mirror of
https://github.com/lefticus/6502-cpp.git
synced 2025-02-06 14:30:11 +00:00
Implement a bunch more instructions
This commit is contained in:
Jason Turner
parent
f79a189a12
commit
d2241528e5
@ -17,6 +17,15 @@ struct C64 : Personality
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new_instructions.emplace_back(ASMLine::Type::Directive, ".byt $0B,$08,$0A,$00,$9E,$32,$30,$36,$31,$00,$00,$00");
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}
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[[nodiscard]] std::string_view stack_low_address() const override
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{
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return "$02";
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}
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[[nodiscard]] std::string_view stack_high_address() const override
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{
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return "$03";
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}
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[[nodiscard]] Operand get_register(const int reg_num) const override
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{
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switch (reg_num) {
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@ -9,6 +9,8 @@ class Personality
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public:
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virtual void insert_autostart_sequence(std::vector<mos6502> &new_instructions) const = 0;
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[[nodiscard]] virtual Operand get_register(const int reg_num) const = 0;
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[[nodiscard]] virtual std::string_view stack_low_address() const = 0;
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[[nodiscard]] virtual std::string_view stack_high_address() const= 0;
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virtual ~Personality() = default;
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Personality(const Personality &) = delete;
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157
src/6502-c++.cpp
157
src/6502-c++.cpp
@ -9,17 +9,25 @@
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#include <set>
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#include <string>
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#include <vector>
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#include <spdlog/spdlog.h>
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#include <charconv>
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#include "../include/assembly.hpp"
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#include "../include/6502.hpp"
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#include "../include/optimizer.hpp"
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#include "../include/personalities/c64.hpp"
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int parse_8bit_literal(const std::string &s)
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{
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return std::stoi(std::string(std::next(std::begin(s)), std::end(s)));
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int to_int(const std::string_view sv) {
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int result{};
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std::from_chars(sv.begin(), sv.end(), result);
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return result;
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}
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int parse_8bit_literal(const std::string_view s)
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{
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return to_int(s.substr(1));
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}
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std::string_view strip_lo_hi(std::string_view s)
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{
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@ -66,6 +74,7 @@ struct AVR : ASMLine
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unknown,
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adc,
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adiw,
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add,
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andi,
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@ -76,6 +85,7 @@ struct AVR : ASMLine
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clr,
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com,
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cp,
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cpc,
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cpi,
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cpse,
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@ -83,7 +93,10 @@ struct AVR : ASMLine
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eor,
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in,
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ld,
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ldd,
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ldi,
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lds,
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lsl,
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@ -99,12 +112,15 @@ struct AVR : ASMLine
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rjmp,
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rol,
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sbc,
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sbci,
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sbiw,
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sbrc,
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sbrs,
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st,
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std,
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sts,
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sub,
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subi,
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swap,
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};
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@ -124,9 +140,13 @@ struct AVR : ASMLine
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if (o == "rol") { return OpCode::rol; }
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if (o == "rcall") { return OpCode::rcall; }
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if (o == "ld") { return OpCode::ld; }
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if (o == "sub") { return OpCode::subi; }
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if (o == "subi") { return OpCode::subi; }
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if (o == "sbc") { return OpCode::sbci; }
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if (o == "sbci") { return OpCode::sbci; }
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if (o == "st") { return OpCode::st; }
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if (o == "std") { return OpCode::std; }
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if (o == "ldd") { return OpCode::ldd; }
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if (o == "lds") { return OpCode::lds; }
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if (o == "lsr") { return OpCode::lsr; }
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if (o == "andi") { return OpCode::andi; }
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@ -136,6 +156,7 @@ struct AVR : ASMLine
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if (o == "sbrs") { return OpCode::sbrs; }
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if (o == "brne") { return OpCode::brne; }
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if (o == "dec") { return OpCode::dec; }
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if (o == "adiw") { return OpCode::adiw; }
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if (o == "sbiw") { return OpCode::sbiw; }
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if (o == "push") { return OpCode::push; }
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if (o == "pop") { return OpCode::pop; }
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@ -148,11 +169,13 @@ struct AVR : ASMLine
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if (o == "add") { return OpCode::add; }
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if (o == "adc") { return OpCode::adc; }
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if (o == "cpc") { return OpCode::cpc; }
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if (o == "cp") { return OpCode::cp; }
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if (o == "brsh") { return OpCode::brsh; }
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if (o == "breq") { return OpCode::breq; }
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if (o == "in") { return OpCode::in; }
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}
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}
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throw std::runtime_error(fmt::format("Unknown opcode: {}"));
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throw std::runtime_error(fmt::format("Unknown opcode: {}", o));
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}
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static int get_register_number(const char reg_name)
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@ -177,7 +200,7 @@ struct AVR : ASMLine
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}
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if (o[0] == 'r' && o.size() > 1) {
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return Operand(Operand::Type::reg, atoi(&o[1]));
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return Operand(Operand::Type::reg, to_int(o.substr(1)));
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} else {
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return Operand(Operand::Type::literal, std::string{ o });
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}
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@ -196,17 +219,17 @@ struct AVR : ASMLine
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Operand operand2;
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};
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void indirect_load(std::vector<mos6502> &instructions, const std::string &from_address_low_byte, const std::string &to_address)
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void indirect_load(std::vector<mos6502> &instructions, const std::string &from_address_low_byte, const std::string &to_address, const int offset = 0)
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{
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instructions.emplace_back(mos6502::OpCode::ldy, Operand(Operand::Type::literal, "#0"));
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instructions.emplace_back(mos6502::OpCode::ldy, Operand(Operand::Type::literal, fmt::format("#{}", offset)));
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instructions.emplace_back(mos6502::OpCode::lda, Operand(Operand::Type::literal, "(" + from_address_low_byte + "), Y"));
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instructions.emplace_back(mos6502::OpCode::sta, Operand(Operand::Type::literal, to_address));
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}
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void indirect_store(std::vector<mos6502> &instructions, const std::string &from_address, const std::string &to_address_low_byte)
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void indirect_store(std::vector<mos6502> &instructions, const std::string &from_address, const std::string &to_address_low_byte, const int offset = 0)
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{
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instructions.emplace_back(mos6502::OpCode::lda, Operand(Operand::Type::literal, from_address));
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instructions.emplace_back(mos6502::OpCode::ldy, Operand(Operand::Type::literal, "#0"));
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instructions.emplace_back(mos6502::OpCode::ldy, Operand(Operand::Type::literal, fmt::format("#{}", offset)));
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instructions.emplace_back(mos6502::OpCode::sta, Operand(Operand::Type::literal, "(" + to_address_low_byte + "), Y"));
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}
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@ -232,6 +255,19 @@ void fixup_16_bit_N_Z_flags(std::vector<mos6502> &instructions)
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instructions.emplace_back(ASMLine::Type::Directive, "; END remove if next is lda");
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}
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void add_16_bit(const Personality &personality, std::vector<mos6502> &instructions, int reg, const std::uint16_t value)
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{
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//instructions.emplace_back(mos6502::OpCode::sta, Operand(Operand::Type::literal, address_low_byte));
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instructions.emplace_back(mos6502::OpCode::clc);
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instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(reg));
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instructions.emplace_back(mos6502::OpCode::adc, Operand(Operand::Type::literal, "#" + std::to_string((value & 0xFFu))));
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instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(reg));
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instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(reg + 1));
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instructions.emplace_back(mos6502::OpCode::adc, Operand(Operand::Type::literal, "#" + std::to_string((value >> 8u) & 0xFFu)));
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instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(reg + 1));
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instructions.emplace_back(mos6502::OpCode::tax);
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fixup_16_bit_N_Z_flags(instructions);
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}
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void subtract_16_bit(const Personality &personality, std::vector<mos6502> &instructions, int reg, const std::uint16_t value)
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{
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@ -312,7 +348,34 @@ void translate_instruction(const Personality &personality, std::vector<mos6502>
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increment_16_bit(personality, instructions, AVR::get_register_number(o2.value[0]));
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return;
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}
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throw std::runtime_error("Unhandled ld to non-Z");
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throw std::runtime_error("Unknown ld indexing");
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}
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case AVR::OpCode::ldd: {
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indirect_load(instructions, personality.get_register(AVR::get_register_number(o2.value[0])).value, personality.get_register(o1_reg_num).value, to_int(o2.value.substr(1)));
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return;
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}
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case AVR::OpCode::std: {
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indirect_store(instructions, personality.get_register(o2_reg_num).value, personality.get_register(AVR::get_register_number(o1.value[0])).value, to_int(o2.value.substr(1)));
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return;
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}
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case AVR::OpCode::sub: {
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// we want to utilize the carry flag, however it was set previously
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// (it's really a borrow flag on the 6502)
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instructions.emplace_back(mos6502::OpCode::clc);
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instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(o1_reg_num));
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instructions.emplace_back(mos6502::OpCode::sbc, personality.get_register(o1_reg_num));
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instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(o1_reg_num));
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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::sbc: {
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// we want to utilize the carry flag, however it was set previously
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// (it's really a borrow flag on the 6502)
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instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(o1_reg_num));
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instructions.emplace_back(mos6502::OpCode::sbc, personality.get_register(o1_reg_num));
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instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(o1_reg_num));
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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::sbci: {
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// we want to utilize the carry flag, however it was set previously
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@ -388,7 +451,7 @@ void translate_instruction(const Personality &personality, std::vector<mos6502>
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return;
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}
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case AVR::OpCode::sbrc: {
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instructions.emplace_back(mos6502::OpCode::lda, Operand(o2.type, fixup_8bit_literal("$" + std::to_string(1 << (atoi(o2.value.c_str()))))));
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instructions.emplace_back(mos6502::OpCode::lda, Operand(o2.type, fixup_8bit_literal("$" + std::to_string(1 << (to_int(o2.value))))));
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instructions.emplace_back(mos6502::OpCode::bit, personality.get_register(o1_reg_num));
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std::string new_label_name = "skip_next_instruction_" + std::to_string(instructions.size());
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instructions.emplace_back(mos6502::OpCode::beq, Operand(Operand::Type::literal, new_label_name));
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@ -396,7 +459,7 @@ void translate_instruction(const Personality &personality, std::vector<mos6502>
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return;
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}
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case AVR::OpCode::sbrs: {
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instructions.emplace_back(mos6502::OpCode::lda, Operand(o2.type, fixup_8bit_literal("$" + std::to_string(1 << (atoi(o2.value.c_str()))))));
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instructions.emplace_back(mos6502::OpCode::lda, Operand(o2.type, fixup_8bit_literal("$" + std::to_string(1 << (to_int(o2.value.c_str()))))));
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instructions.emplace_back(mos6502::OpCode::bit, personality.get_register(o1_reg_num));
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std::string new_label_name = "skip_next_instruction_" + std::to_string(instructions.size());
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instructions.emplace_back(mos6502::OpCode::bne, Operand(Operand::Type::literal, new_label_name));
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@ -418,7 +481,12 @@ void translate_instruction(const Personality &personality, std::vector<mos6502>
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}
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case AVR::OpCode::sbiw: {
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subtract_16_bit(personality, instructions, o1_reg_num, static_cast<std::uint16_t>(std::stoi(o2.value)));
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subtract_16_bit(personality, instructions, o1_reg_num, static_cast<std::uint16_t>(to_int(o2.value)));
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return;
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}
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case AVR::OpCode::adiw: {
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add_16_bit(personality, instructions, o1_reg_num, static_cast<std::uint16_t>(to_int(o2.value)));
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return;
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}
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@ -497,7 +565,12 @@ void translate_instruction(const Personality &personality, std::vector<mos6502>
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instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(o1_reg_num));
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return;
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}
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case AVR::OpCode::cp: {
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// note that this will leave the C flag in the 6502 borrow state, not normal carry state
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instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(o1_reg_num));
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instructions.emplace_back(mos6502::OpCode::cmp, personality.get_register(o2_reg_num));
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return;
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}
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case AVR::OpCode::cpc: {
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// this instruction seems to need to be used in the case after a sbc operation, where the
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// carry flag is set to the appropriate borrow state, so I'm going to not invert
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@ -522,6 +595,22 @@ void translate_instruction(const Personality &personality, std::vector<mos6502>
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}
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}
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case AVR::OpCode::in: {
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if (o2.value == "__SP_L__") {
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instructions.emplace_back(mos6502::OpCode::lda, Operand(Operand::Type::literal, std::string{personality.stack_low_address()}));
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instructions.emplace_back(mos6502::OpCode::sta, o1);
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return;
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}
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if (o2.value == "__SP_H__") {
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instructions.emplace_back(mos6502::OpCode::lda, Operand(Operand::Type::literal, std::string{ personality.stack_high_address() }));
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instructions.emplace_back(mos6502::OpCode::sta, o1);
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return;
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}
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throw std::runtime_error("Could not translate unknown 'in' instruction");
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}
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case AVR::OpCode::breq: {
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instructions.emplace_back(mos6502::OpCode::beq, o1);
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return;
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@ -534,33 +623,6 @@ void translate_instruction(const Personality &personality, std::vector<mos6502>
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throw std::runtime_error("Could not translate unhandled instruction");
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}
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enum class LogLevel {
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Warning,
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Error
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};
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std::string to_string(const LogLevel ll)
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{
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switch (ll) {
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case LogLevel::Warning:
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return "warning";
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case LogLevel::Error:
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return "error";
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}
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return "unknown";
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}
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void log(LogLevel ll, const AVR &i, const std::string &message)
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{
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std::cerr << to_string(ll) << ": " << i.line_num << ": " << message << ": `" << i.line_text << "`\n";
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}
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void log(LogLevel ll, const std::size_t line_no, const std::string &line, const std::string &message)
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{
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std::cerr << to_string(ll) << ": " << line_no << ": " << message << ": `" << line << "`\n";
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}
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void to_mos6502(const Personality &personality, const AVR &from_instruction, std::vector<mos6502> &instructions)
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{
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try {
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@ -606,7 +668,7 @@ void to_mos6502(const Personality &personality, const AVR &from_instruction, std
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translate_instruction(personality, instructions, from_instruction.opcode, from_instruction.operand1, from_instruction.operand2);
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} catch (const std::exception &e) {
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instructions.emplace_back(ASMLine::Type::Directive, "; Unhandled opcode: '" + from_instruction.text + "' " + e.what());
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log(LogLevel::Error, from_instruction, e.what());
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spdlog::error("[{}]: Unhandled instruction: '{}': {}", from_instruction.line_num, from_instruction.line_text, e.what());
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}
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auto text = from_instruction.line_text;
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@ -619,7 +681,7 @@ void to_mos6502(const Personality &personality, const AVR &from_instruction, std
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return;
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}
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} catch (const std::exception &e) {
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log(LogLevel::Error, from_instruction, e.what());
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spdlog::error("[{}]: Unhandled instruction: '{}': {}", from_instruction.line_num, from_instruction.line_text, e.what());
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}
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}
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@ -737,7 +799,7 @@ void run(const Personality &personality, std::istream &input)
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// skip empty lines
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}
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} catch (const std::exception &e) {
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log(LogLevel::Error, lineno, line, e.what());
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spdlog::error("[{}]: parse exception with '{}': {}", lineno, line, e.what());
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}
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++lineno;
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@ -789,7 +851,12 @@ void run(const Personality &personality, std::istream &input)
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if (i.text == "0") {
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i.text = "-memcpy_0";
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} else {
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i.text = new_labels.at(i.text);
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try {
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i.text = new_labels.at(i.text);
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} catch (...) {
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spdlog::error("Error looking up label name: '{}'", i.text);
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throw;
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}
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}
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}
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