process.cc revision 2
1/* 2 * Copyright (c) 2003 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#include <stdio.h> 32 33#include <string> 34 35#include "main_memory.hh" 36#include "prog.hh" 37 38#include "eio.hh" 39#include "thread.hh" 40#include "fake_syscall.hh" 41#include "loader.hh" 42#include "exec_context.hh" 43#include "smt.hh" 44 45#include "statistics.hh" 46#include "sim_stats.hh" 47 48using namespace std; 49 50// 51// The purpose of this code is to fake the loader & syscall mechanism 52// when there's no OS: thus there's no resone to use it in FULL_SYSTEM 53// mode when we do have an OS 54// 55#ifdef FULL_SYSTEM 56#error "prog.cc not compatible with FULL_SYSTEM" 57#endif 58 59// max allowable number of processes: should be no real cost to 60// cranking this up if necessary 61const int MAX_PROCESSES = 8; 62 63// current number of allocated processes 64int num_processes = 0; 65 66Process::Process(const string &name, 67 int stdin_fd, // initial I/O descriptors 68 int stdout_fd, 69 int stderr_fd) 70 : SimObject(name) 71{ 72 // allocate memory space 73 memory = new MainMemory(name + ".MainMem"); 74 75 // allocate initial register file 76 init_regs = new RegFile; 77 78 // initialize first 3 fds (stdin, stdout, stderr) 79 fd_map[STDIN_FILENO] = stdin_fd; 80 fd_map[STDOUT_FILENO] = stdout_fd; 81 fd_map[STDERR_FILENO] = stderr_fd; 82 83 // mark remaining fds as free 84 for (int i = 3; i <= MAX_FD; ++i) { 85 fd_map[i] = -1; 86 } 87 88 numCpus = 0; 89 90 num_syscalls = 0; 91 92 // other parameters will be initialized when the program is loaded 93} 94 95void 96Process::regStats() 97{ 98 using namespace Statistics; 99 100 num_syscalls 101 .name(name() + ".PROG:num_syscalls") 102 .desc("Number of system calls") 103 ; 104} 105 106// 107// static helper functions 108// 109int 110Process::openInputFile(const string &filename) 111{ 112 int fd = open(filename.c_str(), O_RDONLY); 113 114 if (fd == -1) { 115 perror(NULL); 116 cerr << "unable to open \"" << filename << "\" for reading\n"; 117 fatal("can't open input file"); 118 } 119 120 return fd; 121} 122 123 124int 125Process::openOutputFile(const string &filename) 126{ 127 int fd = open(filename.c_str(), O_WRONLY | O_CREAT | O_TRUNC, 0774); 128 129 if (fd == -1) { 130 perror(NULL); 131 cerr << "unable to open \"" << filename << "\" for writing\n"; 132 fatal("can't open output file"); 133 } 134 135 return fd; 136} 137 138 139void 140Process::registerExecContext(ExecContext *ec) 141{ 142 if (execContexts.empty()) { 143 // first exec context for this process... initialize & enable 144 145 // copy process's initial regs struct 146 ec->regs = *init_regs; 147 148 // mark this context as active 149 ec->setStatus(ExecContext::Active); 150 } 151 else { 152 ec->setStatus(ExecContext::Unallocated); 153 } 154 155 // add to list 156 execContexts.push_back(ec); 157 158 // increment available CPU count 159 ++numCpus; 160} 161 162 163// map simulator fd sim_fd to target fd tgt_fd 164void 165Process::dup_fd(int sim_fd, int tgt_fd) 166{ 167 if (tgt_fd < 0 || tgt_fd > MAX_FD) 168 panic("Process::dup_fd tried to dup past MAX_FD (%d)", tgt_fd); 169 170 fd_map[tgt_fd] = sim_fd; 171} 172 173 174// generate new target fd for sim_fd 175int 176Process::open_fd(int sim_fd) 177{ 178 int free_fd; 179 180 // in case open() returns an error, don't allocate a new fd 181 if (sim_fd == -1) 182 return -1; 183 184 // find first free target fd 185 for (free_fd = 0; fd_map[free_fd] >= 0; ++free_fd) { 186 if (free_fd == MAX_FD) 187 panic("Process::open_fd: out of file descriptors!"); 188 } 189 190 fd_map[free_fd] = sim_fd; 191 192 return free_fd; 193} 194 195 196// look up simulator fd for given target fd 197int 198Process::sim_fd(int tgt_fd) 199{ 200 if (tgt_fd > MAX_FD) 201 return -1; 202 203 return fd_map[tgt_fd]; 204} 205 206 207 208// 209// need to declare these here since there is no concrete Process type 210// that can be constructed (i.e., no REGISTER_SIM_OBJECT() macro call, 211// which is where these get declared for concrete types). 212// 213DEFINE_SIM_OBJECT_CLASS_NAME("Process object", Process) 214 215 216//////////////////////////////////////////////////////////////////////// 217// 218// LiveProcess member definitions 219// 220//////////////////////////////////////////////////////////////////////// 221 222LiveProcess::LiveProcess(const string &name, 223 int stdin_fd, int stdout_fd, int stderr_fd, 224 vector<string> &argv, vector<string> &envp) 225 : Process(name, stdin_fd, stdout_fd, stderr_fd) 226{ 227 smt_load_prog(argv, envp, init_regs, this); 228} 229 230 231void 232LiveProcess::syscall(ExecContext *xc) 233{ 234 num_syscalls++; 235 236 fake_syscall(this, xc); 237} 238 239 240BEGIN_DECLARE_SIM_OBJECT_PARAMS(LiveProcess) 241 242 VectorParam<string> cmd; 243 Param<string> input; 244 Param<string> output; 245 VectorParam<string> env; 246 247END_DECLARE_SIM_OBJECT_PARAMS(LiveProcess) 248 249 250BEGIN_INIT_SIM_OBJECT_PARAMS(LiveProcess) 251 252 INIT_PARAM(cmd, "command line (executable plus arguments)"), 253 INIT_PARAM(input, "filename for stdin (dflt: use sim stdin)"), 254 INIT_PARAM(output, "filename for stdout/stderr (dflt: use sim stdout)"), 255 INIT_PARAM(env, "environment settings") 256 257END_INIT_SIM_OBJECT_PARAMS(LiveProcess) 258 259 260CREATE_SIM_OBJECT(LiveProcess) 261{ 262 // initialize file descriptors to default: same as simulator 263 int stdin_fd = input.isValid() ? Process::openInputFile(input) : 0; 264 int stdout_fd = output.isValid() ? Process::openOutputFile(output) : 1; 265 int stderr_fd = output.isValid() ? stdout_fd : 2; 266 267 // dummy for default env 268 vector<string> null_vec; 269 270 // We do this with "temp" because of the bogus compiler warning 271 // you get with g++ 2.95 -O if you just "return new LiveProcess(..." 272 LiveProcess *temp = new LiveProcess(getInstanceName(), 273 stdin_fd, stdout_fd, stderr_fd, 274 cmd, 275 env.isValid() ? env : null_vec); 276 277 return temp; 278} 279 280 281REGISTER_SIM_OBJECT("LiveProcess", LiveProcess) 282