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Groundwork laid for upcoming BACKTRACK support

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This commit is contained in:
Jeff Parsons 2014-12-23 16:02:41 -08:00 • committed by jeffpar
commit 2034428e9f
17 changed files with 5524 additions and 3147 deletions
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8
modules/pcjs/lib/x86opxx.js
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@ -1650,13 +1650,13 @@ var X86OpXX = {
*
* To be clear, a single assignment like this will fail:
*
* opModeRegByteF2: function(fn) {
* opModsRegByteF2: function(fn) {
* this.regDX = (this.regDX & 0xff) | (fn.call(this, this.regDX >> 8, this.regDX & 0xff) << 8);
* }
*
* which is why all affected decoders now use separate assignments; eg:
*
* opModeRegByteF2: function(fn) {
* opModsRegByteF2: function(fn) {
* var b = fn.call(this, this.regDX >> 8, this.regDX & 0xff);
* this.regDX = (this.regDX & 0xff) | (b << 8);
* }
@ -3225,7 +3225,7 @@ var X86OpXX = {
* 0xF6 0xE0: MUL AL
* 0xF6 0xE4: MUL AH
*
* because the OpModeGrpByte decoder function will attempt to put the opGrpMULb() function's
* because the OpModsGrpByte decoder function will attempt to put the opGrpMULb() function's
* return value back into AL or AH, undoing opGrpMULb's update of AX. And since opGrpMULb doesn't
* know what the target is (only the target's value), it cannot easily work around the problem.
*
@ -3251,7 +3251,7 @@ var X86OpXX = {
* 0xF7 0xE0: MUL AX
* 0xF7 0xE2: MUL DX
*
* because the OpModeGrpWord decoder function will attempt to put the opGrpMULw() function's
* because the OpModsGrpWord decoder function will attempt to put the opGrpMULw() function's
* return value back into AX or DX, undoing opGrpMULw's update of DX:AX. And since opGrpMULw doesn't
* know what the target is (only the target's value), it cannot easily work around the problem.
*