remote_gdb.cc revision 3536
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/kgdb.h" 128#include "base/remote_gdb.hh" 129#include "base/socket.hh" 130#include "base/trace.hh" 131#include "config/full_system.hh" 132#include "cpu/thread_context.hh" 133#include "cpu/static_inst.hh" 134#include "mem/physical.hh" 135#include "mem/port.hh" 136#include "sim/system.hh" 137 138using namespace std; 139using namespace TheISA; 140 141RemoteGDB::Event::Event(RemoteGDB *g, int fd, int e) 142 : PollEvent(fd, e), gdb(g) 143{} 144 145void 146RemoteGDB::Event::process(int revent) 147{ 148 if (revent & POLLIN) 149 gdb->trap(ALPHA_KENTRY_IF); 150 else if (revent & POLLNVAL) 151 gdb->detach(); 152} 153 154RemoteGDB::RemoteGDB(System *_system, ThreadContext *c) 155 : BaseRemoteGDB(_system, c, KGDB_NUMREGS), 156 event(NULL) 157{} 158 159RemoteGDB::~RemoteGDB() 160{ 161 if (event) 162 delete event; 163} 164 165/////////////////////////////////////////////////////////// 166// RemoteGDB::acc 167// 168// Determine if the mapping at va..(va+len) is valid. 169// 170bool 171RemoteGDB::acc(Addr va, size_t len) 172{ 173 Addr last_va; 174 175 va = TheISA::TruncPage(va); 176 last_va = TheISA::RoundPage(va + len); 177 178 do { 179 if (TheISA::IsK0Seg(va)) { 180 if (va < (TheISA::K0SegBase + pmem->size())) { 181 DPRINTF(GDBAcc, "acc: Mapping is valid K0SEG <= " 182 "%#x < K0SEG + size\n", va); 183 return true; 184 } else { 185 DPRINTF(GDBAcc, "acc: Mapping invalid %#x > K0SEG + size\n", 186 va); 187 return false; 188 } 189 } 190 191 /** 192 * This code says that all accesses to palcode (instruction and data) 193 * are valid since there isn't a va->pa mapping because palcode is 194 * accessed physically. At some point this should probably be cleaned up 195 * but there is no easy way to do it. 196 */ 197 198 if (AlphaISA::PcPAL(va) || va < 0x10000) 199 return true; 200 201 Addr ptbr = context->readMiscReg(AlphaISA::IPR_PALtemp20); 202 TheISA::PageTableEntry pte = TheISA::kernel_pte_lookup(context->getPhysPort(), ptbr, va); 203 if (!pte.valid()) { 204 DPRINTF(GDBAcc, "acc: %#x pte is invalid\n", va); 205 return false; 206 } 207 va += TheISA::PageBytes; 208 } while (va < last_va); 209 210 DPRINTF(GDBAcc, "acc: %#x mapping is valid\n", va); 211 return true; 212} 213 214/////////////////////////////////////////////////////////// 215// RemoteGDB::signal 216// 217// Translate a trap number into a Unix-compatible signal number. 218// (GDB only understands Unix signal numbers.) 219// 220int 221RemoteGDB::signal(int type) 222{ 223 switch (type) { 224 case ALPHA_KENTRY_INT: 225 return (SIGTRAP); 226 227 case ALPHA_KENTRY_UNA: 228 return (SIGBUS); 229 230 case ALPHA_KENTRY_ARITH: 231 return (SIGFPE); 232 233 case ALPHA_KENTRY_IF: 234 return (SIGILL); 235 236 case ALPHA_KENTRY_MM: 237 return (SIGSEGV); 238 239 default: 240 panic("unknown signal type"); 241 return 0; 242 } 243} 244 245/////////////////////////////////////////////////////////// 246// RemoteGDB::getregs 247// 248// Translate the kernel debugger register format into 249// the GDB register format. 250void 251RemoteGDB::getregs() 252{ 253 memset(gdbregs.regs, 0, gdbregs.size); 254 255 gdbregs.regs[KGDB_REG_PC] = context->readPC(); 256 257 // @todo: Currently this is very Alpha specific. 258 if (AlphaISA::PcPAL(gdbregs.regs[KGDB_REG_PC])) { 259 for (int i = 0; i < TheISA::NumIntArchRegs; ++i) { 260 gdbregs.regs[i] = context->readIntReg(AlphaISA::reg_redir[i]); 261 } 262 } else { 263 for (int i = 0; i < TheISA::NumIntArchRegs; ++i) { 264 gdbregs.regs[i] = context->readIntReg(i); 265 } 266 } 267 268#ifdef KGDB_FP_REGS 269 for (int i = 0; i < TheISA::NumFloatArchRegs; ++i) { 270 gdbregs.regs[i + KGDB_REG_F0] = context->readFloatRegBits(i); 271 } 272#endif 273} 274 275/////////////////////////////////////////////////////////// 276// RemoteGDB::setregs 277// 278// Translate the GDB register format into the kernel 279// debugger register format. 280// 281void 282RemoteGDB::setregs() 283{ 284 // @todo: Currently this is very Alpha specific. 285 if (AlphaISA::PcPAL(gdbregs.regs[KGDB_REG_PC])) { 286 for (int i = 0; i < TheISA::NumIntArchRegs; ++i) { 287 context->setIntReg(AlphaISA::reg_redir[i], gdbregs.regs[i]); 288 } 289 } else { 290 for (int i = 0; i < TheISA::NumIntArchRegs; ++i) { 291 context->setIntReg(i, gdbregs.regs[i]); 292 } 293 } 294 295#ifdef KGDB_FP_REGS 296 for (int i = 0; i < TheISA::NumFloatArchRegs; ++i) { 297 context->setFloatRegBits(i, gdbregs.regs[i + KGDB_REG_F0]); 298 } 299#endif 300 context->setPC(gdbregs.regs[KGDB_REG_PC]); 301} 302 303void 304RemoteGDB::setTempBreakpoint(TempBreakpoint &bkpt, Addr addr) 305{ 306 DPRINTF(GDBMisc, "setTempBreakpoint: addr=%#x\n", addr); 307 308 bkpt.address = addr; 309 insertHardBreak(addr, 4); 310} 311 312void 313RemoteGDB::clearTempBreakpoint(TempBreakpoint &bkpt) 314{ 315 DPRINTF(GDBMisc, "setTempBreakpoint: addr=%#x\n", 316 bkpt.address); 317 318 319 removeHardBreak(bkpt.address, 4); 320 bkpt.address = 0; 321} 322 323void 324RemoteGDB::clearSingleStep() 325{ 326 DPRINTF(GDBMisc, "clearSingleStep bt_addr=%#x nt_addr=%#x\n", 327 takenBkpt.address, notTakenBkpt.address); 328 329 if (takenBkpt.address != 0) 330 clearTempBreakpoint(takenBkpt); 331 332 if (notTakenBkpt.address != 0) 333 clearTempBreakpoint(notTakenBkpt); 334} 335 336void 337RemoteGDB::setSingleStep() 338{ 339 Addr pc = context->readPC(); 340 Addr npc, bpc; 341 bool set_bt = false; 342 343 npc = pc + sizeof(MachInst); 344 345 // User was stopped at pc, e.g. the instruction at pc was not 346 // executed. 347 MachInst inst = read<MachInst>(pc); 348 StaticInstPtr si(inst); 349 if (si->hasBranchTarget(pc, context, bpc)) { 350 // Don't bother setting a breakpoint on the taken branch if it 351 // is the same as the next pc 352 if (bpc != npc) 353 set_bt = true; 354 } 355 356 DPRINTF(GDBMisc, "setSingleStep bt_addr=%#x nt_addr=%#x\n", 357 takenBkpt.address, notTakenBkpt.address); 358 359 setTempBreakpoint(notTakenBkpt, npc); 360 361 if (set_bt) 362 setTempBreakpoint(takenBkpt, bpc); 363} 364 365// Write bytes to kernel address space for debugger. 366bool 367RemoteGDB::write(Addr vaddr, size_t size, const char *data) 368{ 369 if (BaseRemoteGDB::write(vaddr, size, data)) { 370#ifdef IMB 371 alpha_pal_imb(); 372#endif 373 return true; 374 } else { 375 return false; 376 } 377} 378 379 380PCEventQueue *RemoteGDB::getPcEventQueue() 381{ 382 return &system->pcEventQueue; 383} 384 385 386RemoteGDB::HardBreakpoint::HardBreakpoint(RemoteGDB *_gdb, Addr pc) 387 : PCEvent(_gdb->getPcEventQueue(), "HardBreakpoint Event", pc), 388 gdb(_gdb), refcount(0) 389{ 390 DPRINTF(GDBMisc, "creating hardware breakpoint at %#x\n", evpc); 391} 392 393void 394RemoteGDB::HardBreakpoint::process(ThreadContext *tc) 395{ 396 DPRINTF(GDBMisc, "handling hardware breakpoint at %#x\n", pc()); 397 398 if (tc == gdb->context) 399 gdb->trap(ALPHA_KENTRY_INT); 400} 401 402bool 403RemoteGDB::insertSoftBreak(Addr addr, size_t len) 404{ 405 if (len != sizeof(MachInst)) 406 panic("invalid length\n"); 407 408 return insertHardBreak(addr, len); 409} 410 411bool 412RemoteGDB::removeSoftBreak(Addr addr, size_t len) 413{ 414 if (len != sizeof(MachInst)) 415 panic("invalid length\n"); 416 417 return removeHardBreak(addr, len); 418} 419 420bool 421RemoteGDB::insertHardBreak(Addr addr, size_t len) 422{ 423 if (len != sizeof(MachInst)) 424 panic("invalid length\n"); 425 426 DPRINTF(GDBMisc, "inserting hardware breakpoint at %#x\n", addr); 427 428 HardBreakpoint *&bkpt = hardBreakMap[addr]; 429 if (bkpt == 0) 430 bkpt = new HardBreakpoint(this, addr); 431 432 bkpt->refcount++; 433 434 return true; 435} 436 437bool 438RemoteGDB::removeHardBreak(Addr addr, size_t len) 439{ 440 if (len != sizeof(MachInst)) 441 panic("invalid length\n"); 442 443 DPRINTF(GDBMisc, "removing hardware breakpoint at %#x\n", addr); 444 445 break_iter_t i = hardBreakMap.find(addr); 446 if (i == hardBreakMap.end()) 447 return false; 448 449 HardBreakpoint *hbp = (*i).second; 450 if (--hbp->refcount == 0) { 451 delete hbp; 452 hardBreakMap.erase(i); 453 } 454 455 return true; 456} 457