remote_gdb.cc revision 7723:ee4ac00d0774
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 <cstdio> 122#include <string> 123#include <unistd.h> 124 125#include "config/full_system.hh" 126 127#if FULL_SYSTEM 128#include "arch/vtophys.hh" 129#include "mem/vport.hh" 130#endif 131 132#include "base/intmath.hh" 133#include "base/remote_gdb.hh" 134#include "base/socket.hh" 135#include "base/trace.hh" 136#include "config/the_isa.hh" 137#include "cpu/thread_context.hh" 138#include "cpu/static_inst.hh" 139#include "mem/port.hh" 140#include "mem/translating_port.hh" 141#include "sim/system.hh" 142 143using namespace std; 144using namespace TheISA; 145 146#ifndef NDEBUG 147vector<BaseRemoteGDB *> debuggers; 148 149void 150debugger() 151{ 152 static int current_debugger = -1; 153 if (current_debugger >= 0 && current_debugger < (int)debuggers.size()) { 154 BaseRemoteGDB *gdb = debuggers[current_debugger]; 155 if (!gdb->isattached()) 156 gdb->listener->accept(); 157 if (gdb->isattached()) 158 gdb->trap(SIGILL); 159 } 160} 161#endif 162 163/////////////////////////////////////////////////////////// 164// 165// 166// 167 168GDBListener::Event::Event(GDBListener *l, int fd, int e) 169 : PollEvent(fd, e), listener(l) 170{} 171 172void 173GDBListener::Event::process(int revent) 174{ 175 listener->accept(); 176} 177 178GDBListener::GDBListener(BaseRemoteGDB *g, int p) 179 : event(NULL), gdb(g), port(p) 180{ 181 assert(!gdb->listener); 182 gdb->listener = this; 183} 184 185GDBListener::~GDBListener() 186{ 187 if (event) 188 delete event; 189} 190 191string 192GDBListener::name() 193{ 194 return gdb->name() + ".listener"; 195} 196 197void 198GDBListener::listen() 199{ 200 if (ListenSocket::allDisabled()) { 201 warn_once("Sockets disabled, not accepting gdb connections"); 202 return; 203 } 204 205 while (!listener.listen(port, true)) { 206 DPRINTF(GDBMisc, "Can't bind port %d\n", port); 207 port++; 208 } 209 210 event = new Event(this, listener.getfd(), POLLIN); 211 pollQueue.schedule(event); 212 213#ifndef NDEBUG 214 gdb->number = debuggers.size(); 215 debuggers.push_back(gdb); 216#endif 217 218#ifndef NDEBUG 219 ccprintf(cerr, "%d: %s: listening for remote gdb #%d on port %d\n", 220 curTick, name(), gdb->number, port); 221#else 222 ccprintf(cerr, "%d: %s: listening for remote gdb on port %d\n", 223 curTick, name(), port); 224#endif 225} 226 227void 228GDBListener::accept() 229{ 230 if (!listener.islistening()) 231 panic("GDBListener::accept(): cannot accept if we're not listening!"); 232 233 int sfd = listener.accept(true); 234 235 if (sfd != -1) { 236 if (gdb->isattached()) 237 close(sfd); 238 else 239 gdb->attach(sfd); 240 } 241} 242 243BaseRemoteGDB::Event::Event(BaseRemoteGDB *g, int fd, int e) 244 : PollEvent(fd, e), gdb(g) 245{} 246 247void 248BaseRemoteGDB::Event::process(int revent) 249{ 250 if (revent & POLLIN) 251 gdb->trap(SIGILL); 252 else if (revent & POLLNVAL) 253 gdb->detach(); 254} 255 256BaseRemoteGDB::BaseRemoteGDB(System *_system, ThreadContext *c, size_t cacheSize) 257 : event(NULL), listener(NULL), number(-1), fd(-1), 258 active(false), attached(false), 259 system(_system), pmem(_system->physmem), context(c), 260 gdbregs(cacheSize) 261{ 262 memset(gdbregs.regs, 0, gdbregs.bytes()); 263} 264 265BaseRemoteGDB::~BaseRemoteGDB() 266{ 267 if (event) 268 delete event; 269} 270 271string 272BaseRemoteGDB::name() 273{ 274 return system->name() + ".remote_gdb"; 275} 276 277bool 278BaseRemoteGDB::isattached() 279{ return attached; } 280 281void 282BaseRemoteGDB::attach(int f) 283{ 284 fd = f; 285 286 event = new Event(this, fd, POLLIN); 287 pollQueue.schedule(event); 288 289 attached = true; 290 DPRINTFN("remote gdb attached\n"); 291} 292 293void 294BaseRemoteGDB::detach() 295{ 296 attached = false; 297 close(fd); 298 fd = -1; 299 300 pollQueue.remove(event); 301 DPRINTFN("remote gdb detached\n"); 302} 303 304const char * 305BaseRemoteGDB::gdb_command(char cmd) 306{ 307 switch (cmd) { 308 case GDBSignal: return "KGDB_SIGNAL"; 309 case GDBSetBaud: return "KGDB_SET_BAUD"; 310 case GDBSetBreak: return "KGDB_SET_BREAK"; 311 case GDBCont: return "KGDB_CONT"; 312 case GDBAsyncCont: return "KGDB_ASYNC_CONT"; 313 case GDBDebug: return "KGDB_DEBUG"; 314 case GDBDetach: return "KGDB_DETACH"; 315 case GDBRegR: return "KGDB_REG_R"; 316 case GDBRegW: return "KGDB_REG_W"; 317 case GDBSetThread: return "KGDB_SET_THREAD"; 318 case GDBCycleStep: return "KGDB_CYCLE_STEP"; 319 case GDBSigCycleStep: return "KGDB_SIG_CYCLE_STEP"; 320 case GDBKill: return "KGDB_KILL"; 321 case GDBMemW: return "KGDB_MEM_W"; 322 case GDBMemR: return "KGDB_MEM_R"; 323 case GDBSetReg: return "KGDB_SET_REG"; 324 case GDBReadReg: return "KGDB_READ_REG"; 325 case GDBQueryVar: return "KGDB_QUERY_VAR"; 326 case GDBSetVar: return "KGDB_SET_VAR"; 327 case GDBReset: return "KGDB_RESET"; 328 case GDBStep: return "KGDB_STEP"; 329 case GDBAsyncStep: return "KGDB_ASYNC_STEP"; 330 case GDBThreadAlive: return "KGDB_THREAD_ALIVE"; 331 case GDBTargetExit: return "KGDB_TARGET_EXIT"; 332 case GDBBinaryDload: return "KGDB_BINARY_DLOAD"; 333 case GDBClrHwBkpt: return "KGDB_CLR_HW_BKPT"; 334 case GDBSetHwBkpt: return "KGDB_SET_HW_BKPT"; 335 case GDBStart: return "KGDB_START"; 336 case GDBEnd: return "KGDB_END"; 337 case GDBGoodP: return "KGDB_GOODP"; 338 case GDBBadP: return "KGDB_BADP"; 339 default: return "KGDB_UNKNOWN"; 340 } 341} 342 343///////////////////////// 344// 345// 346 347uint8_t 348BaseRemoteGDB::getbyte() 349{ 350 uint8_t b; 351 if (::read(fd, &b, 1) != 1) 352 warn("could not read byte from debugger"); 353 return b; 354} 355 356void 357BaseRemoteGDB::putbyte(uint8_t b) 358{ 359 if (::write(fd, &b, 1) != 1) 360 warn("could not write byte to debugger"); 361} 362 363// Send a packet to gdb 364void 365BaseRemoteGDB::send(const char *bp) 366{ 367 const char *p; 368 uint8_t csum, c; 369 370 DPRINTF(GDBSend, "send: %s\n", bp); 371 372 do { 373 p = bp; 374 //Start sending a packet 375 putbyte(GDBStart); 376 //Send the contents, and also keep a check sum. 377 for (csum = 0; (c = *p); p++) { 378 putbyte(c); 379 csum += c; 380 } 381 //Send the ending character. 382 putbyte(GDBEnd); 383 //Sent the checksum. 384 putbyte(i2digit(csum >> 4)); 385 putbyte(i2digit(csum)); 386 //Try transmitting over and over again until the other end doesn't send an 387 //error back. 388 } while ((c = getbyte() & 0x7f) == GDBBadP); 389} 390 391// Receive a packet from gdb 392int 393BaseRemoteGDB::recv(char *bp, int maxlen) 394{ 395 char *p; 396 int c, csum; 397 int len; 398 399 do { 400 p = bp; 401 csum = len = 0; 402 //Find the beginning of a packet 403 while ((c = getbyte()) != GDBStart) 404 ; 405 406 //Read until you find the end of the data in the packet, and keep 407 //track of the check sum. 408 while ((c = getbyte()) != GDBEnd && len < maxlen) { 409 c &= 0x7f; 410 csum += c; 411 *p++ = c; 412 len++; 413 } 414 415 //Mask the check sum, and terminate the command string. 416 csum &= 0xff; 417 *p = '\0'; 418 419 //If the command was too long, report an error. 420 if (len >= maxlen) { 421 putbyte(GDBBadP); 422 continue; 423 } 424 425 //Bring in the checksum. If the check sum matches, csum will be 0. 426 csum -= digit2i(getbyte()) * 16; 427 csum -= digit2i(getbyte()); 428 429 //If the check sum was correct 430 if (csum == 0) { 431 //Report that the packet was received correctly 432 putbyte(GDBGoodP); 433 // Sequence present? 434 if (bp[2] == ':') { 435 putbyte(bp[0]); 436 putbyte(bp[1]); 437 len -= 3; 438 memcpy(bp, bp+3, len); 439 } 440 break; 441 } 442 //Otherwise, report that there was a mistake. 443 putbyte(GDBBadP); 444 } while (1); 445 446 DPRINTF(GDBRecv, "recv: %s: %s\n", gdb_command(*bp), bp); 447 448 return (len); 449} 450 451// Read bytes from kernel address space for debugger. 452bool 453BaseRemoteGDB::read(Addr vaddr, size_t size, char *data) 454{ 455 static Addr lastaddr = 0; 456 static size_t lastsize = 0; 457 458 if (vaddr < 10) { 459 DPRINTF(GDBRead, "read: reading memory location zero!\n"); 460 vaddr = lastaddr + lastsize; 461 } 462 463 DPRINTF(GDBRead, "read: addr=%#x, size=%d", vaddr, size); 464 465#if FULL_SYSTEM 466 VirtualPort *port = context->getVirtPort(); 467#else 468 TranslatingPort *port = context->getMemPort(); 469#endif 470 port->readBlob(vaddr, (uint8_t*)data, size); 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 FULL_SYSTEM 508 VirtualPort *port = context->getVirtPort(); 509#else 510 TranslatingPort *port = context->getMemPort(); 511#endif 512 port->writeBlob(vaddr, (uint8_t*)data, size); 513#if !FULL_SYSTEM 514 delete port; 515#endif 516 517 return true; 518} 519 520PCEventQueue *BaseRemoteGDB::getPcEventQueue() 521{ 522 return &system->pcEventQueue; 523} 524 525BaseRemoteGDB::HardBreakpoint::HardBreakpoint(BaseRemoteGDB *_gdb, Addr pc) 526 : PCEvent(_gdb->getPcEventQueue(), "HardBreakpoint Event", pc), 527 gdb(_gdb), refcount(0) 528{ 529 DPRINTF(GDBMisc, "creating hardware breakpoint at %#x\n", evpc); 530} 531 532void 533BaseRemoteGDB::HardBreakpoint::process(ThreadContext *tc) 534{ 535 DPRINTF(GDBMisc, "handling hardware breakpoint at %#x\n", pc()); 536 537 if (tc == gdb->context) 538 gdb->trap(SIGTRAP); 539} 540 541bool 542BaseRemoteGDB::insertSoftBreak(Addr addr, size_t len) 543{ 544 if (len != sizeof(TheISA::MachInst)) 545 panic("invalid length\n"); 546 547 return insertHardBreak(addr, len); 548} 549 550bool 551BaseRemoteGDB::removeSoftBreak(Addr addr, size_t len) 552{ 553 if (len != sizeof(MachInst)) 554 panic("invalid length\n"); 555 556 return removeHardBreak(addr, len); 557} 558 559bool 560BaseRemoteGDB::insertHardBreak(Addr addr, size_t len) 561{ 562 if (len != sizeof(MachInst)) 563 panic("invalid length\n"); 564 565 DPRINTF(GDBMisc, "inserting hardware breakpoint at %#x\n", addr); 566 567 HardBreakpoint *&bkpt = hardBreakMap[addr]; 568 if (bkpt == 0) 569 bkpt = new HardBreakpoint(this, addr); 570 571 bkpt->refcount++; 572 573 return true; 574} 575 576bool 577BaseRemoteGDB::removeHardBreak(Addr addr, size_t len) 578{ 579 if (len != sizeof(MachInst)) 580 panic("invalid length\n"); 581 582 DPRINTF(GDBMisc, "removing hardware breakpoint at %#x\n", addr); 583 584 break_iter_t i = hardBreakMap.find(addr); 585 if (i == hardBreakMap.end()) 586 return false; 587 588 HardBreakpoint *hbp = (*i).second; 589 if (--hbp->refcount == 0) { 590 delete hbp; 591 hardBreakMap.erase(i); 592 } 593 594 return true; 595} 596 597void 598BaseRemoteGDB::setTempBreakpoint(Addr bkpt) 599{ 600 DPRINTF(GDBMisc, "setTempBreakpoint: addr=%#x\n", bkpt); 601 insertHardBreak(bkpt, sizeof(TheISA::MachInst)); 602} 603 604void 605BaseRemoteGDB::clearTempBreakpoint(Addr &bkpt) 606{ 607 DPRINTF(GDBMisc, "setTempBreakpoint: addr=%#x\n", bkpt); 608 removeHardBreak(bkpt, sizeof(TheISA::MachInst)); 609 bkpt = 0; 610} 611 612const char * 613BaseRemoteGDB::break_type(char c) 614{ 615 switch(c) { 616 case '0': return "software breakpoint"; 617 case '1': return "hardware breakpoint"; 618 case '2': return "write watchpoint"; 619 case '3': return "read watchpoint"; 620 case '4': return "access watchpoint"; 621 default: return "unknown breakpoint/watchpoint"; 622 } 623} 624 625// This function does all command processing for interfacing to a 626// remote gdb. Note that the error codes are ignored by gdb at 627// present, but might eventually become meaningful. (XXX) It might 628// makes sense to use POSIX errno values, because that is what the 629// gdb/remote.c functions want to return. 630bool 631BaseRemoteGDB::trap(int type) 632{ 633 uint64_t val; 634 size_t datalen, len; 635 char data[GDBPacketBufLen + 1]; 636 char *buffer; 637 size_t bufferSize; 638 const char *p; 639 char command, subcmd; 640 string var; 641 bool ret; 642 643 if (!attached) 644 return false; 645 646 bufferSize = gdbregs.bytes() * 2 + 256; 647 buffer = (char*)malloc(bufferSize); 648 649 TheISA::PCState pc = context->pcState(); 650 DPRINTF(GDBMisc, "trap: PC=%s\n", pc); 651 652 clearSingleStep(); 653 654 /* 655 * The first entry to this function is normally through 656 * a breakpoint trap in kgdb_connect(), in which case we 657 * must advance past the breakpoint because gdb will not. 658 * 659 * On the first entry here, we expect that gdb is not yet 660 * listening to us, so just enter the interaction loop. 661 * After the debugger is "active" (connected) it will be 662 * waiting for a "signaled" message from us. 663 */ 664 if (!active) 665 active = true; 666 else 667 // Tell remote host that an exception has occurred. 668 snprintf((char *)buffer, bufferSize, "S%02x", type); 669 send(buffer); 670 671 // Stick frame regs into our reg cache. 672 getregs(); 673 674 for (;;) { 675 datalen = recv(data, sizeof(data)); 676 data[sizeof(data) - 1] = 0; // Sentinel 677 command = data[0]; 678 subcmd = 0; 679 p = data + 1; 680 switch (command) { 681 682 case GDBSignal: 683 // if this command came from a running gdb, answer it -- 684 // the other guy has no way of knowing if we're in or out 685 // of this loop when he issues a "remote-signal". 686 snprintf((char *)buffer, bufferSize, 687 "S%02x", type); 688 send(buffer); 689 continue; 690 691 case GDBRegR: 692 if (2 * gdbregs.bytes() > bufferSize) 693 panic("buffer too small"); 694 695 mem2hex(buffer, gdbregs.regs, gdbregs.bytes()); 696 send(buffer); 697 continue; 698 699 case GDBRegW: 700 p = hex2mem(gdbregs.regs, p, gdbregs.bytes()); 701 if (p == NULL || *p != '\0') 702 send("E01"); 703 else { 704 setregs(); 705 send("OK"); 706 } 707 continue; 708 709#if 0 710 case GDBSetReg: 711 val = hex2i(&p); 712 if (*p++ != '=') { 713 send("E01"); 714 continue; 715 } 716 if (val < 0 && val >= KGDB_NUMREGS) { 717 send("E01"); 718 continue; 719 } 720 721 gdbregs.regs[val] = hex2i(&p); 722 setregs(); 723 send("OK"); 724 725 continue; 726#endif 727 728 case GDBMemR: 729 val = hex2i(&p); 730 if (*p++ != ',') { 731 send("E02"); 732 continue; 733 } 734 len = hex2i(&p); 735 if (*p != '\0') { 736 send("E03"); 737 continue; 738 } 739 if (len > bufferSize) { 740 send("E04"); 741 continue; 742 } 743 if (!acc(val, len)) { 744 send("E05"); 745 continue; 746 } 747 748 if (read(val, (size_t)len, (char *)buffer)) { 749 // variable length array would be nice, but C++ doesn't 750 // officially support those... 751 char *temp = new char[2*len+1]; 752 mem2hex(temp, buffer, len); 753 send(temp); 754 delete [] temp; 755 } else { 756 send("E05"); 757 } 758 continue; 759 760 case GDBMemW: 761 val = hex2i(&p); 762 if (*p++ != ',') { 763 send("E06"); 764 continue; 765 } 766 len = hex2i(&p); 767 if (*p++ != ':') { 768 send("E07"); 769 continue; 770 } 771 if (len > datalen - (p - data)) { 772 send("E08"); 773 continue; 774 } 775 p = hex2mem(buffer, p, bufferSize); 776 if (p == NULL) { 777 send("E09"); 778 continue; 779 } 780 if (!acc(val, len)) { 781 send("E0A"); 782 continue; 783 } 784 if (write(val, (size_t)len, (char *)buffer)) 785 send("OK"); 786 else 787 send("E0B"); 788 continue; 789 790 case GDBSetThread: 791 subcmd = *p++; 792 val = hex2i(&p); 793 if (val == 0) 794 send("OK"); 795 else 796 send("E01"); 797 continue; 798 799 case GDBDetach: 800 case GDBKill: 801 active = false; 802 clearSingleStep(); 803 detach(); 804 goto out; 805 806 case GDBAsyncCont: 807 subcmd = hex2i(&p); 808 if (*p++ == ';') { 809 val = hex2i(&p); 810 context->pcState(val); 811 } 812 clearSingleStep(); 813 goto out; 814 815 case GDBCont: 816 if (p - data < (ptrdiff_t)datalen) { 817 val = hex2i(&p); 818 context->pcState(val); 819 } 820 clearSingleStep(); 821 goto out; 822 823 case GDBAsyncStep: 824 subcmd = hex2i(&p); 825 if (*p++ == ';') { 826 val = hex2i(&p); 827 context->pcState(val); 828 } 829 setSingleStep(); 830 goto out; 831 832 case GDBStep: 833 if (p - data < (ptrdiff_t)datalen) { 834 val = hex2i(&p); 835 context->pcState(val); 836 } 837 setSingleStep(); 838 goto out; 839 840 case GDBClrHwBkpt: 841 subcmd = *p++; 842 if (*p++ != ',') send("E0D"); 843 val = hex2i(&p); 844 if (*p++ != ',') send("E0D"); 845 len = hex2i(&p); 846 847 DPRINTF(GDBMisc, "clear %s, addr=%#x, len=%d\n", 848 break_type(subcmd), val, len); 849 850 ret = false; 851 852 switch (subcmd) { 853 case '0': // software breakpoint 854 ret = removeSoftBreak(val, len); 855 break; 856 857 case '1': // hardware breakpoint 858 ret = removeHardBreak(val, len); 859 break; 860 861 case '2': // write watchpoint 862 case '3': // read watchpoint 863 case '4': // access watchpoint 864 default: // unknown 865 send(""); 866 break; 867 } 868 869 send(ret ? "OK" : "E0C"); 870 continue; 871 872 case GDBSetHwBkpt: 873 subcmd = *p++; 874 if (*p++ != ',') send("E0D"); 875 val = hex2i(&p); 876 if (*p++ != ',') send("E0D"); 877 len = hex2i(&p); 878 879 DPRINTF(GDBMisc, "set %s, addr=%#x, len=%d\n", 880 break_type(subcmd), val, len); 881 882 ret = false; 883 884 switch (subcmd) { 885 case '0': // software breakpoint 886 ret = insertSoftBreak(val, len); 887 break; 888 889 case '1': // hardware breakpoint 890 ret = insertHardBreak(val, len); 891 break; 892 893 case '2': // write watchpoint 894 case '3': // read watchpoint 895 case '4': // access watchpoint 896 default: // unknown 897 send(""); 898 break; 899 } 900 901 send(ret ? "OK" : "E0C"); 902 continue; 903 904 case GDBQueryVar: 905 var = string(p, datalen - 1); 906 if (var == "C") 907 send("QC0"); 908 else 909 send(""); 910 continue; 911 912 case GDBSetBaud: 913 case GDBSetBreak: 914 case GDBDebug: 915 case GDBCycleStep: 916 case GDBSigCycleStep: 917 case GDBReadReg: 918 case GDBSetVar: 919 case GDBReset: 920 case GDBThreadAlive: 921 case GDBTargetExit: 922 case GDBBinaryDload: 923 // Unsupported command 924 DPRINTF(GDBMisc, "Unsupported command: %s\n", 925 gdb_command(command)); 926 DDUMP(GDBMisc, (uint8_t *)data, datalen); 927 send(""); 928 continue; 929 930 default: 931 // Unknown command. 932 DPRINTF(GDBMisc, "Unknown command: %c(%#x)\n", 933 command, command); 934 send(""); 935 continue; 936 937 938 } 939 } 940 941 out: 942 free(buffer); 943 return true; 944} 945 946// Convert a hex digit into an integer. 947// This returns -1 if the argument passed is no valid hex digit. 948int 949BaseRemoteGDB::digit2i(char c) 950{ 951 if (c >= '0' && c <= '9') 952 return (c - '0'); 953 else if (c >= 'a' && c <= 'f') 954 return (c - 'a' + 10); 955 else if (c >= 'A' && c <= 'F') 956 957 return (c - 'A' + 10); 958 else 959 return (-1); 960} 961 962// Convert the low 4 bits of an integer into an hex digit. 963char 964BaseRemoteGDB::i2digit(int n) 965{ 966 return ("0123456789abcdef"[n & 0x0f]); 967} 968 969// Convert a byte array into an hex string. 970void 971BaseRemoteGDB::mem2hex(void *vdst, const void *vsrc, int len) 972{ 973 char *dst = (char *)vdst; 974 const char *src = (const char *)vsrc; 975 976 while (len--) { 977 *dst++ = i2digit(*src >> 4); 978 *dst++ = i2digit(*src++); 979 } 980 *dst = '\0'; 981} 982 983// Convert an hex string into a byte array. 984// This returns a pointer to the character following the last valid 985// hex digit. If the string ends in the middle of a byte, NULL is 986// returned. 987const char * 988BaseRemoteGDB::hex2mem(void *vdst, const char *src, int maxlen) 989{ 990 char *dst = (char *)vdst; 991 int msb, lsb; 992 993 while (*src && maxlen--) { 994 msb = digit2i(*src++); 995 if (msb < 0) 996 return (src - 1); 997 lsb = digit2i(*src++); 998 if (lsb < 0) 999 return (NULL); 1000 *dst++ = (msb << 4) | lsb; 1001 } 1002 return (src); 1003} 1004 1005// Convert an hex string into an integer. 1006// This returns a pointer to the character following the last valid 1007// hex digit. 1008Addr 1009BaseRemoteGDB::hex2i(const char **srcp) 1010{ 1011 const char *src = *srcp; 1012 Addr r = 0; 1013 int nibble; 1014 1015 while ((nibble = digit2i(*src)) >= 0) { 1016 r *= 16; 1017 r += nibble; 1018 src++; 1019 } 1020 *srcp = src; 1021 return (r); 1022} 1023 1024