remote_gdb.cc revision 3960:1dca397b2bab
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#else 465 delete port; 466#endif 467 468#if TRACING_ON 469 if (DTRACE(GDBRead)) { 470 if (DTRACE(GDBExtra)) { 471 char buf[1024]; 472 mem2hex(buf, data, size); 473 DPRINTFNR(": %s\n", buf); 474 } else 475 DPRINTFNR("\n"); 476 } 477#endif 478 479 return true; 480} 481 482// Write bytes to kernel address space for debugger. 483bool 484BaseRemoteGDB::write(Addr vaddr, size_t size, const char *data) 485{ 486 static Addr lastaddr = 0; 487 static size_t lastsize = 0; 488 489 if (vaddr < 10) { 490 DPRINTF(GDBWrite, "write: writing memory location zero!\n"); 491 vaddr = lastaddr + lastsize; 492 } 493 494 if (DTRACE(GDBWrite)) { 495 DPRINTFN("write: addr=%#x, size=%d", vaddr, size); 496 if (DTRACE(GDBExtra)) { 497 char buf[1024]; 498 mem2hex(buf, data, size); 499 DPRINTFNR(": %s\n", buf); 500 } else 501 DPRINTFNR("\n"); 502 } 503#if FULL_SYSTEM 504 VirtualPort *port = context->getVirtPort(context); 505#else 506 TranslatingPort *port = context->getMemPort(); 507#endif 508 port->writeBlob(vaddr, (uint8_t*)data, size); 509#if FULL_SYSTEM 510 context->delVirtPort(port); 511#else 512 delete port; 513#endif 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[gdbregs.bytes() * 2 + 256]; 635 const char *p; 636 char command, subcmd; 637 string var; 638 bool ret; 639 640 if (!attached) 641 return false; 642 643 DPRINTF(GDBMisc, "trap: PC=%#x NPC=%#x\n", 644 context->readPC(), context->readNextPC()); 645 646 clearSingleStep(); 647 648 /* 649 * The first entry to this function is normally through 650 * a breakpoint trap in kgdb_connect(), in which case we 651 * must advance past the breakpoint because gdb will not. 652 * 653 * On the first entry here, we expect that gdb is not yet 654 * listening to us, so just enter the interaction loop. 655 * After the debugger is "active" (connected) it will be 656 * waiting for a "signaled" message from us. 657 */ 658 if (!active) 659 active = true; 660 else 661 // Tell remote host that an exception has occurred. 662 snprintf((char *)buffer, sizeof(buffer), "S%02x", type); 663 send(buffer); 664 665 // Stick frame regs into our reg cache. 666 getregs(); 667 668 for (;;) { 669 datalen = recv(data, sizeof(data)); 670 data[sizeof(data) - 1] = 0; // Sentinel 671 command = data[0]; 672 subcmd = 0; 673 p = data + 1; 674 switch (command) { 675 676 case GDBSignal: 677 // if this command came from a running gdb, answer it -- 678 // the other guy has no way of knowing if we're in or out 679 // of this loop when he issues a "remote-signal". 680 snprintf((char *)buffer, sizeof(buffer), 681 "S%02x", type); 682 send(buffer); 683 continue; 684 685 case GDBRegR: 686 if (2 * gdbregs.bytes() > sizeof(buffer)) 687 panic("buffer too small"); 688 689 mem2hex(buffer, gdbregs.regs, gdbregs.bytes()); 690 send(buffer); 691 continue; 692 693 case GDBRegW: 694 p = hex2mem(gdbregs.regs, p, gdbregs.bytes()); 695 if (p == NULL || *p != '\0') 696 send("E01"); 697 else { 698 setregs(); 699 send("OK"); 700 } 701 continue; 702 703#if 0 704 case GDBSetReg: 705 val = hex2i(&p); 706 if (*p++ != '=') { 707 send("E01"); 708 continue; 709 } 710 if (val < 0 && val >= KGDB_NUMREGS) { 711 send("E01"); 712 continue; 713 } 714 715 gdbregs.regs[val] = hex2i(&p); 716 setregs(); 717 send("OK"); 718 719 continue; 720#endif 721 722 case GDBMemR: 723 val = hex2i(&p); 724 if (*p++ != ',') { 725 send("E02"); 726 continue; 727 } 728 len = hex2i(&p); 729 if (*p != '\0') { 730 send("E03"); 731 continue; 732 } 733 if (len > sizeof(buffer)) { 734 send("E04"); 735 continue; 736 } 737 if (!acc(val, len)) { 738 send("E05"); 739 continue; 740 } 741 742 if (read(val, (size_t)len, (char *)buffer)) { 743 // variable length array would be nice, but C++ doesn't 744 // officially support those... 745 char *temp = new char[2*len+1]; 746 mem2hex(temp, buffer, len); 747 send(temp); 748 delete [] temp; 749 } else { 750 send("E05"); 751 } 752 continue; 753 754 case GDBMemW: 755 val = hex2i(&p); 756 if (*p++ != ',') { 757 send("E06"); 758 continue; 759 } 760 len = hex2i(&p); 761 if (*p++ != ':') { 762 send("E07"); 763 continue; 764 } 765 if (len > datalen - (p - data)) { 766 send("E08"); 767 continue; 768 } 769 p = hex2mem(buffer, p, sizeof(buffer)); 770 if (p == NULL) { 771 send("E09"); 772 continue; 773 } 774 if (!acc(val, len)) { 775 send("E0A"); 776 continue; 777 } 778 if (write(val, (size_t)len, (char *)buffer)) 779 send("OK"); 780 else 781 send("E0B"); 782 continue; 783 784 case GDBSetThread: 785 subcmd = *p++; 786 val = hex2i(&p); 787 if (val == 0) 788 send("OK"); 789 else 790 send("E01"); 791 continue; 792 793 case GDBDetach: 794 case GDBKill: 795 active = false; 796 clearSingleStep(); 797 detach(); 798 goto out; 799 800 case GDBAsyncCont: 801 subcmd = hex2i(&p); 802 if (*p++ == ';') { 803 val = hex2i(&p); 804 context->setPC(val); 805 context->setNextPC(val + sizeof(MachInst)); 806 } 807 clearSingleStep(); 808 goto out; 809 810 case GDBCont: 811 if (p - data < datalen) { 812 val = hex2i(&p); 813 context->setPC(val); 814 context->setNextPC(val + sizeof(MachInst)); 815 } 816 clearSingleStep(); 817 goto out; 818 819 case GDBAsyncStep: 820 subcmd = hex2i(&p); 821 if (*p++ == ';') { 822 val = hex2i(&p); 823 context->setPC(val); 824 context->setNextPC(val + sizeof(MachInst)); 825 } 826 setSingleStep(); 827 goto out; 828 829 case GDBStep: 830 if (p - data < datalen) { 831 val = hex2i(&p); 832 context->setPC(val); 833 context->setNextPC(val + sizeof(MachInst)); 834 } 835 setSingleStep(); 836 goto out; 837 838 case GDBClrHwBkpt: 839 subcmd = *p++; 840 if (*p++ != ',') send("E0D"); 841 val = hex2i(&p); 842 if (*p++ != ',') send("E0D"); 843 len = hex2i(&p); 844 845 DPRINTF(GDBMisc, "clear %s, addr=%#x, len=%d\n", 846 break_type(subcmd), val, len); 847 848 ret = false; 849 850 switch (subcmd) { 851 case '0': // software breakpoint 852 ret = removeSoftBreak(val, len); 853 break; 854 855 case '1': // hardware breakpoint 856 ret = removeHardBreak(val, len); 857 break; 858 859 case '2': // write watchpoint 860 case '3': // read watchpoint 861 case '4': // access watchpoint 862 default: // unknown 863 send(""); 864 break; 865 } 866 867 send(ret ? "OK" : "E0C"); 868 continue; 869 870 case GDBSetHwBkpt: 871 subcmd = *p++; 872 if (*p++ != ',') send("E0D"); 873 val = hex2i(&p); 874 if (*p++ != ',') send("E0D"); 875 len = hex2i(&p); 876 877 DPRINTF(GDBMisc, "set %s, addr=%#x, len=%d\n", 878 break_type(subcmd), val, len); 879 880 ret = false; 881 882 switch (subcmd) { 883 case '0': // software breakpoint 884 ret = insertSoftBreak(val, len); 885 break; 886 887 case '1': // hardware breakpoint 888 ret = insertHardBreak(val, len); 889 break; 890 891 case '2': // write watchpoint 892 case '3': // read watchpoint 893 case '4': // access watchpoint 894 default: // unknown 895 send(""); 896 break; 897 } 898 899 send(ret ? "OK" : "E0C"); 900 continue; 901 902 case GDBQueryVar: 903 var = string(p, datalen - 1); 904 if (var == "C") 905 send("QC0"); 906 else 907 send(""); 908 continue; 909 910 case GDBSetBaud: 911 case GDBSetBreak: 912 case GDBDebug: 913 case GDBCycleStep: 914 case GDBSigCycleStep: 915 case GDBReadReg: 916 case GDBSetVar: 917 case GDBReset: 918 case GDBThreadAlive: 919 case GDBTargetExit: 920 case GDBBinaryDload: 921 // Unsupported command 922 DPRINTF(GDBMisc, "Unsupported command: %s\n", 923 gdb_command(command)); 924 DDUMP(GDBMisc, (uint8_t *)data, datalen); 925 send(""); 926 continue; 927 928 default: 929 // Unknown command. 930 DPRINTF(GDBMisc, "Unknown command: %c(%#x)\n", 931 command, command); 932 send(""); 933 continue; 934 935 936 } 937 } 938 939 out: 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