From 796a23ce6c719c312cba8d4e0f28c9ad271e8e85 Mon Sep 17 00:00:00 2001 From: Jeff Date: Fri, 3 Mar 2017 09:01:49 -0800 Subject: [PATCH] Added some "special considerations" to PDP-10 byte pointer processing --- modules/pdp10/lib/cpuops.js | 84 +++++++++++++--- modules/pdp10/lib/cpustate.js | 8 +- versions/pdpjs/1.34.2/pdp10-dbg.js | 153 +++++++++++++++-------------- versions/pdpjs/1.34.2/pdp10.js | 94 +++++++++--------- 4 files changed, 196 insertions(+), 143 deletions(-) diff --git a/modules/pdp10/lib/cpuops.js b/modules/pdp10/lib/cpuops.js index 75a7fda9c..eed4d7ca3 100644 --- a/modules/pdp10/lib/cpuops.js +++ b/modules/pdp10/lib/cpuops.js @@ -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; diff --git a/modules/pdp10/lib/cpustate.js b/modules/pdp10/lib/cpustate.js index c9270a644..736532cc2 100644 --- a/modules/pdp10/lib/cpustate.js +++ b/modules/pdp10/lib/cpustate.js @@ -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, 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