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 Post subject: Re: When your OS goes crazy - Screenshots
PostPosted: Mon Mar 30, 2020 11:04 pm 
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This is mine while I try to figure out why I'm getting a page fault when reading a memory mapped io device.


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 Post subject: Re: When your OS goes crazy - Screenshots
PostPosted: Mon Apr 06, 2020 1:59 am 
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Location: Vladivostok, Russia
This happened when i tried to load a .COM without properly setting segments


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 Post subject: Re: When your OS goes crazy - Screenshots
PostPosted: Tue Apr 21, 2020 4:26 am 
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Image decoder faults are a bit cliché, but since I've finally gotten around to working on a PNG decoder here's a WIP screenshot where things went a bit wrong:

Image

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 Post subject: Re: When your OS goes crazy - Screenshots
PostPosted: Fri Apr 24, 2020 9:33 am 
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SuperLeaf1995 wrote:
This happened when i tried to load a .COM without properly setting segments

Reminds me of a friend's real-mode assembly-language unix. A program could be loaded wrong depending on its size, of all things. He suspected a bug in the FAT12 driver, but it was already an abandoned project by that point. It was only written to settle an argument, and my friend was too inexperienced to code assembler well.


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 Post subject: Re: When your OS goes crazy - Screenshots
PostPosted: Sat May 02, 2020 7:47 am 
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Image
Most kernel in this topic


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 Post subject: Re: When your OS goes crazy - Screenshots
PostPosted: Sat May 02, 2020 10:30 am 
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I'm a little concerned about Bart's state of mind... :lol:


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 Post subject: Re: When your OS goes crazy - Screenshots
PostPosted: Fri Jul 17, 2020 2:06 am 
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Image
This isn't what is supposed to happen on loading a DOOM save

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 Post subject: Re: When your OS goes crazy - Screenshots
PostPosted: Sat Jul 18, 2020 10:22 am 
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A classic


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Fast as a galloping horse: HaoudOS


Last edited by Haoud on Fri Jul 31, 2020 1:25 pm, edited 1 time in total.
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 Post subject: Re: When your OS goes crazy - Screenshots
PostPosted: Thu Jul 23, 2020 8:57 am 
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I've upgraded my build environment to the latest, and strange things started to appear...

With gcc, it doesn't matter if I compile for AArch64 or x86_64, with or without optimizations. Everything works (at this point all processes must block waiting for messages).
With CLang, everything works as expected for AArch64, but for x86_64 I get the following error. The interesting thing is, I don't even tried to mount root file system yet (FS task should just block too). Also, the backtrace looks pretty funky: "seterr" just sets a thread-local variable, it calls no function at all, definitely not "pipe_read", and there's no way that "mq_recv" called "main" either...
Attachment:
ubbug.png
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Okay, there's no other solution, it's time for a through debug!

Cheers,
bzt


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 Post subject: Re: When your OS goes crazy - Screenshots
PostPosted: Fri Jul 24, 2020 3:20 pm 
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This is a neat looking kernel debugger


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 Post subject: Re: When your OS goes crazy - Screenshots
PostPosted: Sun Jul 26, 2020 9:12 am 
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bzt wrote:
Okay, there's no other solution, it's time for a through debug!


Quite an epic debugger you got there mate. Is it worth coding? Is it better than plain old Bochs?


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 Post subject: Re: When your OS goes crazy - Screenshots
PostPosted: Sun Jul 26, 2020 10:20 am 
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@Monax, @jlxip: thanks!

jlxip wrote:
Quite an epic debugger you got there mate. Is it worth coding? Is it better than plain old Bochs?
Well, I needed a debugger that I can run on real hardware using only minicom on the other side. I was thinking about implementing gdb-server, but that protocol is just too dumb for what I need. So for me it wasn't a question of worth it, but it was a necessity, a must have.

Otherwise writing a debugger is not a big deal. Here's a minimal one, only ca. 300 SLoC. It is for AArch64, but the code would be pretty much the same for x86 (except for the disassembler). This one is MIT licensed.

The code for the debugger you see on the screenshot is here. It's more complex, the common part being more than 1000 SLoC. The architecture specific parts are in their corresponding directories (supports x86_64 and AArch64). This is not a free software, licensed under CC-by-nc-sa.

As for the disassembler, it's available as a separate project, udisasm (for AArch64, I haven't migrated the x86 disassembler to this new format yet, but I'm going to. Any help would be appreciated :-) ). The udisasm is licensed interestingly, the instruction tables and the generator script is licensed under GPL (so it's free, but copyleft), while the generated C headers are MIT licensed (so you can include the generated disassembler code in any project, even in proprietary ones).

Cheers,
bzt


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 Post subject: Re: When your OS goes crazy - Screenshots
PostPosted: Wed Jul 29, 2020 11:35 am 
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So what should have been my page table ended up in the screen buffer.
If that's even what happen.

But given the repeating graphic pattern in the top of the screen, and that the setup of the page table is pretty much all that's happens in this test,
my guess is that my page table ended up in the screen buffer. #-o


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Screenshot at 2020-07-28 20-47-33.png
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 Post subject: Re: When your OS goes crazy - Screenshots
PostPosted: Sat Aug 08, 2020 9:41 am 
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My all new panic screen:
Image

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 Post subject: Re: When your OS goes crazy - Screenshots
PostPosted: Sat Sep 12, 2020 10:14 pm 
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Joined: Tue Jul 14, 2020 4:01 am
Posts: 20
Just testing NetDOS/32's page fault handler


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