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65816.js
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added PHP and PLP

This commit is contained in:
Preston Skupinski 2011-05-08 23:46:22 -04:00
parent 9af3fe68ee
commit 98a058058f
1 changed files with 31 additions and 1 deletions
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32
cpu.js
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@ -124,7 +124,7 @@ function CPU_65816() {
0x7e : ROR_absolute_indexed_x,
0x76 : ROR_direct_page_indexed_x,
0x48 : PHA , 0x68 : PLA, 0x5a : PHY, 0x7a : PLY,
0xda : PHX, 0xfa : PLX };
0xda : PHX, 0xfa : PLX, 0x08 : PHP, 0x28 : PLP };
/**
* Take a raw hex string representing the program and execute it.
@ -203,6 +203,36 @@ var MMU = {
}
};
var PHP = {
bytes_required:function() {
return 1;
},
execute:function(cpu) {
// TODO: Handle emulation mode.
var p_byte = (cpu.p.n<<7)|(cpu.p.v<<6)|(cpu.p.m<<5)|(cpu.p.x<<4)|
(cpu.p.d<<3)|(cpu.p.i<<2)|(cpu.p.z<<1)|cpu.p.c;
cpu.mmu.store_byte(cpu.r.s--, p_byte);
}
};
var PLP = {
bytes_required:function() {
return 1;
},
execute:function(cpu) {
// TODO: Handle emulation mode.
var p_byte = cpu.mmu.read_byte(++cpu.r.s);
cpu.p.c = p_byte & 0x01;
cpu.p.z = (p_byte & 0x02) >> 1;
cpu.p.i = (p_byte & 0x04) >> 2;
cpu.p.d = (p_byte & 0x08) >> 3;
cpu.p.x = (p_byte & 0x10) >> 4;
cpu.p.m = (p_byte & 0x20) >> 5;
cpu.p.v = (p_byte & 0x40) >> 6;
cpu.p.n = p_byte >> 7;
}
};
var PHX = {
bytes_required:function() {
return 1;