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Move start address and make c64 auto-startable

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This commit is contained in:
Jason Turner 2021-05-06 16:49:33 -06:00
parent f0caf81299
commit 7a5926b5fd
1 changed files with 8 additions and 10 deletions
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18
src/6502-c++.cpp
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@ -1200,13 +1200,6 @@ bool fix_overwritten_flags(std::vector<mos6502> &instructions)
return false;
}
void setup_target_cpu_state([[maybe_unused]] const std::vector<AVR> &instructions, std::vector<mos6502> &new_instructions)
{
// set __zero_reg__ (reg 1 on AVR) to 0
new_instructions.emplace_back(mos6502::OpCode::lda, Operand(Operand::Type::literal, "#$00"));
new_instructions.emplace_back(mos6502::OpCode::sta, AVR::get_register(1));
}
void run(std::istream &input)
{
std::regex Comment(R"(\s*\#.*)");
@ -1320,11 +1313,16 @@ void run(std::istream &input)
}
}
constexpr static auto start_address = 0x0801;
std::vector<mos6502> new_instructions;
new_instructions.emplace_back(ASMLine::Type::Directive, ".word $1000");
new_instructions.emplace_back(ASMLine::Type::Directive, "* = $1000");
setup_target_cpu_state(instructions, new_instructions);
new_instructions.emplace_back(ASMLine::Type::Directive, ".word " + std::to_string(start_address));
new_instructions.emplace_back(ASMLine::Type::Directive, "* = " + std::to_string(start_address));
new_instructions.emplace_back(ASMLine::Type::Directive, "; jmp to start of program with BASIC");
new_instructions.emplace_back(ASMLine::Type::Directive, ".byt $0B,$08,$0A,$00,$9E,$32,$30,$36,$31,$00,$00,$00");
// set __zero_reg__ (reg 1 on AVR) to 0
new_instructions.emplace_back(mos6502::OpCode::lda, Operand(Operand::Type::literal, "#$00"));
new_instructions.emplace_back(mos6502::OpCode::sta, AVR::get_register(1));
new_instructions.emplace_back(mos6502::OpCode::jmp, Operand(Operand::Type::literal, "main"));