619 lines
16 KiB
C++
619 lines
16 KiB
C++
#include <core/Interpreter.hpp>
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#include <core/registers/Registers.hpp>
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#include <log.hpp>
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namespace n64 {
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Cop0::Cop0(Registers ®s) : regs(regs) { Reset(); }
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void Cop0::Reset() {
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cause.raw = 0xB000007C;
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status.raw = 0;
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status.cu0 = 1;
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status.cu1 = 1;
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status.fr = 1;
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PRId = 0x00000B22;
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Config = 0x7006E463;
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EPC = 0xFFFFFFFFFFFFFFFFll;
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ErrorEPC = 0xFFFFFFFFFFFFFFFFll;
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wired = 0;
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index.raw = 63;
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badVaddr = 0xFFFFFFFFFFFFFFFF;
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kernelMode = {true};
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supervisorMode = {false};
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userMode = {false};
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is64BitAddressing = {false};
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llbit = {};
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pageMask = {};
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entryHi = {};
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entryLo0 = {}, entryLo1 = {};
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context = {};
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wired = {}, r7 = {};
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count = {};
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compare = {};
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LLAddr = {}, WatchLo = {}, WatchHi = {};
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xcontext = {};
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r21 = {}, r22 = {}, r23 = {}, r24 = {}, r25 = {};
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ParityError = {}, CacheError = {}, TagLo = {}, TagHi = {};
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ErrorEPC = {};
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r31 = {};
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memset(tlb, 0, sizeof(TLBEntry) * 32);
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tlbError = NONE;
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openbus = {};
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}
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u32 Cop0::GetReg32(const u8 addr) {
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switch (addr) {
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case COP0_REG_INDEX:
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return index.raw & INDEX_MASK;
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case COP0_REG_RANDOM:
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return GetRandom();
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case COP0_REG_ENTRYLO0:
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return entryLo0.raw;
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case COP0_REG_ENTRYLO1:
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return entryLo1.raw;
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case COP0_REG_CONTEXT:
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return context.raw;
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case COP0_REG_PAGEMASK:
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return pageMask.raw;
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case COP0_REG_WIRED:
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return wired;
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case COP0_REG_BADVADDR:
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return badVaddr;
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case COP0_REG_COUNT:
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return GetCount();
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case COP0_REG_ENTRYHI:
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return entryHi.raw;
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case COP0_REG_COMPARE:
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return compare;
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case COP0_REG_STATUS:
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return status.raw;
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case COP0_REG_CAUSE:
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return cause.raw;
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case COP0_REG_EPC:
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return EPC;
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case COP0_REG_PRID:
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return PRId;
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case COP0_REG_CONFIG:
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return Config;
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case COP0_REG_LLADDR:
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return LLAddr;
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case COP0_REG_WATCHLO:
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return WatchLo;
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case COP0_REG_WATCHHI:
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return WatchHi;
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case COP0_REG_XCONTEXT:
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return xcontext.raw;
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case COP0_REG_PARITY_ERR:
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return ParityError;
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case COP0_REG_CACHE_ERR:
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return CacheError;
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case COP0_REG_TAGLO:
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return TagLo;
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case COP0_REG_TAGHI:
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return TagHi;
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case COP0_REG_ERROREPC:
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return ErrorEPC;
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case 7:
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case 21:
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case 22:
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case 23:
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case 24:
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case 25:
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case 31:
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return openbus;
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default:
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Util::panic("Unsupported word read from COP0 register {}", addr);
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}
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}
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u64 Cop0::GetReg64(const u8 addr) const {
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switch (addr) {
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case COP0_REG_ENTRYLO0:
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return entryLo0.raw;
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case COP0_REG_ENTRYLO1:
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return entryLo1.raw;
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case COP0_REG_CONTEXT:
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return context.raw;
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case COP0_REG_BADVADDR:
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return badVaddr;
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case COP0_REG_ENTRYHI:
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return entryHi.raw;
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case COP0_REG_STATUS:
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return status.raw;
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case COP0_REG_EPC:
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return EPC;
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case COP0_REG_PRID:
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return PRId;
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case COP0_REG_LLADDR:
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return LLAddr;
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case COP0_REG_XCONTEXT:
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return xcontext.raw & 0xFFFFFFFFFFFFFFF0;
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case COP0_REG_ERROREPC:
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return ErrorEPC;
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case 7:
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case 21:
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case 22:
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case 23:
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case 24:
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case 25:
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case 31:
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return openbus;
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default:
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Util::panic("Unsupported dword read from COP0 register {}", addr);
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}
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}
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void Cop0::SetReg32(const u8 addr, const u32 value) {
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openbus = value & 0xFFFFFFFF;
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switch (addr) {
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case COP0_REG_INDEX:
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index.raw = value & INDEX_MASK;
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break;
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case COP0_REG_RANDOM:
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break;
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case COP0_REG_ENTRYLO0:
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entryLo0.raw = value & ENTRY_LO_MASK;
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break;
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case COP0_REG_ENTRYLO1:
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entryLo1.raw = value & ENTRY_LO_MASK;
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break;
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case COP0_REG_CONTEXT:
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context.raw = (s64(s32(value)) & 0xFFFFFFFFFF800000) | (context.raw & 0x7FFFFF);
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break;
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case COP0_REG_PAGEMASK:
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pageMask.raw = value & PAGEMASK_MASK;
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break;
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case COP0_REG_WIRED:
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wired = value & 63;
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break;
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case COP0_REG_BADVADDR:
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break;
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case COP0_REG_COUNT:
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count = (u64)value << 1;
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break;
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case COP0_REG_ENTRYHI:
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entryHi.raw = s64(s32(value)) & ENTRY_HI_MASK;
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break;
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case COP0_REG_COMPARE:
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compare = value;
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cause.ip7 = false;
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break;
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case COP0_REG_STATUS:
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status.raw &= ~STATUS_MASK;
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status.raw |= (value & STATUS_MASK);
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Update();
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break;
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case COP0_REG_CAUSE:
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{
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Cop0Cause tmp{};
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tmp.raw = value;
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cause.ip0 = tmp.ip0;
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cause.ip1 = tmp.ip1;
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}
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break;
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case COP0_REG_EPC:
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EPC = s64(s32(value));
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break;
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case COP0_REG_PRID:
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break;
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case COP0_REG_CONFIG:
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Config &= ~CONFIG_MASK;
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Config |= (value & CONFIG_MASK);
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break;
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case COP0_REG_LLADDR:
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LLAddr = value;
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break;
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case COP0_REG_WATCHLO:
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WatchLo = value;
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break;
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case COP0_REG_WATCHHI:
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WatchHi = value;
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break;
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case COP0_REG_XCONTEXT:
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xcontext.raw = (s64(s32(value)) & 0xFFFFFFFE00000000) | (xcontext.raw & 0x1FFFFFFFF);
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break;
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case COP0_REG_PARITY_ERR:
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ParityError = value & 0xff;
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break;
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case COP0_REG_CACHE_ERR:
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break;
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case COP0_REG_TAGLO:
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TagLo = value;
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break;
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case COP0_REG_TAGHI:
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TagHi = value;
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break;
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case COP0_REG_ERROREPC:
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ErrorEPC = s64(s32(value));
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break;
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case 7:
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case 21:
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case 22:
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case 23:
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case 24:
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case 25:
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case 31:
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break;
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default:
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Util::panic("Unsupported word write from COP0 register {}", addr);
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}
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}
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void Cop0::SetReg64(const u8 addr, const u64 value) {
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openbus = value;
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switch (addr) {
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case COP0_REG_ENTRYLO0:
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entryLo0.raw = value & ENTRY_LO_MASK;
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break;
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case COP0_REG_ENTRYLO1:
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entryLo1.raw = value & ENTRY_LO_MASK;
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break;
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case COP0_REG_CONTEXT:
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context.raw = (value & 0xFFFFFFFFFF800000) | (context.raw & 0x7FFFFF);
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break;
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case COP0_REG_XCONTEXT:
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xcontext.raw = (value & 0xFFFFFFFE00000000) | (xcontext.raw & 0x1FFFFFFFF);
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break;
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case COP0_REG_ENTRYHI:
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entryHi.raw = value & ENTRY_HI_MASK;
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break;
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case COP0_REG_STATUS:
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status.raw = value;
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break;
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case COP0_REG_CAUSE:
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{
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Cop0Cause tmp{};
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tmp.raw = value;
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cause.ip0 = tmp.ip0;
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cause.ip1 = tmp.ip1;
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}
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break;
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case COP0_REG_BADVADDR:
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break;
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case COP0_REG_EPC:
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EPC = (s64)value;
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break;
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case COP0_REG_LLADDR:
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LLAddr = value;
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break;
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case COP0_REG_ERROREPC:
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ErrorEPC = (s64)value;
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break;
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default:
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Util::panic("Unsupported dword write to COP0 register {}", addr);
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}
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}
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static FORCE_INLINE u64 getVPN(const u64 addr, const u64 pageMask) {
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const u64 mask = pageMask | 0x1fff;
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const u64 vpn = addr & 0xFFFFFFFFFF | addr >> 22 & 0x30000000000;
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return vpn & ~mask;
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}
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TLBEntry *Cop0::TLBTryMatch(const u64 vaddr, int &index) const {
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for (int i = 0; i < 32; i++) {
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if (TLBEntry *entry = ®s.cop0.tlb[i]; entry->initialized) {
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const u64 entry_vpn = getVPN(entry->entryHi.raw, entry->pageMask.raw);
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const u64 vaddr_vpn = getVPN(vaddr, entry->pageMask.raw);
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const bool vpn_match = entry_vpn == vaddr_vpn;
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if (const bool asid_match = entry->global || regs.cop0.entryHi.asid == entry->entryHi.asid;
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vpn_match && asid_match) {
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index = i;
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return entry;
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}
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}
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}
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return nullptr;
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}
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TLBEntry *Cop0::TLBTryMatch(const u64 vaddr) const {
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for (auto &i : regs.cop0.tlb) {
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if (TLBEntry *entry = &i; entry->initialized) {
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const u64 entry_vpn = getVPN(entry->entryHi.raw, entry->pageMask.raw);
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const u64 vaddr_vpn = getVPN(vaddr, entry->pageMask.raw);
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const bool vpn_match = entry_vpn == vaddr_vpn;
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if (const bool asid_match = entry->global || regs.cop0.entryHi.asid == entry->entryHi.asid;
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vpn_match && asid_match) {
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return entry;
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}
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}
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}
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return nullptr;
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}
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bool Cop0::ProbeTLB(const TLBAccessType accessType, const u64 vaddr, u32 &paddr) const {
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const TLBEntry *entry = TLBTryMatch(vaddr);
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if (!entry) {
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regs.cop0.tlbError = MISS;
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return false;
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}
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const u32 mask = entry->pageMask.mask << 12 | 0xFFF;
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const u32 odd = vaddr & mask + 1;
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const EntryLo entryLo = odd ? entry->entryLo1 : entry->entryLo0;
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if (!entryLo.v) {
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regs.cop0.tlbError = INVALID;
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return false;
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}
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if (accessType == STORE && !entryLo.d) {
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regs.cop0.tlbError = MODIFICATION;
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return false;
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}
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paddr = entryLo.pfn << 12 | vaddr & mask;
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return true;
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}
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FORCE_INLINE bool Is64BitAddressing(const Cop0 &cp0, const u64 addr) {
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switch (addr >> 62 & 3) {
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case 0b00:
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return cp0.status.ux;
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case 0b01:
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return cp0.status.sx;
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case 0b11:
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return cp0.status.kx;
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default:
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return false;
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}
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}
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void Cop0::FireException(const ExceptionCode code, const int cop, s64 pc) const {
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const bool old_exl = regs.cop0.status.exl;
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if (!regs.cop0.status.exl) {
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if ((regs.cop0.cause.branchDelay = regs.prevDelaySlot)) {
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pc -= 4;
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}
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regs.cop0.status.exl = true;
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regs.cop0.EPC = pc;
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}
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regs.cop0.cause.copError = cop;
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regs.cop0.cause.exceptionCode = static_cast<u8>(code);
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if (regs.cop0.status.bev) {
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Util::panic("BEV bit set!");
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} else {
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switch (code) {
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case ExceptionCode::Interrupt:
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case ExceptionCode::TLBModification:
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case ExceptionCode::AddressErrorLoad:
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case ExceptionCode::AddressErrorStore:
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case ExceptionCode::InstructionBusError:
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case ExceptionCode::DataBusError:
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case ExceptionCode::Syscall:
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case ExceptionCode::Breakpoint:
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case ExceptionCode::ReservedInstruction:
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case ExceptionCode::CoprocessorUnusable:
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case ExceptionCode::Overflow:
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case ExceptionCode::Trap:
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case ExceptionCode::FloatingPointError:
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case ExceptionCode::Watch:
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regs.SetPC32(s32(0x80000180));
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break;
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case ExceptionCode::TLBLoad:
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case ExceptionCode::TLBStore:
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if (old_exl || regs.cop0.tlbError == INVALID) {
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regs.SetPC32(s32(0x80000180));
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} else if (Is64BitAddressing(regs.cop0, regs.cop0.badVaddr)) {
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regs.SetPC32(s32(0x80000080));
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} else {
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regs.SetPC32(s32(0x80000000));
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}
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break;
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default:
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Util::panic("Unhandled exception! {}", static_cast<u8>(code));
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}
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}
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regs.cop0.Update();
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}
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void Cop0::HandleTLBException(const u64 vaddr) const {
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const u64 vpn2 = vaddr >> 13 & 0x7FFFF;
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const u64 xvpn2 = vaddr >> 13 & 0x7FFFFFF;
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regs.cop0.badVaddr = vaddr;
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regs.cop0.context.badvpn2 = vpn2;
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regs.cop0.xcontext.badvpn2 = xvpn2;
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regs.cop0.xcontext.r = vaddr >> 62 & 3;
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regs.cop0.entryHi.vpn2 = xvpn2;
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regs.cop0.entryHi.r = vaddr >> 62 & 3;
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}
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ExceptionCode Cop0::GetTLBExceptionCode(const TLBError error, const TLBAccessType accessType) {
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switch (error) {
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case NONE:
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Util::panic("Getting TLB exception with error NONE");
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case INVALID:
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case MISS:
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return accessType == LOAD ? ExceptionCode::TLBLoad : ExceptionCode::TLBStore;
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case MODIFICATION:
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return ExceptionCode::TLBModification;
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case DISALLOWED_ADDRESS:
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return accessType == LOAD ? ExceptionCode::AddressErrorLoad : ExceptionCode::AddressErrorStore;
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default:
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Util::panic("Getting TLB exception for unknown error code! ({})", static_cast<u8>(error));
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return {};
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}
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}
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void Cop0::decode(const u32 instr) {
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const u8 mask_cop = instr >> 21 & 0x1F;
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const u8 mask_cop2 = instr & 0x3F;
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switch (mask_cop) {
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case 0x00:
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mfc0(instr);
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break;
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case 0x01:
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dmfc0(instr);
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break;
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case 0x04:
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mtc0(instr);
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break;
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case 0x05:
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dmtc0(instr);
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break;
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case 0x10 ... 0x1F:
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switch (mask_cop2) {
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case 0x01:
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tlbr();
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break;
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case 0x02:
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tlbw(index.i);
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break;
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case 0x06:
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tlbw(GetRandom());
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break;
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case 0x08:
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tlbp();
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break;
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case 0x18:
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eret();
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break;
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default:
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Util::panic("Unimplemented COP0 function {} {} ({:08X}) ({:016X})", mask_cop2 >> 3, mask_cop2 & 7, instr,
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regs.oldPC);
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}
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break;
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default:
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Util::panic("Unimplemented COP0 instruction {} {}", mask_cop >> 4, mask_cop & 7);
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}
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}
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bool Cop0::MapVAddr(const TLBAccessType accessType, const u64 vaddr, u32 &paddr) {
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if (regs.cop0.is64BitAddressing) [[unlikely]] {
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if (regs.cop0.kernelMode) [[likely]] {
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return MapVAddr64(accessType, vaddr, paddr);
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}
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if (regs.cop0.userMode) {
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return UserMapVAddr64(accessType, vaddr, paddr);
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}
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if (regs.cop0.supervisorMode) {
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Util::panic("Supervisor mode memory access, 64 bit mode");
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} else {
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Util::panic("Unknown mode! This should never happen!");
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}
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} else {
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if (regs.cop0.kernelMode) [[likely]] {
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return MapVAddr32(accessType, vaddr, paddr);
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}
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if (regs.cop0.userMode) {
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return UserMapVAddr32(accessType, vaddr, paddr);
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}
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if (regs.cop0.supervisorMode) {
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Util::panic("Supervisor mode memory access, 32 bit mode");
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} else {
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Util::panic("Unknown mode! This should never happen!");
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}
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}
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}
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bool Cop0::UserMapVAddr32(const TLBAccessType accessType, const u64 vaddr, u32 &paddr) {
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switch (vaddr) {
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case VREGION_KUSEG:
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return ProbeTLB(accessType, s64(s32(vaddr)), paddr);
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default:
|
|
regs.cop0.tlbError = DISALLOWED_ADDRESS;
|
|
return false;
|
|
}
|
|
}
|
|
|
|
bool Cop0::MapVAddr32(const TLBAccessType accessType, const u64 vaddr, u32 &paddr) {
|
|
switch (static_cast<u32>(vaddr) >> 29 & 7) {
|
|
case 0 ... 3:
|
|
case 7:
|
|
return ProbeTLB(accessType, static_cast<s32>(vaddr), paddr);
|
|
case 4 ... 5:
|
|
paddr = vaddr & 0x1FFFFFFF;
|
|
return true;
|
|
case 6:
|
|
Util::panic("Unimplemented virtual mapping in KSSEG! ({:08X})", vaddr);
|
|
default:
|
|
Util::panic("Should never end up in default case in map_vaddr! ({:08X})", vaddr);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool Cop0::UserMapVAddr64(const TLBAccessType accessType, const u64 vaddr, u32 &paddr) {
|
|
switch (vaddr) {
|
|
case VREGION_XKUSEG:
|
|
return ProbeTLB(accessType, vaddr, paddr);
|
|
default:
|
|
regs.cop0.tlbError = DISALLOWED_ADDRESS;
|
|
return false;
|
|
}
|
|
}
|
|
|
|
bool Cop0::MapVAddr64(const TLBAccessType accessType, const u64 vaddr, u32 &paddr) {
|
|
switch (vaddr) {
|
|
case VREGION_XKUSEG:
|
|
case VREGION_XKSSEG:
|
|
return ProbeTLB(accessType, vaddr, paddr);
|
|
case VREGION_XKPHYS:
|
|
{
|
|
if (!regs.cop0.kernelMode) {
|
|
Util::panic("Access to XKPHYS address 0x{:016X} when outside kernel mode!", vaddr);
|
|
}
|
|
if (const u8 high_two_bits = (vaddr >> 62) & 0b11; high_two_bits != 0b10) {
|
|
Util::panic("Access to XKPHYS address 0x{:016X} with high two bits != 0b10!", vaddr);
|
|
}
|
|
const u8 subsegment = (vaddr >> 59) & 0b11;
|
|
bool cached = subsegment != 2; // do something with this eventually
|
|
// If any bits in the range of 58:32 are set, the address is invalid.
|
|
if (const bool valid = (vaddr & 0x07FFFFFF00000000) == 0; !valid) {
|
|
regs.cop0.tlbError = DISALLOWED_ADDRESS;
|
|
return false;
|
|
}
|
|
paddr = vaddr & 0xFFFFFFFF;
|
|
return true;
|
|
}
|
|
case VREGION_XKSEG:
|
|
return ProbeTLB(accessType, vaddr, paddr);
|
|
case VREGION_CKSEG0:
|
|
// Identical to kseg0 in 32 bit mode.
|
|
// Unmapped translation. Subtract the base address of the space to get the physical address.
|
|
paddr = vaddr - START_VREGION_KSEG0; // Implies cutting off the high 32 bits
|
|
Util::trace("CKSEG0: Translated 0x{:016X} to 0x{:08X}", vaddr, paddr);
|
|
return true;
|
|
case VREGION_CKSEG1:
|
|
// Identical to kseg1 in 32 bit mode.
|
|
// Unmapped translation. Subtract the base address of the space to get the physical address.
|
|
paddr = vaddr - START_VREGION_KSEG1; // Implies cutting off the high 32 bits
|
|
Util::trace("KSEG1: Translated 0x{:016X} to 0x{:08X}", vaddr, paddr);
|
|
return true;
|
|
case VREGION_CKSSEG:
|
|
Util::panic("Resolving virtual address 0x{:016X} (VREGION_CKSSEG) in 64 bit mode", vaddr);
|
|
case VREGION_CKSEG3:
|
|
return ProbeTLB(accessType, vaddr, paddr);
|
|
case VREGION_XBAD1:
|
|
case VREGION_XBAD2:
|
|
case VREGION_XBAD3:
|
|
regs.cop0.tlbError = DISALLOWED_ADDRESS;
|
|
return false;
|
|
default:
|
|
Util::panic("Resolving virtual address 0x{:016X} in 64 bit mode", vaddr);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
} // namespace n64
|