from #ifdef DEBUG to #ifndef NDEBUG base/remote_gdb.cc: make the remote debugger gdb stuff work in m5.opt sim/system.cc: sim/system.hh: make the console panic break event happen in m5.opt --HG-- extra : convert_revision : 044a9b7cdacb058112388a31315e45c5d8cf70fd
1208 lines
31 KiB
C++
1208 lines
31 KiB
C++
/*
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* Copyright (c) 2002-2005 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
|
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Lawrence Berkeley Laboratories.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
|
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kgdb_stub.c 8.4 (Berkeley) 1/12/94
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*/
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/*-
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* Copyright (c) 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
|
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* $NetBSD: kgdb_stub.c,v 1.8 2001/07/07 22:58:00 wdk Exp $
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*
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* Taken from NetBSD
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*
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* "Stub" to allow remote cpu to debug over a serial line using gdb.
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*/
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#include <sys/signal.h>
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#include <cstdio>
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#include <string>
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#include <unistd.h>
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#include "base/intmath.hh"
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#include "base/kgdb.h"
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#include "base/remote_gdb.hh"
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#include "base/socket.hh"
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#include "base/trace.hh"
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#include "cpu/exec_context.hh"
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#include "cpu/static_inst.hh"
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#include "mem/functional/physical.hh"
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#include "sim/system.hh"
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#include "targetarch/vtophys.hh"
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using namespace std;
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#ifndef NDEBUG
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vector<RemoteGDB *> debuggers;
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int current_debugger = -1;
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void
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debugger()
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{
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if (current_debugger >= 0 && current_debugger < debuggers.size()) {
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RemoteGDB *gdb = debuggers[current_debugger];
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if (!gdb->isattached())
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gdb->listener->accept();
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if (gdb->isattached())
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gdb->trap(ALPHA_KENTRY_IF);
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}
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}
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#endif
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///////////////////////////////////////////////////////////
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//
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//
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//
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GDBListener::Event::Event(GDBListener *l, int fd, int e)
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: PollEvent(fd, e), listener(l)
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{}
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void
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GDBListener::Event::process(int revent)
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{
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listener->accept();
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}
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GDBListener::GDBListener(RemoteGDB *g, int p)
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: event(NULL), gdb(g), port(p)
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{
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assert(!gdb->listener);
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gdb->listener = this;
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}
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GDBListener::~GDBListener()
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{
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if (event)
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delete event;
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}
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string
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GDBListener::name()
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{
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return gdb->name() + ".listener";
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}
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void
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GDBListener::listen()
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{
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while (!listener.listen(port, true)) {
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DPRINTF(GDBMisc, "Can't bind port %d\n", port);
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port++;
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}
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event = new Event(this, listener.getfd(), POLLIN);
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pollQueue.schedule(event);
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#ifndef NDEBUG
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gdb->number = debuggers.size();
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debuggers.push_back(gdb);
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#endif
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#ifndef NDEBUG
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ccprintf(cerr, "%d: %s: listening for remote gdb #%d on port %d\n",
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curTick, name(), gdb->number, port);
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#else
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ccprintf(cerr, "%d: %s: listening for remote gdb on port %d\n",
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curTick, name(), port);
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#endif
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}
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void
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GDBListener::accept()
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{
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if (!listener.islistening())
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panic("GDBListener::accept(): cannot accept if we're not listening!");
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int sfd = listener.accept(true);
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if (sfd != -1) {
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if (gdb->isattached())
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close(sfd);
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else
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gdb->attach(sfd);
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}
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}
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///////////////////////////////////////////////////////////
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//
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//
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//
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int digit2i(char);
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char i2digit(int);
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void mem2hex(void *, const void *, int);
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const char *hex2mem(void *, const char *, int);
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Addr hex2i(const char **);
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RemoteGDB::Event::Event(RemoteGDB *g, int fd, int e)
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: PollEvent(fd, e), gdb(g)
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{}
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void
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RemoteGDB::Event::process(int revent)
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{
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if (revent & POLLIN)
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gdb->trap(ALPHA_KENTRY_IF);
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else if (revent & POLLNVAL)
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gdb->detach();
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}
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RemoteGDB::RemoteGDB(System *_system, ExecContext *c)
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: event(NULL), listener(NULL), number(-1), fd(-1),
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active(false), attached(false),
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system(_system), pmem(_system->physmem), context(c)
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{
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memset(gdbregs, 0, sizeof(gdbregs));
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}
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RemoteGDB::~RemoteGDB()
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{
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if (event)
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delete event;
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}
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string
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RemoteGDB::name()
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{
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return system->name() + ".remote_gdb";
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}
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bool
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RemoteGDB::isattached()
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{ return attached; }
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void
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RemoteGDB::attach(int f)
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{
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fd = f;
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event = new Event(this, fd, POLLIN);
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pollQueue.schedule(event);
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attached = true;
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DPRINTFN("remote gdb attached\n");
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}
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void
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RemoteGDB::detach()
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{
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attached = false;
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close(fd);
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fd = -1;
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pollQueue.remove(event);
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DPRINTFN("remote gdb detached\n");
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}
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const char *
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gdb_command(char cmd)
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{
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switch (cmd) {
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case KGDB_SIGNAL: return "KGDB_SIGNAL";
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case KGDB_SET_BAUD: return "KGDB_SET_BAUD";
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case KGDB_SET_BREAK: return "KGDB_SET_BREAK";
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case KGDB_CONT: return "KGDB_CONT";
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case KGDB_ASYNC_CONT: return "KGDB_ASYNC_CONT";
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case KGDB_DEBUG: return "KGDB_DEBUG";
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case KGDB_DETACH: return "KGDB_DETACH";
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case KGDB_REG_R: return "KGDB_REG_R";
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case KGDB_REG_W: return "KGDB_REG_W";
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case KGDB_SET_THREAD: return "KGDB_SET_THREAD";
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case KGDB_CYCLE_STEP: return "KGDB_CYCLE_STEP";
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case KGDB_SIG_CYCLE_STEP: return "KGDB_SIG_CYCLE_STEP";
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case KGDB_KILL: return "KGDB_KILL";
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case KGDB_MEM_W: return "KGDB_MEM_W";
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case KGDB_MEM_R: return "KGDB_MEM_R";
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case KGDB_SET_REG: return "KGDB_SET_REG";
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case KGDB_READ_REG: return "KGDB_READ_REG";
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case KGDB_QUERY_VAR: return "KGDB_QUERY_VAR";
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case KGDB_SET_VAR: return "KGDB_SET_VAR";
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case KGDB_RESET: return "KGDB_RESET";
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case KGDB_STEP: return "KGDB_STEP";
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case KGDB_ASYNC_STEP: return "KGDB_ASYNC_STEP";
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case KGDB_THREAD_ALIVE: return "KGDB_THREAD_ALIVE";
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case KGDB_TARGET_EXIT: return "KGDB_TARGET_EXIT";
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case KGDB_BINARY_DLOAD: return "KGDB_BINARY_DLOAD";
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case KGDB_CLR_HW_BKPT: return "KGDB_CLR_HW_BKPT";
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case KGDB_SET_HW_BKPT: return "KGDB_SET_HW_BKPT";
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case KGDB_START: return "KGDB_START";
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case KGDB_END: return "KGDB_END";
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case KGDB_GOODP: return "KGDB_GOODP";
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case KGDB_BADP: return "KGDB_BADP";
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default: return "KGDB_UNKNOWN";
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}
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}
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///////////////////////////////////////////////////////////
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// RemoteGDB::acc
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//
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// Determine if the mapping at va..(va+len) is valid.
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//
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bool
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RemoteGDB::acc(Addr va, size_t len)
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{
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Addr last_va;
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va = TheISA::TruncPage(va);
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last_va = TheISA::RoundPage(va + len);
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do {
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if (TheISA::IsK0Seg(va)) {
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if (va < (TheISA::K0SegBase + pmem->size())) {
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DPRINTF(GDBAcc, "acc: Mapping is valid K0SEG <= "
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"%#x < K0SEG + size\n", va);
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return true;
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} else {
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DPRINTF(GDBAcc, "acc: Mapping invalid %#x > K0SEG + size\n",
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va);
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return false;
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}
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}
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/**
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* This code says that all accesses to palcode (instruction and data)
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* are valid since there isn't a va->pa mapping because palcode is
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* accessed physically. At some point this should probably be cleaned up
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* but there is no easy way to do it.
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*/
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if (AlphaISA::PcPAL(va) || va < 0x10000)
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return true;
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Addr ptbr = context->regs.ipr[AlphaISA::IPR_PALtemp20];
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TheISA::PageTableEntry pte = kernel_pte_lookup(pmem, ptbr, va);
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if (!pte.valid()) {
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DPRINTF(GDBAcc, "acc: %#x pte is invalid\n", va);
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return false;
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}
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va += TheISA::PageBytes;
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} while (va < last_va);
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DPRINTF(GDBAcc, "acc: %#x mapping is valid\n", va);
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return true;
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}
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///////////////////////////////////////////////////////////
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// RemoteGDB::signal
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//
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// Translate a trap number into a Unix-compatible signal number.
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// (GDB only understands Unix signal numbers.)
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//
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int
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RemoteGDB::signal(int type)
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{
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switch (type) {
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case ALPHA_KENTRY_INT:
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return (SIGTRAP);
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case ALPHA_KENTRY_UNA:
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return (SIGBUS);
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case ALPHA_KENTRY_ARITH:
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return (SIGFPE);
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|
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case ALPHA_KENTRY_IF:
|
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return (SIGILL);
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|
|
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case ALPHA_KENTRY_MM:
|
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return (SIGSEGV);
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|
|
|
default:
|
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panic("unknown signal type");
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return 0;
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}
|
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}
|
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|
|
///////////////////////////////////////////////////////////
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// RemoteGDB::getregs
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|
//
|
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// Translate the kernel debugger register format into
|
|
// the GDB register format.
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|
void
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RemoteGDB::getregs()
|
|
{
|
|
memset(gdbregs, 0, sizeof(gdbregs));
|
|
memcpy(&gdbregs[KGDB_REG_V0], context->regs.intRegFile, 32 * sizeof(uint64_t));
|
|
#ifdef KGDB_FP_REGS
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|
memcpy(&gdbregs[KGDB_REG_F0], context->regs.floatRegFile.q,
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32 * sizeof(uint64_t));
|
|
#endif
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gdbregs[KGDB_REG_PC] = context->regs.pc;
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}
|
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|
|
///////////////////////////////////////////////////////////
|
|
// RemoteGDB::setregs
|
|
//
|
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// Translate the GDB register format into the kernel
|
|
// debugger register format.
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|
//
|
|
void
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|
RemoteGDB::setregs()
|
|
{
|
|
memcpy(context->regs.intRegFile, &gdbregs[KGDB_REG_V0],
|
|
32 * sizeof(uint64_t));
|
|
#ifdef KGDB_FP_REGS
|
|
memcpy(context->regs.floatRegFile.q, &gdbregs[KGDB_REG_F0],
|
|
32 * sizeof(uint64_t));
|
|
#endif
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context->regs.pc = gdbregs[KGDB_REG_PC];
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|
}
|
|
|
|
void
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|
RemoteGDB::setTempBreakpoint(TempBreakpoint &bkpt, Addr addr)
|
|
{
|
|
DPRINTF(GDBMisc, "setTempBreakpoint: addr=%#x\n", addr);
|
|
|
|
bkpt.address = addr;
|
|
insertHardBreak(addr, 4);
|
|
}
|
|
|
|
void
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|
RemoteGDB::clearTempBreakpoint(TempBreakpoint &bkpt)
|
|
{
|
|
DPRINTF(GDBMisc, "setTempBreakpoint: addr=%#x\n",
|
|
bkpt.address);
|
|
|
|
|
|
removeHardBreak(bkpt.address, 4);
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|
bkpt.address = 0;
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|
}
|
|
|
|
void
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|
RemoteGDB::clearSingleStep()
|
|
{
|
|
DPRINTF(GDBMisc, "clearSingleStep bt_addr=%#x nt_addr=%#x\n",
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|
takenBkpt.address, notTakenBkpt.address);
|
|
|
|
if (takenBkpt.address != 0)
|
|
clearTempBreakpoint(takenBkpt);
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|
|
|
if (notTakenBkpt.address != 0)
|
|
clearTempBreakpoint(notTakenBkpt);
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|
}
|
|
|
|
void
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|
RemoteGDB::setSingleStep()
|
|
{
|
|
Addr pc = context->regs.pc;
|
|
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.
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|
MachInst inst = read<MachInst>(pc);
|
|
StaticInstPtr<TheISA> si(inst);
|
|
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)
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|
set_bt = true;
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|
}
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|
|
|
DPRINTF(GDBMisc, "setSingleStep bt_addr=%#x nt_addr=%#x\n",
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takenBkpt.address, notTakenBkpt.address);
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|
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setTempBreakpoint(notTakenBkpt, npc);
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|
|
|
if (set_bt)
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|
setTempBreakpoint(takenBkpt, bpc);
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}
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|
/////////////////////////
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//
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//
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|
|
|
uint8_t
|
|
RemoteGDB::getbyte()
|
|
{
|
|
uint8_t b;
|
|
::read(fd, &b, 1);
|
|
return b;
|
|
}
|
|
|
|
void
|
|
RemoteGDB::putbyte(uint8_t b)
|
|
{
|
|
::write(fd, &b, 1);
|
|
}
|
|
|
|
// Send a packet to gdb
|
|
void
|
|
RemoteGDB::send(const char *bp)
|
|
{
|
|
const char *p;
|
|
uint8_t csum, c;
|
|
|
|
DPRINTF(GDBSend, "send: %s\n", bp);
|
|
|
|
do {
|
|
p = bp;
|
|
putbyte(KGDB_START);
|
|
for (csum = 0; (c = *p); p++) {
|
|
putbyte(c);
|
|
csum += c;
|
|
}
|
|
putbyte(KGDB_END);
|
|
putbyte(i2digit(csum >> 4));
|
|
putbyte(i2digit(csum));
|
|
} while ((c = getbyte() & 0x7f) == KGDB_BADP);
|
|
}
|
|
|
|
// Receive a packet from gdb
|
|
int
|
|
RemoteGDB::recv(char *bp, int maxlen)
|
|
{
|
|
char *p;
|
|
int c, csum;
|
|
int len;
|
|
|
|
do {
|
|
p = bp;
|
|
csum = len = 0;
|
|
while ((c = getbyte()) != KGDB_START)
|
|
;
|
|
|
|
while ((c = getbyte()) != KGDB_END && len < maxlen) {
|
|
c &= 0x7f;
|
|
csum += c;
|
|
*p++ = c;
|
|
len++;
|
|
}
|
|
csum &= 0xff;
|
|
*p = '\0';
|
|
|
|
if (len >= maxlen) {
|
|
putbyte(KGDB_BADP);
|
|
continue;
|
|
}
|
|
|
|
csum -= digit2i(getbyte()) * 16;
|
|
csum -= digit2i(getbyte());
|
|
|
|
if (csum == 0) {
|
|
putbyte(KGDB_GOODP);
|
|
// Sequence present?
|
|
if (bp[2] == ':') {
|
|
putbyte(bp[0]);
|
|
putbyte(bp[1]);
|
|
len -= 3;
|
|
bcopy(bp + 3, bp, len);
|
|
}
|
|
break;
|
|
}
|
|
putbyte(KGDB_BADP);
|
|
} while (1);
|
|
|
|
DPRINTF(GDBRecv, "recv: %s: %s\n", gdb_command(*bp), bp);
|
|
|
|
return (len);
|
|
}
|
|
|
|
// Read bytes from kernel address space for debugger.
|
|
bool
|
|
RemoteGDB::read(Addr vaddr, size_t size, char *data)
|
|
{
|
|
static Addr lastaddr = 0;
|
|
static size_t lastsize = 0;
|
|
|
|
uint8_t *maddr;
|
|
|
|
if (vaddr < 10) {
|
|
DPRINTF(GDBRead, "read: reading memory location zero!\n");
|
|
vaddr = lastaddr + lastsize;
|
|
}
|
|
|
|
DPRINTF(GDBRead, "read: addr=%#x, size=%d", vaddr, size);
|
|
#if TRACING_ON
|
|
char *d = data;
|
|
size_t s = size;
|
|
#endif
|
|
|
|
lastaddr = vaddr;
|
|
lastsize = size;
|
|
|
|
size_t count = min((Addr)size,
|
|
VMPageSize - (vaddr & (VMPageSize - 1)));
|
|
|
|
maddr = vtomem(context, vaddr, count);
|
|
memcpy(data, maddr, count);
|
|
|
|
vaddr += count;
|
|
data += count;
|
|
size -= count;
|
|
|
|
while (size >= VMPageSize) {
|
|
maddr = vtomem(context, vaddr, count);
|
|
memcpy(data, maddr, VMPageSize);
|
|
|
|
vaddr += VMPageSize;
|
|
data += VMPageSize;
|
|
size -= VMPageSize;
|
|
}
|
|
|
|
if (size > 0) {
|
|
maddr = vtomem(context, vaddr, count);
|
|
memcpy(data, maddr, size);
|
|
}
|
|
|
|
#if TRACING_ON
|
|
if (DTRACE(GDBRead)) {
|
|
if (DTRACE(GDBExtra)) {
|
|
char buf[1024];
|
|
mem2hex(buf, d, s);
|
|
DPRINTFNR(": %s\n", buf);
|
|
} else
|
|
DPRINTFNR("\n");
|
|
}
|
|
#endif
|
|
|
|
return true;
|
|
}
|
|
|
|
// Write bytes to kernel address space for debugger.
|
|
bool
|
|
RemoteGDB::write(Addr vaddr, size_t size, const char *data)
|
|
{
|
|
static Addr lastaddr = 0;
|
|
static size_t lastsize = 0;
|
|
|
|
uint8_t *maddr;
|
|
|
|
if (vaddr < 10) {
|
|
DPRINTF(GDBWrite, "write: writing memory location zero!\n");
|
|
vaddr = lastaddr + lastsize;
|
|
}
|
|
|
|
if (DTRACE(GDBWrite)) {
|
|
DPRINTFN("write: addr=%#x, size=%d", vaddr, size);
|
|
if (DTRACE(GDBExtra)) {
|
|
char buf[1024];
|
|
mem2hex(buf, data, size);
|
|
DPRINTFNR(": %s\n", buf);
|
|
} else
|
|
DPRINTFNR("\n");
|
|
}
|
|
|
|
lastaddr = vaddr;
|
|
lastsize = size;
|
|
|
|
size_t count = min((Addr)size,
|
|
VMPageSize - (vaddr & (VMPageSize - 1)));
|
|
|
|
maddr = vtomem(context, vaddr, count);
|
|
memcpy(maddr, data, count);
|
|
|
|
vaddr += count;
|
|
data += count;
|
|
size -= count;
|
|
|
|
while (size >= VMPageSize) {
|
|
maddr = vtomem(context, vaddr, count);
|
|
memcpy(maddr, data, VMPageSize);
|
|
|
|
vaddr += VMPageSize;
|
|
data += VMPageSize;
|
|
size -= VMPageSize;
|
|
}
|
|
|
|
if (size > 0) {
|
|
maddr = vtomem(context, vaddr, count);
|
|
memcpy(maddr, data, size);
|
|
}
|
|
|
|
#ifdef IMB
|
|
alpha_pal_imb();
|
|
#endif
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
PCEventQueue *RemoteGDB::getPcEventQueue()
|
|
{
|
|
return &system->pcEventQueue;
|
|
}
|
|
|
|
|
|
RemoteGDB::HardBreakpoint::HardBreakpoint(RemoteGDB *_gdb, Addr pc)
|
|
: PCEvent(_gdb->getPcEventQueue(), "HardBreakpoint Event", pc),
|
|
gdb(_gdb), refcount(0)
|
|
{
|
|
DPRINTF(GDBMisc, "creating hardware breakpoint at %#x\n", evpc);
|
|
}
|
|
|
|
void
|
|
RemoteGDB::HardBreakpoint::process(ExecContext *xc)
|
|
{
|
|
DPRINTF(GDBMisc, "handling hardware breakpoint at %#x\n", pc());
|
|
|
|
if (xc == gdb->context)
|
|
gdb->trap(ALPHA_KENTRY_INT);
|
|
}
|
|
|
|
bool
|
|
RemoteGDB::insertSoftBreak(Addr addr, size_t len)
|
|
{
|
|
if (len != sizeof(MachInst))
|
|
panic("invalid length\n");
|
|
|
|
return insertHardBreak(addr, len);
|
|
}
|
|
|
|
bool
|
|
RemoteGDB::removeSoftBreak(Addr addr, size_t len)
|
|
{
|
|
if (len != sizeof(MachInst))
|
|
panic("invalid length\n");
|
|
|
|
return removeHardBreak(addr, len);
|
|
}
|
|
|
|
bool
|
|
RemoteGDB::insertHardBreak(Addr addr, size_t len)
|
|
{
|
|
if (len != sizeof(MachInst))
|
|
panic("invalid length\n");
|
|
|
|
DPRINTF(GDBMisc, "inserting hardware breakpoint at %#x\n", addr);
|
|
|
|
HardBreakpoint *&bkpt = hardBreakMap[addr];
|
|
if (bkpt == 0)
|
|
bkpt = new HardBreakpoint(this, addr);
|
|
|
|
bkpt->refcount++;
|
|
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
RemoteGDB::removeHardBreak(Addr addr, size_t len)
|
|
{
|
|
if (len != sizeof(MachInst))
|
|
panic("invalid length\n");
|
|
|
|
DPRINTF(GDBMisc, "removing hardware breakpoint at %#x\n", addr);
|
|
|
|
break_iter_t i = hardBreakMap.find(addr);
|
|
if (i == hardBreakMap.end())
|
|
return false;
|
|
|
|
HardBreakpoint *hbp = (*i).second;
|
|
if (--hbp->refcount == 0) {
|
|
delete hbp;
|
|
hardBreakMap.erase(i);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
const char *
|
|
break_type(char c)
|
|
{
|
|
switch(c) {
|
|
case '0': return "software breakpoint";
|
|
case '1': return "hardware breakpoint";
|
|
case '2': return "write watchpoint";
|
|
case '3': return "read watchpoint";
|
|
case '4': return "access watchpoint";
|
|
default: return "unknown breakpoint/watchpoint";
|
|
}
|
|
}
|
|
|
|
// This function does all command processing for interfacing to a
|
|
// remote gdb. Note that the error codes are ignored by gdb at
|
|
// present, but might eventually become meaningful. (XXX) It might
|
|
// makes sense to use POSIX errno values, because that is what the
|
|
// gdb/remote.c functions want to return.
|
|
bool
|
|
RemoteGDB::trap(int type)
|
|
{
|
|
uint64_t val;
|
|
size_t datalen, len;
|
|
char data[KGDB_BUFLEN + 1];
|
|
char buffer[sizeof(gdbregs) * 2 + 256];
|
|
char temp[KGDB_BUFLEN];
|
|
const char *p;
|
|
char command, subcmd;
|
|
string var;
|
|
bool ret;
|
|
|
|
if (!attached)
|
|
return false;
|
|
|
|
DPRINTF(GDBMisc, "trap: PC=%#x NPC=%#x\n",
|
|
context->regs.pc, context->regs.npc);
|
|
|
|
clearSingleStep();
|
|
|
|
/*
|
|
* The first entry to this function is normally through
|
|
* a breakpoint trap in kgdb_connect(), in which case we
|
|
* must advance past the breakpoint because gdb will not.
|
|
*
|
|
* On the first entry here, we expect that gdb is not yet
|
|
* listening to us, so just enter the interaction loop.
|
|
* After the debugger is "active" (connected) it will be
|
|
* waiting for a "signaled" message from us.
|
|
*/
|
|
if (!active)
|
|
active = true;
|
|
else
|
|
// Tell remote host that an exception has occurred.
|
|
snprintf((char *)buffer, sizeof(buffer), "S%02x", signal(type));
|
|
send(buffer);
|
|
|
|
// Stick frame regs into our reg cache.
|
|
getregs();
|
|
|
|
for (;;) {
|
|
datalen = recv(data, sizeof(data));
|
|
data[sizeof(data) - 1] = 0; // Sentinel
|
|
command = data[0];
|
|
subcmd = 0;
|
|
p = data + 1;
|
|
switch (command) {
|
|
|
|
case KGDB_SIGNAL:
|
|
// if this command came from a running gdb, answer it --
|
|
// the other guy has no way of knowing if we're in or out
|
|
// of this loop when he issues a "remote-signal".
|
|
snprintf((char *)buffer, sizeof(buffer), "S%02x", signal(type));
|
|
send(buffer);
|
|
continue;
|
|
|
|
case KGDB_REG_R:
|
|
if (2 * sizeof(gdbregs) > sizeof(buffer))
|
|
panic("buffer too small");
|
|
|
|
mem2hex(buffer, gdbregs, sizeof(gdbregs));
|
|
send(buffer);
|
|
continue;
|
|
|
|
case KGDB_REG_W:
|
|
p = hex2mem(gdbregs, p, sizeof(gdbregs));
|
|
if (p == NULL || *p != '\0')
|
|
send("E01");
|
|
else {
|
|
setregs();
|
|
send("OK");
|
|
}
|
|
continue;
|
|
|
|
#if 0
|
|
case KGDB_SET_REG:
|
|
val = hex2i(&p);
|
|
if (*p++ != '=') {
|
|
send("E01");
|
|
continue;
|
|
}
|
|
if (val < 0 && val >= KGDB_NUMREGS) {
|
|
send("E01");
|
|
continue;
|
|
}
|
|
|
|
gdbregs[val] = hex2i(&p);
|
|
setregs();
|
|
send("OK");
|
|
|
|
continue;
|
|
#endif
|
|
|
|
case KGDB_MEM_R:
|
|
val = hex2i(&p);
|
|
if (*p++ != ',') {
|
|
send("E02");
|
|
continue;
|
|
}
|
|
len = hex2i(&p);
|
|
if (*p != '\0') {
|
|
send("E03");
|
|
continue;
|
|
}
|
|
if (len > sizeof(buffer)) {
|
|
send("E04");
|
|
continue;
|
|
}
|
|
if (!acc(val, len)) {
|
|
send("E05");
|
|
continue;
|
|
}
|
|
|
|
if (read(val, (size_t)len, (char *)buffer)) {
|
|
mem2hex(temp, buffer, len);
|
|
send(temp);
|
|
} else {
|
|
send("E05");
|
|
}
|
|
continue;
|
|
|
|
case KGDB_MEM_W:
|
|
val = hex2i(&p);
|
|
if (*p++ != ',') {
|
|
send("E06");
|
|
continue;
|
|
}
|
|
len = hex2i(&p);
|
|
if (*p++ != ':') {
|
|
send("E07");
|
|
continue;
|
|
}
|
|
if (len > datalen - (p - data)) {
|
|
send("E08");
|
|
continue;
|
|
}
|
|
p = hex2mem(buffer, p, sizeof(buffer));
|
|
if (p == NULL) {
|
|
send("E09");
|
|
continue;
|
|
}
|
|
if (!acc(val, len)) {
|
|
send("E0A");
|
|
continue;
|
|
}
|
|
if (write(val, (size_t)len, (char *)buffer))
|
|
send("OK");
|
|
else
|
|
send("E0B");
|
|
continue;
|
|
|
|
case KGDB_SET_THREAD:
|
|
subcmd = *p++;
|
|
val = hex2i(&p);
|
|
if (val == 0)
|
|
send("OK");
|
|
else
|
|
send("E01");
|
|
continue;
|
|
|
|
case KGDB_DETACH:
|
|
case KGDB_KILL:
|
|
active = false;
|
|
clearSingleStep();
|
|
detach();
|
|
goto out;
|
|
|
|
case KGDB_ASYNC_CONT:
|
|
subcmd = hex2i(&p);
|
|
if (*p++ == ';') {
|
|
val = hex2i(&p);
|
|
context->regs.pc = val;
|
|
context->regs.npc = val + sizeof(MachInst);
|
|
}
|
|
clearSingleStep();
|
|
goto out;
|
|
|
|
case KGDB_CONT:
|
|
if (p - data < datalen) {
|
|
val = hex2i(&p);
|
|
context->regs.pc = val;
|
|
context->regs.npc = val + sizeof(MachInst);
|
|
}
|
|
clearSingleStep();
|
|
goto out;
|
|
|
|
case KGDB_ASYNC_STEP:
|
|
subcmd = hex2i(&p);
|
|
if (*p++ == ';') {
|
|
val = hex2i(&p);
|
|
context->regs.pc = val;
|
|
context->regs.npc = val + sizeof(MachInst);
|
|
}
|
|
setSingleStep();
|
|
goto out;
|
|
|
|
case KGDB_STEP:
|
|
if (p - data < datalen) {
|
|
val = hex2i(&p);
|
|
context->regs.pc = val;
|
|
context->regs.npc = val + sizeof(MachInst);
|
|
}
|
|
setSingleStep();
|
|
goto out;
|
|
|
|
case KGDB_CLR_HW_BKPT:
|
|
subcmd = *p++;
|
|
if (*p++ != ',') send("E0D");
|
|
val = hex2i(&p);
|
|
if (*p++ != ',') send("E0D");
|
|
len = hex2i(&p);
|
|
|
|
DPRINTF(GDBMisc, "clear %s, addr=%#x, len=%d\n",
|
|
break_type(subcmd), val, len);
|
|
|
|
ret = false;
|
|
|
|
switch (subcmd) {
|
|
case '0': // software breakpoint
|
|
ret = removeSoftBreak(val, len);
|
|
break;
|
|
|
|
case '1': // hardware breakpoint
|
|
ret = removeHardBreak(val, len);
|
|
break;
|
|
|
|
case '2': // write watchpoint
|
|
case '3': // read watchpoint
|
|
case '4': // access watchpoint
|
|
default: // unknown
|
|
send("");
|
|
break;
|
|
}
|
|
|
|
send(ret ? "OK" : "E0C");
|
|
continue;
|
|
|
|
case KGDB_SET_HW_BKPT:
|
|
subcmd = *p++;
|
|
if (*p++ != ',') send("E0D");
|
|
val = hex2i(&p);
|
|
if (*p++ != ',') send("E0D");
|
|
len = hex2i(&p);
|
|
|
|
DPRINTF(GDBMisc, "set %s, addr=%#x, len=%d\n",
|
|
break_type(subcmd), val, len);
|
|
|
|
ret = false;
|
|
|
|
switch (subcmd) {
|
|
case '0': // software breakpoint
|
|
ret = insertSoftBreak(val, len);
|
|
break;
|
|
|
|
case '1': // hardware breakpoint
|
|
ret = insertHardBreak(val, len);
|
|
break;
|
|
|
|
case '2': // write watchpoint
|
|
case '3': // read watchpoint
|
|
case '4': // access watchpoint
|
|
default: // unknown
|
|
send("");
|
|
break;
|
|
}
|
|
|
|
send(ret ? "OK" : "E0C");
|
|
continue;
|
|
|
|
case KGDB_QUERY_VAR:
|
|
var = string(p, datalen - 1);
|
|
if (var == "C")
|
|
send("QC0");
|
|
else
|
|
send("");
|
|
continue;
|
|
|
|
case KGDB_SET_BAUD:
|
|
case KGDB_SET_BREAK:
|
|
case KGDB_DEBUG:
|
|
case KGDB_CYCLE_STEP:
|
|
case KGDB_SIG_CYCLE_STEP:
|
|
case KGDB_READ_REG:
|
|
case KGDB_SET_VAR:
|
|
case KGDB_RESET:
|
|
case KGDB_THREAD_ALIVE:
|
|
case KGDB_TARGET_EXIT:
|
|
case KGDB_BINARY_DLOAD:
|
|
// Unsupported command
|
|
DPRINTF(GDBMisc, "Unsupported command: %s\n",
|
|
gdb_command(command));
|
|
DDUMP(GDBMisc, (uint8_t *)data, datalen);
|
|
send("");
|
|
continue;
|
|
|
|
default:
|
|
// Unknown command.
|
|
DPRINTF(GDBMisc, "Unknown command: %c(%#x)\n",
|
|
command, command);
|
|
send("");
|
|
continue;
|
|
|
|
|
|
}
|
|
}
|
|
|
|
out:
|
|
return true;
|
|
}
|
|
|
|
// Convert a hex digit into an integer.
|
|
// This returns -1 if the argument passed is no valid hex digit.
|
|
int
|
|
digit2i(char c)
|
|
{
|
|
if (c >= '0' && c <= '9')
|
|
return (c - '0');
|
|
else if (c >= 'a' && c <= 'f')
|
|
return (c - 'a' + 10);
|
|
else if (c >= 'A' && c <= 'F')
|
|
|
|
return (c - 'A' + 10);
|
|
else
|
|
return (-1);
|
|
}
|
|
|
|
// Convert the low 4 bits of an integer into an hex digit.
|
|
char
|
|
i2digit(int n)
|
|
{
|
|
return ("0123456789abcdef"[n & 0x0f]);
|
|
}
|
|
|
|
// Convert a byte array into an hex string.
|
|
void
|
|
mem2hex(void *vdst, const void *vsrc, int len)
|
|
{
|
|
char *dst = (char *)vdst;
|
|
const char *src = (const char *)vsrc;
|
|
|
|
while (len--) {
|
|
*dst++ = i2digit(*src >> 4);
|
|
*dst++ = i2digit(*src++);
|
|
}
|
|
*dst = '\0';
|
|
}
|
|
|
|
// Convert an hex string into a byte array.
|
|
// This returns a pointer to the character following the last valid
|
|
// hex digit. If the string ends in the middle of a byte, NULL is
|
|
// returned.
|
|
const char *
|
|
hex2mem(void *vdst, const char *src, int maxlen)
|
|
{
|
|
char *dst = (char *)vdst;
|
|
int msb, lsb;
|
|
|
|
while (*src && maxlen--) {
|
|
msb = digit2i(*src++);
|
|
if (msb < 0)
|
|
return (src - 1);
|
|
lsb = digit2i(*src++);
|
|
if (lsb < 0)
|
|
return (NULL);
|
|
*dst++ = (msb << 4) | lsb;
|
|
}
|
|
return (src);
|
|
}
|
|
|
|
// Convert an hex string into an integer.
|
|
// This returns a pointer to the character following the last valid
|
|
// hex digit.
|
|
Addr
|
|
hex2i(const char **srcp)
|
|
{
|
|
const char *src = *srcp;
|
|
Addr r = 0;
|
|
int nibble;
|
|
|
|
while ((nibble = digit2i(*src)) >= 0) {
|
|
r *= 16;
|
|
r += nibble;
|
|
src++;
|
|
}
|
|
*srcp = src;
|
|
return (r);
|
|
}
|
|
|