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https://github.com/bsnes-emu/bsnes.git
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310ff4fa3b
byuu says: This WIP does substantially better on endrift's GBA timing tests. Still not perfect, though. But hopefully enough to get me out of dead last place. I also finally fixed the THUMB-mode ldmia bug that jchadwick reported. So, GBA emulation should be improved quite a bit, hopefully.
82 lines
1.8 KiB
C++
82 lines
1.8 KiB
C++
#include <processor/processor.hpp>
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#include "arm.hpp"
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namespace Processor {
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#include "registers.cpp"
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#include "algorithms.cpp"
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#include "instructions-arm.cpp"
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#include "instructions-thumb.cpp"
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#include "step.cpp"
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#include "disassembler.cpp"
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#include "serialization.cpp"
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auto ARM::power() -> void {
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processor.power();
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vector(0x00000000, Processor::Mode::SVC);
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pipeline.reload = true;
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crash = false;
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r(15).modify = [&] {
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pipeline.reload = true;
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};
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trace = false;
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instructions = 0;
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}
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auto ARM::exec() -> void {
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cpsr().t ? thumb_step() : arm_step();
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}
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auto ARM::idle() -> void {
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bus_idle(r(15));
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}
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auto ARM::read(uint32 addr, uint32 size) -> uint32 {
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uint32 word = bus_read(addr, size);
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sequential() = true;
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return word;
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}
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auto ARM::load(uint32 addr, uint32 size) -> uint32 {
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sequential() = false;
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uint32 word = read(addr, size);
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if(size == Half) { word &= 0xffff; word |= word << 16; }
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if(size == Byte) { word &= 0xff; word |= word << 8; word |= word << 16; }
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word = ror(word, 8 * (addr & 3));
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idle();
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if(size == Half) word &= 0xffff;
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if(size == Byte) word &= 0xff;
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return word;
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}
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auto ARM::write(uint32 addr, uint32 size, uint32 word) -> void {
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bus_write(addr, size, word);
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sequential() = true;
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}
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auto ARM::store(uint32 addr, uint32 size, uint32 word) -> void {
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if(size == Half) { word &= 0xffff; word |= word << 16; }
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if(size == Byte) { word &= 0xff; word |= word << 8; word |= word << 16; }
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sequential() = false;
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write(addr, size, word);
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sequential() = false;
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}
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auto ARM::vector(uint32 addr, Processor::Mode mode) -> void {
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auto psr = cpsr();
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processor.setMode(mode);
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spsr() = psr;
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cpsr().i = 1;
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cpsr().f |= mode == Processor::Mode::FIQ;
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cpsr().t = 0;
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r(14) = pipeline.decode.address;
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r(15) = addr;
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}
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}
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