mirror of https://github.com/snes9xgit/snes9x.git
487 lines
6.6 KiB
C++
487 lines
6.6 KiB
C++
case 0x00: {
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op_io();
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opcode_cycle = 0;
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break;
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}
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case 0xef: {
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op_io(2);
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regs.pc--;
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opcode_cycle = 0;
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break;
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}
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case 0xff: {
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op_io(2);
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regs.pc--;
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opcode_cycle = 0;
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break;
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}
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case 0x9f: {
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op_io(4);
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regs.a = (regs.a >> 4) | (regs.a << 4);
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regs.p.n = !!(regs.a & 0x80);
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regs.p.z = (regs.a == 0);
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opcode_cycle = 0;
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break;
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}
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case 0xdf: {
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op_io(2);
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if(regs.p.c || (regs.a) > 0x99) {
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regs.a += 0x60;
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regs.p.c = 1;
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}
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if(regs.p.h || (regs.a & 15) > 0x09) {
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regs.a += 0x06;
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}
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regs.p.n = !!(regs.a & 0x80);
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regs.p.z = (regs.a == 0);
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opcode_cycle = 0;
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break;
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}
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case 0xbe: {
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op_io(2);
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if(!regs.p.c || (regs.a) > 0x99) {
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regs.a -= 0x60;
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regs.p.c = 0;
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}
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if(!regs.p.h || (regs.a & 15) > 0x09) {
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regs.a -= 0x06;
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}
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regs.p.n = !!(regs.a & 0x80);
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regs.p.z = (regs.a == 0);
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opcode_cycle = 0;
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break;
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}
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case 0x60: {
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op_io();
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regs.p.c = 0;
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opcode_cycle = 0;
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break;
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}
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case 0x20: {
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op_io();
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regs.p.p = 0;
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opcode_cycle = 0;
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break;
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}
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case 0x80: {
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op_io();
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regs.p.c = 1;
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opcode_cycle = 0;
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break;
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}
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case 0x40: {
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op_io();
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regs.p.p = 1;
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opcode_cycle = 0;
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break;
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}
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case 0xe0: {
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op_io();
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regs.p.v = 0;
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regs.p.h = 0;
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opcode_cycle = 0;
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break;
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}
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case 0xed: {
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op_io(2);
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regs.p.c = !regs.p.c;
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opcode_cycle = 0;
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break;
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}
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case 0xa0: {
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op_io(2);
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regs.p.i = 1;
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opcode_cycle = 0;
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break;
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}
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case 0xc0: {
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switch(opcode_cycle++) {
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case 1:
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op_io();
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break;
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case 2:
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op_io();
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regs.p.i = 0;
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opcode_cycle = 0;
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break;
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}
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break;
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}
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case 0x02: {
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switch(opcode_cycle++) {
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case 1:
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dp = op_readpc();
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break;
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case 2:
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rd = op_readdp(dp);
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break;
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case 3:
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rd |= 0x01;
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op_writedp(dp, rd);
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opcode_cycle = 0;
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break;
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}
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break;
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}
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case 0x12: {
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switch(opcode_cycle++) {
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case 1:
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dp = op_readpc();
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break;
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case 2:
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rd = op_readdp(dp);
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break;
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case 3:
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rd &= ~0x01;
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op_writedp(dp, rd);
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opcode_cycle = 0;
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break;
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}
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break;
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}
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case 0x22: {
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switch(opcode_cycle++) {
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case 1:
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dp = op_readpc();
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break;
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case 2:
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rd = op_readdp(dp);
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break;
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case 3:
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rd |= 0x02;
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op_writedp(dp, rd);
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opcode_cycle = 0;
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break;
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}
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break;
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}
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case 0x32: {
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switch(opcode_cycle++) {
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case 1:
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dp = op_readpc();
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break;
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case 2:
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rd = op_readdp(dp);
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break;
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case 3:
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rd &= ~0x02;
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op_writedp(dp, rd);
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opcode_cycle = 0;
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break;
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}
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break;
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}
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case 0x42: {
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switch(opcode_cycle++) {
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case 1:
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dp = op_readpc();
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break;
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case 2:
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rd = op_readdp(dp);
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break;
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case 3:
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rd |= 0x04;
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op_writedp(dp, rd);
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opcode_cycle = 0;
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break;
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}
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break;
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}
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case 0x52: {
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switch(opcode_cycle++) {
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case 1:
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dp = op_readpc();
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break;
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case 2:
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rd = op_readdp(dp);
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break;
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case 3:
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rd &= ~0x04;
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op_writedp(dp, rd);
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opcode_cycle = 0;
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break;
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}
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break;
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}
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case 0x62: {
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switch(opcode_cycle++) {
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case 1:
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dp = op_readpc();
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break;
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case 2:
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rd = op_readdp(dp);
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break;
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case 3:
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rd |= 0x08;
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op_writedp(dp, rd);
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opcode_cycle = 0;
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break;
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}
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break;
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}
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case 0x72: {
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switch(opcode_cycle++) {
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case 1:
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dp = op_readpc();
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break;
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case 2:
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rd = op_readdp(dp);
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break;
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case 3:
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rd &= ~0x08;
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op_writedp(dp, rd);
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opcode_cycle = 0;
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break;
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}
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break;
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}
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case 0x82: {
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switch(opcode_cycle++) {
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case 1:
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dp = op_readpc();
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break;
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case 2:
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rd = op_readdp(dp);
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break;
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case 3:
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rd |= 0x10;
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op_writedp(dp, rd);
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opcode_cycle = 0;
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break;
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}
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break;
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}
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case 0x92: {
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switch(opcode_cycle++) {
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case 1:
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dp = op_readpc();
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break;
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case 2:
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rd = op_readdp(dp);
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break;
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case 3:
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rd &= ~0x10;
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op_writedp(dp, rd);
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opcode_cycle = 0;
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break;
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}
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break;
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}
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case 0xa2: {
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switch(opcode_cycle++) {
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case 1:
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dp = op_readpc();
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break;
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case 2:
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rd = op_readdp(dp);
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break;
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case 3:
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rd |= 0x20;
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op_writedp(dp, rd);
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opcode_cycle = 0;
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break;
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}
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break;
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}
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case 0xb2: {
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switch(opcode_cycle++) {
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case 1:
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dp = op_readpc();
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break;
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case 2:
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rd = op_readdp(dp);
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break;
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case 3:
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rd &= ~0x20;
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op_writedp(dp, rd);
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opcode_cycle = 0;
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break;
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}
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break;
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}
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case 0xc2: {
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switch(opcode_cycle++) {
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case 1:
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dp = op_readpc();
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break;
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case 2:
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rd = op_readdp(dp);
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break;
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case 3:
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rd |= 0x40;
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op_writedp(dp, rd);
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opcode_cycle = 0;
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break;
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}
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break;
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}
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case 0xd2: {
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switch(opcode_cycle++) {
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case 1:
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dp = op_readpc();
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break;
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case 2:
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rd = op_readdp(dp);
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break;
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case 3:
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rd &= ~0x40;
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op_writedp(dp, rd);
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opcode_cycle = 0;
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break;
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}
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break;
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}
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case 0xe2: {
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switch(opcode_cycle++) {
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case 1:
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dp = op_readpc();
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break;
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case 2:
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rd = op_readdp(dp);
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break;
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case 3:
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rd |= 0x80;
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op_writedp(dp, rd);
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opcode_cycle = 0;
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break;
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}
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break;
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}
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case 0xf2: {
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switch(opcode_cycle++) {
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case 1:
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dp = op_readpc();
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break;
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case 2:
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rd = op_readdp(dp);
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break;
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case 3:
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rd &= ~0x80;
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op_writedp(dp, rd);
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opcode_cycle = 0;
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break;
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}
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break;
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}
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case 0x2d: {
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op_io(2);
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op_writestack(regs.a);
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opcode_cycle = 0;
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break;
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}
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case 0x4d: {
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op_io(2);
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op_writestack(regs.x);
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opcode_cycle = 0;
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break;
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}
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case 0x6d: {
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op_io(2);
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op_writestack(regs.y);
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opcode_cycle = 0;
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break;
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}
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case 0x0d: {
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op_io(2);
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op_writestack(regs.p);
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opcode_cycle = 0;
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break;
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}
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case 0xae: {
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op_io(2);
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regs.a = op_readstack();
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opcode_cycle = 0;
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break;
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}
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case 0xce: {
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op_io(2);
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regs.x = op_readstack();
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opcode_cycle = 0;
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break;
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}
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case 0xee: {
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op_io(2);
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regs.y = op_readstack();
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opcode_cycle = 0;
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break;
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}
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case 0x8e: {
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op_io(2);
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regs.p = op_readstack();
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opcode_cycle = 0;
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break;
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}
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case 0xcf: {
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op_io(8);
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ya = regs.y * regs.a;
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regs.a = ya;
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regs.y = ya >> 8;
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//result is set based on y (high-byte) only
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regs.p.n = !!(regs.y & 0x80);
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regs.p.z = (regs.y == 0);
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opcode_cycle = 0;
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break;
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}
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case 0x9e: {
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op_io(11);
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ya = regs.ya;
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//overflow set if quotient >= 256
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regs.p.v = !!(regs.y >= regs.x);
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regs.p.h = !!((regs.y & 15) >= (regs.x & 15));
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if(regs.y < (regs.x << 1)) {
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//if quotient is <= 511 (will fit into 9-bit result)
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regs.a = ya / regs.x;
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regs.y = ya % regs.x;
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} else {
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//otherwise, the quotient won't fit into regs.p.v + regs.a
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//this emulates the odd behavior of the S-SMP in this case
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regs.a = 255 - (ya - (regs.x << 9)) / (256 - regs.x);
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regs.y = regs.x + (ya - (regs.x << 9)) % (256 - regs.x);
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}
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//result is set based on a (quotient) only
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regs.p.n = !!(regs.a & 0x80);
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regs.p.z = (regs.a == 0);
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opcode_cycle = 0;
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break;
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}
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