remote_gdb.cc revision 10598:3d7653a2538b
13914Ssaidi@eecs.umich.edu/* 23914Ssaidi@eecs.umich.edu * Copyright 2014 Google, Inc. 33914Ssaidi@eecs.umich.edu * Copyright (c) 2002-2005 The Regents of The University of Michigan 43914Ssaidi@eecs.umich.edu * All rights reserved. 53914Ssaidi@eecs.umich.edu * 63914Ssaidi@eecs.umich.edu * Redistribution and use in source and binary forms, with or without 73914Ssaidi@eecs.umich.edu * modification, are permitted provided that the following conditions are 83914Ssaidi@eecs.umich.edu * met: redistributions of source code must retain the above copyright 93914Ssaidi@eecs.umich.edu * notice, this list of conditions and the following disclaimer; 103914Ssaidi@eecs.umich.edu * redistributions in binary form must reproduce the above copyright 113914Ssaidi@eecs.umich.edu * notice, this list of conditions and the following disclaimer in the 123914Ssaidi@eecs.umich.edu * documentation and/or other materials provided with the distribution; 133914Ssaidi@eecs.umich.edu * neither the name of the copyright holders nor the names of its 143914Ssaidi@eecs.umich.edu * contributors may be used to endorse or promote products derived from 153914Ssaidi@eecs.umich.edu * this software without specific prior written permission. 163914Ssaidi@eecs.umich.edu * 173914Ssaidi@eecs.umich.edu * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 183914Ssaidi@eecs.umich.edu * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 193914Ssaidi@eecs.umich.edu * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 203914Ssaidi@eecs.umich.edu * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 213914Ssaidi@eecs.umich.edu * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 223914Ssaidi@eecs.umich.edu * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 233914Ssaidi@eecs.umich.edu * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 243914Ssaidi@eecs.umich.edu * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 253914Ssaidi@eecs.umich.edu * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 263914Ssaidi@eecs.umich.edu * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 273914Ssaidi@eecs.umich.edu * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 283914Ssaidi@eecs.umich.edu * 293914Ssaidi@eecs.umich.edu * Authors: Nathan Binkert 303914Ssaidi@eecs.umich.edu */ 313914Ssaidi@eecs.umich.edu 323914Ssaidi@eecs.umich.edu/* 333914Ssaidi@eecs.umich.edu * Copyright (c) 1990, 1993 The Regents of the University of California 3411793Sbrandon.potter@amd.com * All rights reserved 3511793Sbrandon.potter@amd.com * 363914Ssaidi@eecs.umich.edu * This software was developed by the Computer Systems Engineering group 373914Ssaidi@eecs.umich.edu * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 383914Ssaidi@eecs.umich.edu * contributed to Berkeley. 393914Ssaidi@eecs.umich.edu * 403914Ssaidi@eecs.umich.edu * All advertising materials mentioning features or use of this software 413914Ssaidi@eecs.umich.edu * must display the following acknowledgement: 424762Snate@binkert.org * This product includes software developed by the University of 433914Ssaidi@eecs.umich.edu * California, Lawrence Berkeley Laboratories. 443914Ssaidi@eecs.umich.edu * 453914Ssaidi@eecs.umich.edu * Redistribution and use in source and binary forms, with or without 463914Ssaidi@eecs.umich.edu * modification, are permitted provided that the following conditions 473914Ssaidi@eecs.umich.edu * are met: 483914Ssaidi@eecs.umich.edu * 1. Redistributions of source code must retain the above copyright 493914Ssaidi@eecs.umich.edu * notice, this list of conditions and the following disclaimer. 503914Ssaidi@eecs.umich.edu * 2. Redistributions in binary form must reproduce the above copyright 514762Snate@binkert.org * notice, this list of conditions and the following disclaimer in the 529808Sstever@gmail.com * documentation and/or other materials provided with the distribution. 533914Ssaidi@eecs.umich.edu * 3. All advertising materials mentioning features or use of this software 544762Snate@binkert.org * must display the following acknowledgement: 5510531Sandreas.hansson@arm.com * This product includes software developed by the University of 563943Sbinkertn@umich.edu * California, Berkeley and its contributors. 573914Ssaidi@eecs.umich.edu * 4. Neither the name of the University nor the names of its contributors 583914Ssaidi@eecs.umich.edu * may be used to endorse or promote products derived from this software 593914Ssaidi@eecs.umich.edu * without specific prior written permission. 603914Ssaidi@eecs.umich.edu * 613914Ssaidi@eecs.umich.edu * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 623914Ssaidi@eecs.umich.edu * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 633914Ssaidi@eecs.umich.edu * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 643914Ssaidi@eecs.umich.edu * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 653914Ssaidi@eecs.umich.edu * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 663914Ssaidi@eecs.umich.edu * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 6713231Sgabeblack@google.com * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 683914Ssaidi@eecs.umich.edu * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 693914Ssaidi@eecs.umich.edu * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 704870Sstever@eecs.umich.edu * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 713914Ssaidi@eecs.umich.edu * SUCH DAMAGE. 723914Ssaidi@eecs.umich.edu * 733914Ssaidi@eecs.umich.edu * @(#)kgdb_stub.c 8.4 (Berkeley) 1/12/94 743914Ssaidi@eecs.umich.edu */ 753914Ssaidi@eecs.umich.edu 763914Ssaidi@eecs.umich.edu/*- 773914Ssaidi@eecs.umich.edu * Copyright (c) 2001 The NetBSD Foundation, Inc. 783914Ssaidi@eecs.umich.edu * All rights reserved. 793914Ssaidi@eecs.umich.edu * 803990Ssaidi@eecs.umich.edu * This code is derived from software contributed to The NetBSD Foundation 8110905Sandreas.sandberg@arm.com * by Jason R. Thorpe. 823990Ssaidi@eecs.umich.edu * 833990Ssaidi@eecs.umich.edu * Redistribution and use in source and binary forms, with or without 843990Ssaidi@eecs.umich.edu * modification, are permitted provided that the following conditions 853990Ssaidi@eecs.umich.edu * are met: 863990Ssaidi@eecs.umich.edu * 1. Redistributions of source code must retain the above copyright 8710905Sandreas.sandberg@arm.com * notice, this list of conditions and the following disclaimer. 883990Ssaidi@eecs.umich.edu * 2. Redistributions in binary form must reproduce the above copyright 893990Ssaidi@eecs.umich.edu * notice, this list of conditions and the following disclaimer in the 903990Ssaidi@eecs.umich.edu * documentation and/or other materials provided with the distribution. 913990Ssaidi@eecs.umich.edu * 3. All advertising materials mentioning features or use of this software 924762Snate@binkert.org * must display the following acknowledgement: 934762Snate@binkert.org * This product includes software developed by the NetBSD 943914Ssaidi@eecs.umich.edu * Foundation, Inc. and its contributors. 954762Snate@binkert.org * 4. Neither the name of The NetBSD Foundation nor the names of its 963914Ssaidi@eecs.umich.edu * contributors may be used to endorse or promote products derived 97 * from this software without specific prior written permission. 98 * 99 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 100 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 101 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 102 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 103 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 104 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 105 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 106 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 107 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 108 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 109 * POSSIBILITY OF SUCH DAMAGE. 110 */ 111 112/* 113 * $NetBSD: kgdb_stub.c,v 1.8 2001/07/07 22:58:00 wdk Exp $ 114 * 115 * Taken from NetBSD 116 * 117 * "Stub" to allow remote cpu to debug over a serial line using gdb. 118 */ 119 120#include <signal.h> 121#include <sys/signal.h> 122#include <unistd.h> 123 124#include <cstdio> 125#include <string> 126 127#include "arch/vtophys.hh" 128#include "base/intmath.hh" 129#include "base/remote_gdb.hh" 130#include "base/socket.hh" 131#include "base/trace.hh" 132#include "config/the_isa.hh" 133#include "cpu/base.hh" 134#include "cpu/static_inst.hh" 135#include "cpu/thread_context.hh" 136#include "debug/GDBAll.hh" 137#include "mem/port.hh" 138#include "mem/fs_translating_port_proxy.hh" 139#include "mem/se_translating_port_proxy.hh" 140#include "sim/full_system.hh" 141#include "sim/system.hh" 142 143using namespace std; 144using namespace Debug; 145using namespace TheISA; 146 147#ifndef NDEBUG 148vector<BaseRemoteGDB *> debuggers; 149 150void 151debugger() 152{ 153 static int current_debugger = -1; 154 if (current_debugger >= 0 && current_debugger < (int)debuggers.size()) { 155 BaseRemoteGDB *gdb = debuggers[current_debugger]; 156 if (!gdb->isattached()) 157 gdb->listener->accept(); 158 if (gdb->isattached()) 159 gdb->trap(SIGILL); 160 } 161} 162#endif 163 164/////////////////////////////////////////////////////////// 165// 166// 167// 168 169GDBListener::InputEvent::InputEvent(GDBListener *l, int fd, int e) 170 : PollEvent(fd, e), listener(l) 171{} 172 173void 174GDBListener::InputEvent::process(int revent) 175{ 176 listener->accept(); 177} 178 179GDBListener::GDBListener(BaseRemoteGDB *g, int p) 180 : inputEvent(NULL), gdb(g), port(p) 181{ 182 assert(!gdb->listener); 183 gdb->listener = this; 184} 185 186GDBListener::~GDBListener() 187{ 188 if (inputEvent) 189 delete inputEvent; 190} 191 192string 193GDBListener::name() 194{ 195 return gdb->name() + ".listener"; 196} 197 198void 199GDBListener::listen() 200{ 201 if (ListenSocket::allDisabled()) { 202 warn_once("Sockets disabled, not accepting gdb connections"); 203 return; 204 } 205 206 while (!listener.listen(port, true)) { 207 DPRINTF(GDBMisc, "Can't bind port %d\n", port); 208 port++; 209 } 210 211 inputEvent = new InputEvent(this, listener.getfd(), POLLIN); 212 pollQueue.schedule(inputEvent); 213 214#ifndef NDEBUG 215 gdb->number = debuggers.size(); 216 debuggers.push_back(gdb); 217#endif 218 219#ifndef NDEBUG 220 ccprintf(cerr, "%d: %s: listening for remote gdb #%d on port %d\n", 221 curTick(), name(), gdb->number, port); 222#else 223 ccprintf(cerr, "%d: %s: listening for remote gdb on port %d\n", 224 curTick(), name(), port); 225#endif 226} 227 228void 229GDBListener::accept() 230{ 231 if (!listener.islistening()) 232 panic("GDBListener::accept(): cannot accept if we're not listening!"); 233 234 int sfd = listener.accept(true); 235 236 if (sfd != -1) { 237 if (gdb->isattached()) 238 close(sfd); 239 else 240 gdb->attach(sfd); 241 } 242} 243 244BaseRemoteGDB::InputEvent::InputEvent(BaseRemoteGDB *g, int fd, int e) 245 : PollEvent(fd, e), gdb(g) 246{} 247 248void 249BaseRemoteGDB::InputEvent::process(int revent) 250{ 251 BaseCPU *cpu = gdb->context->getCpuPtr(); 252 EventQueue *eq = cpu->comInstEventQueue[gdb->context->threadId()]; 253 if (revent & POLLIN) { 254 gdb->trapEvent.type(SIGILL); 255 // Here "ticks" aren't simulator ticks which measure time, they're 256 // instructions committed by the CPU. 257 eq->schedule(&gdb->trapEvent, eq->getCurTick()); 258 } else if (revent & POLLNVAL) { 259 if (gdb->trapEvent.scheduled()) 260 eq->deschedule(&gdb->trapEvent); 261 gdb->detach(); 262 } 263} 264 265void 266BaseRemoteGDB::TrapEvent::process() 267{ 268 gdb->trap(_type); 269} 270 271BaseRemoteGDB::BaseRemoteGDB(System *_system, ThreadContext *c, size_t cacheSize) 272 : inputEvent(NULL), trapEvent(this), listener(NULL), number(-1), fd(-1), 273 active(false), attached(false), 274 system(_system), context(c), 275 gdbregs(cacheSize) 276{ 277 memset(gdbregs.regs, 0, gdbregs.bytes()); 278} 279 280BaseRemoteGDB::~BaseRemoteGDB() 281{ 282 if (inputEvent) 283 delete inputEvent; 284} 285 286string 287BaseRemoteGDB::name() 288{ 289 return system->name() + ".remote_gdb"; 290} 291 292bool 293BaseRemoteGDB::isattached() 294{ return attached; } 295 296void 297BaseRemoteGDB::attach(int f) 298{ 299 fd = f; 300 301 inputEvent = new InputEvent(this, fd, POLLIN); 302 pollQueue.schedule(inputEvent); 303 304 attached = true; 305 DPRINTFN("remote gdb attached\n"); 306} 307 308void 309BaseRemoteGDB::detach() 310{ 311 attached = false; 312 close(fd); 313 fd = -1; 314 315 pollQueue.remove(inputEvent); 316 DPRINTFN("remote gdb detached\n"); 317} 318 319const char * 320BaseRemoteGDB::gdb_command(char cmd) 321{ 322 switch (cmd) { 323 case GDBSignal: return "KGDB_SIGNAL"; 324 case GDBSetBaud: return "KGDB_SET_BAUD"; 325 case GDBSetBreak: return "KGDB_SET_BREAK"; 326 case GDBCont: return "KGDB_CONT"; 327 case GDBAsyncCont: return "KGDB_ASYNC_CONT"; 328 case GDBDebug: return "KGDB_DEBUG"; 329 case GDBDetach: return "KGDB_DETACH"; 330 case GDBRegR: return "KGDB_REG_R"; 331 case GDBRegW: return "KGDB_REG_W"; 332 case GDBSetThread: return "KGDB_SET_THREAD"; 333 case GDBCycleStep: return "KGDB_CYCLE_STEP"; 334 case GDBSigCycleStep: return "KGDB_SIG_CYCLE_STEP"; 335 case GDBKill: return "KGDB_KILL"; 336 case GDBMemW: return "KGDB_MEM_W"; 337 case GDBMemR: return "KGDB_MEM_R"; 338 case GDBSetReg: return "KGDB_SET_REG"; 339 case GDBReadReg: return "KGDB_READ_REG"; 340 case GDBQueryVar: return "KGDB_QUERY_VAR"; 341 case GDBSetVar: return "KGDB_SET_VAR"; 342 case GDBReset: return "KGDB_RESET"; 343 case GDBStep: return "KGDB_STEP"; 344 case GDBAsyncStep: return "KGDB_ASYNC_STEP"; 345 case GDBThreadAlive: return "KGDB_THREAD_ALIVE"; 346 case GDBTargetExit: return "KGDB_TARGET_EXIT"; 347 case GDBBinaryDload: return "KGDB_BINARY_DLOAD"; 348 case GDBClrHwBkpt: return "KGDB_CLR_HW_BKPT"; 349 case GDBSetHwBkpt: return "KGDB_SET_HW_BKPT"; 350 case GDBStart: return "KGDB_START"; 351 case GDBEnd: return "KGDB_END"; 352 case GDBGoodP: return "KGDB_GOODP"; 353 case GDBBadP: return "KGDB_BADP"; 354 default: return "KGDB_UNKNOWN"; 355 } 356} 357 358///////////////////////// 359// 360// 361 362uint8_t 363BaseRemoteGDB::getbyte() 364{ 365 uint8_t b; 366 if (::read(fd, &b, 1) != 1) 367 warn("could not read byte from debugger"); 368 return b; 369} 370 371void 372BaseRemoteGDB::putbyte(uint8_t b) 373{ 374 if (::write(fd, &b, 1) != 1) 375 warn("could not write byte to debugger"); 376} 377 378// Send a packet to gdb 379void 380BaseRemoteGDB::send(const char *bp) 381{ 382 const char *p; 383 uint8_t csum, c; 384 385 DPRINTF(GDBSend, "send: %s\n", bp); 386 387 do { 388 p = bp; 389 //Start sending a packet 390 putbyte(GDBStart); 391 //Send the contents, and also keep a check sum. 392 for (csum = 0; (c = *p); p++) { 393 putbyte(c); 394 csum += c; 395 } 396 //Send the ending character. 397 putbyte(GDBEnd); 398 //Sent the checksum. 399 putbyte(i2digit(csum >> 4)); 400 putbyte(i2digit(csum)); 401 //Try transmitting over and over again until the other end doesn't send an 402 //error back. 403 } while ((c = getbyte() & 0x7f) == GDBBadP); 404} 405 406// Receive a packet from gdb 407int 408BaseRemoteGDB::recv(char *bp, int maxlen) 409{ 410 char *p; 411 int c, csum; 412 int len; 413 414 do { 415 p = bp; 416 csum = len = 0; 417 //Find the beginning of a packet 418 while ((c = getbyte()) != GDBStart) 419 ; 420 421 //Read until you find the end of the data in the packet, and keep 422 //track of the check sum. 423 while ((c = getbyte()) != GDBEnd && len < maxlen) { 424 c &= 0x7f; 425 csum += c; 426 *p++ = c; 427 len++; 428 } 429 430 //Mask the check sum, and terminate the command string. 431 csum &= 0xff; 432 *p = '\0'; 433 434 //If the command was too long, report an error. 435 if (len >= maxlen) { 436 putbyte(GDBBadP); 437 continue; 438 } 439 440 //Bring in the checksum. If the check sum matches, csum will be 0. 441 csum -= digit2i(getbyte()) * 16; 442 csum -= digit2i(getbyte()); 443 444 //If the check sum was correct 445 if (csum == 0) { 446 //Report that the packet was received correctly 447 putbyte(GDBGoodP); 448 // Sequence present? 449 if (bp[2] == ':') { 450 putbyte(bp[0]); 451 putbyte(bp[1]); 452 len -= 3; 453 memcpy(bp, bp+3, len); 454 } 455 break; 456 } 457 //Otherwise, report that there was a mistake. 458 putbyte(GDBBadP); 459 } while (1); 460 461 DPRINTF(GDBRecv, "recv: %s: %s\n", gdb_command(*bp), bp); 462 463 return (len); 464} 465 466// Read bytes from kernel address space for debugger. 467bool 468BaseRemoteGDB::read(Addr vaddr, size_t size, char *data) 469{ 470 static Addr lastaddr = 0; 471 static size_t lastsize = 0; 472 473 if (vaddr < 10) { 474 DPRINTF(GDBRead, "read: reading memory location zero!\n"); 475 vaddr = lastaddr + lastsize; 476 } 477 478 DPRINTF(GDBRead, "read: addr=%#x, size=%d", vaddr, size); 479 480 if (FullSystem) { 481 FSTranslatingPortProxy &proxy = context->getVirtProxy(); 482 proxy.readBlob(vaddr, (uint8_t*)data, size); 483 } else { 484 SETranslatingPortProxy &proxy = context->getMemProxy(); 485 proxy.readBlob(vaddr, (uint8_t*)data, size); 486 } 487 488#if TRACING_ON 489 if (DTRACE(GDBRead)) { 490 if (DTRACE(GDBExtra)) { 491 char buf[1024]; 492 mem2hex(buf, data, size); 493 DPRINTFNR(": %s\n", buf); 494 } else 495 DPRINTFNR("\n"); 496 } 497#endif 498 499 return true; 500} 501 502// Write bytes to kernel address space for debugger. 503bool 504BaseRemoteGDB::write(Addr vaddr, size_t size, const char *data) 505{ 506 static Addr lastaddr = 0; 507 static size_t lastsize = 0; 508 509 if (vaddr < 10) { 510 DPRINTF(GDBWrite, "write: writing memory location zero!\n"); 511 vaddr = lastaddr + lastsize; 512 } 513 514 if (DTRACE(GDBWrite)) { 515 DPRINTFN("write: addr=%#x, size=%d", vaddr, size); 516 if (DTRACE(GDBExtra)) { 517 char buf[1024]; 518 mem2hex(buf, data, size); 519 DPRINTFNR(": %s\n", buf); 520 } else 521 DPRINTFNR("\n"); 522 } 523 if (FullSystem) { 524 FSTranslatingPortProxy &proxy = context->getVirtProxy(); 525 proxy.writeBlob(vaddr, (uint8_t*)data, size); 526 } else { 527 SETranslatingPortProxy &proxy = context->getMemProxy(); 528 proxy.writeBlob(vaddr, (uint8_t*)data, size); 529 } 530 531 return true; 532} 533 534PCEventQueue *BaseRemoteGDB::getPcEventQueue() 535{ 536 return &system->pcEventQueue; 537} 538 539bool 540BaseRemoteGDB::checkBpLen(size_t len) 541{ 542 return len == sizeof(MachInst); 543} 544 545BaseRemoteGDB::HardBreakpoint::HardBreakpoint(BaseRemoteGDB *_gdb, Addr pc) 546 : PCEvent(_gdb->getPcEventQueue(), "HardBreakpoint Event", pc), 547 gdb(_gdb), refcount(0) 548{ 549 DPRINTF(GDBMisc, "creating hardware breakpoint at %#x\n", evpc); 550} 551 552void 553BaseRemoteGDB::HardBreakpoint::process(ThreadContext *tc) 554{ 555 DPRINTF(GDBMisc, "handling hardware breakpoint at %#x\n", pc()); 556 557 if (tc == gdb->context) 558 gdb->trap(SIGTRAP); 559} 560 561bool 562BaseRemoteGDB::insertSoftBreak(Addr addr, size_t len) 563{ 564 if (!checkBpLen(len)) 565 panic("invalid length\n"); 566 567 return insertHardBreak(addr, len); 568} 569 570bool 571BaseRemoteGDB::removeSoftBreak(Addr addr, size_t len) 572{ 573 if (!checkBpLen(len)) 574 panic("invalid length\n"); 575 576 return removeHardBreak(addr, len); 577} 578 579bool 580BaseRemoteGDB::insertHardBreak(Addr addr, size_t len) 581{ 582 if (!checkBpLen(len)) 583 panic("invalid length\n"); 584 585 DPRINTF(GDBMisc, "inserting hardware breakpoint at %#x\n", addr); 586 587 HardBreakpoint *&bkpt = hardBreakMap[addr]; 588 if (bkpt == 0) 589 bkpt = new HardBreakpoint(this, addr); 590 591 bkpt->refcount++; 592 593 return true; 594} 595 596bool 597BaseRemoteGDB::removeHardBreak(Addr addr, size_t len) 598{ 599 if (!checkBpLen(len)) 600 panic("invalid length\n"); 601 602 DPRINTF(GDBMisc, "removing hardware breakpoint at %#x\n", addr); 603 604 break_iter_t i = hardBreakMap.find(addr); 605 if (i == hardBreakMap.end()) 606 return false; 607 608 HardBreakpoint *hbp = (*i).second; 609 if (--hbp->refcount == 0) { 610 delete hbp; 611 hardBreakMap.erase(i); 612 } 613 614 return true; 615} 616 617void 618BaseRemoteGDB::setTempBreakpoint(Addr bkpt) 619{ 620 DPRINTF(GDBMisc, "setTempBreakpoint: addr=%#x\n", bkpt); 621 insertHardBreak(bkpt, sizeof(TheISA::MachInst)); 622} 623 624void 625BaseRemoteGDB::clearTempBreakpoint(Addr &bkpt) 626{ 627 DPRINTF(GDBMisc, "setTempBreakpoint: addr=%#x\n", bkpt); 628 removeHardBreak(bkpt, sizeof(TheISA::MachInst)); 629 bkpt = 0; 630} 631 632const char * 633BaseRemoteGDB::break_type(char c) 634{ 635 switch(c) { 636 case '0': return "software breakpoint"; 637 case '1': return "hardware breakpoint"; 638 case '2': return "write watchpoint"; 639 case '3': return "read watchpoint"; 640 case '4': return "access watchpoint"; 641 default: return "unknown breakpoint/watchpoint"; 642 } 643} 644 645// This function does all command processing for interfacing to a 646// remote gdb. Note that the error codes are ignored by gdb at 647// present, but might eventually become meaningful. (XXX) It might 648// makes sense to use POSIX errno values, because that is what the 649// gdb/remote.c functions want to return. 650bool 651BaseRemoteGDB::trap(int type) 652{ 653 uint64_t val; 654 size_t datalen, len; 655 char data[GDBPacketBufLen + 1]; 656 char *buffer; 657 size_t bufferSize; 658 const char *p; 659 char command, subcmd; 660 string var; 661 bool ret; 662 663 if (!attached) 664 return false; 665 666 bufferSize = gdbregs.bytes() * 2 + 256; 667 buffer = (char*)malloc(bufferSize); 668 669 DPRINTF(GDBMisc, "trap: PC=%s\n", context->pcState()); 670 671 clearSingleStep(); 672 673 /* 674 * The first entry to this function is normally through 675 * a breakpoint trap in kgdb_connect(), in which case we 676 * must advance past the breakpoint because gdb will not. 677 * 678 * On the first entry here, we expect that gdb is not yet 679 * listening to us, so just enter the interaction loop. 680 * After the debugger is "active" (connected) it will be 681 * waiting for a "signaled" message from us. 682 */ 683 if (!active) { 684 active = true; 685 } else { 686 // Tell remote host that an exception has occurred. 687 snprintf((char *)buffer, bufferSize, "S%02x", type); 688 send(buffer); 689 } 690 691 // Stick frame regs into our reg cache. 692 getregs(); 693 694 for (;;) { 695 datalen = recv(data, sizeof(data)); 696 data[sizeof(data) - 1] = 0; // Sentinel 697 command = data[0]; 698 subcmd = 0; 699 p = data + 1; 700 switch (command) { 701 702 case GDBSignal: 703 // if this command came from a running gdb, answer it -- 704 // the other guy has no way of knowing if we're in or out 705 // of this loop when he issues a "remote-signal". 706 snprintf((char *)buffer, bufferSize, 707 "S%02x", type); 708 send(buffer); 709 continue; 710 711 case GDBRegR: 712 if (2 * gdbregs.bytes() > bufferSize) 713 panic("buffer too small"); 714 715 mem2hex(buffer, gdbregs.regs, gdbregs.bytes()); 716 send(buffer); 717 continue; 718 719 case GDBRegW: 720 p = hex2mem(gdbregs.regs, p, gdbregs.bytes()); 721 if (p == NULL || *p != '\0') 722 send("E01"); 723 else { 724 setregs(); 725 send("OK"); 726 } 727 continue; 728 729#if 0 730 case GDBSetReg: 731 val = hex2i(&p); 732 if (*p++ != '=') { 733 send("E01"); 734 continue; 735 } 736 if (val < 0 && val >= KGDB_NUMREGS) { 737 send("E01"); 738 continue; 739 } 740 741 gdbregs.regs[val] = hex2i(&p); 742 setregs(); 743 send("OK"); 744 745 continue; 746#endif 747 748 case GDBMemR: 749 val = hex2i(&p); 750 if (*p++ != ',') { 751 send("E02"); 752 continue; 753 } 754 len = hex2i(&p); 755 if (*p != '\0') { 756 send("E03"); 757 continue; 758 } 759 if (len > bufferSize) { 760 send("E04"); 761 continue; 762 } 763 if (!acc(val, len)) { 764 send("E05"); 765 continue; 766 } 767 768 if (read(val, (size_t)len, (char *)buffer)) { 769 // variable length array would be nice, but C++ doesn't 770 // officially support those... 771 char *temp = new char[2*len+1]; 772 mem2hex(temp, buffer, len); 773 send(temp); 774 delete [] temp; 775 } else { 776 send("E05"); 777 } 778 continue; 779 780 case GDBMemW: 781 val = hex2i(&p); 782 if (*p++ != ',') { 783 send("E06"); 784 continue; 785 } 786 len = hex2i(&p); 787 if (*p++ != ':') { 788 send("E07"); 789 continue; 790 } 791 if (len > datalen - (p - data)) { 792 send("E08"); 793 continue; 794 } 795 p = hex2mem(buffer, p, bufferSize); 796 if (p == NULL) { 797 send("E09"); 798 continue; 799 } 800 if (!acc(val, len)) { 801 send("E0A"); 802 continue; 803 } 804 if (write(val, (size_t)len, (char *)buffer)) 805 send("OK"); 806 else 807 send("E0B"); 808 continue; 809 810 case GDBSetThread: 811 subcmd = *p++; 812 val = hex2i(&p); 813 if (val == 0) 814 send("OK"); 815 else 816 send("E01"); 817 continue; 818 819 case GDBDetach: 820 case GDBKill: 821 active = false; 822 clearSingleStep(); 823 detach(); 824 goto out; 825 826 case GDBAsyncCont: 827 subcmd = hex2i(&p); 828 if (*p++ == ';') { 829 val = hex2i(&p); 830 context->pcState(val); 831 } 832 clearSingleStep(); 833 goto out; 834 835 case GDBCont: 836 if (p - data < (ptrdiff_t)datalen) { 837 val = hex2i(&p); 838 context->pcState(val); 839 } 840 clearSingleStep(); 841 goto out; 842 843 case GDBAsyncStep: 844 subcmd = hex2i(&p); 845 if (*p++ == ';') { 846 val = hex2i(&p); 847 context->pcState(val); 848 } 849 setSingleStep(); 850 goto out; 851 852 case GDBStep: 853 if (p - data < (ptrdiff_t)datalen) { 854 val = hex2i(&p); 855 context->pcState(val); 856 } 857 setSingleStep(); 858 goto out; 859 860 case GDBClrHwBkpt: 861 subcmd = *p++; 862 if (*p++ != ',') send("E0D"); 863 val = hex2i(&p); 864 if (*p++ != ',') send("E0D"); 865 len = hex2i(&p); 866 867 DPRINTF(GDBMisc, "clear %s, addr=%#x, len=%d\n", 868 break_type(subcmd), val, len); 869 870 ret = false; 871 872 switch (subcmd) { 873 case '0': // software breakpoint 874 ret = removeSoftBreak(val, len); 875 break; 876 877 case '1': // hardware breakpoint 878 ret = removeHardBreak(val, len); 879 break; 880 881 case '2': // write watchpoint 882 case '3': // read watchpoint 883 case '4': // access watchpoint 884 default: // unknown 885 send(""); 886 break; 887 } 888 889 send(ret ? "OK" : "E0C"); 890 continue; 891 892 case GDBSetHwBkpt: 893 subcmd = *p++; 894 if (*p++ != ',') send("E0D"); 895 val = hex2i(&p); 896 if (*p++ != ',') send("E0D"); 897 len = hex2i(&p); 898 899 DPRINTF(GDBMisc, "set %s, addr=%#x, len=%d\n", 900 break_type(subcmd), val, len); 901 902 ret = false; 903 904 switch (subcmd) { 905 case '0': // software breakpoint 906 ret = insertSoftBreak(val, len); 907 break; 908 909 case '1': // hardware breakpoint 910 ret = insertHardBreak(val, len); 911 break; 912 913 case '2': // write watchpoint 914 case '3': // read watchpoint 915 case '4': // access watchpoint 916 default: // unknown 917 send(""); 918 break; 919 } 920 921 send(ret ? "OK" : "E0C"); 922 continue; 923 924 case GDBQueryVar: 925 var = string(p, datalen - 1); 926 if (var == "C") 927 send("QC0"); 928 else 929 send(""); 930 continue; 931 932 case GDBSetBaud: 933 case GDBSetBreak: 934 case GDBDebug: 935 case GDBCycleStep: 936 case GDBSigCycleStep: 937 case GDBReadReg: 938 case GDBSetVar: 939 case GDBReset: 940 case GDBThreadAlive: 941 case GDBTargetExit: 942 case GDBBinaryDload: 943 // Unsupported command 944 DPRINTF(GDBMisc, "Unsupported command: %s\n", 945 gdb_command(command)); 946 DDUMP(GDBMisc, (uint8_t *)data, datalen); 947 send(""); 948 continue; 949 950 default: 951 // Unknown command. 952 DPRINTF(GDBMisc, "Unknown command: %c(%#x)\n", 953 command, command); 954 send(""); 955 continue; 956 957 958 } 959 } 960 961 out: 962 free(buffer); 963 return true; 964} 965 966// Convert a hex digit into an integer. 967// This returns -1 if the argument passed is no valid hex digit. 968int 969BaseRemoteGDB::digit2i(char c) 970{ 971 if (c >= '0' && c <= '9') 972 return (c - '0'); 973 else if (c >= 'a' && c <= 'f') 974 return (c - 'a' + 10); 975 else if (c >= 'A' && c <= 'F') 976 977 return (c - 'A' + 10); 978 else 979 return (-1); 980} 981 982// Convert the low 4 bits of an integer into an hex digit. 983char 984BaseRemoteGDB::i2digit(int n) 985{ 986 return ("0123456789abcdef"[n & 0x0f]); 987} 988 989// Convert a byte array into an hex string. 990void 991BaseRemoteGDB::mem2hex(void *vdst, const void *vsrc, int len) 992{ 993 char *dst = (char *)vdst; 994 const char *src = (const char *)vsrc; 995 996 while (len--) { 997 *dst++ = i2digit(*src >> 4); 998 *dst++ = i2digit(*src++); 999 } 1000 *dst = '\0'; 1001} 1002 1003// Convert an hex string into a byte array. 1004// This returns a pointer to the character following the last valid 1005// hex digit. If the string ends in the middle of a byte, NULL is 1006// returned. 1007const char * 1008BaseRemoteGDB::hex2mem(void *vdst, const char *src, int maxlen) 1009{ 1010 char *dst = (char *)vdst; 1011 int msb, lsb; 1012 1013 while (*src && maxlen--) { 1014 msb = digit2i(*src++); 1015 if (msb < 0) 1016 return (src - 1); 1017 lsb = digit2i(*src++); 1018 if (lsb < 0) 1019 return (NULL); 1020 *dst++ = (msb << 4) | lsb; 1021 } 1022 return (src); 1023} 1024 1025// Convert an hex string into an integer. 1026// This returns a pointer to the character following the last valid 1027// hex digit. 1028Addr 1029BaseRemoteGDB::hex2i(const char **srcp) 1030{ 1031 const char *src = *srcp; 1032 Addr r = 0; 1033 int nibble; 1034 1035 while ((nibble = digit2i(*src)) >= 0) { 1036 r *= 16; 1037 r += nibble; 1038 src++; 1039 } 1040 *srcp = src; 1041 return (r); 1042} 1043 1044