d3d983caf9
Several large changes happen in this patch. The FDEntry class is rewritten so that file descriptors now correspond to types: 'File' which is normal file-backed file with the file open on the host machine, 'Pipe' which is a pipe that has been opened on the host machine, and 'Device' which does not have an open file on the host yet acts as a pseudo device with which to issue ioctls. Other types which might be added in the future are directory entries and sockets (off the top of my head). The FDArray class was create to hold most of the file descriptor handling that was stuffed into the Process class. It uses shared pointers and the std::array type to hold the FDEntries mentioned above. The changes to these two classes needed to be propagated out to the rest of the code so there were quite a few changes for that. Also, comments were added where I thought they were needed to help others and extend our DOxygen coverage.
210 lines
7.2 KiB
C++
210 lines
7.2 KiB
C++
/*
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* Copyright (c) 2014-2016 Advanced Micro Devices, Inc.
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* Copyright (c) 2001-2005 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Nathan Binkert
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* Steve Reinhardt
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* Brandon Potter
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*/
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#ifndef __PROCESS_HH__
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#define __PROCESS_HH__
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#include <inttypes.h>
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#include <map>
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#include <string>
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#include <vector>
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#include "arch/registers.hh"
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#include "base/statistics.hh"
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#include "base/types.hh"
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#include "config/the_isa.hh"
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#include "mem/se_translating_port_proxy.hh"
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#include "sim/fd_array.hh"
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#include "sim/fd_entry.hh"
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#include "sim/sim_object.hh"
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struct ProcessParams;
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class EmulatedDriver;
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class ObjectFile;
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class PageTableBase;
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class SyscallDesc;
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class SyscallReturn;
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class System;
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class ThreadContext;
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class Process : public SimObject
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{
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public:
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struct WaitRec
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{
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Addr waitChan;
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ThreadContext *waitingContext;
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WaitRec(Addr chan, ThreadContext *ctx)
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: waitChan(chan), waitingContext(ctx)
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{ }
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};
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Process(ProcessParams *params, ObjectFile *obj_file);
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void serialize(CheckpointOut &cp) const override;
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void unserialize(CheckpointIn &cp) override;
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void initState() override;
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DrainState drain() override;
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void syscall(int64_t callnum, ThreadContext *tc);
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virtual TheISA::IntReg getSyscallArg(ThreadContext *tc, int &i) = 0;
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virtual TheISA::IntReg getSyscallArg(ThreadContext *tc, int &i, int width);
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virtual void setSyscallArg(ThreadContext *tc, int i,
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TheISA::IntReg val) = 0;
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virtual void setSyscallReturn(ThreadContext *tc,
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SyscallReturn return_value) = 0;
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virtual SyscallDesc *getDesc(int callnum) = 0;
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inline uint64_t uid() { return _uid; }
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inline uint64_t euid() { return _euid; }
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inline uint64_t gid() { return _gid; }
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inline uint64_t egid() { return _egid; }
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inline uint64_t pid() { return _pid; }
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inline uint64_t ppid() { return _ppid; }
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const char *progName() const { return executable.c_str(); }
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std::string fullPath(const std::string &filename);
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std::string getcwd() const { return cwd; }
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/**
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* Find an emulated device driver.
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*
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* @param filename Name of the device (under /dev)
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* @return Pointer to driver object if found, else NULL
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*/
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EmulatedDriver *findDriver(std::string filename);
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// This function acts as a callback to update the bias value in
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// the object file because the parameters needed to calculate the
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// bias are not available when the object file is created.
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void updateBias();
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Addr getBias();
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Addr getStartPC();
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ObjectFile *getInterpreter();
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// override of virtual SimObject method: register statistics
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void regStats() override;
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void allocateMem(Addr vaddr, int64_t size, bool clobber = false);
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/// Attempt to fix up a fault at vaddr by allocating a page on the stack.
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/// @return Whether the fault has been fixed.
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bool fixupStackFault(Addr vaddr);
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// After getting registered with system object, tell process which
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// system-wide context id it is assigned.
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void
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assignThreadContext(ContextID context_id)
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{
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contextIds.push_back(context_id);
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}
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// Find a free context to use
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ThreadContext *findFreeContext();
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/**
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* Does mmap region grow upward or downward from mmap_end? Most
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* platforms grow downward, but a few (such as Alpha) grow upward
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* instead, so they can override this method to return false.
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*/
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virtual bool mmapGrowsDown() const { return true; }
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/**
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* Maps a contiguous range of virtual addresses in this process's
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* address space to a contiguous range of physical addresses.
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* This function exists primarily to expose the map operation to
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* python, so that configuration scripts can set up mappings in SE mode.
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*
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* @param vaddr The starting virtual address of the range.
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* @param paddr The starting physical address of the range.
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* @param size The length of the range in bytes.
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* @param cacheable Specifies whether accesses are cacheable.
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* @return True if the map operation was successful. (At this
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* point in time, the map operation always succeeds.)
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*/
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bool map(Addr vaddr, Addr paddr, int size, bool cacheable = true);
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// list of all blocked contexts
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std::list<WaitRec> waitList;
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// thread contexts associated with this process
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std::vector<ContextID> contextIds;
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// system object which owns this process
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System *system;
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Addr brk_point; // top of the data segment
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Addr stack_base; // stack segment base
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unsigned stack_size; // initial stack size
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Addr stack_min; // furthest address accessed from stack base
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Addr max_stack_size; // the maximum size allowed for the stack
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Addr next_thread_stack_base; // addr for next region w/ multithreaded apps
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Addr mmap_end; // base of automatic mmap region allocs
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Stats::Scalar num_syscalls; // track how many system calls are executed
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bool useArchPT; // flag for using architecture specific page table
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bool kvmInSE; // running KVM requires special initialization
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PageTableBase* pTable;
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SETranslatingPortProxy initVirtMem; // memory proxy for initial image load
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ObjectFile *objFile;
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std::vector<std::string> argv;
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std::vector<std::string> envp;
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std::string cwd;
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std::string executable;
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// Id of the owner of the process
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uint64_t _uid;
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uint64_t _euid;
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uint64_t _gid;
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uint64_t _egid;
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// pid of the process and it's parent
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uint64_t _pid;
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uint64_t _ppid;
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// Emulated drivers available to this process
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std::vector<EmulatedDriver *> drivers;
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std::shared_ptr<FDArray> fds;
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};
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#endif // __PROCESS_HH__
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