move common addressing functionality for direct page indirect to cpu_lib and use that as the basis for instructions that utilize that addressing mode
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0f73c71a7e
commit
9398885bc2
189
cpu.js
189
cpu.js
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@ -49,6 +49,27 @@ var cpu_lib = {
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}
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};
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},
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Direct_page_indirect: function(instruction) {
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this.bytes_required = function() {
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return 2;
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};
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this.execute = function(cpu, bytes) {
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cpu.cycle_count+=3;
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if((cpu.r.d&0xff)!==0)
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cpu.cycle_count++;
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var memory_location = bytes[0] + cpu.r.d,
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absolute_location = cpu.mmu.read_word(memory_location);
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if(cpu.p.e||cpu.p.m) {
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instruction.execute(cpu, [cpu.mmu.read_byte(absolute_location)]);
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} else {
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instruction.execute(cpu, [cpu.mmu.read_byte(absolute_location),
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cpu.mmu.read_byte(absolute_location+1)]);
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}
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};
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},
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Absolute: function(instruction) {
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this.bytes_required = function() {
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return 3;
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@ -1333,27 +1354,8 @@ var EOR_absolute_long_indexed_x = {
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var EOR_direct_page = new cpu_lib.addressing.Direct_page(EOR_const);
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var EOR_direct_page_indirect = {
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bytes_required:function() {
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return 2;
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},
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execute:function(cpu, bytes) {
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cpu.cycle_count+=3;
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if((cpu.r.d&0xff)!==0)
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cpu.cycle_count++;
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var memory_location = bytes[0] + cpu.r.d,
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absolute_location = cpu.mmu.read_word(memory_location);
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if(cpu.p.e||cpu.p.m) {
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EOR_const.execute(cpu, [cpu.mmu.read_byte(absolute_location)]);
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} else {
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var low_byte = cpu.mmu.read_byte(absolute_location),
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high_byte = cpu.mmu.read_byte(absolute_location+1);
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EOR_const.execute(cpu, [low_byte, high_byte]);
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}
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}
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};
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var EOR_direct_page_indirect =
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new cpu_lib.addressing.Direct_page_indirect(EOR_const);
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var EOR_direct_page_indexed_x_indirect = {
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bytes_required:function() {
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@ -1568,27 +1570,8 @@ var ORA_absolute_long_indexed_x = {
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var ORA_direct_page = new cpu_lib.addressing.Direct_page(ORA_const);
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var ORA_direct_page_indirect = {
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bytes_required:function() {
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return 2;
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},
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execute:function(cpu, bytes) {
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cpu.cycle_count+=3;
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if((cpu.r.d&0xff)!==0)
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cpu.cycle_count++;
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var memory_location = bytes[0] + cpu.r.d,
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absolute_location = cpu.mmu.read_word(memory_location);
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if(cpu.p.e||cpu.p.m) {
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ORA_const.execute(cpu, [cpu.mmu.read_byte(absolute_location)]);
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} else {
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var low_byte = cpu.mmu.read_byte(absolute_location),
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high_byte = cpu.mmu.read_byte(absolute_location+1);
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ORA_const.execute(cpu, [low_byte, high_byte]);
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}
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}
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};
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var ORA_direct_page_indirect =
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new cpu_lib.addressing.Direct_page_indirect(ORA_const);
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var ORA_direct_page_indexed_x_indirect = {
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bytes_required:function() {
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@ -1801,29 +1784,8 @@ var AND_absolute_long_indexed_x = {
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var AND_direct_page = new cpu_lib.addressing.Direct_page(AND_const);
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var AND_direct_page_indirect = {
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bytes_required:function() {
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return 2;
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},
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execute:function(cpu, bytes) {
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cpu.cycle_count+=3;
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if((cpu.r.d&0xff)!==0)
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cpu.cycle_count++;
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var memory_location = bytes[0] + cpu.r.d,
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low_byte_loc = cpu.mmu.read_byte(memory_location),
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high_byte_loc = cpu.mmu.read_byte(memory_location+1),
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absolute_location = (high_byte_loc<<8) | low_byte_loc;
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if(cpu.p.e||cpu.p.m) {
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AND_const.execute(cpu, [cpu.mmu.read_byte(absolute_location)]);
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} else {
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var low_byte = cpu.mmu.read_byte(absolute_location),
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high_byte = cpu.mmu.read_byte(absolute_location+1);
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AND_const.execute(cpu, [low_byte, high_byte]);
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}
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}
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};
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var AND_direct_page_indirect =
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new cpu_lib.addressing.Direct_page_indirect(AND_const);
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var AND_direct_page_indexed_x_indirect = {
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bytes_required:function() {
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@ -2088,27 +2050,8 @@ var CMP_direct_page = new cpu_lib.addressing.Direct_page(CMP_const);
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var CMP_direct_page_indexed_x =
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new cpu_lib.addressing.Direct_page_indexed_x(CMP_direct_page);
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var CMP_direct_page_indirect = {
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bytes_required:function() {
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return 2;
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},
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execute:function(cpu, bytes) {
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cpu.cycle_count+=3;
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if((cpu.r.d&0xff)!==0)
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cpu.cycle_count++;
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var memory_location = bytes[0] + cpu.r.d,
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absolute_location = cpu.mmu.read_word(memory_location);
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if(cpu.p.e||cpu.p.m) {
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CMP_const.execute(cpu, [cpu.mmu.read_byte(absolute_location)]);
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} else {
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var low_byte = cpu.mmu.read_byte(absolute_location),
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high_byte = cpu.mmu.read_byte(absolute_location+1);
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CMP_const.execute(cpu, [low_byte, high_byte]);
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}
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}
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};
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var CMP_direct_page_indirect =
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new cpu_lib.addressing.Direct_page_indirect(CMP_const);
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var CMP_direct_page_indexed_x_indirect = {
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bytes_required:function() {
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@ -2594,27 +2537,8 @@ var SBC_absolute_indexed_y =
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var SBC_direct_page_indexed_x =
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new cpu_lib.addressing.Direct_page_indexed_x(SBC_direct_page);
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var SBC_direct_page_indirect = {
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bytes_required:function() {
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return 2;
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},
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execute:function(cpu, bytes) {
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cpu.cycle_count+=3;
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if((cpu.r.d&0xff)!==0)
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cpu.cycle_count++;
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var memory_location = bytes[0] + cpu.r.d,
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absolute_location = cpu.mmu.read_word(memory_location);
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if(cpu.p.e||cpu.p.m) {
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SBC_const.execute(cpu, [cpu.mmu.read_byte(absolute_location)]);
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} else {
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var low_byte = cpu.mmu.read_byte(absolute_location),
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high_byte = cpu.mmu.read_byte(absolute_location+1);
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SBC_const.execute(cpu, [low_byte, high_byte]);
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}
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}
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};
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var SBC_direct_page_indirect =
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new cpu_lib.addressing.Direct_page_indirect(SBC_const);
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var SBC_stack_relative = new cpu_lib.addressing.Stack_relative(SBC_const);
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@ -2780,27 +2704,8 @@ var ADC_absolute_long_indexed_x = {
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var ADC_direct_page = new cpu_lib.addressing.Direct_page(ADC_const);
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var ADC_direct_page_indirect = {
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bytes_required:function() {
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return 2;
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},
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execute:function(cpu, bytes) {
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if((cpu.r.d&0x00ff)!==0)
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cpu.cycle_count+=4;
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else
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cpu.cycle_count+=3;
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var memory_location = bytes[0] + cpu.r.d,
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absolute_location = cpu.mmu.read_word(memory_location);
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if(cpu.p.e||cpu.p.m) {
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ADC_const.execute(cpu, [cpu.mmu.read_byte(absolute_location)]);
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} else {
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var low_byte = cpu.mmu.read_byte(absolute_location),
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high_byte = cpu.mmu.read_byte(absolute_location+1);
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ADC_const.execute(cpu, [low_byte, high_byte]);
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}
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}
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};
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var ADC_direct_page_indirect =
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new cpu_lib.addressing.Direct_page_indirect(ADC_const);
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var ADC_direct_page_indexed_x_indirect = {
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bytes_required:function() {
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@ -3768,31 +3673,6 @@ var STA_stack_relative_indirect_indexed_y = {
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}
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};
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var LDA_direct_page_indirect = {
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bytes_required:function() {
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return 2;
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},
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execute:function(cpu, bytes) {
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cpu.cycle_count+=5;
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if((cpu.r.d&0xff)!==0)
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cpu.cycle_count++;
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var memory_location = bytes[0] + cpu.r.d,
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absolute_location = cpu.mmu.read_word(memory_location);
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if(cpu.p.e||cpu.p.m) {
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cpu.r.a = cpu.mmu.read_byte(absolute_location);
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cpu.p.n = cpu.r.a >> 7;
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} else {
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cpu.cycle_count++;
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cpu.r.a = cpu.mmu.read_word(absolute_location);
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cpu.p.n = cpu.r.a >> 15;
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}
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cpu_lib.r.p.check_z(cpu, cpu.r.a);
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}
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};
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var LDA_direct_page_indexed_x_indirect = {
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bytes_required:function() {
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return 2;
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@ -4777,6 +4657,9 @@ var LDA_direct_page = new cpu_lib.addressing.Direct_page(LDA_const);
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var LDA_direct_page_indexed_x =
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new cpu_lib.addressing.Direct_page_indexed_x(LDA_direct_page);
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var LDA_direct_page_indirect =
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new cpu_lib.addressing.Direct_page_indirect(LDA_const);
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var LDA_absolute = new cpu_lib.addressing.Absolute(LDA_const);
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var LDA_absolute_indexed_x =
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