[Crash-utility] [RFC]: Feature to display local arguments and variables

Hi We have implemented this piece of code to provide, crash tool, capability to display local variables and arguments. We would kindly request you to provide your feedback and guidance on this code so that we can take it further How to Build/Requirements 1. Enable compiling extends option in main Makefile 2. create a symbolic link to netdump.h under extensions/ 3. This feature makes use of libelf and libdw libraries provided by elfutils package. 4, This feature is implemented as an extend, local.so library needs to be loaded once crash prompt is available Features 1. Currently it has feature to display arguments/locals of top most stack frame. ex usage: local params or local locals 2. Currently code can analyze only ppc64 dumps 3. It displays the current address of the local variables ( and some times direct values when the variables are stored in register and not in stack frame) 4. In case of code optimization, variable information is not available at that time printing "Failed to fetch information" (This is in accordance with gdb out put) TBD 1. Stack unwinding code is still need to be implemented 2. Support for x86 dumps is still not provided 3. Context switching via -r command still needs to implemented Note: We were planning to display the variable values instead of addresses as we are doing currently, but it adds up to additional challenges in terms of typecasting the variables, in case it is array or structure, so for the time being we are printing only address and expect user to dump contents using rd command. Suggestions here will be very helpful. Attaching the code...but the Code is not extensively tested please let us know your thoughts Thanks Sharyathi Nagesh