remote_gdb.cc

M5,一个功能强大的多处理器系统模拟器.很多针对处理器架构,性能的研究都使用它作为模拟平台

/*
 * Copyright (c) 2002, 2003, 2004, 2005
 * The Regents of The University of Michigan
 * All Rights Reserved
 *
 * This code is part of the M5 simulator.
 *
 * Permission is granted to use, copy, create derivative works and
 * redistribute this software and such derivative works for any
 * purpose, so long as the copyright notice above, this grant of
 * permission, and the disclaimer below appear in all copies made; and
 * so long as the name of The University of Michigan is not used in
 * any advertising or publicity pertaining to the use or distribution
 * of this software without specific, written prior authorization.
 *
 * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION FROM THE
 * UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY PURPOSE, AND
 * WITHOUT WARRANTY BY THE UNIVERSITY OF MICHIGAN OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE. THE REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE
 * LIABLE FOR ANY DAMAGES, INCLUDING DIRECT, SPECIAL, INDIRECT,
 * INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM
 * ARISING OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
 * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGES.
 *
 * Authors: Nathan L. Binkert
 */

/*
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * All advertising materials mentioning features or use of this software
 * must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Lawrence Berkeley Laboratories.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
 *
 *	@(#)kgdb_stub.c	8.4 (Berkeley) 1/12/94
 */

/*-
 * Copyright (c) 2001 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the NetBSD
 *	Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

/*
 * $NetBSD: kgdb_stub.c,v 1.8 2001/07/07 22:58:00 wdk Exp $
 *
 * Taken from NetBSD
 *
 * "Stub" to allow remote cpu to debug over a serial line using gdb.
 */

#include <sys/signal.h>

#include <string>
#include <unistd.h>

#include "arch/vtophys.hh"
#include "arch/sparc/remote_gdb.hh"
#include "base/intmath.hh"
#include "base/remote_gdb.hh"
#include "base/socket.hh"
#include "base/trace.hh"
#include "config/full_system.hh"
#include "cpu/thread_context.hh"
#include "cpu/static_inst.hh"
#include "mem/page_table.hh"
#include "mem/physical.hh"
#include "mem/port.hh"
#include "sim/process.hh"
#include "sim/system.hh"

using namespace std;
using namespace TheISA;

RemoteGDB::RemoteGDB(System *_system, ThreadContext *c)
    : BaseRemoteGDB(_system, c, NumGDBRegs), nextBkpt(0)
{}

///////////////////////////////////////////////////////////
// RemoteGDB::acc
//
//	Determine if the mapping at va..(va+len) is valid.
//
bool
RemoteGDB::acc(Addr va, size_t len)
{
    //@Todo In NetBSD, this function checks if all addresses
    //from va to va + len have valid page map entries. Not
    //sure how this will work for other OSes or in general.
#if FULL_SYSTEM
    if (va)
        return true;
    return false;
#else
    TlbEntry entry;
    //Check to make sure the first byte is mapped into the processes address
    //space.
    if (context->getProcessPtr()->pTable->lookup(va, entry))
        return true;
    return false;
#endif
}

///////////////////////////////////////////////////////////
// RemoteGDB::getregs
//
//	Translate the kernel debugger register format into
//	the GDB register format.
void
RemoteGDB::getregs()
{
    memset(gdbregs.regs, 0, gdbregs.size);

    if (context->readMiscReg(MISCREG_PSTATE) &
           PSTATE::am) {
        uint32_t *regs;
        regs = (uint32_t*)gdbregs.regs;
        regs[Reg32Pc] = htobe((uint32_t)context->readPC());
        regs[Reg32Npc] = htobe((uint32_t)context->readNextPC());
        for(int x = RegG0; x <= RegI0 + 7; x++)
            regs[x] = htobe((uint32_t)context->readIntReg(x - RegG0));

        regs[Reg32Y] = htobe((uint32_t)context->readIntReg(NumIntArchRegs + 1));
        regs[Reg32Psr] = htobe((uint32_t)context->readMiscReg(MISCREG_PSTATE));
        regs[Reg32Fsr] = htobe((uint32_t)context->readMiscReg(MISCREG_FSR));
        regs[Reg32Csr] = htobe((uint32_t)context->readIntReg(NumIntArchRegs + 2));
    } else {
        gdbregs.regs[RegPc] = htobe(context->readPC());
        gdbregs.regs[RegNpc] = htobe(context->readNextPC());
        for(int x = RegG0; x <= RegI0 + 7; x++)
            gdbregs.regs[x] = htobe(context->readIntReg(x - RegG0));

        gdbregs.regs[RegFsr] = htobe(context->readMiscReg(MISCREG_FSR));
        gdbregs.regs[RegFprs] = htobe(context->readMiscReg(MISCREG_FPRS));
        gdbregs.regs[RegY] = htobe(context->readIntReg(NumIntArchRegs + 1));
        gdbregs.regs[RegState] = htobe(
            context->readMiscReg(MISCREG_CWP) |
            context->readMiscReg(MISCREG_PSTATE) << 8 |
            context->readMiscReg(MISCREG_ASI) << 24 |
            context->readIntReg(NumIntArchRegs + 2) << 32);
    }

    DPRINTF(GDBRead, "PC=%#x\n", gdbregs.regs[RegPc]);

    //Floating point registers are left at 0 in netbsd
    //All registers other than the pc, npc and int regs
    //are ignored as well.
}

///////////////////////////////////////////////////////////
// RemoteGDB::setregs
//
//	Translate the GDB register format into the kernel
//	debugger register format.
//
void
RemoteGDB::setregs()
{
    context->setPC(gdbregs.regs[RegPc]);
    context->setNextPC(gdbregs.regs[RegNpc]);
    for(int x = RegG0; x <= RegI0 + 7; x++)
        context->setIntReg(x - RegG0, gdbregs.regs[x]);
    //Only the integer registers, pc and npc are set in netbsd
}

void
RemoteGDB::clearSingleStep()
{
   if (nextBkpt)
       clearTempBreakpoint(nextBkpt);
}

void
RemoteGDB::setSingleStep()
{
    nextBkpt = context->readNextPC();
    setTempBreakpoint(nextBkpt);
}