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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.
2015-07-07sim: Refactor and simplify the drain APIAndreas Sandberg
The drain() call currently passes around a DrainManager pointer, which is now completely pointless since there is only ever one global DrainManager in the system. It also contains vestiges from the time when SimObjects had to keep track of their child objects that needed draining. This changeset moves all of the DrainState handling to the Drainable base class and changes the drain() and drainResume() calls to reflect this. Particularly, the drain() call has been updated to take no parameters (the DrainManager argument isn't needed) and return a DrainState instead of an unsigned integer (there is no point returning anything other than 0 or 1 any more). Drainable objects should return either DrainState::Draining (equivalent to returning 1 in the old system) if they need more time to drain or DrainState::Drained (equivalent to returning 0 in the old system) if they are already in a consistent state. Returning DrainState::Running is considered an error. Drain done signalling is now done through the signalDrainDone() method in the Drainable class instead of using the DrainManager directly. The new call checks if the state of the object is DrainState::Draining before notifying the drain manager. This means that it is safe to call signalDrainDone() without first checking if the simulator has requested draining. The intention here is to reduce the code needed to implement draining in simple objects.
2015-07-07sim: Decouple draining from the SimObject hierarchyAndreas Sandberg
Draining is currently done by traversing the SimObject graph and calling drain()/drainResume() on the SimObjects. This is not ideal when non-SimObjects (e.g., ports) need draining since this means that SimObjects owning those objects need to be aware of this. This changeset moves the responsibility for finding objects that need draining from SimObjects and the Python-side of the simulator to the DrainManager. The DrainManager now maintains a set of all objects that need draining. To reduce the overhead in classes owning non-SimObjects that need draining, objects inheriting from Drainable now automatically register with the DrainManager. If such an object is destroyed, it is automatically unregistered. This means that drain() and drainResume() should never be called directly on a Drainable object. While implementing the new functionality, the DrainManager has now been made thread safe. In practice, this means that it takes a lock whenever it manipulates the set of Drainable objects since SimObjects in different threads may create Drainable objects dynamically. Similarly, the drain counter is now an atomic_uint, which ensures that it is manipulated correctly when objects signal that they are done draining. A nice side effect of these changes is that it makes the drain state changes stricter, which the simulation scripts can exploit to avoid redundant drains.
2015-07-07sim: Move mem(Writeback|Invalidate) to SimObjectAndreas Sandberg
The memWriteback() and memInvalidate() calls used to live in the Serializable interface. In this series of patches, the Serializable interface will be redesigned to make serialization independent of the object graph and always work on the entire simulator. This means that the Serialization interface won't be useful to perform maintenance of the caches in a sub-graph of the entire SimObject graph. This changeset moves these memory maintenance methods to the SimObject interface instead.
2015-07-07sim: Make the drain state a global typed enumAndreas Sandberg
The drain state enum is currently a part of the Drainable interface. The same state machine will be used by the DrainManager to identify the global state of the simulator. Make the drain state a global typed enum to better cater for this usage scenario.
2015-07-07sim: Add macros to serialize objects into a sectionAndreas Sandberg
Add the SERIALIZE_OBJ / UNSERIALIZE_OBJ macros that serialize an object into a subsection of the current checkpoint section.
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: Fix broken event unserializationAndreas Sandberg
Events expected to be unserialized using an event-specific unserializeEvent call. This call was never actually used, which meant the events relying on it never got unserialized (or scheduled after unserialization). Instead of relying on a custom call, we now use the normal serialization code again. In order to schedule the event correctly, the parrent object is expected to use the EventQueue::checkpointReschedule() call. This happens automatically for events that are serialized using the AutoSerialize mechanism.
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.
2015-07-07sim: Add serialization macros for std containersAndreas Sandberg
2015-06-01sim, arm: add checkpoint upgrader for d02b45a5Curtis Dunham
The insertion of CONTEXTIDR_EL2 in the ARM miscellaneous registers obsoletes old checkpoints.
2015-05-26arm: Implement some missing syscalls (SE mode)Giacomo Gabrielli
Adding a few syscalls that were previously considered unimplemented.
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.
2015-05-15sim: Don't clear the active CPU vector in System::initStateAndreas Sandberg
The system class currently clears the vector of active CPUs in initState(). CPUs are added to the list by registerThreadContext() which is called from BaseCPU::init(). This obviously breaks when the System object is initialized after the CPUs. This changeset removes the offending clear() call since the list will be empty after it has been instantiated anyway.
2015-05-05syscall_emul: fix warn_once behaviorSteve Reinhardt
The current ignoreWarnOnceFunc doesn't really work as expected, since it will only generate one warning total, for whichever "warn-once" syscall is invoked first. This patch fixes that behavior by keeping a "warned" flag in the SyscallDesc object, allowing suitably flagged syscalls to warn exactly once per syscall.
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>
2015-04-22syscall_emul: implement clock_gettime system callBrandon Potter
2015-04-22syscall_emul: update getrlimit to use warnBrandon Potter
Don't use std::cerr directly, and just return EINVAL instead of aborting.
2015-04-22syscall_emul: fix warning with wrong syscall nameBrandon Potter
Also nix extra whitespace.
2015-04-13sim: Use NULL instead of None for testing filenames.Nilay Vaish
The filenames are initialized with NULL. So the test should be checking for them to be == NULL instead == None.
2015-04-13sim: fix function for emulating dup()Nilay Vaish
The function was using the host fd to obtain the fd object from the simulated process.
2015-04-03sim: correct check for endianessRuslan Bukin
Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2015-03-26sim: Update limit_event reuse to final versionCurtis Dunham
Matching final version on reviewboard.
2015-03-23sim: Reuse the same limit_event in simulate()Curtis Dunham
This patch accomplishes two things: 1. Makes simulate()'s GlobalSimLoopExitEvent a singleton reused across calls. This is slightly more efficient than recreating it every time. 2. Gives callers to simulate() (especially other simulators) a foolproof way of knowing that the simulation period ended successfully by hitting the limit event. They can call getLimitEvent() and compare it to the return value of simulate(). This change was motivated by an ongoing effort to integrate gem5 and SST, with SST as the master sim and gem5 as the slave sim.
2015-03-02mem: Split port retry for all different packet classesAndreas Hansson
This patch fixes a long-standing isue with the port flow control. Before this patch the retry mechanism was shared between all different packet classes. As a result, a snoop response could get stuck behind a request waiting for a retry, even if the send/recv functions were split. This caused message-dependent deadlocks in stress-test scenarios. The patch splits the retry into one per packet (message) class. Thus, sendTimingReq has a corresponding recvReqRetry, sendTimingResp has recvRespRetry etc. Most of the changes to the code involve simply clarifying what type of request a specific object was accepting. The biggest change in functionality is in the cache downstream packet queue, facing the memory. This queue was shared by requests and snoop responses, and it is now split into two queues, each with their own flow control, but the same physical MasterPort. These changes fixes the previously seen deadlocks.
2015-02-16mem: mmap the backing store with MAP_NORESERVEAndreas Hansson
This patch ensures we can run simulations with very large simulated memories (at least 64 TB based on some quick runs on a Linux workstation). In essence this allows us to efficiently deal with sparse address maps without having to implement a redirection layer in the backing store. This opens up for run-time errors if we eventually exhausts the hosts memory and swap space, but this should hopefully never happen.
2015-02-11sim: Move the BaseTLB to src/arch/generic/Andreas Sandberg
The TLB-related code is generally architecture dependent and should live in the arch directory to signify that. --HG-- rename : src/sim/BaseTLB.py => src/arch/generic/BaseTLB.py rename : src/sim/tlb.cc => src/arch/generic/tlb.cc rename : src/sim/tlb.hh => src/arch/generic/tlb.hh
2015-02-03sim: Remove test for non-NULL this in EventAndreas Sandberg
The method Event::initialized() tests if this != NULL as a part of the expression that tests if an event is initialized. The only case when this check could be false is if the method is called on a null pointer, which is illegal and leads to undefined behavior (such as eating your pets) according to the C++ standard. Because of this, modern compilers (specifically, recent versions of clang) warn about this which we treat as an error. This changeset removes the redundant check to fix said warning.
2014-12-19sim: prioritize async events; prevent starvationCurtis Dunham
If a time quantum event is the only one in the queue, async events (Ctrl-C, I/O, etc.) will never be processed. So process them first.
2015-01-25sim: Clean up InstRecordAli Saidi
Track memory size and flags as well as add some comments and consts.
2015-01-25cpu: Remove all notion that we know when the cpu is misspeculating.Ali Saidi
We have no way of knowing if a CPU model is on the wrong path with our execute-in-execute CPU models. Don't pretend that we do.
2015-01-03arm: Add unlinkat syscall implementationmike upton
added ARM aarch64 unlinkat syscall support, modeled on other <xxx>at syscalls. This gets all of the cpu2006 int workloads passing in SE mode on aarch64. Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2014-12-27syscall_emul: Return correct writev valueJoel Hestness
According to Linux man pages, if writev is successful, it returns the total number of bytes written. Otherwise, it returns an error code. Instead of returning 0, return the result from the actual call to writev in the system call.
2014-11-24misc: Another round of static analysis fixupsAndreas Hansson
Mostly addressing uninitialised members.
2014-11-23mem: Page Table map api modificationAlexandru Dutu
This patch adds uncacheable/cacheable and read-only/read-write attributes to the map method of PageTableBase. It also modifies the constructor of TlbEntry structs for all architectures to consider the new attributes.
2014-11-23x86: Segment initialization to support KvmCPU in SEAlexandru Dutu
This patch sets up low and high privilege code and data segments and places them in the following order: cs low, ds low, ds, cs, in the GDT. Additionally, a syscall and page fault handler for KvmCPU in SE mode are defined. The order of the segment selectors in GDT is required in this manner for interrupt handling to work properly. Segment initialization is done for all the thread contexts.
2014-11-23kvm, x86: Adding support for SE mode executionAlexandru Dutu
This patch adds methods in KvmCPU model to handle KVM exits caused by syscall instructions and page faults. These types of exits will be encountered if KvmCPU is run in SE mode.
2014-09-02syscall_emul: add retry flag to SyscallReturnSteve Reinhardt
This hook allows blocking emulated system calls to indicate that they would block, but return control to the simulator so that the simulation does not hang. The actual retry functionality requires additional support, to be provided in a future changeset.
2014-10-22syscall_emul: minor style fix to LiveProcess constructorSteve Reinhardt
2014-10-22syscall_emul: devirtualize BaseBufferArg methodsSteve Reinhardt
Not clear why they were marked virtual to begin with, but that doesn't appear to be necessary.
2014-10-22syscall_emul: Put BufferArg classes in a separate header.Steve Reinhardt
Move the BufferArg classes that support syscall buffer args (i.e., pointers into simulated user space) out of syscall_emul.hh and into a new header syscall_emul_buf.hh so they are accessible to emulated driver implementations. Take the opportunity to add some comments as well.
2014-10-22syscall_emul: add EmulatedDriver objectSteve Reinhardt
Fake SE-mode device drivers can now be added by deriving from this abstract object.
2014-10-22sim: revert 6709bbcf564dNilay Vaish
The identifier SYS_getdents is not available on Mac OS X. Therefore, its use results in compilation failure. It seems there is no straight forward way to implement the system call getdents using readdir() or similar C functions. Hence the commit 6709bbcf564d is being rolled back.
2014-10-20x86: Fixes to avoid LTO warningsAndreas Hansson
This patch fixes a few minor issues that caused link-time warnings when using LTO, mainly for x86. The most important change is how the syscall array is created. Previously gcc and clang would complain that the declaration and definition types did not match. The organisation is now changed to match how it is done for ARM, moving the code that was previously in syscalls.cc into process.cc, and having a class variable pointing to the static array. With these changes, there are no longer any warnings using gcc 4.6.3 with LTO.
2014-10-20sim: invalid alignment checks in mmap and mremapTom Jablin
Presently, the alignment checks in the mmap and mremap implementations in syscall_emul.hh are wrong. The checks are implemented as: if ((start % TheISA::PageBytes) != 0 || (length % TheISA::PageBytes) != 0) { warn("mmap failing: arguments not page-aligned: " "start 0x%x length 0x%x", start, length); return -EINVAL; } This checks that both the start and the length arguments of the mmap syscall are checked for page-alignment. However, the POSIX specification says: The off argument is constrained to be aligned and sized according to the value returned by sysconf() when passed _SC_PAGESIZE or _SC_PAGE_SIZE. When MAP_FIXED is specified, the application shall ensure that the argument addr also meets these constraints. The implementation performs mapping operations over whole pages. Thus, while the argument len need not meet a size or alignment constraint, the implementation shall include, in any mapping operation, any partial page specified by the range [pa,pa+len). So the length parameter should not be checked for page-alignment. By contrast, the current implementation fails to check the offset argument, which must be page aligned. Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2014-10-20sim: mmap: correct behavior for fixed addressMichael Adler
Change mmap fixed address request to return an error if the mapping is impossible due to conflict instead of what I believe used to be silent corruption. Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2014-10-20sim: implement getdents/getdents64 in user modeMichael Adler
Has been tested only for alpha. Committed by: Nilay Vaish <nilay@cs.wisc.edu>