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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.
*/
#ifndef __PROCESS_HH__
#define __PROCESS_HH__
#include <inttypes.h>
#include <map>
#include <memory>
#include <string>
#include <vector>
#include "arch/registers.hh"
#include "base/loader/memory_image.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/mem_state.hh"
#include "sim/sim_object.hh"
namespace Loader
{
class ObjectFile;
} // namespace Loader
struct ProcessParams;
class EmulatedDriver;
class EmulationPageTable;
class SyscallDesc;
class SyscallReturn;
class System;
class ThreadContext;
class Process : public SimObject
{
public:
Process(const ProcessParams &params, EmulationPageTable *pTable,
::Loader::ObjectFile *obj_file);
void serialize(CheckpointOut &cp) const override;
void unserialize(CheckpointIn &cp) override;
void init() override;
void initState() override;
DrainState drain() override;
virtual void syscall(ThreadContext *tc) { numSyscalls++; }
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; }
inline uint64_t pgid() { return _pgid; }
inline void pgid(uint64_t pgid) { _pgid = pgid; }
inline uint64_t tgid() { return _tgid; }
const char *progName() const { return executable.c_str(); }
/**
* Find an emulated device driver.
*
* @param filename Name of the device (under /dev)
* @return Pointer to driver object if found, else nullptr
*/
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();
::Loader::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 fixupFault(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);
}
/**
* After delegating a thread context to a child process
* no longer should relate to the ThreadContext
*/
void revokeThreadContext(int context_id);
/**
* Does mmap region grow upward or downward from mmapEnd? 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);
void replicatePage(Addr vaddr, Addr new_paddr, ThreadContext *old_tc,
ThreadContext *new_tc, bool alloc_page);
virtual void clone(ThreadContext *old_tc, ThreadContext *new_tc,
Process *new_p, RegVal flags);
// thread contexts associated with this process
std::vector<ContextID> contextIds;
// system object which owns this process
System *system;
Stats::Scalar numSyscalls; // track how many system calls are executed
// flag for using architecture specific page table
bool useArchPT;
// running KVM requires special initialization
bool kvmInSE;
// flag for using the process as a thread which shares page tables
bool useForClone;
EmulationPageTable *pTable;
// Memory proxy for initial image load.
std::unique_ptr<SETranslatingPortProxy> initVirtMem;
/**
* Each instance of a Loader subclass will have a chance to try to load
* an object file when tryLoaders is called. If they can't because they
* aren't compatible with it (wrong arch, wrong OS, etc), then they
* silently fail by returning nullptr so other loaders can try.
*/
class Loader
{
public:
Loader();
/* Loader instances are singletons. */
Loader(const Loader &) = delete;
void operator=(const Loader &) = delete;
virtual ~Loader() {}
/**
* Each subclass needs to implement this method. If the loader is
* compatible with the passed in object file, it should return the
* created Process object corresponding to it. If not, it should fail
* silently and return nullptr. If there's a non-compatibliity related
* error like file IO errors, etc., those should fail non-silently
* with a panic or fail as normal.
*/
virtual Process *load(const ProcessParams &params,
::Loader::ObjectFile *obj_file) = 0;
};
// Try all the Loader instance's "load" methods one by one until one is
// successful. If none are, complain and fail.
static Process *tryLoaders(const ProcessParams &params,
::Loader::ObjectFile *obj_file);
::Loader::ObjectFile *objFile;
::Loader::MemoryImage image;
::Loader::MemoryImage interpImage;
std::vector<std::string> argv;
std::vector<std::string> envp;
std::string executable;
/**
* Return an absolute path given a relative path paired with the current
* working directory of the process running under simulation.
*
* @param path The relative path (generally a filename) that needs the
* current working directory prepended.
* @param host_fs A flag which determines whether to return a
* path for the host filesystem or the filesystem of the process running
* under simulation. Only matters if filesysem redirection is used to
* replace files (or directories) that would normally appear via the
* host filesystem.
* @return String containing an absolute path.
*/
std::string absolutePath(const std::string &path, bool host_fs);
/**
* Redirect file path if it matches any keys initialized by system object.
* @param filename An input parameter containing either a relative path
* or an absolute path. If given a relative path, the path will be
* prepended to the current working directory of the simulation with
* respect to the host filesystem.
* @return String containing an absolute path.
*/
std::string checkPathRedirect(const std::string &filename);
/**
* The cwd members are used to track changes to the current working
* directory for the purpose of executing system calls which depend on
* relative paths (i.e. open, chdir).
*
* The tgt member and host member may differ if the path for the current
* working directory is redirected to point to a different location
* (i.e. `cd /proc` should point to '$(gem5_repo)/m5out/fs/proc'
* instead of '/proc').
*/
std::string tgtCwd;
std::string hostCwd;
// Syscall emulation uname release.
std::string release;
// 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;
uint64_t _pgid;
uint64_t _tgid;
// Emulated drivers available to this process
std::vector<EmulatedDriver *> drivers;
std::shared_ptr<FDArray> fds;
bool *exitGroup;
std::shared_ptr<MemState> memState;
/**
* Calls a futex wakeup at the address specified by this pointer when
* this process exits.
*/
uint64_t childClearTID;
// Process was forked with SIGCHLD set.
bool *sigchld;
};
#endif // __PROCESS_HH__