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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.
2015-11-06misc: Appease clang static analyzerAndreas Hansson
A few minor fixes to issues identified by the clang static analyzer.
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.
2015-09-30base: remove Trace::enabled flagCurtis Dunham
The DTRACE() macro tests both Trace::enabled and the specific flag. This change uses the same administrative interface for enabling/disabling tracing, but masks the SimpleFlags settings directly. This eliminates a load for every DTRACE() test, e.g. DPRINTF.
2015-08-07base: Rewrite the CircleBuf to fix bugs and add serializationAndreas Sandberg
The CircleBuf class has at least one bug causing it to overwrite the wrong elements when wrapping. The current code has a lot of unused functionality and duplicated code. This changeset replaces the old implementation with a new version that supports serialization and arbitrary types in the buffer (not just char).
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.
2015-08-07base: Use constexpr in CyclesAndreas Sandberg
Declare the constructor and all of the operators that don't change the state of a Cycles instance as constexpr. This makes it possible to use Cycles as a static constant and allows the compiler to evaulate simple expressions at compile time. An unfortunate side-effect of this is that we cannot use assertions since C++11 doesn't support them in constexpr functions. As a workaround, we throw an invalid_argument exception when the assert would have triggered. A nice side-effect of this is that the compiler will evaluate the "assertion" at compile time when an expression involving Cycles can be statically evaluated.
2015-07-07base: Add serialization support to Pixels and FrameBufferAndreas Sandberg
Serialize pixels as unsigned 32 bit integers by adding the required to_number() and stream operators. This is used by the FrameBuffer, which now implements the Serializable interface. Users of frame buffers are expected to serialize it into its own section by calling serializeSection().
2015-07-07sim: Refactor the serialization base classAndreas Sandberg
Objects that are can be serialized are supposed to inherit from the Serializable class. This class is meant to provide a unified API for such objects. However, so far it has mainly been used by SimObjects due to some fundamental design limitations. This changeset redesigns to the serialization interface to make it more generic and hide the underlying checkpoint storage. Specifically: * Add a set of APIs to serialize into a subsection of the current object. Previously, objects that needed this functionality would use ad-hoc solutions using nameOut() and section name generation. In the new world, an object that implements the interface has the methods serializeSection() and unserializeSection() that serialize into a named /subsection/ of the current object. Calling serialize() serializes an object into the current section. * Move the name() method from Serializable to SimObject as it is no longer needed for serialization. The fully qualified section name is generated by the main serialization code on the fly as objects serialize sub-objects. * Add a scoped ScopedCheckpointSection helper class. Some objects need to serialize data structures, that are not deriving from Serializable, into subsections. Previously, this was done using nameOut() and manual section name generation. To simplify this, this changeset introduces a ScopedCheckpointSection() helper class. When this class is instantiated, it adds a new /subsection/ and subsequent serialization calls during the lifetime of this helper class happen inside this section (or a subsection in case of nested sections). * The serialize() call is now const which prevents accidental state manipulation during serialization. Objects that rely on modifying state can use the serializeOld() call instead. The default implementation simply calls serialize(). Note: The old-style calls need to be explicitly called using the serializeOld()/serializeSectionOld() style APIs. These are used by default when serializing SimObjects. * Both the input and output checkpoints now use their own named types. This hides underlying checkpoint implementation from objects that need checkpointing and makes it easier to change the underlying checkpoint storage code.
2015-07-03base: remove fd from object loadersCurtis Dunham
All the object loaders directly examine the (already completely loaded by object_file.cc) memory image. There is no current motivation to keep the fd around.
2015-06-21base: Add a warn_if macroAndreas Sandberg
Add a warn if macro that is analogous to the panic_if and fatal_if.
2015-06-09base: Reset CircleBuf size on flush()Andreas Sandberg
The flush() method in CircleBuf resets the state of the circular buffer, but fails to set size to zero. This obviously confuses code that tries to determine the amount of data in the buffer. Set the size to zero on flush.
2015-05-26base: Allow multiple interleaved rangesAndreas Hansson
This patch changes how the address range calculates intersection such that a system can have a number of non-overlapping interleaved ranges without complaining. Without this patch we end up with a panic.
2015-05-23base: Redesign internal frame buffer handlingAndreas Sandberg
Currently, frame buffer handling in gem5 is quite ad hoc. In practice, we pass around naked pointers to raw pixel data and expect consumers to convert frame buffers using the (broken) VideoConverter. This changeset completely redesigns the way we handle frame buffers internally. In summary, it fixes several color conversion bugs, adds support for more color formats (e.g., big endian), and makes the code base easier to follow. In the new world, gem5 always represents pixel data using the Pixel struct when pixels need to be passed between different classes (e.g., a display controller and the VNC server). Producers of entire frames (e.g., display controllers) should use the FrameBuffer class to represent a frame. Frame producers are expected to create one instance of the FrameBuffer class in their constructors and register it with its consumers once. Consumers are expected to check the dimensions of the frame buffer when they consume it. Conversion between the external representation and the internal representation is supported for all common "true color" RGB formats of up to 32-bit color depth. The external pixel representation is expected to be between 1 and 4 bytes in either big endian or little endian. Color channels are assumed to be contiguous ranges of bits within each pixel word. The external pixel value is scaled to an 8-bit internal representation using a floating multiplication to map it to the entire 8-bit range.
2015-05-23base: Clean up bitmap generation codeAndreas Sandberg
The bitmap generation code is hard to follow and incorrectly uses the size of an enum member to calculate the size of a pixel. This changeset cleans up the code and adds some documentation.
2015-04-29arch, base, dev, kern, sym: FreeBSD supportRuslan Bukin
This adds support for FreeBSD/aarch64 FS and SE mode (basic set of syscalls only) Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2015-04-22base: add new ChunkGenerator method to identify last chunkBrandon Potter
2015-02-11base: Add compiler macros to add deprecation warningsAndreas Sandberg
Gcc and clang both provide an attribute that can be used to flag a function as deprecated at compile time. This changeset adds a gem5 compiler macro for that compiler feature. The macro can be used to indicate that a legacy API within gem5 has been deprecated and provide a graceful migration to the new API.
2015-02-11base: Do not dereference NULL in CompoundFlag creationAndreas Hansson
This patch fixes the CompoundFlag constructor, ensuring that it does not dereference NULL. Doing so has undefined behaviuor, and both clang and gcc's undefined-behaviour sanitiser was rather unhappy.
2015-02-03base: add an accessor and operators ==,!= to address rangesCurtis Dunham
2015-02-03base: Add XOR-based hashed address interleavingAndreas Hansson
This patch extends the current address interleaving with basic hashing support. Instead of directly comparing a number of address bits with a matching value, it is now possible to use two independent set of address bits XOR'ed together. This avoids issues where strided address patterns are heavily biased to a subset of the interleaved ranges.
2015-01-07base: Fix assigning between identical bitfields.Gabe Black
If two bitfields are of the same type, also implying that they have the same first and last bit positions, the existing implementation would copy the entire bitfield. That includes the __data member which is shared among all the bitfields, effectively overwritting the entire bitunion. This change also adjusts the write only signed bitfield assignment operator to be like the unsigned version, using "using" instead of implementing it again and calling down to the underlying implementation.
2014-12-05misc: Generalize GDB single stepping.Gabe Black
The new single stepping implementation for x86 doesn't rely on any ISA specific properties or functionality. This change pulls out the per ISA implementation of those functions and promotes the X86 implementation to the base class. One drawback of that implementation is that the CPU might stop on an instruction twice if it's affected by both breakpoints and single stepping. While that might be a little surprising, it's harmless and would only happen under somewhat unlikely circumstances.
2014-12-05misc: Add some utility functions for schedule inst commit events.Gabe Black
These can be used to simplify the implementation of single step in derived classes.
2014-12-05misc: Rename the GDB "Event" event class to InputEvent.Gabe Black
The "Event" name is the same as the base event class. That's a bit confusing, and makes it a little awkward to add other event types.
2014-12-05sim: Ensure GDB interrupts the simulation at an instruction boundary.Gabe Black
Use the comInstEventQueue to ensure GDB interrupts the simulation at an instruction boundary and not in the middle of a macroop, memory access, etc.
2014-12-05misc: Make the GDB register cache accessible in various sized chunks.Gabe Black
Not all ISAs have 64 bit sized registers, so it's not always very convenient to access the GDB register cache in 64 bit sized chunks. This change makes it accessible in 8, 16, 32, or 64 bit chunks. The MIPS and ARM implementations were working around that limitation by bundling and unbundling 32 bit values into 64 bit values. That code has been removed.
2014-12-03sim: Make it possible to override the breakpoint length check.Gabe Black
The check which makes sure the length of the breakpoint being written is the same as a MachInst is only correct on fixed instruction width ISAs. Instead of incorrectly applying that check to all ISAs, this change makes that the default check and lets ISA specific GDB classes override it.
2014-11-24misc: Another round of static analysis fixupsAndreas Hansson
Mostly addressing uninitialised members.
2014-11-17vnc: Add a conversion function for bgr888.Gabe Black
2014-11-14arm: Fixes based on UBSan and static analysisAndreas Hansson
Another churn to clean up undefined behaviour, mostly ARM, but some parts also touching the generic part of the code base. Most of the fixes are simply ensuring that proper intialisation. One of the more subtle changes is the return type of the sign-extension, which is changed to uint64_t. This is to avoid shifting negative values (undefined behaviour) in the ISA code.
2014-11-12base: Revert 9277177eccff and use getenv/setenv for UTC timeAndreas Hansson
This patch reverts changeset 9277177eccff which does not do what it was intended to do. In essence, we go back to implementing mkutctime much like the non-standard timegm extension.
2014-10-29arm: Fix multi-system AArch64 boot w/caches.Ali Saidi
Automatically extract cpu release address from DTB file. Check SCTLR_EL1 to verify all caches are enabled.
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.