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Forum Topic - Detecting unaligned access during runtime:

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Sesh

05/24/2019 6:51 PM

post119713

Detecting unaligned access during runtime

We are using QNX 6.6 with ARMv7 cores. Does QNX have any options to detect unaligned memory access at runtime? With 
linux this can be achieved by
echo 3 > /proc/cpu/alignment to warn and fixup errors.

Albrecht Uhlmann

06/07/2019 4:13 AM

post119741

Re: Detecting unaligned access during runtime

I think that a thread doing unaligned access creates a fault at processor level that gets translated to a signal (SIGBUS
 I think, but not sure). You can catch that in your application, but not from outside.

To make this wark, you have to disable "alignment fault emulation" in the kernel, its a command line option to procnto. 
(-ad or something)

-Al

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