1025 lines
28 KiB
C++
1025 lines
28 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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* Authors: Nathan Binkert
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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 <string>
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#include <unistd.h>
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#include "config/full_system.hh"
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#if FULL_SYSTEM
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#include "arch/vtophys.hh"
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#endif
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#include "base/intmath.hh"
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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/thread_context.hh"
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#include "cpu/static_inst.hh"
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//#include "mem/physical.hh"
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#include "mem/port.hh"
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#include "mem/translating_port.hh"
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#include "sim/system.hh"
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using namespace std;
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using namespace TheISA;
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#ifndef NDEBUG
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vector<BaseRemoteGDB *> debuggers;
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void
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debugger()
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{
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static int current_debugger = -1;
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if (current_debugger >= 0 && current_debugger < (int)debuggers.size()) {
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BaseRemoteGDB *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(SIGILL);
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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(BaseRemoteGDB *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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if (ListenSocket::allDisabled()) {
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warn_once("Sockets disabled, not accepting gdb connections");
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return;
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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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BaseRemoteGDB::Event::Event(BaseRemoteGDB *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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BaseRemoteGDB::Event::process(int revent)
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{
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if (revent & POLLIN)
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gdb->trap(SIGILL);
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else if (revent & POLLNVAL)
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gdb->detach();
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}
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BaseRemoteGDB::BaseRemoteGDB(System *_system, ThreadContext *c, size_t cacheSize)
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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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gdbregs(cacheSize)
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{
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memset(gdbregs.regs, 0, gdbregs.bytes());
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}
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BaseRemoteGDB::~BaseRemoteGDB()
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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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BaseRemoteGDB::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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BaseRemoteGDB::isattached()
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{ return attached; }
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void
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BaseRemoteGDB::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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BaseRemoteGDB::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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BaseRemoteGDB::gdb_command(char cmd)
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{
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switch (cmd) {
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case GDBSignal: return "KGDB_SIGNAL";
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case GDBSetBaud: return "KGDB_SET_BAUD";
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case GDBSetBreak: return "KGDB_SET_BREAK";
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case GDBCont: return "KGDB_CONT";
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case GDBAsyncCont: return "KGDB_ASYNC_CONT";
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case GDBDebug: return "KGDB_DEBUG";
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case GDBDetach: return "KGDB_DETACH";
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case GDBRegR: return "KGDB_REG_R";
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case GDBRegW: return "KGDB_REG_W";
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case GDBSetThread: return "KGDB_SET_THREAD";
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case GDBCycleStep: return "KGDB_CYCLE_STEP";
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case GDBSigCycleStep: return "KGDB_SIG_CYCLE_STEP";
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case GDBKill: return "KGDB_KILL";
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case GDBMemW: return "KGDB_MEM_W";
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case GDBMemR: return "KGDB_MEM_R";
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case GDBSetReg: return "KGDB_SET_REG";
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case GDBReadReg: return "KGDB_READ_REG";
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case GDBQueryVar: return "KGDB_QUERY_VAR";
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case GDBSetVar: return "KGDB_SET_VAR";
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case GDBReset: return "KGDB_RESET";
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case GDBStep: return "KGDB_STEP";
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case GDBAsyncStep: return "KGDB_ASYNC_STEP";
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case GDBThreadAlive: return "KGDB_THREAD_ALIVE";
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case GDBTargetExit: return "KGDB_TARGET_EXIT";
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case GDBBinaryDload: return "KGDB_BINARY_DLOAD";
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case GDBClrHwBkpt: return "KGDB_CLR_HW_BKPT";
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case GDBSetHwBkpt: return "KGDB_SET_HW_BKPT";
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case GDBStart: return "KGDB_START";
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case GDBEnd: return "KGDB_END";
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case GDBGoodP: return "KGDB_GOODP";
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case GDBBadP: 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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//
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//
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uint8_t
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BaseRemoteGDB::getbyte()
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{
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uint8_t b;
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if (::read(fd, &b, 1) != 1)
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warn("could not read byte from debugger");
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return b;
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}
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void
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BaseRemoteGDB::putbyte(uint8_t b)
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{
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if (::write(fd, &b, 1) != 1)
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warn("could not write byte to debugger");
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}
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// Send a packet to gdb
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void
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BaseRemoteGDB::send(const char *bp)
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{
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const char *p;
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uint8_t csum, c;
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DPRINTF(GDBSend, "send: %s\n", bp);
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do {
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p = bp;
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//Start sending a packet
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putbyte(GDBStart);
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//Send the contents, and also keep a check sum.
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for (csum = 0; (c = *p); p++) {
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putbyte(c);
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csum += c;
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}
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//Send the ending character.
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putbyte(GDBEnd);
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//Sent the checksum.
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putbyte(i2digit(csum >> 4));
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putbyte(i2digit(csum));
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//Try transmitting over and over again until the other end doesn't send an
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//error back.
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} while ((c = getbyte() & 0x7f) == GDBBadP);
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}
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// Receive a packet from gdb
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int
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BaseRemoteGDB::recv(char *bp, int maxlen)
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{
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char *p;
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int c, csum;
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int len;
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do {
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p = bp;
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csum = len = 0;
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//Find the beginning of a packet
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while ((c = getbyte()) != GDBStart)
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;
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//Read until you find the end of the data in the packet, and keep
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//track of the check sum.
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while ((c = getbyte()) != GDBEnd && len < maxlen) {
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c &= 0x7f;
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csum += c;
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*p++ = c;
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len++;
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}
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//Mask the check sum, and terminate the command string.
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csum &= 0xff;
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*p = '\0';
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//If the command was too long, report an error.
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if (len >= maxlen) {
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putbyte(GDBBadP);
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continue;
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}
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//Bring in the checksum. If the check sum matches, csum will be 0.
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csum -= digit2i(getbyte()) * 16;
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csum -= digit2i(getbyte());
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//If the check sum was correct
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if (csum == 0) {
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//Report that the packet was received correctly
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putbyte(GDBGoodP);
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// Sequence present?
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if (bp[2] == ':') {
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putbyte(bp[0]);
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putbyte(bp[1]);
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len -= 3;
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memcpy(bp, bp+3, len);
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}
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break;
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}
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//Otherwise, report that there was a mistake.
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putbyte(GDBBadP);
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} while (1);
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DPRINTF(GDBRecv, "recv: %s: %s\n", gdb_command(*bp), bp);
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return (len);
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}
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// Read bytes from kernel address space for debugger.
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bool
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BaseRemoteGDB::read(Addr vaddr, size_t size, char *data)
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{
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static Addr lastaddr = 0;
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static size_t lastsize = 0;
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|
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if (vaddr < 10) {
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DPRINTF(GDBRead, "read: reading memory location zero!\n");
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vaddr = lastaddr + lastsize;
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}
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DPRINTF(GDBRead, "read: addr=%#x, size=%d", vaddr, size);
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|
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#if FULL_SYSTEM
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VirtualPort *port = context->getVirtPort();
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#else
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TranslatingPort *port = context->getMemPort();
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#endif
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port->readBlob(vaddr, (uint8_t*)data, size);
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|
|
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#if TRACING_ON
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|
if (DTRACE(GDBRead)) {
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|
if (DTRACE(GDBExtra)) {
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char buf[1024];
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mem2hex(buf, data, size);
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DPRINTFNR(": %s\n", buf);
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} else
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DPRINTFNR("\n");
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|
}
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#endif
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return true;
|
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}
|
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|
|
// Write bytes to kernel address space for debugger.
|
|
bool
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BaseRemoteGDB::write(Addr vaddr, size_t size, const char *data)
|
|
{
|
|
static Addr lastaddr = 0;
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|
static size_t lastsize = 0;
|
|
|
|
if (vaddr < 10) {
|
|
DPRINTF(GDBWrite, "write: writing memory location zero!\n");
|
|
vaddr = lastaddr + lastsize;
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|
}
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|
|
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if (DTRACE(GDBWrite)) {
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DPRINTFN("write: addr=%#x, size=%d", vaddr, size);
|
|
if (DTRACE(GDBExtra)) {
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char buf[1024];
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mem2hex(buf, data, size);
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DPRINTFNR(": %s\n", buf);
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} else
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DPRINTFNR("\n");
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|
}
|
|
#if FULL_SYSTEM
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|
VirtualPort *port = context->getVirtPort();
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|
#else
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TranslatingPort *port = context->getMemPort();
|
|
#endif
|
|
port->writeBlob(vaddr, (uint8_t*)data, size);
|
|
#if !FULL_SYSTEM
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|
delete port;
|
|
#endif
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|
|
|
return true;
|
|
}
|
|
|
|
PCEventQueue *BaseRemoteGDB::getPcEventQueue()
|
|
{
|
|
return &system->pcEventQueue;
|
|
}
|
|
|
|
BaseRemoteGDB::HardBreakpoint::HardBreakpoint(BaseRemoteGDB *_gdb, Addr pc)
|
|
: PCEvent(_gdb->getPcEventQueue(), "HardBreakpoint Event", pc),
|
|
gdb(_gdb), refcount(0)
|
|
{
|
|
DPRINTF(GDBMisc, "creating hardware breakpoint at %#x\n", evpc);
|
|
}
|
|
|
|
void
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|
BaseRemoteGDB::HardBreakpoint::process(ThreadContext *tc)
|
|
{
|
|
DPRINTF(GDBMisc, "handling hardware breakpoint at %#x\n", pc());
|
|
|
|
if (tc == gdb->context)
|
|
gdb->trap(SIGTRAP);
|
|
}
|
|
|
|
bool
|
|
BaseRemoteGDB::insertSoftBreak(Addr addr, size_t len)
|
|
{
|
|
if (len != sizeof(TheISA::MachInst))
|
|
panic("invalid length\n");
|
|
|
|
return insertHardBreak(addr, len);
|
|
}
|
|
|
|
bool
|
|
BaseRemoteGDB::removeSoftBreak(Addr addr, size_t len)
|
|
{
|
|
if (len != sizeof(MachInst))
|
|
panic("invalid length\n");
|
|
|
|
return removeHardBreak(addr, len);
|
|
}
|
|
|
|
bool
|
|
BaseRemoteGDB::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
|
|
BaseRemoteGDB::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;
|
|
}
|
|
|
|
void
|
|
BaseRemoteGDB::setTempBreakpoint(Addr bkpt)
|
|
{
|
|
DPRINTF(GDBMisc, "setTempBreakpoint: addr=%#x\n", bkpt);
|
|
insertHardBreak(bkpt, sizeof(TheISA::MachInst));
|
|
}
|
|
|
|
void
|
|
BaseRemoteGDB::clearTempBreakpoint(Addr &bkpt)
|
|
{
|
|
DPRINTF(GDBMisc, "setTempBreakpoint: addr=%#x\n", bkpt);
|
|
removeHardBreak(bkpt, sizeof(TheISA::MachInst));
|
|
bkpt = 0;
|
|
}
|
|
|
|
const char *
|
|
BaseRemoteGDB::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
|
|
BaseRemoteGDB::trap(int type)
|
|
{
|
|
uint64_t val;
|
|
size_t datalen, len;
|
|
char data[GDBPacketBufLen + 1];
|
|
char *buffer;
|
|
size_t bufferSize;
|
|
const char *p;
|
|
char command, subcmd;
|
|
string var;
|
|
bool ret;
|
|
|
|
if (!attached)
|
|
return false;
|
|
|
|
bufferSize = gdbregs.bytes() * 2 + 256;
|
|
buffer = (char*)malloc(bufferSize);
|
|
|
|
DPRINTF(GDBMisc, "trap: PC=%#x NPC=%#x\n",
|
|
context->readPC(), context->readNextPC());
|
|
|
|
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, bufferSize, "S%02x", 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 GDBSignal:
|
|
// 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, bufferSize,
|
|
"S%02x", type);
|
|
send(buffer);
|
|
continue;
|
|
|
|
case GDBRegR:
|
|
if (2 * gdbregs.bytes() > bufferSize)
|
|
panic("buffer too small");
|
|
|
|
mem2hex(buffer, gdbregs.regs, gdbregs.bytes());
|
|
send(buffer);
|
|
continue;
|
|
|
|
case GDBRegW:
|
|
p = hex2mem(gdbregs.regs, p, gdbregs.bytes());
|
|
if (p == NULL || *p != '\0')
|
|
send("E01");
|
|
else {
|
|
setregs();
|
|
send("OK");
|
|
}
|
|
continue;
|
|
|
|
#if 0
|
|
case GDBSetReg:
|
|
val = hex2i(&p);
|
|
if (*p++ != '=') {
|
|
send("E01");
|
|
continue;
|
|
}
|
|
if (val < 0 && val >= KGDB_NUMREGS) {
|
|
send("E01");
|
|
continue;
|
|
}
|
|
|
|
gdbregs.regs[val] = hex2i(&p);
|
|
setregs();
|
|
send("OK");
|
|
|
|
continue;
|
|
#endif
|
|
|
|
case GDBMemR:
|
|
val = hex2i(&p);
|
|
if (*p++ != ',') {
|
|
send("E02");
|
|
continue;
|
|
}
|
|
len = hex2i(&p);
|
|
if (*p != '\0') {
|
|
send("E03");
|
|
continue;
|
|
}
|
|
if (len > bufferSize) {
|
|
send("E04");
|
|
continue;
|
|
}
|
|
if (!acc(val, len)) {
|
|
send("E05");
|
|
continue;
|
|
}
|
|
|
|
if (read(val, (size_t)len, (char *)buffer)) {
|
|
// variable length array would be nice, but C++ doesn't
|
|
// officially support those...
|
|
char *temp = new char[2*len+1];
|
|
mem2hex(temp, buffer, len);
|
|
send(temp);
|
|
delete [] temp;
|
|
} else {
|
|
send("E05");
|
|
}
|
|
continue;
|
|
|
|
case GDBMemW:
|
|
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, bufferSize);
|
|
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 GDBSetThread:
|
|
subcmd = *p++;
|
|
val = hex2i(&p);
|
|
if (val == 0)
|
|
send("OK");
|
|
else
|
|
send("E01");
|
|
continue;
|
|
|
|
case GDBDetach:
|
|
case GDBKill:
|
|
active = false;
|
|
clearSingleStep();
|
|
detach();
|
|
goto out;
|
|
|
|
case GDBAsyncCont:
|
|
subcmd = hex2i(&p);
|
|
if (*p++ == ';') {
|
|
val = hex2i(&p);
|
|
context->setPC(val);
|
|
context->setNextPC(val + sizeof(MachInst));
|
|
}
|
|
clearSingleStep();
|
|
goto out;
|
|
|
|
case GDBCont:
|
|
if (p - data < (ptrdiff_t)datalen) {
|
|
val = hex2i(&p);
|
|
context->setPC(val);
|
|
context->setNextPC(val + sizeof(MachInst));
|
|
}
|
|
clearSingleStep();
|
|
goto out;
|
|
|
|
case GDBAsyncStep:
|
|
subcmd = hex2i(&p);
|
|
if (*p++ == ';') {
|
|
val = hex2i(&p);
|
|
context->setPC(val);
|
|
context->setNextPC(val + sizeof(MachInst));
|
|
}
|
|
setSingleStep();
|
|
goto out;
|
|
|
|
case GDBStep:
|
|
if (p - data < (ptrdiff_t)datalen) {
|
|
val = hex2i(&p);
|
|
context->setPC(val);
|
|
context->setNextPC(val + sizeof(MachInst));
|
|
}
|
|
setSingleStep();
|
|
goto out;
|
|
|
|
case GDBClrHwBkpt:
|
|
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 GDBSetHwBkpt:
|
|
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 GDBQueryVar:
|
|
var = string(p, datalen - 1);
|
|
if (var == "C")
|
|
send("QC0");
|
|
else
|
|
send("");
|
|
continue;
|
|
|
|
case GDBSetBaud:
|
|
case GDBSetBreak:
|
|
case GDBDebug:
|
|
case GDBCycleStep:
|
|
case GDBSigCycleStep:
|
|
case GDBReadReg:
|
|
case GDBSetVar:
|
|
case GDBReset:
|
|
case GDBThreadAlive:
|
|
case GDBTargetExit:
|
|
case GDBBinaryDload:
|
|
// 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:
|
|
free(buffer);
|
|
return true;
|
|
}
|
|
|
|
// Convert a hex digit into an integer.
|
|
// This returns -1 if the argument passed is no valid hex digit.
|
|
int
|
|
BaseRemoteGDB::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
|
|
BaseRemoteGDB::i2digit(int n)
|
|
{
|
|
return ("0123456789abcdef"[n & 0x0f]);
|
|
}
|
|
|
|
// Convert a byte array into an hex string.
|
|
void
|
|
BaseRemoteGDB::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 *
|
|
BaseRemoteGDB::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
|
|
BaseRemoteGDB::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);
|
|
}
|
|
|