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How to set a breakpoint on a newly created thread?

 
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nexnex
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PostPosted: Mon Jun 24, 2019 11:40 am    Post subject: How to set a breakpoint on a newly created thread? Reply with quote
Let's say I'm spawning a thread to run AA script using createThread.
If I set a breakpoint on a line in that script before spawning a thread it won't work.

Code:
createThread(script)
script:
xor eax,eax // set bp, spawn a thread


I've been advised to use following trick to bypass it:
Add infinite loop to a script, spawn a thread, place bp inside the loop.
What allows it to work is the fact that we place bp after spawning a thread.

Code:
script_debug:
mov ecx,#1000
call Sleep
jmp script_debug // place bp here and replace with nop to allow it to exit the loop
jmp script


I wonder if there is other simpler way to do it.
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nexnex
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PostPosted: Tue Jun 25, 2019 11:23 pm    Post subject: Reply with quote
Nobody has similar problem? Or everybody do the same thing?
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Dark Byte
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PostPosted: Wed Jun 26, 2019 12:27 am    Post subject: Reply with quote
Use a software breakpoint
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nexnex
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PostPosted: Wed Jun 26, 2019 2:40 pm    Post subject: Reply with quote
Guess who feels stupid now. Thank you!
I'm still not sure why hardware bp does not work in a new thread.
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Dark Byte
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PostPosted: Wed Jun 26, 2019 2:50 pm    Post subject: Reply with quote
If using VEH debug the setting of the breakpoints happens after the thread has started execution
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