/*
- * Copyright (c) 2014 Advanced Micro Devices, Inc.
+ * Copyright (c) 2014-2016 Advanced Micro Devices, Inc.
* Copyright (c) 2001-2005 The Regents of The University of Michigan
* All rights reserved.
*
* 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
*/
#ifndef __PROCESS_HH__
#define __PROCESS_HH__
-#include <array>
+#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"
-struct LiveProcessParams;
+namespace Loader
+{
+class ObjectFile;
+} // namespace Loader
+
struct ProcessParams;
class EmulatedDriver;
-class PageTableBase;
+class EmulationPageTable;
class SyscallDesc;
class SyscallReturn;
class System;
class ThreadContext;
-template<class IntType>
-struct AuxVector
-{
- IntType a_type;
- IntType a_val;
-
- AuxVector()
- {}
-
- AuxVector(IntType type, IntType val);
-};
-
class Process : public SimObject
{
public:
+ Process(const ProcessParams ¶ms, EmulationPageTable *pTable,
+ ::Loader::ObjectFile *obj_file);
- /// Pointer to object representing the system this process is
- /// running on.
- System *system;
-
- // thread contexts associated with this process
- std::vector<ContextID> contextIds;
-
- // number of CPUs (esxec contexts, really) assigned to this process.
- unsigned int numCpus() { return contextIds.size(); }
-
- // record of blocked context
- struct WaitRec
- {
- Addr waitChan;
- ThreadContext *waitingContext;
-
- WaitRec(Addr chan, ThreadContext *ctx)
- : waitChan(chan), waitingContext(ctx)
- { }
- };
-
- // list of all blocked contexts
- std::list<WaitRec> waitList;
-
- Addr brk_point; // top of the data segment
-
- Addr stack_base; // stack segment base (highest address)
- unsigned stack_size; // initial stack size
- Addr stack_min; // lowest address accessed on the stack
-
- // The maximum size allowed for the stack.
- Addr max_stack_size;
-
- // addr to use for next stack region (for multithreaded apps)
- Addr next_thread_stack_base;
-
- // Base of region for mmaps (when user doesn't specify an address).
- Addr mmap_end;
-
- // 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 thie method to return false.
- virtual bool mmapGrowsDown() const { return true; }
-
- // Base of region for nxm data
- Addr nxm_start;
- Addr nxm_end;
-
- Stats::Scalar num_syscalls; // number of syscalls executed
-
- protected:
- // constructor
- Process(ProcessParams *params);
+ void serialize(CheckpointOut &cp) const override;
+ void unserialize(CheckpointIn &cp) override;
+ void init() override;
void initState() override;
-
DrainState drain() override;
- public:
-
- //This id is assigned by m5 and is used to keep process' tlb entries
- //separated.
- uint64_t M5_pid;
-
- // flag for using architecture specific page table
- bool useArchPT;
- // running KvmCPU in SE mode requires special initialization
- bool kvmInSE;
-
- PageTableBase* pTable;
+ virtual void syscall(ThreadContext *tc) { numSyscalls++; }
- protected:
- /// Memory proxy for initialization (image loading)
- SETranslatingPortProxy initVirtMem;
+ 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; }
- private:
- static const int NUM_FDS = 1024;
+ const char *progName() const { return executable.c_str(); }
- // File descriptor remapping support.
- std::shared_ptr<std::array<FDEntry, NUM_FDS>> fd_array;
+ /**
+ * 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);
- // Standard file descriptor options for initialization and checkpoints.
- std::map<std::string, int> imap;
- std::map<std::string, int> oemap;
+ // 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();
- public:
- // inherit file descriptor map from another process (necessary for clone)
- void inheritFDArray(Process *p);
+ void allocateMem(Addr vaddr, int64_t size, bool clobber = false);
- // override of virtual SimObject method: register statistics
- void regStats() override;
+ /// 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)
+ void
+ assignThreadContext(ContextID context_id)
{
contextIds.push_back(context_id);
}
- // Find a free context to use
- ThreadContext *findFreeContext();
-
- // provide program name for debug messages
- virtual const char *progName() const { return "<unknown>"; }
-
- // generate new target fd for sim_fd
- int allocFD(int sim_fd, const std::string& filename, int flags, int mode,
- bool pipe);
-
- // disassociate target fd with simulator fd and cleanup subsidiary fields
- void resetFDEntry(int tgt_fd);
-
- // look up simulator fd for given target fd
- int getSimFD(int tgt_fd);
-
- // look up fd entry for a given target fd
- FDEntry *getFDEntry(int tgt_fd);
-
- // look up target fd for given host fd
- // Assumes a 1:1 mapping between target file descriptor and host file
- // descriptor. Given the current API, this must be true given that it's
- // not possible to map multiple target file descriptors to the same host
- // file descriptor
- int getTgtFD(int sim_fd);
-
- // fix all offsets for currently open files and save them
- void fixFileOffsets();
-
- // find all offsets for currently open files and save them
- void findFileOffsets();
-
- // set the source of this read pipe for a checkpoint resume
- void setReadPipeSource(int read_pipe_fd, int source_fd);
-
- virtual void syscall(int64_t callnum, ThreadContext *tc) = 0;
-
- void allocateMem(Addr vaddr, int64_t size, bool clobber = false);
+ /**
+ * After delegating a thread context to a child process
+ * no longer should relate to the ThreadContext
+ */
+ void revokeThreadContext(int context_id);
- /// 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);
+ /**
+ * 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
*/
bool map(Addr vaddr, Addr paddr, int size, bool cacheable = true);
- void serialize(CheckpointOut &cp) const override;
- void unserialize(CheckpointIn &cp) override;
-};
+ void replicatePage(Addr vaddr, Addr new_paddr, ThreadContext *old_tc,
+ ThreadContext *new_tc, bool alloc_page);
-//
-// "Live" process with system calls redirected to host system
-//
-class ObjectFile;
-class LiveProcess : public Process
-{
- protected:
- ObjectFile *objFile;
- std::vector<std::string> argv;
- std::vector<std::string> envp;
- std::string cwd;
- std::string executable;
+ virtual void clone(ThreadContext *old_tc, ThreadContext *new_tc,
+ Process *new_p, RegVal flags);
- LiveProcess(LiveProcessParams *params, ObjectFile *objFile);
+ // thread contexts associated with this process
+ std::vector<ContextID> contextIds;
- // Id of the owner of the process
- uint64_t __uid;
- uint64_t __euid;
- uint64_t __gid;
- uint64_t __egid;
+ // system object which owns this process
+ System *system;
- // pid of the process and it's parent
- uint64_t __pid;
- uint64_t __ppid;
+ // 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;
- // Emulated drivers available to this process
- std::vector<EmulatedDriver *> drivers;
+ EmulationPageTable *pTable;
- public:
+ // Memory proxy for initial image load.
+ std::unique_ptr<SETranslatingPortProxy> initVirtMem;
- enum AuxiliaryVectorType {
- M5_AT_NULL = 0,
- M5_AT_IGNORE = 1,
- M5_AT_EXECFD = 2,
- M5_AT_PHDR = 3,
- M5_AT_PHENT = 4,
- M5_AT_PHNUM = 5,
- M5_AT_PAGESZ = 6,
- M5_AT_BASE = 7,
- M5_AT_FLAGS = 8,
- M5_AT_ENTRY = 9,
- M5_AT_NOTELF = 10,
- M5_AT_UID = 11,
- M5_AT_EUID = 12,
- M5_AT_GID = 13,
- M5_AT_EGID = 14,
- // The following may be specific to Linux
- M5_AT_PLATFORM = 15,
- M5_AT_HWCAP = 16,
- M5_AT_CLKTCK = 17,
-
- M5_AT_SECURE = 23,
- M5_BASE_PLATFORM = 24,
- M5_AT_RANDOM = 25,
-
- M5_AT_EXECFN = 31,
-
- M5_AT_VECTOR_SIZE = 44
+ /**
+ * 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 ¶ms,
+ ::Loader::ObjectFile *obj_file) = 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;}
+ // 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 ¶ms,
+ ::Loader::ObjectFile *obj_file);
- // provide program name for debug messages
- virtual const char *progName() const { return executable.c_str(); }
+ ::Loader::ObjectFile *objFile;
+ ::Loader::MemoryImage image;
+ ::Loader::MemoryImage interpImage;
+ std::vector<std::string> argv;
+ std::vector<std::string> envp;
+ std::string executable;
- std::string
- fullPath(const std::string &filename)
- {
- if (filename[0] == '/' || cwd.empty())
- return filename;
+ /**
+ * 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);
- std::string full = cwd;
+ /**
+ * 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;
- if (cwd[cwd.size() - 1] != '/')
- full += '/';
+ // Syscall emulation uname release.
+ std::string release;
- return full + filename;
- }
+ // Id of the owner of the process
+ uint64_t _uid;
+ uint64_t _euid;
+ uint64_t _gid;
+ uint64_t _egid;
- std::string getcwd() const { return cwd; }
+ // pid of the process and it's parent
+ uint64_t _pid;
+ uint64_t _ppid;
+ uint64_t _pgid;
+ uint64_t _tgid;
- virtual void syscall(int64_t callnum, ThreadContext *tc);
+ // Emulated drivers available to this process
+ std::vector<EmulatedDriver *> drivers;
- 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;
+ std::shared_ptr<FDArray> fds;
- virtual SyscallDesc *getDesc(int callnum) = 0;
+ bool *exitGroup;
+ std::shared_ptr<MemState> memState;
/**
- * Find an emulated device driver.
- *
- * @param filename Name of the device (under /dev)
- * @return Pointer to driver object if found, else NULL
+ * Calls a futex wakeup at the address specified by this pointer when
+ * this process exits.
*/
- 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();
+ uint64_t childClearTID;
- ObjectFile *getInterpreter();
+ // Process was forked with SIGCHLD set.
+ bool *sigchld;
- Addr getBias();
- Addr getStartPC();
-
- // this function is used to create the LiveProcess object, since
- // we can't tell which subclass of LiveProcess to use until we
- // open and look at the object file.
- static LiveProcess *create(LiveProcessParams *params);
+ Stats::Scalar numSyscalls; // track how many system calls are executed
};
-
#endif // __PROCESS_HH__
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