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Added support for segment wrap-around in 8086/8088 real-mode (all stack operations, instruction fetches, and operand accesses should wrap now); real-mode wrap-around on newer processors should trigger a GP fault instead

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Jeff 2017-07-23 14:59:26 -07:00 • committed by Jeff Parsons
commit 6a3f7f4a5d
15 changed files with 3156 additions and 2906 deletions
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modules/pcx86/lib/x86.js
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@ -428,6 +428,7 @@ var X86 = {
NOREAD: 0x0001, // disable memory reads for the remainder of the current instruction
NOWRITE: 0x0002, // disable memory writes for the remainder of the current instruction
NOINTR: 0x0004, // a segreg has been set, or a prefix, or an STI (delay INTR acknowledgement)
WRAP: 0x0008, // a segment wrap-around has occurred (relevant to 8086/8088 only)
SEG: 0x0010, // segment override
LOCK: 0x0020, // lock prefix
REPZ: 0x0040, // repeat while Z (NOTE: this value MUST match PS.ZF; see opCMPSb/opCMPSw/opSCASb/opSCASw)