2367198921
Modifies the clone system call and adds execve system call. Requires allowing processes to steal thread contexts from other processes in the same system object and the ability to detach pieces of process state (such as MemState) to allow dynamic sharing.
650 lines
20 KiB
C++
650 lines
20 KiB
C++
/*
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* Copyright (c) 2014-2016 Advanced Micro Devices, Inc.
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* Copyright (c) 2012 ARM Limited
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* All rights reserved
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*
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* The license below extends only to copyright in the software and shall
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* not be construed as granting a license to any other intellectual
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* property including but not limited to intellectual property relating
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* to a hardware implementation of the functionality of the software
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* licensed hereunder. You may use the software subject to the license
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* terms below provided that you ensure that this notice is replicated
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* unmodified and in its entirety in all distributions of the software,
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* modified or unmodified, in source code or in binary form.
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*
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* Copyright (c) 2001-2005 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Nathan Binkert
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* Steve Reinhardt
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* Ali Saidi
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* Brandon Potter
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*/
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#include "sim/process.hh"
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#include <fcntl.h>
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#include <unistd.h>
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#include <array>
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#include <map>
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#include <string>
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#include <vector>
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#include "base/intmath.hh"
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#include "base/loader/object_file.hh"
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#include "base/loader/symtab.hh"
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#include "base/statistics.hh"
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#include "config/the_isa.hh"
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#include "cpu/thread_context.hh"
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#include "mem/page_table.hh"
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#include "mem/se_translating_port_proxy.hh"
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#include "params/Process.hh"
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#include "sim/emul_driver.hh"
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#include "sim/fd_array.hh"
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#include "sim/fd_entry.hh"
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#include "sim/syscall_desc.hh"
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#include "sim/system.hh"
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#if THE_ISA == ALPHA_ISA
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#include "arch/alpha/linux/process.hh"
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#elif THE_ISA == SPARC_ISA
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#include "arch/sparc/linux/process.hh"
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#include "arch/sparc/solaris/process.hh"
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#elif THE_ISA == MIPS_ISA
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#include "arch/mips/linux/process.hh"
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#elif THE_ISA == ARM_ISA
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#include "arch/arm/linux/process.hh"
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#include "arch/arm/freebsd/process.hh"
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#elif THE_ISA == X86_ISA
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#include "arch/x86/linux/process.hh"
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#elif THE_ISA == POWER_ISA
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#include "arch/power/linux/process.hh"
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#elif THE_ISA == RISCV_ISA
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#include "arch/riscv/linux/process.hh"
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#else
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#error "THE_ISA not set"
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#endif
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using namespace std;
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using namespace TheISA;
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Process::Process(ProcessParams * params, ObjectFile * obj_file)
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: SimObject(params), system(params->system),
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useArchPT(params->useArchPT),
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kvmInSE(params->kvmInSE),
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pTable(useArchPT ?
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static_cast<PageTableBase *>(new ArchPageTable(name(), params->pid,
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system)) :
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static_cast<PageTableBase *>(new FuncPageTable(name(), params->pid))),
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initVirtMem(system->getSystemPort(), this,
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SETranslatingPortProxy::Always),
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objFile(obj_file),
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argv(params->cmd), envp(params->env), cwd(params->cwd),
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executable(params->executable),
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_uid(params->uid), _euid(params->euid),
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_gid(params->gid), _egid(params->egid),
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_pid(params->pid), _ppid(params->ppid),
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_pgid(params->pgid), drivers(params->drivers),
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fds(make_shared<FDArray>(params->input, params->output, params->errout)),
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maxStackSize(params->maxStackSize),
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childClearTID(0)
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{
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if (_pid >= System::maxPID)
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fatal("_pid is too large: %d", _pid);
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auto ret_pair = system->PIDs.emplace(_pid);
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if (!ret_pair.second)
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fatal("_pid %d is already used", _pid);
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/**
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* Linux bundles together processes into this concept called a thread
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* group. The thread group is responsible for recording which processes
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* behave as threads within a process context. The thread group leader
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* is the process who's tgid is equal to its pid. Other processes which
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* belong to the thread group, but do not lead the thread group, are
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* treated as child threads. These threads are created by the clone system
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* call with options specified to create threads (differing from the
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* options used to implement a fork). By default, set up the tgid/pid
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* with a new, equivalent value. If CLONE_THREAD is specified, patch
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* the tgid value with the old process' value.
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*/
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_tgid = params->pid;
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exitGroup = new bool();
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memState = new MemState();
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sigchld = new bool();
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if (!debugSymbolTable) {
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debugSymbolTable = new SymbolTable();
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if (!objFile->loadGlobalSymbols(debugSymbolTable) ||
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!objFile->loadLocalSymbols(debugSymbolTable) ||
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!objFile->loadWeakSymbols(debugSymbolTable)) {
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delete debugSymbolTable;
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debugSymbolTable = NULL;
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}
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}
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}
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void
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Process::clone(ThreadContext *otc, ThreadContext *ntc,
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Process *np, TheISA::IntReg flags)
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{
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if (CLONE_VM & flags) {
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/**
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* Share the process memory address space between the new process
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* and the old process. Changes in one will be visible in the other
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* due to the pointer use.
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*/
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delete np->pTable;
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np->pTable = pTable;
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ntc->getMemProxy().setPageTable(np->pTable);
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delete np->memState;
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np->memState = memState;
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} else {
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/**
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* Duplicate the process memory address space. The state needs to be
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* copied over (rather than using pointers to share everything).
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*/
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typedef std::vector<pair<Addr,Addr>> MapVec;
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MapVec mappings;
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pTable->getMappings(&mappings);
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for (auto map : mappings) {
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Addr paddr, vaddr = map.first;
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bool alloc_page = !(np->pTable->translate(vaddr, paddr));
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np->replicatePage(vaddr, paddr, otc, ntc, alloc_page);
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}
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*np->memState = *memState;
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}
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if (CLONE_FILES & flags) {
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/**
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* The parent and child file descriptors are shared because the
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* two FDArray pointers are pointing to the same FDArray. Opening
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* and closing file descriptors will be visible to both processes.
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*/
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np->fds = fds;
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} else {
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/**
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* Copy the file descriptors from the old process into the new
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* child process. The file descriptors entry can be opened and
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* closed independently of the other process being considered. The
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* host file descriptors are also dup'd so that the flags for the
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* host file descriptor is independent of the other process.
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*/
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for (int tgt_fd = 0; tgt_fd < fds->getSize(); tgt_fd++) {
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std::shared_ptr<FDArray> nfds = np->fds;
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std::shared_ptr<FDEntry> this_fde = (*fds)[tgt_fd];
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if (!this_fde) {
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nfds->setFDEntry(tgt_fd, nullptr);
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continue;
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}
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nfds->setFDEntry(tgt_fd, this_fde->clone());
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auto this_hbfd = std::dynamic_pointer_cast<HBFDEntry>(this_fde);
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if (!this_hbfd)
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continue;
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int this_sim_fd = this_hbfd->getSimFD();
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if (this_sim_fd <= 2)
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continue;
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int np_sim_fd = dup(this_sim_fd);
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assert(np_sim_fd != -1);
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auto nhbfd = std::dynamic_pointer_cast<HBFDEntry>((*nfds)[tgt_fd]);
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nhbfd->setSimFD(np_sim_fd);
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}
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}
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if (CLONE_THREAD & flags) {
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np->_tgid = _tgid;
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delete np->exitGroup;
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np->exitGroup = exitGroup;
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}
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np->argv.insert(np->argv.end(), argv.begin(), argv.end());
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np->envp.insert(np->envp.end(), envp.begin(), envp.end());
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}
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void
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Process::regStats()
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{
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SimObject::regStats();
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using namespace Stats;
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numSyscalls
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.name(name() + ".numSyscalls")
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.desc("Number of system calls")
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;
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}
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ThreadContext *
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Process::findFreeContext()
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{
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for (auto &it : system->threadContexts) {
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if (ThreadContext::Halted == it->status())
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return it;
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}
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return NULL;
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}
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void
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Process::revokeThreadContext(int context_id)
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{
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std::vector<ContextID>::iterator it;
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for (it = contextIds.begin(); it != contextIds.end(); it++) {
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if (*it == context_id) {
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contextIds.erase(it);
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return;
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}
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}
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warn("Unable to find thread context to revoke");
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}
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void
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Process::initState()
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{
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if (contextIds.empty())
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fatal("Process %s is not associated with any HW contexts!\n", name());
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// first thread context for this process... initialize & enable
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ThreadContext *tc = system->getThreadContext(contextIds[0]);
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// mark this context as active so it will start ticking.
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tc->activate();
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pTable->initState(tc);
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}
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DrainState
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Process::drain()
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{
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fds->updateFileOffsets();
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return DrainState::Drained;
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}
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void
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Process::allocateMem(Addr vaddr, int64_t size, bool clobber)
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{
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int npages = divCeil(size, (int64_t)PageBytes);
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Addr paddr = system->allocPhysPages(npages);
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pTable->map(vaddr, paddr, size,
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clobber ? PageTableBase::Clobber : PageTableBase::Zero);
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}
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void
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Process::replicatePage(Addr vaddr, Addr new_paddr, ThreadContext *old_tc,
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ThreadContext *new_tc, bool allocate_page)
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{
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if (allocate_page)
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new_paddr = system->allocPhysPages(1);
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// Read from old physical page.
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uint8_t *buf_p = new uint8_t[PageBytes];
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old_tc->getMemProxy().readBlob(vaddr, buf_p, PageBytes);
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// Create new mapping in process address space by clobbering existing
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// mapping (if any existed) and then write to the new physical page.
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bool clobber = true;
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pTable->map(vaddr, new_paddr, PageBytes, clobber);
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new_tc->getMemProxy().writeBlob(vaddr, buf_p, PageBytes);
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delete[] buf_p;
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}
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bool
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Process::fixupStackFault(Addr vaddr)
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{
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// Check if this is already on the stack and there's just no page there
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// yet.
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if (vaddr >= memState->stackMin && vaddr < memState->stackBase) {
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allocateMem(roundDown(vaddr, PageBytes), PageBytes);
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return true;
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}
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// We've accessed the next page of the stack, so extend it to include
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// this address.
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if (vaddr < memState->stackMin
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&& vaddr >= memState->stackBase - maxStackSize) {
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while (vaddr < memState->stackMin) {
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memState->stackMin -= TheISA::PageBytes;
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if (memState->stackBase - memState->stackMin > maxStackSize)
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fatal("Maximum stack size exceeded\n");
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allocateMem(memState->stackMin, TheISA::PageBytes);
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inform("Increasing stack size by one page.");
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};
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return true;
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}
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return false;
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}
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void
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Process::serialize(CheckpointOut &cp) const
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{
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SERIALIZE_SCALAR(memState->brkPoint);
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SERIALIZE_SCALAR(memState->stackBase);
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SERIALIZE_SCALAR(memState->stackSize);
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SERIALIZE_SCALAR(memState->stackMin);
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SERIALIZE_SCALAR(memState->nextThreadStackBase);
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SERIALIZE_SCALAR(memState->mmapEnd);
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pTable->serialize(cp);
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/**
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* Checkpoints for file descriptors currently do not work. Need to
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* come back and fix them at a later date.
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*/
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warn("Checkpoints for file descriptors currently do not work.");
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#if 0
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for (int x = 0; x < fds->getSize(); x++)
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(*fds)[x].serializeSection(cp, csprintf("FDEntry%d", x));
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#endif
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}
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void
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Process::unserialize(CheckpointIn &cp)
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{
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UNSERIALIZE_SCALAR(memState->brkPoint);
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UNSERIALIZE_SCALAR(memState->stackBase);
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UNSERIALIZE_SCALAR(memState->stackSize);
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UNSERIALIZE_SCALAR(memState->stackMin);
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UNSERIALIZE_SCALAR(memState->nextThreadStackBase);
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UNSERIALIZE_SCALAR(memState->mmapEnd);
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pTable->unserialize(cp);
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/**
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* Checkpoints for file descriptors currently do not work. Need to
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* come back and fix them at a later date.
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*/
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warn("Checkpoints for file descriptors currently do not work.");
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#if 0
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for (int x = 0; x < fds->getSize(); x++)
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(*fds)[x]->unserializeSection(cp, csprintf("FDEntry%d", x));
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fds->restoreFileOffsets();
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#endif
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// The above returns a bool so that you could do something if you don't
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// find the param in the checkpoint if you wanted to, like set a default
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// but in this case we'll just stick with the instantiated value if not
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// found.
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}
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bool
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Process::map(Addr vaddr, Addr paddr, int size, bool cacheable)
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{
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pTable->map(vaddr, paddr, size,
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cacheable ? PageTableBase::Zero : PageTableBase::Uncacheable);
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return true;
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}
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void
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Process::syscall(int64_t callnum, ThreadContext *tc, Fault *fault)
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{
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numSyscalls++;
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SyscallDesc *desc = getDesc(callnum);
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if (desc == NULL)
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fatal("Syscall %d out of range", callnum);
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desc->doSyscall(callnum, this, tc, fault);
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}
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IntReg
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Process::getSyscallArg(ThreadContext *tc, int &i, int width)
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{
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return getSyscallArg(tc, i);
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}
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EmulatedDriver *
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Process::findDriver(std::string filename)
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{
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for (EmulatedDriver *d : drivers) {
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if (d->match(filename))
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return d;
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}
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return NULL;
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}
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void
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Process::updateBias()
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{
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ObjectFile *interp = objFile->getInterpreter();
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if (!interp || !interp->relocatable())
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return;
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// Determine how large the interpreters footprint will be in the process
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// address space.
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Addr interp_mapsize = roundUp(interp->mapSize(), TheISA::PageBytes);
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// We are allocating the memory area; set the bias to the lowest address
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// in the allocated memory region.
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Addr *end = &memState->mmapEnd;
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Addr ld_bias = mmapGrowsDown() ? *end - interp_mapsize : *end;
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// Adjust the process mmap area to give the interpreter room; the real
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// execve system call would just invoke the kernel's internal mmap
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// functions to make these adjustments.
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*end = mmapGrowsDown() ? ld_bias : *end + interp_mapsize;
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interp->updateBias(ld_bias);
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}
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ObjectFile *
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Process::getInterpreter()
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{
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return objFile->getInterpreter();
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}
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Addr
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Process::getBias()
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{
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ObjectFile *interp = getInterpreter();
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return interp ? interp->bias() : objFile->bias();
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}
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Addr
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Process::getStartPC()
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{
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ObjectFile *interp = getInterpreter();
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return interp ? interp->entryPoint() : objFile->entryPoint();
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}
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Process *
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ProcessParams::create()
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{
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Process *process = NULL;
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// If not specified, set the executable parameter equal to the
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// simulated system's zeroth command line parameter
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if (executable == "") {
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executable = cmd[0];
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}
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ObjectFile *obj_file = createObjectFile(executable);
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if (obj_file == NULL) {
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fatal("Can't load object file %s", executable);
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}
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#if THE_ISA == ALPHA_ISA
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if (obj_file->getArch() != ObjectFile::Alpha)
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fatal("Object file architecture does not match compiled ISA (Alpha).");
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switch (obj_file->getOpSys()) {
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case ObjectFile::UnknownOpSys:
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warn("Unknown operating system; assuming Linux.");
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// fall through
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case ObjectFile::Linux:
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process = new AlphaLinuxProcess(this, obj_file);
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break;
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default:
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fatal("Unknown/unsupported operating system.");
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}
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#elif THE_ISA == SPARC_ISA
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if (obj_file->getArch() != ObjectFile::SPARC64 &&
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obj_file->getArch() != ObjectFile::SPARC32)
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fatal("Object file architecture does not match compiled ISA (SPARC).");
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|
switch (obj_file->getOpSys()) {
|
|
case ObjectFile::UnknownOpSys:
|
|
warn("Unknown operating system; assuming Linux.");
|
|
// fall through
|
|
case ObjectFile::Linux:
|
|
if (obj_file->getArch() == ObjectFile::SPARC64) {
|
|
process = new Sparc64LinuxProcess(this, obj_file);
|
|
} else {
|
|
process = new Sparc32LinuxProcess(this, obj_file);
|
|
}
|
|
break;
|
|
|
|
case ObjectFile::Solaris:
|
|
process = new SparcSolarisProcess(this, obj_file);
|
|
break;
|
|
|
|
default:
|
|
fatal("Unknown/unsupported operating system.");
|
|
}
|
|
#elif THE_ISA == X86_ISA
|
|
if (obj_file->getArch() != ObjectFile::X86_64 &&
|
|
obj_file->getArch() != ObjectFile::I386)
|
|
fatal("Object file architecture does not match compiled ISA (x86).");
|
|
switch (obj_file->getOpSys()) {
|
|
case ObjectFile::UnknownOpSys:
|
|
warn("Unknown operating system; assuming Linux.");
|
|
// fall through
|
|
case ObjectFile::Linux:
|
|
if (obj_file->getArch() == ObjectFile::X86_64) {
|
|
process = new X86_64LinuxProcess(this, obj_file);
|
|
} else {
|
|
process = new I386LinuxProcess(this, obj_file);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
fatal("Unknown/unsupported operating system.");
|
|
}
|
|
#elif THE_ISA == MIPS_ISA
|
|
if (obj_file->getArch() != ObjectFile::Mips)
|
|
fatal("Object file architecture does not match compiled ISA (MIPS).");
|
|
switch (obj_file->getOpSys()) {
|
|
case ObjectFile::UnknownOpSys:
|
|
warn("Unknown operating system; assuming Linux.");
|
|
// fall through
|
|
case ObjectFile::Linux:
|
|
process = new MipsLinuxProcess(this, obj_file);
|
|
break;
|
|
|
|
default:
|
|
fatal("Unknown/unsupported operating system.");
|
|
}
|
|
#elif THE_ISA == ARM_ISA
|
|
ObjectFile::Arch arch = obj_file->getArch();
|
|
if (arch != ObjectFile::Arm && arch != ObjectFile::Thumb &&
|
|
arch != ObjectFile::Arm64)
|
|
fatal("Object file architecture does not match compiled ISA (ARM).");
|
|
switch (obj_file->getOpSys()) {
|
|
case ObjectFile::UnknownOpSys:
|
|
warn("Unknown operating system; assuming Linux.");
|
|
// fall through
|
|
case ObjectFile::Linux:
|
|
if (arch == ObjectFile::Arm64) {
|
|
process = new ArmLinuxProcess64(this, obj_file,
|
|
obj_file->getArch());
|
|
} else {
|
|
process = new ArmLinuxProcess32(this, obj_file,
|
|
obj_file->getArch());
|
|
}
|
|
break;
|
|
case ObjectFile::FreeBSD:
|
|
if (arch == ObjectFile::Arm64) {
|
|
process = new ArmFreebsdProcess64(this, obj_file,
|
|
obj_file->getArch());
|
|
} else {
|
|
process = new ArmFreebsdProcess32(this, obj_file,
|
|
obj_file->getArch());
|
|
}
|
|
break;
|
|
case ObjectFile::LinuxArmOABI:
|
|
fatal("M5 does not support ARM OABI binaries. Please recompile with an"
|
|
" EABI compiler.");
|
|
default:
|
|
fatal("Unknown/unsupported operating system.");
|
|
}
|
|
#elif THE_ISA == POWER_ISA
|
|
if (obj_file->getArch() != ObjectFile::Power)
|
|
fatal("Object file architecture does not match compiled ISA (Power).");
|
|
switch (obj_file->getOpSys()) {
|
|
case ObjectFile::UnknownOpSys:
|
|
warn("Unknown operating system; assuming Linux.");
|
|
// fall through
|
|
case ObjectFile::Linux:
|
|
process = new PowerLinuxProcess(this, obj_file);
|
|
break;
|
|
|
|
default:
|
|
fatal("Unknown/unsupported operating system.");
|
|
}
|
|
#elif THE_ISA == RISCV_ISA
|
|
if (obj_file->getArch() != ObjectFile::Riscv)
|
|
fatal("Object file architecture does not match compiled ISA (RISCV).");
|
|
switch (obj_file->getOpSys()) {
|
|
case ObjectFile::UnknownOpSys:
|
|
warn("Unknown operating system; assuming Linux.");
|
|
// fall through
|
|
case ObjectFile::Linux:
|
|
process = new RiscvLinuxProcess(this, obj_file);
|
|
break;
|
|
default:
|
|
fatal("Unknown/unsupported operating system.");
|
|
}
|
|
#else
|
|
#error "THE_ISA not set"
|
|
#endif
|
|
|
|
if (process == NULL)
|
|
fatal("Unknown error creating process object.");
|
|
return process;
|
|
}
|
|
|
|
std::string
|
|
Process::fullPath(const std::string &file_name)
|
|
{
|
|
if (file_name[0] == '/' || cwd.empty())
|
|
return file_name;
|
|
|
|
std::string full = cwd;
|
|
|
|
if (cwd[cwd.size() - 1] != '/')
|
|
full += '/';
|
|
|
|
return full + file_name;
|
|
}
|