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2016-03-08syscall_emul: Fix erroneous use of deleteAndreas Hansson
clang correctly points out an erroneous use of delete.
2015-06-17sim: Add voltage() function to clocked_objectDavid Guillen Fandos
Adding voltage function which returns the current voltage for a given clocked object. It's handy for power models and similar stuff that need to retrieve voltage. Function frequency() is already there, so I see no reason for not having this one too.
2015-11-26sim: Add support for notifying Drainable objects of a forkAndreas Sandberg
When forking a gem5 process, some objects need to clean up resources (mainly file descriptions) shared between the child and the parent of the fork. This changeset adds the notifyFork() method to Drainable, which is called in the child process. Signed-off-by: Andreas Sandberg <andreas@sandberg.pp.se> [sascha.bischoff@arm.com: Rebased patches onto a newer gem5 version] Signed-off-by: Sascha Bischoff <sascha.bischoff@arm.com> Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
2015-11-27base: Add support for changing output directoriesAndreas Sandberg
This changeset adds support for changing the simulator output directory. This can be useful when the simulation goes through several stages (e.g., a warming phase, a simulation phase, and a verification phase) since it allows the output from each stage to be located in a different directory. Relocation is done by calling core.setOutputDir() from Python or simout.setOutputDirectory() from C++. This change affects several parts of the design of the gem5's output subsystem. First, files returned by an OutputDirectory instance (e.g., simout) are of the type OutputStream instead of a std::ostream. This allows us to do some more book keeping and control re-opening of files when the output directory is changed. Second, new subdirectories are OutputDirectory instances, which should be used to create files in that sub-directory. Signed-off-by: Andreas Sandberg <andreas@sandberg.pp.se> [sascha.bischoff@arm.com: Rebased patches onto a newer gem5 version] Signed-off-by: Sascha Bischoff <sascha.bischoff@arm.com> Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
2016-02-13syscall_emul: Implement clock_getres() system callMichael LeBeane
This patch implements the clock_getres() system call for arm and x86 in linux SE mode.
2016-02-06style: fix missing spaces in control statementsSteve Reinhardt
Result of running 'hg m5style --skip-all --fix-control -a'.
2016-02-06style: remove trailing whitespaceSteve Reinhardt
Result of running 'hg m5style --skip-all --fix-white -a'.
2016-01-17sim: don't ignore SIG_TRAPSteve Reinhardt
By ignoring SIG_TRAP, using --debug-break <N> when not connected to a debugger becomes a no-op. Apparently this was intended to be a feature, though the rationale is not clear. If we don't ignore SIG_TRAP, then using --debug-break <N> when not connected to a debugger causes the simulation process to terminate at tick N. This is occasionally useful, e.g., if you just want to collect a trace for a specific window of execution then you can combine this with --debug-start to do exactly that. In addition to not ignoring the signal, this patch also updates the --debug-break help message and deletes a handful of unprotected calls to Debug::breakpoint() that relied on the prior behavior.
2016-01-11scons: Enable -Wextra by defaultAndreas Hansson
Make best use of the compiler, and enable -Wextra as well as -Wall. There are a few issues that had to be resolved, but they are all trivial.
2016-01-07dev: Distributed Ethernet link for distributed gem5 simulationsGabor Dozsa
Distributed gem5 (abbreviated dist-gem5) is the result of the convergence effort between multi-gem5 and pd-gem5 (from Univ. of Wisconsin). It relies on the base multi-gem5 infrastructure for packet forwarding, synchronisation and checkpointing but combines those with the elaborated network switch model from pd-gem5. --HG-- rename : src/dev/net/multi_etherlink.cc => src/dev/net/dist_etherlink.cc rename : src/dev/net/multi_etherlink.hh => src/dev/net/dist_etherlink.hh rename : src/dev/net/multi_iface.cc => src/dev/net/dist_iface.cc rename : src/dev/net/multi_iface.hh => src/dev/net/dist_iface.hh rename : src/dev/net/multi_packet.hh => src/dev/net/dist_packet.hh
2016-01-07pseudo inst,util: Add optional key to initparam pseudo instructionGabor Dozsa
The key parameter can be used to read out various config parameters from within the simulated software.
2015-12-18sim: Use the old work item behavior by defaultAndreas Sandberg
When adding an option to forward work items to the Python environment, the new behavior was accidentally enabled by default. Set the value of exit_on_work_items to False by default to revert to the old behavior unless the simulation scripts explicitly requests work item forwarding.
2015-12-14sim: Add an option to forward work items to PythonAndreas Sandberg
There are cases where we want the Python world to handle work items instead of the C++ world. However, that's currently not possible. This changeset adds the forward_work_items option to the System class. Then it is set to True, work items will generate workbegin/workend simulation exists with the work item ID as the exit code and the old C++ handling is completely bypassed. --HG-- extra : rebase_source : 8de637a744fc4b6ff2bc763f00cdf8ddf2bff885
2015-11-05sim: Disable gzip compression for writefile pseudo instructionSascha Bischoff
The writefile pseudo instruction uses OutputDirectory::create and OutputDirectory::openFile to create the output files. However, by default these will check the file extention for .gz, and create a gzip compressed stream if the file ending matches. When writing out files, we want to write them out exactly as they are in the guest simulation, and never want to compress them with gzio. Additionally, this causes m5 writefile to fail when checking the error flags for the output steam. With this patch we add an additional no_gz argument to OutputDirectory::create and OutputDirectory::openFile which allows us to override the gzip compression. Therefore, for m5 writefile we disable the filename check, and always create a standard ostream.
2015-12-09syscall_emul: don't check host fd when allocating target fdSteve Reinhardt
There's a well-meaning check in Process::allocFD() to return an invalid target fd (-1) if the incoming host fd is -1. However, this means that emulated drivers, which want to allocate a target fd that doesn't correspond to a host fd, can't use -1 to indicate an intentionally invalid host fd. It turns out the allocFD() check is redundant, as callers always test the host fd for validity before calling. Also, callers never test the return value of allocFD() for validity, so even if the test failed, it would likely have the undesirable result of returning -1 to the target app as a file descriptor without setting errno. Thus the check is pointless and is now getting in the way, so it seems we should just get rid of it.
2015-12-04sim: Get rid of the non-const serialize() methodAndreas Sandberg
The last SimObject using the legacy serialize API with non-const methods has now been transitioned to the new API. This changeset removes the serializeOld() methods from the serialization base class as they are no longer used.
2015-12-04sim: Add support for generating back traces on errorsAndreas Sandberg
Add functionality to generate a back trace if gem5 crashes (SIGABRT or SIGSEGV). The current implementation uses glibc's stack traversal support if available and stubs out the call to print_backtrace() otherwise.
2015-10-12misc: Add explicit overrides and fix other clang >= 3.5 issuesAndreas Hansson
This patch adds explicit overrides as this is now required when using "-Wall" with clang >= 3.5, the latter now part of the most recent XCode. The patch consequently removes "virtual" for those methods where "override" is added. The latter should be enough of an indication. As part of this patch, a few minor issues that clang >= 3.5 complains about are also resolved (unused methods and variables).
2015-10-12misc: Remove redundant compiler-specific definesAndreas Hansson
This patch moves away from using M5_ATTR_OVERRIDE and the m5::hashmap (and similar) abstractions, as these are no longer needed with gcc 4.7 and clang 3.1 as minimum compiler versions.
2015-10-09sim: Add relative break schedulingDylan Johnson
Add schedRelBreak() function, executable within a debugger, that sets a breakpoint by relative rather than absolute tick.
2015-09-02sim: Add ability to break at specific kernel functionDylan Johnson
Adds a GDB callable function that sets a breakpoint at the beginning of a kernel function.
2015-09-30cpu: Change thread assignments for heterogenous SMTMitch Hayenga
Trying to run an SE system with varying threads per core (SMT cores + Non-SMT cores) caused failures due to the CPU id assignment logic. The comment about thread assignment (worrying about core 0 not having tid 0) seems not to be valid given that our configuration scripts initialize them in order. This removes that constraint so a heterogenously threaded sytem can work.
2015-09-29syscall_emul: Bandage readlink /proc/self/exeJoel Hestness
The recent changeset to readlink() to handle reading the /proc/self/exe link introduces a number of problems. This patch fixes two: 1) Because readlink() called on /proc/self/exe now uses LiveProcess::progName() to find the binary path, it will only get the zeroth parameter of the simulated system command line. However, if a config script also specifies the process' executable, the executable parameter is used to create the LiveProcess rather than the zeroth command line parameter. Thus, the zeroth command line parameter is not necessarily the correct path to the binary executing in the simulated system. To fix this, add a LiveProcess data member, 'executable', which is correctly set during instantiation and returned from progName(). 2) If a config script allows a user to pass a relative path as the zeroth simulated system command line parameter or process executable, readlink() will incorrecly return a relative path when called on '/proc/self/exe'. /proc/self/exe is always set to a full path, so running benchmarks can fail if a relative path is returned. To fix this, clean up the handling of LiveProcess::progName() within readlink() to get the full binary path. NOTE: This patch still leaves the potential problem that host full path to the binary bleeds into the simulated system, potentially causing the appearance of non-deterministic simulated system execution.
2015-09-25mem: Add PacketInfo to be used for packet probe pointsAndreas Hansson
This patch fixes a use-after-delete issue in the packet probe points by adding a PacketInfo struct to retain the key fields before passing the packet onwards. We want to probe the packet after it is successfully sent, but by that time the fields may be modified, and the packet may even be deleted. Amazingly enough the issue has gone undetected for months, and only recently popped up in our regressions.
2015-09-04sim: Fix time unit in abort messageAndreas Hansson
2015-09-02sim: tag-based checkpoint versioningCurtis Dunham
This commit addresses gem5 checkpoints' linear versioning bottleneck. Since development is distributed across many private trees, there exists a sort of 'race' for checkpoint version numbers: internally a checkpoint version may be used but then resynchronizing with the external tree causes a conflict on that version. This change replaces the linear version number with a set of unique strings called tags. Now the only conflicts that can arise are of tag names, where collisions are much easier to avoid. The checkpoint upgrader (util/cpt_upgrader.py) upgrades the version representation, as one would expect. Each tag version implements its upgrader code in a python file in the util/cpt_upgraders directory rather than adding a function to the upgrader script itself. The version tags are stored in the 'Globals' section rather than 'root' (as the version was previously) because 'Globals' gets unserialized first and can provide a warning before any other unserialization errors can occur.
2015-09-02sim: support checkpointing std::set<std::string>'sCurtis Dunham
This is in support of tag-based checkpoint versioning; the version tags are stored in string sets. This commit adds such support.
2015-09-02sim: make warning for absent optional parameters optionalCurtis Dunham
This is in support of tag-based checkpoint versioning. It should be possible to examine an optional parameter in a checkpoint during unserialization and not have it throw a warning.
2015-09-01sim: Remove broken AutoSerialize support from the event queueAndreas Sandberg
Event auto-serialization no longer in use and has been broken ever since the introduction of PDES support almost two years ago. Additionally, serializing the individual event queues is undesirable since it exposes the thread structure of the simulator. What this means in practice is that the number of threads in the simulator must be the same when taking a checkpoint and when loading the checkpoint. This changeset removes support for the AutoSerialize event flag and the associated serialization code.
2015-09-01sim: Remove autoserialize support for exit eventsAndreas Sandberg
This changeset removes the support for the autoserialize parameter in GlobalSimLoopExitEvent (including exitSimLoop()) and LocalSimLoopExitEvent. Auto-serialization of the LocalSimLoopExitEvent was never used, so this is not expected to affect anything. However, it was sometimes used for GlobalSimLoopExitEvent. Unfortunately, serialization of global events has never been supported, so checkpoints with such events will currently cause simulation panics. The serialize parameter to exitSimLoop() has been left in-place to maintain API compatibility (removing it would affect m5ops). Instead of just dropping it, we now print a warning if the parameter is set and the exit event is scheduled in the future (i.e., not at the current tick).
2015-09-01sim: Remove unused SerializeBuilder interfaceAndreas Sandberg
2015-09-01sim: Replace fromInt/fromSimObject with decltypeAndreas Sandberg
2015-09-01sim: Move SimObject resolver to sim_object.hhAndreas Sandberg
The object resolver isn't serialization specific and shouldn't live in serialize.hh. Move it to sim_object.hh since it queries to the SimObject hierarchy.
2015-08-26cpu: quiesce pseudoinsts: Always do full quiesceEmilio Castillo
The O3CPU blocks the Fetch when it sees a quiesce instruction (IsQuiesce flag). When the inst. is executed, a quiesce event is created to reactivate the context and unblock the Fetch. If the quiesceNs or quiesceCycles are called with a value of 0, the QuiesceEvent will not be created and the Fetch stage will remain blocked. Committed by Joel Hestness <jthestness@gmail.com>
2015-08-11sim: clocked object: function for converting cycles to ticks.Nilay Vaish
2015-08-07sim: Flag EventQueue::getCurTick() as constAndreas Sandberg
2015-08-07sim: Split ClockedObject to make it usable to non-SimObjectsAndreas Sandberg
Split ClockedObject into two classes: Clocked that provides the basic clock functionality, and ClockedObject that inherits from Clocked and SimObject to provide the functionality of the old ClockedObject.
2015-08-07base: Declare a type for context IDsAndreas Sandberg
Context IDs used to be declared as ad hoc (usually as int). This changeset introduces a typedef for ContextIDs and a constant for invalid context IDs.
2015-08-05sim: Fixup comments and constness in draining infrastructureAndreas Sandberg
Fix comments that got outdated by the draining rewrite. Also fixup constness for methods in the querying drain state in the DrainManager.
2015-08-04sim: Initialize Drainable::_drainState to the system's stateAndreas Sandberg
It is sometimes desirable to be able to instantiate Drainable objects when the simulator isn't in the Running state. Currently, we always initialize Drainable objects to the Running state. However, this confuses many of the sanity checks in the base class since objects aren't expected to be in the Running state if the system is in the Draining or Drained state. Instead of always initializing the state variable in Drainable to DrainState::Running, initialize it to the state the DrainManager is in. Note: This means an object can be created in the Draining/Drained state without first calling drain().
2015-08-04mem: Add probe support to the CommMonitorAndreas Sandberg
This changeset adds a standardized probe point type to monitor packets in the memory system and adds two probe points to the CommMonitor class. These probe points enable monitoring of successfully delivered requests and successfully delivered responses. Memory system probe listeners should use the BaseMemProbe base class to provide a unified configuration interface and reuse listener registration code. Unlike the ProbeListenerObject class, the BaseMemProbe allows objects to be wired to multiple ProbeManager instances as long as they use the same probe point name.
2015-08-03sim: function for testing for auto deletionTimothy Jones
Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2015-08-03uby: Fix checkpointing and restoreTimothy Jones
There are 2 problems with the existing checkpoint and restore code in ruby. The first is that when the event queue is altered by ruby during serialization, some events that are currently scheduled cannot be found (e.g. the event to stop simulation that always lives on the queue), causing a panic. The second is that ruby is sometimes serialized after the memory system, meaning that the dirty data in its cache is flushed back to memory too late and so isn't included in the checkpoint. These are fixed by implementing memory writeback in ruby, using the same technique of hijacking the event queue, but first descheduling all events that are currently on it. They are saved, along with their scheduled time, so that the event queue can be faithfully reconstructed after writeback has finished. Events with the AutoDelete flag set will delete themselves when they are descheduled, causing an error when attempting to schedule them again. This is fixed by simply not recording them when taking them off the queue. Writeback is still implemented using flushing, so the cache recorder object, that is created to generate the trace and manage flushing, is kept around and used during serialization to write the trace to disk. Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2015-07-20syscall: Add readlink to x86 with special case /proc/self/exeDavid Hashe
This patch implements the correct behavior.
2015-07-28revert 5af8f40d8f2cNilay Vaish
2015-07-26cpu: implements vector registersNilay Vaish
This adds a vector register type. The type is defined as a std::array of a fixed number of uint64_ts. The isa_parser.py has been modified to parse vector register operands and generate the required code. Different cpus have vector register files now.
2015-07-24style: change Process function calls to use camelCaseBrandon Potter
The Process class methods were using an improper style and this subsequently bled into the system call code. The following regular expressions should be helpful if someone transitions private system call patches on top of these changesets: s/alloc_fd/allocFD/ s/sim_fd(/simFD(/ s/sim_fd_obj/getFDEntry/ s/fix_file_offsets/fixFileOffsets/ s/find_file_offsets/findFileOffsets/
2015-07-24syscall_emul: standardized file descriptor name and add return checks.Brandon Potter
The patch clarifies whether file descriptors are host file descriptors or target file descriptors in the system call code. (Host file descriptors are file descriptors which have been allocated through real system calls where target file descriptors are allocated from an array in the Process class.)
2015-07-24base: refactor process class (specifically FdMap and friends)Brandon Potter
This patch extends the previous patch's alterations around fd_map. It cleans up some of the uglier code in the process file and replaces it with a more concise C++11 version. As part of the changes, the FdMap class is pulled out of the Process class and receives its own file.
2015-07-24syscall_emul: file descriptor interface changesBrandon Potter
This patch gets rid of unused Process::dup_fd method and does minor refactoring in the process class files. The file descriptor max has been changed to be the number of file descriptors since this clarifies the loop boundary condition and cleans up the code a bit. The fd_map field has been altered to be dynamically allocated as opposed to being an array; the intention here is to build on this is subsequent patches to allow processes to share their file descriptors with the clone system call.