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Working prefetch support (speeds up 80386 operation when paging)

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This commit is contained in:
Jeff Parsons 2015-10-27 11:25:02 -07:00
commit 526da018d0
5 changed files with 256 additions and 458 deletions
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102
modules/pcjs/lib/x86ops.js
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@ -1598,12 +1598,7 @@ X86.opINSb = function INSb()
this.regECX = (this.regECX & ~maskAddr) | ((this.regECX - nDelta) & maskAddr);
this.nStepCycles -= nCycles;
if (nReps) {
if (BUGS_8086) {
this.rewindIP(-2); // this instruction does not support multiple overrides
this.assert(this.regLIP == this.opLIP);
} else {
this.regLIP = this.opLIP;
}
this.resetIP(-2);
this.opFlags |= X86.OPFLAG.REPEAT;
}
}
@ -1656,12 +1651,7 @@ X86.opINSw = function INSw()
this.regECX = (this.regECX & ~maskAddr) | ((this.regECX - nDelta) & maskAddr);
this.nStepCycles -= nCycles;
if (nReps) {
if (BUGS_8086) {
this.rewindIP(-2); // this instruction does not support multiple overrides
this.assert(this.regLIP == this.opLIP);
} else {
this.regLIP = this.opLIP;
}
this.resetIP(-2);
this.opFlags |= X86.OPFLAG.REPEAT;
}
}
@ -1710,12 +1700,7 @@ X86.opOUTSb = function OUTSb()
this.regECX = (this.regECX & ~maskAddr) | ((this.regECX - nDelta) & maskAddr);
this.nStepCycles -= nCycles;
if (nReps) {
if (BUGS_8086) {
this.rewindIP(-2); // this instruction does not support multiple overrides
this.assert(this.regLIP == this.opLIP);
} else {
this.regLIP = this.opLIP;
}
this.resetIP(-2);
this.opFlags |= X86.OPFLAG.REPEAT;
}
}
@ -1767,12 +1752,7 @@ X86.opOUTSw = function OUTSw()
this.regECX = (this.regECX & ~maskAddr) | ((this.regECX - nDelta) & maskAddr);
this.nStepCycles -= nCycles;
if (nReps) {
if (BUGS_8086) {
this.rewindIP(-2); // this instruction does not support multiple overrides
this.assert(this.regLIP == this.opLIP);
} else {
this.regLIP = this.opLIP;
}
this.resetIP(-2);
this.opFlags |= X86.OPFLAG.REPEAT;
}
}
@ -2769,12 +2749,7 @@ X86.opMOVSb = function MOVSb()
this.nStepCycles -= nCycles;
this.regECX = (this.regECX & ~maskAddr) | ((this.regECX - nDelta) & maskAddr);
if (nReps) {
if (BUGS_8086) {
this.rewindIP(((this.opPrefixes & X86.OPFLAG.SEG)? -3 : -2));
this.assert(this.regLIP == this.opLIP);
} else {
this.regLIP = this.opLIP;
}
this.resetIP(((this.opPrefixes & X86.OPFLAG.SEG)? -3 : -2));
this.opFlags |= X86.OPFLAG.REPEAT;
}
}
@ -2812,12 +2787,7 @@ X86.opMOVSw = function MOVSw()
this.nStepCycles -= nCycles;
this.regECX = (this.regECX & ~maskAddr) | ((this.regECX - nDelta) & maskAddr);
if (nReps) {
if (BUGS_8086) {
this.rewindIP(((this.opPrefixes & X86.OPFLAG.SEG)? -3 : -2));
this.assert(this.regLIP == this.opLIP);
} else {
this.regLIP = this.opLIP;
}
this.resetIP(((this.opPrefixes & X86.OPFLAG.SEG)? -3 : -2));
this.opFlags |= X86.OPFLAG.REPEAT;
}
}
@ -2865,12 +2835,7 @@ X86.opCMPSb = function CMPSb()
* two values are equal, we must continue.
*/
if (nReps && this.getZF() == (this.opPrefixes & X86.OPFLAG.REPZ)) {
if (BUGS_8086) {
this.rewindIP(((this.opPrefixes & X86.OPFLAG.SEG)? -3 : -2));
this.assert(this.regLIP == this.opLIP);
} else {
this.regLIP = this.opLIP;
}
this.resetIP(((this.opPrefixes & X86.OPFLAG.SEG)? -3 : -2));
this.opFlags |= X86.OPFLAG.REPEAT;
}
}
@ -2918,12 +2883,7 @@ X86.opCMPSw = function CMPSw()
* two values are equal, we must continue.
*/
if (nReps && this.getZF() == (this.opPrefixes & X86.OPFLAG.REPZ)) {
if (BUGS_8086) {
this.rewindIP(((this.opPrefixes & X86.OPFLAG.SEG)? -3 : -2));
this.assert(this.regLIP == this.opLIP);
} else {
this.regLIP = this.opLIP;
}
this.resetIP(((this.opPrefixes & X86.OPFLAG.SEG)? -3 : -2));
this.opFlags |= X86.OPFLAG.REPEAT;
}
}
@ -2984,12 +2944,7 @@ X86.opSTOSb = function STOSb()
this.regECX = (this.regECX & ~maskAddr) | ((this.regECX - nDelta) & maskAddr);
this.nStepCycles -= nCycles;
if (nReps) {
if (BUGS_8086) {
this.rewindIP(-2); // this instruction does not support multiple overrides
this.assert(this.regLIP == this.opLIP);
} else {
this.regLIP = this.opLIP;
}
this.resetIP(-2);
this.opFlags |= X86.OPFLAG.REPEAT;
}
}
@ -3030,12 +2985,7 @@ X86.opSTOSw = function STOSw()
this.regECX = (this.regECX & ~maskAddr) | ((this.regECX - nDelta) & maskAddr);
this.nStepCycles -= nCycles;
if (nReps) {
if (BUGS_8086) {
this.rewindIP(-2); // this instruction does not support multiple overrides
this.assert(this.regLIP == this.opLIP);
} else {
this.regLIP = this.opLIP;
}
this.resetIP(-2);
this.opFlags |= X86.OPFLAG.REPEAT;
}
}
@ -3073,12 +3023,7 @@ X86.opLODSb = function LODSb()
this.regECX = (this.regECX & ~maskAddr) | ((this.regECX - nDelta) & maskAddr);
this.nStepCycles -= nCycles;
if (nReps) {
if (BUGS_8086) {
this.rewindIP(((this.opPrefixes & X86.OPFLAG.SEG)? -3 : -2));
this.assert(this.regLIP == this.opLIP);
} else {
this.regLIP = this.opLIP;
}
this.resetIP(((this.opPrefixes & X86.OPFLAG.SEG)? -3 : -2));
this.opFlags |= X86.OPFLAG.REPEAT;
}
}
@ -3118,12 +3063,7 @@ X86.opLODSw = function LODSw()
this.regECX = (this.regECX & ~maskAddr) | ((this.regECX - nDelta) & maskAddr);
this.nStepCycles -= nCycles;
if (nReps) {
if (BUGS_8086) {
this.rewindIP(((this.opPrefixes & X86.OPFLAG.SEG)? -3 : -2));
this.assert(this.regLIP == this.opLIP);
} else {
this.regLIP = this.opLIP;
}
this.resetIP(((this.opPrefixes & X86.OPFLAG.SEG)? -3 : -2));
this.opFlags |= X86.OPFLAG.REPEAT;
}
}
@ -3167,12 +3107,7 @@ X86.opSCASb = function SCASb()
* two values are equal, we must continue.
*/
if (nReps && this.getZF() == (this.opPrefixes & X86.OPFLAG.REPZ)) {
if (BUGS_8086) {
this.rewindIP(-2); // this instruction does not support multiple overrides
this.assert(this.regLIP == this.opLIP);
} else {
this.regLIP = this.opLIP;
}
this.resetIP(-2);
this.opFlags |= X86.OPFLAG.REPEAT;
}
}
@ -3216,12 +3151,7 @@ X86.opSCASw = function SCASw()
* two values are equal, we must continue.
*/
if (nReps && this.getZF() == (this.opPrefixes & X86.OPFLAG.REPZ)) {
if (BUGS_8086) {
this.rewindIP(-2); // this instruction does not support multiple overrides
this.assert(this.regLIP == this.opLIP);
} else {
this.regLIP = this.opLIP;
}
this.resetIP(-2);
this.opFlags |= X86.OPFLAG.REPEAT;
}
}
@ -4169,7 +4099,7 @@ X86.opHLT = function HLT()
* on the theory that whoever's using the Debugger would like to see HLTs.
*/
if (DEBUGGER && this.dbg && this.messageEnabled(Messages.HALT)) {
this.rewindIP(-1); // this is purely for the Debugger's benefit, to show the HLT
this.resetIP(-1); // this is purely for the Debugger's benefit, to show the HLT
this.dbg.stopCPU();
return;
}
@ -4178,7 +4108,7 @@ X86.opHLT = function HLT()
* in the water (we have no NMI generation mechanism at the moment).
*/
if (!this.getIF()) {
if (DEBUGGER && this.dbg) this.rewindIP(-1);
if (DEBUGGER && this.dbg) this.resetIP(-1);
this.stopCPU();
}
};