remote_gdb.cc revision 3550:515e876568b4
112391Sjason@lowepower.com/* 214299Sbbruce@ucdavis.edu * Copyright (c) 2002-2005 The Regents of The University of Michigan 314299Sbbruce@ucdavis.edu * All rights reserved. 414299Sbbruce@ucdavis.edu * 514299Sbbruce@ucdavis.edu * Redistribution and use in source and binary forms, with or without 614299Sbbruce@ucdavis.edu * modification, are permitted provided that the following conditions are 714299Sbbruce@ucdavis.edu * met: redistributions of source code must retain the above copyright 814299Sbbruce@ucdavis.edu * notice, this list of conditions and the following disclaimer; 912391Sjason@lowepower.com * redistributions in binary form must reproduce the above copyright 1012391Sjason@lowepower.com * notice, this list of conditions and the following disclaimer in the 1112391Sjason@lowepower.com * documentation and/or other materials provided with the distribution; 1212391Sjason@lowepower.com * neither the name of the copyright holders nor the names of its 1312391Sjason@lowepower.com * contributors may be used to endorse or promote products derived from 1412391Sjason@lowepower.com * this software without specific prior written permission. 1512391Sjason@lowepower.com * 1612391Sjason@lowepower.com * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 1712391Sjason@lowepower.com * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 1812391Sjason@lowepower.com * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 1912391Sjason@lowepower.com * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 2012391Sjason@lowepower.com * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 2112391Sjason@lowepower.com * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 2212391Sjason@lowepower.com * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2312391Sjason@lowepower.com * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2412391Sjason@lowepower.com * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2512391Sjason@lowepower.com * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 2612391Sjason@lowepower.com * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2712391Sjason@lowepower.com * 2812391Sjason@lowepower.com * Authors: Nathan Binkert 2912391Sjason@lowepower.com */ 3012391Sjason@lowepower.com 3112391Sjason@lowepower.com/* 3212391Sjason@lowepower.com * Copyright (c) 1990, 1993 3312391Sjason@lowepower.com * The Regents of the University of California. All rights reserved. 3412391Sjason@lowepower.com * 3512391Sjason@lowepower.com * This software was developed by the Computer Systems Engineering group 3612391Sjason@lowepower.com * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 3712391Sjason@lowepower.com * contributed to Berkeley. 3812391Sjason@lowepower.com * 3912391Sjason@lowepower.com * All advertising materials mentioning features or use of this software 4012391Sjason@lowepower.com * must display the following acknowledgement: 4112391Sjason@lowepower.com * This product includes software developed by the University of 4212391Sjason@lowepower.com * California, Lawrence Berkeley Laboratories. 4312391Sjason@lowepower.com * 4412391Sjason@lowepower.com * Redistribution and use in source and binary forms, with or without 4512391Sjason@lowepower.com * modification, are permitted provided that the following conditions 4612391Sjason@lowepower.com * are met: 4712391Sjason@lowepower.com * 1. Redistributions of source code must retain the above copyright 4812391Sjason@lowepower.com * notice, this list of conditions and the following disclaimer. 4912391Sjason@lowepower.com * 2. Redistributions in binary form must reproduce the above copyright 5012391Sjason@lowepower.com * notice, this list of conditions and the following disclaimer in the 5112391Sjason@lowepower.com * documentation and/or other materials provided with the distribution. 5212391Sjason@lowepower.com * 3. All advertising materials mentioning features or use of this software 5312391Sjason@lowepower.com * must display the following acknowledgement: 5412391Sjason@lowepower.com * This product includes software developed by the University of 5512391Sjason@lowepower.com * California, Berkeley and its contributors. 5612391Sjason@lowepower.com * 4. Neither the name of the University nor the names of its contributors 5712391Sjason@lowepower.com * may be used to endorse or promote products derived from this software 5812391Sjason@lowepower.com * without specific prior written permission. 5912391Sjason@lowepower.com * 6012391Sjason@lowepower.com * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 6112391Sjason@lowepower.com * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 6212391Sjason@lowepower.com * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 6312391Sjason@lowepower.com * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 6412391Sjason@lowepower.com * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 6512391Sjason@lowepower.com * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 6612391Sjason@lowepower.com * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 6712391Sjason@lowepower.com * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 6812391Sjason@lowepower.com * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 6912391Sjason@lowepower.com * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 7012391Sjason@lowepower.com * SUCH DAMAGE. 7112391Sjason@lowepower.com * 7212391Sjason@lowepower.com * @(#)kgdb_stub.c 8.4 (Berkeley) 1/12/94 7312391Sjason@lowepower.com */ 7412391Sjason@lowepower.com 7512391Sjason@lowepower.com/*- 7612391Sjason@lowepower.com * Copyright (c) 2001 The NetBSD Foundation, Inc. 7712391Sjason@lowepower.com * All rights reserved. 7812391Sjason@lowepower.com * 7912391Sjason@lowepower.com * This code is derived from software contributed to The NetBSD Foundation 8012391Sjason@lowepower.com * by Jason R. Thorpe. 8112391Sjason@lowepower.com * 8212391Sjason@lowepower.com * Redistribution and use in source and binary forms, with or without 8312391Sjason@lowepower.com * modification, are permitted provided that the following conditions 8412391Sjason@lowepower.com * are met: 8512391Sjason@lowepower.com * 1. Redistributions of source code must retain the above copyright 8612391Sjason@lowepower.com * notice, this list of conditions and the following disclaimer. 8712391Sjason@lowepower.com * 2. Redistributions in binary form must reproduce the above copyright 8812391Sjason@lowepower.com * notice, this list of conditions and the following disclaimer in the 8912391Sjason@lowepower.com * documentation and/or other materials provided with the distribution. 9012391Sjason@lowepower.com * 3. All advertising materials mentioning features or use of this software 9112391Sjason@lowepower.com * must display the following acknowledgement: 9212391Sjason@lowepower.com * This product includes software developed by the NetBSD 9312391Sjason@lowepower.com * Foundation, Inc. and its contributors. 9412391Sjason@lowepower.com * 4. Neither the name of The NetBSD Foundation nor the names of its 9512391Sjason@lowepower.com * contributors may be used to endorse or promote products derived 9612391Sjason@lowepower.com * from this software without specific prior written permission. 9712391Sjason@lowepower.com * 9812391Sjason@lowepower.com * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 9912391Sjason@lowepower.com * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 10012391Sjason@lowepower.com * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 10112391Sjason@lowepower.com * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 10212391Sjason@lowepower.com * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 10312391Sjason@lowepower.com * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 10414299Sbbruce@ucdavis.edu * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 10514299Sbbruce@ucdavis.edu * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 10612391Sjason@lowepower.com * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 10712391Sjason@lowepower.com * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 10812391Sjason@lowepower.com * POSSIBILITY OF SUCH DAMAGE. 10912391Sjason@lowepower.com */ 11012391Sjason@lowepower.com 11112391Sjason@lowepower.com/* 11212391Sjason@lowepower.com * $NetBSD: kgdb_stub.c,v 1.8 2001/07/07 22:58:00 wdk Exp $ 11314299Sbbruce@ucdavis.edu * 11414299Sbbruce@ucdavis.edu * Taken from NetBSD 11514299Sbbruce@ucdavis.edu * 11614299Sbbruce@ucdavis.edu * "Stub" to allow remote cpu to debug over a serial line using gdb. 11714299Sbbruce@ucdavis.edu */ 11812391Sjason@lowepower.com 11912391Sjason@lowepower.com#include <sys/signal.h> 12012391Sjason@lowepower.com 12112391Sjason@lowepower.com#include <string> 12212391Sjason@lowepower.com#include <unistd.h> 12312391Sjason@lowepower.com 12412391Sjason@lowepower.com#include "arch/alpha/kgdb.h" 12512391Sjason@lowepower.com#include "arch/alpha/remote_gdb.hh" 12612391Sjason@lowepower.com#include "arch/vtophys.hh" 12712391Sjason@lowepower.com#include "base/intmath.hh" 12812391Sjason@lowepower.com#include "base/remote_gdb.hh" 12912391Sjason@lowepower.com#include "base/socket.hh" 13012391Sjason@lowepower.com#include "base/trace.hh" 13112391Sjason@lowepower.com#include "config/full_system.hh" 13214299Sbbruce@ucdavis.edu#include "cpu/thread_context.hh" 13314299Sbbruce@ucdavis.edu#include "cpu/static_inst.hh" 13412391Sjason@lowepower.com#include "mem/physical.hh" 13512391Sjason@lowepower.com#include "mem/port.hh" 13612391Sjason@lowepower.com#include "sim/system.hh" 13712391Sjason@lowepower.com 13812391Sjason@lowepower.comusing namespace std; 13912391Sjason@lowepower.comusing namespace TheISA; 14012391Sjason@lowepower.com 14112391Sjason@lowepower.comRemoteGDB::RemoteGDB(System *_system, ThreadContext *c) 14212391Sjason@lowepower.com : BaseRemoteGDB(_system, c, KGDB_NUMREGS) 14312391Sjason@lowepower.com{ 14412391Sjason@lowepower.com memset(gdbregs.regs, 0, gdbregs.size); 14512391Sjason@lowepower.com} 14612391Sjason@lowepower.com 14712391Sjason@lowepower.com/////////////////////////////////////////////////////////// 14812391Sjason@lowepower.com// RemoteGDB::acc 14912391Sjason@lowepower.com// 15012391Sjason@lowepower.com// Determine if the mapping at va..(va+len) is valid. 15112391Sjason@lowepower.com// 15212391Sjason@lowepower.combool 15312391Sjason@lowepower.comRemoteGDB::acc(Addr va, size_t len) 15412391Sjason@lowepower.com{ 15512391Sjason@lowepower.com Addr last_va; 15612391Sjason@lowepower.com 15712391Sjason@lowepower.com va = TheISA::TruncPage(va); 15812391Sjason@lowepower.com last_va = TheISA::RoundPage(va + len); 15912391Sjason@lowepower.com 16012391Sjason@lowepower.com do { 16112391Sjason@lowepower.com if (TheISA::IsK0Seg(va)) { 16212391Sjason@lowepower.com if (va < (TheISA::K0SegBase + pmem->size())) { 16312391Sjason@lowepower.com DPRINTF(GDBAcc, "acc: Mapping is valid K0SEG <= " 16412391Sjason@lowepower.com "%#x < K0SEG + size\n", va); 16512391Sjason@lowepower.com return true; 16612391Sjason@lowepower.com } else { 16712391Sjason@lowepower.com DPRINTF(GDBAcc, "acc: Mapping invalid %#x > K0SEG + size\n", 16812391Sjason@lowepower.com va); 16912391Sjason@lowepower.com return false; 17012391Sjason@lowepower.com } 17112391Sjason@lowepower.com } 17212391Sjason@lowepower.com 17312391Sjason@lowepower.com /** 17412391Sjason@lowepower.com * This code says that all accesses to palcode (instruction and data) 17512391Sjason@lowepower.com * are valid since there isn't a va->pa mapping because palcode is 17612391Sjason@lowepower.com * accessed physically. At some point this should probably be cleaned up 17712391Sjason@lowepower.com * but there is no easy way to do it. 17812391Sjason@lowepower.com */ 17912391Sjason@lowepower.com 18012391Sjason@lowepower.com if (AlphaISA::PcPAL(va) || va < 0x10000) 18112391Sjason@lowepower.com return true; 18212391Sjason@lowepower.com 18312391Sjason@lowepower.com Addr ptbr = context->readMiscReg(AlphaISA::IPR_PALtemp20); 18412391Sjason@lowepower.com TheISA::PageTableEntry pte = TheISA::kernel_pte_lookup(context->getPhysPort(), ptbr, va); 18512391Sjason@lowepower.com if (!pte.valid()) { 18612391Sjason@lowepower.com DPRINTF(GDBAcc, "acc: %#x pte is invalid\n", va); 18712391Sjason@lowepower.com return false; 18812391Sjason@lowepower.com } 18912391Sjason@lowepower.com va += TheISA::PageBytes; 19012391Sjason@lowepower.com } while (va < last_va); 19112391Sjason@lowepower.com 19212391Sjason@lowepower.com DPRINTF(GDBAcc, "acc: %#x mapping is valid\n", va); 19312391Sjason@lowepower.com return true; 19412391Sjason@lowepower.com} 19512391Sjason@lowepower.com 19612391Sjason@lowepower.com/////////////////////////////////////////////////////////// 19712391Sjason@lowepower.com// RemoteGDB::getregs 19812391Sjason@lowepower.com// 19912391Sjason@lowepower.com// Translate the kernel debugger register format into 20012391Sjason@lowepower.com// the GDB register format. 20112391Sjason@lowepower.comvoid 20212391Sjason@lowepower.comRemoteGDB::getregs() 20312391Sjason@lowepower.com{ 20412391Sjason@lowepower.com memset(gdbregs.regs, 0, gdbregs.size); 20512391Sjason@lowepower.com 20612391Sjason@lowepower.com gdbregs.regs[KGDB_REG_PC] = context->readPC(); 20712391Sjason@lowepower.com 20812391Sjason@lowepower.com // @todo: Currently this is very Alpha specific. 20912391Sjason@lowepower.com if (AlphaISA::PcPAL(gdbregs.regs[KGDB_REG_PC])) { 21012391Sjason@lowepower.com for (int i = 0; i < TheISA::NumIntArchRegs; ++i) { 21112391Sjason@lowepower.com gdbregs.regs[i] = context->readIntReg(AlphaISA::reg_redir[i]); 21212391Sjason@lowepower.com } 21312391Sjason@lowepower.com } else { 21412391Sjason@lowepower.com for (int i = 0; i < TheISA::NumIntArchRegs; ++i) { 21512391Sjason@lowepower.com gdbregs.regs[i] = context->readIntReg(i); 21612391Sjason@lowepower.com } 21712391Sjason@lowepower.com } 21812391Sjason@lowepower.com 21912391Sjason@lowepower.com#ifdef KGDB_FP_REGS 22012391Sjason@lowepower.com for (int i = 0; i < TheISA::NumFloatArchRegs; ++i) { 22112391Sjason@lowepower.com gdbregs.regs[i + KGDB_REG_F0] = context->readFloatRegBits(i); 22212391Sjason@lowepower.com } 22312391Sjason@lowepower.com#endif 22412391Sjason@lowepower.com} 22512391Sjason@lowepower.com 22612391Sjason@lowepower.com/////////////////////////////////////////////////////////// 22712391Sjason@lowepower.com// RemoteGDB::setregs 22812391Sjason@lowepower.com// 22912391Sjason@lowepower.com// Translate the GDB register format into the kernel 23012391Sjason@lowepower.com// debugger register format. 23112391Sjason@lowepower.com// 23212391Sjason@lowepower.comvoid 23312391Sjason@lowepower.comRemoteGDB::setregs() 23412391Sjason@lowepower.com{ 23512391Sjason@lowepower.com // @todo: Currently this is very Alpha specific. 23612391Sjason@lowepower.com if (AlphaISA::PcPAL(gdbregs.regs[KGDB_REG_PC])) { 23712391Sjason@lowepower.com for (int i = 0; i < TheISA::NumIntArchRegs; ++i) { 23812391Sjason@lowepower.com context->setIntReg(AlphaISA::reg_redir[i], gdbregs.regs[i]); 23912391Sjason@lowepower.com } 24012391Sjason@lowepower.com } else { 24112391Sjason@lowepower.com for (int i = 0; i < TheISA::NumIntArchRegs; ++i) { 24212391Sjason@lowepower.com context->setIntReg(i, gdbregs.regs[i]); 24312391Sjason@lowepower.com } 24412391Sjason@lowepower.com } 24512391Sjason@lowepower.com 24612391Sjason@lowepower.com#ifdef KGDB_FP_REGS 24712391Sjason@lowepower.com for (int i = 0; i < TheISA::NumFloatArchRegs; ++i) { 24812391Sjason@lowepower.com context->setFloatRegBits(i, gdbregs.regs[i + KGDB_REG_F0]); 24912391Sjason@lowepower.com } 25012391Sjason@lowepower.com#endif 25112391Sjason@lowepower.com context->setPC(gdbregs.regs[KGDB_REG_PC]); 25212391Sjason@lowepower.com} 25312391Sjason@lowepower.com 25412391Sjason@lowepower.comvoid 25512391Sjason@lowepower.comRemoteGDB::clearSingleStep() 25612391Sjason@lowepower.com{ 25712391Sjason@lowepower.com DPRINTF(GDBMisc, "clearSingleStep bt_addr=%#x nt_addr=%#x\n", 25812391Sjason@lowepower.com takenBkpt, notTakenBkpt); 25912391Sjason@lowepower.com 26012391Sjason@lowepower.com if (takenBkpt != 0) 26112391Sjason@lowepower.com clearTempBreakpoint(takenBkpt); 26212391Sjason@lowepower.com 26312391Sjason@lowepower.com if (notTakenBkpt != 0) 26412391Sjason@lowepower.com clearTempBreakpoint(notTakenBkpt); 26512391Sjason@lowepower.com} 26612391Sjason@lowepower.com 26712391Sjason@lowepower.comvoid 26812391Sjason@lowepower.comRemoteGDB::setSingleStep() 26912391Sjason@lowepower.com{ 27012391Sjason@lowepower.com Addr pc = context->readPC(); 27112391Sjason@lowepower.com Addr npc, bpc; 27212391Sjason@lowepower.com bool set_bt = false; 27312391Sjason@lowepower.com 27412391Sjason@lowepower.com npc = pc + sizeof(MachInst); 27512391Sjason@lowepower.com 27612391Sjason@lowepower.com // User was stopped at pc, e.g. the instruction at pc was not 27712391Sjason@lowepower.com // executed. 27812391Sjason@lowepower.com MachInst inst = read<MachInst>(pc); 27912391Sjason@lowepower.com StaticInstPtr si(inst); 28012391Sjason@lowepower.com if (si->hasBranchTarget(pc, context, bpc)) { 28112391Sjason@lowepower.com // Don't bother setting a breakpoint on the taken branch if it 28212391Sjason@lowepower.com // is the same as the next pc 28312391Sjason@lowepower.com if (bpc != npc) 28412391Sjason@lowepower.com set_bt = true; 285 } 286 287 DPRINTF(GDBMisc, "setSingleStep bt_addr=%#x nt_addr=%#x\n", 288 takenBkpt, notTakenBkpt); 289 290 setTempBreakpoint(notTakenBkpt = npc); 291 292 if (set_bt) 293 setTempBreakpoint(takenBkpt = bpc); 294} 295 296// Write bytes to kernel address space for debugger. 297bool 298RemoteGDB::write(Addr vaddr, size_t size, const char *data) 299{ 300 if (BaseRemoteGDB::write(vaddr, size, data)) { 301#ifdef IMB 302 alpha_pal_imb(); 303#endif 304 return true; 305 } else { 306 return false; 307 } 308} 309 310