remote_gdb.cc revision 5105:511fe87ea24c
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 "config/full_system.hh" 125 126#if FULL_SYSTEM 127#include "arch/vtophys.hh" 128#endif 129 130#include "base/intmath.hh" 131#include "base/remote_gdb.hh" 132#include "base/socket.hh" 133#include "base/trace.hh" 134#include "cpu/thread_context.hh" 135#include "cpu/static_inst.hh" 136//#include "mem/physical.hh" 137#include "mem/port.hh" 138#include "mem/translating_port.hh" 139#include "sim/system.hh" 140 141using namespace std; 142using namespace TheISA; 143 144#ifndef NDEBUG 145vector<BaseRemoteGDB *> debuggers; 146 147void 148debugger() 149{ 150 static int current_debugger = -1; 151 if (current_debugger >= 0 && current_debugger < debuggers.size()) { 152 BaseRemoteGDB *gdb = debuggers[current_debugger]; 153 if (!gdb->isattached()) 154 gdb->listener->accept(); 155 if (gdb->isattached()) 156 gdb->trap(SIGILL); 157 } 158} 159#endif 160 161/////////////////////////////////////////////////////////// 162// 163// 164// 165 166GDBListener::Event::Event(GDBListener *l, int fd, int e) 167 : PollEvent(fd, e), listener(l) 168{} 169 170void 171GDBListener::Event::process(int revent) 172{ 173 listener->accept(); 174} 175 176GDBListener::GDBListener(BaseRemoteGDB *g, int p) 177 : event(NULL), gdb(g), port(p) 178{ 179 assert(!gdb->listener); 180 gdb->listener = this; 181} 182 183GDBListener::~GDBListener() 184{ 185 if (event) 186 delete event; 187} 188 189string 190GDBListener::name() 191{ 192 return gdb->name() + ".listener"; 193} 194 195void 196GDBListener::listen() 197{ 198 while (!listener.listen(port, true)) { 199 DPRINTF(GDBMisc, "Can't bind port %d\n", port); 200 port++; 201 } 202 203 event = new Event(this, listener.getfd(), POLLIN); 204 pollQueue.schedule(event); 205 206#ifndef NDEBUG 207 gdb->number = debuggers.size(); 208 debuggers.push_back(gdb); 209#endif 210 211#ifndef NDEBUG 212 ccprintf(cerr, "%d: %s: listening for remote gdb #%d on port %d\n", 213 curTick, name(), gdb->number, port); 214#else 215 ccprintf(cerr, "%d: %s: listening for remote gdb on port %d\n", 216 curTick, name(), port); 217#endif 218} 219 220void 221GDBListener::accept() 222{ 223 if (!listener.islistening()) 224 panic("GDBListener::accept(): cannot accept if we're not listening!"); 225 226 int sfd = listener.accept(true); 227 228 if (sfd != -1) { 229 if (gdb->isattached()) 230 close(sfd); 231 else 232 gdb->attach(sfd); 233 } 234} 235 236BaseRemoteGDB::Event::Event(BaseRemoteGDB *g, int fd, int e) 237 : PollEvent(fd, e), gdb(g) 238{} 239 240void 241BaseRemoteGDB::Event::process(int revent) 242{ 243 if (revent & POLLIN) 244 gdb->trap(SIGILL); 245 else if (revent & POLLNVAL) 246 gdb->detach(); 247} 248 249BaseRemoteGDB::BaseRemoteGDB(System *_system, ThreadContext *c, size_t cacheSize) 250 : event(NULL), listener(NULL), number(-1), fd(-1), 251 active(false), attached(false), 252 system(_system), pmem(_system->physmem), context(c), 253 gdbregs(cacheSize) 254{ 255 memset(gdbregs.regs, 0, gdbregs.bytes()); 256} 257 258BaseRemoteGDB::~BaseRemoteGDB() 259{ 260 if (event) 261 delete event; 262} 263 264string 265BaseRemoteGDB::name() 266{ 267 return system->name() + ".remote_gdb"; 268} 269 270bool 271BaseRemoteGDB::isattached() 272{ return attached; } 273 274void 275BaseRemoteGDB::attach(int f) 276{ 277 fd = f; 278 279 event = new Event(this, fd, POLLIN); 280 pollQueue.schedule(event); 281 282 attached = true; 283 DPRINTFN("remote gdb attached\n"); 284} 285 286void 287BaseRemoteGDB::detach() 288{ 289 attached = false; 290 close(fd); 291 fd = -1; 292 293 pollQueue.remove(event); 294 DPRINTFN("remote gdb detached\n"); 295} 296 297const char * 298BaseRemoteGDB::gdb_command(char cmd) 299{ 300 switch (cmd) { 301 case GDBSignal: return "KGDB_SIGNAL"; 302 case GDBSetBaud: return "KGDB_SET_BAUD"; 303 case GDBSetBreak: return "KGDB_SET_BREAK"; 304 case GDBCont: return "KGDB_CONT"; 305 case GDBAsyncCont: return "KGDB_ASYNC_CONT"; 306 case GDBDebug: return "KGDB_DEBUG"; 307 case GDBDetach: return "KGDB_DETACH"; 308 case GDBRegR: return "KGDB_REG_R"; 309 case GDBRegW: return "KGDB_REG_W"; 310 case GDBSetThread: return "KGDB_SET_THREAD"; 311 case GDBCycleStep: return "KGDB_CYCLE_STEP"; 312 case GDBSigCycleStep: return "KGDB_SIG_CYCLE_STEP"; 313 case GDBKill: return "KGDB_KILL"; 314 case GDBMemW: return "KGDB_MEM_W"; 315 case GDBMemR: return "KGDB_MEM_R"; 316 case GDBSetReg: return "KGDB_SET_REG"; 317 case GDBReadReg: return "KGDB_READ_REG"; 318 case GDBQueryVar: return "KGDB_QUERY_VAR"; 319 case GDBSetVar: return "KGDB_SET_VAR"; 320 case GDBReset: return "KGDB_RESET"; 321 case GDBStep: return "KGDB_STEP"; 322 case GDBAsyncStep: return "KGDB_ASYNC_STEP"; 323 case GDBThreadAlive: return "KGDB_THREAD_ALIVE"; 324 case GDBTargetExit: return "KGDB_TARGET_EXIT"; 325 case GDBBinaryDload: return "KGDB_BINARY_DLOAD"; 326 case GDBClrHwBkpt: return "KGDB_CLR_HW_BKPT"; 327 case GDBSetHwBkpt: return "KGDB_SET_HW_BKPT"; 328 case GDBStart: return "KGDB_START"; 329 case GDBEnd: return "KGDB_END"; 330 case GDBGoodP: return "KGDB_GOODP"; 331 case GDBBadP: return "KGDB_BADP"; 332 default: return "KGDB_UNKNOWN"; 333 } 334} 335 336///////////////////////// 337// 338// 339 340uint8_t 341BaseRemoteGDB::getbyte() 342{ 343 uint8_t b; 344 ::read(fd, &b, 1); 345 return b; 346} 347 348void 349BaseRemoteGDB::putbyte(uint8_t b) 350{ 351 ::write(fd, &b, 1); 352} 353 354// Send a packet to gdb 355void 356BaseRemoteGDB::send(const char *bp) 357{ 358 const char *p; 359 uint8_t csum, c; 360 361 DPRINTF(GDBSend, "send: %s\n", bp); 362 363 do { 364 p = bp; 365 //Start sending a packet 366 putbyte(GDBStart); 367 //Send the contents, and also keep a check sum. 368 for (csum = 0; (c = *p); p++) { 369 putbyte(c); 370 csum += c; 371 } 372 //Send the ending character. 373 putbyte(GDBEnd); 374 //Sent the checksum. 375 putbyte(i2digit(csum >> 4)); 376 putbyte(i2digit(csum)); 377 //Try transmitting over and over again until the other end doesn't send an 378 //error back. 379 } while ((c = getbyte() & 0x7f) == GDBBadP); 380} 381 382// Receive a packet from gdb 383int 384BaseRemoteGDB::recv(char *bp, int maxlen) 385{ 386 char *p; 387 int c, csum; 388 int len; 389 390 do { 391 p = bp; 392 csum = len = 0; 393 //Find the beginning of a packet 394 while ((c = getbyte()) != GDBStart) 395 ; 396 397 //Read until you find the end of the data in the packet, and keep 398 //track of the check sum. 399 while ((c = getbyte()) != GDBEnd && len < maxlen) { 400 c &= 0x7f; 401 csum += c; 402 *p++ = c; 403 len++; 404 } 405 406 //Mask the check sum, and terminate the command string. 407 csum &= 0xff; 408 *p = '\0'; 409 410 //If the command was too long, report an error. 411 if (len >= maxlen) { 412 putbyte(GDBBadP); 413 continue; 414 } 415 416 //Bring in the checksum. If the check sum matches, csum will be 0. 417 csum -= digit2i(getbyte()) * 16; 418 csum -= digit2i(getbyte()); 419 420 //If the check sum was correct 421 if (csum == 0) { 422 //Report that the packet was received correctly 423 putbyte(GDBGoodP); 424 // Sequence present? 425 if (bp[2] == ':') { 426 putbyte(bp[0]); 427 putbyte(bp[1]); 428 len -= 3; 429 memcpy(bp, bp+3, len); 430 } 431 break; 432 } 433 //Otherwise, report that there was a mistake. 434 putbyte(GDBBadP); 435 } while (1); 436 437 DPRINTF(GDBRecv, "recv: %s: %s\n", gdb_command(*bp), bp); 438 439 return (len); 440} 441 442// Read bytes from kernel address space for debugger. 443bool 444BaseRemoteGDB::read(Addr vaddr, size_t size, char *data) 445{ 446 static Addr lastaddr = 0; 447 static size_t lastsize = 0; 448 449 if (vaddr < 10) { 450 DPRINTF(GDBRead, "read: reading memory location zero!\n"); 451 vaddr = lastaddr + lastsize; 452 } 453 454 DPRINTF(GDBRead, "read: addr=%#x, size=%d", vaddr, size); 455 456#if FULL_SYSTEM 457 VirtualPort *port = context->getVirtPort(context); 458#else 459 TranslatingPort *port = context->getMemPort(); 460#endif 461 port->readBlob(vaddr, (uint8_t*)data, size); 462#if FULL_SYSTEM 463 context->delVirtPort(port); 464#endif 465 466#if TRACING_ON 467 if (DTRACE(GDBRead)) { 468 if (DTRACE(GDBExtra)) { 469 char buf[1024]; 470 mem2hex(buf, data, size); 471 DPRINTFNR(": %s\n", buf); 472 } else 473 DPRINTFNR("\n"); 474 } 475#endif 476 477 return true; 478} 479 480// Write bytes to kernel address space for debugger. 481bool 482BaseRemoteGDB::write(Addr vaddr, size_t size, const char *data) 483{ 484 static Addr lastaddr = 0; 485 static size_t lastsize = 0; 486 487 if (vaddr < 10) { 488 DPRINTF(GDBWrite, "write: writing memory location zero!\n"); 489 vaddr = lastaddr + lastsize; 490 } 491 492 if (DTRACE(GDBWrite)) { 493 DPRINTFN("write: addr=%#x, size=%d", vaddr, size); 494 if (DTRACE(GDBExtra)) { 495 char buf[1024]; 496 mem2hex(buf, data, size); 497 DPRINTFNR(": %s\n", buf); 498 } else 499 DPRINTFNR("\n"); 500 } 501#if FULL_SYSTEM 502 VirtualPort *port = context->getVirtPort(context); 503#else 504 TranslatingPort *port = context->getMemPort(); 505#endif 506 port->writeBlob(vaddr, (uint8_t*)data, size); 507#if FULL_SYSTEM 508 context->delVirtPort(port); 509#else 510 delete port; 511#endif 512 513 return true; 514} 515 516PCEventQueue *BaseRemoteGDB::getPcEventQueue() 517{ 518 return &system->pcEventQueue; 519} 520 521BaseRemoteGDB::HardBreakpoint::HardBreakpoint(BaseRemoteGDB *_gdb, Addr pc) 522 : PCEvent(_gdb->getPcEventQueue(), "HardBreakpoint Event", pc), 523 gdb(_gdb), refcount(0) 524{ 525 DPRINTF(GDBMisc, "creating hardware breakpoint at %#x\n", evpc); 526} 527 528void 529BaseRemoteGDB::HardBreakpoint::process(ThreadContext *tc) 530{ 531 DPRINTF(GDBMisc, "handling hardware breakpoint at %#x\n", pc()); 532 533 if (tc == gdb->context) 534 gdb->trap(SIGTRAP); 535} 536 537bool 538BaseRemoteGDB::insertSoftBreak(Addr addr, size_t len) 539{ 540 if (len != sizeof(TheISA::MachInst)) 541 panic("invalid length\n"); 542 543 return insertHardBreak(addr, len); 544} 545 546bool 547BaseRemoteGDB::removeSoftBreak(Addr addr, size_t len) 548{ 549 if (len != sizeof(MachInst)) 550 panic("invalid length\n"); 551 552 return removeHardBreak(addr, len); 553} 554 555bool 556BaseRemoteGDB::insertHardBreak(Addr addr, size_t len) 557{ 558 if (len != sizeof(MachInst)) 559 panic("invalid length\n"); 560 561 DPRINTF(GDBMisc, "inserting hardware breakpoint at %#x\n", addr); 562 563 HardBreakpoint *&bkpt = hardBreakMap[addr]; 564 if (bkpt == 0) 565 bkpt = new HardBreakpoint(this, addr); 566 567 bkpt->refcount++; 568 569 return true; 570} 571 572bool 573BaseRemoteGDB::removeHardBreak(Addr addr, size_t len) 574{ 575 if (len != sizeof(MachInst)) 576 panic("invalid length\n"); 577 578 DPRINTF(GDBMisc, "removing hardware breakpoint at %#x\n", addr); 579 580 break_iter_t i = hardBreakMap.find(addr); 581 if (i == hardBreakMap.end()) 582 return false; 583 584 HardBreakpoint *hbp = (*i).second; 585 if (--hbp->refcount == 0) { 586 delete hbp; 587 hardBreakMap.erase(i); 588 } 589 590 return true; 591} 592 593void 594BaseRemoteGDB::setTempBreakpoint(Addr bkpt) 595{ 596 DPRINTF(GDBMisc, "setTempBreakpoint: addr=%#x\n", bkpt); 597 insertHardBreak(bkpt, sizeof(TheISA::MachInst)); 598} 599 600void 601BaseRemoteGDB::clearTempBreakpoint(Addr &bkpt) 602{ 603 DPRINTF(GDBMisc, "setTempBreakpoint: addr=%#x\n", bkpt); 604 removeHardBreak(bkpt, sizeof(TheISA::MachInst)); 605 bkpt = 0; 606} 607 608const char * 609BaseRemoteGDB::break_type(char c) 610{ 611 switch(c) { 612 case '0': return "software breakpoint"; 613 case '1': return "hardware breakpoint"; 614 case '2': return "write watchpoint"; 615 case '3': return "read watchpoint"; 616 case '4': return "access watchpoint"; 617 default: return "unknown breakpoint/watchpoint"; 618 } 619} 620 621// This function does all command processing for interfacing to a 622// remote gdb. Note that the error codes are ignored by gdb at 623// present, but might eventually become meaningful. (XXX) It might 624// makes sense to use POSIX errno values, because that is what the 625// gdb/remote.c functions want to return. 626bool 627BaseRemoteGDB::trap(int type) 628{ 629 uint64_t val; 630 size_t datalen, len; 631 char data[GDBPacketBufLen + 1]; 632 char *buffer; 633 int bufferSize; 634 const char *p; 635 char command, subcmd; 636 string var; 637 bool ret; 638 639 if (!attached) 640 return false; 641 642 bufferSize = gdbregs.bytes() * 2 + 256; 643 buffer = (char*)malloc(bufferSize); 644 645 DPRINTF(GDBMisc, "trap: PC=%#x NPC=%#x\n", 646 context->readPC(), context->readNextPC()); 647 648 clearSingleStep(); 649 650 /* 651 * The first entry to this function is normally through 652 * a breakpoint trap in kgdb_connect(), in which case we 653 * must advance past the breakpoint because gdb will not. 654 * 655 * On the first entry here, we expect that gdb is not yet 656 * listening to us, so just enter the interaction loop. 657 * After the debugger is "active" (connected) it will be 658 * waiting for a "signaled" message from us. 659 */ 660 if (!active) 661 active = true; 662 else 663 // Tell remote host that an exception has occurred. 664 snprintf((char *)buffer, bufferSize, "S%02x", type); 665 send(buffer); 666 667 // Stick frame regs into our reg cache. 668 getregs(); 669 670 for (;;) { 671 datalen = recv(data, sizeof(data)); 672 data[sizeof(data) - 1] = 0; // Sentinel 673 command = data[0]; 674 subcmd = 0; 675 p = data + 1; 676 switch (command) { 677 678 case GDBSignal: 679 // if this command came from a running gdb, answer it -- 680 // the other guy has no way of knowing if we're in or out 681 // of this loop when he issues a "remote-signal". 682 snprintf((char *)buffer, bufferSize, 683 "S%02x", type); 684 send(buffer); 685 continue; 686 687 case GDBRegR: 688 if (2 * gdbregs.bytes() > bufferSize) 689 panic("buffer too small"); 690 691 mem2hex(buffer, gdbregs.regs, gdbregs.bytes()); 692 send(buffer); 693 continue; 694 695 case GDBRegW: 696 p = hex2mem(gdbregs.regs, p, gdbregs.bytes()); 697 if (p == NULL || *p != '\0') 698 send("E01"); 699 else { 700 setregs(); 701 send("OK"); 702 } 703 continue; 704 705#if 0 706 case GDBSetReg: 707 val = hex2i(&p); 708 if (*p++ != '=') { 709 send("E01"); 710 continue; 711 } 712 if (val < 0 && val >= KGDB_NUMREGS) { 713 send("E01"); 714 continue; 715 } 716 717 gdbregs.regs[val] = hex2i(&p); 718 setregs(); 719 send("OK"); 720 721 continue; 722#endif 723 724 case GDBMemR: 725 val = hex2i(&p); 726 if (*p++ != ',') { 727 send("E02"); 728 continue; 729 } 730 len = hex2i(&p); 731 if (*p != '\0') { 732 send("E03"); 733 continue; 734 } 735 if (len > bufferSize) { 736 send("E04"); 737 continue; 738 } 739 if (!acc(val, len)) { 740 send("E05"); 741 continue; 742 } 743 744 if (read(val, (size_t)len, (char *)buffer)) { 745 // variable length array would be nice, but C++ doesn't 746 // officially support those... 747 char *temp = new char[2*len+1]; 748 mem2hex(temp, buffer, len); 749 send(temp); 750 delete [] temp; 751 } else { 752 send("E05"); 753 } 754 continue; 755 756 case GDBMemW: 757 val = hex2i(&p); 758 if (*p++ != ',') { 759 send("E06"); 760 continue; 761 } 762 len = hex2i(&p); 763 if (*p++ != ':') { 764 send("E07"); 765 continue; 766 } 767 if (len > datalen - (p - data)) { 768 send("E08"); 769 continue; 770 } 771 p = hex2mem(buffer, p, bufferSize); 772 if (p == NULL) { 773 send("E09"); 774 continue; 775 } 776 if (!acc(val, len)) { 777 send("E0A"); 778 continue; 779 } 780 if (write(val, (size_t)len, (char *)buffer)) 781 send("OK"); 782 else 783 send("E0B"); 784 continue; 785 786 case GDBSetThread: 787 subcmd = *p++; 788 val = hex2i(&p); 789 if (val == 0) 790 send("OK"); 791 else 792 send("E01"); 793 continue; 794 795 case GDBDetach: 796 case GDBKill: 797 active = false; 798 clearSingleStep(); 799 detach(); 800 goto out; 801 802 case GDBAsyncCont: 803 subcmd = hex2i(&p); 804 if (*p++ == ';') { 805 val = hex2i(&p); 806 context->setPC(val); 807 context->setNextPC(val + sizeof(MachInst)); 808 } 809 clearSingleStep(); 810 goto out; 811 812 case GDBCont: 813 if (p - data < datalen) { 814 val = hex2i(&p); 815 context->setPC(val); 816 context->setNextPC(val + sizeof(MachInst)); 817 } 818 clearSingleStep(); 819 goto out; 820 821 case GDBAsyncStep: 822 subcmd = hex2i(&p); 823 if (*p++ == ';') { 824 val = hex2i(&p); 825 context->setPC(val); 826 context->setNextPC(val + sizeof(MachInst)); 827 } 828 setSingleStep(); 829 goto out; 830 831 case GDBStep: 832 if (p - data < datalen) { 833 val = hex2i(&p); 834 context->setPC(val); 835 context->setNextPC(val + sizeof(MachInst)); 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