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65816.js
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move common addressing functionality for absolute long to cpu_lib and use that as the basis for instructions that utilize that addressing mode

This commit is contained in:
Preston Skupinski 2011-12-31 17:59:26 -05:00
parent 9398885bc2
commit a29ee2fb7c
1 changed files with 27 additions and 123 deletions
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150
cpu.js
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@ -87,6 +87,26 @@ var cpu_lib = {
}
};
},
Absolute_long: function(instruction) {
this.bytes_required = function() {
return 4;
};
this.execute = function(cpu, bytes) {
cpu.cycle_count+=3;
var memory_location = (bytes[1]<<8)|bytes[0];
if(cpu.p.e||cpu.p.m) {
instruction.execute(cpu, [cpu.mmu.read_byte_long(memory_location,
bytes[2])]);
} else {
instruction.execute(cpu, [cpu.mmu.read_byte_long(memory_location,
bytes[2]),
cpu.mmu.read_byte_long(memory_location+1,
bytes[2])]);
}
};
},
Absolute_indexed_x: function(absolute_instruction, other) {
this.bytes_required = function() {
return 3;
@ -1306,23 +1326,7 @@ var EOR_const = {
var EOR_absolute = new cpu_lib.addressing.Absolute(EOR_const);
var EOR_absolute_long = {
bytes_required:function() {
return 4;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=3;
var memory_location = (bytes[1]<<8)|bytes[0];
if(cpu.p.e||cpu.p.m) {
EOR_const.execute(cpu, [cpu.mmu.read_byte_long(memory_location, bytes[2])]);
} else {
var low_byte = cpu.mmu.read_byte_long(memory_location, bytes[2]),
high_byte = cpu.mmu.read_byte_long(memory_location+1, bytes[2]);
EOR_const.execute(cpu, [low_byte, high_byte]);
}
}
};
var EOR_absolute_long = new cpu_lib.addressing.Absolute_long(EOR_const);
var EOR_absolute_long_indexed_x = {
bytes_required:function() {
@ -1521,24 +1525,7 @@ var ORA_const = {
var ORA_absolute = new cpu_lib.addressing.Absolute(ORA_const);
var ORA_absolute_long = {
bytes_required:function() {
return 4;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=3;
var memory_location = (bytes[1]<<8)|bytes[0];
if(cpu.p.e||cpu.p.m) {
ORA_const.execute(cpu, [cpu.mmu.read_byte_long(memory_location,
bytes[2])]);
} else {
var low_byte = cpu.mmu.read_byte_long(memory_location, bytes[2]),
high_byte = cpu.mmu.read_byte_long(memory_location+1, bytes[2]);
ORA_const.execute(cpu, [low_byte, high_byte]);
}
}
};
var ORA_absolute_long = new cpu_lib.addressing.Absolute_long(ORA_const);
var ORA_absolute_long_indexed_x = {
bytes_required:function() {
@ -1736,23 +1723,7 @@ var AND_const = {
var AND_absolute = new cpu_lib.addressing.Absolute(AND_const);
var AND_absolute_long = {
bytes_required:function() {
return 4;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=3;
var memory_location = (bytes[1]<<8)|bytes[0];
if(cpu.p.e||cpu.p.m) {
AND_const.execute(cpu, [cpu.mmu.read_byte_long(memory_location, bytes[2])]);
} else {
var low_byte = cpu.mmu.read_byte_long(memory_location, bytes[2]),
high_byte = cpu.mmu.read_byte_long(memory_location+1, bytes[2]);
AND_const.execute(cpu, [low_byte, high_byte]);
}
}
};
var AND_absolute_long = new cpu_lib.addressing.Absolute_long(AND_const);
var AND_absolute_long_indexed_x = {
bytes_required:function() {
@ -2177,24 +2148,7 @@ var CMP_direct_page_indirect_indexed_y = {
var CMP_absolute = new cpu_lib.addressing.Absolute(CMP_const);
var CMP_absolute_long = {
bytes_required:function() {
return 4;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=3;
var memory_location = (bytes[1]<<8)|bytes[0];
if(cpu.p.e||cpu.p.m) {
CMP_const.execute(cpu, [cpu.mmu.read_byte_long(memory_location,
bytes[2])]);
} else {
var low_byte = cpu.mmu.read_byte_long(memory_location, bytes[2]),
high_byte = cpu.mmu.read_byte_long(memory_location+1, bytes[2]);
CMP_const.execute(cpu, [low_byte, high_byte]);
}
}
};
var CMP_absolute_long = new cpu_lib.addressing.Absolute_long(CMP_const);
var CMP_absolute_long_indexed_x = {
bytes_required:function() {
@ -2361,23 +2315,7 @@ var SBC_direct_page = new cpu_lib.addressing.Direct_page(SBC_const);
var SBC_absolute = new cpu_lib.addressing.Absolute(SBC_const);
var SBC_absolute_long = {
bytes_required:function() {
return 4;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=3;
var memory_location = (bytes[1]<<8)|bytes[0];
if(cpu.p.e||cpu.p.m) {
SBC_const.execute(cpu, [cpu.mmu.read_byte_long(memory_location, bytes[2])]);
} else {
var low_byte = cpu.mmu.read_byte_long(memory_location, bytes[2]),
high_byte = cpu.mmu.read_byte_long(memory_location+1, bytes[2]);
SBC_const.execute(cpu, [low_byte, high_byte]);
}
}
};
var SBC_absolute_long = new cpu_lib.addressing.Absolute_long(SBC_const);
var SBC_absolute_long_indexed_x = {
bytes_required:function() {
@ -2658,22 +2596,7 @@ var ADC_const = {
var ADC_absolute = new cpu_lib.addressing.Absolute(ADC_const);
var ADC_absolute_long = {
bytes_required:function() {
return 4;
},
execute:function(cpu, bytes) {
var memory_location = (bytes[1]<<8)|bytes[0];
cpu.cycle_count+=3;
if(cpu.p.e||cpu.p.m) {
ADC_const.execute(cpu, [cpu.mmu.read_byte_long(memory_location, bytes[2])]);
} else {
var low_byte = cpu.mmu.read_byte_long(memory_location, bytes[2]),
high_byte = cpu.mmu.read_byte_long(memory_location+1, bytes[2]);
ADC_const.execute(cpu, [low_byte, high_byte]);
}
}
};
var ADC_absolute_long = new cpu_lib.addressing.Absolute_long(ADC_const);
var ADC_absolute_long_indexed_x = {
bytes_required:function() {
@ -4676,26 +4599,7 @@ var LDA_stack_relative_indirect_indexed_y =
var LDX_absolute_indexed_y =
new cpu_lib.addressing.Absolute_indexed_y(LDX_absolute);
var LDA_absolute_long = {
bytes_required: function() {
return 4;
},
execute: function(cpu, bytes) {
cpu.cyclce_count+=5;
var memory_location = (bytes[1]<<8)|bytes[0];
if(cpu.p.e||cpu.p.m) {
cpu.r.a = cpu.mmu.read_byte_long(memory_location, bytes[2]);
cpu.p.n = cpu.r.a >> 7;
} else {
cpu.cycle_count++;
cpu.r.a = cpu.mmu.read_word_long(memory_location, bytes[2]);
cpu.p.n = cpu.r.a >> 15;
}
cpu_lib.r.p.check_z(cpu, cpu.r.a);
}
};
var LDA_absolute_long = new cpu_lib.addressing.Absolute_long(LDA_const);
var LDA_absolute_long_indexed_x = {
bytes_required:function() {