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This commit is contained in:
Jeff Parsons 2015-11-26 11:34:14 -08:00
commit b1bea17aef
35 changed files with 120 additions and 54 deletions
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8
modules/pcjs/lib/x86func.js
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@ -2936,13 +2936,13 @@ X86.fnSGDT = function(dst, src)
*
* However, Intel obviously meant the reverse (ie, that the BASE field is truncated when using a 16-bit
* OPERAND size, not when using a 32-bit OPERAND size).
*
* UPDATE: Thanks to Michal Necasek, we now know that the: "386 in reality does not pay attention to the
* operand size (despite Intel's claims to the contrary). In fact Windows 3.11/Win32s relies on it -- at least
* in some configurations, it will execute SGDT in 16-bit code and will crash if all 6 bytes aren't stored."
*/
if (this.sizeData == 2) {
/*
* Thanks to Michal Necasek, we now know that the: "386 in reality does not pay attention to the operand
* size (despite Intel's claims to the contrary). In fact Windows 3.11/Win32s relies on it -- at least in
* some configurations, it will execute SGDT in 16-bit code and will crash if all 6 bytes aren't stored."
*
* Based on the above information, we no longer mask the 6th byte on the 80386 when the OPERAND size is 2.
*
* addr &= 0x00ffffff;