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Factored common RETF logic into opHelpRETF

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Jeff Parsons 2014-12-01 14:50:38 -08:00 • committed by jeffpar
commit d628eacfc6
5 changed files with 72 additions and 37 deletions
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8
modules/pcjs/lib/x86cpu.js
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@ -518,7 +518,7 @@ X86CPU.prototype.setAddressMask = function(addrMask)
* Microprocessor, March 1983" (pp.55-56). "The iAPX 86,88 and iAPX 186,188 User's Manual Programmer's
* Reference", p.3-38, apparently contains the same information, but I've not seen that document.
*
* Undefined Opcodes:
* Undefined [Invalid] Opcodes:
*
* When the opcodes 63H, 64H, 65H, 66H, 67H, F1H, FEH/xx111xxxB and FFH/xx111xxxB are executed,
* the 80186 will execute an illegal [invalid] instruction exception, interrupt 0x06.
@ -610,9 +610,9 @@ X86CPU.prototype.setAddressMask = function(addrMask)
*
* 6. Do Not Attempt Undefined 8086/8088 Operations
*
* Instructions like POP CS or MOV CS,op will either cause exception 6 (undefined opcode) or perform a protection
* setup operation like LIDT on the 80286. Undefined bit encodings for bits 5-3 of the second byte of POP MEM
* or PUSH MEM will cause exception 13 on the 80286.
* Instructions like POP CS or MOV CS,op will either cause exception 6 (undefined [invalid] opcode) or perform
* a protection setup operation like LIDT on the 80286. Undefined bit encodings for bits 5-3 of the second byte
* of POP MEM or PUSH MEM will cause exception 13 on the 80286.
*
* 7. Place a Far JMP Instruction at FFFF0H
*