Source code exception location based on pstack
Hi,
I have a core that's caused by an exception. pstack tells me the offending function and also the hex offset inside that function, and I need to get to the exact line in my source file.
The way I used to do that in the past was to generate a .s from the .C using the -S option of CC, but the recent version of CC that I have doesn't show the source line number inside the .s.
Please let me know how can I get to the exact line in the source file from the core / pstack.
Regards,
Sachin
# 1
Even without the help from the compiler you can still figure out which c-statement the
failed instruction maps to, but, as you guessed it, it is little painful (A little bit of
familiarity with assembly will come in handy here) :
In mdb, take the instruction pstack reported, and use '::dis' to get instructions around the
failing one. From the o/p, look for the following sign posts :
- any function calls
- any sethi calls, sparc uses sethi to load any constants
- any jmpl calls (function pointers translate to jmpl calls)
- any loops for/while - these generally will have ba/be/bne to some other location.
With the above info, look out where these figure in the corresponding C-routine.
If the function is really huge, the above can get iterative and more painful.
With regard to the -S option, you may want to ask in compiler/studio forums !!
-surya
