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Instructions that use the coprocessor interface check the current program status to determine whether the current context has the priviledges to read from/write to the coprocessor. Some modes allow the execution of coprocessor instructions, some others do not allow it, while some other modes are unexpected (e.g., executing an AArch32 instruction while being in an AArch64 mode). Previously we would unconditionally trigger a panic if we were in an unexpected mode. This change removes the panic and replaces it with an Undefined Instruction fault that triggers if and when a coprocessor instruction commits in an unexpected mode. This allows speculative coprocessor instructions from unexpected modes to execute but prevents them from gettting committed. Change-Id: If2776d5bae2471cdbaf76d0e1ae655f501bfbf01 Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-by: Rekai Gonzalez Alberquilla <rekai.gonzalezalberquilla@arm.com> Reviewed-on: https://gem5-review.googlesource.com/2281 Maintainer: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-by: Weiping Liao <weipingliao@google.com> |
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| configs | ||
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| src | ||
| system | ||
| tests | ||
| util | ||
| .gitignore | ||
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| CONTRIBUTING.md | ||
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| LICENSE | ||
| README | ||
| SConstruct | ||
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/Introduction, and for more information about building the simulator and getting started please see http://www.gem5.org/Documentation and http://www.gem5.org/Tutorials. 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/Dependencies 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/Build_System for more details and options. With the simulator built, have a look at http://www.gem5.org/Running_gem5 for more information on how to use gem5. 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. Please see the gem5 download page for these items at http://www.gem5.org/Download If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.