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This type is primarily used to determine the size of a pointer when using that ABI, similar to the uintptr_t type, but also less directly to determine the "native" size of the ABI. For instance, for 32 bit ARM ABIs, it should be defined as uint32_t since that's both the size of a uintptr_t, and, less directly, the size of a 32 bit ARM register and "naturally" sized types in that ABI. This type can be used by the VPtr template to retrieve its actual value from a simcall's parameters. In general, when accepting or returning a pointer or address in a simcall, the VPtr template should be used so that it's managed correctly by GuestABI. Addr will be treated as a uint64_t allways which will be incorrect for 32 bit ABIs. Change-Id: I3af046917387541d6faff96a21a1f1dbf7317e06 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/40496 Maintainer: Gabe Black <gabe.black@gmail.com> Tested-by: kokoro <noreply+kokoro@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.