#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 ProcessParams;
class EmulatedDriver;
class ObjectFile;
-class PageTableBase;
+class EmulationPageTable;
class SyscallDesc;
class SyscallReturn;
class System;
class Process : public SimObject
{
public:
-
- struct MemState
- {
- Addr brkPoint;
- Addr stackBase;
- unsigned stackSize;
- Addr stackMin;
- Addr nextThreadStackBase;
- Addr mmapEnd;
-
- MemState()
- : brkPoint(0), stackBase(0), stackSize(0), stackMin(0),
- nextThreadStackBase(0), mmapEnd(0)
- { }
-
- MemState&
- operator=(const MemState &in)
- {
- if (this == &in)
- return *this;
-
- brkPoint = in.brkPoint;
- stackBase = in.stackBase;
- stackSize = in.stackSize;
- stackMin = in.stackMin;
- nextThreadStackBase = in.nextThreadStackBase;
- mmapEnd = in.mmapEnd;
- return *this;
- }
-
- void serialize(CheckpointOut &cp) const;
- void unserialize(CheckpointIn &cp);
- };
-
- Process(ProcessParams *params, ObjectFile *obj_file);
+ Process(ProcessParams *params, EmulationPageTable *pTable,
+ ObjectFile *obj_file);
void serialize(CheckpointOut &cp) const override;
void unserialize(CheckpointIn &cp) override;
+ void init() 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 syscall(int64_t callnum, ThreadContext *tc, Fault *fault);
+ virtual RegVal getSyscallArg(ThreadContext *tc, int &i) = 0;
+ virtual RegVal getSyscallArg(ThreadContext *tc, int &i, int width);
+ virtual void setSyscallArg(ThreadContext *tc, int i, RegVal val) = 0;
virtual void setSyscallReturn(ThreadContext *tc,
SyscallReturn return_value) = 0;
virtual SyscallDesc *getDesc(int callnum) = 0;
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; }
- inline void setpgid(uint64_t pgid) { _pgid = pgid; }
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
+ * @return Pointer to driver object if found, else nullptr
*/
EmulatedDriver *findDriver(std::string filename);
void replicatePage(Addr vaddr, Addr new_paddr, ThreadContext *old_tc,
ThreadContext *new_tc, bool alloc_page);
- void clone(ThreadContext *old_tc, ThreadContext *new_tc, Process *new_p,
- TheISA::IntReg flags);
+ virtual void clone(ThreadContext *old_tc, ThreadContext *new_tc,
+ Process *new_p, RegVal flags);
// thread contexts associated with this process
std::vector<ContextID> contextIds;
Stats::Scalar numSyscalls; // track how many system calls are executed
- bool useArchPT; // flag for using architecture specific page table
- bool kvmInSE; // running KVM requires special initialization
+ // 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;
- PageTableBase* pTable;
+ EmulationPageTable *pTable;
SETranslatingPortProxy initVirtMem; // memory proxy for initial image load
+ /**
+ * 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(ProcessParams *params, 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(ProcessParams *params, ObjectFile *obj_file);
+
ObjectFile *objFile;
+ MemoryImage image;
+ MemoryImage interpImage;
std::vector<std::string> argv;
std::vector<std::string> envp;
- std::string cwd;
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;
std::shared_ptr<FDArray> fds;
bool *exitGroup;
-
- Addr maxStackSize;
- MemState *memState;
+ std::shared_ptr<MemState> memState;
/**
* Calls a futex wakeup at the address specified by this pointer when
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