remote_gdb.cc revision 9202:5c8e92f3d6f7
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 <signal.h> 120#include <sys/signal.h> 121#include <unistd.h> 122 123#include <cstdio> 124#include <string> 125 126#include "arch/vtophys.hh" 127#include "base/intmath.hh" 128#include "base/remote_gdb.hh" 129#include "base/socket.hh" 130#include "base/trace.hh" 131#include "config/the_isa.hh" 132#include "cpu/static_inst.hh" 133#include "cpu/thread_context.hh" 134#include "debug/GDBAll.hh" 135#include "mem/port.hh" 136#include "mem/fs_translating_port_proxy.hh" 137#include "mem/se_translating_port_proxy.hh" 138#include "sim/full_system.hh" 139#include "sim/system.hh" 140 141using namespace std; 142using namespace Debug; 143using namespace TheISA; 144 145#ifndef NDEBUG 146vector<BaseRemoteGDB *> debuggers; 147 148void 149debugger() 150{ 151 static int current_debugger = -1; 152 if (current_debugger >= 0 && current_debugger < (int)debuggers.size()) { 153 BaseRemoteGDB *gdb = debuggers[current_debugger]; 154 if (!gdb->isattached()) 155 gdb->listener->accept(); 156 if (gdb->isattached()) 157 gdb->trap(SIGILL); 158 } 159} 160#endif 161 162/////////////////////////////////////////////////////////// 163// 164// 165// 166 167GDBListener::Event::Event(GDBListener *l, int fd, int e) 168 : PollEvent(fd, e), listener(l) 169{} 170 171void 172GDBListener::Event::process(int revent) 173{ 174 listener->accept(); 175} 176 177GDBListener::GDBListener(BaseRemoteGDB *g, int p) 178 : event(NULL), gdb(g), port(p) 179{ 180 assert(!gdb->listener); 181 gdb->listener = this; 182} 183 184GDBListener::~GDBListener() 185{ 186 if (event) 187 delete event; 188} 189 190string 191GDBListener::name() 192{ 193 return gdb->name() + ".listener"; 194} 195 196void 197GDBListener::listen() 198{ 199 if (ListenSocket::allDisabled()) { 200 warn_once("Sockets disabled, not accepting gdb connections"); 201 return; 202 } 203 204 while (!listener.listen(port, true)) { 205 DPRINTF(GDBMisc, "Can't bind port %d\n", port); 206 port++; 207 } 208 209 event = new Event(this, listener.getfd(), POLLIN); 210 pollQueue.schedule(event); 211 212#ifndef NDEBUG 213 gdb->number = debuggers.size(); 214 debuggers.push_back(gdb); 215#endif 216 217#ifndef NDEBUG 218 ccprintf(cerr, "%d: %s: listening for remote gdb #%d on port %d\n", 219 curTick(), name(), gdb->number, port); 220#else 221 ccprintf(cerr, "%d: %s: listening for remote gdb on port %d\n", 222 curTick(), name(), port); 223#endif 224} 225 226void 227GDBListener::accept() 228{ 229 if (!listener.islistening()) 230 panic("GDBListener::accept(): cannot accept if we're not listening!"); 231 232 int sfd = listener.accept(true); 233 234 if (sfd != -1) { 235 if (gdb->isattached()) 236 close(sfd); 237 else 238 gdb->attach(sfd); 239 } 240} 241 242BaseRemoteGDB::Event::Event(BaseRemoteGDB *g, int fd, int e) 243 : PollEvent(fd, e), gdb(g) 244{} 245 246void 247BaseRemoteGDB::Event::process(int revent) 248{ 249 if (revent & POLLIN) 250 gdb->trap(SIGILL); 251 else if (revent & POLLNVAL) 252 gdb->detach(); 253} 254 255BaseRemoteGDB::BaseRemoteGDB(System *_system, ThreadContext *c, size_t cacheSize) 256 : event(NULL), listener(NULL), number(-1), fd(-1), 257 active(false), attached(false), 258 system(_system), context(c), 259 gdbregs(cacheSize) 260{ 261 memset(gdbregs.regs, 0, gdbregs.bytes()); 262} 263 264BaseRemoteGDB::~BaseRemoteGDB() 265{ 266 if (event) 267 delete event; 268} 269 270string 271BaseRemoteGDB::name() 272{ 273 return system->name() + ".remote_gdb"; 274} 275 276bool 277BaseRemoteGDB::isattached() 278{ return attached; } 279 280void 281BaseRemoteGDB::attach(int f) 282{ 283 fd = f; 284 285 event = new Event(this, fd, POLLIN); 286 pollQueue.schedule(event); 287 288 attached = true; 289 DPRINTFN("remote gdb attached\n"); 290} 291 292void 293BaseRemoteGDB::detach() 294{ 295 attached = false; 296 close(fd); 297 fd = -1; 298 299 pollQueue.remove(event); 300 DPRINTFN("remote gdb detached\n"); 301} 302 303const char * 304BaseRemoteGDB::gdb_command(char cmd) 305{ 306 switch (cmd) { 307 case GDBSignal: return "KGDB_SIGNAL"; 308 case GDBSetBaud: return "KGDB_SET_BAUD"; 309 case GDBSetBreak: return "KGDB_SET_BREAK"; 310 case GDBCont: return "KGDB_CONT"; 311 case GDBAsyncCont: return "KGDB_ASYNC_CONT"; 312 case GDBDebug: return "KGDB_DEBUG"; 313 case GDBDetach: return "KGDB_DETACH"; 314 case GDBRegR: return "KGDB_REG_R"; 315 case GDBRegW: return "KGDB_REG_W"; 316 case GDBSetThread: return "KGDB_SET_THREAD"; 317 case GDBCycleStep: return "KGDB_CYCLE_STEP"; 318 case GDBSigCycleStep: return "KGDB_SIG_CYCLE_STEP"; 319 case GDBKill: return "KGDB_KILL"; 320 case GDBMemW: return "KGDB_MEM_W"; 321 case GDBMemR: return "KGDB_MEM_R"; 322 case GDBSetReg: return "KGDB_SET_REG"; 323 case GDBReadReg: return "KGDB_READ_REG"; 324 case GDBQueryVar: return "KGDB_QUERY_VAR"; 325 case GDBSetVar: return "KGDB_SET_VAR"; 326 case GDBReset: return "KGDB_RESET"; 327 case GDBStep: return "KGDB_STEP"; 328 case GDBAsyncStep: return "KGDB_ASYNC_STEP"; 329 case GDBThreadAlive: return "KGDB_THREAD_ALIVE"; 330 case GDBTargetExit: return "KGDB_TARGET_EXIT"; 331 case GDBBinaryDload: return "KGDB_BINARY_DLOAD"; 332 case GDBClrHwBkpt: return "KGDB_CLR_HW_BKPT"; 333 case GDBSetHwBkpt: return "KGDB_SET_HW_BKPT"; 334 case GDBStart: return "KGDB_START"; 335 case GDBEnd: return "KGDB_END"; 336 case GDBGoodP: return "KGDB_GOODP"; 337 case GDBBadP: return "KGDB_BADP"; 338 default: return "KGDB_UNKNOWN"; 339 } 340} 341 342///////////////////////// 343// 344// 345 346uint8_t 347BaseRemoteGDB::getbyte() 348{ 349 uint8_t b; 350 if (::read(fd, &b, 1) != 1) 351 warn("could not read byte from debugger"); 352 return b; 353} 354 355void 356BaseRemoteGDB::putbyte(uint8_t b) 357{ 358 if (::write(fd, &b, 1) != 1) 359 warn("could not write byte to debugger"); 360} 361 362// Send a packet to gdb 363void 364BaseRemoteGDB::send(const char *bp) 365{ 366 const char *p; 367 uint8_t csum, c; 368 369 DPRINTF(GDBSend, "send: %s\n", bp); 370 371 do { 372 p = bp; 373 //Start sending a packet 374 putbyte(GDBStart); 375 //Send the contents, and also keep a check sum. 376 for (csum = 0; (c = *p); p++) { 377 putbyte(c); 378 csum += c; 379 } 380 //Send the ending character. 381 putbyte(GDBEnd); 382 //Sent the checksum. 383 putbyte(i2digit(csum >> 4)); 384 putbyte(i2digit(csum)); 385 //Try transmitting over and over again until the other end doesn't send an 386 //error back. 387 } while ((c = getbyte() & 0x7f) == GDBBadP); 388} 389 390// Receive a packet from gdb 391int 392BaseRemoteGDB::recv(char *bp, int maxlen) 393{ 394 char *p; 395 int c, csum; 396 int len; 397 398 do { 399 p = bp; 400 csum = len = 0; 401 //Find the beginning of a packet 402 while ((c = getbyte()) != GDBStart) 403 ; 404 405 //Read until you find the end of the data in the packet, and keep 406 //track of the check sum. 407 while ((c = getbyte()) != GDBEnd && len < maxlen) { 408 c &= 0x7f; 409 csum += c; 410 *p++ = c; 411 len++; 412 } 413 414 //Mask the check sum, and terminate the command string. 415 csum &= 0xff; 416 *p = '\0'; 417 418 //If the command was too long, report an error. 419 if (len >= maxlen) { 420 putbyte(GDBBadP); 421 continue; 422 } 423 424 //Bring in the checksum. If the check sum matches, csum will be 0. 425 csum -= digit2i(getbyte()) * 16; 426 csum -= digit2i(getbyte()); 427 428 //If the check sum was correct 429 if (csum == 0) { 430 //Report that the packet was received correctly 431 putbyte(GDBGoodP); 432 // Sequence present? 433 if (bp[2] == ':') { 434 putbyte(bp[0]); 435 putbyte(bp[1]); 436 len -= 3; 437 memcpy(bp, bp+3, len); 438 } 439 break; 440 } 441 //Otherwise, report that there was a mistake. 442 putbyte(GDBBadP); 443 } while (1); 444 445 DPRINTF(GDBRecv, "recv: %s: %s\n", gdb_command(*bp), bp); 446 447 return (len); 448} 449 450// Read bytes from kernel address space for debugger. 451bool 452BaseRemoteGDB::read(Addr vaddr, size_t size, char *data) 453{ 454 static Addr lastaddr = 0; 455 static size_t lastsize = 0; 456 457 if (vaddr < 10) { 458 DPRINTF(GDBRead, "read: reading memory location zero!\n"); 459 vaddr = lastaddr + lastsize; 460 } 461 462 DPRINTF(GDBRead, "read: addr=%#x, size=%d", vaddr, size); 463 464 if (FullSystem) { 465 FSTranslatingPortProxy &proxy = context->getVirtProxy(); 466 proxy.readBlob(vaddr, (uint8_t*)data, size); 467 } else { 468 SETranslatingPortProxy &proxy = context->getMemProxy(); 469 proxy.readBlob(vaddr, (uint8_t*)data, size); 470 } 471 472#if TRACING_ON 473 if (DTRACE(GDBRead)) { 474 if (DTRACE(GDBExtra)) { 475 char buf[1024]; 476 mem2hex(buf, data, size); 477 DPRINTFNR(": %s\n", buf); 478 } else 479 DPRINTFNR("\n"); 480 } 481#endif 482 483 return true; 484} 485 486// Write bytes to kernel address space for debugger. 487bool 488BaseRemoteGDB::write(Addr vaddr, size_t size, const char *data) 489{ 490 static Addr lastaddr = 0; 491 static size_t lastsize = 0; 492 493 if (vaddr < 10) { 494 DPRINTF(GDBWrite, "write: writing memory location zero!\n"); 495 vaddr = lastaddr + lastsize; 496 } 497 498 if (DTRACE(GDBWrite)) { 499 DPRINTFN("write: addr=%#x, size=%d", vaddr, size); 500 if (DTRACE(GDBExtra)) { 501 char buf[1024]; 502 mem2hex(buf, data, size); 503 DPRINTFNR(": %s\n", buf); 504 } else 505 DPRINTFNR("\n"); 506 } 507 if (FullSystem) { 508 FSTranslatingPortProxy &proxy = context->getVirtProxy(); 509 proxy.writeBlob(vaddr, (uint8_t*)data, size); 510 } else { 511 SETranslatingPortProxy &proxy = context->getMemProxy(); 512 proxy.writeBlob(vaddr, (uint8_t*)data, size); 513 } 514 515 return true; 516} 517 518PCEventQueue *BaseRemoteGDB::getPcEventQueue() 519{ 520 return &system->pcEventQueue; 521} 522 523BaseRemoteGDB::HardBreakpoint::HardBreakpoint(BaseRemoteGDB *_gdb, Addr pc) 524 : PCEvent(_gdb->getPcEventQueue(), "HardBreakpoint Event", pc), 525 gdb(_gdb), refcount(0) 526{ 527 DPRINTF(GDBMisc, "creating hardware breakpoint at %#x\n", evpc); 528} 529 530void 531BaseRemoteGDB::HardBreakpoint::process(ThreadContext *tc) 532{ 533 DPRINTF(GDBMisc, "handling hardware breakpoint at %#x\n", pc()); 534 535 if (tc == gdb->context) 536 gdb->trap(SIGTRAP); 537} 538 539bool 540BaseRemoteGDB::insertSoftBreak(Addr addr, size_t len) 541{ 542 if (len != sizeof(TheISA::MachInst)) 543 panic("invalid length\n"); 544 545 return insertHardBreak(addr, len); 546} 547 548bool 549BaseRemoteGDB::removeSoftBreak(Addr addr, size_t len) 550{ 551 if (len != sizeof(MachInst)) 552 panic("invalid length\n"); 553 554 return removeHardBreak(addr, len); 555} 556 557bool 558BaseRemoteGDB::insertHardBreak(Addr addr, size_t len) 559{ 560 if (len != sizeof(MachInst)) 561 panic("invalid length\n"); 562 563 DPRINTF(GDBMisc, "inserting hardware breakpoint at %#x\n", addr); 564 565 HardBreakpoint *&bkpt = hardBreakMap[addr]; 566 if (bkpt == 0) 567 bkpt = new HardBreakpoint(this, addr); 568 569 bkpt->refcount++; 570 571 return true; 572} 573 574bool 575BaseRemoteGDB::removeHardBreak(Addr addr, size_t len) 576{ 577 if (len != sizeof(MachInst)) 578 panic("invalid length\n"); 579 580 DPRINTF(GDBMisc, "removing hardware breakpoint at %#x\n", addr); 581 582 break_iter_t i = hardBreakMap.find(addr); 583 if (i == hardBreakMap.end()) 584 return false; 585 586 HardBreakpoint *hbp = (*i).second; 587 if (--hbp->refcount == 0) { 588 delete hbp; 589 hardBreakMap.erase(i); 590 } 591 592 return true; 593} 594 595void 596BaseRemoteGDB::setTempBreakpoint(Addr bkpt) 597{ 598 DPRINTF(GDBMisc, "setTempBreakpoint: addr=%#x\n", bkpt); 599 insertHardBreak(bkpt, sizeof(TheISA::MachInst)); 600} 601 602void 603BaseRemoteGDB::clearTempBreakpoint(Addr &bkpt) 604{ 605 DPRINTF(GDBMisc, "setTempBreakpoint: addr=%#x\n", bkpt); 606 removeHardBreak(bkpt, sizeof(TheISA::MachInst)); 607 bkpt = 0; 608} 609 610const char * 611BaseRemoteGDB::break_type(char c) 612{ 613 switch(c) { 614 case '0': return "software breakpoint"; 615 case '1': return "hardware breakpoint"; 616 case '2': return "write watchpoint"; 617 case '3': return "read watchpoint"; 618 case '4': return "access watchpoint"; 619 default: return "unknown breakpoint/watchpoint"; 620 } 621} 622 623// This function does all command processing for interfacing to a 624// remote gdb. Note that the error codes are ignored by gdb at 625// present, but might eventually become meaningful. (XXX) It might 626// makes sense to use POSIX errno values, because that is what the 627// gdb/remote.c functions want to return. 628bool 629BaseRemoteGDB::trap(int type) 630{ 631 uint64_t val; 632 size_t datalen, len; 633 char data[GDBPacketBufLen + 1]; 634 char *buffer; 635 size_t bufferSize; 636 const char *p; 637 char command, subcmd; 638 string var; 639 bool ret; 640 641 if (!attached) 642 return false; 643 644 bufferSize = gdbregs.bytes() * 2 + 256; 645 buffer = (char*)malloc(bufferSize); 646 647 DPRINTF(GDBMisc, "trap: PC=%s\n", context->pcState()); 648 649 clearSingleStep(); 650 651 /* 652 * The first entry to this function is normally through 653 * a breakpoint trap in kgdb_connect(), in which case we 654 * must advance past the breakpoint because gdb will not. 655 * 656 * On the first entry here, we expect that gdb is not yet 657 * listening to us, so just enter the interaction loop. 658 * After the debugger is "active" (connected) it will be 659 * waiting for a "signaled" message from us. 660 */ 661 if (!active) 662 active = true; 663 else 664 // Tell remote host that an exception has occurred. 665 snprintf((char *)buffer, bufferSize, "S%02x", type); 666 send(buffer); 667 668 // Stick frame regs into our reg cache. 669 getregs(); 670 671 for (;;) { 672 datalen = recv(data, sizeof(data)); 673 data[sizeof(data) - 1] = 0; // Sentinel 674 command = data[0]; 675 subcmd = 0; 676 p = data + 1; 677 switch (command) { 678 679 case GDBSignal: 680 // if this command came from a running gdb, answer it -- 681 // the other guy has no way of knowing if we're in or out 682 // of this loop when he issues a "remote-signal". 683 snprintf((char *)buffer, bufferSize, 684 "S%02x", type); 685 send(buffer); 686 continue; 687 688 case GDBRegR: 689 if (2 * gdbregs.bytes() > bufferSize) 690 panic("buffer too small"); 691 692 mem2hex(buffer, gdbregs.regs, gdbregs.bytes()); 693 send(buffer); 694 continue; 695 696 case GDBRegW: 697 p = hex2mem(gdbregs.regs, p, gdbregs.bytes()); 698 if (p == NULL || *p != '\0') 699 send("E01"); 700 else { 701 setregs(); 702 send("OK"); 703 } 704 continue; 705 706#if 0 707 case GDBSetReg: 708 val = hex2i(&p); 709 if (*p++ != '=') { 710 send("E01"); 711 continue; 712 } 713 if (val < 0 && val >= KGDB_NUMREGS) { 714 send("E01"); 715 continue; 716 } 717 718 gdbregs.regs[val] = hex2i(&p); 719 setregs(); 720 send("OK"); 721 722 continue; 723#endif 724 725 case GDBMemR: 726 val = hex2i(&p); 727 if (*p++ != ',') { 728 send("E02"); 729 continue; 730 } 731 len = hex2i(&p); 732 if (*p != '\0') { 733 send("E03"); 734 continue; 735 } 736 if (len > bufferSize) { 737 send("E04"); 738 continue; 739 } 740 if (!acc(val, len)) { 741 send("E05"); 742 continue; 743 } 744 745 if (read(val, (size_t)len, (char *)buffer)) { 746 // variable length array would be nice, but C++ doesn't 747 // officially support those... 748 char *temp = new char[2*len+1]; 749 mem2hex(temp, buffer, len); 750 send(temp); 751 delete [] temp; 752 } else { 753 send("E05"); 754 } 755 continue; 756 757 case GDBMemW: 758 val = hex2i(&p); 759 if (*p++ != ',') { 760 send("E06"); 761 continue; 762 } 763 len = hex2i(&p); 764 if (*p++ != ':') { 765 send("E07"); 766 continue; 767 } 768 if (len > datalen - (p - data)) { 769 send("E08"); 770 continue; 771 } 772 p = hex2mem(buffer, p, bufferSize); 773 if (p == NULL) { 774 send("E09"); 775 continue; 776 } 777 if (!acc(val, len)) { 778 send("E0A"); 779 continue; 780 } 781 if (write(val, (size_t)len, (char *)buffer)) 782 send("OK"); 783 else 784 send("E0B"); 785 continue; 786 787 case GDBSetThread: 788 subcmd = *p++; 789 val = hex2i(&p); 790 if (val == 0) 791 send("OK"); 792 else 793 send("E01"); 794 continue; 795 796 case GDBDetach: 797 case GDBKill: 798 active = false; 799 clearSingleStep(); 800 detach(); 801 goto out; 802 803 case GDBAsyncCont: 804 subcmd = hex2i(&p); 805 if (*p++ == ';') { 806 val = hex2i(&p); 807 context->pcState(val); 808 } 809 clearSingleStep(); 810 goto out; 811 812 case GDBCont: 813 if (p - data < (ptrdiff_t)datalen) { 814 val = hex2i(&p); 815 context->pcState(val); 816 } 817 clearSingleStep(); 818 goto out; 819 820 case GDBAsyncStep: 821 subcmd = hex2i(&p); 822 if (*p++ == ';') { 823 val = hex2i(&p); 824 context->pcState(val); 825 } 826 setSingleStep(); 827 goto out; 828 829 case GDBStep: 830 if (p - data < (ptrdiff_t)datalen) { 831 val = hex2i(&p); 832 context->pcState(val); 833 } 834 setSingleStep(); 835 goto out; 836 837 case GDBClrHwBkpt: 838 subcmd = *p++; 839 if (*p++ != ',') send("E0D"); 840 val = hex2i(&p); 841 if (*p++ != ',') send("E0D"); 842 len = hex2i(&p); 843 844 DPRINTF(GDBMisc, "clear %s, addr=%#x, len=%d\n", 845 break_type(subcmd), val, len); 846 847 ret = false; 848 849 switch (subcmd) { 850 case '0': // software breakpoint 851 ret = removeSoftBreak(val, len); 852 break; 853 854 case '1': // hardware breakpoint 855 ret = removeHardBreak(val, len); 856 break; 857 858 case '2': // write watchpoint 859 case '3': // read watchpoint 860 case '4': // access watchpoint 861 default: // unknown 862 send(""); 863 break; 864 } 865 866 send(ret ? "OK" : "E0C"); 867 continue; 868 869 case GDBSetHwBkpt: 870 subcmd = *p++; 871 if (*p++ != ',') send("E0D"); 872 val = hex2i(&p); 873 if (*p++ != ',') send("E0D"); 874 len = hex2i(&p); 875 876 DPRINTF(GDBMisc, "set %s, addr=%#x, len=%d\n", 877 break_type(subcmd), val, len); 878 879 ret = false; 880 881 switch (subcmd) { 882 case '0': // software breakpoint 883 ret = insertSoftBreak(val, len); 884 break; 885 886 case '1': // hardware breakpoint 887 ret = insertHardBreak(val, len); 888 break; 889 890 case '2': // write watchpoint 891 case '3': // read watchpoint 892 case '4': // access watchpoint 893 default: // unknown 894 send(""); 895 break; 896 } 897 898 send(ret ? "OK" : "E0C"); 899 continue; 900 901 case GDBQueryVar: 902 var = string(p, datalen - 1); 903 if (var == "C") 904 send("QC0"); 905 else 906 send(""); 907 continue; 908 909 case GDBSetBaud: 910 case GDBSetBreak: 911 case GDBDebug: 912 case GDBCycleStep: 913 case GDBSigCycleStep: 914 case GDBReadReg: 915 case GDBSetVar: 916 case GDBReset: 917 case GDBThreadAlive: 918 case GDBTargetExit: 919 case GDBBinaryDload: 920 // Unsupported command 921 DPRINTF(GDBMisc, "Unsupported command: %s\n", 922 gdb_command(command)); 923 DDUMP(GDBMisc, (uint8_t *)data, datalen); 924 send(""); 925 continue; 926 927 default: 928 // Unknown command. 929 DPRINTF(GDBMisc, "Unknown command: %c(%#x)\n", 930 command, command); 931 send(""); 932 continue; 933 934 935 } 936 } 937 938 out: 939 free(buffer); 940 return true; 941} 942 943// Convert a hex digit into an integer. 944// This returns -1 if the argument passed is no valid hex digit. 945int 946BaseRemoteGDB::digit2i(char c) 947{ 948 if (c >= '0' && c <= '9') 949 return (c - '0'); 950 else if (c >= 'a' && c <= 'f') 951 return (c - 'a' + 10); 952 else if (c >= 'A' && c <= 'F') 953 954 return (c - 'A' + 10); 955 else 956 return (-1); 957} 958 959// Convert the low 4 bits of an integer into an hex digit. 960char 961BaseRemoteGDB::i2digit(int n) 962{ 963 return ("0123456789abcdef"[n & 0x0f]); 964} 965 966// Convert a byte array into an hex string. 967void 968BaseRemoteGDB::mem2hex(void *vdst, const void *vsrc, int len) 969{ 970 char *dst = (char *)vdst; 971 const char *src = (const char *)vsrc; 972 973 while (len--) { 974 *dst++ = i2digit(*src >> 4); 975 *dst++ = i2digit(*src++); 976 } 977 *dst = '\0'; 978} 979 980// Convert an hex string into a byte array. 981// This returns a pointer to the character following the last valid 982// hex digit. If the string ends in the middle of a byte, NULL is 983// returned. 984const char * 985BaseRemoteGDB::hex2mem(void *vdst, const char *src, int maxlen) 986{ 987 char *dst = (char *)vdst; 988 int msb, lsb; 989 990 while (*src && maxlen--) { 991 msb = digit2i(*src++); 992 if (msb < 0) 993 return (src - 1); 994 lsb = digit2i(*src++); 995 if (lsb < 0) 996 return (NULL); 997 *dst++ = (msb << 4) | lsb; 998 } 999 return (src); 1000} 1001 1002// Convert an hex string into an integer. 1003// This returns a pointer to the character following the last valid 1004// hex digit. 1005Addr 1006BaseRemoteGDB::hex2i(const char **srcp) 1007{ 1008 const char *src = *srcp; 1009 Addr r = 0; 1010 int nibble; 1011 1012 while ((nibble = digit2i(*src)) >= 0) { 1013 r *= 16; 1014 r += nibble; 1015 src++; 1016 } 1017 *srcp = src; 1018 return (r); 1019} 1020 1021