* 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__
#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 "sim/mem_state.hh"
#include "sim/sim_object.hh"
+namespace Loader
+{
+class ObjectFile;
+} // namespace Loader
+
struct ProcessParams;
class EmulatedDriver;
-class ObjectFile;
class EmulationPageTable;
class SyscallDesc;
class SyscallReturn;
class Process : public SimObject
{
public:
- Process(ProcessParams *params, EmulationPageTable *pTable,
- ObjectFile *obj_file);
+ Process(const ProcessParams ¶ms, 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(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;
+ virtual void syscall(ThreadContext *tc) { numSyscalls++; }
inline uint64_t uid() { return _uid; }
inline uint64_t euid() { return _euid; }
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.
void updateBias();
Addr getBias();
Addr getStartPC();
- ObjectFile *getInterpreter();
-
- // override of virtual SimObject method: register statistics
- void regStats() override;
+ ::Loader::ObjectFile *getInterpreter();
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);
+ bool fixupFault(Addr vaddr);
// After getting registered with system object, tell process which
// system-wide context id it is assigned.
contextIds.push_back(context_id);
}
- // Find a free context to use
- ThreadContext *findFreeContext();
-
/**
* After delegating a thread context to a child process
* no longer should relate to the ThreadContext
// 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
EmulationPageTable *pTable;
- SETranslatingPortProxy initVirtMem; // memory proxy for initial image load
+ // Memory proxy for initial image load.
+ std::unique_ptr<SETranslatingPortProxy> initVirtMem;
- ObjectFile *objFile;
+ /**
+ * 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;
+ };
+
+ // 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);
+
+ ::Loader::ObjectFile *objFile;
+ ::Loader::MemoryImage image;
+ ::Loader::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;
// Process was forked with SIGCHLD set.
bool *sigchld;
+
+ Stats::Scalar numSyscalls; // track how many system calls are executed
};
#endif // __PROCESS_HH__
projects / gem5.git / blobdiff