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