diff options
Diffstat (limited to 'sim/process.cc')
| -rw-r--r-- | sim/process.cc | 403 |
1 files changed, 403 insertions, 0 deletions
diff --git a/sim/process.cc b/sim/process.cc new file mode 100644 index 000000000..bb4333896 --- /dev/null +++ b/sim/process.cc @@ -0,0 +1,403 @@ +/* + * 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 <cstdio> +#include <string> + +#include "base/intmath.hh" +#include "base/loader/object_file.hh" +#include "base/statistics.hh" +#include "cpu/exec_context.hh" +#include "cpu/full_cpu/smt.hh" +#include "cpu/full_cpu/thread.hh" +#include "eio/eio.hh" +#include "mem/functional_mem/main_memory.hh" +#include "sim/builder.hh" +#include "sim/fake_syscall.hh" +#include "sim/process.hh" +#include "sim/sim_stats.hh" + +#ifdef TARGET_ALPHA +#include "arch/alpha/alpha_tru64_process.hh" +#include "arch/alpha/alpha_linux_process.hh" +#endif + +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 "process.cc not compatible with FULL_SYSTEM" +#endif + +// 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; + } + + 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; +} + + +int +Process::registerExecContext(ExecContext *xc) +{ + // add to list + int myIndex = execContexts.size(); + execContexts.push_back(xc); + + if (myIndex == 0) { + // first exec context for this process... initialize & enable + + // copy process's initial regs struct + xc->regs = *init_regs; + + // mark this context as active + xc->setStatus(ExecContext::Active); + } + + // return CPU number to caller and increment available CPU count + return myIndex; +} + + +void +Process::replaceExecContext(int xcIndex, ExecContext *xc) +{ + if (xcIndex >= execContexts.size()) { + panic("replaceExecContext: bad xcIndex, %d >= %d\n", + xcIndex, execContexts.size()); + } + + execContexts[xcIndex] = xc; +} + +// 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 +// +//////////////////////////////////////////////////////////////////////// + + +static void +copyStringArray(vector<string> &strings, Addr array_ptr, Addr data_ptr, + FunctionalMemory *memory) +{ + for (int i = 0; i < strings.size(); ++i) { + memory->access(Write, array_ptr, &data_ptr, sizeof(Addr)); + memory->writeString(data_ptr, strings[i].c_str()); + array_ptr += sizeof(Addr); + data_ptr += strings[i].size() + 1; + } + // add NULL terminator + data_ptr = 0; + memory->access(Write, array_ptr, &data_ptr, sizeof(Addr)); +} + +LiveProcess::LiveProcess(const string &name, ObjectFile *objFile, + int stdin_fd, int stdout_fd, int stderr_fd, + vector<string> &argv, vector<string> &envp) + : Process(name, stdin_fd, stdout_fd, stderr_fd) +{ + prog_fname = argv[0]; + + prog_entry = objFile->entryPoint(); + text_base = objFile->textBase(); + text_size = objFile->textSize(); + data_base = objFile->dataBase(); + data_size = objFile->dataSize() + objFile->bssSize(); + brk_point = RoundUp<uint64_t>(data_base + data_size, VMPageSize); + + // load object file into target memory + objFile->loadSections(memory); + + // Set up stack. On Alpha, stack goes below text section. This + // code should get moved to some architecture-specific spot. + stack_base = text_base - (409600+4096); + + // Set up region for mmaps. Tru64 seems to start just above 0 and + // grow up from there. + mmap_base = 0x10000; + + // Set pointer for next thread stack. Reserve 8M for main stack. + next_thread_stack_base = stack_base - (8 * 1024 * 1024); + + // Calculate how much space we need for arg & env arrays. + int argv_array_size = sizeof(Addr) * (argv.size() + 1); + int envp_array_size = sizeof(Addr) * (envp.size() + 1); + int arg_data_size = 0; + for (int i = 0; i < argv.size(); ++i) { + arg_data_size += argv[i].size() + 1; + } + int env_data_size = 0; + for (int i = 0; i < envp.size(); ++i) { + env_data_size += envp[i].size() + 1; + } + + int space_needed = + argv_array_size + envp_array_size + arg_data_size + env_data_size; + // for SimpleScalar compatibility + if (space_needed < 16384) + space_needed = 16384; + + // set bottom of stack + stack_min = stack_base - space_needed; + // align it + stack_min &= ~7; + stack_size = stack_base - stack_min; + + // map out initial stack contents + Addr argv_array_base = stack_min + sizeof(uint64_t); // room for argc + Addr envp_array_base = argv_array_base + argv_array_size; + Addr arg_data_base = envp_array_base + envp_array_size; + Addr env_data_base = arg_data_base + arg_data_size; + + // write contents to stack + uint64_t argc = argv.size(); + memory->access(Write, stack_min, &argc, sizeof(uint64_t)); + + copyStringArray(argv, argv_array_base, arg_data_base, memory); + copyStringArray(envp, envp_array_base, env_data_base, memory); + + init_regs->intRegFile[ArgumentReg0] = argc; + init_regs->intRegFile[ArgumentReg1] = argv_array_base; + init_regs->intRegFile[StackPointerReg] = stack_min; + init_regs->intRegFile[GlobalPointerReg] = objFile->globalPointer(); + init_regs->pc = prog_entry; + init_regs->npc = prog_entry + sizeof(MachInst); +} + + +LiveProcess * +LiveProcess::create(const string &name, + int stdin_fd, int stdout_fd, int stderr_fd, + vector<string> &argv, vector<string> &envp) +{ + LiveProcess *process = NULL; + ObjectFile *objFile = createObjectFile(argv[0]); + if (objFile == NULL) { + fatal("Can't load object file %s", argv[0]); + } + + // check object type & set up syscall emulation pointer + if (objFile->getArch() == ObjectFile::Alpha) { + switch (objFile->getOpSys()) { + case ObjectFile::Tru64: + process = new AlphaTru64Process(name, objFile, + stdin_fd, stdout_fd, stderr_fd, + argv, envp); + break; + + case ObjectFile::Linux: + process = new AlphaLinuxProcess(name, objFile, + stdin_fd, stdout_fd, stderr_fd, + argv, envp); + break; + + default: + fatal("Unknown/unsupported operating system."); + } + } else { + fatal("Unknown object file architecture."); + } + + delete objFile; + + if (process == NULL) + fatal("Unknown error creating process object."); + + return process; +} + + +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 = LiveProcess::create(getInstanceName(), + stdin_fd, stdout_fd, stderr_fd, + cmd, + env.isValid() ? env : null_vec); + + return temp; +} + + +REGISTER_SIM_OBJECT("LiveProcess", LiveProcess) |