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Diffstat (limited to 'src/sim/process.cc')
| -rw-r--r-- | src/sim/process.cc | 361 |
1 files changed, 361 insertions, 0 deletions
diff --git a/src/sim/process.cc b/src/sim/process.cc new file mode 100644 index 000000000..1261b8436 --- /dev/null +++ b/src/sim/process.cc @@ -0,0 +1,361 @@ +/* + * Copyright (c) 2001-2005 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 <string> + +#include "base/intmath.hh" +#include "base/loader/object_file.hh" +#include "base/loader/symtab.hh" +#include "base/statistics.hh" +#include "config/full_system.hh" +#include "cpu/exec_context.hh" +#include "mem/page_table.hh" +#include "mem/physical.hh" +#include "mem/translating_port.hh" +#include "sim/builder.hh" +#include "sim/process.hh" +#include "sim/stats.hh" +#include "sim/syscall_emul.hh" +#include "sim/system.hh" + +using namespace std; +using namespace TheISA; + +// +// 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 +// +#if FULL_SYSTEM +#error "process.cc not compatible with FULL_SYSTEM" +#endif + +// current number of allocated processes +int num_processes = 0; + +Process::Process(const string &nm, + System *_system, + int stdin_fd, // initial I/O descriptors + int stdout_fd, + int stderr_fd) + : SimObject(nm), system(_system) +{ + // 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; + } + + mmap_start = mmap_end = 0; + nxm_start = nxm_end = 0; + pTable = new PageTable(system); + // other parameters will be initialized when the program is loaded +} + + +void +Process::regStats() +{ + using namespace Stats; + + 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); + + // return CPU number to caller + return myIndex; +} + +void +Process::startup() +{ + if (execContexts.empty()) + fatal("Process %s is not associated with any CPUs!\n", name()); + + // first exec context for this process... initialize & enable + ExecContext *xc = execContexts[0]; + + // mark this context as active so it will start ticking. + xc->activate(0); + + Port *mem_port; + mem_port = system->physmem->getPort("functional"); + initVirtMem = new TranslatingPort(pTable, true); + mem_port->setPeer(initVirtMem); + initVirtMem->setPeer(mem_port); +} + +void +Process::replaceExecContext(ExecContext *xc, int xcIndex) +{ + 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::alloc_fd(int sim_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 (int free_fd = 0; free_fd < MAX_FD; ++free_fd) { + if (fd_map[free_fd] == -1) { + fd_map[free_fd] = sim_fd; + return free_fd; + } + } + + panic("Process::alloc_fd: out of file descriptors!"); +} + + +// free target fd (e.g., after close) +void +Process::free_fd(int tgt_fd) +{ + if (fd_map[tgt_fd] == -1) + warn("Process::free_fd: request to free unused fd %d", tgt_fd); + + fd_map[tgt_fd] = -1; +} + + +// 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", Process) + + +//////////////////////////////////////////////////////////////////////// +// +// LiveProcess member definitions +// +//////////////////////////////////////////////////////////////////////// + + +void +copyStringArray(vector<string> &strings, Addr array_ptr, Addr data_ptr, + TranslatingPort* memPort) +{ + Addr data_ptr_swap; + for (int i = 0; i < strings.size(); ++i) { + data_ptr_swap = htog(data_ptr); + memPort->writeBlob(array_ptr, (uint8_t*)&data_ptr_swap, sizeof(Addr)); + memPort->writeString(data_ptr, strings[i].c_str()); + array_ptr += sizeof(Addr); + data_ptr += strings[i].size() + 1; + } + // add NULL terminator + data_ptr = 0; + + memPort->writeBlob(array_ptr, (uint8_t*)&data_ptr, sizeof(Addr)); +} + +LiveProcess::LiveProcess(const string &nm, ObjectFile *_objFile, + System *_system, + int stdin_fd, int stdout_fd, int stderr_fd, + vector<string> &_argv, vector<string> &_envp) + : Process(nm, _system, stdin_fd, stdout_fd, stderr_fd), + objFile(_objFile), argv(_argv), envp(_envp) +{ + prog_fname = argv[0]; + + // load up symbols, if any... these may be used for debugging or + // profiling. + if (!debugSymbolTable) { + debugSymbolTable = new SymbolTable(); + if (!objFile->loadGlobalSymbols(debugSymbolTable) || + !objFile->loadLocalSymbols(debugSymbolTable)) { + // didn't load any symbols + delete debugSymbolTable; + debugSymbolTable = NULL; + } + } +} + +void +LiveProcess::argsInit(int intSize, int pageSize) +{ + Process::startup(); + + // load object file into target memory + objFile->loadSections(initVirtMem); + + // Calculate how much space we need for arg & env arrays. + int argv_array_size = intSize * (argv.size() + 1); + int envp_array_size = intSize * (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 &= ~(intSize-1); + stack_size = stack_base - stack_min; + // map memory + pTable->allocate(roundDown(stack_min, pageSize), + roundUp(stack_size, pageSize)); + + // map out initial stack contents + Addr argv_array_base = stack_min + intSize; // 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(); + if (intSize == 8) + argc = htog((uint64_t)argc); + else if (intSize == 4) + argc = htog((uint32_t)argc); + else + panic("Unknown int size"); + + initVirtMem->writeBlob(stack_min, (uint8_t*)&argc, intSize); + + copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem); + copyStringArray(envp, envp_array_base, env_data_base, initVirtMem); + + execContexts[0]->setIntReg(ArgumentReg0, argc); + execContexts[0]->setIntReg(ArgumentReg1, argv_array_base); + execContexts[0]->setIntReg(StackPointerReg, stack_min); + + Addr prog_entry = objFile->entryPoint(); + execContexts[0]->setPC(prog_entry); + execContexts[0]->setNextPC(prog_entry + sizeof(MachInst)); + execContexts[0]->setNextNPC(prog_entry + (2 * sizeof(MachInst))); + + num_processes++; +} + +void +LiveProcess::syscall(int64_t callnum, ExecContext *xc) +{ + num_syscalls++; + + SyscallDesc *desc = getDesc(callnum); + if (desc == NULL) + fatal("Syscall %d out of range", callnum); + + desc->doSyscall(callnum, this, xc); +} + +DEFINE_SIM_OBJECT_CLASS_NAME("LiveProcess", LiveProcess); |