remote_gdb.cc revision 3536
110389SAndreas.Sandberg@ARM.com/* 210389SAndreas.Sandberg@ARM.com * Copyright (c) 2002-2005 The Regents of The University of Michigan 310389SAndreas.Sandberg@ARM.com * All rights reserved. 410389SAndreas.Sandberg@ARM.com * 510389SAndreas.Sandberg@ARM.com * Redistribution and use in source and binary forms, with or without 610389SAndreas.Sandberg@ARM.com * modification, are permitted provided that the following conditions are 710389SAndreas.Sandberg@ARM.com * met: redistributions of source code must retain the above copyright 810389SAndreas.Sandberg@ARM.com * notice, this list of conditions and the following disclaimer; 910389SAndreas.Sandberg@ARM.com * redistributions in binary form must reproduce the above copyright 1010389SAndreas.Sandberg@ARM.com * notice, this list of conditions and the following disclaimer in the 1110389SAndreas.Sandberg@ARM.com * documentation and/or other materials provided with the distribution; 1210389SAndreas.Sandberg@ARM.com * neither the name of the copyright holders nor the names of its 1310389SAndreas.Sandberg@ARM.com * contributors may be used to endorse or promote products derived from 1410389SAndreas.Sandberg@ARM.com * this software without specific prior written permission. 1510389SAndreas.Sandberg@ARM.com * 1610389SAndreas.Sandberg@ARM.com * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 1710389SAndreas.Sandberg@ARM.com * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 1810389SAndreas.Sandberg@ARM.com * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 1910389SAndreas.Sandberg@ARM.com * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 2010389SAndreas.Sandberg@ARM.com * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 2110389SAndreas.Sandberg@ARM.com * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 2210389SAndreas.Sandberg@ARM.com * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2310389SAndreas.Sandberg@ARM.com * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2410389SAndreas.Sandberg@ARM.com * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2510389SAndreas.Sandberg@ARM.com * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 2610389SAndreas.Sandberg@ARM.com * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2710389SAndreas.Sandberg@ARM.com * 2810389SAndreas.Sandberg@ARM.com * Authors: Nathan Binkert 2910389SAndreas.Sandberg@ARM.com */ 3010389SAndreas.Sandberg@ARM.com 3110389SAndreas.Sandberg@ARM.com/* 3210389SAndreas.Sandberg@ARM.com * Copyright (c) 1990, 1993 3310389SAndreas.Sandberg@ARM.com * The Regents of the University of California. All rights reserved. 3410389SAndreas.Sandberg@ARM.com * 3510389SAndreas.Sandberg@ARM.com * This software was developed by the Computer Systems Engineering group 3610389SAndreas.Sandberg@ARM.com * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 3710389SAndreas.Sandberg@ARM.com * contributed to Berkeley. 3810389SAndreas.Sandberg@ARM.com * 3910389SAndreas.Sandberg@ARM.com * All advertising materials mentioning features or use of this software 4011793Sbrandon.potter@amd.com * must display the following acknowledgement: 4111793Sbrandon.potter@amd.com * This product includes software developed by the University of 4210389SAndreas.Sandberg@ARM.com * California, Lawrence Berkeley Laboratories. 4310389SAndreas.Sandberg@ARM.com * 4410389SAndreas.Sandberg@ARM.com * Redistribution and use in source and binary forms, with or without 4510389SAndreas.Sandberg@ARM.com * modification, are permitted provided that the following conditions 4610389SAndreas.Sandberg@ARM.com * are met: 4710389SAndreas.Sandberg@ARM.com * 1. Redistributions of source code must retain the above copyright 4810389SAndreas.Sandberg@ARM.com * notice, this list of conditions and the following disclaimer. 4910389SAndreas.Sandberg@ARM.com * 2. Redistributions in binary form must reproduce the above copyright 5012237Sandreas.sandberg@arm.com * notice, this list of conditions and the following disclaimer in the 5110389SAndreas.Sandberg@ARM.com * documentation and/or other materials provided with the distribution. 5210389SAndreas.Sandberg@ARM.com * 3. All advertising materials mentioning features or use of this software 5310389SAndreas.Sandberg@ARM.com * must display the following acknowledgement: 5410389SAndreas.Sandberg@ARM.com * This product includes software developed by the University of 5510389SAndreas.Sandberg@ARM.com * California, Berkeley and its contributors. 5610389SAndreas.Sandberg@ARM.com * 4. Neither the name of the University nor the names of its contributors 5710389SAndreas.Sandberg@ARM.com * may be used to endorse or promote products derived from this software 5812237Sandreas.sandberg@arm.com * without specific prior written permission. 5910389SAndreas.Sandberg@ARM.com * 6010389SAndreas.Sandberg@ARM.com * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 6110389SAndreas.Sandberg@ARM.com * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 6210389SAndreas.Sandberg@ARM.com * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 6310389SAndreas.Sandberg@ARM.com * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 6410389SAndreas.Sandberg@ARM.com * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 6510389SAndreas.Sandberg@ARM.com * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 6610389SAndreas.Sandberg@ARM.com * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 6710389SAndreas.Sandberg@ARM.com * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 6810389SAndreas.Sandberg@ARM.com * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 6910389SAndreas.Sandberg@ARM.com * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 7010389SAndreas.Sandberg@ARM.com * SUCH DAMAGE. 7110389SAndreas.Sandberg@ARM.com * 7210389SAndreas.Sandberg@ARM.com * @(#)kgdb_stub.c 8.4 (Berkeley) 1/12/94 7310389SAndreas.Sandberg@ARM.com */ 7410389SAndreas.Sandberg@ARM.com 7510389SAndreas.Sandberg@ARM.com/*- 7610389SAndreas.Sandberg@ARM.com * Copyright (c) 2001 The NetBSD Foundation, Inc. 7710389SAndreas.Sandberg@ARM.com * All rights reserved. 7810389SAndreas.Sandberg@ARM.com * 7910389SAndreas.Sandberg@ARM.com * This code is derived from software contributed to The NetBSD Foundation 8010389SAndreas.Sandberg@ARM.com * by Jason R. Thorpe. 8110389SAndreas.Sandberg@ARM.com * 8210389SAndreas.Sandberg@ARM.com * Redistribution and use in source and binary forms, with or without 8310389SAndreas.Sandberg@ARM.com * modification, are permitted provided that the following conditions 8412237Sandreas.sandberg@arm.com * are met: 8510389SAndreas.Sandberg@ARM.com * 1. Redistributions of source code must retain the above copyright 8610389SAndreas.Sandberg@ARM.com * notice, this list of conditions and the following disclaimer. 8712237Sandreas.sandberg@arm.com * 2. Redistributions in binary form must reproduce the above copyright 8812237Sandreas.sandberg@arm.com * notice, this list of conditions and the following disclaimer in the 8910389SAndreas.Sandberg@ARM.com * documentation and/or other materials provided with the distribution. 9010389SAndreas.Sandberg@ARM.com * 3. All advertising materials mentioning features or use of this software 9110389SAndreas.Sandberg@ARM.com * must display the following acknowledgement: 9210389SAndreas.Sandberg@ARM.com * This product includes software developed by the NetBSD 9310389SAndreas.Sandberg@ARM.com * Foundation, Inc. and its contributors. 9410389SAndreas.Sandberg@ARM.com * 4. Neither the name of The NetBSD Foundation nor the names of its 9510389SAndreas.Sandberg@ARM.com * contributors may be used to endorse or promote products derived 9610389SAndreas.Sandberg@ARM.com * from this software without specific prior written permission. 9710389SAndreas.Sandberg@ARM.com * 9810389SAndreas.Sandberg@ARM.com * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 9910389SAndreas.Sandberg@ARM.com * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 10010389SAndreas.Sandberg@ARM.com * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 10110389SAndreas.Sandberg@ARM.com * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 10210389SAndreas.Sandberg@ARM.com * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 10310389SAndreas.Sandberg@ARM.com * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 10410389SAndreas.Sandberg@ARM.com * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 10510389SAndreas.Sandberg@ARM.com * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 10610389SAndreas.Sandberg@ARM.com * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 10710389SAndreas.Sandberg@ARM.com * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 10810389SAndreas.Sandberg@ARM.com * POSSIBILITY OF SUCH DAMAGE. 10910389SAndreas.Sandberg@ARM.com */ 11010389SAndreas.Sandberg@ARM.com 11112237Sandreas.sandberg@arm.com/* 11210389SAndreas.Sandberg@ARM.com * $NetBSD: kgdb_stub.c,v 1.8 2001/07/07 22:58:00 wdk Exp $ 11310389SAndreas.Sandberg@ARM.com * 11410389SAndreas.Sandberg@ARM.com * Taken from NetBSD 11510389SAndreas.Sandberg@ARM.com * 11610389SAndreas.Sandberg@ARM.com * "Stub" to allow remote cpu to debug over a serial line using gdb. 11710389SAndreas.Sandberg@ARM.com */ 11810389SAndreas.Sandberg@ARM.com 11910389SAndreas.Sandberg@ARM.com#include <sys/signal.h> 12010389SAndreas.Sandberg@ARM.com 12110389SAndreas.Sandberg@ARM.com#include <string> 12210389SAndreas.Sandberg@ARM.com#include <unistd.h> 123 124#include "arch/vtophys.hh" 125#include "arch/alpha/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 AlphaISA; 139 140RemoteGDB::Event::Event(RemoteGDB *g, int fd, int e) 141 : PollEvent(fd, e), gdb(g) 142{} 143 144void 145RemoteGDB::Event::process(int revent) 146{ 147 if (revent & POLLIN) 148 gdb->trap(ALPHA_KENTRY_IF); 149 else if (revent & POLLNVAL) 150 gdb->detach(); 151} 152 153RemoteGDB::RemoteGDB(System *_system, ThreadContext *c) 154 : BaseRemoteGDB(_system, c, KGDB_NUMREGS), 155 event(NULL) 156{} 157 158RemoteGDB::~RemoteGDB() 159{ 160 if (event) 161 delete event; 162} 163 164/////////////////////////////////////////////////////////// 165// RemoteGDB::acc 166// 167// Determine if the mapping at va..(va+len) is valid. 168// 169bool 170RemoteGDB::acc(Addr va, size_t len) 171{ 172 Addr last_va; 173 174 va = TheISA::TruncPage(va); 175 last_va = TheISA::RoundPage(va + len); 176 177 do { 178 if (TheISA::IsK0Seg(va)) { 179 if (va < (TheISA::K0SegBase + pmem->size())) { 180 DPRINTF(GDBAcc, "acc: Mapping is valid K0SEG <= " 181 "%#x < K0SEG + size\n", va); 182 return true; 183 } else { 184 DPRINTF(GDBAcc, "acc: Mapping invalid %#x > K0SEG + size\n", 185 va); 186 return false; 187 } 188 } 189 190 /** 191 * This code says that all accesses to palcode (instruction and data) 192 * are valid since there isn't a va->pa mapping because palcode is 193 * accessed physically. At some point this should probably be cleaned up 194 * but there is no easy way to do it. 195 */ 196 197 if (AlphaISA::PcPAL(va) || va < 0x10000) 198 return true; 199 200 Addr ptbr = context->readMiscReg(AlphaISA::IPR_PALtemp20); 201 TheISA::PageTableEntry pte = TheISA::kernel_pte_lookup(context->getPhysPort(), ptbr, va); 202 if (!pte.valid()) { 203 DPRINTF(GDBAcc, "acc: %#x pte is invalid\n", va); 204 return false; 205 } 206 va += TheISA::PageBytes; 207 } while (va < last_va); 208 209 DPRINTF(GDBAcc, "acc: %#x mapping is valid\n", va); 210 return true; 211} 212 213/////////////////////////////////////////////////////////// 214// RemoteGDB::getregs 215// 216// Translate the kernel debugger register format into 217// the GDB register format. 218void 219RemoteGDB::getregs() 220{ 221 memset(gdbregs.regs, 0, gdbregs.size); 222 223 gdbregs.regs[KGDB_REG_PC] = context->readPC(); 224 225 // @todo: Currently this is very Alpha specific. 226 if (AlphaISA::PcPAL(gdbregs.regs[KGDB_REG_PC])) { 227 for (int i = 0; i < TheISA::NumIntArchRegs; ++i) { 228 gdbregs.regs[i] = context->readIntReg(AlphaISA::reg_redir[i]); 229 } 230 } else { 231 for (int i = 0; i < TheISA::NumIntArchRegs; ++i) { 232 gdbregs.regs[i] = context->readIntReg(i); 233 } 234 } 235 236#ifdef KGDB_FP_REGS 237 for (int i = 0; i < TheISA::NumFloatArchRegs; ++i) { 238 gdbregs.regs[i + KGDB_REG_F0] = context->readFloatRegBits(i); 239 } 240#endif 241} 242 243/////////////////////////////////////////////////////////// 244// RemoteGDB::setregs 245// 246// Translate the GDB register format into the kernel 247// debugger register format. 248// 249void 250RemoteGDB::setregs() 251{ 252 // @todo: Currently this is very Alpha specific. 253 if (AlphaISA::PcPAL(gdbregs.regs[KGDB_REG_PC])) { 254 for (int i = 0; i < TheISA::NumIntArchRegs; ++i) { 255 context->setIntReg(AlphaISA::reg_redir[i], gdbregs.regs[i]); 256 } 257 } else { 258 for (int i = 0; i < TheISA::NumIntArchRegs; ++i) { 259 context->setIntReg(i, gdbregs.regs[i]); 260 } 261 } 262 263#ifdef KGDB_FP_REGS 264 for (int i = 0; i < TheISA::NumFloatArchRegs; ++i) { 265 context->setFloatRegBits(i, gdbregs.regs[i + KGDB_REG_F0]); 266 } 267#endif 268 context->setPC(gdbregs.regs[KGDB_REG_PC]); 269} 270 271void 272RemoteGDB::setTempBreakpoint(TempBreakpoint &bkpt, Addr addr) 273{ 274 DPRINTF(GDBMisc, "setTempBreakpoint: addr=%#x\n", addr); 275 276 bkpt.address = addr; 277 insertHardBreak(addr, 4); 278} 279 280void 281RemoteGDB::clearTempBreakpoint(TempBreakpoint &bkpt) 282{ 283 DPRINTF(GDBMisc, "setTempBreakpoint: addr=%#x\n", 284 bkpt.address); 285 286 287 removeHardBreak(bkpt.address, 4); 288 bkpt.address = 0; 289} 290 291void 292RemoteGDB::clearSingleStep() 293{ 294 DPRINTF(GDBMisc, "clearSingleStep bt_addr=%#x nt_addr=%#x\n", 295 takenBkpt.address, notTakenBkpt.address); 296 297 if (takenBkpt.address != 0) 298 clearTempBreakpoint(takenBkpt); 299 300 if (notTakenBkpt.address != 0) 301 clearTempBreakpoint(notTakenBkpt); 302} 303 304void 305RemoteGDB::setSingleStep() 306{ 307 Addr pc = context->readPC(); 308 Addr npc, bpc; 309 bool set_bt = false; 310 311 npc = pc + sizeof(MachInst); 312 313 // User was stopped at pc, e.g. the instruction at pc was not 314 // executed. 315 MachInst inst = read<MachInst>(pc); 316 StaticInstPtr si(inst); 317 if (si->hasBranchTarget(pc, context, bpc)) { 318 // Don't bother setting a breakpoint on the taken branch if it 319 // is the same as the next pc 320 if (bpc != npc) 321 set_bt = true; 322 } 323 324 DPRINTF(GDBMisc, "setSingleStep bt_addr=%#x nt_addr=%#x\n", 325 takenBkpt.address, notTakenBkpt.address); 326 327 setTempBreakpoint(notTakenBkpt, npc); 328 329 if (set_bt) 330 setTempBreakpoint(takenBkpt, bpc); 331} 332 333// Write bytes to kernel address space for debugger. 334bool 335RemoteGDB::write(Addr vaddr, size_t size, const char *data) 336{ 337 if (BaseRemoteGDB::write(vaddr, size, data)) { 338#ifdef IMB 339 alpha_pal_imb(); 340#endif 341 return true; 342 } else { 343 return false; 344 } 345} 346 347 348PCEventQueue *RemoteGDB::getPcEventQueue() 349{ 350 return &system->pcEventQueue; 351} 352 353 354RemoteGDB::HardBreakpoint::HardBreakpoint(RemoteGDB *_gdb, Addr pc) 355 : PCEvent(_gdb->getPcEventQueue(), "HardBreakpoint Event", pc), 356 gdb(_gdb), refcount(0) 357{ 358 DPRINTF(GDBMisc, "creating hardware breakpoint at %#x\n", evpc); 359} 360 361void 362RemoteGDB::HardBreakpoint::process(ThreadContext *tc) 363{ 364 DPRINTF(GDBMisc, "handling hardware breakpoint at %#x\n", pc()); 365 366 if (tc == gdb->context) 367 gdb->trap(ALPHA_KENTRY_INT); 368} 369 370bool 371RemoteGDB::insertSoftBreak(Addr addr, size_t len) 372{ 373 if (len != sizeof(MachInst)) 374 panic("invalid length\n"); 375 376 return insertHardBreak(addr, len); 377} 378 379bool 380RemoteGDB::removeSoftBreak(Addr addr, size_t len) 381{ 382 if (len != sizeof(MachInst)) 383 panic("invalid length\n"); 384 385 return removeHardBreak(addr, len); 386} 387 388bool 389RemoteGDB::insertHardBreak(Addr addr, size_t len) 390{ 391 if (len != sizeof(MachInst)) 392 panic("invalid length\n"); 393 394 DPRINTF(GDBMisc, "inserting hardware breakpoint at %#x\n", addr); 395 396 HardBreakpoint *&bkpt = hardBreakMap[addr]; 397 if (bkpt == 0) 398 bkpt = new HardBreakpoint(this, addr); 399 400 bkpt->refcount++; 401 402 return true; 403} 404 405bool 406RemoteGDB::removeHardBreak(Addr addr, size_t len) 407{ 408 if (len != sizeof(MachInst)) 409 panic("invalid length\n"); 410 411 DPRINTF(GDBMisc, "removing hardware breakpoint at %#x\n", addr); 412 413 break_iter_t i = hardBreakMap.find(addr); 414 if (i == hardBreakMap.end()) 415 return false; 416 417 HardBreakpoint *hbp = (*i).second; 418 if (--hbp->refcount == 0) { 419 delete hbp; 420 hardBreakMap.erase(i); 421 } 422 423 return true; 424} 425