process.hh revision 10558:426665ec11a9
1/* 2 * Copyright (c) 2014 Advanced Micro Devices, Inc. 3 * Copyright (c) 2001-2005 The Regents of The University of Michigan 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are 8 * met: redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer; 10 * redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution; 13 * neither the name of the copyright holders nor the names of its 14 * contributors may be used to endorse or promote products derived from 15 * this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * Authors: Nathan Binkert 30 * Steve Reinhardt 31 */ 32 33#ifndef __PROCESS_HH__ 34#define __PROCESS_HH__ 35 36#include <string> 37#include <vector> 38 39#include "arch/registers.hh" 40#include "base/statistics.hh" 41#include "base/types.hh" 42#include "config/the_isa.hh" 43#include "mem/se_translating_port_proxy.hh" 44#include "sim/sim_object.hh" 45#include "sim/syscallreturn.hh" 46 47class PageTable; 48struct ProcessParams; 49struct LiveProcessParams; 50class SyscallDesc; 51class System; 52class ThreadContext; 53class EmulatedDriver; 54 55template<class IntType> 56struct AuxVector 57{ 58 IntType a_type; 59 IntType a_val; 60 61 AuxVector() 62 {} 63 64 AuxVector(IntType type, IntType val); 65}; 66 67class Process : public SimObject 68{ 69 public: 70 71 /// Pointer to object representing the system this process is 72 /// running on. 73 System *system; 74 75 // thread contexts associated with this process 76 std::vector<int> contextIds; 77 78 // number of CPUs (esxec contexts, really) assigned to this process. 79 unsigned int numCpus() { return contextIds.size(); } 80 81 // record of blocked context 82 struct WaitRec 83 { 84 Addr waitChan; 85 ThreadContext *waitingContext; 86 87 WaitRec(Addr chan, ThreadContext *ctx) 88 : waitChan(chan), waitingContext(ctx) 89 { } 90 }; 91 92 // list of all blocked contexts 93 std::list<WaitRec> waitList; 94 95 Addr brk_point; // top of the data segment 96 97 Addr stack_base; // stack segment base (highest address) 98 unsigned stack_size; // initial stack size 99 Addr stack_min; // lowest address accessed on the stack 100 101 // The maximum size allowed for the stack. 102 Addr max_stack_size; 103 104 // addr to use for next stack region (for multithreaded apps) 105 Addr next_thread_stack_base; 106 107 // Base of region for mmaps (when user doesn't specify an address). 108 Addr mmap_start; 109 Addr mmap_end; 110 111 // Base of region for nxm data 112 Addr nxm_start; 113 Addr nxm_end; 114 115 Stats::Scalar num_syscalls; // number of syscalls executed 116 117 protected: 118 // constructor 119 Process(ProcessParams *params); 120 121 virtual void initState(); 122 123 public: 124 125 //This id is assigned by m5 and is used to keep process' tlb entries 126 //separated. 127 uint64_t M5_pid; 128 129 // flag for using architecture specific page table 130 bool useArchPT; 131 // running KvmCPU in SE mode requires special initialization 132 bool kvmInSE; 133 134 PageTableBase* pTable; 135 136 class FdMap 137 { 138 public: 139 int fd; 140 std::string filename; 141 int mode; 142 int flags; 143 bool isPipe; 144 int readPipeSource; 145 uint64_t fileOffset; 146 EmulatedDriver *driver; 147 148 FdMap() 149 : fd(-1), filename("NULL"), mode(0), flags(0), 150 isPipe(false), readPipeSource(0), fileOffset(0), driver(NULL) 151 { } 152 153 void serialize(std::ostream &os); 154 void unserialize(Checkpoint *cp, const std::string §ion); 155 }; 156 157 protected: 158 /// Memory proxy for initialization (image loading) 159 SETranslatingPortProxy initVirtMem; 160 161 private: 162 // file descriptor remapping support 163 static const int MAX_FD = 256; // max legal fd value 164 FdMap fd_map[MAX_FD+1]; 165 166 167 public: 168 // static helper functions to generate file descriptors for constructor 169 static int openInputFile(const std::string &filename); 170 static int openOutputFile(const std::string &filename); 171 172 // override of virtual SimObject method: register statistics 173 virtual void regStats(); 174 175 // After getting registered with system object, tell process which 176 // system-wide context id it is assigned. 177 void assignThreadContext(int context_id) 178 { 179 contextIds.push_back(context_id); 180 } 181 182 // Find a free context to use 183 ThreadContext *findFreeContext(); 184 185 // provide program name for debug messages 186 virtual const char *progName() const { return "<unknown>"; } 187 188 // map simulator fd sim_fd to target fd tgt_fd 189 void dup_fd(int sim_fd, int tgt_fd); 190 191 // generate new target fd for sim_fd 192 int alloc_fd(int sim_fd, std::string filename, int flags, int mode, 193 bool pipe); 194 195 // free target fd (e.g., after close) 196 void free_fd(int tgt_fd); 197 198 // look up simulator fd for given target fd 199 int sim_fd(int tgt_fd); 200 201 // look up simulator fd_map object for a given target fd 202 FdMap *sim_fd_obj(int tgt_fd); 203 204 // fix all offsets for currently open files and save them 205 void fix_file_offsets(); 206 207 // find all offsets for currently open files and save them 208 void find_file_offsets(); 209 210 // set the source of this read pipe for a checkpoint resume 211 void setReadPipeSource(int read_pipe_fd, int source_fd); 212 213 virtual void syscall(int64_t callnum, ThreadContext *tc) = 0; 214 215 void allocateMem(Addr vaddr, int64_t size, bool clobber = false); 216 217 /// Attempt to fix up a fault at vaddr by allocating a page on the stack. 218 /// @return Whether the fault has been fixed. 219 bool fixupStackFault(Addr vaddr); 220 221 /** 222 * Maps a contiguous range of virtual addresses in this process's 223 * address space to a contiguous range of physical addresses. 224 * This function exists primarily to expose the map operation to 225 * python, so that configuration scripts can set up mappings in SE mode. 226 * 227 * @param vaddr The starting virtual address of the range. 228 * @param paddr The starting physical address of the range. 229 * @param size The length of the range in bytes. 230 * @param cacheable Specifies whether accesses are cacheable. 231 * @return True if the map operation was successful. (At this 232 * point in time, the map operation always succeeds.) 233 */ 234 bool map(Addr vaddr, Addr paddr, int size, bool cacheable = true); 235 236 void serialize(std::ostream &os); 237 void unserialize(Checkpoint *cp, const std::string §ion); 238}; 239 240// 241// "Live" process with system calls redirected to host system 242// 243class ObjectFile; 244class LiveProcess : public Process 245{ 246 protected: 247 ObjectFile *objFile; 248 std::vector<std::string> argv; 249 std::vector<std::string> envp; 250 std::string cwd; 251 252 LiveProcess(LiveProcessParams *params, ObjectFile *objFile); 253 254 // Id of the owner of the process 255 uint64_t __uid; 256 uint64_t __euid; 257 uint64_t __gid; 258 uint64_t __egid; 259 260 // pid of the process and it's parent 261 uint64_t __pid; 262 uint64_t __ppid; 263 264 // Emulated drivers available to this process 265 std::vector<EmulatedDriver *> drivers; 266 267 public: 268 269 enum AuxiliaryVectorType { 270 M5_AT_NULL = 0, 271 M5_AT_IGNORE = 1, 272 M5_AT_EXECFD = 2, 273 M5_AT_PHDR = 3, 274 M5_AT_PHENT = 4, 275 M5_AT_PHNUM = 5, 276 M5_AT_PAGESZ = 6, 277 M5_AT_BASE = 7, 278 M5_AT_FLAGS = 8, 279 M5_AT_ENTRY = 9, 280 M5_AT_NOTELF = 10, 281 M5_AT_UID = 11, 282 M5_AT_EUID = 12, 283 M5_AT_GID = 13, 284 M5_AT_EGID = 14, 285 // The following may be specific to Linux 286 M5_AT_PLATFORM = 15, 287 M5_AT_HWCAP = 16, 288 M5_AT_CLKTCK = 17, 289 290 M5_AT_SECURE = 23, 291 M5_BASE_PLATFORM = 24, 292 M5_AT_RANDOM = 25, 293 294 M5_AT_EXECFN = 31, 295 296 M5_AT_VECTOR_SIZE = 44 297 }; 298 299 inline uint64_t uid() {return __uid;} 300 inline uint64_t euid() {return __euid;} 301 inline uint64_t gid() {return __gid;} 302 inline uint64_t egid() {return __egid;} 303 inline uint64_t pid() {return __pid;} 304 inline uint64_t ppid() {return __ppid;} 305 306 // provide program name for debug messages 307 virtual const char *progName() const { return argv[0].c_str(); } 308 309 std::string 310 fullPath(const std::string &filename) 311 { 312 if (filename[0] == '/' || cwd.empty()) 313 return filename; 314 315 std::string full = cwd; 316 317 if (cwd[cwd.size() - 1] != '/') 318 full += '/'; 319 320 return full + filename; 321 } 322 323 std::string getcwd() const { return cwd; } 324 325 virtual void syscall(int64_t callnum, ThreadContext *tc); 326 327 virtual TheISA::IntReg getSyscallArg(ThreadContext *tc, int &i) = 0; 328 virtual TheISA::IntReg getSyscallArg(ThreadContext *tc, int &i, int width); 329 virtual void setSyscallArg(ThreadContext *tc, 330 int i, TheISA::IntReg val) = 0; 331 virtual void setSyscallReturn(ThreadContext *tc, 332 SyscallReturn return_value) = 0; 333 334 virtual SyscallDesc *getDesc(int callnum) = 0; 335 336 /** 337 * Find an emulated device driver. 338 * 339 * @param filename Name of the device (under /dev) 340 * @return Pointer to driver object if found, else NULL 341 */ 342 EmulatedDriver *findDriver(std::string filename); 343 344 // this function is used to create the LiveProcess object, since 345 // we can't tell which subclass of LiveProcess to use until we 346 // open and look at the object file. 347 static LiveProcess *create(LiveProcessParams *params); 348}; 349 350 351#endif // __PROCESS_HH__ 352