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Added support for machine configs with a specific CPU stepping (also, fixed IMUL reg,r/m,imm disassembly)

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This commit is contained in:
Jeff Parsons 2015-10-28 16:57:55 -07:00
commit 6dcb644a05
14 changed files with 1169 additions and 1096 deletions
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12
modules/pcjs/lib/x86func.js
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@ -2033,6 +2033,18 @@ X86.fnMULw = function(dst, src)
this.regMDHi = (result >> 16) & 0xffff;
} else {
X86.fnMUL32.call(this, dst, this.regEAX);
if (this.model == X86.MODEL_80386 && this.stepping == X86.STEPPING_B1) {
if (this.regEAX == 0x0417A000 && dst == 0x00000081) {
/*
* In this case, the result should be 0x20FE7A000 (ie, regMDHi should be 0x2), and I'm not
* sure what the typical failure would look like, so I'll just set regMDHi to 0.
*
* If you want a B1 stepping without this 32-bit multiplication flaw, select the B2 stepping.
*/
this.assert(this.regMDLo == 0x0FE7A000 && this.regMDHi == 0x00000002);
this.regMDHi = 0;
}
}
}
if (this.regMDHi) {