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Because the fast models (or at least the one we've looked at) give access to the integer registers mostly based on the current view of those registers, it does its own flattening and prevents accessing most of the raw storage locations without this extra level of mapping. To store to the flattened locations, we need to unflatten the indexes and in one case shift the mode so that we get the right values. Some registers which have irrelevant values for fast model (the "PC" which is actually diverted elsewhere, the zero register, microcode registers, and the "dummy" register), and those are left out of the mapping so that they return 0 and blow up gem5 when someone attempts to set them. Change-Id: Ia2d315d5ca4c8a65b17ad52beff3a366ca8b3d46 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/23791 Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Chun-Chen TK Hsu <chunchenhsu@google.com> Maintainer: Gabe Black <gabeblack@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 ALPHA, 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.