process.cc revision 1158
1/* 2 * Copyright (c) 2001-2004 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 29#include <unistd.h> 30#include <fcntl.h> 31 32#include <cstdio> 33#include <string> 34 35#include "base/intmath.hh" 36#include "base/loader/object_file.hh" 37#include "base/loader/symtab.hh" 38#include "base/statistics.hh" 39#include "cpu/exec_context.hh" 40#include "cpu/full_cpu/smt.hh" 41#include "cpu/full_cpu/thread.hh" 42#include "eio/eio.hh" 43#include "mem/functional_mem/main_memory.hh" 44#include "sim/builder.hh" 45#include "sim/fake_syscall.hh" 46#include "sim/process.hh" 47#include "sim/stats.hh" 48 49#ifdef TARGET_ALPHA 50#include "arch/alpha/alpha_tru64_process.hh" 51#include "arch/alpha/alpha_linux_process.hh" 52#endif 53 54using namespace std; 55 56// 57// The purpose of this code is to fake the loader & syscall mechanism 58// when there's no OS: thus there's no resone to use it in FULL_SYSTEM 59// mode when we do have an OS 60// 61#ifdef FULL_SYSTEM 62#error "process.cc not compatible with FULL_SYSTEM" 63#endif 64 65// current number of allocated processes 66int num_processes = 0; 67 68Process::Process(const string &name, 69 int stdin_fd, // initial I/O descriptors 70 int stdout_fd, 71 int stderr_fd) 72 : SimObject(name) 73{ 74 // allocate memory space 75 memory = new MainMemory(name + ".MainMem"); 76 77 // allocate initial register file 78 init_regs = new RegFile; 79 memset(init_regs, 0, sizeof(RegFile)); 80 81 // initialize first 3 fds (stdin, stdout, stderr) 82 fd_map[STDIN_FILENO] = stdin_fd; 83 fd_map[STDOUT_FILENO] = stdout_fd; 84 fd_map[STDERR_FILENO] = stderr_fd; 85 86 // mark remaining fds as free 87 for (int i = 3; i <= MAX_FD; ++i) { 88 fd_map[i] = -1; 89 } 90 91 num_syscalls = 0; 92 93 // other parameters will be initialized when the program is loaded 94} 95 96void 97Process::regStats() 98{ 99 using namespace Stats; 100 101 num_syscalls 102 .name(name() + ".PROG:num_syscalls") 103 .desc("Number of system calls") 104 ; 105} 106 107// 108// static helper functions 109// 110int 111Process::openInputFile(const string &filename) 112{ 113 int fd = open(filename.c_str(), O_RDONLY); 114 115 if (fd == -1) { 116 perror(NULL); 117 cerr << "unable to open \"" << filename << "\" for reading\n"; 118 fatal("can't open input file"); 119 } 120 121 return fd; 122} 123 124 125int 126Process::openOutputFile(const string &filename) 127{ 128 int fd = open(filename.c_str(), O_WRONLY | O_CREAT | O_TRUNC, 0774); 129 130 if (fd == -1) { 131 perror(NULL); 132 cerr << "unable to open \"" << filename << "\" for writing\n"; 133 fatal("can't open output file"); 134 } 135 136 return fd; 137} 138 139 140int 141Process::registerExecContext(ExecContext *xc) 142{ 143 // add to list 144 int myIndex = execContexts.size(); 145 execContexts.push_back(xc); 146 147 if (myIndex == 0) { 148 // first exec context for this process... initialize & enable 149 150 // copy process's initial regs struct 151 xc->regs = *init_regs; 152 153 // mark this context as active. 154 // activate with zero delay so that we start ticking right 155 // away on cycle 0 156 xc->activate(0); 157 } 158 159 // return CPU number to caller and increment available CPU count 160 return myIndex; 161} 162 163 164void 165Process::replaceExecContext(ExecContext *xc, int xcIndex) 166{ 167 if (xcIndex >= execContexts.size()) { 168 panic("replaceExecContext: bad xcIndex, %d >= %d\n", 169 xcIndex, execContexts.size()); 170 } 171 172 execContexts[xcIndex] = xc; 173} 174 175// map simulator fd sim_fd to target fd tgt_fd 176void 177Process::dup_fd(int sim_fd, int tgt_fd) 178{ 179 if (tgt_fd < 0 || tgt_fd > MAX_FD) 180 panic("Process::dup_fd tried to dup past MAX_FD (%d)", tgt_fd); 181 182 fd_map[tgt_fd] = sim_fd; 183} 184 185 186// generate new target fd for sim_fd 187int 188Process::open_fd(int sim_fd) 189{ 190 int free_fd; 191 192 // in case open() returns an error, don't allocate a new fd 193 if (sim_fd == -1) 194 return -1; 195 196 // find first free target fd 197 for (free_fd = 0; fd_map[free_fd] >= 0; ++free_fd) { 198 if (free_fd == MAX_FD) 199 panic("Process::open_fd: out of file descriptors!"); 200 } 201 202 fd_map[free_fd] = sim_fd; 203 204 return free_fd; 205} 206 207 208// look up simulator fd for given target fd 209int 210Process::sim_fd(int tgt_fd) 211{ 212 if (tgt_fd > MAX_FD) 213 return -1; 214 215 return fd_map[tgt_fd]; 216} 217 218 219 220// 221// need to declare these here since there is no concrete Process type 222// that can be constructed (i.e., no REGISTER_SIM_OBJECT() macro call, 223// which is where these get declared for concrete types). 224// 225DEFINE_SIM_OBJECT_CLASS_NAME("Process", Process) 226 227 228//////////////////////////////////////////////////////////////////////// 229// 230// LiveProcess member definitions 231// 232//////////////////////////////////////////////////////////////////////// 233 234 235static void 236copyStringArray(vector<string> &strings, Addr array_ptr, Addr data_ptr, 237 FunctionalMemory *memory) 238{ 239 for (int i = 0; i < strings.size(); ++i) { 240 memory->access(Write, array_ptr, &data_ptr, sizeof(Addr)); 241 memory->writeString(data_ptr, strings[i].c_str()); 242 array_ptr += sizeof(Addr); 243 data_ptr += strings[i].size() + 1; 244 } 245 // add NULL terminator 246 data_ptr = 0; 247 memory->access(Write, array_ptr, &data_ptr, sizeof(Addr)); 248} 249 250LiveProcess::LiveProcess(const string &name, ObjectFile *objFile, 251 int stdin_fd, int stdout_fd, int stderr_fd, 252 vector<string> &argv, vector<string> &envp) 253 : Process(name, stdin_fd, stdout_fd, stderr_fd) 254{ 255 prog_fname = argv[0]; 256 257 prog_entry = objFile->entryPoint(); 258 text_base = objFile->textBase(); 259 text_size = objFile->textSize(); 260 data_base = objFile->dataBase(); 261 data_size = objFile->dataSize() + objFile->bssSize(); 262 brk_point = RoundUp<uint64_t>(data_base + data_size, VMPageSize); 263 264 // load object file into target memory 265 objFile->loadSections(memory); 266 267 // load up symbols, if any... these may be used for debugging or 268 // profiling. 269 if (!debugSymbolTable) { 270 debugSymbolTable = new SymbolTable(); 271 if (!objFile->loadGlobalSymbols(debugSymbolTable) || 272 !objFile->loadLocalSymbols(debugSymbolTable)) { 273 // didn't load any symbols 274 delete debugSymbolTable; 275 debugSymbolTable = NULL; 276 } 277 } 278 279 // Set up stack. On Alpha, stack goes below text section. This 280 // code should get moved to some architecture-specific spot. 281 stack_base = text_base - (409600+4096); 282 283 // Set up region for mmaps. Tru64 seems to start just above 0 and 284 // grow up from there. 285 mmap_base = 0x10000; 286 287 // Set pointer for next thread stack. Reserve 8M for main stack. 288 next_thread_stack_base = stack_base - (8 * 1024 * 1024); 289 290 // Calculate how much space we need for arg & env arrays. 291 int argv_array_size = sizeof(Addr) * (argv.size() + 1); 292 int envp_array_size = sizeof(Addr) * (envp.size() + 1); 293 int arg_data_size = 0; 294 for (int i = 0; i < argv.size(); ++i) { 295 arg_data_size += argv[i].size() + 1; 296 } 297 int env_data_size = 0; 298 for (int i = 0; i < envp.size(); ++i) { 299 env_data_size += envp[i].size() + 1; 300 } 301 302 int space_needed = 303 argv_array_size + envp_array_size + arg_data_size + env_data_size; 304 // for SimpleScalar compatibility 305 if (space_needed < 16384) 306 space_needed = 16384; 307 308 // set bottom of stack 309 stack_min = stack_base - space_needed; 310 // align it 311 stack_min &= ~7; 312 stack_size = stack_base - stack_min; 313 314 // map out initial stack contents 315 Addr argv_array_base = stack_min + sizeof(uint64_t); // room for argc 316 Addr envp_array_base = argv_array_base + argv_array_size; 317 Addr arg_data_base = envp_array_base + envp_array_size; 318 Addr env_data_base = arg_data_base + arg_data_size; 319 320 // write contents to stack 321 uint64_t argc = argv.size(); 322 memory->access(Write, stack_min, &argc, sizeof(uint64_t)); 323 324 copyStringArray(argv, argv_array_base, arg_data_base, memory); 325 copyStringArray(envp, envp_array_base, env_data_base, memory); 326 327 init_regs->intRegFile[ArgumentReg0] = argc; 328 init_regs->intRegFile[ArgumentReg1] = argv_array_base; 329 init_regs->intRegFile[StackPointerReg] = stack_min; 330 init_regs->intRegFile[GlobalPointerReg] = objFile->globalPointer(); 331 init_regs->pc = prog_entry; 332 init_regs->npc = prog_entry + sizeof(MachInst); 333} 334 335 336LiveProcess * 337LiveProcess::create(const string &name, 338 int stdin_fd, int stdout_fd, int stderr_fd, 339 vector<string> &argv, vector<string> &envp) 340{ 341 LiveProcess *process = NULL; 342 ObjectFile *objFile = createObjectFile(argv[0]); 343 if (objFile == NULL) { 344 fatal("Can't load object file %s", argv[0]); 345 } 346 347 // check object type & set up syscall emulation pointer 348 if (objFile->getArch() == ObjectFile::Alpha) { 349 switch (objFile->getOpSys()) { 350 case ObjectFile::Tru64: 351 process = new AlphaTru64Process(name, objFile, 352 stdin_fd, stdout_fd, stderr_fd, 353 argv, envp); 354 break; 355 356 case ObjectFile::Linux: 357 process = new AlphaLinuxProcess(name, objFile, 358 stdin_fd, stdout_fd, stderr_fd, 359 argv, envp); 360 break; 361 362 default: 363 fatal("Unknown/unsupported operating system."); 364 } 365 } else { 366 fatal("Unknown object file architecture."); 367 } 368 369 delete objFile; 370 371 if (process == NULL) 372 fatal("Unknown error creating process object."); 373 374 return process; 375} 376 377 378BEGIN_DECLARE_SIM_OBJECT_PARAMS(LiveProcess) 379 380 VectorParam<string> cmd; 381 Param<string> input; 382 Param<string> output; 383 VectorParam<string> env; 384 385END_DECLARE_SIM_OBJECT_PARAMS(LiveProcess) 386 387 388BEGIN_INIT_SIM_OBJECT_PARAMS(LiveProcess) 389 390 INIT_PARAM(cmd, "command line (executable plus arguments)"), 391 INIT_PARAM(input, "filename for stdin (dflt: use sim stdin)"), 392 INIT_PARAM(output, "filename for stdout/stderr (dflt: use sim stdout)"), 393 INIT_PARAM(env, "environment settings") 394 395END_INIT_SIM_OBJECT_PARAMS(LiveProcess) 396 397 398CREATE_SIM_OBJECT(LiveProcess) 399{ 400 // initialize file descriptors to default: same as simulator 401 int stdin_fd = input.isValid() ? Process::openInputFile(input) : 0; 402 int stdout_fd = output.isValid() ? Process::openOutputFile(output) : 1; 403 int stderr_fd = output.isValid() ? stdout_fd : 2; 404 405 // dummy for default env 406 vector<string> null_vec; 407 408 return LiveProcess::create(getInstanceName(), 409 stdin_fd, stdout_fd, stderr_fd, 410 cmd, 411 env.isValid() ? env : null_vec); 412} 413 414 415REGISTER_SIM_OBJECT("LiveProcess", LiveProcess) 416