184fefbb3b
We currently don't handle unaligned PCs correctly. There is one check for unaligned PCs in the TLB when running in aarch64 mode, but this check does not cover cases where the CPU does not do a TLB lookup when decoding an instruction (e.g., a branch stays within the same cache line). Additionally, the Decoder class sometimes throws an assertion for unaligned PCs which breaks speculation. This changeset introduces a decoder fault bit field in the ExtMachInst structure. This field can be used to signal a decoder failure. If set, the decoder generates an internal gem5fault instruction instead of a normal instruction. This instruction in turns either panics (fault type PANIC), returns an PCAlignmentFault (fault type UNALIGNED, aarch64) or PrefetchAbort (fault type UNALIGNED, aarch32). The patch causes minor changes to the realview64 regressions, and a stats bump will follow.
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.