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Old 02 May 2022, 00:45   #1
jotd
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memory watch not working properly

I'm using memory watches for a while now it's been working perfect and saved me a lot of time.

Today I notice that it's failing me (latest winuae)


Code:
  D0 00000052   D1 00000320   D2 0002FFFF   D3 00000002
  D4 00000007   D5 FFFFFFFF   D6 00000000   D7 FFFF013F
  A0 000780B0   A1 00051156   A2 001837CC   A3 00004F00
  A4 00005300   A5 00002A64   A6 00005400   A7 47FDEFE0
USP  001FFC00 ISP  47FDEFE0 SFC  00000005 DFC  00000005
CACR 80008000 TC   00008000 ITT0 00000000 ITT1 00000000
DTT0 00000000 DTT1 00000000 VBR  47FCF000 MSP  001FF800
MMUS 00000000 URP  47FDCE00 SRP  47FDCE00
T=00 S=1 M=0 X=0 N=0 Z=0 V=0 C=0 IMASK=1 STP=0
0: 7FFF-7FFFFFFF-FFFFF800 +nan 7FFF-7FFFFFFF-FFFFF800 +nan
2: 7FFF-7FFFFFFF-FFFFF800 +nan 7FFF-7FFFFFFF-FFFFF800 +nan
4: 7FFF-7FFFFFFF-FFFFF800 +nan 7FFF-7FFFFFFF-FFFFF800 +nan
6: 7FFF-7FFFFFFF-FFFFF800 +nan 7FFF-7FFFFFFF-FFFFF800 +nan
FPSR: 00000000 FPCR: 00000000 FPIAR: 00000000 N=0 Z=0 I=0 NAN=0
Prefetch Chip latch 0000FFFE
001831f8 3419                     move.w (a1)+ [cccc],d2
Next PC: 001831fa
>w 0 $8000 $520c8-$8000
 0: 00008000 - 000520C7 (303304) RWI CPU
>g
Memwatch 0: break at 00008000.L R   00000000 PC=47FC533E CPUDR (000)
  D0 CCCCCCCC   D1 00032000   D2 80008000   D3 00000032
  D4 00DFF000   D5 FFFFFF00   D6 47FC4C5E   D7 FFFF027F
  A0 47FC530E   A1 00DFF000   A2 47FD52F8   A3 47FD544C
  A4 47FCE000   A5 00008000   A6 4095B7F8   A7 40943E5C
USP  40943E58 ISP  40943E5C SFC  00000000 DFC  00000000
CACR 00008000 TC   00000000 ITT0 00000000 ITT1 00000000
DTT0 00000000 DTT1 00000000 VBR  40073330 MSP  00000000
MMUS 00000000 URP  40075000 SRP  40075000
T=00 S=1 M=0 X=0 N=1 Z=0 V=0 C=0 IMASK=7 STP=0
0: 7FFF-7FFFFFFF-FFFFF800 +nan 7FFF-7FFFFFFF-FFFFF800 +nan
2: 7FFF-7FFFFFFF-FFFFF800 +nan 7FFF-7FFFFFFF-FFFFF800 +nan
4: 7FFF-7FFFFFFF-FFFFF800 +nan 7FFF-7FFFFFFF-FFFFF800 +nan
6: 7FFF-7FFFFFFF-FFFFF800 +nan 7FFF-7FFFFFFF-FFFFF800 +nan
FPSR: 00000000 FPCR: 00000000 FPIAR: 00000000 N=0 Z=0 I=0 NAN=0
Prefetch Chip latch 0000012C
47fc533e 2015                     move.l (a5) [cccccccc],d0
47fc5340 2ad6                     move.l (a6) [00000000],(a5)+ [cccccccc]
Next PC: 47fc5342

A1 = 00051156
watchpoint on memory range: 0: 00008000 - 000520C7 (303304) RWI CPU


001831f8 3419 move.w (a1)+ [cccc],d2

does not trigger watchpoint !!!!! (the bogus data is cccc it's located in the zone where the watchpoint is)

After that, quitting game (whdload) triggers watchpoint when whdload restores memory first at $8000 so it works. But not at the "high" address.

I used that watchpoint successfully for all day. What's the issue? (JIT is off of course). Is there a silent size limit?
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Old 02 May 2022, 21:20   #2
Rock'n Roll
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w <num> <address> <length> [other options]

this $520c8-$8000 for length could be wrong?
what is the range for the watchpoint?
start: $8000 and end: ?

try this:
>w 0 8000 4a0c8
0: 00008000 - 000520C7 (303304) RWI CPU
>
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Old 02 May 2022, 21:32   #3
jotd
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nope, this is broken

Code:
>w 0 $8000 $520c8-$8000
 0: 00008000 - 000520C7 (303304) RWI CPU
same output as yours (winuae arguments are evaluated)

I can confirm that it doesn't work. Using whdload protect_read (which uses MMU to detect reads) in the same area detects reads. At least I have a workaround.
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Old 04 May 2022, 19:36   #4
Toni Wilen
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Fixed. Memwatch regions that crossed 64k "bank" (or were larger than 64k) didn't map last bank if it was only partially required.

(This can be seen easily by using "dm" to see which parts of memory map is remapped to debug [D] banks)
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Old 04 May 2022, 19:52   #5
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thanks!
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