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2014-10-20misc: Use gmtime for conversion to UTC to avoid getenv/setenvAndreas Hansson
This patch changes how we turn time into UTC. Previously we manipulated the TZ environment variable, but this has issues as the strings that are manipulated could be tainted (see e.g. CERT ENV34-C). Now we simply rely on the built-in gmtime function and avoid touching getenv/setenv all together.
2014-10-20base: Fix for stats node on gcc < 4.6.3Andreas Hansson
This patch adds an explicit function to get the underlying node as gcc 4.6.1 and 4.6.2 have issues otherwise.
2014-10-16misc: Move AddrRangeList from port.hh to addr_range.hhAndreas Hansson
The new location seems like a better fit. The iterator typedefs are removed in favour of using C++11 auto.
2014-10-16sim: EventQueue wakeup on events scheduled outside the event loopAndreas Hansson
This patch adds a 'wakeup' member function to EventQueue which should be called on an event queue whenever an event is scheduled on the event queue from outside code within the call tree of the gem5 event loop. This clearly isn't necessary for normal gem5 EventQueue operation but becomes the minimum necessary interface to allow hosting gem5's event loop onto other schedulers where there may be calls into gem5 from external code which schedules events onto an EventQueue between the current time and the time of the next scheduled event. The use case I have in mind is a SystemC hosting where the event loop is: while (more events) { wait(time_to_next_event or wakeup) setCurTick service events at this time } where the 'wait' needs to be woken up if time_to_next_event becomes shorter due to a scheduled event from SystemC arriving in a gem5 object. Requiring 'wakeup' to be called is a more efficient interface than requiring all gem5 event scheduling actions to affect the host scheduler. This interface could be located elsewhere, say on another global object, or by being passed by the host scheduler to objects which will schedule such events, but it seems cleanest to put it on EventQueue as it is actually a signal to the queue. EventQueue::wakeup is called for async_event events on event queue 0 as it's only important that *some* queue be triggered for such events.
2014-10-16base: Reimplement the DPRINTF mechanism in a Logger classAndrew Bardsley
This patch adds a Logger class encapsulating dprintf. This allows variants of DPRINTF logging to be constructed and substituted in place of the default behaviour. The Logger provides a logMessage(when, name, format, ...) member function like Trace::dprintf and a getOstream member function to use a raw ostream for logging. A class OstreamLogger is provided which generates the customary debugging output with Trace::OstreamLogger::logMessage being the old Trace::dprintf.
2014-10-16arch: Use shared_ptr for all FaultsAndreas Hansson
This patch takes quite a large step in transitioning from the ad-hoc RefCountingPtr to the c++11 shared_ptr by adopting its use for all Faults. There are no changes in behaviour, and the code modifications are mostly just replacing "new" with "make_shared".
2014-10-16base: Use shared_ptr for stat NodeAndreas Hansson
This patch transitions the stat Node and its derived classes from the ad-hoc RefCountingPtr to the c++11 shared_ptr. There are no changes in behaviour, and the code modifications are mainly replacing "new" with "make_shared".
2014-10-16base: Transition CP annotate to use shared_ptrAndreas Hansson
2014-10-16dev: Use shared_ptr for EthPacketDataAndreas Hansson
This patch transitions the EthPacketData from the ad-hoc RefCountingPtr to the c++11 shared_ptr. There are no changes in behaviour, and the code modifications are mainly replacing "new" with "make_shared". The bool casting operator for the shared_ptr is explicit, and we must therefore either cast it, compare it to NULL (p != nullptr), double negate it (!!p) or do a (p ? true : false).
2014-10-16config: Add a --without-python option to build processAndrew Bardsley
Add the ability to build libgem5 without embedded Python or the ability to configure with Python. This is a prelude to a patch to allow config.ini files to be loaded into libgem5 using only C++ which would make embedding gem5 within other simulation systems easier. This adds a few registration interfaces to things which cross between Python and C++. Namely: stats dumping and SimObject resolving
2014-10-11base: addr range: slight change to validity checkNilay Vaish
The validity check is being changed from < to <= since the end of the range is considered to be a part of it.
2014-10-11base: misc: Add missing header file.Nilay Vaish
2014-10-01misc: Fix issues identified by static analysisAndreas Hansson
Another bunch of issues addressed.
2014-09-27misc: Fix a bunch of minor issues identified by static analysisAndreas Hansson
Add some missing initialisation, and fix a handful benign resource leaks (including some false positives).
2014-04-24misc: Add functions for doing popcount and power-of-two checkingStephan Diestelhorst
Adds two public domain algorithms for determining number of set bits and also whether a value is a power of two, uses the builtin that is available in GCC and clang for popcount.
2014-09-20base: Clean up redundant string functions and use C++11Andreas Hansson
This patch does a bit of housekeeping on the string helper functions and relies on the C++11 standard library where possible. It also does away with our custom string hash as an implementation is already part of the standard library.
2014-09-20base: Add getSectionNames to IniFileAndrew Bardsley
Add an accessor to IniFile to list all the sections in the file.
2014-09-19base: Ensure the CP annotation compiles againAndreas Hansson
A bit of revamping to get the CP annotate functionality to compile.
2014-09-19misc: Restore ostream flags where neededAndreas Hansson
This patch ensures we adhere to the normal ostream usage rules, and restore the flags after modifying them.
2014-09-19stats: Fix flow-control bug in Vector2D printingAndreas Hansson
2014-09-19misc: Remove assertions ensuring unsigned values >= 0Andreas Hansson
2014-09-09misc: Fix a number of unitialised variables and membersAndreas Hansson
Static analysis unearther a bunch of uninitialised variables and members, and this patch addresses the problem. In all cases these omissions seem benign in the end, but at least fixing them means less false positives next time round.
2014-09-03base: Use STL C++11 random number generationAndreas Hansson
This patch changes the random number generator from the in-house Mersenne twister to an implementation relying entirely on C++11 STL. The format for the checkpointing of the twister is simplified. As the functionality was never used this should not matter. Note that this patch does not actually make use of the checkpointing functionality. As the random number generator is not thread safe, it may be sensible to create one generator per thread, system, or even object. Until this is decided the status quo is maintained in that no generator state is part of the checkpoint.
2014-08-26base: Add const to intmath and be more flexible with typingAndreas Hansson
This patch ensures the functions can be used on const variables.
2014-08-26base: Replace the internal varargs stuff with C++11 constructsAndreas Sandberg
We currently use our own home-baked support for type-safe variadic functions. This is confusing and somewhat limited (e.g., cprintf only supports a limited number of arguments). This changeset converts all uses of our internal varargs support to use C++11 variadic macros.
2014-08-26base: Add compiler macros for C++11 final/overrideAndreas Sandberg
Add the macros M5_ATTR_FINAL and M5_ATTR_OVERRIDE which are defined to final and override respectively if supported by the compiler. This is done to allow a smooth transition to gcc >= 4.7.
2014-08-26base: Add a static assert to check bit union rangesAndreas Sandberg
If a bit field in a bit union specified as Bitfield<LSB, MSB> instead of Bitfield<MSB, LSB> the code silently fails and the field is read as zero. This changeset introduces a static assert that tests, at compile time, that the bit order is correct.
2014-08-13base: Remove unused M5_PRAGMA_NORETURNAndreas Sandberg
The M5_PRAGMA_NORETURN macro was only used in for __exit_message. Since the macro only holds a stub definition and all functions with noreturn semantics use the M5_ATTR_NORETURN, this macros is completely redundant.
2014-08-13cpu: Don't forward declare RefCountingPtrAndreas Sandberg
RefCountingPtr is sometimes forward declared to avoid having to include refcnt.hh. This does not work since we typically return instances of RefCountingPtr rather than references to instances. The only reason this currently works is that we include refcnt.hh in cprintf.hh, which "leaks" the header to most other source files. This changeset replaces such forward declarations with an include of refcnt.hh.
2014-08-10base: Remove unused filesAndreas Hansson
A bit of pruning
2014-07-23cpu: `Minor' in-order CPU modelAndrew Bardsley
This patch contains a new CPU model named `Minor'. Minor models a four stage in-order execution pipeline (fetch lines, decompose into macroops, decompose macroops into microops, execute). The model was developed to support the ARM ISA but should be fixable to support all the remaining gem5 ISAs. It currently also works for Alpha, and regressions are included for ARM and Alpha (including Linux boot). Documentation for the model can be found in src/doc/inside-minor.doxygen and its internal operations can be visualised using the Minorview tool utils/minorview.py. Minor was designed to be fairly simple and not to engage in a lot of instruction annotation. As such, it currently has very few gathered stats and may lack other gem5 features. Minor is faster than the o3 model. Sample results: Benchmark | Stat host_seconds (s) ---------------+--------v--------v-------- (on ARM, opt) | simple | o3 | minor | timing | timing | timing ---------------+--------+--------+-------- 10.linux-boot | 169 | 1883 | 1075 10.mcf | 117 | 967 | 491 20.parser | 668 | 6315 | 3146 30.eon | 542 | 3413 | 2414 40.perlbmk | 2339 | 20905 | 11532 50.vortex | 122 | 1094 | 588 60.bzip2 | 2045 | 18061 | 9662 70.twolf | 207 | 2736 | 1036
2014-07-09base: fix operator== for comparing EthAddr objectsAnthony Gutierrez
this operator uses memcmp() to detect if two EthAddr object have the same address, however memcmp() will return 0 if all bytes are equal. operator== returns the return value of memcmp() to indicate whether or not two address are equal. this is incorrect as it will always give the opposite of the intended behavior. this patch fixes that problem.
2014-07-02base: fix some bugs in EthAddrAnthony Gutierrez
per the IEEE 802 spec: 1) fixed broadcast() to ensure that all bytes are equal to 0xff. 2) fixed unicast() to ensure that bit 0 of the first byte is equal to 0 3) fixed multicast() to ensure that bit 0 of the first byte is equal to 1, and that it is not a broadcast. also the constructors in EthAddr are fixed so that all bytes of data are initialized.
2014-05-31style: eliminate equality tests with true and falseSteve Reinhardt
Using '== true' in a boolean expression is totally redundant, and using '== false' is pretty verbose (and arguably less readable in most cases) compared to '!'. It's somewhat of a pet peeve, perhaps, but I had some time waiting for some tests to run and decided to clean these up. Unfortunately, SLICC appears not to have the '!' operator, so I had to leave the '== false' tests in the SLICC code.
2014-05-09stats: Method stats sourceStephan Diestelhorst
This source for stats binds an object and a method / function from the object to a stats object. This allows pulling out stats from object methods without needing to go through a global, or static shim. Syntax is somewhat unpleasant, but the templates and method pointer type specification were quite tricky. Interface is very clean though; and similar to .functor
2014-04-23base: explicitly suggest potential use of 'All' debug flagsCurtis Dunham
Without this declaration, new clangs will complain about this value being unused. It has no explicit use in the codebase, but it can be useful to turn on all debugging flags while in a debugger to greatly increase simulator verbosity.
2014-04-09dev: Protect PollEvent processing when running in parallel modeAndreas Sandberg
The calling thread is undefined when the PollQueue services events. This implies that PollEvents need to handle the case where they are processed from a different thread than the thread that created the event. This changeset adds temporary event queue migrations to the VNC server, the ethernet tap device, and the terminal to protect them from inter-thread calls.
2014-03-23base: Fix error message time unit (cycle -> tick)Andreas Hansson
This patch fixes the unit used in all error messages.
2014-03-07misc: Add panic_if / fatal_if / chatty_assertStephan Diestelhorst
This snippet can be used to replace if + {panics, fatals, asserts} constructs. The idea is to have both the condition checking and a verbose printout in a single statement. The interface is as follows: panic_if(foo != bar, "These should be equal: foo %i bar %i", foo, bar); fatal_if(foo != bar, "These should be equal: foo %i bar %i", foo, bar); chatty_assert(foo == bar, "These should be equal: foo %i bar %i", foo, bar);
2014-03-07scons: Fixes uninitialized warnings issued by clangMitch Hayenga
Small fixes to appease recent clang versions.
2014-02-06base: calls abort() from fatalNilay Vaish
Currently fatal() ends the simulation in a normal fashion. This results in the call stack getting lost when using a debugger and it is not always possible to debug the simulation just from the information provided by the printed error message. Even though the error is likely due to a user's fault, the information available should not be thrown away. Hence, this patch to call abort() from fatal().
2014-01-28base: Fix race condition in the socket listen functionMitch Hayenga
gem5 makes the incorrect assumption that by binding a socket, it effectively has allocated a port. Linux only allocates ports once you call listen on the given socket, not when you call bind. So even if the port was free when bind was called, another process (gem5 instance) could race in between the bind & listen calls and steal the port. In the current code, if the call to bind fails due to the port being in use (EADDRINUSE), gem5 retries for a different port. However if listen fails, gem5 just panics. The fix is testing the return value of listen and re-trying if it was due to EADDRINUSE. Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2014-01-24arm: Add support for ARMv8 (AArch64 & AArch32)ARM gem5 Developers
Note: AArch64 and AArch32 interworking is not supported. If you use an AArch64 kernel you are restricted to AArch64 user-mode binaries. This will be addressed in a later patch. Note: Virtualization is only supported in AArch32 mode. This will also be fixed in a later patch. Contributors: Giacomo Gabrielli (TrustZone, LPAE, system-level AArch64, AArch64 NEON, validation) Thomas Grocutt (AArch32 Virtualization, AArch64 FP, validation) Mbou Eyole (AArch64 NEON, validation) Ali Saidi (AArch64 Linux support, code integration, validation) Edmund Grimley-Evans (AArch64 FP) William Wang (AArch64 Linux support) Rene De Jong (AArch64 Linux support, performance opt.) Matt Horsnell (AArch64 MP, validation) Matt Evans (device models, code integration, validation) Chris Adeniyi-Jones (AArch64 syscall-emulation) Prakash Ramrakhyani (validation) Dam Sunwoo (validation) Chander Sudanthi (validation) Stephan Diestelhorst (validation) Andreas Hansson (code integration, performance opt.) Eric Van Hensbergen (performance opt.) Gabe Black
2014-01-10stats: add function for adding two histogramsNilay Vaish
This patch adds a function to the HistStor class for adding two histograms. This functionality is required for Ruby. It also adds support for printing histograms in a single line.
2013-11-29base: Fix race in PollQueue and remove SIGALRM workaroundAndreas Sandberg
There is a race between enabling asynchronous IO for a file descriptor and IO events happening on that descriptor. A SIGIO won't normally be delivered if an event is pending when asynchronous IO is enabled. Instead, the signal will be raised the next time there is an event on the FD. This changeset simulates a SIGIO by setting the async_io flag when setting up asynchronous IO for an FD. This causes the main event loop to poll all file descriptors to check for pending IO. As a consequence of this, the old SIGALRM hack should no longer be needed and is therefore removed.
2013-11-29base: Clean up signal handlingAndreas Sandberg
The PollEvent class dynamically installs a SIGIO and SIGALRM handler when a file handler is registered. Most signal handlers currently get registered in the initSignals() function. This changeset moves the SIGIO/SIGALRM handlers to initSignals() to live with the other signal handlers. The original code installs SIGIO and SIGALRM with the SA_RESTART option to prevent syscalls from returning EINTR. This changeset consistently uses this flag for all signal handlers to ensure that other signals that trigger asynchronous behavior (e.g., statistics dumping) do not cause undesirable EINTR returns.
2013-11-25sim: simulate with multiple threads and event queuesSteve Reinhardt ext:(%2C%20Nilay%20Vaish%20%3Cnilay%40cs.wisc.edu%3E%2C%20Ali%20Saidi%20%3CAli.Saidi%40ARM.com%3E)
This patch adds support for simulating with multiple threads, each of which operates on an event queue. Each sim object specifies which eventq is would like to be on. A custom barrier implementation is being added using which eventqs synchronize. The patch was tested in two different configurations: 1. ruby_network_test.py: in this simulation L1 cache controllers receive requests from the cpu. The requests are replied to immediately without any communication taking place with any other level. 2. twosys-tsunami-simple-atomic: this configuration simulates a client-server system which are connected by an ethernet link. We still lack the ability to communicate using message buffers or ports. But other things like simulation start and end, synchronizing after every quantum are working. Committed by: Nilay Vaish
2013-10-31base: Add support for ipv6 into inet.hh/inet.ccGeoffrey Blake
2013-10-07base: Fix a potential race in PollQueue::setupAsyncIOAndreas Sandberg
There is a potential race between enabling asynchronous IO and selecting the target for the SIGIO signal. This changeset move the F_SETOWN call to before the F_SETFL call that enables SIGIO delivery. This ensures that signals are always sent to the correct process.
2013-09-09stats: add operator= for DataWrapVec classNilay Vaish
gcc/g++ 4.4.7 complained about the operator= being undefined. This changeset adds the operator.