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When a segfault happens in the guest, report a SEGV trap to GDB (if there is one attached) instead of bailing out immediately. The obvious use-case for this, is the ability to debug guest crashes in GDB in the standard manner. The less-trivial use-case is for development of software in an incomplete software stack (cf. Aarno-Engblom's "Virtual Platforms" pp.105 et seq.) One particular example is Ingalls-Miranda simulation of JIT compilers, where the VM's address space may be split between the simulated and the real machine: in this case, GDB traps facilitate the transparent illusion of an unbroken address space. Change-Id: I9072ed5f6474e05e9a99dc42ae5754be28121355 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/44685 Reviewed-by: Gabe Black <gabe.black@gmail.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Maintainer: Gabe Black <gabe.black@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.