gem5/src/arch/alpha/remote_gdb.cc

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/*
* Copyright (c) 2002-2005 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
*/
/*
* 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 "config/full_system.hh"
#if FULL_SYSTEM
#include "arch/alpha/vtophys.hh"
#endif
#include "arch/alpha/kgdb.h"
#include "arch/alpha/utility.hh"
#include "arch/alpha/remote_gdb.hh"
#include "base/intmath.hh"
#include "base/remote_gdb.hh"
#include "base/socket.hh"
#include "base/trace.hh"
#include "cpu/thread_context.hh"
#include "cpu/static_inst.hh"
#include "mem/physical.hh"
#include "mem/port.hh"
#include "sim/system.hh"
using namespace std;
using namespace TheISA;
RemoteGDB::RemoteGDB(System *_system, ThreadContext *c)
: BaseRemoteGDB(_system, c, KGDB_NUMREGS)
{
memset(gdbregs.regs, 0, gdbregs.bytes());
}
///////////////////////////////////////////////////////////
// RemoteGDB::acc
//
// Determine if the mapping at va..(va+len) is valid.
//
bool
RemoteGDB::acc(Addr va, size_t len)
{
#if !FULL_SYSTEM
panic("acc function needs to be rewritten for SE mode\n");
#else
Addr last_va;
va = TheISA::TruncPage(va);
last_va = TheISA::RoundPage(va + len);
do {
if (TheISA::IsK0Seg(va)) {
if (va < (TheISA::K0SegBase + pmem->size())) {
DPRINTF(GDBAcc, "acc: Mapping is valid K0SEG <= "
"%#x < K0SEG + size\n", va);
return true;
} else {
DPRINTF(GDBAcc, "acc: Mapping invalid %#x > K0SEG + size\n",
va);
return false;
}
}
/**
* This code says that all accesses to palcode (instruction and data)
* are valid since there isn't a va->pa mapping because palcode is
* accessed physically. At some point this should probably be cleaned up
* but there is no easy way to do it.
*/
if (AlphaISA::PcPAL(va) || va < 0x10000)
return true;
Addr ptbr = context->readMiscRegNoEffect(AlphaISA::IPR_PALtemp20);
TheISA::PageTableEntry pte = TheISA::kernel_pte_lookup(context->getPhysPort(), ptbr, va);
if (!pte.valid()) {
DPRINTF(GDBAcc, "acc: %#x pte is invalid\n", va);
return false;
}
va += TheISA::PageBytes;
} while (va < last_va);
DPRINTF(GDBAcc, "acc: %#x mapping is valid\n", va);
return true;
#endif
}
///////////////////////////////////////////////////////////
// RemoteGDB::getregs
//
// Translate the kernel debugger register format into
// the GDB register format.
void
RemoteGDB::getregs()
{
memset(gdbregs.regs, 0, gdbregs.bytes());
gdbregs.regs[KGDB_REG_PC] = context->readPC();
// @todo: Currently this is very Alpha specific.
if (AlphaISA::PcPAL(gdbregs.regs[KGDB_REG_PC])) {
for (int i = 0; i < TheISA::NumIntArchRegs; ++i) {
gdbregs.regs[i] = context->readIntReg(AlphaISA::reg_redir[i]);
}
} else {
for (int i = 0; i < TheISA::NumIntArchRegs; ++i) {
gdbregs.regs[i] = context->readIntReg(i);
}
}
#ifdef KGDB_FP_REGS
for (int i = 0; i < TheISA::NumFloatArchRegs; ++i) {
gdbregs.regs[i + KGDB_REG_F0] = context->readFloatRegBits(i);
}
#endif
}
///////////////////////////////////////////////////////////
// RemoteGDB::setregs
//
// Translate the GDB register format into the kernel
// debugger register format.
//
void
RemoteGDB::setregs()
{
// @todo: Currently this is very Alpha specific.
if (AlphaISA::PcPAL(gdbregs.regs[KGDB_REG_PC])) {
for (int i = 0; i < TheISA::NumIntArchRegs; ++i) {
context->setIntReg(AlphaISA::reg_redir[i], gdbregs.regs[i]);
}
} else {
for (int i = 0; i < TheISA::NumIntArchRegs; ++i) {
context->setIntReg(i, gdbregs.regs[i]);
}
}
#ifdef KGDB_FP_REGS
for (int i = 0; i < TheISA::NumFloatArchRegs; ++i) {
context->setFloatRegBits(i, gdbregs.regs[i + KGDB_REG_F0]);
}
#endif
context->setPC(gdbregs.regs[KGDB_REG_PC]);
}
void
RemoteGDB::clearSingleStep()
{
DPRINTF(GDBMisc, "clearSingleStep bt_addr=%#x nt_addr=%#x\n",
takenBkpt, notTakenBkpt);
if (takenBkpt != 0)
clearTempBreakpoint(takenBkpt);
if (notTakenBkpt != 0)
clearTempBreakpoint(notTakenBkpt);
}
void
RemoteGDB::setSingleStep()
{
Addr pc = context->readPC();
Addr npc, bpc;
bool set_bt = false;
npc = pc + sizeof(MachInst);
// User was stopped at pc, e.g. the instruction at pc was not
// executed.
MachInst inst = read<MachInst>(pc);
StaticInstPtr si(inst, pc);
if (si->hasBranchTarget(pc, context, bpc)) {
// Don't bother setting a breakpoint on the taken branch if it
// is the same as the next pc
if (bpc != npc)
set_bt = true;
}
DPRINTF(GDBMisc, "setSingleStep bt_addr=%#x nt_addr=%#x\n",
takenBkpt, notTakenBkpt);
setTempBreakpoint(notTakenBkpt = npc);
if (set_bt)
setTempBreakpoint(takenBkpt = bpc);
}
// Write bytes to kernel address space for debugger.
bool
RemoteGDB::write(Addr vaddr, size_t size, const char *data)
{
if (BaseRemoteGDB::write(vaddr, size, data)) {
#ifdef IMB
alpha_pal_imb();
#endif
return true;
} else {
return false;
}
}