Retro/pcjs
Watch
1
0
Fork
You've already forked pcjs
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Force all segment register writes to be 16-bit, even when the operand size is 32-bit

Browse source
This commit is contained in:
Jeff Parsons 2016-01-27 10:58:01 -08:00
commit adb2b9aa90
9 changed files with 1265 additions and 1216 deletions
Download patch file Download diff file Expand all files Collapse all files

22
modules/pcjs/lib/x86seg.js
View file

@ -921,29 +921,29 @@ X86Seg.prototype.loadDesc8 = function(addrDesc, sel, fProbe)
* Frames coming from V86-mode ALWAYS contain 32-bit values, and look like this:
*
* low: EIP
* CS (padded to 32 bits)
* CS (upper 16 bits undefined)
* EFLAGS
* ESP
* SS (padded to 32 bits)
* ES (padded to 32 bits)
* DS (padded to 32 bits)
* FS (padded to 32 bits)
* high: GS (padded to 32 bits)
* SS (upper 16 bits undefined)
* ES (upper 16 bits undefined)
* DS (upper 16 bits undefined)
* FS (upper 16 bits undefined)
* high: GS (upper 16 bits undefined)
*
* Our caller (eg, fnINT()) will take care of pushing the final bits (EFLAGS, CS, and EIP).
*/
cpu.setDataSize(4);
cpu.assert(I386 && cpu.model >= X86.MODEL_80386);
cpu.pushWord(cpu.segGS.sel);
cpu.pushData(cpu.segGS.sel, 4, 2);
cpu.setGS(0);
cpu.pushWord(cpu.segFS.sel);
cpu.pushData(cpu.segFS.sel, 4, 2);
cpu.setFS(0);
cpu.pushWord(cpu.segDS.sel);
cpu.pushData(cpu.segDS.sel, 4, 2);
cpu.setDS(0);
cpu.pushWord(cpu.segES.sel);
cpu.pushData(cpu.segES.sel, 4, 2);
cpu.setES(0);
}
cpu.pushWord(regSSPrev);
cpu.pushData(regSSPrev, cpu.sizeData, 2);
cpu.pushWord(regSPPrev);
while (i) cpu.pushWord(this.awParms[--i]);
this.fStackSwitch = true;