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This change introduces the concept of a faux-filesystem. The faux-filesystem creates a directory structure in m5out (or whatever output dir the user specifies) where system calls may be redirected. This is useful to avoid non-determinism when reading files with varying path names (e.g., variations from run-to-run if the simulation is scheduled on a cluster where paths may change). Also, this changeset allows circumventing host pseudofiles which have information specific to the host processor (such as cache hierarchy or processor information). Bypassing host pseudofiles can be useful when executing runtimes in the absence of an operating system kernel since runtimes may try to query standard files (i.e. /proc or /sys) which are not relevant to an application executing in syscall emulation mode. Change-Id: I90821b3b403168b904a662fa98b85def1628621c Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/12119 Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Maintainer: Jason Lowe-Power <jason@lowepower.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/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.