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65816.js
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move common addressing functionality for absolute long indexed x 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 18:17:19 -05:00
parent a29ee2fb7c
commit 23bedf5ce7
1 changed files with 43 additions and 192 deletions
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235
cpu.js
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@ -107,6 +107,35 @@ var cpu_lib = {
}
};
},
Absolute_long_indexed_x: 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]) + cpu.r.x;
if(memory_location & 0x10000) {
bytes[2]++;
memory_location &= 0xffff;
}
if(cpu.p.e||cpu.p.m) {
instruction.execute(cpu, [cpu.mmu.read_byte_long(memory_location,
bytes[2])]);
} else {
var low_byte = cpu.mmu.read_byte_long(memory_location, bytes[2]);
memory_location++;
if(memory_location & 0x10000) {
bytes[2]++;
memory_location &= 0xffff;
}
var high_byte = cpu.mmu.read_byte_long(memory_location, bytes[2]);
instruction.execute(cpu, [low_byte, high_byte]);
}
};
},
Absolute_indexed_x: function(absolute_instruction, other) {
this.bytes_required = function() {
return 3;
@ -1328,33 +1357,8 @@ var EOR_absolute = new cpu_lib.addressing.Absolute(EOR_const);
var EOR_absolute_long = new cpu_lib.addressing.Absolute_long(EOR_const);
var EOR_absolute_long_indexed_x = {
bytes_required:function() {
return 4;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=3;
var memory_location = ((bytes[1]<<8)|bytes[0]) + cpu.r.x;
if(memory_location & 0x10000) {
bytes[2]++;
memory_location &= 0xffff;
}
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]);
memory_location++;
if(memory_location & 0x10000) {
bytes[2]++;
memory_location &= 0xffff;
}
var high_byte = cpu.mmu.read_byte_long(memory_location, bytes[2]);
EOR_const.execute(cpu, [low_byte, high_byte]);
}
}
};
var EOR_absolute_long_indexed_x =
new cpu_lib.addressing.Absolute_long_indexed_x(EOR_const);
var EOR_direct_page = new cpu_lib.addressing.Direct_page(EOR_const);
@ -1527,33 +1531,8 @@ var ORA_absolute = new cpu_lib.addressing.Absolute(ORA_const);
var ORA_absolute_long = new cpu_lib.addressing.Absolute_long(ORA_const);
var ORA_absolute_long_indexed_x = {
bytes_required:function() {
return 4;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=3;
var memory_location = ((bytes[1]<<8)|bytes[0]) + cpu.r.x;
if(memory_location & 0x10000) {
bytes[2]++;
memory_location &= 0xffff;
}
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]);
memory_location++;
if(memory_location & 0x10000) {
bytes[2]++;
memory_location &= 0xffff;
}
var high_byte = cpu.mmu.read_byte_long(memory_location, bytes[2]);
ORA_const.execute(cpu, [low_byte, high_byte]);
}
}
};
var ORA_absolute_long_indexed_x =
new cpu_lib.addressing.Absolute_long_indexed_x(ORA_const);
var ORA_direct_page = new cpu_lib.addressing.Direct_page(ORA_const);
@ -1725,33 +1704,8 @@ var AND_absolute = new cpu_lib.addressing.Absolute(AND_const);
var AND_absolute_long = new cpu_lib.addressing.Absolute_long(AND_const);
var AND_absolute_long_indexed_x = {
bytes_required:function() {
return 4;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=3;
var memory_location = ((bytes[1]<<8)|bytes[0]) + cpu.r.x;
if(memory_location & 0x10000) {
bytes[2]++;
memory_location &= 0xffff;
}
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]);
memory_location++;
if(memory_location & 0x10000) {
bytes[2]++;
memory_location &= 0xffff;
}
var high_byte = cpu.mmu.read_byte_long(memory_location, bytes[2]);
AND_const.execute(cpu, [low_byte, high_byte]);
}
}
};
var AND_absolute_long_indexed_x =
new cpu_lib.addressing.Absolute_long_indexed_x(AND_const);
var AND_direct_page = new cpu_lib.addressing.Direct_page(AND_const);
@ -2150,33 +2104,8 @@ var CMP_absolute = new cpu_lib.addressing.Absolute(CMP_const);
var CMP_absolute_long = new cpu_lib.addressing.Absolute_long(CMP_const);
var CMP_absolute_long_indexed_x = {
bytes_required:function() {
return 4;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=5;
var memory_location = ((bytes[1]<<8)|bytes[0]) + cpu.r.x;
if(memory_location & 0x10000) {
bytes[2]++;
memory_location &= 0xffff;
}
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]);
memory_location++;
if(memory_location & 0x10000) {
bytes[2]++;
memory_location &= 0xffff;
}
var high_byte = cpu.mmu.read_byte_long(memory_location, bytes[2]);
CMP_const.execute(cpu, [low_byte, high_byte]);
}
}
};
var CMP_absolute_long_indexed_x =
new cpu_lib.addressing.Absolute_long_indexed_x(CMP_const);
var CMP_absolute_indexed_x =
new cpu_lib.addressing.Absolute_indexed_x(CMP_absolute);
@ -2317,32 +2246,8 @@ var SBC_absolute = new cpu_lib.addressing.Absolute(SBC_const);
var SBC_absolute_long = new cpu_lib.addressing.Absolute_long(SBC_const);
var SBC_absolute_long_indexed_x = {
bytes_required:function() {
return 4;
},
execute:function(cpu, bytes) {
cpu.cyle_count+=3;
var memory_location = ((bytes[1]<<8)|bytes[0]) + cpu.r.x;
if(memory_location & 0x10000) {
bytes[2]++;
memory_location &= 0xffff;
}
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]);
memory_location++;
if(memory_location & 0x10000) {
bytes[2]++;
}
var high_byte = cpu.mmu.read_byte_long(memory_location, bytes[2]);
SBC_const.execute(cpu, [low_byte, high_byte]);
}
}
};
var SBC_absolute_long_indexed_x =
new cpu_lib.addressing.Absolute_long_indexed_x(SBC_const);
var SBC_direct_page_indexed_x_indirect = {
bytes_required:function() {
@ -2598,32 +2503,8 @@ var ADC_absolute = new cpu_lib.addressing.Absolute(ADC_const);
var ADC_absolute_long = new cpu_lib.addressing.Absolute_long(ADC_const);
var ADC_absolute_long_indexed_x = {
bytes_required:function() {
return 4;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=3;
var memory_location = ((bytes[1]<<8)|bytes[0]) + cpu.r.x;
if(memory_location & 0x10000) {
bytes[2]++;
memory_location &= 0xffff;
}
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]);
memory_location++;
if(memory_location & 0x10000) {
bytes[2]++;
}
var high_byte = cpu.mmu.read_byte_long(memory_location, bytes[2]);
ADC_const.execute(cpu, [low_byte, high_byte]);
}
}
};
var ADC_absolute_long_indexed_x =
new cpu_lib.addressing.Absolute_long_indexed_x(ADC_const);
var ADC_direct_page = new cpu_lib.addressing.Direct_page(ADC_const);
@ -4601,38 +4482,8 @@ var LDX_absolute_indexed_y =
var LDA_absolute_long = new cpu_lib.addressing.Absolute_long(LDA_const);
var LDA_absolute_long_indexed_x = {
bytes_required:function() {
return 4;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=5;
var memory_location = ((bytes[1]<<8)|bytes[0]) + cpu.r.x;
if(memory_location & 0x10000) {
bytes[2]++;
memory_location &= 0xffff;
}
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++;
var low_byte = cpu.mmu.read_byte_long(memory_location, bytes[2]);
memory_location++;
if(memory_location & 0x10000) {
bytes[2]++;
memory_location &= 0xffff;
}
var high_byte = cpu.mmu.read_byte_long(memory_location, bytes[2]);
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_absolute_long_indexed_x =
new cpu_lib.addressing.Absolute_long_indexed_x(LDA_const);
var LDX_const = {
bytes_required: function(cpu) {