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There were three things preventing execve from working Firstly, the entrypoint for the new program wasn't correct. This was fixed by calling Process::init, which adds a bias to the entrypoint. Secondly, the uname string wasn't being copied over. This meant when the new executable tried to run, it would think the kernel was too old to run on, and would error out. This was fixed by copying over the uname string (the `release` string in Process) when creating the new process. Additionally, this patch also ensures we copy over the uname string in the clone implementation, as otherwise a cloned thread that called execve would crash. Finally, we choose to not delete the new ProcessParams or the old Process. This is done both because it matches what is done in cloneFunc, but also because deleting the old process results in a segfault later on. Change-Id: I4ca201da689e9e37671b4cb477dc76fa12eecf69 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/48345 Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com> Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu> Maintainer: Matt Sinclair <mattdsinclair@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>
This is the gem5 simulator. The main website can be found at http://www.gem5.org A good starting point is http://www.gem5.org/about, and for more information about building the simulator and getting started please see http://www.gem5.org/documentation and http://www.gem5.org/documentation/learning_gem5/introduction. To build gem5, you will need the following software: g++ or clang, Python (gem5 links in the Python interpreter), SCons, SWIG, zlib, m4, and lastly protobuf if you want trace capture and playback support. Please see http://www.gem5.org/documentation/general_docs/building for more details concerning the minimum versions of the aforementioned tools. Once you have all dependencies resolved, type 'scons build/<ARCH>/gem5.opt' where ARCH is one of ARM, NULL, MIPS, POWER, SPARC, or X86. This will build an optimized version of the gem5 binary (gem5.opt) for the the specified architecture. See http://www.gem5.org/documentation/general_docs/building for more details and options. The basic source release includes these subdirectories: - configs: example simulation configuration scripts - ext: less-common external packages needed to build gem5 - src: source code of the gem5 simulator - system: source for some optional system software for simulated systems - tests: regression tests - util: useful utility programs and files To run full-system simulations, you will need compiled system firmware (console and PALcode for Alpha), kernel binaries and one or more disk images. If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.