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fixed timing issues
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ArthurFerreira2
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puce6502.c
261
puce6502.c
@ -1,9 +1,14 @@
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/*
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puce6502 - MOS 6502 cpu emulator
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Last modified 1st of August 2020
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Last modified 21st of June 2021
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Copyright (c) 2018 Arthur Ferreira (arthur.ferreira2@gmail.com)
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This version has been modified for reinette II plus, a french Apple II plus
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emulator using SDL2 (https://github.com/ArthurFerreira2/reinette-II-plus).
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Please download the latest version from
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https://github.com/ArthurFerreira2/puce6502
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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@ -21,14 +26,39 @@
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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// set to zero for 'normal' use
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// or to 1 if you want to run the functionnal tests
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#define _FUNCTIONNAL_TESTS 1
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#include "puce6502.h"
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// function to be provided by user to handle read and writes to locations not
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// in ROM or in RAM : Soft Switches, extension cards ROMs, PIA, VIA, ACIA etc...
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extern uint8_t softSwitches(uint16_t address, uint8_t value);
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#define CARRY 0x01
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#define ZERO 0x02
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#define INTR 0x04
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#define DECIM 0x08
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#define BREAK 0x10
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#define UNDEF 0x20
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#define OFLOW 0x40
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#define SIGN 0x80
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#if _FUNCTIONNAL_TESTS
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// for functionnal tests, see main()
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uint8_t RAM[65536];
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inline uint8_t readMem(uint16_t address) { return RAM[address]; }
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inline void writeMem(uint16_t address, uint8_t value) { RAM[address] = value; }
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#else
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// user provided functions
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extern uint8_t readMem(uint16_t address);
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extern void writeMem(uint16_t address, uint8_t value);
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#endif
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#define CARRY 0x01
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@ -40,27 +70,23 @@ extern uint8_t softSwitches(uint16_t address, uint8_t value);
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#define OFLOW 0x40
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#define SIGN 0x80
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struct Operand {
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static struct Operand {
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uint8_t code;
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bool setAcc;
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uint8_t value;
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uint16_t address;
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bool setAcc;
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} ope;
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struct Register {
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static struct Register {
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uint8_t A,X,Y,SR,SP;
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uint16_t PC;
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} reg;
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// instruction timing :
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// http://nparker.llx.com/a2/opcodes.html
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// http://wouter.bbcmicro.net/general/6502/6502_opcodes.html
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// NOT IMPLEMENTED :
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// Absolute-X, absolute-Y, and Zpage-Y addressing modes need an extra cycle
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// if indexing crosses a page boundary, or if the instruction writes to memory.
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unsigned long long int ticks; // exportable to user modules
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static int cycles[256] = { // cycle count per instruction
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static const int cycles[256] = { // cycles per instruction
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7,6,0,0,0,3,5,0,3,2,2,0,0,4,6,0,3,5,0,0,0,4,6,0,2,4,0,0,0,4,7,0,
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6,6,0,0,3,3,5,0,4,2,2,0,4,4,6,0,3,5,0,0,0,4,6,0,2,4,0,0,0,4,7,0,
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6,6,0,0,0,3,5,0,3,2,2,0,3,4,6,0,3,5,0,0,0,4,6,0,2,4,0,0,0,4,7,0,
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@ -72,20 +98,6 @@ static int cycles[256] = { // cycle count per instruction
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};
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//=============================================================== MEMORY AND I/O
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inline static uint8_t readMem(uint16_t address){
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if (address < RAMSIZE) return(ram[address]);
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if (address >= ROMSTART) return(rom[address - ROMSTART]);
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return softSwitches(address, 0); // MEMORY MAPPED I/O
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}
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inline static void writeMem(uint16_t address, uint8_t value){
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if (address < RAMSIZE) ram[address] = value;
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else if (address < ROMSTART) softSwitches(address, value);
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}
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//=============================================== STACK, SIGN AND OTHER ROUTINES
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inline static void push(uint8_t value){
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@ -96,7 +108,7 @@ inline static uint8_t pull(){
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return(readMem(0x100 + ++reg.SP));
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}
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inline static void setSZ(uint8_t value){ // update both the Sign & Zero FLAGS
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inline static void setSZ(uint8_t value){ // updates both the Sign & Zero FLAGS
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if (value & 0x00FF) reg.SR &= ~ZERO;
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else reg.SR |= ZERO;
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if (value & 0x80) reg.SR |= SIGN;
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@ -109,7 +121,7 @@ inline static void branch(){ // used by the 8 branch instructions
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reg.PC += ope.address;
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}
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inline static void makeUpdates(uint8_t val){ // used by ASL, LSR, ROL and ROR
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inline static void makeUpdates(uint8_t val){ // used by ASL, LSR, ROL and ROR
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if (ope.setAcc){
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reg.A = val;
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ope.setAcc = false;
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@ -145,6 +157,7 @@ static void ZPX(){ // Zero Page,X
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}
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static void ZPY(){ // Zero Page,Y
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if (readMem(reg.PC) + reg.Y > 0xFF) ticks++;
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ope.address = (readMem(reg.PC++) + reg.Y) & 0xFF;
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ope.value = readMem(ope.address);
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}
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@ -161,12 +174,14 @@ static void ABS(){ // ABSolute
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}
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static void ABX(){ // ABsolute,X
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if (readMem(reg.PC) + reg.X > 0xFF) ticks++;
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ope.address = (readMem(reg.PC) | (readMem(reg.PC + 1) << 8)) + reg.X;
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ope.value = readMem(ope.address);
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reg.PC += 2;
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}
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static void ABY(){ // ABsolute,Y
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if (readMem(reg.PC) + reg.Y > 0xFF) ticks++;
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ope.address = (readMem(reg.PC) | (readMem(reg.PC + 1) << 8)) + reg.Y;
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ope.value = readMem(ope.address);
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reg.PC += 2;
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@ -204,7 +219,7 @@ void BRK(){ // BReaK
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push(reg.PC & 0xFF);
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push(reg.SR | BREAK);
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reg.SR |= INTR;
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reg.PC = readMem(0xFFFE) | (readMem(0xFFFF) << 8);
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reg.PC = readMem(0xFFFE) | ((readMem(0xFFFF) << 8)); // IRQ/BRK vect @FFFE/FF
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}
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static void CLD(){ // CLear Decimal
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@ -482,7 +497,7 @@ static void UND(){ // UNDefined (not a valid or supported 6502 opcode)
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//================================================================== JUMP TABLES
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static void (*instruction[])(void) = {
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static void (*instruction[256])(void) = {
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BRK, ORA, UND, UND, UND, ORA, ASL, UND, PHP, ORA, ASL, UND, UND, ORA, ASL, UND,
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BPL, ORA, UND, UND, UND, ORA, ASL, UND, CLC, ORA, UND, UND, UND, ORA, ASL, UND,
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JSR, AND, UND, UND, BIT, AND, ROL, UND, PLP, AND, ROL, UND, BIT, AND, ROL, UND,
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@ -501,7 +516,7 @@ static void (*instruction[])(void) = {
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BEQ, SBC, UND, UND, UND, SBC, INC, UND, SED, SBC, UND, UND, UND, SBC, INC, UND
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};
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static void (*addressing[])(void) = {
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static void (*addressing[256])(void) = {
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IMP, IDX, IMP, IMP, IMP, ZPG, ZPG, IMP, IMP, IMM, ACC, IMP, IMP, ABS, ABS, IMP,
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REL, IDY, IMP, IMP, IMP, ZPX, ZPX, IMP, IMP, ABY, IMP, IMP, IMP, ABX, ABX, IMP,
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ABS, IDX, IMP, IMP, ZPG, ZPG, ZPG, IMP, IMP, IMM, ACC, IMP, ABS, ABS, ABS, IMP,
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@ -523,15 +538,8 @@ static void (*addressing[])(void) = {
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//========================================================= USER INTERFACE (API)
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void puce6502Reset(){
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reg.PC = readMem(0xFFFC) | (readMem(0xFFFD) << 8);
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reg.SP = 0xFF;
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reg.SR = (reg.SR | INTR) & ~DECIM;
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ope.setAcc = false;
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ticks += 7;
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}
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void puce6502Exec(long long int cycleCount){
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uint16_t puce6502Exec(unsigned long long int cycleCount){
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cycleCount += ticks; // cycleCount becomes the target ticks value
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while (ticks < cycleCount) {
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ope.code = readMem(reg.PC++); // FETCH and increment the Program Counter
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@ -539,4 +547,171 @@ void puce6502Exec(long long int cycleCount){
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instruction[ope.code](); // EXECUTE the instruction
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ticks += cycles[ope.code]; // update ticks count
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}
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return reg.PC;
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}
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void puce6502RST() {
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reg.PC = readMem(0xFFFC) | (readMem(0xFFFD) << 8);
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reg.SP = 0xFF;
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reg.SR = (reg.SR | INTR | BREAK | UNDEF) & ~DECIM;
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ticks += 7;
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}
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void puce6502NMI() {
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writeMem(0x100 + reg.SP--, ((reg.PC) >> 8) & 0xFF);
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writeMem(0x100 + reg.SP--, reg.PC & 0xFF);
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writeMem(0x100 + reg.SP--, reg.SR);
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reg.PC = readMem(0xFFFA) | (readMem(0xFFFB) << 8);
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ticks += 7;
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}
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void puce6502IRQ() {
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if (!(reg.SR & INTR)) return;
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writeMem(0x100 + reg.SP--, ((reg.PC) >> 8) & 0xFF);
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writeMem(0x100 + reg.SP--, reg.PC & 0xFF);
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writeMem(0x100 + reg.SP--, reg.SR);
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reg.PC = readMem(0xFFFE) | (readMem(0xFFFF) << 8);
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ticks += 7;
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}
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// ALL the code down below was used during developpment for test and debug
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// and is not required for normal operation
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#include <stdio.h>
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static const char* mn[256] = {
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"BRK","ORA","UND","UND","UND","ORA","ASL","UND","PHP","ORA","ASL","UND","UND","ORA","ASL","UND",
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"BPL","ORA","UND","UND","UND","ORA","ASL","UND","CLC","ORA","UND","UND","UND","ORA","ASL","UND",
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"JSR","AND","UND","UND","BIT","AND","ROL","UND","PLP","AND","ROL","UND","BIT","AND","ROL","UND",
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"BMI","AND","UND","UND","UND","AND","ROL","UND","SEC","AND","UND","UND","UND","AND","ROL","UND",
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"RTI","EOR","UND","UND","UND","EOR","LSR","UND","PHA","EOR","LSR","UND","JMP","EOR","LSR","UND",
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"BVC","EOR","UND","UND","UND","EOR","LSR","UND","CLI","EOR","UND","UND","UND","EOR","LSR","UND",
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"RTS","ADC","UND","UND","UND","ADC","ROR","UND","PLA","ADC","ROR","UND","JMP","ADC","ROR","UND",
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"BVS","ADC","UND","UND","UND","ADC","ROR","UND","SEI","ADC","UND","UND","UND","ADC","ROR","UND",
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"UND","STA","UND","UND","STY","STA","STX","UND","DEY","UND","TXA","UND","STY","STA","STX","UND",
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"BCC","STA","UND","UND","STY","STA","STX","UND","TYA","STA","TXS","UND","UND","STA","UND","UND",
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"LDY","LDA","LDX","UND","LDY","LDA","LDX","UND","TAY","LDA","TAX","UND","LDY","LDA","LDX","UND",
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"BCS","LDA","UND","UND","LDY","LDA","LDX","UND","CLV","LDA","TSX","UND","LDY","LDA","LDX","UND",
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"CPY","CMP","UND","UND","CPY","CMP","DEC","UND","INY","CMP","DEX","UND","CPY","CMP","DEC","UND",
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"BNE","CMP","UND","UND","UND","CMP","DEC","UND","CLD","CMP","UND","UND","UND","CMP","DEC","UND",
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"CPX","SBC","UND","UND","CPX","SBC","INC","UND","INX","SBC","NOP","UND","CPX","SBC","INC","UND",
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"BEQ","SBC","UND","UND","UND","SBC","INC","UND","SED","SBC","UND","UND","UND","SBC","INC","UND"
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};
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static const int am[256] = {
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0x0 , 0xC , 0x0 , 0x0 , 0x0 , 0x3 , 0x3 , 0x0 , 0x0 , 0x2 , 0x1 , 0x0 , 0x0 , 0x7 , 0x7 , 0x0 ,
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0x6 , 0xD , 0x0 , 0x0 , 0x0 , 0x4 , 0x4 , 0x0 , 0x0 , 0x9 , 0x0 , 0x0 , 0x0 , 0x8 , 0x8 , 0x0 ,
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0x7 , 0xC , 0x0 , 0x0 , 0x3 , 0x3 , 0x3 , 0x0 , 0x0 , 0x2 , 0x1 , 0x0 , 0x7 , 0x7 , 0x7 , 0x0 ,
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0x6 , 0xD , 0x0 , 0x0 , 0x0 , 0x4 , 0x4 , 0x0 , 0x0 , 0x9 , 0x0 , 0x0 , 0x0 , 0x8 , 0x8 , 0x0 ,
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0x0 , 0xC , 0x0 , 0x0 , 0x0 , 0x3 , 0x3 , 0x0 , 0x0 , 0x2 , 0x1 , 0x0 , 0x7 , 0x7 , 0x7 , 0x0 ,
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0x6 , 0xD , 0x0 , 0x0 , 0x0 , 0x4 , 0x4 , 0x0 , 0x0 , 0x9 , 0x0 , 0x0 , 0x0 , 0x8 , 0x8 , 0x0 ,
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0x0 , 0xC , 0x0 , 0x0 , 0x0 , 0x3 , 0x3 , 0x0 , 0x0 , 0x2 , 0x1 , 0x0 , 0xA , 0x7 , 0x7 , 0x0 ,
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0x6 , 0xD , 0x0 , 0x0 , 0x0 , 0x4 , 0x4 , 0x0 , 0x0 , 0x9 , 0x0 , 0x0 , 0x0 , 0x8 , 0x8 , 0x0 ,
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0x0 , 0xC , 0x0 , 0x0 , 0x3 , 0x3 , 0x3 , 0x0 , 0x0 , 0x0 , 0x0 , 0x0 , 0x7 , 0x7 , 0x7 , 0x0 ,
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0x6 , 0xD , 0x0 , 0x0 , 0x4 , 0x4 , 0x5 , 0x0 , 0x0 , 0x9 , 0x0 , 0x0 , 0x0 , 0x8 , 0x0 , 0x0 ,
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0x2 , 0xC , 0x2 , 0x0 , 0x3 , 0x3 , 0x3 , 0x0 , 0x0 , 0x2 , 0x0 , 0x0 , 0x7 , 0x7 , 0x7 , 0x0 ,
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0x6 , 0xD , 0x0 , 0x0 , 0x4 , 0x4 , 0x5 , 0x0 , 0x0 , 0x9 , 0x0 , 0x0 , 0x8 , 0x8 , 0x9 , 0x0 ,
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0x2 , 0xC , 0x0 , 0x0 , 0x3 , 0x3 , 0x3 , 0x0 , 0x0 , 0x2 , 0x0 , 0x0 , 0x7 , 0x7 , 0x7 , 0x0 ,
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0x6 , 0xD , 0x0 , 0x0 , 0x0 , 0x4 , 0x4 , 0x0 , 0x0 , 0x9 , 0x0 , 0x0 , 0x0 , 0x8 , 0x8 , 0x0 ,
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0x2 , 0xC , 0x0 , 0x0 , 0x3 , 0x3 , 0x3 , 0x0 , 0x0 , 0x2 , 0x0 , 0x0 , 0x7 , 0x7 , 0x7 , 0x0 ,
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0x6 , 0xD , 0x0 , 0x0 , 0x0 , 0x4 , 0x4 , 0x0 , 0x0 , 0x9 , 0x0 , 0x0 , 0x0 , 0x8 , 0x8 , 0x0
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};
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void dasm(uint16_t address) {
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uint8_t op = readMem(address);
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uint8_t b1 = readMem((address + 1) & 0xFFFF);
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uint8_t b2 = readMem((address + 2) & 0xFFFF);
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printf("%04X %02X ", address, op);
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switch(am[op]) {
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case 0x0: printf(" %s ", mn[op] ); break; // implied
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case 0x1: printf(" %s A ", mn[op] ); break; // accumulator
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case 0x2: printf("%02X %s #$%02X ", b1, mn[op],b1 ); break; // immediate
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case 0x3: printf("%02X %s $%02X ", b1, mn[op],b1 ); break; // zero page
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case 0x4: printf("%02X %s $%02X,X ", b1, mn[op],b1 ); break; // zero page, X indexed
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case 0x5: printf("%02X %s $%02X,Y ", b1, mn[op],b1 ); break; // zero page, Y indexed
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case 0x6: printf("%02X %s $%02X ", b1, mn[op],b1 ); break; // relative
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case 0xC: printf("%02X %s ($%02X,X) ", b1, mn[op],b1 ); break; // X indexed, indirect
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case 0xD: printf("%02X %s ($%02X),Y ", b1, mn[op],b1 ); break; // indirect, Y indexed
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case 0x7: printf("%02X%02X %s $%02X%02X ",b1,b2,mn[op],b2,b1); break; // absolute
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case 0x8: printf("%02X%02X %s $%02X%02X,X ",b1,b2,mn[op],b2,b1); break; // absolute, X indexed
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case 0x9: printf("%02X%02X %s $%02X%02X,Y ",b1,b2,mn[op],b2,b1); break; // absolute, Y indexed
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case 0xA: printf("%02X%02X %s ($%02X%02X) ",b1,b2,mn[op],b2,b1); break; // indirect
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}
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}
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void printRegs() {
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printf("A=%02X X=%02X Y=%02X S=%02X *S=%02X %c%c%c%c%c%c%c%c", \
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reg.A, reg.X, reg.Y, reg.SP, readMem(0x100 + reg.SP), \
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reg.SR&SIGN?'N':'-', reg.SR&OFLOW?'V':'-',reg.SR&UNDEF?'U':'.',reg.SR&BREAK?'B':'-', \
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reg.SR&DECIM?'D':'-',reg.SR&INTR?'I':'-', reg.SR&ZERO?'Z':'-', reg.SR&CARRY?'C':'-');
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}
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void setPC(uint16_t address) {
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reg.PC = address;
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}
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uint16_t getPC(){
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return reg.PC;
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}
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#if _FUNCTIONNAL_TESTS
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// 6502 functonnal tests
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// using Klaus Dormann's functonnal tests published at :
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// https://github.com/Klaus2m5/6502_65C02_functional_tests
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int main(int argc, char* argv[]){
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char *filename = "6502_functional_test.bin";
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FILE *f = fopen(filename, "rb");
|
||||
if (!f || fread(RAM, 1, 65536, f) != 65536) {
|
||||
printf("ERROR : can't load %s\n", filename);
|
||||
return(0);
|
||||
}
|
||||
fclose(f);
|
||||
|
||||
puce6502RST(); // reset the CPU
|
||||
reg.PC = 0x0400; // set Program Counter to start of code
|
||||
|
||||
unsigned long long int oldticks = ticks;
|
||||
uint16_t oldPC = 0x0400, newPC = 0x0400; // to detect the BNE $FE when an error occurs
|
||||
|
||||
while(1) {
|
||||
dasm(newPC);
|
||||
printf(" ");
|
||||
newPC = puce6502Exec(1);
|
||||
printRegs();
|
||||
printf(" Cycles: %llu Total: %llu\n", ticks - oldticks, ticks);
|
||||
oldticks = ticks;
|
||||
|
||||
if (newPC == 0x3469){ // 6502_functional_test SUCCESS
|
||||
printf("\nReached end of 6502_functional_test @ %04X : SUCCESS !\n", newPC);
|
||||
break;
|
||||
}
|
||||
|
||||
if (newPC == oldPC ) {
|
||||
printf("\n\nLoop detected @ %04X - Press ENTER to proceed with next test or CTRL<C> to stop\n\n", newPC);
|
||||
return(-1);
|
||||
getchar();
|
||||
reg.PC = newPC + 2;
|
||||
}
|
||||
oldPC = newPC;
|
||||
}
|
||||
|
||||
return(0);
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
30
puce6502.h
30
puce6502.h
@ -3,6 +3,12 @@
|
||||
Last modified 1st of August 2020
|
||||
Copyright (c) 2018 Arthur Ferreira (arthur.ferreira2@gmail.com)
|
||||
|
||||
This version has been modified for reinette II plus, a french Apple II plus
|
||||
emulator using SDL2 (https://github.com/ArthurFerreira2/reinette-II-plus).
|
||||
|
||||
Please download the latest version from
|
||||
https://github.com/ArthurFerreira2/puce6502
|
||||
|
||||
Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
of this software and associated documentation files (the "Software"), to deal
|
||||
in the Software without restriction, including without limitation the rights
|
||||
@ -22,22 +28,24 @@
|
||||
THE SOFTWARE.
|
||||
*/
|
||||
|
||||
#ifndef _CPU_H
|
||||
#define _CPU_H
|
||||
|
||||
#ifndef _PUCE6502_H
|
||||
#define _PUCE6502_H
|
||||
|
||||
typedef unsigned char uint8_t;
|
||||
typedef unsigned short uint16_t;
|
||||
typedef enum {false, true} bool;
|
||||
typedef enum { false, true } bool;
|
||||
|
||||
#define ROMSTART 0xD000
|
||||
#define ROMSIZE 0x3000
|
||||
#define RAMSIZE 0xC000
|
||||
extern unsigned long long int ticks;
|
||||
|
||||
uint8_t rom[ROMSIZE];
|
||||
uint8_t ram[RAMSIZE];
|
||||
uint16_t puce6502Exec(unsigned long long int cycleCount);
|
||||
void puce6502RST();
|
||||
void puce6502IRQ();
|
||||
void puce6502NMI();
|
||||
|
||||
long long int ticks;
|
||||
// void printRegs();
|
||||
// void dasm(uint16_t address);
|
||||
// void setPC(uint16_t address);
|
||||
// uint16_t getPC();
|
||||
|
||||
void puce6502Reset();
|
||||
void puce6502Exec(long long int cycleCount);
|
||||
#endif
|
||||
|
||||
Loading…
Reference in New Issue
Block a user