Fixed TEST 40 in diagnostic EKBBF0 by including address 177776 in the RED stack overflow range

disks/dec/rl02k/xxdp/ekbad0/README.md

@@ -42,3 +42,13 @@ p. 1-6:
 	    SW05 = 1 skip bus request 5 test
 	    SW04 = 1 skip bus request 4 test
 	    SW00 = 1 skip operator intervention testing
+
+The closest we have to a source code listing of the EKBAD0 diagnostic comes from some
+[scanned microfiche](http://archive.pcjs.org/pubs/dec/pdp11/diags/AH-7963D-MC_CEKBAD0_1170_CPU_1_May80.pdf)
+on [bitsavers.org](http://bitsavers.trailing-edge.com/pdf/dec/pdp11/microfiche/ftp.j-hoppe.de/bw/gh/) for:
+
+	PRODUCT CODE: AC-7962D-MC
+	PRODUCT NAME: CEKBAD0 11/70 CPU #1
+	DATE CREATED: MAY, 1980
+	MAINTAINER:   DIAGNOSTIC ENGINEERING
+

disks/dec/rl02k/xxdp/ekbbf0/README.md

@@ -11,7 +11,7 @@ From the
 [PDP-11 Diagnostic Handbook (1988)](http://archive.pcjs.org/pubs/dec/pdp11/diags/PDP11_DiagnosticHandbook_1988.pdf),
 p. 1-7:
 
-	11/70 CPU DIAGNOSTIC PART 1
+	11/70 CPU DIAGNOSTIC PART 2
 
 	ABSTRACT:
 
@@ -44,10 +44,7 @@ p. 1-7:
 	    SW01 = 1 test selector (with switch 8)
 	    SW00 = 1 skip operator intervention testing
 
-At the moment, PDPjs is failing a couple of tests within this diagnostic:
+When I first ran this diagnostic in PDPjs, it failed a few tests:
-
-	.R EKBBF0
-	EKBBF0.BIC
 
 	CEKBBF0 11/70 CPU #2
 	A
@@ -55,11 +52,127 @@ At the moment, PDPjs is failing a couple of tests within this diagnostic:
 	NOT GETTING TO TMCD E31 OR E31 BAD
 	ERRORPC TEST NUMBER
 	020646  000040
-
+	
-
+	
-	CPU UNDER TEST FOUND TO BE A KB11-B/C OR KB11-CM
+	CPU UNDER TEST FOUND TO BE A KB11-B/C OR KB11-CM                
-
+	
 	TMCA E67(8) NOT GETTING TO E76(13) OR E76 IS BAD
 	ERRORPC TEST NUMBER
 	026030  000063
+	
+After setting a breakpoint at 020646 and then dumping the instruction history buffer when it was hit:
 
+	>> bp 020646
+	bp 020646 set
+	>> g
+	bp 020646 hit
+	stopped (18110643 instructions, 86218232 cycles, 12936 ms, 6664984 hz)
+	R0=177777 R1=032435 R2=152110 R3=000024 R4=153352 R5=001164
+	SP=001076 PC=020646 PS=000000 IR=000000 SL=000377 T0 N0 Z0 V0 C0
+	020646: 104241                 EMT   241
+	>> dh 22 22
+	020404: 012767 021136 160656   MOV   #21136,001270          ;history=22
+	020412: 012767 020450 160466   MOV   #20450,001106          ;history=21
+	020420: 013767 177776 160542   MOV   @#177776,001170        ;history=20
+	020426: 032737 000020 177776   BIT   #20,@#177776           ;history=19
+	020434: 001405                 BEQ   020450                 ;history=18
+	020450: 012737 000340 000006   MOV   #340,@#6               ;history=17
+	020456: 012767 020472 160424   MOV   #20472,001110          ;history=16
+	020464: 012737 020530 000024   MOV   #20530,@#24            ;history=15
+	020472: 012737 020546 000004   MOV   #20546,@#4             ;history=14
+	020500: 012706 000336          MOV   #336,SP                ;history=13
+	020504: 012700 177777          MOV   #177777,R0             ;history=12
+	020510: 010016                 MOV   R0,@SP                 ;history=11
+	020546: 023727 000000 020512   CMP   @#0,#20512             ;history=10
+	020554: 001407                 BEQ   020574                 ;history=9
+	020574: 022737 177777 000336   CMP   #177777,@#336          ;history=8
+	020602: 001003                 BNE   020612                 ;history=7
+	020612: 012767 020620 160270   MOV   #20620,001110          ;history=6
+	020620: 012737 020650 000004   MOV   #20650,@#4             ;history=5
+	020626: 012706 177776          MOV   #177776,SP             ;history=4
+	020632: 005016                 CLR   @SP                    ;history=3
+	020634: 012706 001076          MOV   #1076,SP               ;history=2
+	020640: 012737 032636 000004   MOV   #32636,@#4             ;history=1
+	020646: 104241                 EMT   241
+
+The closest we have to a source code listing of the EKBBF0 diagnostic comes from some
+[scanned microfiche](http://archive.pcjs.org/pubs/dec/pdp11/diags/AH-7968F-MC_CEKBBF0_1170_CPU_2_May80.pdf)
+on [bitsavers.org](http://bitsavers.trailing-edge.com/pdf/dec/pdp11/microfiche/ftp.j-hoppe.de/bw/gh/) for:
+
+	PRODUCT CODE: AC-7966F-MC
+	PRODUCT NAME: CEKBBF0 11/70 CPU #2
+	DATE CREATED: MAY, 1980
+	MAINTAINER:   DIAGNOSTIC ENGINEERING
+
+The source code listing for TEST 40 appears to match the code above:
+
+	;;***************************************************************
+	;*TEST 40       RED ZONE TRAP
+	;*
+	;*      A RED ZONE TRAP IS FIRST ATTEMPTED WITH THE SP AT 336.
+	;*      IF BEN13 FAILS EXECUTION WILL GO TO EITHER BRK.80 OR BRK.20
+	;*      OR PUP.00.
+	;*      BRK.80 WILL CAUSE THE OLD PSW AND PC TO BE STACKED ON THE
+	;*      OLD STACK INSTEAD OF LOCATIONS 2 AND 0.
+	;*      BRK.20 WILL MAKE IT LOOK LIKE THE RED ZONE FAILED.
+	;*      PUP.00 WILL CAUSE A TRAP TO LOCATION 24.
+	;*
+	;*      IF THE PROCESSOR FAILS TO TRAP EITHER TMCD SL RED IS
+	;*      NOT GOING LOW OR TMCC ABORT IS NOT GOING LOW.
+	;*
+	;*      IF UBCB ABOTR RESTART FAILS TO GO LOW OR E10(13)
+	;*      IS BAD THE PROCESSOR WILL HANG IN THE PAUSE STATE.
+	;;***************************************************************
+	TST40:  SCOPE
+	        MOV     #TST41,NEXTTST  ;SAVE ADDRESS OF NEXT TEST
+	        MOV     #14$,$LPADR     ;SETUP LOOP ADR
+	        MOV     @#PSW,$TMP3     ;SAVE PSW
+	        BIT     #BIT4,@#PSW     ;IS T BIT ON?
+	        BEQ     14$             ;BRANCH IF NO
+	        MOV     #PR7,-(SP)      ;PUT NEW PSW ON STACK
+	        MOV     #14$,-(SP)      ;PUT RETURN ADR ON STACK
+	        RTT                     ;TURN T BIT OFF
+	14$:    MOV     #PR7,@#ERRVEC+2 ;RESTORE ERRVEC PSW
+	        MOV     #64$,$LPERR     ;SETUP ERROR LOOP
+	        MOV     #3$,@#PWRVEC    ;SETUP LOCATION 24
+	64$:    MOV     #1$,@#ERRVEC    ;SETUP ERRVEC
+	        MOV     #336,SP         ;SET THE SP TO RED ZONE
+	        MOV     #-1,R0          ;SETUP R0
+	        MOV     R0,(SP)         ;EXECUTE THE TRAP INSTRUCTION
+	6$:     MOV     #STACK,SP       ;RESET THE SP
+	        MOV     #CPUSPUR,@#ERRVEC   ;RESTORE ERRVEC
+	        ERROR   235             ;RED ZONE REFERENCE FAILED TO TRAP
+	        BR      8$
+	3$:     MOV     #STACK,SP       ;RESET THE SP
+			MOV     #CPUSPUR,@#ERRVEC   ;RESTORE LOCATION 4
+	        ERROR   237             ;BEN 13 FAILED TO PUP.00
+	        BR      8$
+	1$:     CMP     @#0,#6$         ;DID BEN 13 FAIL?
+			BEQ     7$              ;BRANCH IF NO
+			MOV     #STACK,SP       ;RESET THE SP
+			MOV     #CPUSPUR,@#ERRVEC   ;RESTORE ERRVEC
+			ERROR   240             ;BEN 13 FAILED TO BRK.80
+			BR      8$
+	7$:     CMP     #-1,@#336       ;;DID YEL ZONE OCCUR?
+			BNE     8$              ;BRANCH IF NO
+			CLR     @#336           ;SETUP FOR LOOPING
+			ERROR   251             ;YEL ZONE IN RED REGION
+	;
+	;TEST TO ENSURE PSW REFERENCE VIA THE SP CAUSES A RED ZONE TRAP
+	8$:     MOV     #63$,$LPERR     ;SETUP ERROR LOOP
+	63$:    MOV     #4$,@#ERRVEC    ;SETUP ERRVEC
+			MOV     #PSW,SP         ;PUT ADDRESS OF PSW IN SP
+			CLR     (SP)            ;EXECUTE THE TRAP CAUSING INSTRUCTION
+			MOV     #1076,SP        ;RESET THE SP
+			MOV     #CPUSPUR,@#ERRVEC   ;RESTORE ERRVEC
+			ERROR   241             ;NO RED ZONE ON STACK OVERFLOW
+
+PDPjs was failing to trigger a RED stack violation on this instruction:
+
+	R0=177777 R1=032435 R2=152110 R3=000024 R4=153352 R5=001164
+	SP=177776 PC=020632 PS=000350 IR=000000 SL=000377 T0 N1 Z0 V0 C0
+	020632: 005016                 CLR   @SP                    ;cycles=7
+
+so execution fell into `ERROR 241`.  This was resolved by updating the *checkStackLimit1145()* function
+in [cpustate.js](/modules/pdp11/lib/cpustate.js) to include stack addresses >= 177776 in the RED stack
+overflow range test.

modules/pdp11/lib/cpustate.js

@@ -1980,8 +1980,23 @@ CPUStatePDP11.prototype.checkStackLimit1145 = function(access, step, addr)
         /*
          * NOTE: The 11/70 CPU Instruction Exerciser does NOT expect reads to trigger a stack overflow,
          * so we check the access parameter.
+         *
+         * Moreover, TEST 40 of diagnostic EKBBF0 executes this instruction:
+         *
+         *      R0=177777 R1=032435 R2=152110 R3=000024 R4=153352 R5=001164
+         *      SP=177776 PC=020632 PS=000350 IR=000000 SL=000377 T0 N1 Z0 V0 C0
+         *      020632: 005016                 CLR   @SP                    ;cycles=7
+         *
+         * expecting a RED stack overflow trap.  Yes, using *any* addresses in the IOPAGE for the stack isn't
+         * a good idea, but who said it was illegal?  For now, we're going to restrict overflows to the highest
+         * address tested by the diagnostic (0xFFFE, aka the PSW), by making that address negative.
          */
+        if (addr >= 0xFFFE) addr |= ~0xFFFF;
         if ((access & PDP11.ACCESS.WRITE) && addr <= this.regSL) {
+            /*
+             * regSL can never fall below 0xFF, so this subtraction can never go negative, so this comparison
+             * is always safe.
+             */
             if (addr <= this.regSL - 32) {
                 this.trap(PDP11.TRAP.BUS, 0, PDP11.REASON.RED);
             } else {

versions/pdpjs/1.30.4/pdp11-dbg.js

@@ -133,7 +133,7 @@ function Zd(a){var b=ue(a),c=ue(a)&-1793;a.P&49152&&(c=c&-225|a.P&63712);T(a,b);
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versions/pdpjs/1.30.4/pdp11.js

@@ -122,7 +122,7 @@ function Sc(a){var b=Tc(a),c=Tc(a)&-1793;a.F&49152&&(c=c&-225|a.F&63712);Q(a,b);
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