remote_gdb.cc revision 8332
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 The Regents of the University of California 33 * 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#include <unistd.h> 121 122#include <string> 123 124#include "config/full_system.hh" 125#if FULL_SYSTEM 126#include "arch/alpha/vtophys.hh" 127#endif 128 129#include "arch/alpha/kgdb.h" 130#include "arch/alpha/regredir.hh" 131#include "arch/alpha/remote_gdb.hh" 132#include "arch/alpha/utility.hh" 133#include "base/intmath.hh" 134#include "base/remote_gdb.hh" 135#include "base/socket.hh" 136#include "base/trace.hh" 137#include "cpu/static_inst.hh" 138#include "cpu/thread_context.hh" 139#include "debug/GDBAcc.hh" 140#include "debug/GDBMisc.hh" 141#include "mem/physical.hh" 142#include "mem/port.hh" 143#include "sim/system.hh" 144 145using namespace std; 146using namespace AlphaISA; 147 148RemoteGDB::RemoteGDB(System *_system, ThreadContext *tc) 149 : BaseRemoteGDB(_system, tc, KGDB_NUMREGS) 150{ 151 memset(gdbregs.regs, 0, gdbregs.bytes()); 152} 153 154/* 155 * Determine if the mapping at va..(va+len) is valid. 156 */ 157bool 158RemoteGDB::acc(Addr va, size_t len) 159{ 160#if !FULL_SYSTEM 161 panic("acc function needs to be rewritten for SE mode\n"); 162#else 163 Addr last_va; 164 165 va = TruncPage(va); 166 last_va = RoundPage(va + len); 167 168 do { 169 if (IsK0Seg(va)) { 170 if (va < (K0SegBase + pmem->size())) { 171 DPRINTF(GDBAcc, "acc: Mapping is valid K0SEG <= " 172 "%#x < K0SEG + size\n", va); 173 return true; 174 } else { 175 DPRINTF(GDBAcc, "acc: Mapping invalid %#x > K0SEG + size\n", 176 va); 177 return false; 178 } 179 } 180 181 /** 182 * This code says that all accesses to palcode (instruction 183 * and data) are valid since there isn't a va->pa mapping 184 * because palcode is accessed physically. At some point this 185 * should probably be cleaned up but there is no easy way to 186 * do it. 187 */ 188 189 if (PcPAL(va) || va < 0x10000) 190 return true; 191 192 Addr ptbr = context->readMiscRegNoEffect(IPR_PALtemp20); 193 PageTableEntry pte = 194 kernel_pte_lookup(context->getPhysPort(), ptbr, va); 195 if (!pte.valid()) { 196 DPRINTF(GDBAcc, "acc: %#x pte is invalid\n", va); 197 return false; 198 } 199 va += PageBytes; 200 } while (va < last_va); 201 202 DPRINTF(GDBAcc, "acc: %#x mapping is valid\n", va); 203 return true; 204#endif 205} 206 207/* 208 * Translate the kernel debugger register format into the GDB register 209 * format. 210 */ 211void 212RemoteGDB::getregs() 213{ 214 memset(gdbregs.regs, 0, gdbregs.bytes()); 215 216 gdbregs.regs[KGDB_REG_PC] = context->pcState().pc(); 217 218 // @todo: Currently this is very Alpha specific. 219 if (PcPAL(gdbregs.regs[KGDB_REG_PC])) { 220 for (int i = 0; i < NumIntArchRegs; ++i) { 221 gdbregs.regs[i] = context->readIntReg(reg_redir[i]); 222 } 223 } else { 224 for (int i = 0; i < NumIntArchRegs; ++i) { 225 gdbregs.regs[i] = context->readIntReg(i); 226 } 227 } 228 229#ifdef KGDB_FP_REGS 230 for (int i = 0; i < NumFloatArchRegs; ++i) { 231 gdbregs.regs[i + KGDB_REG_F0] = context->readFloatRegBits(i); 232 } 233#endif 234} 235 236/* 237 * Translate the GDB register format into the kernel debugger register 238 * format. 239 */ 240void 241RemoteGDB::setregs() 242{ 243 // @todo: Currently this is very Alpha specific. 244 if (PcPAL(gdbregs.regs[KGDB_REG_PC])) { 245 for (int i = 0; i < NumIntArchRegs; ++i) { 246 context->setIntReg(reg_redir[i], gdbregs.regs[i]); 247 } 248 } else { 249 for (int i = 0; i < NumIntArchRegs; ++i) { 250 context->setIntReg(i, gdbregs.regs[i]); 251 } 252 } 253 254#ifdef KGDB_FP_REGS 255 for (int i = 0; i < NumFloatArchRegs; ++i) { 256 context->setFloatRegBits(i, gdbregs.regs[i + KGDB_REG_F0]); 257 } 258#endif 259 context->pcState(gdbregs.regs[KGDB_REG_PC]); 260} 261 262void 263RemoteGDB::clearSingleStep() 264{ 265 DPRINTF(GDBMisc, "clearSingleStep bt_addr=%#x nt_addr=%#x\n", 266 takenBkpt, notTakenBkpt); 267 268 if (takenBkpt != 0) 269 clearTempBreakpoint(takenBkpt); 270 271 if (notTakenBkpt != 0) 272 clearTempBreakpoint(notTakenBkpt); 273} 274 275void 276RemoteGDB::setSingleStep() 277{ 278 PCState pc = context->pcState(); 279 PCState bpc; 280 bool set_bt = false; 281 282 // User was stopped at pc, e.g. the instruction at pc was not 283 // executed. 284 MachInst inst = read<MachInst>(pc.pc()); 285 StaticInstPtr si(inst, pc.pc()); 286 if (si->hasBranchTarget(pc, context, bpc)) { 287 // Don't bother setting a breakpoint on the taken branch if it 288 // is the same as the next pc 289 if (bpc.pc() != pc.npc()) 290 set_bt = true; 291 } 292 293 DPRINTF(GDBMisc, "setSingleStep bt_addr=%#x nt_addr=%#x\n", 294 takenBkpt, notTakenBkpt); 295 296 setTempBreakpoint(notTakenBkpt = pc.npc()); 297 298 if (set_bt) 299 setTempBreakpoint(takenBkpt = bpc.pc()); 300} 301 302// Write bytes to kernel address space for debugger. 303bool 304RemoteGDB::write(Addr vaddr, size_t size, const char *data) 305{ 306 if (BaseRemoteGDB::write(vaddr, size, data)) { 307#ifdef IMB 308 alpha_pal_imb(); 309#endif 310 return true; 311 } else { 312 return false; 313 } 314} 315 316