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65816.js
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move common addressing functionality for direct page indirect 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 18:52:52 -05:00
parent 664bf85268
commit 10d0ee341b
1 changed files with 39 additions and 165 deletions
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204
cpu.js
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@ -109,6 +109,31 @@ var cpu_lib = {
}
};
},
Direct_page_indirect_long: function(instruction) {
this.bytes_required = function() {
return 2;
};
this.execute = function(cpu, bytes) {
cpu.cycle_count+=4;
if((cpu.r.d&0xff)!==0)
cpu.cycle_count++;
var memory_location = bytes[0] + cpu.r.d,
bank_byte = cpu.mmu.read_byte(memory_location+2),
absolute_location = cpu.mmu.read_word(memory_location);
if(cpu.p.e||cpu.p.m) {
instruction.execute(cpu, [cpu.mmu.read_byte_long(absolute_location,
bank_byte)]);
} else {
instruction.execute(cpu, [cpu.mmu.read_byte_long(absolute_location,
bank_byte),
cpu.mmu.read_byte_long(absolute_location+1,
bank_byte)]);
}
};
},
Absolute: function(instruction) {
this.bytes_required = function() {
return 3;
@ -1440,29 +1465,8 @@ var EOR_direct_page_indirect_long_indexed_y = {
}
};
var EOR_direct_page_indirect_long = {
bytes_required:function() {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=4;
if((cpu.r.d&0xff)!==0)
cpu.cycle_count++;
var memory_location = bytes[0] + cpu.r.d,
bank_byte = cpu.mmu.read_byte(memory_location+2),
absolute_location = cpu.mmu.read_word(memory_location);
if(cpu.p.e||cpu.p.m) {
EOR_const.execute(cpu, [cpu.mmu.read_byte_long(absolute_location,
bank_byte)]);
} else {
var low_byte = cpu.mmu.read_byte_long(absolute_location, bank_byte),
high_byte = cpu.mmu.read_byte_long(absolute_location+1, bank_byte);
EOR_const.execute(cpu, [low_byte, high_byte]);
}
}
};
var EOR_direct_page_indirect_long =
new cpu_lib.addressing.Direct_page_indirect_long(EOR_const);
var EOR_direct_page_indirect_indexed_y = {
bytes_required:function() {
@ -1545,29 +1549,8 @@ var ORA_direct_page_indirect =
var ORA_direct_page_indexed_x_indirect =
new cpu_lib.addressing.Direct_page_indexed_x_indirect(ORA_const);
var ORA_direct_page_indirect_long = {
bytes_required:function() {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=4;
if((cpu.r.d&0xff)!==0)
cpu.cycle_count++;
var memory_location = bytes[0] + cpu.r.d,
bank_byte = cpu.mmu.read_byte(memory_location+2),
absolute_location = cpu.mmu.read_word(memory_location);
if(cpu.p.e||cpu.p.m) {
ORA_const.execute(cpu, [cpu.mmu.read_byte_long(absolute_location,
bank_byte)]);
} else {
var low_byte = cpu.mmu.read_byte_long(absolute_location, bank_byte),
high_byte = cpu.mmu.read_byte_long(absolute_location+1, bank_byte);
ORA_const.execute(cpu, [low_byte, high_byte]);
}
}
};
var ORA_direct_page_indirect_long =
new cpu_lib.addressing.Direct_page_indirect_long(ORA_const);
var ORA_direct_page_indirect_long_indexed_y = {
bytes_required:function() {
@ -1682,29 +1665,8 @@ var AND_direct_page_indirect =
var AND_direct_page_indexed_x_indirect =
new cpu_lib.addressing.Direct_page_indexed_x_indirect(AND_const);
var AND_direct_page_indirect_long = {
bytes_required:function() {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=4;
if((cpu.r.d&0xff)!==0)
cpu.cycle_count++;
var memory_location = bytes[0] + cpu.r.d,
bank_byte = cpu.mmu.read_byte(memory_location+2),
absolute_location = cpu.mmu.read_word(memory_location);
if(cpu.p.e||cpu.p.m) {
AND_const.execute(cpu, [cpu.mmu.read_byte_long(absolute_location,
bank_byte)]);
} else {
var low_byte = cpu.mmu.read_byte_long(absolute_location, bank_byte);
var high_byte = cpu.mmu.read_byte_long(absolute_location+1, bank_byte);
AND_const.execute(cpu, [low_byte, high_byte]);
}
}
};
var AND_direct_page_indirect_long =
new cpu_lib.addressing.Direct_page_indirect_long(AND_const);
var AND_direct_page_indirect_long_indexed_y = {
bytes_required:function() {
@ -1912,29 +1874,8 @@ var CMP_direct_page_indirect =
var CMP_direct_page_indexed_x_indirect =
new cpu_lib.addressing.Direct_page_indexed_x_indirect(CMP_const);
var CMP_direct_page_indirect_long = {
bytes_required:function() {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=4;
if((cpu.r.d&0xff)!==0)
cpu.cycle_count++;
var memory_location = bytes[0] + cpu.r.d,
bank_byte = cpu.mmu.read_byte(memory_location+2),
absolute_location = cpu.mmu.read_word(memory_location);
if(cpu.p.e||cpu.p.m) {
CMP_const.execute(cpu, [cpu.mmu.read_byte_long(absolute_location,
bank_byte)]);
} else {
var low_byte = cpu.mmu.read_byte_long(absolute_location, bank_byte),
high_byte = cpu.mmu.read_byte_long(absolute_location+1, bank_byte);
CMP_const.execute(cpu, [low_byte, high_byte]);
}
}
};
var CMP_direct_page_indirect_long =
new cpu_lib.addressing.Direct_page_indirect_long(CMP_const);
var CMP_direct_page_indirect_long_indexed_y = {
bytes_required:function() {
@ -2148,29 +2089,8 @@ var SBC_absolute_long_indexed_x =
var SBC_direct_page_indexed_x_indirect =
new cpu_lib.addressing.Direct_page_indexed_x_indirect(SBC_const);
var SBC_direct_page_indirect_long = {
bytes_required:function() {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=4;
if((cpu.r.d&0xff)!==0)
cpu.cycle_count++;
var memory_location = bytes[0] + cpu.r.d,
bank_byte = cpu.mmu.read_byte(memory_location+2),
absolute_location = cpu.mmu.read_word(memory_location);
if(cpu.p.e||cpu.p.m) {
SBC_const.execute(cpu, [cpu.mmu.read_byte_long(absolute_location,
bank_byte)]);
} else {
var low_byte = cpu.mmu.read_byte_long(absolute_location, bank_byte),
high_byte = cpu.mmu.read_byte_long(absolute_location+1, bank_byte);
SBC_const.execute(cpu, [low_byte, high_byte]);
}
}
};
var SBC_direct_page_indirect_long =
new cpu_lib.addressing.Direct_page_indirect_long(SBC_const);
var SBC_direct_page_indirect_long_indexed_y = {
bytes_required:function() {
@ -2407,29 +2327,8 @@ var ADC_direct_page_indirect_long_indexed_y = {
}
};
var ADC_direct_page_indirect_long = {
bytes_required:function() {
return 2;
},
execute:function(cpu, bytes) {
if((cpu.r.d&0x00ff)!==0)
cpu.cycle_count+=5;
else
cpu.cycle_count+=4;
var memory_location = bytes[0] + cpu.r.d,
bank_byte = cpu.mmu.read_byte(memory_location+2),
absolute_location = cpu.mmu.read_word(memory_location);
if(cpu.p.e||cpu.p.m) {
ADC_const.execute(cpu, [cpu.mmu.read_byte_long(absolute_location,
bank_byte)]);
} else {
var low_byte = cpu.mmu.read_byte_long(absolute_location, bank_byte),
high_byte = cpu.mmu.read_byte_long(absolute_location+1, bank_byte);
ADC_const.execute(cpu, [low_byte, high_byte]);
}
}
};
var ADC_direct_page_indirect_long =
new cpu_lib.addressing.Direct_page_indirect_long(ADC_const);
var ADC_direct_page_indirect_indexed_y = {
bytes_required:function() {
@ -3304,33 +3203,8 @@ var STA_stack_relative_indirect_indexed_y = {
var LDA_direct_page_indexed_x_indirect =
new cpu_lib.addressing.Direct_page_indexed_x_indirect(LDA_const);
var LDA_direct_page_indirect_long = {
bytes_required:function() {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=6;
if((cpu.r.d&0xff)!==0)
cpu.cycle_count++;
var memory_location = bytes[0] + cpu.r.d,
bank_byte = cpu.mmu.read_byte(memory_location+2),
absolute_location = cpu.mmu.read_word(memory_location);
if(cpu.p.e||cpu.p.m) {
cpu.r.a = cpu.mmu.read_byte_long(absolute_location,
bank_byte);
cpu.p.n = cpu.r.a >> 7;
} else {
cpu.cycle_count++;
cpu.r.a = cpu.mmu.read_word_long(absolute_location, bank_byte);
cpu.p.n = cpu.r.a >> 15;
}
cpu_lib.r.p.check_z(cpu, cpu.r.a);
}
};
var LDA_direct_page_indirect_long =
new cpu_lib.addressing.Direct_page_indirect_long(LDA_const);
var LDA_direct_page_indirect_long_indexed_y = {
bytes_required:function() {