This directory contains a demo of C++ configuration of gem5. The intention
is to provide a mechanism to allow pre-generated config.ini files generated
by Python-based gem5 to be reloaded in library-base versions of gem5
embedded in other systems using C++ calls for simulation control.
This demo implements a few of the simulation control mechanisms of the Python
gem5 on top of a C++ configured system.
Read main.cc for more details of the implementation.
To build:
First build gem5 as a library with cxx-config support and (optionally)
without python. Also build a normal gem5 (cxx-config not needed, Python
needed):
> cd ../..
> scons build/ARM/gem5.opt
> scons --with-cxx-config --without-python build/ARM/libgem5_opt.so
> cd util/cxx_config
Note: For MAC / OSX this command should be used:
> scons --with-cxx-config --without-python build/ARM/libgem5_opt.dylib
Set a proper LD_LIBRARY_PATH e.g. for bash:
> export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/path/to/gem5/build/ARM/"
or for MAC / OSX:
> export DYLD_LIBRARY_PATH="$DYLD_LIBRARY_PATH:/path/to/gem5/build/ARM/"
Then edit Makefile to set the paths for PYTHON and run make
> make
Make a config file for the C++-configured gem5 using normal gem5
> ../../build/ARM/gem5.opt ../../configs/example/se.py -c \
> ../../tests/test-progs/hello/bin/arm/linux/hello
The binary 'gem5.opt.cxx' can now be used to load in the generated config
file from the previous normal gem5 run.
Try:
> ./gem5.opt.cxx m5out/config.ini
This should print:
> Hello world!
The .ini file can also be read by the Python .ini file reader example:
> ../../build/ARM/gem5.opt ../../configs/example/read_config.py m5out/config.ini
5b08ae2372