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> Main > why does this line crashes? |
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Teehee 08 Oct 2011, 17:05
Code: cmp byte[esi-1],0 _________________ Sorry if bad english. |
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08 Oct 2011, 17:05 |
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ouadji 08 Oct 2011, 18:35
esi ? a page fault ? _________________ I am not young enough to know everything (Oscar Wilde)-  |
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08 Oct 2011, 18:35 |
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typedef 08 Oct 2011, 19:29
check direction flag maybe
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08 Oct 2011, 19:29 |
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Teehee 08 Oct 2011, 19:33
> esi ? a page fault ?
could be!? 
> check direction flag maybe both crash: Code: cld mov byte[esi-1],0 std mov byte[esi-1],0 |
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08 Oct 2011, 19:33 |
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ouadji 08 Oct 2011, 20:48
Code: ;@Teehee cld mov byte[esi-1],0 std mov byte[esi-1],0 but in this case it is not the direction flag that is causing the problem, but it is also a page fault. Only a page fault can trigger a crash with this code. (or a power outage  )
A breakpoint just before, a good debugger ... (3 min) 100% agree with Goplat edit: cld and std does not affect cmp or mov _________________ I am not young enough to know everything (Oscar Wilde)- |
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08 Oct 2011, 20:48 |
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typedef 09 Oct 2011, 02:29
ouadji wrote:
Which power outage are we talking about here  lol |
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09 Oct 2011, 02:29 |
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Teehee 09 Oct 2011, 12:28
Goplat wrote: If the "cmp byte[esi-1],0" instruction crashes it can only be because ESI-1 is not a valid address. Without seeing more of your code there's no way for anyone to know why that would be. I just made a new file with just that instruction.
Quote: cld and std does not affect cmp or mov LOL i forgot that haha _________________ Sorry if bad english. |
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09 Oct 2011, 12:28 |
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