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65816.js
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move common addressing functionality for stack relative indirect indexed y 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 17:21:24 -05:00
parent 1fd918801a
commit 0f73c71a7e
1 changed files with 71 additions and 377 deletions
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448
cpu.js
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@ -132,6 +132,62 @@ var cpu_lib = {
cpu.mmu.read_byte(memory_location+1)]);
}
};
},
Stack_relative_indirect_indexed_y: function(instruction) {
this.bytes_required = function() {
return 2;
};
this.execute = function(cpu, bytes) {
cpu.cycle_count+=5;
if(cpu.p.e) {
var location_loc = 0x100 | ((cpu.r.s + bytes[0]) & 0xff),
low_byte = cpu.mmu.read_byte(location_loc),
high_byte;
if(location_loc===0x1ff) {
high_byte = cpu.mmu.read_byte(0x100);
} else {
high_byte = cpu.mmu.read_byte(location_loc+1);
}
var absolute_location = ((high_byte<<8)|low_byte)+cpu.r.y,
b;
if(absolute_location>=0x10000) {
b = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
} else {
b = cpu.mmu.read_byte(absolute_location);
}
instruction.execute(cpu, [b]);
} else {
var location_loc = (cpu.r.s + bytes[0]) & 0xffff,
absolute_location = cpu.mmu.read_word(location_loc) + cpu.r.y;
if(cpu.p.m) {
var b;
if(absolute_location>=0x10000) {
b = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
} else {
b = cpu.mmu.read_byte(absolute_location);
}
instruction.execute(cpu, [b]);
} else {
var low_byte, high_byte;
if(absolute_location>=0x10000) {
absolute_location &= 0xffff;
low_byte = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
high_byte = cpu.mmu.read_byte_long(absolute_location+1,
cpu.r.dbr+1);
} else {
low_byte = cpu.mmu.read_byte(absolute_location);
if(absolute_location===0xffff) {
high_byte = cpu.mmu.read_byte_long(0, cpu.r.dbr+1);
} else {
high_byte = cpu.mmu.read_byte(absolute_location);
}
}
instruction.execute(cpu, [low_byte, high_byte]);
}
}
}
}
}
};
@ -1433,60 +1489,8 @@ var EOR_direct_page_indexed_x =
var EOR_stack_relative = new cpu_lib.addressing.Stack_relative(EOR_const);
var EOR_stack_relative_indirect_indexed_y = {
bytes_required:function() {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=5;
if(cpu.p.e) {
var location_loc = 0x100 | ((cpu.r.s + bytes[0]) & 0xff),
low_byte = cpu.mmu.read_byte(location_loc),
high_byte;
if(location_loc===0x1ff) {
high_byte = cpu.mmu.read_byte(0x100);
} else {
high_byte = cpu.mmu.read_byte(location_loc+1);
}
var absolute_location = ((high_byte<<8)|low_byte)+cpu.r.y,
b;
if(absolute_location>=0x10000) {
b = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
} else {
b = cpu.mmu.read_byte(absolute_location);
}
EOR_const.execute(cpu, [b]);
} else {
var location_loc = (cpu.r.s + bytes[0]) & 0xffff,
absolute_location = cpu.mmu.read_word(location_loc) + cpu.r.y;
if(cpu.p.m) {
var b;
if(absolute_location>=0x10000) {
b = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
} else {
b = cpu.mmu.read_byte(absolute_location);
}
EOR_const.execute(cpu, [b]);
} else {
var low_byte, high_byte;
if(absolute_location>=0x10000) {
absolute_location &= 0xffff;
low_byte = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
high_byte = cpu.mmu.read_byte_long(absolute_location+1, cpu.r.dbr+1);
} else {
low_byte = cpu.mmu.read_byte(absolute_location);
if(absolute_location===0xffff) {
high_byte = cpu.mmu.read_byte_long(0, cpu.r.dbr+1);
} else {
high_byte = cpu.mmu.read_byte(absolute_location);
}
}
EOR_const.execute(cpu, [low_byte, high_byte]);
}
}
}
};
var EOR_stack_relative_indirect_indexed_y =
new cpu_lib.addressing.Stack_relative_indirect_indexed_y(EOR_const);
var ORA_const = {
bytes_required:function(cpu) {
@ -1719,60 +1723,8 @@ var ORA_direct_page_indexed_x =
var ORA_stack_relative = new cpu_lib.addressing.Stack_relative(ORA_const);
var ORA_stack_relative_indirect_indexed_y = {
bytes_required:function() {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=5;
if(cpu.p.e) {
var location_loc = 0x100 | ((cpu.r.s + bytes[0]) & 0xff),
low_byte = cpu.mmu.read_byte(location_loc),
high_byte;
if(location_loc===0x1ff) {
high_byte = cpu.mmu.read_byte(0x100);
} else {
high_byte = cpu.mmu.read_byte(location_loc+1);
}
var absolute_location = ((high_byte<<8)|low_byte)+cpu.r.y,
b;
if(absolute_location>=0x10000) {
b = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
} else {
b = cpu.mmu.read_byte(absolute_location);
}
ORA_const.execute(cpu, [b]);
} else {
var location_loc = (cpu.r.s + bytes[0]) & 0xffff,
absolute_location = cpu.mmu.read_word(location_loc);
absolute_location += cpu.r.y;
if(cpu.p.m) {
var b;
if(absolute_location>=0x10000) {
b = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
} else {
b = cpu.mmu.read_byte(absolute_location);
}
ORA_const.execute(cpu, [b]);
} else {
var low_byte, high_byte;
if(absolute_location>=0x10000) {
low_byte = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
high_byte = cpu.mmu.read_byte_long(absolute_location+1, cpu.r.dbr+1);
} else {
low_byte = cpu.mmu.read_byte(absolute_location);
if(absolute_location===0xffff) {
high_byte = cpu.mmu.read_byte_long(0, cpu.r.dbr+1);
} else {
high_byte = cpu.mmu.read_byte(absolute_location);
}
}
ORA_const.execute(cpu, [low_byte, high_byte]);
}
}
}
};
var ORA_stack_relative_indirect_indexed_y =
new cpu_lib.addressing.Stack_relative_indirect_indexed_y(ORA_const);
var AND_const = {
bytes_required:function(cpu) {
@ -2007,60 +1959,8 @@ var AND_direct_page_indexed_x =
var AND_stack_relative = new cpu_lib.addressing.Stack_relative(AND_const);
var AND_stack_relative_indirect_indexed_y = {
bytes_required:function() {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=5;
if(cpu.p.e) {
var location_loc = 0x100 | ((cpu.r.s + bytes[0]) & 0xff),
low_byte = cpu.mmu.read_byte(location_loc),
high_byte;
if(location_loc===0x1ff) {
high_byte = cpu.mmu.read_byte(0x100);
} else {
high_byte = cpu.mmu.read_byte(location_loc+1);
}
var absolute_location = ((high_byte<<8)|low_byte)+cpu.r.y,
b;
if(absolute_location>=0x10000) {
b = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
} else {
b = cpu.mmu.read_byte(absolute_location);
}
AND_const.execute(cpu, [b]);
} else {
var location_loc = cpu.r.s + bytes[0],
absolute_location = cpu.mmu.read_word(location_loc) + cpu.r.y;
if(cpu.p.m) {
var b;
if(absolute_location>=0x10000) {
b = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
} else {
b = cpu.mmu.read_byte(absolute_location);
}
AND_const.execute(cpu, [b]);
} else {
var low_byte, high_byte;
if(absolute_location>=0x10000) {
absolute_location &= 0xffff;
low_byte = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
high_byte = cpu.mmu.read_byte_long(absolute_location+1, cpu.r.dbr+1);
} else {
low_byte = cpu.mmu.read_byte(absolute_location);
if(absolute_location===0xffff) {
high_byte = cpu.mmu.read_byte_long(0, cpu.r.dbr+1);
} else {
high_byte = cpu.mmu.read_byte(absolute_location);
}
}
AND_const.execute(cpu, [low_byte, high_byte]);
}
}
}
};
var AND_stack_relative_indirect_indexed_y =
new cpu_lib.addressing.Stack_relative_indirect_indexed_y(AND_const);
var CPX_const = {
bytes_required:function(cpu) {
@ -2389,59 +2289,8 @@ var CMP_absolute_indexed_y =
var CMP_stack_relative = new cpu_lib.addressing.Stack_relative(CMP_const);
var CMP_stack_relative_indirect_indexed_y = {
bytes_required:function() {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=5;
if(cpu.p.e) {
var location_loc = 0x100 | ((cpu.r.s + bytes[0]) & 0xff),
low_byte = cpu.mmu.read_byte(location_loc),
high_byte;
if(location_loc===0x1ff) {
high_byte = cpu.mmu.read_byte(0x100);
} else {
high_byte = cpu.mmu.read_byte(location_loc+1);
}
var absolute_location = ((high_byte<<8)|low_byte)+cpu.r.y;
var b;
if(absolute_location>=0x10000) {
b = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
} else {
b = cpu.mmu.read_byte(absolute_location);
}
CMP_const.execute(cpu, [b]);
} else {
var location_loc = cpu.r.s + bytes[0],
absolute_location = cpu.mmu.read_word(location_loc) + cpu.r.y;
if(cpu.p.m) {
var b;
if(absolute_location>=0x10000) {
b = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
} else {
b = cpu.mmu.read_byte(absolute_location);
}
CMP_const.execute(cpu, [b]);
} else {
var low_byte, high_byte;
if(absolute_location>=0x10000) {
low_byte = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
high_byte = cpu.mmu.read_byte_long(absolute_location+1, cpu.r.dbr+1);
} else {
low_byte = cpu.mmu.read_byte(absolute_location);
if(absolute_location===0xffff) {
high_byte = cpu.mmu.read_byte_long(0, cpu.r.dbr+1);
} else {
high_byte = cpu.mmu.read_byte(absolute_location);
}
}
CMP_const.execute(cpu, [low_byte, high_byte]);
}
}
}
};
var CMP_stack_relative_indirect_indexed_y =
new cpu_lib.addressing.Stack_relative_indirect_indexed_y(CMP_const);
var SBC_const = {
bytes_required:function(cpu) {
@ -2769,59 +2618,8 @@ var SBC_direct_page_indirect = {
var SBC_stack_relative = new cpu_lib.addressing.Stack_relative(SBC_const);
var SBC_stack_relative_indirect_indexed_y = {
bytes_required:function() {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=5;
if(cpu.p.e) {
var location_loc = 0x100 | ((cpu.r.s + bytes[0]) & 0xff),
low_byte = cpu.mmu.read_byte(location_loc),
high_byte;
if(location_loc===0x1ff) {
high_byte = cpu.mmu.read_byte(0x100);
} else {
high_byte = cpu.mmu.read_byte(location_loc+1);
}
var absolute_location = ((high_byte<<8)|low_byte)+cpu.r.y,
b;
if(absolute_location>=0x10000) {
b = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
} else {
b = cpu.mmu.read_byte(absolute_location);
}
SBC_const.execute(cpu, [b]);
} else {
var location_loc = cpu.r.s + bytes[0],
absolute_location = cpu.mmu.read_word(location_loc) + cpu.r.y;
if(cpu.p.m) {
var b;
if(absolute_location>=0x10000) {
b = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
} else {
b = cpu.mmu.read_byte(absolute_location);
}
SBC_const.execute(cpu, [b]);
} else {
var low_byte, high_byte;
if(absolute_location>=0x10000) {
low_byte = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
high_byte = cpu.mmu.read_byte_long(absolute_location+1, cpu.r.dbr+1);
} else {
low_byte = cpu.mmu.read_byte(absolute_location);
if(absolute_location===0xffff) {
high_byte = cpu.mmu.read_byte_long(0, cpu.r.dbr+1);
} else {
high_byte = cpu.mmu.read_byte(absolute_location);
}
}
SBC_const.execute(cpu, [low_byte, high_byte]);
}
}
}
};
var SBC_stack_relative_indirect_indexed_y =
new cpu_lib.addressing.Stack_relative_indirect_indexed_y(SBC_const);
var ADC_const = {
bytes_required:function(cpu) {
@ -3139,59 +2937,8 @@ var ADC_direct_page_indexed_x =
var ADC_stack_relative = new cpu_lib.addressing.Stack_relative(ADC_const);
var ADC_stack_relative_indirect_indexed_y = {
bytes_required:function() {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=5;
if(cpu.p.e) {
var location_loc = 0x100 | ((cpu.r.s + bytes[0]) & 0xff),
low_byte = cpu.mmu.read_byte(location_loc),
high_byte;
if(location_loc===0x1ff) {
high_byte = cpu.mmu.read_byte(0x100);
} else {
high_byte = cpu.mmu.read_byte(location_loc+1);
}
var absolute_location = ((high_byte<<8)|low_byte)+cpu.r.y,
b;
if(absolute_location>=0x10000) {
b = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
} else {
b = cpu.mmu.read_byte(absolute_location);
}
ADC_const.execute(cpu, [b]);
} else {
var location_loc = cpu.r.s + bytes[0],
absolute_location = cpu.mmu.read_word(location_loc)+cpu.r.y;
if(cpu.p.m) {
var b;
if(absolute_location>=0x10000) {
b = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
} else {
b = cpu.mmu.read_byte(absolute_location);
}
ADC_const.execute(cpu, [b]);
} else {
var low_byte, high_byte;
if(absolute_location>=0x10000) {
low_byte = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
high_byte = cpu.mmu.read_byte_long(absolute_location+1, cpu.r.dbr+1);
} else {
low_byte = cpu.mmu.read_byte(absolute_location);
if(absolute_location===0xffff) {
high_byte = cpu.mmu.read_byte_long(0, cpu.r.dbr+1);
} else {
high_byte = cpu.mmu.read_byte(absolute_location);
}
}
ADC_const.execute(cpu, [low_byte, high_byte]);
}
}
}
};
var ADC_stack_relative_indirect_indexed_y =
new cpu_lib.addressing.Stack_relative_indirect_indexed_y(ADC_const);
var BMI = {
bytes_required:function() {
@ -4185,62 +3932,6 @@ var LDA_direct_page_indirect_indexed_y = {
}
};
var LDA_stack_relative_indirect_indexed_y = {
bytes_required:function() {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=7;
if(cpu.p.e) {
var location_loc = 0x100 | ((cpu.r.s + bytes[0]) & 0xff),
low_byte = cpu.mmu.read_byte(location_loc),
high_byte;
if(location_loc===0x1ff) {
high_byte = cpu.mmu.read_byte(0x100);
} else {
high_byte = cpu.mmu.read_byte(location_loc+1);
}
var absolute_location = ((high_byte<<8)|low_byte)+cpu.r.y,
b;
if(absolute_location>=0x10000) {
b = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
} else {
b = cpu.mmu.read_byte(absolute_location);
}
LDA_const.execute(cpu, [b]);
} else {
var location_loc = cpu.r.s + bytes[0],
absolute_location = cpu.mmu.read_word(location_loc)+cpu.r.y;
if(cpu.p.m) {
var b;
if(absolute_location>=0x10000) {
b = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
} else {
b = cpu.mmu.read_byte(absolute_location);
}
LDA_const.execute(cpu, [b]);
} else {
cpu.cycle_count++;
var low_byte, high_byte;
if(absolute_location>=0x10000) {
low_byte = cpu.mmu.read_byte_long(absolute_location, cpu.r.dbr+1);
high_byte = cpu.mmu.read_byte_long(absolute_location+1, cpu.r.dbr+1);
} else {
low_byte = cpu.mmu.read_byte(absolute_location);
if(absolute_location===0xffff) {
high_byte = cpu.mmu.read_byte_long(0, cpu.r.dbr+1);
} else {
high_byte = cpu.mmu.read_byte(absolute_location);
}
}
LDA_const.execute(cpu, [low_byte, high_byte]);
}
}
}
};
var NOP = {
bytes_required:function() {
return 1;
@ -5096,6 +4787,9 @@ var LDA_absolute_indexed_y =
var LDA_stack_relative = new cpu_lib.addressing.Stack_relative(LDA_const);
var LDA_stack_relative_indirect_indexed_y =
new cpu_lib.addressing.Stack_relative_indirect_indexed_y(LDA_const);
var LDX_absolute_indexed_y =
new cpu_lib.addressing.Absolute_indexed_y(LDX_absolute);