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/*
* Copyright 2019 Google Inc.
*
* 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 "sim/kernel_workload.hh"
#include "debug/Loader.hh"
#include "params/KernelWorkload.hh"
#include "sim/system.hh"
KernelWorkload::KernelWorkload(const Params &p) : Workload(p),
_loadAddrMask(p.load_addr_mask), _loadAddrOffset(p.load_addr_offset),
commandLine(p.command_line)
{
if (params().object_file == "") {
inform("No kernel set for full system simulation. "
"Assuming you know what you're doing.");
} else {
kernelObj = Loader::createObjectFile(params().object_file);
inform("kernel located at: %s", params().object_file);
fatal_if(!kernelObj,
"Could not load kernel file %s", params().object_file);
image = kernelObj->buildImage();
_start = image.minAddr();
_end = image.maxAddr();
// If load_addr_mask is set to 0x0, then calculate the smallest mask to
// cover all kernel addresses so gem5 can relocate the kernel to a new
// offset.
if (_loadAddrMask == 0)
_loadAddrMask = mask(findMsbSet(_end - _start) + 1);
image.move([this](Addr a) {
return (a & _loadAddrMask) + _loadAddrOffset;
});
kernelSymtab = kernelObj->symtab();
Loader::debugSymbolTable.insert(kernelSymtab);
}
// Loading only needs to happen once and after memory system is
// connected so it will happen in initState()
std::vector<Addr> extras_addrs = p.extras_addrs;
if (extras_addrs.empty())
extras_addrs.resize(p.extras.size(), MaxAddr);
fatal_if(p.extras.size() != extras_addrs.size(),
"Additional kernel objects, not all load addresses specified\n");
for (int ker_idx = 0; ker_idx < p.extras.size(); ker_idx++) {
const std::string &obj_name = p.extras[ker_idx];
const bool raw = extras_addrs[ker_idx] != MaxAddr;
auto *obj = Loader::createObjectFile(obj_name, raw);
fatal_if(!obj, "Failed to build additional kernel object '%s'.\n",
obj_name);
extras.push_back(obj);
}
}
void
KernelWorkload::initState()
{
auto &phys_mem = system->physProxy;
/**
* Load the kernel code into memory.
*/
auto mapper = [this](Addr a) {
return (a & _loadAddrMask) + _loadAddrOffset;
};
if (params().object_file != "") {
if (params().addr_check) {
// Validate kernel mapping before loading binary
fatal_if(!system->isMemAddr(mapper(_start)) ||
!system->isMemAddr(mapper(_end)),
"Kernel is mapped to invalid location (not memory). "
"start (%#x) - end (%#x) %#x:%#x\n",
_start, _end, mapper(_start), mapper(_end));
}
// Load program sections into memory
image.write(phys_mem);
DPRINTF(Loader, "Kernel start = %#x\n", _start);
DPRINTF(Loader, "Kernel end = %#x\n", _end);
DPRINTF(Loader, "Kernel entry = %#x\n", kernelObj->entryPoint());
DPRINTF(Loader, "Kernel loaded...\n");
}
std::vector<Addr> extras_addrs = params().extras_addrs;
if (extras_addrs.empty())
extras_addrs.resize(params().extras.size(), MaxAddr);
for (int idx = 0; idx < extras.size(); idx++) {
const Addr load_addr = extras_addrs[idx];
auto image = extras[idx]->buildImage();
if (load_addr != MaxAddr)
image = image.offset(load_addr);
else
image = image.move(mapper);
image.write(phys_mem);
}
}
void
KernelWorkload::serialize(CheckpointOut &cp) const
{
kernelSymtab.serialize("symtab", cp);
}
void
KernelWorkload::unserialize(CheckpointIn &cp)
{
kernelSymtab.unserialize("symtab", cp);
}