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Various changes to support rv32: 1. Add riscv_bits field into RiscvISA to switch rv_type 2. Add rv_type field into ExtMachInst 3. Split various constants into rv32/rv64 version 4. Fix mcause/mstatus/misa setting per rv_type 5. Split RiscvCPU into rv32/rv64 6. Fix how reset/branch create new pc so rv_type is preserved 7. Tag gdb-xml only for rv64 TODO: Add rv32 gdb-xml Add rv32 implementation into decoder Currently there're three places where we store the rv_type information (1) ISA (2) PCState (3) ExtMachInst. In theory, the ISA should be the source of truth, and propagates information into PCState, then Inst. However, there is an API on RiscvProcess that let users modify the rv_type in PCState, so there's a chance to get inconsistent rv_type. We should either modify the structure so such kind of usage is well supported, or just prohibit people from setting a different rv_type. Change-Id: If5685ae60f8d18f4f2e18137e235989e63156404 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/63091 Reviewed-by: Yu-hsin Wang <yuhsingw@google.com> 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, 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 these tools. Once you have all dependencies resolved, type 'scons build/<CONFIG>/gem5.opt' where CONFIG is one of the options in build_opts like ARM, NULL, MIPS, POWER, SPARC, X86, Garnet_standalone, etc. This will build an optimized version of the gem5 binary (gem5.opt) with the the specified configuration. See http://www.gem5.org/documentation/general_docs/building for more details and options. The main source tree includes these subdirectories: - build_opts: pre-made default configurations for gem5 - build_tools: tools used internally by gem5's build process. - configs: example simulation configuration scripts - ext: less-common external packages needed to build gem5 - include: include files for use in other programs - site_scons: modular components of the build system - 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 may need compiled system firmware, kernel binaries and one or more disk images, depending on gem5's configuration and what type of workload you're trying to run. Many of those resources can be downloaded from http://resources.gem5.org, and/or from the git repository here: https://gem5.googlesource.com/public/gem5-resources/ If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.