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/*
* Copyright (c) 2004-2005 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 "arch/mips/process.hh"
#include "arch/mips/page_size.hh"
#include "arch/mips/regs/int.hh"
#include "base/loader/elf_object.hh"
#include "base/loader/object_file.hh"
#include "base/logging.hh"
#include "cpu/thread_context.hh"
#include "debug/Loader.hh"
#include "mem/page_table.hh"
#include "params/Process.hh"
#include "sim/aux_vector.hh"
#include "sim/byteswap.hh"
#include "sim/process.hh"
#include "sim/process_impl.hh"
#include "sim/syscall_return.hh"
#include "sim/system.hh"
namespace gem5
{
using namespace MipsISA;
MipsProcess::MipsProcess(const ProcessParams &params,
loader::ObjectFile *objFile)
: Process(params,
new EmulationPageTable(params.name, params.pid, PageBytes),
objFile)
{
fatal_if(params.useArchPT, "Arch page tables not implemented.");
// Set up stack. On MIPS, stack starts at the top of kuseg
// user address space. MIPS stack grows down from here
Addr stack_base = 0x7FFFFFFF;
Addr max_stack_size = 8 * 1024 * 1024;
// Set pointer for next thread stack. Reserve 8M for main stack.
Addr next_thread_stack_base = stack_base - max_stack_size;
// Set up break point (Top of Heap)
Addr brk_point = image.maxAddr();
brk_point = roundUp(brk_point, PageBytes);
// Set up region for mmaps. Start it 1GB above the top of the heap.
Addr mmap_end = brk_point + 0x40000000L;
memState = std::make_shared<MemState>(
this, brk_point, stack_base, max_stack_size,
next_thread_stack_base, mmap_end);
}
void
MipsProcess::initState()
{
Process::initState();
argsInit<uint32_t>(PageBytes);
}
template<class IntType>
void
MipsProcess::argsInit(int pageSize)
{
int intSize = sizeof(IntType);
std::vector<gem5::auxv::AuxVector<IntType>> auxv;
auto *elfObject = dynamic_cast<loader::ElfObject *>(objFile);
if (elfObject)
{
// Set the system page size
auxv.emplace_back(gem5::auxv::Pagesz, MipsISA::PageBytes);
// Set the frequency at which time() increments
auxv.emplace_back(gem5::auxv::Clktck, 100);
// For statically linked executables, this is the virtual
// address of the program header tables if they appear in the
// executable image.
auxv.emplace_back(gem5::auxv::Phdr, elfObject->programHeaderTable());
DPRINTF(Loader, "auxv at PHDR %08p\n",
elfObject->programHeaderTable());
// This is the size of a program header entry from the elf file.
auxv.emplace_back(gem5::auxv::Phent, elfObject->programHeaderSize());
// This is the number of program headers from the original elf file.
auxv.emplace_back(gem5::auxv::Phnum, elfObject->programHeaderCount());
// This is the base address of the ELF interpreter; it should be
// zero for static executables or contain the base address for
// dynamic executables.
auxv.emplace_back(gem5::auxv::Base, getBias());
//The entry point to the program
auxv.emplace_back(gem5::auxv::Entry, objFile->entryPoint());
//Different user and group IDs
auxv.emplace_back(gem5::auxv::Uid, uid());
auxv.emplace_back(gem5::auxv::Euid, euid());
auxv.emplace_back(gem5::auxv::Gid, gid());
auxv.emplace_back(gem5::auxv::Egid, egid());
auxv.emplace_back(gem5::auxv::Random, 0);
}
// Calculate how much space we need for arg & env & auxv arrays.
int argv_array_size = intSize * (argv.size() + 1);
int envp_array_size = intSize * (envp.size() + 1);
int auxv_array_size = intSize * 2 * (auxv.size() + 1);
int arg_data_size = 0;
for (std::vector<std::string>::size_type i = 0; i < argv.size(); ++i) {
arg_data_size += argv[i].size() + 1;
}
const int numRandomBytes = 16;
int aux_data_size = numRandomBytes;
int env_data_size = 0;
for (std::vector<std::string>::size_type i = 0; i < envp.size(); ++i) {
env_data_size += envp[i].size() + 1;
}
int space_needed =
argv_array_size +
envp_array_size +
auxv_array_size +
arg_data_size +
aux_data_size +
env_data_size;
// set bottom of stack
memState->setStackMin(memState->getStackBase() - space_needed);
// align it
memState->setStackMin(roundDown(memState->getStackMin(), pageSize));
memState->setStackSize(memState->getStackBase() - memState->getStackMin());
// map memory
memState->mapRegion(memState->getStackMin(),
roundUp(memState->getStackSize(), pageSize), "stack");
// map out initial stack contents; leave room for argc
IntType argv_array_base = memState->getStackMin() + intSize;
IntType envp_array_base = argv_array_base + argv_array_size;
IntType auxv_array_base = envp_array_base + envp_array_size;
IntType arg_data_base = auxv_array_base + auxv_array_size;
IntType aux_data_base = arg_data_base - arg_data_size;
IntType env_data_base = aux_data_base + aux_data_size;
// write contents to stack
IntType argc = argv.size();
argc = htole((IntType)argc);
initVirtMem->writeBlob(memState->getStackMin(), &argc, intSize);
copyStringArray(argv, argv_array_base, arg_data_base,
ByteOrder::little, *initVirtMem);
copyStringArray(envp, envp_array_base, env_data_base,
ByteOrder::little, *initVirtMem);
// Fix up the aux vectors which point to data.
for (auto &aux: auxv) {
if (aux.type == gem5::auxv::Random)
aux.val = aux_data_base;
}
// Copy the aux vector
Addr auxv_array_end = auxv_array_base;
for (const auto &aux: auxv) {
initVirtMem->write(auxv_array_end, aux, ByteOrder::little);
auxv_array_end += sizeof(aux);
}
// Write out the terminating zeroed auxilliary vector
const gem5::auxv::AuxVector<IntType> zero(0, 0);
initVirtMem->write(auxv_array_end, zero);
auxv_array_end += sizeof(zero);
ThreadContext *tc = system->threads[contextIds[0]];
tc->setReg(int_reg::A0, argc);
tc->setReg(int_reg::A1, argv_array_base);
tc->setReg(int_reg::Sp, memState->getStackMin());
tc->pcState(getStartPC());
}
} // namespace gem5