Windows NT 3.1/4.0 STOP 0x0000007B?

Reply 20 of 24, by superfury

Posted on 2019-06-08, 16:50

superfury Offline

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Just found out something strange booting the Bochs' openBSD floppy disk. It executes a ATAPI reset command, then a ATAPI IDENTIFY, then a ATAPI PACKET command, sends one word, then says "wdc1:0:0: device timeout, c_bcount=0, c_skip=0"?

Edit: It seems to be executing the instruction F2666F, which is a REPNZ OUTSW? But the REPNZ is invalidated, thus not active? What should happen in this case?

Edit: Just changed the REPNZ instruction to actually act as a normal REP for INS and OUTS instructions, instead of invalidating the REPNZ prefix altogether. That should fix that bug.

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Reply 21 of 24, by superfury

Posted on 2019-06-09, 21:25

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Thinking about it, that 8 sectors.... That's exactly 4KB? Perhaps that has something to do with the issue?

Perhaps something to do with paging or something to do with it?

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Reply 22 of 24, by superfury

Posted on 2019-06-10, 11:23

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Hmmm... The final INSW was a word from the 8th hard disk sector(loading sector 0x48 as the next sector, becoming busy for 60000ns('reading the next sector from disk', with an IRQ following that delay to start reading the next sector from the disk controller)). It has 0x37 sectors(started out with 0x3F sectors) left to read from the disk. The next sector is supposed to be read at logical memory location 0x

At that point, I see no more disk access(except the status register), no page fault of any kind.

After that, I see it being busy for some time, then the status register becomes 0x90(when it raises the IRQ)?

It seems like it's resetting the device before the IRQ arrives? That 0x90 is actually Windows NT having reset the device.

Edit: Hmmm.... With earlier sectors, it reads the status register twice, reading 0x58. But the final one(when it resets after that), it reads it for a third time(also finding 0x58)?

Edit: Hmmm... I see the status register reads after a new sector arrives at EIP of 80407004. The REP INSW is at 80407042.

The status register reads are always at 0x80407004, including the strange third status register read after the sector where it resets the ATA controller?

Edit: This is what happens after the second status register being read:

Filename: debugger_Windows_NT31_booting_crashduringfinalsector_aftersecondstatusread.7z
File size: 1.85 MiB
Downloads: 33 downloads
File comment: What happens after the second status register read.
File license: Fair use/fair dealing exception

Anyone?

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Reply 23 of 24, by superfury

Posted on 2019-06-10, 13:16

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Hmmm.... Looking through the log, I don't see the PUSH EBX instruction actually writing memory(immediately after the very first CALL instruction):

10008:80010e1b E8 A0 0A 00 00 calld 800118c0	RealRAM(p):00010e5a=24($); RAM(p):00010e5a=24($); Physical(p):00010e5a=24($); Paged(p):80010e5a=24($); Normal(p):80010e5a=24($); Paged(w):801ac6e0=20( ); Physical(w):001ac6e0=20( ); RAM(w):001ac6e0=20( ); RealRAM(w):0014c6e0=20( ); Paged(w):801ac6e1=0e(); Physical(w):001ac6e1=0e(); RAM(w):001ac6e1=0e(); RealRAM(w):0014c6e1=0e(); Paged(w):801ac6e2=01(); Physical(w):001ac6e2=01(); RAM(w):001ac6e2=01(); RealRAM(w):0014c6e2=01(); Paged(w):801ac6e3=80(?); Physical(w):001ac6e3=80(?); RAM(w):001ac6e3=80(?); RealRAM(w):0014c6e3=80(?)
2Registers:
3EAX: ff8fd590 EBX: ff8ff310 ECX: 00000003 EDX: 0000000e
4ESP: 801ac6e4 EBP: 00000000 ESI: ff8fd648 EDI: ff8fdbd8
5CS: 0008 DS: 0023 ES: 0023 FS: 0030 GS: 0000 SS: 0010 TR: 0028 LDTR: 0000
6EIP: 80010e1b EFLAGS: 00000282
7CR0: e005001f CR1: 00000000 CR2: c1040000 CR3: 00030000
8CR4: 00000000
9DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
10DR6: 00000000 DR7: 00000000
11GDTR: 00008003500003ff IDTR: 00008003540007ff
12FLAGSINFO: 0000000000ipfavr0n00odItSz0a0p1c 
130008:800118c0 53 push ebx	RealRAM(p):000118c0=53(S); RAM(p):000118c0=53(S); Physical(p):000118c0=53(S); Paged(p):800118c0=53(S); Normal(p):800118c0=53(S); RealRAM(p):000118c1=56(V); RAM(p):000118c1=56(V); Physical(p):000118c1=56(V); Paged(p):800118c1=56(V); Normal(p):800118c1=56(V); RealRAM(p):000118c2=57(W); RAM(p):000118c2=57(W); Physical(p):000118c2=57(W); Paged(p):800118c2=57(W); Normal(p):800118c2=57(W); RealRAM(p):000118c3=8b(?); RAM(p):000118c3=8b(?); Physical(p):000118c3=8b(?); Paged(p):800118c3=8b(?); Normal(p):800118c3=8b(?); RealRAM(p):000118c4=44(D); RAM(p):000118c4=44(D); Physical(p):000118c4=44(D); Paged(p):800118c4=44(D); Normal(p):800118c4=44(D); RealRAM(p):000118c5=24($); RAM(p):000118c5=24($); Physical(p):000118c5=24($); Paged(p):800118c5=24($); Normal(p):800118c5=24($); RealRAM(p):000118c6=10(); RAM(p):000118c6=10(); Physical(p):000118c6=10(); Paged(p):800118c6=10(); Normal(p):800118c6=10(); RealRAM(p):000118c7=2a(*); RAM(p):000118c7=2a(*); Physical(p):000118c7=2a(*); Paged(p):800118c7=2a(*); Normal(p):800118c7=2a(*); RealRAM(p):000118c8=c9(?); RAM(p):000118c8=c9(?); Physical(p):000118c8=c9(?); Paged(p):800118c8=c9(?); Normal(p):800118c8=c9(?); RealRAM(p):000118c9=8b(?); RAM(p):000118c9=8b(?); Physical(p):000118c9=8b(?); Paged(p):800118c9=8b(?); Normal(p):800118c9=8b(?); RealRAM(p):000118ca=70(p); RAM(p):000118ca=70(p); Physical(p):000118ca=70(p); Paged(p):800118ca=70(p); Normal(p):800118ca=70(p); RealRAM(p):000118cb=28((); RAM(p):000118cb=28((); Physical(p):000118cb=28((); Paged(p):800118cb=28((); Normal(p):800118cb=28((); RealRAM(p):000118cc=8a(?); RAM(p):000118cc=8a(?); Physical(p):000118cc=8a(?); Paged(p):800118cc=8a(?); Normal(p):800118cc=8a(?); RealRAM(p):000118cd=5c(\); RAM(p):000118cd=5c(\); Physical(p):000118cd=5c(\); Paged(p):800118cd=5c(\); Normal(p):800118cd=5c(\); RealRAM(p):000118ce=24($); RAM(p):000118ce=24($); Physical(p):000118ce=24($); Paged(p):800118ce=24($); Normal(p):800118ce=24($); RealRAM(p):000118cf=2c(,); RAM(p):000118cf=2c(,); Physical(p):000118cf=2c(,); Paged(p):800118cf=2c(,); Normal(p):800118cf=2c(,); RealRAM(p):000118d0=80(?); RAM(p):000118d0=80(?); Physical(p):000118d0=80(?); Paged(p):800118d0=80(?); Normal(p):800118d0=80(?); RealRAM(p):000118d1=fb(?); RAM(p):000118d1=fb(?); Physical(p):000118d1=fb(?); Paged(p):800118d1=fb(?); Normal(p):800118d1=fb(?); RealRAM(p):000118d2=02(); RAM(p):000118d2=02(); Physical(p):000118d2=02(); Paged(p):800118d2=02(); Normal(p):800118d2=02(); RealRAM(p):000118d3=75(u); RAM(p):000118d3=75(u); Physical(p):000118d3=75(u); Paged(p):800118d3=75(u); Normal(p):800118d3=75(u); RealRAM(p):000118d4=02(); RAM(p):000118d4=02(); Physical(p):000118d4=02(); Paged(p):800118d4=02(); Normal(p):800118d4=02(); RealRAM(p):000118d5=b1(?); RAM(p):000118d5=b1(?); Physical(p):000118d5=b1(?); Paged(p):800118d5=b1(?); Normal(p):800118d5=b1(?); RealRAM(p):000118d6=10(); RAM(p):000118d6=10(); Physical(p):000118d6=10(); Paged(p):800118d6=10(); Normal(p):800118d6=10(); RealRAM(p):000118d7=80(?); RAM(p):000118d7=80(?); Physical(p):000118d7=80(?); Paged(p):800118d7=80(?); Normal(p):800118d7=80(?); RealRAM(p):000118d8=c1(?); RAM(p):000118d8=c1(?); Physical(p):000118d8=c1(?); Paged(p):800118d8=c1(?); Normal(p):800118d8=c1(?); RealRAM(p):000118d9=30(0); RAM(p):000118d9=30(0); Physical(p):000118d9=30(0); Paged(p):800118d9=30(0); Normal(p):800118d9=30(0); RealRAM(p):000118da=51(Q); RAM(p):000118da=51(Q); Physical(p):000118da=51(Q); Paged(p):800118da=51(Q); Normal(p):800118da=51(Q); RealRAM(p):000118db=50(P); RAM(p):000118db=50(P); Physical(p):000118db=50(P); Paged(p):800118db=50(P); Normal(p):800118db=50(P); RealRAM(p):000118dc=e8(?); RAM(p):000118dc=e8(?); Physical(p):000118dc=e8(?); Paged(p):800118dc=e8(?); Normal(p):800118dc=e8(?); RealRAM(p):000118dd=2f(/); RAM(p):000118dd=2f(/); Physical(p):000118dd=2f(/); Paged(p):800118dd=2f(/); Normal(p):800118dd=2f(/); RealRAM(p):000118de=0c(); RAM(p):000118de=0c(); Physical(p):000118de=0c(); Paged(p):800118de=0c(); Normal(p):800118de=0c(); RealRAM(p):000118df=00( ); RAM(p):000118df=00( ); Physical(p):000118df=00( ); Paged(p):800118df=00( ); Normal(p):800118df=00( ); RealRAM(p):000118e0=00( ); RAM(p):000118e0=00( ); Physical(p):000118e0=00( ); Paged(p):800118e0=00( ); Normal(p):800118e0=00( ); RealRAM(p):000118e1=8b(?); RAM(p):000118e1=8b(?); Physical(p):000118e1=8b(?); Paged(p):800118e1=8b(?); Normal(p):800118e1=8b(?); RealRAM(p):000118e2=c8(?); RAM(p):000118e2=c8(?); Physical(p):000118e2=c8(?); Paged(p):800118e2=c8(?); Normal(p):800118e2=c8(?); RealRAM(p):000118e3=0b(); RAM(p):000118e3=0b(); Physical(p):000118e3=0b(); Paged(p):800118e3=0b(); Normal(p):800118e3=0b(); RealRAM(p):000118e4=c9(?); RAM(p):000118e4=c9(?); Physical(p):000118e4=c9(?); Paged(p):800118e4=c9(?); Normal(p):800118e4=c9(?); RealRAM(p):000118e5=0f(); RAM(p):000118e5=0f(); Physical(p):000118e5=0f(); Paged(p):800118e5=0f(); Normal(p):800118e5=0f(); RealRAM(p):000118e6=84(?); RAM(p):000118e6=84(?); Physical(p):000118e6=84(?); Paged(p):800118e6=84(?); Normal(p):800118e6=84(?); RealRAM(p):000118e7=03(); RAM(p):000118e7=03(); Physical(p):000118e7=03(); Paged(p):800118e7=03(); Normal(p):800118e7=03(); RealRAM(p):000118e8=01(); RAM(p):000118e8=01(); Physical(p):000118e8=01(); Paged(p):800118e8=01(); Normal(p):800118e8=01(); RealRAM(p):000118e9=00( ); RAM(p):000118e9=00( ); Physical(p):000118e9=00( ); Paged(p):800118e9=00( ); Normal(p):800118e9=00( ); RealRAM(p):000118ea=00( ); RAM(p):000118ea=00( ); Physical(p):000118ea=00( ); Paged(p):800118ea=00( ); Normal(p):800118ea=00( ); RealRAM(p):000118eb=8b(?); RAM(p):000118eb=8b(?); Physical(p):000118eb=8b(?); Paged(p):800118eb=8b(?); Normal(p):800118eb=8b(?); RealRAM(p):000118ec=44(D); RAM(p):000118ec=44(D); Physical(p):000118ec=44(D); Paged(p):800118ec=44(D); Normal(p):800118ec=44(D); RealRAM(p):000118ed=24($); RAM(p):000118ed=24($); Physical(p):000118ed=24($); Paged(p):800118ed=24($); Normal(p):800118ed=24($); RealRAM(p):000118ee=28((); RAM(p):000118ee=28((); Physical(p):000118ee=28((); Paged(p):800118ee=28((); Normal(p):800118ee=28((); RealRAM(p):000118ef=89(?); RAM(p):000118ef=89(?); Physical(p):000118ef=89(?); Paged(p):800118ef=89(?); Normal(p):800118ef=89(?); RealRAM(p):000118f0=41(A); RAM(p):000118f0=41(A); Physical(p):000118f0=41(A); Paged(p):800118f0=41(A); Normal(p):800118f0=41(A); RealRAM(p):000118f1=0c(); RAM(p):000118f1=0c(); Physical(p):000118f1=0c(); Paged(p):800118f1=0c(); Normal(p):800118f1=0c(); RealRAM(p):000118f2=8b(?); RAM(p):000118f2=8b(?); Physical(p):000118f2=8b(?); Paged(p):800118f2=8b(?); Normal(p):800118f2=8b(?); RealRAM(p):000118f3=44(D); RAM(p):000118f3=44(D); Physical(p):000118f3=44(D); Paged(p):800118f3=44(D); Normal(p):800118f3=44(D); RealRAM(p):000118f4=24($); RAM(p):000118f4=24($); Physical(p):000118f4=24($); Paged(p):800118f4=24($); Normal(p):800118f4=24($); RealRAM(p):000118f5=14(); RAM(p):000118f5=14(); Physical(p):000118f5=14(); Paged(p):800118f5=14(); Normal(p):800118f5=14(); RealRAM(p):000118f6=89(?); RAM(p):000118f6=89(?); Physical(p):000118f6=89(?); Paged(p):800118f6=89(?); Normal(p):800118f6=89(?); RealRAM(p):000118f7=41(A); RAM(p):000118f7=41(A); Physical(p):000118f7=41(A); Paged(p):800118f7=41(A); Normal(p):800118f7=41(A); RealRAM(p):000118f8=18(); RAM(p):000118f8=18(); Physical(p):000118f8=18(); Paged(p):800118f8=18(); Normal(p):800118f8=18(); RealRAM(p):000118f9=8a(?); RAM(p):000118f9=8a(?); Physical(p):000118f9=8a(?); Paged(p):800118f9=8a(?); Normal(p):800118f9=8a(?); RealRAM(p):000118fa=44(D); RAM(p):000118fa=44(D); Physical(p):000118fa=44(D); Paged(p):800118fa=44(D); Normal(p):800118fa=44(D); RealRAM(p):000118fb=24($); RAM(p):000118fb=24($); Physical(p):000118fb=24($); Paged(p):800118fb=24($); Normal(p):800118fb=24($); RealRAM(p):000118fc=18(); RAM(p):000118fc=18(); Physical(p):000118fc=18(); Paged(p):800118fc=18(); Normal(p):800118fc=18(); RealRAM(p):000118fd=88(?); RAM(p):000118fd=88(?); Physical(p):000118fd=88(?); Paged(p):800118fd=88(?); Normal(p):800118fd=88(?); RealRAM(p):000118fe=01(); RAM(p):000118fe=01(); Physical(p):000118fe=01(); Paged(p):800118fe=01(); Normal(p):800118fe=01(); RealRAM(p):000118ff=80(?); RAM(p):000118ff
14Registers:
15EAX: ff8fd590 EBX: ff8ff310 ECX: 00000003 EDX: 0000000e
16ESP: 801ac6e0 EBP: 00000000 ESI: ff8fd648 EDI: ff8fdbd8
17CS: 0008 DS: 0023 ES: 0023 FS: 0030 GS: 0000 SS: 0010 TR: 0028 LDTR: 0000
18EIP: 800118c0 EFLAGS: 00000282
19CR0: e005001f CR1: 00000000 CR2: c1040000 CR3: 00030000
20CR4: 00000000
21DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
22DR6: 00000000 DR7: 00000000
23GDTR: 00008003500003ff IDTR: 00008003540007ff
24FLAGSINFO: 0000000000ipfavr0n00odItSz0a0p1c 
250008:800118c1 56 push esi	RealRAM(p):00011900=fb(?); RAM(p):00011900=fb(?); Physical(p):00011900=fb(?); Paged(p):80011900=fb(?); Normal(p):80011900=fb(?); Paged(w):801ac6d8=48(H); Physical(w):001ac6d8=48(H); RAM(w):001ac6d8=48(H); RealRAM(w):0014c6d8=48(H); Paged(w):801ac6d9=d6(?); Physical(w):001ac6d9=d6(?); RAM(w):001ac6d9=d6(?); RealRAM(w):0014c6d9=d6(?); Paged(w):801ac6da=8f(?); Physical(w):001ac6da=8f(?); RAM(w):001ac6da=8f(?); RealRAM(w):0014c6da=8f(?); Paged(w):801ac6db=ff(?); Physical(w):001ac6db=ff(?); RAM(w):001ac6db=ff(?); RealRAM(w):0014c6db=ff(?)
26Registers:
27EAX: ff8fd590 EBX: ff8ff310 ECX: 00000003 EDX: 0000000e
28ESP: 801ac6dc EBP: 00000000 ESI: ff8fd648 EDI: ff8fdbd8
29CS: 0008 DS: 0023 ES: 0023 FS: 0030 GS: 0000 SS: 0010 TR: 0028 LDTR: 0000
30EIP: 800118c1 EFLAGS: 00000282
31CR0: e005001f CR1: 00000000 CR2: c1040000 CR3: 00030000
32CR4: 00000000
33DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
34DR6: 00000000 DR7: 00000000
35GDTR: 00008003500003ff IDTR: 00008003540007ff
36FLAGSINFO: 0000000000ipfavr0n00odItSz0a0p1c 
370008:800118c2 57 push edi	RealRAM(p):00011901=02(); RAM(p):00011901=02(); Physical(p):00011901=02(); Paged(p):80011901=02(); Normal(p):80011901=02(); Paged(w):801ac6d4=d8(?); Physical(w):001ac6d4=d8(?); RAM(w):001ac6d4=d8(?); RealRAM(w):0014c6d4=d8(?); Paged(w):801ac6d5=db(?); Physical(w):001ac6d5=db(?); RAM(w):001ac6d5=db(?); RealRAM(w):0014c6d5=db(?); Paged(w):801ac6d6=8f(?); Physical(w):001ac6d6=8f(?); RAM(w):001ac6d6=8f(?); RealRAM(w):0014c6d6=8f(?); Paged(w):801ac6d7=ff(?); Physical(w):001ac6d7=ff(?); RAM(w):001ac6d7=ff(?); RealRAM(w):0014c6d7=ff(?)
38Registers:
39EAX: ff8fd590 EBX: ff8ff310 ECX: 00000003 EDX: 0000000e
40ESP: 801ac6d8 EBP: 00000000 ESI: ff8fd648 EDI: ff8fdbd8
41CS: 0008 DS: 0023 ES: 0023 FS: 0030 GS: 0000 SS: 0010 TR: 0028 LDTR: 0000
42EIP: 800118c2 EFLAGS: 00000282
43CR0: e005001f CR1: 00000000 CR2: c1040000 CR3: 00030000
44CR4: 00000000
45DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
46DR6: 00000000 DR7: 00000000
47GDTR: 00008003500003ff IDTR: 00008003540007ff
48FLAGSINFO: 0000000000ipfavr0n00odItSz0a0p1c 
490008:800118c3 8B 44 24 10 mov eax,dword ss:[esp+10]	RealRAM(p):00011902=8a(?); RAM(p):00011902=8a(?); Physical(p):00011902=8a(?); Paged(p):80011902=8a(?); Normal(p):80011902=8a(?); RealRAM(r):0014c6e4=90(?); RAM(r):001ac6e4=90(?); Physical(r):001ac6e4=90(?); Paged(r):801ac6e4=90(?); RealRAM(r):0014c6e5=d5(?); RAM(r):001ac6e5=d5(?); Physical(r):001ac6e5=d5(?); Paged(r):801ac6e5=d5(?); RealRAM(r):0014c6e6=8f(?); RAM(r):001ac6e6=8f(?); Physical(r):001ac6e6=8f(?); Paged(r):801ac6e6=8f(?); RealRAM(r):0014c6e7=ff(?); RAM(r):001ac6e7=ff(?); Physical(r):001ac6e7=ff(?); Paged(r):801ac6e7=ff(?)
50Registers:
51EAX: ff8fd590 EBX: ff8ff310 ECX: 00000003 EDX: 0000000e
52ESP: 801ac6d4 EBP: 00000000 ESI: ff8fd648 EDI: ff8fdbd8
53CS: 0008 DS: 0023 ES: 0023 FS: 0030 GS: 0000 SS: 0010 TR: 0028 LDTR: 0000
54EIP: 800118c3 EFLAGS: 00000282
55CR0: e005001f CR1: 00000000 CR2: c1040000 CR3: 00030000
56CR4: 00000000
57DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
58DR6: 00000000 DR7: 00000000
59GDTR: 00008003500003ff IDTR: 00008003540007ff
60FLAGSINFO: 0000000000ipfavr0n00odItSz0a0p1c

…Show last 13 lines

610008:800118c7 2A C9 sub cl,cl	RealRAM(p):00011903=44(D); RAM(p):00011903=44(D); Physical(p):00011903=44(D); Paged(p):80011903=44(D); Normal(p):80011903=44(D); RealRAM(p):00011904=24($); RAM(p):00011904=24($); Physical(p):00011904=24($); Paged(p):80011904=24($); Normal(p):80011904=24($); RealRAM(p):00011905=1c(); RAM(p):00011905=1c(); Physical(p):00011905=1c(); Paged(p):80011905=1c(); Normal(p):80011905=1c(); RealRAM(p):00011906=88(?); RAM(p):00011906=88(?); Physical(p):00011906=88(?); Paged(p):80011906=88(?); Normal(p):80011906=88(?)
62Registers:
63EAX: ff8fd590 EBX: ff8ff310 ECX: 00000003 EDX: 0000000e
64ESP: 801ac6d4 EBP: 00000000 ESI: ff8fd648 EDI: ff8fdbd8
65CS: 0008 DS: 0023 ES: 0023 FS: 0030 GS: 0000 SS: 0010 TR: 0028 LDTR: 0000
66EIP: 800118c7 EFLAGS: 00000282
67CR0: e005001f CR1: 00000000 CR2: c1040000 CR3: 00030000
68CR4: 00000000
69DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
70DR6: 00000000 DR7: 00000000
71GDTR: 00008003500003ff IDTR: 00008003540007ff
72FLAGSINFO: 0000000000ipfavr0n00odItSz0a0p1c

However, inspecting the instruction PUSH EBX itself, it seems that it DOES write correctly to memory, it just isn't logged somehow?

Author of the UniPCemu emulator.
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UniPCemu for Android, Windows, PSP, Vita and Switch on itch.io

Reply 24 of 24, by superfury

Posted on 2019-06-10, 16:36

superfury Offline

Rank l33t++

Rank: l33t++
Posts: 5466
Joined: 2014-03-08, 11:25
Location: Netherlands

Just tried NT4's setup again. I notice that the same issue happens there, but it's booting from a floppy disk, not a hard disk? It gives a STOP 0x0000007B (0xFF85CED0, 0x00000000, 0x00000000, 0x00000000)?

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UniPCemu Git repository
UniPCemu for Android, Windows, PSP, Vita and Switch on itch.io

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