1991ff3bb2
Change-Id: I9ff21092876593237f919e9f7fb7283bd865ba2e Reviewed-on: https://gem5-review.googlesource.com/2421 Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Maintainer: Brandon Potter <Brandon.Potter@amd.com>
648 lines
20 KiB
C++
648 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 <csignal>
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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/freebsd/process.hh"
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#include "arch/arm/linux/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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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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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 = nullptr;
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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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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 nullptr;
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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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Addr stack_min = memState->getStackMin();
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Addr stack_base = memState->getStackBase();
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Addr max_stack_size = memState->getMaxStackSize();
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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 >= stack_min && vaddr < stack_base) {
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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 < stack_min && vaddr >= stack_base - max_stack_size) {
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while (vaddr < stack_min) {
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stack_min -= TheISA::PageBytes;
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if (stack_base - stack_min > max_stack_size)
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fatal("Maximum stack size exceeded\n");
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allocateMem(stack_min, TheISA::PageBytes);
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inform("Increasing stack size by one page.");
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}
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memState->setStackMin(stack_min);
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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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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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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 == nullptr)
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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 nullptr;
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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 mmap_end = memState->getMmapEnd();
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Addr ld_bias = mmapGrowsDown() ? mmap_end - interp_mapsize : mmap_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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mmap_end = mmapGrowsDown() ? ld_bias : mmap_end + interp_mapsize;
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memState->setMmapEnd(mmap_end);
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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 = nullptr;
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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 == nullptr) {
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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()) {
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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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if (obj_file->getArch() == ObjectFile::SPARC64) {
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process = new Sparc64LinuxProcess(this, obj_file);
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} else {
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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 == nullptr)
|
|
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;
|
|
}
|