147 lines
4.4 KiB
C
147 lines
4.4 KiB
C
/*
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* Project 64 - A Nintendo 64 emulator.
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*
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* (c) Copyright 2001 zilmar (zilmar@emulation64.com) and
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* Jabo (jabo@emulation64.com).
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*
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* pj64 homepage: www.pj64.net
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*
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* Permission to use, copy, modify and distribute Project64 in both binary and
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* source form, for non-commercial purposes, is hereby granted without fee,
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* providing that this license information and copyright notice appear with
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* all copies and any derived work.
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event shall the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Project64 is freeware for PERSONAL USE only. Commercial users should
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* seek permission of the copyright holders first. Commercial use includes
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* charging money for Project64 or software derived from Project64.
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*
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* The copyright holders request that bug fixes and improvements to the code
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* should be forwarded to them so if they want them.
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*
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*/
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#include "main.h"
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#include "cpu.h"
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#include "usf_internal.h"
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void CheckInterrupts ( usf_state_t * state ) {
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MI_INTR_REG &= ~MI_INTR_AI;
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MI_INTR_REG |= (state->AudioIntrReg & MI_INTR_AI);
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if ((MI_INTR_MASK_REG & MI_INTR_REG) != 0) {
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FAKE_CAUSE_REGISTER |= CAUSE_IP2;
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} else {
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FAKE_CAUSE_REGISTER &= ~CAUSE_IP2;
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}
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if (( STATUS_REGISTER & STATUS_IE ) == 0 ) { return; }
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if (( STATUS_REGISTER & STATUS_EXL ) != 0 ) { return; }
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if (( STATUS_REGISTER & STATUS_ERL ) != 0 ) { return; }
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if (( STATUS_REGISTER & FAKE_CAUSE_REGISTER & 0xFF00) != 0) {
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if (!state->CPU_Action->DoInterrupt) {
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state->CPU_Action->DoSomething = 1;
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state->CPU_Action->DoInterrupt = 1;
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}
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}
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}
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void DoAddressError ( usf_state_t * state, uint32_t DelaySlot, uint32_t BadVaddr, uint32_t FromRead) {
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if (FromRead) {
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CAUSE_REGISTER = EXC_RADE;
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} else {
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CAUSE_REGISTER = EXC_WADE;
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}
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BAD_VADDR_REGISTER = BadVaddr;
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if (DelaySlot) {
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CAUSE_REGISTER |= CAUSE_BD;
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EPC_REGISTER = state->PROGRAM_COUNTER - 4;
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} else {
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EPC_REGISTER = state->PROGRAM_COUNTER;
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}
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STATUS_REGISTER |= STATUS_EXL;
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state->PROGRAM_COUNTER = 0x80000180;
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}
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void DoBreakException ( usf_state_t * state, uint32_t DelaySlot) {
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CAUSE_REGISTER = EXC_BREAK;
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if (DelaySlot) {
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CAUSE_REGISTER |= CAUSE_BD;
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EPC_REGISTER = state->PROGRAM_COUNTER - 4;
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} else {
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EPC_REGISTER = state->PROGRAM_COUNTER;
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}
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STATUS_REGISTER |= STATUS_EXL;
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state->PROGRAM_COUNTER = 0x80000180;
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}
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void DoCopUnusableException ( usf_state_t * state, uint32_t DelaySlot, uint32_t Coprocessor ) {
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CAUSE_REGISTER = EXC_CPU;
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if (Coprocessor == 1) { CAUSE_REGISTER |= 0x10000000; }
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if (DelaySlot) {
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CAUSE_REGISTER |= CAUSE_BD;
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EPC_REGISTER = state->PROGRAM_COUNTER - 4;
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} else {
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EPC_REGISTER = state->PROGRAM_COUNTER;
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}
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STATUS_REGISTER |= STATUS_EXL;
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state->PROGRAM_COUNTER = 0x80000180;
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}
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void DoIntrException ( usf_state_t * state, uint32_t DelaySlot ) {
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if (( STATUS_REGISTER & STATUS_IE ) == 0 ) { return; }
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if (( STATUS_REGISTER & STATUS_EXL ) != 0 ) { return; }
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if (( STATUS_REGISTER & STATUS_ERL ) != 0 ) { return; }
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CAUSE_REGISTER = FAKE_CAUSE_REGISTER;
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CAUSE_REGISTER |= EXC_INT;
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EPC_REGISTER = state->PROGRAM_COUNTER;
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if (DelaySlot) {
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CAUSE_REGISTER |= CAUSE_BD;
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EPC_REGISTER -= 4;
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}
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STATUS_REGISTER |= STATUS_EXL;
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state->PROGRAM_COUNTER = 0x80000180;
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}
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void DoTLBMiss ( usf_state_t * state, uint32_t DelaySlot, uint32_t BadVaddr ) {
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CAUSE_REGISTER = EXC_RMISS;
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BAD_VADDR_REGISTER = BadVaddr;
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CONTEXT_REGISTER &= 0xFF80000F;
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CONTEXT_REGISTER |= (BadVaddr >> 9) & 0x007FFFF0;
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ENTRYHI_REGISTER = (BadVaddr & 0xFFFFE000);
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if ((STATUS_REGISTER & STATUS_EXL) == 0) {
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if (DelaySlot) {
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CAUSE_REGISTER |= CAUSE_BD;
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EPC_REGISTER = state->PROGRAM_COUNTER - 4;
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} else {
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EPC_REGISTER = state->PROGRAM_COUNTER;
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}
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if (AddressDefined(state, BadVaddr)) {
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state->PROGRAM_COUNTER = 0x80000180;
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} else {
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state->PROGRAM_COUNTER = 0x80000000;
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}
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STATUS_REGISTER |= STATUS_EXL;
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} else {
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state->PROGRAM_COUNTER = 0x80000180;
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}
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}
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void DoSysCallException ( usf_state_t * state, uint32_t DelaySlot) {
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CAUSE_REGISTER = EXC_SYSCALL;
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if (DelaySlot) {
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CAUSE_REGISTER |= CAUSE_BD;
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EPC_REGISTER = state->PROGRAM_COUNTER - 4;
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} else {
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EPC_REGISTER = state->PROGRAM_COUNTER;
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}
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STATUS_REGISTER |= STATUS_EXL;
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state->PROGRAM_COUNTER = 0x80000180;
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}
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