RISC OS Open: Forum: Unexpected abort in Utility module

Oct 5, 2023 2:46pm

Alan Adams (2486) 1149 posts

A program which has been running regularly for over a year has just started aborting at the first WimpPollIdle. The progfram hasn’t changed, and it sometimes does work. It’s written in BASIC. RISC OS version is 5.29, 22-Dec-22. The abort details are:
<pre>


Reporter 2.72 (15 Aug 2020)     List              Thu 5th Oct 2023  15:40
~pollmask%=&40F830 ~wimpblock%=&23B10 ~then%=&2FABA ~reason%
Memory: Prog=20,798 Vars=122,520 Free=262,392 Stack=48 Undefined=0 Slot=400K

15:40:15.74 * Error *

  Error  : &80000002

  Message: Internal error: abort on data transfer at &FC038850

	
		Error ** ERR=&80000002 Internal error: abort on data transfer at &FC038850 ERL=76

Address &FC038858 in Module   UtilityModule       @ &FC020584 + &182D4

Register dump (at &20003110) is:

pc  = &FC038858  Flags=&60000113=nZCv if  Mode=SVC 32 bit

r0  = &F78E4D3C : <MŽ÷ : 4153298236

r1  = &00000000 : …. :          0

r2  = &00DDDDDD : ÝÝÝ. :   14540253

r3  = &00DDDDDD : ÝÝÝ. :   14540253

r4  = &00DDDDDD : ÝÝÝ. :   14540253

r5  = &3B7EEFFC : üï~; :  998174716

r6  = &00000000 : …. :          0

r7  = &00000020 :  … :         32

r8  = &00DDDDDD : ÝÝÝ. :   14540253

r9  = &00DDDDDD : ÝÝÝ. :   14540253

r10 = &00DDDDDD : ÝÝÝ. :   14540253

r11 = &00DDDDDD : ÝÝÝ. :   14540253

r12 = &FFFF12B0 : °… : 4294906544 => &F775BD48 : H½u÷ : 4151688520

r13 = &FA207EE4 : ä~ ú : 4196433636

r14 = &FC038750 : P‡.ü : 4228089680 => &E59C52B8 : ¸Rœå : 3852227256

Code around address is:

FC038820 : E1A08638 : 8† á : MOV     R8,R8,LSR R6

FC038824 : E1888719 : .‡ˆá : ORR     R8,R8,R9,LSL R7

FC038828 : E1A09639 : 9– á : MOV     R9,R9,LSR R6

FC03882C : E189971A : .—‰á : ORR     R9,R9,R10,LSL R7

FC038830 : E1A0A63A : :¦ á : MOV     R10,R10,LSR R6

FC038834 : E18AA71B : .§Šá : ORR     R10,R10,R11,LSL R7

FC038838 : E1A0B63B : ;¶ á : MOV     R11,R11,LSR R6

FC03883C : E18BB71E : .·‹á : ORR     R11,R11,R14,LSL R7

FC038840 : E8A00F1C : .. è : STMIA   R0!,{R2-R4,R8-R11}

FC038844 : E2511007 : ..Qâ : SUBS    R1,R1,#7

FC038848 : AAFFFFEC : ì..ª : BGE     &FC038800

FC03884C : E2911007 : ..‘â : ADDS    R1,R1,#7

FC038850 > E895000C > ..•è : LDMIA   R5,{R2,R3}

FC038854 : E2855004 : .P…â : ADD     R5,R5,#4

FC038858 : E1A02632 : 2& á : MOV     R2,R2,LSR R6

FC03885C : E1822713 : .’‚á : ORR     R2,R2,R3,LSL R7
	
Reporter 2.72 (15 Aug 2020)     Listed 82 lines

Oct 5, 2023 2:57pm

Stuart Swales (8827) 1357 posts

Offhand, without a modern memory map to hand, I’d say that it’s never encountered an address so close to the end of a page like &3B7EEFFC before. Reading beyond end of page of some dynamic area / heap?

Oct 5, 2023 3:13pm

Alan Adams (2486) 1149 posts

so the polling loop follows. The error occurs on the WimpPoll line.
<pre>


pollmask%= (1<<4) + (1<<5) + (1<<11) + (1<<12) + (1<<13) + (1<<14) + (1<<15) + (1<<22)
REPEAT

quit%=FALSE

  SYS “OS_ReadMonotonicTime” TO now%

  then%=now%+polltime%

  IF DEBUG% THEN

    *report ~pollmask% ~wimpblock% ~then% ~reason%

    *REPORTMEM

  ENDIF

  !wimpblock%=0

  reason%=0

  SYS “Wimp_PollIdle”,pollmask%,wimpblock%,then% TO reason%

REM IF (DEBUG%AND1)  THEN *report reason% now% nextlogtime%

CASE reason% OF

WHEN 0: PROCnull(wimpblock%)

WHEN 1: PROCredraw(wimpblock%)

WHEN 2: PROCopen(wimpblock%)

WHEN 3: PROCclose(wimpblock%)

WHEN 6: PROCclick(wimpblock%)

WHEN 7: PROCenddrag(wimpblock%)

WHEN 8: PROCkey(wimpblock%)

WHEN 9: PROCmenu(wimpblock%)

WHEN 17,18,19: PROCmessage(wimpblock%)

ENDCASE

UNTIL quit%

PROCclosedown

END
I tried ensuring wimpblock and reason contained something sane, that made no difference.

Oct 5, 2023 3:43pm

Rick Murray (539) 13840 posts

Does a debugger annotated dump provide any further info?

Oct 5, 2023 3:55pm

Stuart Swales (8827) 1357 posts

Julie wrote a logical memory map dumper – why not try that to see where the block R5 points to is located?

https://www.riscosopen.co.uk/forum/forums/11/topics/15501

Oct 5, 2023 4:03pm

Graeme (8815) 106 posts

Your pollmask has bit 22 set to say you have a pollword in R3 but you are not setting the pollword. BASIC will set it to zero. It doesn’t look like your program is using pollwords because you mask them out by setting bit 13 and have no WHEN 13 statement.

Is it possible the Wimp is trying to load from memory address zero and being blocked?

It doesn’t seem to match the assembler output so it may not be the issue.

Oct 5, 2023 5:46pm

Alan Adams (2486) 1149 posts

Your pollmask has bit 22 set to say you have a pollword in R3 but you are not setting the pollword. BASIC will set it to zero.

So I’ve removed the bit 22 from the pollmask – still mostly fails. It does occasionally work, which is worrying, as that suggests it’s working by accident, picking up some random value from somewhere.

Oct 5, 2023 5:50pm

Alan Adams (2486) 1149 posts

I tried *memory 3B7EEFFC, which returned abort on data transfer at &FC1EF6CC, which is similar to, but not the same as, the abort from the program.

Wimp_Poll only uses R0 to R3, so that’s not where R5 gets set.

Before the first Wimp_poll there are a number of calls to IIC_Control – could they be leaving something in R5?

Oct 5, 2023 5:53pm

Stuart Swales (8827) 1357 posts

If you can identify the block containing 3B7EEFFC (the owner will vary no doubt by platform / usage) it might give a hint as to what’s accessing it.

Oct 5, 2023 5:58pm

Rick Murray (539) 13840 posts

I’m not at the computer so my memory may be faulty, but I think there’s also the syntax:

*Memory S 3B7EEFFC

to perform the access in supervisor mode, in case it’s something the OS can get to buy users can’t.

Worth a try…

could they be leaving something in R5?

If you’re using BASIC, it’s a sanitised environment. That is to say, registers not explicitly set will be set to zero.
The registers that you are seeing here are going to be something internal to the Wimp, or the OS, depends where it went.

See if Debugger can help → https://www.riscosopen.org/wiki/documentation/show/Debugger%20Annotated%20Exception%20Dumps

Oct 5, 2023 6:03pm

Stuart Swales (8827) 1357 posts

Lo and behold it is sprite plotting code that’s faulting. See PutSprite in vdugrafg:

https://gitlab.riscosopen.org/RiscOS/Sources/Kernel/-/blob/master/s/vdu/vdugrafg#L1187

probably

https://gitlab.riscosopen.org/RiscOS/Sources/Kernel/-/blob/master/s/vdu/vdugrafg#L1325

2p says that it’s down to the combination of sprite files loaded at that moment. Please tell me the address is the Wimp Sprite Pool…

Oct 5, 2023 6:04pm

Rick Murray (539) 13840 posts

Why would Wimp Poll be involving that?

Oct 5, 2023 6:05pm

Alan Adams (2486) 1149 posts

If you can identify the block containing 3B7EEFFC (the owner will vary no doubt by platform / usage) it might give a hint as to what’s accessing it.

The platform is an rPi 3B+; I’m using the IIC interface to talk to an IIC-to-one-wire adapter. Prior to the Wimp_Poll I interrogate the possible adapter addresses on the IIC bus (there are 4 possible values).

However removing those calls to IIC made no difference.

Could that address be for the GPIO hardware?

Oct 5, 2023 6:05pm

Stuart Swales (8827) 1357 posts

Why would Wimp Poll be involving that?

It isn’t, it’s redrawing something else and wandering off the end of the sprite data, which has somehow got to the end of a page with no page beyond that one.

*Memory S

Your are thinking of the P option perhaps, to access Physical addresses. The Debugger IS in supervisor mode.

Oct 5, 2023 6:25pm

Alan Adams (2486) 1149 posts

I have now managed to get a debugger dump. Does it mean anything?

<pre> Error block: 80000002 Internal error: abort on data transfer at &FC038850 R0 = f78e4a7c R1 = 00000000 R2 = 00dddddd R3 = 00dddddd R4 = 00dddddd R5 = 3b7eeffc R6 = 00000000 R7 = 00000020 R8 = 00dddddd R9 = 00dddddd R10 = 00dddddd R11 = 00dddddd R12 = ffff12b0 R13 = fa207ee4 R14 = fc038750 R15 = fc038858 CPSR = 60000113 R13_usr = 201e00b4 R14_usr = 201d7388 R13_svc = fa207ee4 R14_svc = fc038750 SPSR_svc = 20000113 R13_irq = fa102000 R14_irq = 20000113 SPSR_irq = 20000113 R13_abt = fa301fa8 R14_abt = fc038858 SPSR_abt = 60000113 R13_und = fa402000 R14_und = fc1739d0 SPSR_und = 60000113 OSMem16: 2 = fa100000, 00002000, 00002000 OSMem16: 3 = fa200000, 00008000, 00008000 OSMem16: 4 = fa300000, 00002000, 00002000 OSMem16: 5 = fa400000, 00002000, 00002000 Memory: fa100000 - fa102000 Memory: fa200000 - fa208000 Memory: fa300000 - fa302000 Memory: fa400000 - fa402000 Memory: ffff0108 - ffff010c OSRSI6: 69 = ffff0108


R15 = fc038858 = UtilityModule +182d4

R14_svc = fc038750 = UtilityModule +181cc
SVC stack:

fa207ee4 : ffff1000 :

fa207ee8 : fc037cac :

fa207eec : 00000001 :

fa207ef0 : ffffff8c :

fa207ef4 : 00000200 :

fa207ef8 : 0000000b :

fa207efc : 00000201 :

fa207f00 : ffffff8c :

fa207f04 : 00000400 :

fa207f08 : 0000000b :

fa207f0c : 00000002 :

fa207f10 : 00000201 :

fa207f14 : 00000000 :

fa207f18 : ffff0854 :

fa207f1c : ffff1000 :

fa207f20 : fc037c68 : – fc037c74 return to fc037c68?

         :          : | fc037c74 = UtilityModule +176f0

         :          : | fc037c68 = UtilityModule +176e4

fa207f24 : 60000113 : – PSR?

fa207f28 : 0002002e : | SWI XOS_SpriteOp

fa207f2c : fc16b9e4 : | R14: fc16b9e4

         :          : | = WindowManager +f2c4

fa207f30 : 20c1ced8 : | R10

fa207f34 : 00000122 : | R11

fa207f38 : 2001e174 : | R12

fa207f3c : fc16b978 : – R14: fc16b978 (ASM call to fc16b9b8)

         :          : | fc16b978 = WindowManager +f258

         :          : | fc16b9b8 = WindowManager +f298

fa207f40 : 1700318b : – R1

fa207f44 : 00000000 : | R2

fa207f48 : 20c1cf18 : | R11

fa207f4c : fc16b950 : | R14: fc16b950 (ASM call to fc16b954)

         :          : | fc16b950 = WindowManager +f230

         :          : | fc16b954 = WindowManager +f234

fa207f50 : 1700318b : – R1

fa207f54 : 00000018 : | R5

fa207f58 : 000004be : | R6

fa207f5c : 00000008 : | R7

fa207f60 : fc16b148 : | R14: fc16b148 (ASM call to fc16b914)

         :          : | fc16b148 = WindowManager +ea28

         :          : | fc16b914 = WindowManager +f1f4

fa207f64 : 20ba57d9 : – R0

fa207f68 : 1700318b : | R1

fa207f6c : 0002502c : | R2

fa207f70 : 00000084 : | R3

fa207f74 : 000007fe : | R4

fa207f78 : 00000084 : | R5

fa207f7c : fc16a544 : | R14: fc16a544 (ASM call to fc16b074)

         :          : | fc16a544 = WindowManager +de24

         :          : | fc16b074 = WindowManager +e954

fa207f80 : 00000000 :

fa207f84 : 20000113 :

fa207f88 : 000007fe : – R4

fa207f8c : 00000084 : | R5                                       – R2

fa207f90 : fc16a454 : | R14: fc16a454 (ASM call to fc16a510)     | R3

         :          : | fc16a454 = WindowManager +dd34           | 

         :          : | fc16a510 = WindowManager +ddf0           | 

fa207f94 : 00000002 :                                            | R4

fa207f98 : 00000018 :                                            | R5

fa207f9c : fc16995c :                                            | R14: fc16995c (ASM call to fc16a3e0)

         :          :                                            | fc16995c = WindowManager +d23c

         :          :                                            | fc16a3e0 = WindowManager +dcc0

fa207fa0 : 20ba57d8 :

fa207fa4 : 201e01b4 :

fa207fa8 : fc1661cc : – R14: fc1661cc (ASM call to fc1697c4)

         :          : | fc1661cc = WindowManager +9aac

         :          : | fc1697c4 = WindowManager +d0a4

fa207fac : fc167194 : – R14: fc167194 (ASM call to fc1661b4)

         :          : | fc167194 = WindowManager +aa74

         :          : | fc1661b4 = WindowManager +9a94

fa207fb0 : 201e01b4 :

fa207fb4 : ffffec2c :

fa207fb8 : 201dfeb8 :

fa207fbc : 00000012 :

fa207fc0 : ffffe718 :

fa207fc4 : 00000208 :

fa207fc8 : 000000c2 :

fa207fcc : 00885501 :

fa207fd0 : 20ba47b4 :

fa207fd4 : fc15e608 : – Return to fc15e608?

         :          : | = WindowManager +1ee8

fa207fd8 : 00000007 :

fa207fdc : 000039f4 :

fa207fe0 : fa207fb0 :

fa207fe4 : fc0106a8 : – fc0176c0 return to fc0106a8?

         :          : | fc0176c0 = +176c0 in the Kernel

         :          : | fc0106a8 = +106a8 in the Kernel

fa207fe8 : 60000110 : – PSR?

fa207fec : 000400c7 : | SWI Wimp_Poll

fa207ff0 : 201d7308 : | R14: 201d7308

         :          : | = Reporter +a94

         :          : | = Poll +24

fa207ff4 : 40000110 : | R10

fa207ff8 : 00000910 : | R11

fa207ffc : 201dfeb4 : | R12
R14_usr = 201d7388 = Reporter +b14 = Poll +a4

          Function call to 201de314 = Reporter +7aa0 = OSModX +a8
USR stack:

201e00b4 : 6172011b :

201e00b8 : 523a3a6d :

201e00bc : 69646d61 :

201e00c0 : 2e306373 :

201e00c4 : 65522e24 :

201e00c8 : 74726f70 :

201e00cc : 65766153 :

201e00d0 : 00003130 :

201e00d4 : 00000000 :

201e00d8 : 00000000 :

201e00dc : 00000000 :

201e00e0 : 00000000 :

201e00e4 : 00000000 :

201e00e8 : 00000000 :

201e00ec : 00000000 :

201e00f0 : 00000000 :

201e00f4 : 00000000 :

201e00f8 : 00000000 :

201e00fc : 00000000 :

201e0100 : 00000000 :

201e0104 : 00000000 :

201e0108 : 00000000 :

201e010c : 00000000 :

201e0110 : 00000000 :

201e0114 : 00000000 :

201e0118 : 00000000 :

201e011c : 00000000 :

201e0120 : 00000000 :

201e0124 : 00000000 :

201e0128 : 00000000 :

201e012c : 00000000 :

201e0130 : 00000000 :

201e0134 : 61720019 :

201e0138 : 61723a6d :

201e013c : 7369646d :

201e0140 : 242e3063 :

201e0144 : 7065522e :

201e0148 : 4c74726f :

201e014c : 0030676f :

201e0150 : 00000000 :

201e0154 : 00000000 :

201e0158 : 00000000 :

201e015c : 00000000 :

201e0160 : 00000000 :

201e0164 : 00000000 :

201e0168 : 00000000 :

201e016c : 00000000 :

201e0170 : 00000000 :

201e0174 : 00000000 :

201e0178 : 00000000 :

201e017c : 00000000 :

201e0180 : 00000000 :

201e0184 : 00000000 :

201e0188 : 00000000 :

201e018c : 00000000 :

201e0190 : 00000000 :

201e0194 : 00000000 :

201e0198 : 00000000 :

201e019c : 00000000 :

201e01a0 : 00000000 :

201e01a4 : 00000000 :

201e01a8 : 00000000 :

201e01ac : 00000000 :

201e01b0 : 00000000 :

201e01b4 : 20bf0fb9 :

201e01b8 : 00000002 :

201e01bc : 000000c2 :

201e01c0 : 00000678 :

201e01c4 : 000005d6 :

201e01c8 : 00000000 :

201e01cc : ffffec2c :

201e01d0 : 00000002 :

201e01d4 : 000000c2 :

201e01d8 : 00000678 :

201e01dc : 000005d6 :

201e01e0 : 00776f64 :

201e01e4 : 00000000 :

201e01e8 : 00000000 :

201e01ec : 00000000 :

201e01f0 : 00000000 :

201e01f4 : 00000000 :

201e01f8 : 00000000 :

201e01fc : 00000000 :

201e0200 : 00000000 :

201e0204 : 00000000 :

201e0208 : 00000000 :

201e020c : 00000000 :

201e0210 : 00000000 :

201e0214 : 00000000 :

201e0218 : 00000000 :

201e021c : 00000000 :

201e0220 : 00000000 :

201e0224 : 00000000 :

201e0228 : 00000000 :

201e022c : 00000000 :

201e0230 : 00000000 :

201e0234 : 00000000 :

201e0238 : 00000000 :

201e023c : 00000000 :

201e0240 : 00000000 :

201e0244 : 00000000 :

201e0248 : 00000000 :

201e024c : 00000000 :

201e0250 : 00000000 :

201e0254 : 00000000 :

201e0258 : 00000000 :

201e025c : 00000000 :

201e0260 : 00000000 :

201e0264 : 00000000 :

201e0268 : 00000000 :

201e026c : 00000000 :

201e0270 : 00000000 :

201e0274 : 00000000 :

201e0278 : 00000000 :

201e027c : 00000000 :

201e0280 : 00000000 :

201e0284 : 00000000 :

201e0288 : 00000000 :

201e028c : 00000000 :

201e0290 : 00000000 :

201e0294 : 00000000 :

201e0298 : 00000000 :

201e029c : 00000000 :

201e02a0 : 00000000 :

201e02a4 : 00000000 :

201e02a8 : 00000000 :

201e02ac : 00000000 :

201e02b0 : 00000000 :

201e02b4 : 6172541c :

201e02b8 : 40206563 :

201e02bc : 444e4520 :

201e02c0 : 434f5250 :

201e02c4 : 6d690000 :

201e02c8 : 00000065 :

201e02cc : 00007700 :

201e02d0 : 72000073 :

201e02d4 : 6c700000 :

201e02d8 : 00007465 :

201e02dc : 00000000 :

201e02e0 : 00000000 :

201e02e4 : 00000000 :

201e02e8 : 00000000 :

201e02ec : 00000000 :

201e02f0 : 00000000 :

201e02f4 : 00000000 :

201e02f8 : 00000000 :

201e02fc : 00000000 :

201e0300 : 00000000 :

201e0304 : 00000000 :

201e0308 : 00000000 :

201e030c : 00000000 :

201e0310 : 00000000 :

201e0314 : 00000000 :

201e0318 : 00000000 :

201e031c : 00000000 :

201e0320 : 00000000 :

201e0324 : 00000000 :

201e0328 : 00000000 :

201e032c : 00000000 :

201e0330 : 00000000 :

201e0334 : 00000000 :

201e0338 : 00000000 :

201e033c : 00000000 :

201e0340 : 00000000 :

201e0344 : 00000000 :

201e0348 : 00000000 :

201e034c : 00000000 :

201e0350 : 00000000 :

201e0354 : 00000000 :

201e0358 : 00000000 :

201e035c : 00000000 :

201e0360 : 00000000 :

201e0364 : 00000000 :

201e0368 : 00000000 :

201e036c : 00000000 :

201e0370 : 00000000 :

201e0374 : 00000000 :

201e0378 : 00000000 :

201e037c : 00000000 :

201e0380 : 00000000 :

201e0384 : 00000000 :

201e0388 : 00000000 :

201e038c : 00000000 :

201e0390 : 00000000 :

201e0394 : 00000000 :

201e0398 : 00000000 :

201e039c : 00000000 :

201e03a0 : 00000000 :

201e03a4 : 00000000 :

201e03a8 : 00000000 :

201e03ac : 00000000 :

201e03b0 : 00000000 :

201e03b4 : 202a2a1b :

201e03b8 : 6f727245 :

201e03bc : 2a2a2072 :

201e03c0 : 52524520 :

201e03c4 : 3038263d :

201e03c8 : 30303030 :

201e03cc : 49203230 :

201e03d0 : 7265746e :

201e03d4 : 206c616e :

201e03d8 : 6f727265 :

201e03dc : 61203a72 :

201e03e0 : 74726f62 :

201e03e4 : 206e6f20 :

201e03e8 : 61746164 :

201e03ec : 61727420 :

201e03f0 : 6566736e :

201e03f4 : 74612072 :

201e03f8 : 43462620 :

201e03fc : 38383330 :

201e0400 : 45203035 :

201e0404 : 373d4c52 :

201e0408 : 69570036 :

201e040c : 694c6572 :

201e0410 : 45202262 :

201e0414 : 313d4c52 :

201e0418 : 00003134 :

201e041c : 00000000 :

201e0420 : 00000000 :

201e0424 : 00000000 :

201e0428 : 00000000 :

201e042c : 00000000 :

201e0430 : 00000000 :

201e0434 : 00000000 :

201e0438 : 00000000 :

201e043c : 00000000 :

201e0440 : 00000000 :

201e0444 : 00000000 :

201e0448 : 00000000 :

201e044c : 00000000 :

201e0450 : 00000000 :

201e0454 : 00000000 :

201e0458 : 00000000 :

201e045c : 00000000 :

201e0460 : 00000000 :

201e0464 : 00000000 :

201e0468 : 00000000 :

201e046c : 00000000 :

201e0470 : 00000000 :

201e0474 : 00000000 :

201e0478 : 00000000 :

201e047c : 00000000 :

201e0480 : 00000000 :

201e0484 : 00000000 :

201e0488 : 00000000 :

201e048c : 00000000 :

201e0490 : 00000000 :

201e0494 : 00000000 :

201e0498 : 00000000 :

201e049c : 00000000 :

201e04a0 : 00000000 :

201e04a4 : 00000000 :

201e04a8 : 00000000 :

201e04ac : 00000000 :

201e04b0 : 00000000 :
End of dump

Oct 5, 2023 6:40pm

Stuart Swales (8827) 1357 posts

SWI XOS_SpriteOp ;-)

Oct 5, 2023 6:52pm

Alan Adams (2486) 1149 posts

SWI XOS_SpriteOp ;-)

Called from Wimp_PollIdle?

Oct 5, 2023 6:54pm

Stuart Swales (8827) 1357 posts

Called from Wimp_PollIdle?

Yeah, why not? You’ve yielded control to the Window Manager, and it’s off doing other things.

Oct 5, 2023 7:04pm

Alan Adams (2486) 1149 posts

So I’ve commented out all the IIC code that was occurring before the first Wimp_Poll. The error still occurs on the rPi.

I’ve tried running it on the ARMX6, where it successfully opens the window and polls. As it hasen’t found any hardware addresses (code commented out, hardware not present) it can’t do more.

The original code works on a different rPi 3B+, including successfully getting data over the one-wire bus. That’s running the same OS version – in fact it’s running a clone of the same SD card.

Uh!

Oct 5, 2023 7:07pm

Stuart Swales (8827) 1357 posts

My Pi is a bit buried at the mo – could you try seeing what running the memory map dumper outputs?

https://www.riscosopen.co.uk/forum/forums/11/topics/15501

I’m 99% sure its the Wimp Sprite Pool. Are you IconSprites-ing anything when running your program each time?

running a clone of the same SD card

100% clone? ;-) Does it fail on the other system when run a sufficient number of times? Swap cards over?

Oct 5, 2023 7:14pm

Alan Adams (2486) 1149 posts

I’ve now tried Julie’s memorymap program. The address 3b7eeffc appears to be in the wimp sprite pool.

Oct 5, 2023 7:18pm

Stuart Swales (8827) 1357 posts

Aha. Can you *Save the Wimp Sprite Pool out? We could have a grok to see if the last sprite in there is invalid in some way to provoke the VDU driver fault.

Oct 5, 2023 7:53pm

Alan Adams (2486) 1149 posts

The program fails on the origonal pi from a cold start. It does nothing with the sprite pool. There are no sprites used in its templates.

The fault moves with the SD card.

HOWEVER:
During startup each is running an obey file which pins another of my applications to the desktop. That application has its own sprites.
If I comment that line out, the program works. If I then run that obey file, with the line active, the program crashes as before.

So the question now is “What is going wrong with the sprite handling?”
And “Why does the same thing work when used from a different SD card, when the cards were originally clones?”

I’ve replaced the sprites file in question with one from a machine that doesn’t have the problem. No change. This is not really surprising as both the date and the size were identical.

Instead of pinning the application, I changed the startup to run a program from that set. That program loads a different icon from the same sprite file to the iconbar. Doing that causes the problem to occur.

So remove references to the sprite file and reboot.
Run the program that crashes – no crash.
Run any of the programs that use sprites from that sprite file, then the test program. Test crashes.
The !sprites file contains six sprites.
Each program starts with “iconsprites <obey$dir>.!Sprites”

The !Run files are identical between the two SD cards, yet only one behaves itself.

Oct 5, 2023 7:54pm

Alan Adams (2486) 1149 posts

Can you *Save the Wimp Sprite Pool out?

How would I do that please?

I’ve tried *save spritepool 3b603000 3c502fff and got “no readable memory at this address”. This was done on the machine that doesn’t have the problem. The addresses and error message are the same on the problem machine (or rasther SD card).

That odd address in R5 is in the wimp sprite pool, not the system sprites, so that’s the area I’m trying to save.

Oct 5, 2023 8:13pm

Rick Murray (539) 13840 posts

Wimp_ReadSysInfo 16 will give the low and high priority sprite areas in R0 and R1 respectively.

Use OS_SpriteOp to save ’em.

Off the top of my head:

SYS "Wimp_ReadSysInfo", 16 TO low%, high%
SYS "OS_SpriteOp", 12+256, low%, "$.wimpslow"
SYS "OS_SpriteOp", 12+256, high%, "$.wimpshigh"

Unexpected abort in Utility module

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