dr_insert_clean_call output

[Mohammad Ewais]

Hello,

Is there a way to have any output from functions called by dr_insert_clean_call? Either as:

1. a return value (so, call a non void returning function)

2. If the function expects arguments by reference, do any changes to these arguments get reflected in the opnds passed by dr_insert_clean_call?

If neither of these are possible:

I am forcing apps to use my own memory, for every memory access I use drutil_insert_get_mem_addr then pass it as an argument to my translation function called by dr_insert_clean_call. What I want is to use the result of that function to replace the original memory operand. Any suggestions?

[Mohammad Ewais]

Another possibly relevant question is the following:

Does the type of opnd_t passed to dr_insert_clean_call matter? 

For example, if the final argument type is int32_t, does it matter if the operand passed is a reg or an immediate? As long as it contains a valid 32 bit value?

[John Galea]

Hey,

If you want to maintain results computed via clean calls, have your tool set up and use thread local storage (drmgr_register_tls_field) or heap memory via a global variable. Having clean calls return values is not really appropriate as by design they save and restore machine states.

Cheers,

John

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