move common addressing functionality for direct page indexed x indirect to cpu_lib and use that as the basis for instructions that utilize that addressing mode
This commit is contained in:
parent
23bedf5ce7
commit
664bf85268
320
cpu.js
320
cpu.js
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@ -49,6 +49,45 @@ var cpu_lib = {
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}
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}
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};
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};
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},
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},
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Direct_page_indexed_x_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+=4;
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if((cpu.r.d&0xff)!==0)
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cpu.cycle_count++;
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if(cpu.p.e) {
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var memory_location = (bytes[0] + cpu.r.x) & 0xff,
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low_byte_loc = cpu.mmu.read_byte_long(memory_location+cpu.r.d,0),
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high_byte_read_loc = ((memory_location+1)&0xff)+cpu.r.d,
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high_byte_loc = cpu.mmu.read_byte_long(high_byte_read_loc, 0);
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instruction.execute(cpu, [cpu.mmu.read_byte((high_byte_loc<<8) |
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low_byte_loc)]);
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} else if(cpu.p.m) {
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var memory_location = bytes[0] + cpu.r.d + cpu.r.x,
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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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instruction.execute(cpu, [cpu.mmu.read_byte((high_byte_loc<<8) |
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low_byte_loc)]);
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} else {
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var memory_location = bytes[0] + cpu.r.d + cpu.r.x,
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absolute_location = cpu.mmu.read_word(memory_location),
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low_byte = cpu.mmu.read_byte(absolute_location),
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high_byte;
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absolute_location++;
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if(absolute_location&0x10000) {
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high_byte = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
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} else {
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high_byte = cpu.mmu.read_byte(absolute_location);
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}
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instruction.execute(cpu, [low_byte, high_byte]);
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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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Direct_page_indirect: function(instruction) {
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this.bytes_required = function() {
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this.bytes_required = function() {
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return 2;
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return 2;
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@ -1365,44 +1404,8 @@ 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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var EOR_direct_page_indirect =
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new cpu_lib.addressing.Direct_page_indirect(EOR_const);
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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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var EOR_direct_page_indexed_x_indirect =
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bytes_required:function() {
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new cpu_lib.addressing.Direct_page_indexed_x_indirect(EOR_const);
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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+=4;
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if((cpu.r.d&0xff)!==0)
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cpu.cycle_count++;
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if(cpu.p.e) {
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var memory_location = (bytes[0] + cpu.r.x) & 0xff,
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low_byte_loc = cpu.mmu.read_byte_long(memory_location+cpu.r.d, 0),
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high_byte_read_loc = ((memory_location+1)&0xff)+cpu.r.d,
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high_byte_loc = cpu.mmu.read_byte_long(high_byte_read_loc, 0);
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EOR_const.execute(cpu, [cpu.mmu.read_byte((high_byte_loc<<8) |
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low_byte_loc)]);
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} else if(cpu.p.m) {
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var memory_location = bytes[0] + cpu.r.d + cpu.r.x,
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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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EOR_const.execute(cpu, [cpu.mmu.read_byte((high_byte_loc<<8) |
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low_byte_loc)]);
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} else {
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var memory_location = bytes[0] + cpu.r.d + cpu.r.x,
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absolute_location = cpu.mmu.read_word(memory_location),
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low_byte = cpu.mmu.read_byte(absolute_location),
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high_byte;
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absolute_location++;
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if(absolute_location&0x10000) {
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high_byte = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
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} else {
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high_byte = cpu.mmu.read_byte(absolute_location);
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}
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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_long_indexed_y = {
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var EOR_direct_page_indirect_long_indexed_y = {
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bytes_required:function() {
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bytes_required:function() {
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@ -1539,44 +1542,8 @@ 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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var ORA_direct_page_indirect =
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new cpu_lib.addressing.Direct_page_indirect(ORA_const);
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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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var ORA_direct_page_indexed_x_indirect =
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bytes_required:function() {
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new cpu_lib.addressing.Direct_page_indexed_x_indirect(ORA_const);
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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+=4;
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if((cpu.r.d&0xff)!==0)
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cpu.cycle_count++;
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if(cpu.p.e) {
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var memory_location = (bytes[0] + cpu.r.x) & 0xff,
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low_byte_loc = cpu.mmu.read_byte_long(memory_location+cpu.r.d, 0),
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high_byte_read_loc = ((memory_location+1)&0xff)+cpu.r.d,
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high_byte_loc = cpu.mmu.read_byte_long(high_byte_read_loc, 0);
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ORA_const.execute(cpu, [cpu.mmu.read_byte((high_byte_loc<<8) |
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low_byte_loc)]);
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} else if(cpu.p.m) {
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var memory_location = bytes[0] + cpu.r.d + cpu.r.x,
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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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ORA_const.execute(cpu, [cpu.mmu.read_byte((high_byte_loc<<8) |
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low_byte_loc)]);
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} else {
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var memory_location = bytes[0] + cpu.r.d + cpu.r.x,
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absolute_location = cpu.mmu.read_word(memory_location),
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low_byte = cpu.mmu.read_byte(absolute_location),
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high_byte;
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absolute_location++;
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if(absolute_location&0x10000) {
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high_byte = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
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} else {
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high_byte = cpu.mmu.read_byte(absolute_location);
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}
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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_long = {
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var ORA_direct_page_indirect_long = {
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bytes_required:function() {
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bytes_required:function() {
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@ -1712,44 +1679,8 @@ 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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var AND_direct_page_indirect =
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new cpu_lib.addressing.Direct_page_indirect(AND_const);
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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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var AND_direct_page_indexed_x_indirect =
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bytes_required:function() {
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new cpu_lib.addressing.Direct_page_indexed_x_indirect(AND_const);
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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+=4;
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if((cpu.r.d&0xff)!==0)
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cpu.cycle_count++;
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if(cpu.p.e) {
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var memory_location = (bytes[0] + cpu.r.x) & 0xff,
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low_byte_loc = cpu.mmu.read_byte_long(memory_location+cpu.r.d, 0),
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high_byte_read_loc = ((memory_location+1)&0xff)+cpu.r.d,
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high_byte_loc = cpu.mmu.read_byte_long(high_byte_read_loc, 0);
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AND_const.execute(cpu, [cpu.mmu.read_byte((high_byte_loc<<8) |
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low_byte_loc)]);
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} else if(cpu.p.m) {
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var memory_location = bytes[0] + cpu.r.d + cpu.r.x,
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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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AND_const.execute(cpu, [cpu.mmu.read_byte((high_byte_loc<<8)|
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low_byte_loc)]);
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} else {
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var memory_location = bytes[0] + cpu.r.d + cpu.r.x,
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absolute_location = cpu.mmu.read_word(memory_location),
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low_byte = cpu.mmu.read_byte(absolute_location),
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high_byte;
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absolute_location++;
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if(absolute_location&0x10000) {
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high_byte = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
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} else {
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high_byte = cpu.mmu.read_byte(absolute_location);
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}
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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_long = {
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var AND_direct_page_indirect_long = {
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bytes_required:function() {
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bytes_required:function() {
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@ -1978,43 +1909,8 @@ var CMP_direct_page_indexed_x =
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var CMP_direct_page_indirect =
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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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new cpu_lib.addressing.Direct_page_indirect(CMP_const);
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var CMP_direct_page_indexed_x_indirect = {
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var CMP_direct_page_indexed_x_indirect =
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bytes_required:function() {
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new cpu_lib.addressing.Direct_page_indexed_x_indirect(CMP_const);
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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+=4;
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if((cpu.r.d&0xff)!==0)
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cpu.cycle_count++;
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if(cpu.p.e) {
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var memory_location = (bytes[0] + cpu.r.x) & 0xff,
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low_byte_loc = cpu.mmu.read_byte_long(memory_location+cpu.r.d, 0),
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high_byte_read_loc = ((memory_location+1)&0xff)+cpu.r.d,
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high_byte_loc = cpu.mmu.read_byte_long(high_byte_read_loc, 0);
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CMP_const.execute(cpu, [cpu.mmu.read_byte((high_byte_loc<<8) |
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low_byte_loc)]);
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} else if(cpu.p.m) {
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var memory_location = bytes[0] + cpu.r.d + cpu.r.x,
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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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CMP_const.execute(cpu, [cpu.mmu.read_byte((high_byte_loc<<8)|
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low_byte_loc)]);
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} else {
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var memory_location = bytes[0] + cpu.r.d + cpu.r.x,
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absolute_location = cpu.mmu.read_word(memory_location)+1,
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low_byte = cpu.mmu.read_byte(absolute_location),
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high_byte;
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if(absolute_location&0x10000) {
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high_byte = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
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} else {
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high_byte = cpu.mmu.read_byte(absolute_location);
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}
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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_long = {
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var CMP_direct_page_indirect_long = {
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bytes_required:function() {
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bytes_required:function() {
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@ -2249,44 +2145,8 @@ var SBC_absolute_long = new cpu_lib.addressing.Absolute_long(SBC_const);
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var SBC_absolute_long_indexed_x =
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var SBC_absolute_long_indexed_x =
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new cpu_lib.addressing.Absolute_long_indexed_x(SBC_const);
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new cpu_lib.addressing.Absolute_long_indexed_x(SBC_const);
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var SBC_direct_page_indexed_x_indirect = {
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var SBC_direct_page_indexed_x_indirect =
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bytes_required:function() {
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new cpu_lib.addressing.Direct_page_indexed_x_indirect(SBC_const);
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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+=4;
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if((cpu.r.d&0xff)!==0)
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cpu.cycle_count++;
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if(cpu.p.e) {
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var memory_location = (bytes[0] + cpu.r.x) & 0xff,
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low_byte_loc = cpu.mmu.read_byte_long(memory_location+cpu.r.d, 0),
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high_byte_read_loc = ((memory_location+1)&0xff)+cpu.r.d,
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high_byte_loc = cpu.mmu.read_byte_long(high_byte_read_loc, 0);
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SBC_const.execute(cpu, [cpu.mmu.read_byte((high_byte_loc<<8) |
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low_byte_loc)]);
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} else if(cpu.p.m) {
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var memory_location = bytes[0] + cpu.r.d + cpu.r.x,
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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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SBC_const.execute(cpu, [cpu.mmu.read_byte((high_byte_loc<<8) |
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low_byte_loc)]);
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} else {
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var memory_location = bytes[0] + cpu.r.d + cpu.r.x,
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absolute_location = cpu.mmu.read_word(memory_location),
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low_byte = cpu.mmu.read_byte(absolute_location),
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high_byte;
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absolute_location++;
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if(absolute_location&0x10000) {
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high_byte = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
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} else {
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high_byte = cpu.mmu.read_byte(absolute_location);
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}
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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_long = {
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var SBC_direct_page_indirect_long = {
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bytes_required:function() {
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bytes_required:function() {
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@ -2511,44 +2371,8 @@ 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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var ADC_direct_page_indirect =
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new cpu_lib.addressing.Direct_page_indirect(ADC_const);
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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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var ADC_direct_page_indexed_x_indirect =
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bytes_required:function() {
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new cpu_lib.addressing.Direct_page_indexed_x_indirect(ADC_const);
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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+=5;
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else
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cpu.cycle_count+=4;
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if(cpu.p.e) {
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var memory_location = (bytes[0] + cpu.r.x) & 0xff,
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low_byte_loc = cpu.mmu.read_byte_long(memory_location+cpu.r.d, 0),
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high_byte_read_loc = ((memory_location+1)&0xff)+cpu.r.d,
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high_byte_loc = cpu.mmu.read_byte_long(high_byte_read_loc, 0);
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ADC_const.execute(cpu, [cpu.mmu.read_byte((high_byte_loc<<8) |
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low_byte_loc)]);
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} else if(cpu.p.m) {
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var memory_location = bytes[0] + cpu.r.d + cpu.r.x,
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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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ADC_const.execute(cpu, [cpu.mmu.read_byte((high_byte_loc<<8) |
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low_byte_loc)]);
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} else {
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||||||
var memory_location = bytes[0] + cpu.r.d + cpu.r.x,
|
|
||||||
absolute_location = cpu.mmu.read_word(memory_location),
|
|
||||||
low_byte = cpu.mmu.read_byte(absolute_location),
|
|
||||||
high_byte;
|
|
||||||
absolute_location++;
|
|
||||||
if(absolute_location&0x10000) {
|
|
||||||
high_byte = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
|
|
||||||
} else {
|
|
||||||
high_byte = cpu.mmu.read_byte(absolute_location);
|
|
||||||
}
|
|
||||||
ADC_const.execute(cpu, [low_byte, high_byte]);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
};
|
|
||||||
|
|
||||||
var ADC_direct_page_indirect_long_indexed_y = {
|
var ADC_direct_page_indirect_long_indexed_y = {
|
||||||
bytes_required:function() {
|
bytes_required:function() {
|
||||||
|
@ -3477,46 +3301,8 @@ var STA_stack_relative_indirect_indexed_y = {
|
||||||
}
|
}
|
||||||
};
|
};
|
||||||
|
|
||||||
var LDA_direct_page_indexed_x_indirect = {
|
var LDA_direct_page_indexed_x_indirect =
|
||||||
bytes_required:function() {
|
new cpu_lib.addressing.Direct_page_indexed_x_indirect(LDA_const);
|
||||||
return 2;
|
|
||||||
},
|
|
||||||
execute:function(cpu, bytes) {
|
|
||||||
cpu.cycle_count+=6;
|
|
||||||
|
|
||||||
if((cpu.r.d&0xff)!==0)
|
|
||||||
cpu.cycle_count++;
|
|
||||||
|
|
||||||
if(cpu.p.e) {
|
|
||||||
var memory_location = (bytes[0] + cpu.r.x) & 0xff,
|
|
||||||
low_byte_loc = cpu.mmu.read_byte_long(memory_location+cpu.r.d, 0),
|
|
||||||
high_byte_read_loc = ((memory_location+1)&0xff)+cpu.r.d,
|
|
||||||
high_byte_loc = cpu.mmu.read_byte_long(high_byte_read_loc, 0);
|
|
||||||
cpu.r.a = cpu.mmu.read_byte((high_byte_loc<<8) | low_byte_loc);
|
|
||||||
cpu.p.n = cpu.r.a >> 7;
|
|
||||||
} else if(cpu.p.m) {
|
|
||||||
var memory_location = bytes[0] + cpu.r.d + cpu.r.x;
|
|
||||||
cpu.r.a = cpu.mmu.read_byte(cpu.mmu.read_word(memory_location));
|
|
||||||
cpu.p.n = cpu.r.a >> 7;
|
|
||||||
} else {
|
|
||||||
cpu.cycle_count++;
|
|
||||||
|
|
||||||
var memory_location = bytes[0] + cpu.r.d + cpu.r.x,
|
|
||||||
absolute_location = cpu.mmu.read_word(memory_location),
|
|
||||||
low_byte = cpu.mmu.read_byte(absolute_location),
|
|
||||||
high_byte;
|
|
||||||
absolute_location++;
|
|
||||||
if(absolute_location&0x10000) {
|
|
||||||
high_byte = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
|
|
||||||
} else {
|
|
||||||
high_byte = cpu.mmu.read_byte(absolute_location);
|
|
||||||
}
|
|
||||||
cpu.r.a = (high_byte<<8) | low_byte;
|
|
||||||
cpu.p.n = cpu.r.a >> 15;
|
|
||||||
}
|
|
||||||
cpu_lib.r.p.check_z(cpu, cpu.r.a);
|
|
||||||
}
|
|
||||||
};
|
|
||||||
|
|
||||||
var LDA_direct_page_indirect_long = {
|
var LDA_direct_page_indirect_long = {
|
||||||
bytes_required:function() {
|
bytes_required:function() {
|
||||||
|
|
Loading…
Reference in New Issue