src/sim/process.hh

   1 /*
   2  * Copyright (c) 2001-2005 The Regents of The University of Michigan
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * Authors: Nathan Binkert
  29  *          Steve Reinhardt
  30  */
  31
  32 #ifndef __PROCESS_HH__
  33 #define __PROCESS_HH__
  34
  35 //
  36 // The purpose of this code is to fake the loader & syscall mechanism
  37 // when there's no OS: thus there's no reason to use it in FULL_SYSTEM
  38 // mode when we do have an OS.
  39 //
  40 #include "config/full_system.hh"
  41
  42 #if !FULL_SYSTEM
  43
  44 #include <string>
  45 #include <vector>
  46
  47 #include "arch/registers.hh"
  48 #include "base/statistics.hh"
  49 #include "base/types.hh"
  50 #include "config/the_isa.hh"
  51 #include "sim/sim_object.hh"
  52 #include "sim/syscallreturn.hh"
  53
  54 class PageTable;
  55 class ProcessParams;
  56 class LiveProcessParams;
  57 class SyscallDesc;
  58 class System;
  59 class ThreadContext;
  60 class TranslatingPort;
  61
  62 template<class IntType>
  63 struct AuxVector
  64 {
  65     IntType a_type;
  66     IntType a_val;
  67
  68     AuxVector()
  69     {}
  70
  71     AuxVector(IntType type, IntType val);
  72 };
  73
  74 class Process : public SimObject
  75 {
  76   public:
  77
  78     /// Pointer to object representing the system this process is
  79     /// running on.
  80     System *system;
  81
  82     bool checkpointRestored;
  83
  84     // thread contexts associated with this process
  85     std::vector<int> contextIds;
  86
  87     // number of CPUs (esxec contexts, really) assigned to this process.
  88     unsigned int numCpus() { return contextIds.size(); }
  89
  90     // record of blocked context
  91     struct WaitRec
  92     {
  93         Addr waitChan;
  94         ThreadContext *waitingContext;
  95
  96         WaitRec(Addr chan, ThreadContext *ctx)
  97             : waitChan(chan), waitingContext(ctx)
  98         {       }
  99     };
 100
 101     // list of all blocked contexts
 102     std::list<WaitRec> waitList;
 103
 104     Addr brk_point;             // top of the data segment
 105
 106     Addr stack_base;            // stack segment base (highest address)
 107     unsigned stack_size;        // initial stack size
 108     Addr stack_min;             // lowest address accessed on the stack
 109
 110     // The maximum size allowed for the stack.
 111     Addr max_stack_size;
 112
 113     // addr to use for next stack region (for multithreaded apps)
 114     Addr next_thread_stack_base;
 115
 116     // Base of region for mmaps (when user doesn't specify an address).
 117     Addr mmap_start;
 118     Addr mmap_end;
 119
 120     // Base of region for nxm data
 121     Addr nxm_start;
 122     Addr nxm_end;
 123
 124     std::string prog_fname;     // file name
 125
 126     Stats::Scalar num_syscalls;       // number of syscalls executed
 127
 128
 129   protected:
 130     // constructor
 131     Process(ProcessParams * params);
 132
 133     // post initialization startup
 134     virtual void startup();
 135
 136   protected:
 137     /// Memory object for initialization (image loading)
 138     TranslatingPort *initVirtMem;
 139
 140   public:
 141     PageTable *pTable;
 142
 143     //This id is assigned by m5 and is used to keep process' tlb entries
 144     //separated.
 145     uint64_t M5_pid;
 146
 147     class FdMap
 148     {
 149       public:
 150             int fd;
 151             std::string filename;
 152             int mode;
 153             int flags;
 154             bool isPipe;
 155             int readPipeSource;
 156             uint64_t fileOffset;
 157
 158
 159             FdMap()
 160             {
 161                     fd = -1;
 162                     filename = "NULL";
 163                     mode = 0;
 164                     flags = 0;
 165                     isPipe = false;
 166                     readPipeSource = 0;
 167                     fileOffset = 0;
 168
 169             }
 170
 171         void serialize(std::ostream &os);
 172         void unserialize(Checkpoint *cp, const std::string &section);
 173
 174     };
 175
 176   private:
 177     // file descriptor remapping support
 178     static const int MAX_FD = 256;    // max legal fd value
 179     FdMap fd_map[MAX_FD+1];
 180
 181
 182   public:
 183     // static helper functions to generate file descriptors for constructor
 184     static int openInputFile(const std::string &filename);
 185     static int openOutputFile(const std::string &filename);
 186
 187     // override of virtual SimObject method: register statistics
 188     virtual void regStats();
 189
 190     // After getting registered with system object, tell process which
 191     // system-wide context id it is assigned.
 192     void assignThreadContext(int context_id)
 193     {
 194         contextIds.push_back(context_id);
 195     }
 196
 197     // Find a free context to use
 198     ThreadContext * findFreeContext();
 199
 200     // map simulator fd sim_fd to target fd tgt_fd
 201     void dup_fd(int sim_fd, int tgt_fd);
 202
 203     // generate new target fd for sim_fd
 204     int alloc_fd(int sim_fd, std::string filename, int flags, int mode, bool pipe);
 205
 206     // free target fd (e.g., after close)
 207     void free_fd(int tgt_fd);
 208
 209     // look up simulator fd for given target fd
 210     int sim_fd(int tgt_fd);
 211
 212     // look up simulator fd_map object for a given target fd
 213     FdMap * sim_fd_obj(int tgt_fd);
 214
 215     // fix all offsets for currently open files and save them
 216     void fix_file_offsets();
 217
 218     // find all offsets for currently open files and save them
 219     void find_file_offsets();
 220
 221     // set the source of this read pipe for a checkpoint resume
 222     void setReadPipeSource(int read_pipe_fd, int source_fd);
 223
 224     virtual void syscall(int64_t callnum, ThreadContext *tc) = 0;
 225
 226     // check if the this addr is on the next available page and allocate it
 227     // if it's not we'll panic
 228     bool checkAndAllocNextPage(Addr vaddr);
 229
 230     void serialize(std::ostream &os);
 231     void unserialize(Checkpoint *cp, const std::string &section);
 232 };
 233
 234 //
 235 // "Live" process with system calls redirected to host system
 236 //
 237 class ObjectFile;
 238 class LiveProcess : public Process
 239 {
 240   protected:
 241     ObjectFile *objFile;
 242     std::vector<std::string> argv;
 243     std::vector<std::string> envp;
 244     std::string cwd;
 245
 246     LiveProcess(LiveProcessParams * params, ObjectFile *objFile);
 247
 248     // Id of the owner of the process
 249     uint64_t __uid;
 250     uint64_t __euid;
 251     uint64_t __gid;
 252     uint64_t __egid;
 253
 254     // pid of the process and it's parent
 255     uint64_t __pid;
 256     uint64_t __ppid;
 257
 258   public:
 259
 260     enum AuxiliaryVectorType {
 261         M5_AT_NULL = 0,
 262         M5_AT_IGNORE = 1,
 263         M5_AT_EXECFD = 2,
 264         M5_AT_PHDR = 3,
 265         M5_AT_PHENT = 4,
 266         M5_AT_PHNUM = 5,
 267         M5_AT_PAGESZ = 6,
 268         M5_AT_BASE = 7,
 269         M5_AT_FLAGS = 8,
 270         M5_AT_ENTRY = 9,
 271         M5_AT_NOTELF = 10,
 272         M5_AT_UID = 11,
 273         M5_AT_EUID = 12,
 274         M5_AT_GID = 13,
 275         M5_AT_EGID = 14,
 276         // The following may be specific to Linux
 277         M5_AT_PLATFORM = 15,
 278         M5_AT_HWCAP = 16,
 279         M5_AT_CLKTCK = 17,
 280
 281         M5_AT_SECURE = 23,
 282         M5_BASE_PLATFORM = 24,
 283         M5_AT_RANDOM = 25,
 284
 285         M5_AT_EXECFN = 31,
 286
 287         M5_AT_VECTOR_SIZE = 44
 288     };
 289
 290     inline uint64_t uid() {return __uid;}
 291     inline uint64_t euid() {return __euid;}
 292     inline uint64_t gid() {return __gid;}
 293     inline uint64_t egid() {return __egid;}
 294     inline uint64_t pid() {return __pid;}
 295     inline uint64_t ppid() {return __ppid;}
 296
 297     std::string
 298     fullPath(const std::string &filename)
 299     {
 300         if (filename[0] == '/' || cwd.empty())
 301             return filename;
 302
 303         std::string full = cwd;
 304
 305         if (cwd[cwd.size() - 1] != '/')
 306             full += '/';
 307
 308         return full + filename;
 309     }
 310
 311     std::string getcwd() const { return cwd; }
 312
 313     virtual void syscall(int64_t callnum, ThreadContext *tc);
 314
 315     virtual TheISA::IntReg getSyscallArg(ThreadContext *tc, int &i) = 0;
 316     virtual TheISA::IntReg getSyscallArg(ThreadContext *tc, int &i, int width);
 317     virtual void setSyscallArg(ThreadContext *tc,
 318             int i, TheISA::IntReg val) = 0;
 319     virtual void setSyscallReturn(ThreadContext *tc,
 320             SyscallReturn return_value) = 0;
 321
 322     virtual SyscallDesc* getDesc(int callnum) = 0;
 323
 324     // this function is used to create the LiveProcess object, since
 325     // we can't tell which subclass of LiveProcess to use until we
 326     // open and look at the object file.
 327     static LiveProcess *create(LiveProcessParams * params);
 328 };
 329
 330
 331 #endif // !FULL_SYSTEM
 332
 333 #endif // __PROCESS_HH__