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Previously, RISC-V FS support was unable to support O3CPU. It was due to two issues: 1. CLINT was calling tc->setMiscRegNoEffect which triggers a conditionalSquash on O3CPU. These frequent squashes led to assertion error in src/cpu/o3/inst_queue_impl.hh line 1293 (we still suspect that the assertion might contain some assumptions). 2. A CSR write to SATP needs to trigger a squash (since MMU can be activated). This is done by conditionally adding the IsSquashAfter flag to CSR operations if the target is SATP. This is a simple fix. (Else, an auipc right after a CSR write to SATP might compute the wrong value). In the future, a better implementation should only set the flag for writes to the relevant bit(s). Change-Id: Ieb9fd0b9aa09e4d2f270b28c2297ea821a81bf65 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/43244 Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu> Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Ayaz Akram <yazakram@ucdavis.edu> Reviewed-by: Peter Yuen <petery.hin@huawei.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.