se_workload.cc

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/*
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 *
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 * not be construed as granting a license to any other intellectual
 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
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 * terms below provided that you ensure that this notice is replicated
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 *
 * Copyright 2020 Google Inc.
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 * met: redistributions of source code must retain the above copyright
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#include "arch/x86/linux/se_workload.hh"
 
#include <sys/syscall.h>
 
#include "arch/x86/linux/linux.hh"
#include "arch/x86/page_size.hh"
#include "arch/x86/process.hh"
#include "arch/x86/regs/int.hh"
#include "arch/x86/regs/misc.hh"
#include "arch/x86/se_workload.hh"
#include "base/trace.hh"
#include "cpu/thread_context.hh"
#include "kern/linux/linux.hh"
#include "mem/se_translating_port_proxy.hh"
#include "sim/process.hh"
#include "sim/syscall_desc.hh"
#include "sim/syscall_emul.hh"
 
namespace gem5
{
 
namespace
{
 
class LinuxLoader : public Process::Loader
{
  public:
    Process *
    load(const ProcessParams &params, loader::ObjectFile *obj_file)
    {
        auto arch = obj_file->getArch();
        auto opsys = obj_file->getOpSys();
 
        if (arch != loader::X86_64 && arch != loader::I386)
            return nullptr;
 
        if (opsys == loader::UnknownOpSys) {
            warn("Unknown operating system; assuming Linux.");
            opsys = loader::Linux;
        }
 
        if (opsys != loader::Linux)
            return nullptr;
 
        if (arch == loader::X86_64)
            return new X86ISA::X86_64Process(params, obj_file);
        else
            return new X86ISA::I386Process(params, obj_file);
    }
};
 
LinuxLoader linuxLoader;
 
} // anonymous namespace
 
namespace X86ISA
{
 
EmuLinux::EmuLinux(const Params &p) : SEWorkload(p, PageShift)
{}
 
const std::vector<RegId> EmuLinux::SyscallABI64::ArgumentRegs = {
    int_reg::Rdi, int_reg::Rsi, int_reg::Rdx,
    int_reg::R10, int_reg::R8, int_reg::R9
};
 
const std::vector<RegId> EmuLinux::SyscallABI32::ArgumentRegs = {
    int_reg::Ebx, int_reg::Ecx, int_reg::Edx,
    int_reg::Esi, int_reg::Edi, int_reg::Ebp
};
 
void
EmuLinux::syscall(ThreadContext *tc)
{
    Process *process = tc->getProcessPtr();
    // Call the syscall function in the base Process class to update stats.
    // This will move into the base SEWorkload function at some point.
    process->Process::syscall(tc);
 
    RegVal rax = tc->getReg(int_reg::Rax);
    if (dynamic_cast<X86_64Process *>(process)) {
        syscallDescs64.get(rax)->doSyscall(tc);
    } else if (auto *proc32 = dynamic_cast<I386Process *>(process)) {
        PCState pc = tc->pcState().as<PCState>();
        Addr eip = pc.pc();
        const auto &vsyscall = proc32->getVSyscallPage();
        if (eip >= vsyscall.base && eip < vsyscall.base + vsyscall.size) {
            pc.set(vsyscall.base + vsyscall.vsysexitOffset);
            tc->pcState(pc);
        }
        syscallDescs32.get(rax)->doSyscall(tc);
    } else {
        panic("Unrecognized process type.");
    }
}
 
void
EmuLinux::event(ThreadContext *tc)
{
    Process *process = tc->getProcessPtr();
    Addr pc = tc->pcState().instAddr();
 
    if (process->kvmInSE) {
        Addr pc_page = mbits(pc, 63, 12);
        if (pc_page == syscallCodeVirtAddr) {
            syscall(tc);
            return;
        } else if (pc_page == PFHandlerVirtAddr) {
            pageFault(tc);
            return;
        }
    }
    warn("Unexpected workload event at pc %#x.", pc);
}
 
void
EmuLinux::pageFault(ThreadContext *tc)
{
    Process *p = tc->getProcessPtr();
    if (!p->fixupFault(tc->readMiscReg(misc_reg::Cr2))) {
        SETranslatingPortProxy proxy(tc);
        // at this point we should have 6 values on the interrupt stack
        int size = 6;
        size_t is_bytes = sizeof(uint64_t) * size;
        auto is = std::make_unique<uint64_t[]>(size);
        // reading the interrupt handler stack
        proxy.readBlob(ISTVirtAddr + PageBytes - is_bytes, is.get(), is_bytes);
        panic("Page fault at addr %#x\n\tInterrupt handler stack:\n"
                "\tss: %#x\n"
                "\trsp: %#x\n"
                "\trflags: %#x\n"
                "\tcs: %#x\n"
                "\trip: %#x\n"
                "\terr_code: %#x\n",
                tc->readMiscReg(misc_reg::Cr2),
                is[5], is[4], is[3], is[2], is[1], is[0]);
   }
}
 
} // namespace X86ISA
} // namespace gem5