RISC OS Open: Forum: ZeroPain in Obey

Oct 12, 2015 6:12am

Jon Abbott (1421) 2651 posts

Line 546 of exitsub in Obey is accessing Page Zero:

Time: Sun Oct 11 11:31:37 2015
Location: Offset 000002d4 in module Obey
Current Wimp task: Unknown
Last app to start: ShellCLI

R0  = 00000007 R1  = 00000000 R2  = 2026f694 R3  = 2023b704
R4  = 00000000 R5  = 80000000 R6  = 400000d3 R7  = 3a201f80
R8  = 200be000 R9  = 202be214 R10 = 000000d3 R11 = 00000c60
R12 = 30002e9c R13 = 2026f6ec R14 = 00000000 R15 = fc2816f0
DFAR = 00000000  Mode USR32  Flags nzCv if   PSR = 20000010

fc2816a8 : 01a0f00e : MOVEQ   PC,R14
fc2816ac : e52de004 : STR     R14,[R13,#-4]!
fc2816b0 : eb000198 : BL      &FC281D18
fc2816b4 : e3a0000b : MOV     R0,#&0B            ; =11
fc2816b8 : e59b101c : LDR     R1,[R11,#28]
fc2816bc : e59b2020 : LDR     R2,[R11,#32]
fc2816c0 : ef020040 : SWI     XOS_ChangeEnvironment
fc2816c4 : e3a00006 : MOV     R0,#6
fc2816c8 : e59b1024 : LDR     R1,[R11,#36]
fc2816cc : e59b2028 : LDR     R2,[R11,#40]
fc2816d0 : e59b302c : LDR     R3,[R11,#44]
fc2816d4 : ef020040 : SWI     XOS_ChangeEnvironment
fc2816d8 : e3a00007 : MOV     R0,#7
fc2816dc : e1a0200b : MOV     R2,R11
fc2816e0 : e592b000 : LDR     R11,[R2,#0]
fc2816e4 : e24ce000 : SUB     R14,R12,#0
fc2816e8 * e59e1000 * LDR     R1,[R14,#0]
fc2816ec : e1310002 : TEQ     R1,R2
fc2816f0 : 11a0e001 : MOVNE   R14,R1
fc2816f4 : 1afffffb : BNE     &FC2816E8
fc2816f8 : e58eb000 : STR     R11,[R14,#0]
fc2816fc : ef02001e : SWI     XOS_Module
fc281700 : e59ce000 : LDR     R14,[R12,#0]
fc281704 : e33e0000 : TEQ     R14,#0
fc281708 : 1a000008 : BNE     &FC281730
fc28170c : e3a00001 : MOV     R0,#1
fc281710 : e24f10c0 : ADR     R1,&FC281658
fc281714 : e2411004 : SUB     R1,R1,#4
fc281718 : e1a0200c : MOV     R2,R12
fc28171c : ef020020 : SWI     XOS_Release
fc281720 : e3a0001d : MOV     R0,#&1D            ; =29
fc281724 : e24f1f62 : ADR     R1,&FC2815A4

Oct 12, 2015 12:35pm

Jeffrey Lee (213) 6048 posts

Corresponding source is here

Do you have a way to reproduce that one? Fixing it to check for the end of the list is easy, but I’m curious why the code is reaching the end of the list at all. I’d guess that exitsub is being called twice for the same obey file somehow.

Oct 12, 2015 1:09pm

Jon Abbott (1421) 2651 posts

Not yet, although I am trying to get a Repro for you. I’m still not sure what’s triggering it as it seems intermittent.

ZeroPain in Obey

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Oct 12, 2015 6:12am Jon Abbott (1421) 2651 posts	Line 546 of exitsub in Obey is accessing Page Zero: `Time: Sun Oct 11 11:31:37 2015 Location: Offset 000002d4 in module Obey Current Wimp task: Unknown Last app to start: ShellCLI` `R0 = 00000007 R1 = 00000000 R2 = 2026f694 R3 = 2023b704 R4 = 00000000 R5 = 80000000 R6 = 400000d3 R7 = 3a201f80 R8 = 200be000 R9 = 202be214 R10 = 000000d3 R11 = 00000c60 R12 = 30002e9c R13 = 2026f6ec R14 = 00000000 R15 = fc2816f0 DFAR = 00000000 Mode USR32 Flags nzCv if PSR = 20000010` fc2816a8 : 01a0f00e : MOVEQ PC,R14 fc2816ac : e52de004 : STR R14,[R13,#-4]! fc2816b0 : eb000198 : BL &FC281D18 fc2816b4 : e3a0000b : MOV R0,#&0B ; =11 fc2816b8 : e59b101c : LDR R1,[R11,#28] fc2816bc : e59b2020 : LDR R2,[R11,#32] fc2816c0 : ef020040 : SWI XOS_ChangeEnvironment fc2816c4 : e3a00006 : MOV R0,#6 fc2816c8 : e59b1024 : LDR R1,[R11,#36] fc2816cc : e59b2028 : LDR R2,[R11,#40] fc2816d0 : e59b302c : LDR R3,[R11,#44] fc2816d4 : ef020040 : SWI XOS_ChangeEnvironment fc2816d8 : e3a00007 : MOV R0,#7 fc2816dc : e1a0200b : MOV R2,R11 fc2816e0 : e592b000 : LDR R11,[R2,#0] fc2816e4 : e24ce000 : SUB R14,R12,#0 fc2816e8 * e59e1000 * LDR R1,[R14,#0] fc2816ec : e1310002 : TEQ R1,R2 fc2816f0 : 11a0e001 : MOVNE R14,R1 fc2816f4 : 1afffffb : BNE &FC2816E8 fc2816f8 : e58eb000 : STR R11,[R14,#0] fc2816fc : ef02001e : SWI XOS_Module fc281700 : e59ce000 : LDR R14,[R12,#0] fc281704 : e33e0000 : TEQ R14,#0 fc281708 : 1a000008 : BNE &FC281730 fc28170c : e3a00001 : MOV R0,#1 fc281710 : e24f10c0 : ADR R1,&FC281658 fc281714 : e2411004 : SUB R1,R1,#4 fc281718 : e1a0200c : MOV R2,R12 fc28171c : ef020020 : SWI XOS_Release fc281720 : e3a0001d : MOV R0,#&1D ; =29 fc281724 : e24f1f62 : ADR R1,&FC2815A4

Oct 12, 2015 12:35pm Jeffrey Lee (213) 6048 posts	Corresponding source is here Do you have a way to reproduce that one? Fixing it to check for the end of the list is easy, but I’m curious why the code is reaching the end of the list at all. I’d guess that exitsub is being called twice for the same obey file somehow.

Oct 12, 2015 1:09pm Jon Abbott (1421) 2651 posts	Not yet, although I am trying to get a Repro for you. I’m still not sure what’s triggering it as it seems intermittent.