Added some "special considerations" to PDP-10 byte pointer processing

This commit is contained in:
Jeff 2017-03-03 09:01:49 -08:00 committed by Jeff Parsons
commit 796a23ce6c
4 changed files with 196 additions and 143 deletions

View file

@ -168,19 +168,28 @@ PDP10.opFSC = function(op, acc)
*
* From the DEC PDP-10 System Reference Manual (May 1968), p. 2-16:
*
* Increment the byte pointer in location E as explained above.
* Increment the byte pointer in location E as explained [below].
*
* FROM ABOVE: To facilitate processing a series of bytes, several of the byte instructions increment the pointer,
* ie, modify it so that it points to the next byte position in a set of memory locations. Bytes are processed from
* left to right in a word, so incrementing merely replaces the current value of P by P - S, unless there is
* insufficient space in the present location for another byte of the specified size (P - S < 0). In this case Y is
* increased by one to point to the next consecutive location, and P is set to 36 - S to point to the first byte at
* the left in the new location.
* To facilitate processing a series of bytes, several of the byte instructions increment the
* pointer, ie, modify it so that it points to the next byte position in a set of memory locations.
* Bytes are processed from left to right in a word, so incrementing merely replaces the current value
* of P by P - S, unless there is insufficient space in the present location for another byte of the
* specified size (P - S < 0). In this case Y is increased by one to point to the next consecutive
* location, and P is set to 36 - S to point to the first byte at the left in the new location.
*
* CAUTION: Do not allow Y to reach maximum value. The whole pointer is incremented, so if Y is 2^18 - 1 it becomes
* zero and X is also incremented. The address calculation for the pointer uses the original X, but if a priority
* interrupt should occur before the calculation is complete, the incremented X is used when the instruction is
* repeated.
* CAUTION: Do not allow Y to reach maximum value. The whole pointer is incremented, so if Y is 2^18 - 1
* it becomes zero and X is also incremented. The address calculation for the pointer uses the original X,
* but if a priority interrupt should occur before the calculation is complete, the incremented X is used
* when the instruction is repeated.
*
* SPECIAL CONSIDERATIONS: If S is greater than P and also greater than 36, incrementing produces a new
* P equal to 100 - S rather than 36 - S. For S > 36 the byte is at most the entire word; for P >= 36 no
* byte is processed (loading merely clears AC). If both P and S are less than 36 but P + S > 36,
* a byte of size 36 - P is loaded from position P, or the right 36 - P bits of the byte are deposited
* in position P.
*
* NOTE: Until I can conduct real-world testing, I'm assuming when they say "100 - S", DEC really meant "64 - S",
* which is 100 (base 8), which makes much more sense, since P is limited to a range of 00-77 (base 8).
*
* @this {CPUStatePDP10}
* @param {number} op
@ -188,15 +197,26 @@ PDP10.opFSC = function(op, acc)
*/
PDP10.opIBP = function(op, acc)
{
var inc = 0;
var w = this.readWord(this.regEA);
var p = (w / PDP10.OPCODE.P_SCALE) & PDP10.OPCODE.P_MASK;
var s = (w >> PDP10.OPCODE.S_SHIFT) & PDP10.OPCODE.S_MASK;
p -= s;
if (p < 0) {
inc++;
p = 36 - s;
w++;
if (p < 0) p = 64 - s; // see SPECIAL CONSIDERATIONS and NOTE above
}
/*
* Since the documentation above makes clear that the effect of the increment (of w) extends past the Y
* bits and into (at least) the X bits, we first re-assemble a new pointer with updated P bits (along with
* the original S bits and the remaining bits covered by PTR_MASK) and then increment as needed.
*
* Yes, PTR_MASK could have included the S bits as well and made the following expression a TINY bit simpler,
* but I would like to keep PTR_MASK distinct from both the P and S fields.
*/
w = (p * PDP10.OPCODE.P_SCALE) + (s << PDP10.OPCODE.S_SHIFT) + (w & PDP10.OPCODE.PTR_MASK);
if (inc) w = (w + inc) % PDP10.DATA_LIMIT;
this.writeWord(this.regEA, w);
};
@ -210,6 +230,12 @@ PDP10.opIBP = function(op, acc)
* and clear the remaining AC bits. The location containing the byte is unaffected, the original contents
* of AC are lost.
*
* SPECIAL CONSIDERATIONS: If S is greater than P and also greater than 36, incrementing produces a new
* P equal to 100 - S rather than 36 - S. For S > 36 the byte is at most the entire word; for P >= 36 no
* byte is processed (loading merely clears AC). If both P and S are less than 36 but P + S > 36,
* a byte of size 36 - P is loaded from position P, or the right 36 - P bits of the byte are deposited
* in position P.
*
* @this {CPUStatePDP10}
* @param {number} op
* @param {number} acc
@ -238,8 +264,14 @@ PDP10.opILDB = function(op, acc)
* From the DEC PDP-10 System Reference Manual (May 1968), p. 2-16:
*
* Retrieve a byte of S bits from the location and position specified by the pointer contained in location E,
* load it into the right end of AC, and clear the remaining AC bits. The location containing the byte is unaffected,
* the original contents of AC are lost.
* load it into the right end of AC, and clear the remaining AC bits. The location containing the byte is
* unaffected, the original contents of AC are lost.
*
* SPECIAL CONSIDERATIONS: If S is greater than P and also greater than 36, incrementing produces a new
* P equal to 100 - S rather than 36 - S. For S > 36 the byte is at most the entire word; for P >= 36 no
* byte is processed (loading merely clears AC). If both P and S are less than 36 but P + S > 36,
* a byte of size 36 - P is loaded from position P, or the right 36 - P bits of the byte are deposited
* in position P.
*
* @this {CPUStatePDP10}
* @param {number} op
@ -263,6 +295,11 @@ PDP10.opLDB = function(op, acc)
if (p + s <= 32) {
w = (w >> p) & ((1 << s) - 1);
} else {
/*
* Regarding the SPECIAL CONSIDERATIONS above, even if the P ("shift") and/or S ("mask") values are
* over-large, that should be fine, because nothing but additional zero bits will be included (provided
* our memory is working properly and didn't give us more than 36 bits).
*/
w = Math.trunc(w / Math.pow(2, p)) % Math.pow(2, s);
}
this.writeWord(acc, w);
@ -278,6 +315,12 @@ PDP10.opLDB = function(op, acc)
* the location and position specified by the newly incremented pointer. The original contents of the bits
* that receive the byte are lost, AC and the remaining bits of the deposit location are unaffected.
*
* SPECIAL CONSIDERATIONS: If S is greater than P and also greater than 36, incrementing produces a new
* P equal to 100 - S rather than 36 - S. For S > 36 the byte is at most the entire word; for P >= 36 no
* byte is processed (loading merely clears AC). If both P and S are less than 36 but P + S > 36,
* a byte of size 36 - P is loaded from position P, or the right 36 - P bits of the byte are deposited
* in position P.
*
* @this {CPUStatePDP10}
* @param {number} op
* @param {number} acc
@ -309,6 +352,12 @@ PDP10.opIDPB = function(op, acc)
* in location E. The original contents of the bits that receive the byte are lost, AC and the remaining
* bits of the deposit location are unaffected.
*
* SPECIAL CONSIDERATIONS: If S is greater than P and also greater than 36, incrementing produces a new
* P equal to 100 - S rather than 36 - S. For S > 36 the byte is at most the entire word; for P >= 36 no
* byte is processed (loading merely clears AC). If both P and S are less than 36 but P + S > 36,
* a byte of size 36 - P is loaded from position P, or the right 36 - P bits of the byte are deposited
* in position P.
*
* @this {CPUStatePDP10}
* @param {number} op
* @param {number} acc
@ -328,7 +377,12 @@ PDP10.opDPB = function(op, acc)
}
var p = (this.regPS / PDP10.OPCODE.P_SCALE) & PDP10.OPCODE.P_MASK;
var s = (this.regPS >> PDP10.OPCODE.S_SHIFT) & PDP10.OPCODE.S_MASK;
var b = (this.readWord(acc) % Math.pow(2, s)) * Math.pow(2, p);
/*
* Regarding the SPECIAL CONSIDERATIONS above, even if the P ("shift") and/or S ("mask") values are
* over-large, we "mask" the resulting byte value (b) to 36 bits, so that when we re-assemble the final
* result (w), there shouldn't be any overlap or overflow.
*/
var b = ((this.readWord(acc) % Math.pow(2, s)) * Math.pow(2, p)) % PDP10.DATA_LIMIT;
w = (w - (w % Math.pow(2, p + s))) + b + (w % Math.pow(2, p));
this.writeWord(this.regEA, w);
this.regPS = -1;

View file

@ -179,10 +179,10 @@ class CPUStatePDP10 extends CPUPDP10 {
this.fOverflow = this.fCarry0 = this.fCarry1 = this.fNoDivide = this.fPDOverflow = false;
/*
* This next two internal regs are used only with byte instructions, to record an active byte
* pointer state (regPS) and pointer address (regPA).
* This next internal reg is used only with byte instructions, to record an active byte
* pointer state (regPS).
*/
this.regPS = this.regPA = -1;
this.regPS = -1;
/*
* This is queried and displayed by the Panel when it's not displaying its own ADDRESS register
@ -286,7 +286,6 @@ class CPUStatePDP10 extends CPUPDP10 {
this.regEA,
this.regRA,
this.regPS,
this.regPA,
this.regOP,
this.regPC,
this.lastPC,
@ -317,7 +316,6 @@ class CPUStatePDP10 extends CPUPDP10 {
this.regEA,
this.regRA,
this.regPS,
this.regPA,
this.regOP,
this.regPC,
this.lastPC,

View file

@ -31,8 +31,8 @@ var l,aa="function"==typeof Object.defineProperties?Object.defineProperty:functi
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function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},
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function je(a){v.call(this,"RAM",a);this.T=this.Ca=null;this.f=+a.addr;this.u=+a.size;this.na=a.load;this.ma=a.exec;null!=this.na&&(this.na=+this.na);null!=this.ma&&(this.ma=+this.ma);this.v=this.H=!1;this.b=a.file;this.B=qa(this.b);if(this.b){a=this.b;var b=ra(this.B);"json"!=b&&"hex"!=b&&(a=ya()+"/api/v1/dump?file="+this.b+"&format=bytes&decimal=true");var c=this;Fa(a,null,!0,function(a,b,g){g?(c.da("Unable to load RAM resource (error "+g+": "+a+")"),c.b=null):(hb(c.La,a,b),(a=Ga(a,b))?(c.Ca=a.Ca,
function je(a){v.call(this,"RAM",a);this.T=this.Ca=null;this.f=+a.addr;this.u=+a.size;this.na=a.load;this.ma=a.exec;null!=this.na&&(this.na=+this.na);null!=this.ma&&(this.ma=+this.ma);this.v=this.H=!1;this.b=a.file;this.B=qa(this.b);if(this.b){a=this.b;var b=ra(this.B);"json"!=b&&"hex"!=b&&(a=ya()+"/api/v1/dump?file="+this.b+"&format=bytes&decimal=true");var c=this;Fa(a,null,!0,function(a,b,g){g?(c.da("Unable to load RAM resource (error "+g+": "+a+")"),c.b=null):(gb(c.La,a,b),(a=Ga(a,b))?(c.Ca=a.Ca,
c.T=a.T,null==c.na&&(c.na=a.na),null==c.ma&&(c.ma=a.ma)):c.b=null);ke(c)})}}p(je,v);je.prototype.wa=function(a,b,c,d){this.G=b;this.i=c;this.A=d;ke(this)};je.prototype.pa=function(a,b){this.T&&(this.A&&ie(this.A,this.id,this.f,this.u,this.T),delete this.T);b||this.reset();return!0};je.prototype.fa=function(){return!0};
function ke(a){if(a.G&&(!a.v&&a.u&&(Dc(a.G,a.f,a.u,1)?a.v=!0:a.u=0),!Eb(a))){if(!a.v)u("No RAM allocated");else if(a.b){if(!a.Ca)return;le(a,a.Ca,a.na,a.ma,a.f)?a.status('Loaded image "'+a.B+'"'):a.da('Error loading image "'+a.B+'"')}a.H=!0;D(a)}}
je.prototype.reset=function(){if(this.v&&!this.H){for(var a=this.G,b=this.f,c=this.u,d=b&16383,b=b>>>a.f;0<c&&b<a.b.length;){var e=a.b[b],g=c,f=0,h,d=d||0,f=f||0;0>f&&f>=ma&&(f+=la);f=Math.trunc(Math.abs(f))%la;void 0===g&&(g=e.size);for(h=d;g--&&h<e.size;h++)e.F(f,d,e.w+d);c-=16384;b++;d=0}this.Ca&&le(this,this.Ca,this.na,this.ma,this.f,!this.A)}this.H=!1};
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function Rf(a,b,c,d){var e={},g=a.H[b].mb,f=0,h=null;0<=c&&c<g.length&&(f=g[c][0],h=g[c][1]);h&&(e=a.H[b].T[h],h="."==h.charAt(0)?null:e.l||h);d.push(h);d.push(f);d.push(e.a);d.push(e.c)}function Sf(a,b){var c=b.match(/^\s*([A-Z_]?[A-Z0-9_]*)\s*(=?)\s*(.*)$/i);if(c){if(!c[1])return ve(a)||a.g("no variables"),!0;if(!c[2])return ve(a,c[1]);if(!c[3])return delete a.W[c[1]],!0;b=P(a,c[3]);return void 0!==b?(a.W[c[1]]=b,!0):!1}a.g("invalid assignment:"+b);return!1}
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(va+=Fe(hc),va+=" ");for(var lf=0;1==hf&&6>lf;lf++)jf+=String.fromCharCode((hc%64|0)+32),hc/=64}ua&&(ua+="\n");ua=ff?ua+(va+","):ua+(W+": "+va+(0>kf?" "+jf:""))}ua&&a.g(ua);a.ca=Bg}}}}break;case "e":if("else"==f[0])break;var mf,nf,of=f[0],pd=f[1];"e"==of||"ew"==of?(mf=a.xa,nf=a.fb):pd=null;if(null==pd)a.g("edit memory commands:"),a.g("\tew [a] [...] edit words at address a");else{var ic=T(a,pd,a.ja);if(ic)for(var jc=2;jc<f.length;jc++){var qd=P(a,f[jc]);if(void 0===qd){a.g("unknown value: "+f[jc]);
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case "p":if("print"==f[0]){Uf(a,b.substr(5));break}var wf=f[0],xf="p"==wf?0:"pr"==wf?1:-1;if("?"==f[1]||0>xf)a.g("step commands:"),a.g("\tp\tstep over instruction"),a.g("\tpr\tstep over instruction with register update");else if(a.N)a.g("step in progress");else{var yf=Q(a.i.u);a.xa(yf);a.N?(a.Da(a.b,yf,!0),Qe(a)||(a.F&&zd(a.F),a.N=0)):Vf(a,xf?"tr":"t")}break;case "r":if("reset"==b){a.F&&a.F.reset();break}Bf(a,f);break;case "s":a:switch(f[1]){case "base":if(f[2]){var pb=+f[2];if(8==pb||10==pb||16==
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" version 1.34.2 ("+a.i.kb+",RELEASE)");a.g(window?window.navigator.userAgent:"");break}g=!0;break;case "?":if(f[1]){Uf(a,b.substr(1));break}var wd="commands:",xd;for(xd in Xf)wd+="\n"+Ba(xd,9)+Xf[xd];Jd(a)||(wd+="\nnote: history disabled if no exec breakpoints");a.g(wd);break;default:g=!0}g&&(a.g("unknown command: "+b),d=!1)}}catch(Af){a.g("debugger error: "+(Af.stack||Af.message)),d=!1}return d}function ad(a,b,c){b=pe(a,b,c);for(var d in b)if(!Of(a,b[+d]))return!1;return!0}
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