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Update in a pmp addr register can have effect on other pmp rules, for example if TOR mode is used. According to specs, update in a pmp entry is made using an update to a pmpaddr reg, followed by an update to pmpcfg reg which should be followed by sfence.vma. Currently, in gem5 update in cfg register (combination of 8 pmpcfg regs.), which should happen after a pmpaddr reg. update, leads to an update in all pmp rules. However, there seems to be a case where we receive an interrupt right before execution of an instruction to update cfg register, which leads to unindented side-effects of S mode addresses falsely falling into a wrong pmp region. Updating pmp rules right after pmpaddr update, might be redundant, but should not break anything otherwise. Change-Id: I3776ee6ba40e1249c98d11076a2d176de40a957e Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/47059 Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Maintainer: Jason Lowe-Power <power.jg@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.