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When handling a system call, external code would call Process::syscall which would extract the syscall number, that would call the base class' doSyscall method, that would call into the subclass' getDesc to get the appropriate descriptor, and then doSyscall would check that a syscall was found and call into it. Instead, we can just make the SyscallDescTable optionally check for missing syscalls (in case we want to check multiple tables), and make syscall look up the appropriate descriptor and call it. The base implementation of syscall would then do the only bit of doSyscall that is no longer being handled, incrementing the numSyscalls stat. Change-Id: If102c156830ed2997d177dc6937cc85dddadf3f9 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/24119 Tested-by: kokoro <noreply+kokoro@google.com> Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com> Maintainer: Gabe Black <gabeblack@google.com> Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
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.