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At Iff9ad68d64e67b3df51682b7e4e272e5f355bcd6 a check was added to prevent segfaults when unserializing the GenericTimer in case the new number of thread contexts was smaller than the old one pre-checkpoint. However, GenericTimer objects are only created dynamically as needed after timer miscreg accesses. Therefore, if we take the checkpoint before touching those registers, e.g. from a simple baremetal example, then the checkpoint saves zero timers, and upon restore the assert would fail because we have one thread context and not zero: > fatal: The simulated system has been initialized with 1 CPUs, but the Generic Timer checkpoint expects 0 CPUs. Consider restoring the checkpoint specifying 0 CPUs. This commit solves that by ensuring only that the new thread context count larger than, but not necessarily equal to the number of cores. Change-Id: I8bcb05a6faecd4b4845f7fd4d71df95041bf6c99 JIRA: https://gem5.atlassian.net/browse/GEM5-703 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/31894 Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.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.