d765dbf22c
Currently, the wire format of register values in g- and G-packets is modelled using a union of uint8/16/32/64 arrays. The offset positions of each register are expressed as a "register count" scaled according to the width of the register in question. This results in counter- intuitive and error-prone "register count arithmetic", and some formats would even be altogether unrepresentable in such model, e.g. a 64-bit register following a 32-bit one would have a fractional index in the regs64 array. Another difficulty is that the array is allocated before the actual architecture of the workload is known (and therefore before the correct size for the array can be calculated). With this patch I propose a simpler mechanism for expressing the register set structure. In the new code, GdbRegCache is an abstract class; its subclasses contain straightforward structs reflecting the register representation. The determination whether to use e.g. the AArch32 vs. AArch64 register set (or SPARCv8 vs SPARCv9, etc.) is made by polymorphically dispatching getregs() to the concrete subclass. The subclass is not instantiated until it is needed for actual g-/G-packet processing, when the mode is already known. This patch is not meant to be merged in on its own, because it changes the contract between src/base/remote_gdb.* and src/arch/*/remote_gdb.*, so as it stands right now, it would break the other architectures. In this patch only the base and the ARM code are provided for review; once we agree on the structure, I will provide src/arch/*/remote_gdb.* for the other architectures; those patches could then be merged in together. Review Request: http://reviews.gem5.org/r/3207/ Pushed by Joel Hestness <jthestness@gmail.com>
257 lines
9.8 KiB
C++
257 lines
9.8 KiB
C++
/*
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* Copyright 2015 LabWare
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* Copyright 2014 Google, Inc.
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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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* Boris Shingarov
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*/
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/*
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* Copyright (c) 1990, 1993 The Regents of the University of California
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* 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 <signal.h>
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#include <sys/signal.h>
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#include <unistd.h>
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#include <string>
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#include "arch/sparc/remote_gdb.hh"
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#include "arch/vtophys.hh"
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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/static_inst.hh"
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#include "cpu/thread_context.hh"
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#include "debug/GDBAcc.hh"
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#include "debug/GDBRead.hh"
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#include "mem/page_table.hh"
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#include "mem/physical.hh"
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#include "mem/port.hh"
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#include "sim/byteswap.hh"
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#include "sim/full_system.hh"
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#include "sim/process.hh"
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#include "sim/system.hh"
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using namespace std;
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using namespace SparcISA;
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RemoteGDB::RemoteGDB(System *_system, ThreadContext *c)
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: BaseRemoteGDB(_system, c)
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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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//@Todo In NetBSD, this function checks if all addresses
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// from va to va + len have valid page map entries. Not
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// sure how this will work for other OSes or in general.
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if (FullSystem) {
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if (va)
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return true;
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return false;
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} else {
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TlbEntry entry;
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// Check to make sure the first byte is mapped into the processes
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// address space.
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if (context->getProcessPtr()->pTable->lookup(va, entry))
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return true;
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return false;
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}
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}
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void
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RemoteGDB::SPARCGdbRegCache::getRegs(ThreadContext *context)
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{
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DPRINTF(GDBAcc, "getRegs in remotegdb \n");
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for (int i = 0; i < 32; i++) r.gpr[i] = htobe((uint32_t)context->readIntReg(i));
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PCState pc = context->pcState();
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r.pc = htobe((uint32_t)pc.pc());
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r.npc = htobe((uint32_t)pc.npc());
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r.y = htobe((uint32_t)context->readIntReg(NumIntArchRegs + 1));
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PSTATE pstate = context->readMiscReg(MISCREG_PSTATE);
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r.psr = htobe((uint32_t)pstate);
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r.fsr = htobe((uint32_t)context->readMiscReg(MISCREG_FSR));
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r.csr = htobe((uint32_t)context->readIntReg(NumIntArchRegs + 2));
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}
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void
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RemoteGDB::SPARC64GdbRegCache::getRegs(ThreadContext *context)
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{
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DPRINTF(GDBAcc, "getRegs in remotegdb \n");
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for (int i = 0; i < 32; i++) r.gpr[i] = htobe(context->readIntReg(i));
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for (int i = 0; i < 32; i++) r.fpr[i] = 0;
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PCState pc = context->pcState();
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r.pc = htobe(pc.pc());
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r.npc = htobe(pc.npc());
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r.fsr = htobe(context->readMiscReg(MISCREG_FSR));
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r.fprs = htobe(context->readMiscReg(MISCREG_FPRS));
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r.y = htobe(context->readIntReg(NumIntArchRegs + 1));
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PSTATE pstate = context->readMiscReg(MISCREG_PSTATE);
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r.state = htobe(
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context->readMiscReg(MISCREG_CWP) |
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pstate << 8 |
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context->readMiscReg(MISCREG_ASI) << 24 |
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context->readIntReg(NumIntArchRegs + 2) << 32);
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}
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void
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RemoteGDB::SPARCGdbRegCache::setRegs(ThreadContext *context) const
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{
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for (int i = 0; i < 32; i++) context->setIntReg(i, r.gpr[i]);
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PCState pc;
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pc.pc(r.pc);
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pc.npc(r.npc);
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pc.nnpc(pc.npc() + sizeof(MachInst));
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pc.upc(0);
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pc.nupc(1);
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context->pcState(pc);
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// Floating point registers are left at 0 in netbsd
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// All registers other than the pc, npc and int regs
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// are ignored as well.
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}
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void
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RemoteGDB::SPARC64GdbRegCache::setRegs(ThreadContext *context) const
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{
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for (int i = 0; i < 32; i++) context->setIntReg(i, r.gpr[i]);
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PCState pc;
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pc.pc(r.pc);
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pc.npc(r.npc);
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pc.nnpc(pc.npc() + sizeof(MachInst));
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pc.upc(0);
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pc.nupc(1);
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context->pcState(pc);
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// Floating point registers are left at 0 in netbsd
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// All registers other than the pc, npc and int regs
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// are ignored as well.
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}
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RemoteGDB::BaseGdbRegCache*
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RemoteGDB::gdbRegs()
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{
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PSTATE pstate = context->readMiscReg(MISCREG_PSTATE);
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if (pstate.am)
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{DPRINTF(GDBRead, "Creating 32-bit GDB\n");
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return new SPARCGdbRegCache(this);}
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else
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{DPRINTF(GDBRead, "Creating 64-bit GDB\n");
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return new SPARC64GdbRegCache(this);}
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}
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