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Fixed a double-trap MMU bug (both src and dst operands triggered a trap, but since the latter was an abort, the former needed to be ignored)

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This commit is contained in:
Jeff 2016-11-17 16:21:13 -08:00 • committed by Jeff Parsons
commit 05c2f0ebfe
4 changed files with 47 additions and 37 deletions
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61
modules/pdp11/lib/cpustate.js
View file

@ -169,9 +169,10 @@ CPUStatePDP11.prototype.initRegs = function()
/* /*
* TODO: Verify the initial state of all PDP-11 flags and registers (are they well-documented?) * TODO: Verify the initial state of all PDP-11 flags and registers (are they well-documented?)
*/ */
var f = 0xffff;
this.flagC = 0x10000; // PSW C bit this.flagC = 0x10000; // PSW C bit
this.flagV = 0x8000; // PSW V bit this.flagV = 0x8000; // PSW V bit
this.flagZ = 0xffff; // ~ PSW Z bit (TODO: Why do we clear instead of set Z, like other flags?) this.flagZ = f; // ~ PSW Z bit (TODO: Why do we clear instead of set Z, like other flags?)
this.flagN = 0x8000; // PSW N bit this.flagN = 0x8000; // PSW N bit
this.regPSW = 0x000f; // PSW other bits (TODO: What's the point of setting the flag bits here, too?) this.regPSW = 0x000f; // PSW other bits (TODO: What's the point of setting the flag bits here, too?)
this.regsGen = [ // General R0 - R7 this.regsGen = [ // General R0 - R7
@ -185,19 +186,18 @@ CPUStatePDP11.prototype.initRegs = function()
]; ];
this.mmuMode = 0; // current memory management mode (see PDP11.MODE.KERNEL | SUPER | UNUSED | USER) this.mmuMode = 0; // current memory management mode (see PDP11.MODE.KERNEL | SUPER | UNUSED | USER)
this.mmuLastPage = 0; this.mmuLastPage = 0;
// this.mmuLastVirtual = 0;
this.mapMMR3 = [4,2,0,1]; // map from mode to MMR3 I/D bit this.mapMMR3 = [4,2,0,1]; // map from mode to MMR3 I/D bit
this.mmuPDR = [ // memory management PDR registers by mode this.mmuPDR = [ // memory management PDR registers by mode
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], // kernel 0 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], // KERNEL (8 KIPDR regs followed by 8 KDPDR regs)
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], // super 1 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], // SUPER (8 SIPDR regs followed by 8 SDPDR regs)
[0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff], // mode 2 with illegal PDRs [f, f, f, f, f, f, f, f, f, f, f, f, f, f, f, f], // mode 2 (not used)
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0] // user 3 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0] // USER (8 UIPDR regs followed by 8 UDPDR regs)
]; ];
this.mmuPAR = [ // memory management PAR registers by mode this.mmuPAR = [ // memory management PAR registers by mode
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], // kernel 0 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], // KERNEL (8 KIPAR regs followed by 8 KDPAR regs)
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], // super 1 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], // SUPER (8 SIPDR regs followed by 8 SDPDR regs)
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], // mode 2 (not used) [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], // mode 2 (not used)
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0] // user 3 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0] // USER (8 UIPDR regs followed by 8 UDPDR regs)
]; ];
this.unibusMap = [ // 32 unibus map registers this.unibusMap = [ // 32 unibus map registers
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
@ -1541,7 +1541,6 @@ CPUStatePDP11.prototype.mapVirtualToPhysical = function(virtualAddress, accessFl
*/ */
if (!(accessFlags & this.mmuEnable)) { if (!(accessFlags & this.mmuEnable)) {
physicalAddress = virtualAddress & 0xffff; physicalAddress = virtualAddress & 0xffff;
// this.mmuLastVirtual = physicalAddress;
if (physicalAddress >= BusPDP11.IOPAGE_16BIT) { if (physicalAddress >= BusPDP11.IOPAGE_16BIT) {
physicalAddress |= this.addrIOPage; physicalAddress |= this.addrIOPage;
} }
@ -1552,44 +1551,54 @@ CPUStatePDP11.prototype.mapVirtualToPhysical = function(virtualAddress, accessFl
if (!(this.regMMR3 & this.mapMMR3[this.mmuMode])) page &= 7; if (!(this.regMMR3 & this.mapMMR3[this.mmuMode])) page &= 7;
pdr = this.mmuPDR[this.mmuMode][page]; pdr = this.mmuPDR[this.mmuMode][page];
physicalAddress = ((this.mmuPAR[this.mmuMode][page] << 6) + (virtualAddress & 0x1fff)) & this.mmuMask; physicalAddress = ((this.mmuPAR[this.mmuMode][page] << 6) + (virtualAddress & 0x1fff)) & this.mmuMask;
// this.mmuLastVirtual = virtualAddress;
var newMMR0 = 0; var newMMR0 = 0;
switch (pdr & 0x7) { switch (pdr & PDP11.PDR.ACF.MASK) {
case 1: // read-only with trap
case PDP11.PDR.ACF.RO1: // 0x1: read-only, abort on write attempt, memory management trap on read (11/70 only)
newMMR0 = PDP11.MMR0.TRAP_MMU; newMMR0 = PDP11.MMR0.TRAP_MMU;
/* falls through */ /* falls through */
case 2: // read-only
pdr |= 0x80; // Set A bit case PDP11.PDR.ACF.RO: // 0x2: read-only, abort on write attempt
pdr |= PDP11.PDR.ACCESSED;
if (accessFlags & PDP11.ACCESS.WRITE) { if (accessFlags & PDP11.ACCESS.WRITE) {
newMMR0 = PDP11.MMR0.ABORT_RO; newMMR0 = PDP11.MMR0.ABORT_RO;
} }
break; break;
case 4: // read-write with read-write trap
case PDP11.PDR.ACF.RW1: // 0x4: read/write, memory management trap upon completion of a read or write
newMMR0 = PDP11.MMR0.TRAP_MMU; newMMR0 = PDP11.MMR0.TRAP_MMU;
/* falls through */ /* falls through */
case 5: // read-write with write trap
case PDP11.PDR.ACF.RW2: // 0x5: read/write, memory management trap upon completion of a write (11/70 only)
if (accessFlags & PDP11.ACCESS.WRITE) { if (accessFlags & PDP11.ACCESS.WRITE) {
newMMR0 = PDP11.MMR0.TRAP_MMU; newMMR0 = PDP11.MMR0.TRAP_MMU;
} }
/* falls through */ /* falls through */
case 6: // read-write: set A & W bits
case PDP11.PDR.ACF.RW: // 0x6: read/write, no system trap/abort action
pdr |= ((accessFlags & PDP11.ACCESS.WRITE) ? 0xc0 : 0x80); pdr |= ((accessFlags & PDP11.ACCESS.WRITE) ? 0xc0 : 0x80);
break; break;
default:
default: // 0x0 (non-resident, abort all accesses) or 0x3 or 0x7 (unused, abort all accesses)
newMMR0 = PDP11.MMR0.ABORT_NR; newMMR0 = PDP11.MMR0.ABORT_NR;
break; break;
} }
if ((pdr & 0x7f08) != 0x7f00) { // skip checking most common case (hopefully) if ((pdr & (PDP11.PDR.PLF | PDP11.PDR.ED)) != PDP11.PDR.PLF) { // skip checking most common case (hopefully)
if (pdr & 0x8) { // expand downwards /*
if (pdr & 0x7f00) { * The Page Descriptor Register (PDR) Page Length Field (PLF) is a 7-bit block number, where a block
if ((virtualAddress & 0x1fc0) < ((pdr >> 2) & 0x1fc0)) { * is 64 bytes. Since the bit 0 of the block number is located at bit 8 of the PDR, we shift the PDR
* right 2 bits and then clear the bottom 6 bits by masking it with 0x1FC0.
*/
if (pdr & PDP11.PDR.ED) {
if (pdr & PDP11.PDR.PLF) {
if ((virtualAddress & 0x1FC0) < ((pdr >> 2) & 0x1FC0)) {
newMMR0 |= PDP11.MMR0.ABORT_PL; newMMR0 |= PDP11.MMR0.ABORT_PL;
} }
} }
} else { // expand upwards } else {
if ((virtualAddress & 0x1fc0) > ((pdr >> 2) & 0x1fc0)) { if ((virtualAddress & 0x1FC0) > ((pdr >> 2) & 0x1FC0)) {
newMMR0 |= PDP11.MMR0.ABORT_PL; newMMR0 |= PDP11.MMR0.ABORT_PL;
} }
} }
@ -1619,7 +1628,7 @@ CPUStatePDP11.prototype.mapVirtualToPhysical = function(virtualAddress, accessFl
* because otherwise we run the risk of infinitely looping; eg, we call trap(), which * because otherwise we run the risk of infinitely looping; eg, we call trap(), which
* calls mapVirtualToPhysical() on the trap vector, which faults again, etc. * calls mapVirtualToPhysical() on the trap vector, which faults again, etc.
*/ */
this.trap(PDP11.TRAP.MMU, 0, PDP11.REASON.ABORT); this.trap(PDP11.TRAP.MMU, PDP11.OPFLAG.TRAP_MMU, PDP11.REASON.ABORT);
} }
} }
if (!(this.regMMR0 & (PDP11.MMR0.ABORT | PDP11.MMR0.TRAP_MMU))) { if (!(this.regMMR0 & (PDP11.MMR0.ABORT | PDP11.MMR0.TRAP_MMU))) {

5
modules/pdp11/lib/defines.js
View file

@ -360,9 +360,10 @@ var PDP11 = {
RW1: 0x4, // read/write, memory management trap upon completion of a read or write RW1: 0x4, // read/write, memory management trap upon completion of a read or write
RW2: 0x5, // read/write, memory management trap upon completion of a write (11/70 only) RW2: 0x5, // read/write, memory management trap upon completion of a write (11/70 only)
RW: 0x6, // read/write, no system trap/abort action RW: 0x6, // read/write, no system trap/abort action
U2: 0x7 // unused, abort all accesses--reserved for future use U2: 0x7, // unused, abort all accesses--reserved for future use
MASK: 0x7
}, },
ED: 0x0080, // expansion direction (if set, the page expands downward from block number 127) ED: 0x0008, // expansion direction (if set, the page expands downward from block number 127)
UNUSED: 0x0030, UNUSED: 0x0030,
MODIFIED: 0x0040, // page has been written (bit cleared when either PDR or PAR is written) MODIFIED: 0x0040, // page has been written (bit cleared when either PDR or PAR is written)
ACCESSED: 0x0080, // page has been accessed (bit cleared when either PDR or PAR is written) (11/70 only) ACCESSED: 0x0080, // page has been accessed (bit cleared when either PDR or PAR is written) (11/70 only)

12
versions/pdpjs/1.30.3/pdp11-dbg.js
View file

@ -117,17 +117,17 @@ k.ee=function(){if(this.A.W){this.Jb>=this.nb&&Bd(this,!0);this.Ma=0;this.lb=Ba(
return}if(this.A.W){a=setTimeout;b=this.Fc;this.ba=Ba();var c=this.Cc;this.Ma&&(c=Math.round(c*this.Ma/this.pb));var c=c-(this.ba-this.lb),d=this.ba-this.T;d&&(this.na=Math.round(this.X/(10*d))/100,864E5<=d&&(this.ja=0,Ad(this)));if(0>c||this.na<this.qb)-1E3>c&&(this.T-=c),c=0;this.Jb+=this.Ma;this.ba+=c;a(b,c)}}}; return}if(this.A.W){a=setTimeout;b=this.Fc;this.ba=Ba();var c=this.Cc;this.Ma&&(c=Math.round(c*this.Ma/this.pb));var c=c-(this.ba-this.lb),d=this.ba-this.T;d&&(this.na=Math.round(this.X/(10*d))/100,864E5<=d&&(this.ja=0,Ad(this)));if(0>c||this.na<this.qb)-1E3>c&&(this.T-=c),c=0;this.Jb+=this.Ma;this.ba+=c;a(b,c)}}};
k.jb=function(a){if(yb(this))return!1;if(this.A.W)return this.j(this.toString()+" busy"),!1;Ad(this);this.A.W=!0;this.A.bc=!0;var b=this.G.run;b&&(b.textContent="Halt");this.C&&(a&&this.C.ub(!0),this.C.start(this.T,zd(this)));setTimeout(this.Fc,0);return!0};k.kb=function(){return 0};k.da=function(a){var b=!1;if(this.A.W){Cd(this);ec(this,this.X);this.X=0;this.A.W=!1;if(b=this.G.run)b.textContent="Run";this.C&&this.C.stop(Ba(),zd(this));b=!0}this.A.complete=a;return b}; k.jb=function(a){if(yb(this))return!1;if(this.A.W)return this.j(this.toString()+" busy"),!1;Ad(this);this.A.W=!0;this.A.bc=!0;var b=this.G.run;b&&(b.textContent="Halt");this.C&&(a&&this.C.ub(!0),this.C.start(this.T,zd(this)));setTimeout(this.Fc,0);return!0};k.kb=function(){return 0};k.da=function(a){var b=!1;if(this.A.W){Cd(this);ec(this,this.X);this.X=0;this.A.W=!1;if(b=this.G.run)b.textContent="Run";this.C&&this.C.stop(Ba(),zd(this));b=!0}this.A.complete=a;return b};
function Ed(a){this.Xa=+a.model||1170;this.Ac=a.addrReset||0;sd.call(this,a,6666667);this.decode=1120==this.Xa?Fd.bind(this):Gd.bind(this);Hd(this);this.M=0;this.P=null;this.A.complete=!1}z(Ed,sd);k=Ed.prototype;k.reset=function(){this.status("model "+this.Xa);this.A.W&&this.da();Hd(this);vd(this);this.A.error=!1;this.parent.reset.call(this)}; function Ed(a){this.Xa=+a.model||1170;this.Ac=a.addrReset||0;sd.call(this,a,6666667);this.decode=1120==this.Xa?Fd.bind(this):Gd.bind(this);Hd(this);this.M=0;this.P=null;this.A.complete=!1}z(Ed,sd);k=Ed.prototype;k.reset=function(){this.status("model "+this.Xa);this.A.W&&this.da();Hd(this);vd(this);this.A.error=!1;this.parent.reset.call(this)};
function Hd(a){a.U=65536;a.V=32768;a.$=65535;a.Z=32768;a.N=15;a.u=[0,0,0,0,0,0,0,a.Ac];a.Za=[0,0,0,0,0,0];a.La=[0,0,0,0];a.B=0;a.mb=0;a.$c=[4,2,0,1];a.O=[[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],[65535,65535,65535,65535,65535,65535,65535,65535],[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]];a.ha=[[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]];a.Tb=[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, function Hd(a){a.U=65536;a.V=32768;a.$=65535;a.Z=32768;a.N=15;a.u=[0,0,0,0,0,0,0,a.Ac];a.Za=[0,0,0,0,0,0];a.La=[0,0,0,0];a.B=0;a.mb=0;a.$c=[4,2,0,1];a.O=[[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],[65535,65535,65535,65535,65535,65535,65535,65535,65535,65535,65535,65535,65535,65535,65535,65535],[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]];a.ha=[[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]];a.Tb=
0,0,0,0,0,0,0,0,0];a.Jc=[0,0,0,0,0,0,0,0];a.Ic=0;a.J=0;a.D=a.H=0;a.g=a.f=a.yb=0;a.Aa=-1;Rb(a)}function Rb(a){a.Da=0;a.Kb=0;a.Mb=0;a.Ta=0;a.ua=0;a.Sb=0;a.sb=255;a.L=0;a.bb=0;a.Ea=262143;a.Nb=0;a.pa=0;a.P=null;a.v&&Id(a)}function Id(a){a.L?(a.S=65536,a.yc=a.Ta&16?4186112:253952,a.aa=a.Yc,a.sa=a.be,a.Vb=a.Ue,vc(a.v,a.Ta&16?22:18)):(a.S=0,a.yc=57344,a.aa=a.Xc,a.sa=a.Hc,a.Vb=a.Oc,vc(a.v,16))}function Uc(a){var b=a.Da;b&57344||(b=b&-3199|a.bb<<5|a.mb<<1);return b} [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0];a.Jc=[0,0,0,0,0,0,0,0];a.Ic=0;a.J=0;a.D=a.H=0;a.g=a.f=a.yb=0;a.Aa=-1;Rb(a)}function Rb(a){a.Da=0;a.Kb=0;a.Mb=0;a.Ta=0;a.ua=0;a.Sb=0;a.sb=255;a.L=0;a.bb=0;a.Ea=262143;a.Nb=0;a.pa=0;a.P=null;a.v&&Id(a)}function Id(a){a.L?(a.S=65536,a.yc=a.Ta&16?4186112:253952,a.aa=a.Yc,a.sa=a.be,a.Vb=a.Ue,vc(a.v,a.Ta&16?22:18)):(a.S=0,a.yc=57344,a.aa=a.Xc,a.sa=a.Hc,a.Vb=a.Oc,vc(a.v,16))}
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6
versions/pdpjs/1.30.3/pdp11.js
View file

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