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Diffstat (limited to 'sim/prog.cc')
| -rw-r--r-- | sim/prog.cc | 281 |
1 files changed, 281 insertions, 0 deletions
diff --git a/sim/prog.cc b/sim/prog.cc new file mode 100644 index 000000000..8615cab68 --- /dev/null +++ b/sim/prog.cc @@ -0,0 +1,281 @@ +/* + * Copyright (c) 2003 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <unistd.h> +#include <fcntl.h> +#include <stdio.h> + +#include <string> + +#include "main_memory.hh" +#include "prog.hh" + +#include "eio.hh" +#include "thread.hh" +#include "fake_syscall.hh" +#include "loader.hh" +#include "exec_context.hh" +#include "smt.hh" + +#include "statistics.hh" +#include "sim_stats.hh" + +using namespace std; + +// +// The purpose of this code is to fake the loader & syscall mechanism +// when there's no OS: thus there's no resone to use it in FULL_SYSTEM +// mode when we do have an OS +// +#ifdef FULL_SYSTEM +#error "prog.cc not compatible with FULL_SYSTEM" +#endif + +// max allowable number of processes: should be no real cost to +// cranking this up if necessary +const int MAX_PROCESSES = 8; + +// current number of allocated processes +int num_processes = 0; + +Process::Process(const string &name, + int stdin_fd, // initial I/O descriptors + int stdout_fd, + int stderr_fd) + : SimObject(name) +{ + // allocate memory space + memory = new MainMemory(name + ".MainMem"); + + // allocate initial register file + init_regs = new RegFile; + + // initialize first 3 fds (stdin, stdout, stderr) + fd_map[STDIN_FILENO] = stdin_fd; + fd_map[STDOUT_FILENO] = stdout_fd; + fd_map[STDERR_FILENO] = stderr_fd; + + // mark remaining fds as free + for (int i = 3; i <= MAX_FD; ++i) { + fd_map[i] = -1; + } + + numCpus = 0; + + num_syscalls = 0; + + // other parameters will be initialized when the program is loaded +} + +void +Process::regStats() +{ + using namespace Statistics; + + num_syscalls + .name(name() + ".PROG:num_syscalls") + .desc("Number of system calls") + ; +} + +// +// static helper functions +// +int +Process::openInputFile(const string &filename) +{ + int fd = open(filename.c_str(), O_RDONLY); + + if (fd == -1) { + perror(NULL); + cerr << "unable to open \"" << filename << "\" for reading\n"; + fatal("can't open input file"); + } + + return fd; +} + + +int +Process::openOutputFile(const string &filename) +{ + int fd = open(filename.c_str(), O_WRONLY | O_CREAT | O_TRUNC, 0774); + + if (fd == -1) { + perror(NULL); + cerr << "unable to open \"" << filename << "\" for writing\n"; + fatal("can't open output file"); + } + + return fd; +} + + +void +Process::registerExecContext(ExecContext *ec) +{ + if (execContexts.empty()) { + // first exec context for this process... initialize & enable + + // copy process's initial regs struct + ec->regs = *init_regs; + + // mark this context as active + ec->setStatus(ExecContext::Active); + } + else { + ec->setStatus(ExecContext::Unallocated); + } + + // add to list + execContexts.push_back(ec); + + // increment available CPU count + ++numCpus; +} + + +// map simulator fd sim_fd to target fd tgt_fd +void +Process::dup_fd(int sim_fd, int tgt_fd) +{ + if (tgt_fd < 0 || tgt_fd > MAX_FD) + panic("Process::dup_fd tried to dup past MAX_FD (%d)", tgt_fd); + + fd_map[tgt_fd] = sim_fd; +} + + +// generate new target fd for sim_fd +int +Process::open_fd(int sim_fd) +{ + int free_fd; + + // in case open() returns an error, don't allocate a new fd + if (sim_fd == -1) + return -1; + + // find first free target fd + for (free_fd = 0; fd_map[free_fd] >= 0; ++free_fd) { + if (free_fd == MAX_FD) + panic("Process::open_fd: out of file descriptors!"); + } + + fd_map[free_fd] = sim_fd; + + return free_fd; +} + + +// look up simulator fd for given target fd +int +Process::sim_fd(int tgt_fd) +{ + if (tgt_fd > MAX_FD) + return -1; + + return fd_map[tgt_fd]; +} + + + +// +// need to declare these here since there is no concrete Process type +// that can be constructed (i.e., no REGISTER_SIM_OBJECT() macro call, +// which is where these get declared for concrete types). +// +DEFINE_SIM_OBJECT_CLASS_NAME("Process object", Process) + + +//////////////////////////////////////////////////////////////////////// +// +// LiveProcess member definitions +// +//////////////////////////////////////////////////////////////////////// + +LiveProcess::LiveProcess(const string &name, + int stdin_fd, int stdout_fd, int stderr_fd, + vector<string> &argv, vector<string> &envp) + : Process(name, stdin_fd, stdout_fd, stderr_fd) +{ + smt_load_prog(argv, envp, init_regs, this); +} + + +void +LiveProcess::syscall(ExecContext *xc) +{ + num_syscalls++; + + fake_syscall(this, xc); +} + + +BEGIN_DECLARE_SIM_OBJECT_PARAMS(LiveProcess) + + VectorParam<string> cmd; + Param<string> input; + Param<string> output; + VectorParam<string> env; + +END_DECLARE_SIM_OBJECT_PARAMS(LiveProcess) + + +BEGIN_INIT_SIM_OBJECT_PARAMS(LiveProcess) + + INIT_PARAM(cmd, "command line (executable plus arguments)"), + INIT_PARAM(input, "filename for stdin (dflt: use sim stdin)"), + INIT_PARAM(output, "filename for stdout/stderr (dflt: use sim stdout)"), + INIT_PARAM(env, "environment settings") + +END_INIT_SIM_OBJECT_PARAMS(LiveProcess) + + +CREATE_SIM_OBJECT(LiveProcess) +{ + // initialize file descriptors to default: same as simulator + int stdin_fd = input.isValid() ? Process::openInputFile(input) : 0; + int stdout_fd = output.isValid() ? Process::openOutputFile(output) : 1; + int stderr_fd = output.isValid() ? stdout_fd : 2; + + // dummy for default env + vector<string> null_vec; + + // We do this with "temp" because of the bogus compiler warning + // you get with g++ 2.95 -O if you just "return new LiveProcess(..." + LiveProcess *temp = new LiveProcess(getInstanceName(), + stdin_fd, stdout_fd, stderr_fd, + cmd, + env.isValid() ? env : null_vec); + + return temp; +} + + +REGISTER_SIM_OBJECT("LiveProcess", LiveProcess) |