fs_workload.cc

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/*
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 * not be construed as granting a license to any other intellectual
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#include "arch/arm/fs_workload.hh"
 
#include "arch/arm/faults.hh"
#include "base/loader/object_file.hh"
#include "base/loader/symtab.hh"
#include "cpu/thread_context.hh"
#include "dev/arm/gic_v2.hh"
#include "kern/system_events.hh"
#include "params/ArmFsWorkload.hh"
 
namespace gem5
{
 
namespace ArmISA
{
 
void
SkipFunc::returnFromFuncIn(ThreadContext *tc)
{
    PCState new_pc = tc->pcState().as<PCState>();
    if (inAArch64(tc)) {
        new_pc.set(tc->getReg(int_reg::X30));
    } else {
        new_pc.set(tc->getReg(ReturnAddressReg) & ~1ULL);
    }
 
    CheckerCPU *checker = tc->getCheckerCpuPtr();
    if (checker) {
        tc->pcStateNoRecord(new_pc);
    } else {
        tc->pcState(new_pc);
    }
}
 
FsWorkload::FsWorkload(const Params &p) : KernelWorkload(p)
{
    if (kernelObj) {
        kernelEntry = (kernelObj->entryPoint() & loadAddrMask()) +
            loadAddrOffset();
    }
 
    bootLoaders.reserve(p.boot_loader.size());
    for (const auto &bl : p.boot_loader) {
        std::unique_ptr<loader::ObjectFile> bl_obj;
        bl_obj.reset(loader::createObjectFile(bl));
 
        fatal_if(!bl_obj, "Could not read bootloader: %s", bl);
        bootLoaders.emplace_back(std::move(bl_obj));
    }
 
    bootldr = getBootLoader(kernelObj);
 
    fatal_if(!bootLoaders.empty() && !bootldr,
             "Can't find a matching boot loader / kernel combination!");
 
    if (bootldr)
        loader::debugSymbolTable.insert(*bootldr->symtab().globals());
}
 
void
FsWorkload::initState()
{
    KernelWorkload::initState();
 
    // Reset CP15?? What does that mean -- ali
 
    // FPEXC.EN = 0
 
    for (auto *tc: system->threads) {
        Reset().invoke(tc);
        tc->activate();
    }
 
    auto *arm_sys = dynamic_cast<ArmSystem *>(system);
 
    if (bootldr) {
        bool is_gic_v2 =
            arm_sys->getGIC()->supportsVersion(BaseGic::GicVersion::GIC_V2);
        bootldr->buildImage().write(system->physProxy);
 
        inform("Using bootloader at address %#x", bootldr->entryPoint());
 
        // The address of the boot loader so we know
        // where to branch to after the reset fault
        // All other values needed by the boot loader to know what to do
        fatal_if(!params().cpu_release_addr,
                 "cpu_release_addr must be set with bootloader");
 
        fatal_if(!arm_sys->params().gic_cpu_addr && is_gic_v2,
                 "gic_cpu_addr must be set with bootloader");
 
        for (auto *tc: arm_sys->threads) {
            tc->setReg(int_reg::R3, kernelEntry);
            if (is_gic_v2)
                tc->setReg(int_reg::R4, arm_sys->params().gic_cpu_addr);
            if (getArch() == loader::Arm)
                tc->setReg(int_reg::R5, params().cpu_release_addr);
        }
        inform("Using kernel entry physical address at %#x\n", kernelEntry);
    } else {
        // Set the initial PC to be at start of the kernel code
        if (!arm_sys->highestELIs64())
            arm_sys->threads[0]->pcState(kernelObj->entryPoint());
    }
}
 
loader::ObjectFile *
FsWorkload::getBootLoader(loader::ObjectFile *const obj)
{
    if (obj) {
        for (auto &bl : bootLoaders) {
            if (bl->getArch() == obj->getArch())
                return bl.get();
        }
    } else if (!bootLoaders.empty()) {
        return bootLoaders[0].get();
    }
 
    return nullptr;
}
 
} // namespace ArmISA
} // namespace gem5