xref: /gem5/src/sim/faults.cc

/*
 * Copyright (c) 2003-2005 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.
 *
 * Authors: Nathan Binkert
 *          Gabe Black
 */

#include "arch/isa_traits.hh"
#include "base/misc.hh"
#include "cpu/thread_context.hh"
#include "cpu/base.hh"
#include "sim/faults.hh"
#include "sim/process.hh"
#include "mem/page_table.hh"

#if !FULL_SYSTEM
void FaultBase::invoke(ThreadContext * tc)
{
    fatal("fault (%s) detected @ PC %p", name(), tc->readPC());
}
#else
void FaultBase::invoke(ThreadContext * tc)
{
    DPRINTF(Fault, "Fault %s at PC: %#x\n", name(), tc->readPC());
    tc->getCpuPtr()->recordEvent(csprintf("Fault %s", name()));

    assert(!tc->misspeculating());
}
#endif

void UnimpFault::invoke(ThreadContext * tc)
{
    panic("Unimpfault: %s\n", panicStr.c_str());
}

void PageTableFault::invoke(ThreadContext *tc)
{
    Process *p = tc->getProcessPtr();

    // We've accessed the next page of the stack, so extend the stack
    // to cover it.
    if(vaddr < p->stack_min && vaddr >= p->stack_min - TheISA::PageBytes)
    {
        p->stack_min -= TheISA::PageBytes;
        if(p->stack_base - p->stack_min > 8*1024*1024)
            fatal("Over max stack size for one thread\n");
        p->pTable->allocate(p->stack_min, TheISA::PageBytes);
        warn("Increasing stack size by one page.");
    }
    // Otherwise, we have an unexpected page fault. Report that fact,
    // and what address was accessed to cause the fault.
    else
    {
        panic("Page table fault when accessing virtual address %#x\n", vaddr);
    }
}