remote_gdb.cc revision 3550
1/* 2 * Copyright (c) 2002-2005 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Nathan Binkert 29 */ 30 31/* 32 * Copyright (c) 1990, 1993 33 * The Regents of the University of California. All rights reserved. 34 * 35 * This software was developed by the Computer Systems Engineering group 36 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 37 * contributed to Berkeley. 38 * 39 * All advertising materials mentioning features or use of this software 40 * must display the following acknowledgement: 41 * This product includes software developed by the University of 42 * California, Lawrence Berkeley Laboratories. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 1. Redistributions of source code must retain the above copyright 48 * notice, this list of conditions and the following disclaimer. 49 * 2. Redistributions in binary form must reproduce the above copyright 50 * notice, this list of conditions and the following disclaimer in the 51 * documentation and/or other materials provided with the distribution. 52 * 3. All advertising materials mentioning features or use of this software 53 * must display the following acknowledgement: 54 * This product includes software developed by the University of 55 * California, Berkeley and its contributors. 56 * 4. Neither the name of the University nor the names of its contributors 57 * may be used to endorse or promote products derived from this software 58 * without specific prior written permission. 59 * 60 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 61 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 62 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 63 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 64 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 65 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 66 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 67 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 68 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 69 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 70 * SUCH DAMAGE. 71 * 72 * @(#)kgdb_stub.c 8.4 (Berkeley) 1/12/94 73 */ 74 75/*- 76 * Copyright (c) 2001 The NetBSD Foundation, Inc. 77 * All rights reserved. 78 * 79 * This code is derived from software contributed to The NetBSD Foundation 80 * by Jason R. Thorpe. 81 * 82 * Redistribution and use in source and binary forms, with or without 83 * modification, are permitted provided that the following conditions 84 * are met: 85 * 1. Redistributions of source code must retain the above copyright 86 * notice, this list of conditions and the following disclaimer. 87 * 2. Redistributions in binary form must reproduce the above copyright 88 * notice, this list of conditions and the following disclaimer in the 89 * documentation and/or other materials provided with the distribution. 90 * 3. All advertising materials mentioning features or use of this software 91 * must display the following acknowledgement: 92 * This product includes software developed by the NetBSD 93 * Foundation, Inc. and its contributors. 94 * 4. Neither the name of The NetBSD Foundation nor the names of its 95 * contributors may be used to endorse or promote products derived 96 * from this software without specific prior written permission. 97 * 98 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 99 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 100 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 101 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 102 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 103 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 104 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 105 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 106 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 107 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 108 * POSSIBILITY OF SUCH DAMAGE. 109 */ 110 111/* 112 * $NetBSD: kgdb_stub.c,v 1.8 2001/07/07 22:58:00 wdk Exp $ 113 * 114 * Taken from NetBSD 115 * 116 * "Stub" to allow remote cpu to debug over a serial line using gdb. 117 */ 118 119#include <sys/signal.h> 120 121#include <string> 122#include <unistd.h> 123 124#include "arch/vtophys.hh" 125#include "arch/sparc/remote_gdb.hh" 126#include "base/intmath.hh" 127#include "base/remote_gdb.hh" 128#include "base/socket.hh" 129#include "base/trace.hh" 130#include "config/full_system.hh" 131#include "cpu/thread_context.hh" 132#include "cpu/static_inst.hh" 133#include "mem/physical.hh" 134#include "mem/port.hh" 135#include "sim/system.hh" 136 137using namespace std; 138using namespace TheISA; 139 140RemoteGDB::RemoteGDB(System *_system, ThreadContext *c) 141 : BaseRemoteGDB(_system, c, NumGDBRegs) 142{} 143 144/////////////////////////////////////////////////////////// 145// RemoteGDB::acc 146// 147// Determine if the mapping at va..(va+len) is valid. 148// 149bool 150RemoteGDB::acc(Addr va, size_t len) 151{ 152#if 0 153 Addr last_va; 154 155 va = TheISA::TruncPage(va); 156 last_va = TheISA::RoundPage(va + len); 157 158 do { 159 if (TheISA::IsK0Seg(va)) { 160 if (va < (TheISA::K0SegBase + pmem->size())) { 161 DPRINTF(GDBAcc, "acc: Mapping is valid K0SEG <= " 162 "%#x < K0SEG + size\n", va); 163 return true; 164 } else { 165 DPRINTF(GDBAcc, "acc: Mapping invalid %#x > K0SEG + size\n", 166 va); 167 return false; 168 } 169 } 170 171 /** 172 * This code says that all accesses to palcode (instruction and data) 173 * are valid since there isn't a va->pa mapping because palcode is 174 * accessed physically. At some point this should probably be cleaned up 175 * but there is no easy way to do it. 176 */ 177 178 if (AlphaISA::PcPAL(va) || va < 0x10000) 179 return true; 180 181 Addr ptbr = context->readMiscReg(AlphaISA::IPR_PALtemp20); 182 TheISA::PageTableEntry pte = TheISA::kernel_pte_lookup(context->getPhysPort(), ptbr, va); 183 if (!pte.valid()) { 184 DPRINTF(GDBAcc, "acc: %#x pte is invalid\n", va); 185 return false; 186 } 187 va += TheISA::PageBytes; 188 } while (va < last_va); 189 190 DPRINTF(GDBAcc, "acc: %#x mapping is valid\n", va); 191#endif 192 return true; 193} 194 195/////////////////////////////////////////////////////////// 196// RemoteGDB::getregs 197// 198// Translate the kernel debugger register format into 199// the GDB register format. 200void 201RemoteGDB::getregs() 202{ 203 memset(gdbregs.regs, 0, gdbregs.size); 204 205 gdbregs.regs[RegPc] = context->readPC(); 206 gdbregs.regs[RegNpc] = context->readNextPC(); 207 for(int x = RegG0; x <= RegI7; x++) 208 gdbregs.regs[x] = context->readIntReg(x - RegG0); 209 for(int x = RegF0; x <= RegF31; x++) 210 gdbregs.regs[x] = context->readFloatRegBits(x - RegF0); 211 gdbregs.regs[RegY] = context->readMiscReg(MISCREG_Y); 212 //XXX need to also load up Psr, Wim, Tbr, Fpsr, and Cpsr 213} 214 215/////////////////////////////////////////////////////////// 216// RemoteGDB::setregs 217// 218// Translate the GDB register format into the kernel 219// debugger register format. 220// 221void 222RemoteGDB::setregs() 223{ 224 context->setPC(gdbregs.regs[RegPc]); 225 context->setNextPC(gdbregs.regs[RegNpc]); 226 for(int x = RegG0; x <= RegI7; x++) 227 context->setIntReg(x - RegG0, gdbregs.regs[x]); 228 for(int x = RegF0; x <= RegF31; x++) 229 context->setFloatRegBits(x - RegF0, gdbregs.regs[x]); 230 context->setMiscRegWithEffect(MISCREG_Y, gdbregs.regs[RegY]); 231 //XXX need to also set Psr, Wim, Tbr, Fpsr, and Cpsr 232} 233 234void 235RemoteGDB::clearSingleStep() 236{ 237#if 0 238 DPRINTF(GDBMisc, "clearSingleStep bt_addr=%#x nt_addr=%#x\n", 239 takenBkpt.address, notTakenBkpt.address); 240 241 if (takenBkpt.address != 0) 242 clearTempBreakpoint(takenBkpt); 243 244 if (notTakenBkpt.address != 0) 245 clearTempBreakpoint(notTakenBkpt); 246#endif 247} 248 249void 250RemoteGDB::setSingleStep() 251{ 252#if 0 253 Addr pc = context->readPC(); 254 Addr npc, bpc; 255 bool set_bt = false; 256 257 npc = pc + sizeof(MachInst); 258 259 // User was stopped at pc, e.g. the instruction at pc was not 260 // executed. 261 MachInst inst = read<MachInst>(pc); 262 StaticInstPtr si(inst); 263 if (si->hasBranchTarget(pc, context, bpc)) { 264 // Don't bother setting a breakpoint on the taken branch if it 265 // is the same as the next pc 266 if (bpc != npc) 267 set_bt = true; 268 } 269 270 DPRINTF(GDBMisc, "setSingleStep bt_addr=%#x nt_addr=%#x\n", 271 takenBkpt.address, notTakenBkpt.address); 272 273 setTempBreakpoint(notTakenBkpt, npc); 274 275 if (set_bt) 276 setTempBreakpoint(takenBkpt, bpc); 277#endif 278} 279