {
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spdlog::warn("Unknown .word directive");
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}
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} else if (from_instruction.text.starts_with(".byte")) {
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instructions.emplace_back(ASMLine::Type::Directive, ".byt " + from_instruction.text.substr(5));
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instructions.emplace_back(ASMLine::Type::Directive, ".byt <" + from_instruction.text.substr(6));
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} else if (from_instruction.text.starts_with(".zero")) {
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const auto count = std::stoull(&*std::next(from_instruction.text.begin(), 6), nullptr, 10);
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@ -866,16 +907,24 @@ std::vector<mos6502> run(const Personality &personality, std::istream &input)
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std::set<std::string> used_labels{ "main", "__udivmodhi4", "__mulhi3" };
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for (const auto &i : instructions) {
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if (i.type == ASMLine::Type::Instruction) {
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const auto check_label = [&](const std::string &value) {
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if (labels.count(value) != 0) { used_labels.insert(value); }
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};
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const auto check_label = [&](const std::string &value) {
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if (labels.count(value) != 0) { used_labels.insert(value); }
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};
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if (i.type == ASMLine::Type::Instruction) {
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check_label(i.operand1.value);
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check_label(i.operand2.value);
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check_label(std::string{ strip_negate(strip_lo_hi(i.operand1.value)) });
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check_label(std::string{ strip_negate(strip_lo_hi(i.operand2.value)) });
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check_label(std::string{ strip_offset(strip_negate(strip_lo_hi(i.operand1.value))) });
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check_label(std::string{ strip_offset(strip_negate(strip_lo_hi(i.operand2.value))) });
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} else if (i.type == ASMLine::Type::Directive) {
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const auto matcher = ctre::match<R"(\s*.word\s*gs\((.*)\))">;
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if (const auto results = matcher(i.text); results) {
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const auto matched_gs = results.get<1>().to_string();
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spdlog::trace("matched gs: '{}' from '{}'", matched_gs, i.text);
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check_label(matched_gs);
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}
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}
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}
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@ -963,9 +1012,9 @@ std::vector<mos6502> run(const Personality &personality, std::istream &input)
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}
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}
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while (optimize(new_instructions, personality)) {
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// while (optimize(new_instructions, personality)) {
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// do it however many times it takes
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}
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// }
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int branch_patch_count = 0;
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while (fix_long_branches(new_instructions, branch_patch_count)) {
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@ -979,6 +1028,7 @@ enum struct Target { C64 };
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int main(const int argc, const char **argv)
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{
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spdlog::set_level(spdlog::level::trace);
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const std::map<std::string, Target> targets{ { "C64", Target::C64 } };
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CLI::App app{ "C++ Compiler for 6502 processors" };
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@ -1009,7 +1059,7 @@ int main(const int argc, const char **argv)
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const std::string gcc_command = fmt::format(
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"avr-gcc -fverbose-asm -c -o {outfile} -S {warning_flags} -std=c++20 -mtiny-stack "
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"-mmcu={avr} -O{optimization} {include_dirs} {infile}",
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"-mmcu={avr} -O{optimization} -fno-tree-loop-vectorize {include_dirs} {infile}",
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fmt::arg("outfile", avr_output_file.generic_string()),
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fmt::arg("warning_flags", warning_flags),
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fmt::arg("avr", avr),
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