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#include <string> 36#include <vector> 37 38#include "arch/registers.hh" 39#include "base/statistics.hh" 40#include "base/types.hh" 41#include "config/the_isa.hh" 42#include "sim/sim_object.hh" 43#include "sim/syscallreturn.hh" 44 45class PageTable; 46class ProcessParams; 47class LiveProcessParams; 48class SyscallDesc; 49class System; 50class ThreadContext; 51class TranslatingPort; 52 53template<class IntType> 54struct AuxVector 55{ 56 IntType a_type; 57 IntType a_val; 58 59 AuxVector() 60 {} 61 62 AuxVector(IntType type, IntType val); 63}; 64 65class Process : public SimObject 66{ 67 public: 68 69 /// Pointer to object representing the system this process is 70 /// running on. 71 System *system; 72 73 // thread contexts associated with this process 74 std::vector<int> contextIds; 75 76 // number of CPUs (esxec contexts, really) assigned to this process. 77 unsigned int numCpus() { return contextIds.size(); } 78 79 // record of blocked context 80 struct WaitRec 81 { 82 Addr waitChan; 83 ThreadContext *waitingContext; 84 85 WaitRec(Addr chan, ThreadContext *ctx) 86 : waitChan(chan), waitingContext(ctx) 87 { } 88 }; 89 90 // list of all blocked contexts 91 std::list<WaitRec> waitList; 92 93 Addr brk_point; // top of the data segment 94 95 Addr stack_base; // stack segment base (highest address) 96 unsigned stack_size; // initial stack size 97 Addr stack_min; // lowest address accessed on the stack 98 99 // The maximum size allowed for the stack. 100 Addr max_stack_size; 101 102 // addr to use for next stack region (for multithreaded apps) 103 Addr next_thread_stack_base; 104 105 // Base of region for mmaps (when user doesn't specify an address). 106 Addr mmap_start; 107 Addr mmap_end; 108 109 // Base of region for nxm data 110 Addr nxm_start; 111 Addr nxm_end; 112 113 std::string prog_fname; // file name 114 115 Stats::Scalar num_syscalls; // number of syscalls executed 116 117 118 protected: 119 // constructor 120 Process(ProcessParams *params); 121 122 virtual void initState(); 123 124 protected: 125 /// Memory object for initialization (image loading) 126 TranslatingPort *initVirtMem; 127 128 public: 129 PageTable *pTable; 130 131 //This id is assigned by m5 and is used to keep process' tlb entries 132 //separated. 133 uint64_t M5_pid; 134 135 class FdMap 136 { 137 public: 138 int fd; 139 std::string filename; 140 int mode; 141 int flags; 142 bool isPipe; 143 int readPipeSource; 144 uint64_t fileOffset; 145 146 FdMap() 147 : fd(-1), filename("NULL"), mode(0), flags(0), 148 isPipe(false), readPipeSource(0), fileOffset(0) 149 { } 150 151 void serialize(std::ostream &os); 152 void unserialize(Checkpoint *cp, const std::string §ion); 153 }; 154 155 private: 156 // file descriptor remapping support 157 static const int MAX_FD = 256; // max legal fd value 158 FdMap fd_map[MAX_FD+1]; 159 160 161 public: 162 // static helper functions to generate file descriptors for constructor 163 static int openInputFile(const std::string &filename); 164 static int openOutputFile(const std::string &filename); 165 166 // override of virtual SimObject method: register statistics 167 virtual void regStats(); 168 169 // After getting registered with system object, tell process which 170 // system-wide context id it is assigned. 171 void assignThreadContext(int context_id) 172 { 173 contextIds.push_back(context_id); 174 } 175 176 // Find a free context to use 177 ThreadContext *findFreeContext(); 178 179 // map simulator fd sim_fd to target fd tgt_fd 180 void dup_fd(int sim_fd, int tgt_fd); 181 182 // generate new target fd for sim_fd 183 int alloc_fd(int sim_fd, std::string filename, int flags, int mode, 184 bool pipe); 185 186 // free target fd (e.g., after close) 187 void free_fd(int tgt_fd); 188 189 // look up simulator fd for given target fd 190 int sim_fd(int tgt_fd); 191 192 // look up simulator fd_map object for a given target fd 193 FdMap *sim_fd_obj(int tgt_fd); 194 195 // fix all offsets for currently open files and save them 196 void fix_file_offsets(); 197 198 // find all offsets for currently open files and save them 199 void find_file_offsets(); 200 201 // set the source of this read pipe for a checkpoint resume 202 void setReadPipeSource(int read_pipe_fd, int source_fd); 203 204 virtual void syscall(int64_t callnum, ThreadContext *tc) = 0; 205
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208 /// Attempt to fix up a fault at vaddr by allocating a page on the stack. 209 /// @return Whether the fault has been fixed. 210 bool fixupStackFault(Addr vaddr); 211 212 void serialize(std::ostream &os); 213 void unserialize(Checkpoint *cp, const std::string §ion); 214}; 215 216// 217// "Live" process with system calls redirected to host system 218// 219class ObjectFile; 220class LiveProcess : public Process 221{ 222 protected: 223 ObjectFile *objFile; 224 std::vector<std::string> argv; 225 std::vector<std::string> envp; 226 std::string cwd; 227 228 LiveProcess(LiveProcessParams *params, ObjectFile *objFile); 229 230 // Id of the owner of the process 231 uint64_t __uid; 232 uint64_t __euid; 233 uint64_t __gid; 234 uint64_t __egid; 235 236 // pid of the process and it's parent 237 uint64_t __pid; 238 uint64_t __ppid; 239 240 public: 241 242 enum AuxiliaryVectorType { 243 M5_AT_NULL = 0, 244 M5_AT_IGNORE = 1, 245 M5_AT_EXECFD = 2, 246 M5_AT_PHDR = 3, 247 M5_AT_PHENT = 4, 248 M5_AT_PHNUM = 5, 249 M5_AT_PAGESZ = 6, 250 M5_AT_BASE = 7, 251 M5_AT_FLAGS = 8, 252 M5_AT_ENTRY = 9, 253 M5_AT_NOTELF = 10, 254 M5_AT_UID = 11, 255 M5_AT_EUID = 12, 256 M5_AT_GID = 13, 257 M5_AT_EGID = 14, 258 // The following may be specific to Linux 259 M5_AT_PLATFORM = 15, 260 M5_AT_HWCAP = 16, 261 M5_AT_CLKTCK = 17, 262 263 M5_AT_SECURE = 23, 264 M5_BASE_PLATFORM = 24, 265 M5_AT_RANDOM = 25, 266 267 M5_AT_EXECFN = 31, 268 269 M5_AT_VECTOR_SIZE = 44 270 }; 271 272 inline uint64_t uid() {return __uid;} 273 inline uint64_t euid() {return __euid;} 274 inline uint64_t gid() {return __gid;} 275 inline uint64_t egid() {return __egid;} 276 inline uint64_t pid() {return __pid;} 277 inline uint64_t ppid() {return __ppid;} 278 279 std::string 280 fullPath(const std::string &filename) 281 { 282 if (filename[0] == '/' || cwd.empty()) 283 return filename; 284 285 std::string full = cwd; 286 287 if (cwd[cwd.size() - 1] != '/') 288 full += '/'; 289 290 return full + filename; 291 } 292 293 std::string getcwd() const { return cwd; } 294 295 virtual void syscall(int64_t callnum, ThreadContext *tc); 296 297 virtual TheISA::IntReg getSyscallArg(ThreadContext *tc, int &i) = 0; 298 virtual TheISA::IntReg getSyscallArg(ThreadContext *tc, int &i, int width); 299 virtual void setSyscallArg(ThreadContext *tc, 300 int i, TheISA::IntReg val) = 0; 301 virtual void setSyscallReturn(ThreadContext *tc, 302 SyscallReturn return_value) = 0; 303 304 virtual SyscallDesc *getDesc(int callnum) = 0; 305 306 // this function is used to create the LiveProcess object, since 307 // we can't tell which subclass of LiveProcess to use until we 308 // open and look at the object file. 309 static LiveProcess *create(LiveProcessParams *params); 310}; 311 312 313#endif // __PROCESS_HH__
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