faults.cc

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 * to a hardware implementation of the functionality of the software
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#include "sim/faults.hh"
 
#include <csignal>
 
#include "arch/generic/decoder.hh"
#include "base/logging.hh"
#include "cpu/base.hh"
#include "cpu/thread_context.hh"
#include "debug/Faults.hh"
#include "mem/page_table.hh"
#include "sim/full_system.hh"
#include "sim/process.hh"
 
namespace gem5
{
 
void
FaultBase::invoke(ThreadContext *tc, const StaticInstPtr &inst)
{
    panic_if(!FullSystem, "fault (%s) detected @ PC %s",
             name(), tc->pcState());
    DPRINTF(Faults, "Fault %s at PC: %s\n", name(), tc->pcState());
}
 
void
UnimpFault::invoke(ThreadContext *tc, const StaticInstPtr &inst)
{
    panic("Unimpfault: %s", panicStr.c_str());
}
 
void
SESyscallFault::invoke(ThreadContext *tc, const StaticInstPtr &inst)
{
    // Move the PC forward since that doesn't happen automatically.
    std::unique_ptr<PCStateBase> pc(tc->pcState().clone());
    inst->advancePC(*pc);
    tc->pcState(*pc);
 
    tc->getSystemPtr()->workload->syscall(tc);
}
 
void
ReExec::invoke(ThreadContext *tc, const StaticInstPtr &inst)
{
    tc->pcState(tc->pcState());
}
 
void
SyscallRetryFault::invoke(ThreadContext *tc, const StaticInstPtr &inst)
{
    tc->pcState(tc->pcState());
}
 
void
GenericPageTableFault::invoke(ThreadContext *tc, const StaticInstPtr &inst)
{
    bool handled = false;
    if (!FullSystem) {
        Process *p = tc->getProcessPtr();
        handled = p->fixupFault(vaddr);
    }
    panic_if(!handled &&
                 !tc->getSystemPtr()->trapToGdb(SIGSEGV, tc->contextId()),
             "Page table fault when accessing virtual address %#x\n", vaddr);
}
 
void
GenericAlignmentFault::invoke(ThreadContext *tc, const StaticInstPtr &inst)
{
    panic_if(!tc->getSystemPtr()->trapToGdb(SIGSEGV, tc->contextId()),
             "Alignment fault when accessing virtual address %#x\n", vaddr);
}
 
void GenericHtmFailureFault::invoke(ThreadContext *tc,
                                    const StaticInstPtr &inst)
{
    // reset decoder
    InstDecoder* dcdr = tc->getDecoderPtr();
    dcdr->reset();
 
    // restore transaction checkpoint
    const auto& checkpoint = tc->getHtmCheckpointPtr();
    assert(checkpoint);
    assert(checkpoint->valid());
 
    checkpoint->restore(tc, getHtmFailureFaultCause());
 
    // reset the global monitor
    tc->getIsaPtr()->globalClearExclusive();
 
    // send abort packet to ruby (in final breath)
    tc->htmAbortTransaction(htmUid, cause);
}
 
} // namespace gem5