remote_gdb.cc revision 3550
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 "arch/vtophys.hh" 125#include "base/intmath.hh" 126#include "base/remote_gdb.hh" 127#include "base/socket.hh" 128#include "base/trace.hh" 129#include "config/full_system.hh" 130#include "cpu/thread_context.hh" 131#include "cpu/static_inst.hh" 132#include "mem/physical.hh" 133#include "mem/port.hh" 134#include "sim/system.hh" 135 136using namespace std; 137using namespace TheISA; 138 139#ifndef NDEBUG 140vector<BaseRemoteGDB *> debuggers; 141 142void 143debugger() 144{ 145 static int current_debugger = -1; 146 if (current_debugger >= 0 && current_debugger < debuggers.size()) { 147 BaseRemoteGDB *gdb = debuggers[current_debugger]; 148 if (!gdb->isattached()) 149 gdb->listener->accept(); 150 if (gdb->isattached()) 151 gdb->trap(SIGILL); 152 } 153} 154#endif 155 156/////////////////////////////////////////////////////////// 157// 158// 159// 160 161GDBListener::Event::Event(GDBListener *l, int fd, int e) 162 : PollEvent(fd, e), listener(l) 163{} 164 165void 166GDBListener::Event::process(int revent) 167{ 168 listener->accept(); 169} 170 171GDBListener::GDBListener(BaseRemoteGDB *g, int p) 172 : event(NULL), gdb(g), port(p) 173{ 174 assert(!gdb->listener); 175 gdb->listener = this; 176} 177 178GDBListener::~GDBListener() 179{ 180 if (event) 181 delete event; 182} 183 184string 185GDBListener::name() 186{ 187 return gdb->name() + ".listener"; 188} 189 190void 191GDBListener::listen() 192{ 193 while (!listener.listen(port, true)) { 194 DPRINTF(GDBMisc, "Can't bind port %d\n", port); 195 port++; 196 } 197 198 event = new Event(this, listener.getfd(), POLLIN); 199 pollQueue.schedule(event); 200 201#ifndef NDEBUG 202 gdb->number = debuggers.size(); 203 debuggers.push_back(gdb); 204#endif 205 206#ifndef NDEBUG 207 ccprintf(cerr, "%d: %s: listening for remote gdb #%d on port %d\n", 208 curTick, name(), gdb->number, port); 209#else 210 ccprintf(cerr, "%d: %s: listening for remote gdb on port %d\n", 211 curTick, name(), port); 212#endif 213} 214 215void 216GDBListener::accept() 217{ 218 if (!listener.islistening()) 219 panic("GDBListener::accept(): cannot accept if we're not listening!"); 220 221 int sfd = listener.accept(true); 222 223 if (sfd != -1) { 224 if (gdb->isattached()) 225 close(sfd); 226 else 227 gdb->attach(sfd); 228 } 229} 230 231BaseRemoteGDB::Event::Event(BaseRemoteGDB *g, int fd, int e) 232 : PollEvent(fd, e), gdb(g) 233{} 234 235void 236BaseRemoteGDB::Event::process(int revent) 237{ 238 if (revent & POLLIN) 239 gdb->trap(SIGILL); 240 else if (revent & POLLNVAL) 241 gdb->detach(); 242} 243 244BaseRemoteGDB::BaseRemoteGDB(System *_system, ThreadContext *c, size_t cacheSize) 245 : event(NULL), listener(NULL), number(-1), fd(-1), 246 active(false), attached(false), 247 system(_system), pmem(_system->physmem), context(c), 248 gdbregs(cacheSize) 249{ 250 memset(gdbregs.regs, 0, gdbregs.size); 251} 252 253BaseRemoteGDB::~BaseRemoteGDB() 254{ 255 if (event) 256 delete event; 257} 258 259string 260BaseRemoteGDB::name() 261{ 262 return system->name() + ".remote_gdb"; 263} 264 265bool 266BaseRemoteGDB::isattached() 267{ return attached; } 268 269void 270BaseRemoteGDB::attach(int f) 271{ 272 fd = f; 273 274 event = new Event(this, fd, POLLIN); 275 pollQueue.schedule(event); 276 277 attached = true; 278 DPRINTFN("remote gdb attached\n"); 279} 280 281void 282BaseRemoteGDB::detach() 283{ 284 attached = false; 285 close(fd); 286 fd = -1; 287 288 pollQueue.remove(event); 289 DPRINTFN("remote gdb detached\n"); 290} 291 292const char * 293BaseRemoteGDB::gdb_command(char cmd) 294{ 295 switch (cmd) { 296 case GDBSignal: return "KGDB_SIGNAL"; 297 case GDBSetBaud: return "KGDB_SET_BAUD"; 298 case GDBSetBreak: return "KGDB_SET_BREAK"; 299 case GDBCont: return "KGDB_CONT"; 300 case GDBAsyncCont: return "KGDB_ASYNC_CONT"; 301 case GDBDebug: return "KGDB_DEBUG"; 302 case GDBDetach: return "KGDB_DETACH"; 303 case GDBRegR: return "KGDB_REG_R"; 304 case GDBRegW: return "KGDB_REG_W"; 305 case GDBSetThread: return "KGDB_SET_THREAD"; 306 case GDBCycleStep: return "KGDB_CYCLE_STEP"; 307 case GDBSigCycleStep: return "KGDB_SIG_CYCLE_STEP"; 308 case GDBKill: return "KGDB_KILL"; 309 case GDBMemW: return "KGDB_MEM_W"; 310 case GDBMemR: return "KGDB_MEM_R"; 311 case GDBSetReg: return "KGDB_SET_REG"; 312 case GDBReadReg: return "KGDB_READ_REG"; 313 case GDBQueryVar: return "KGDB_QUERY_VAR"; 314 case GDBSetVar: return "KGDB_SET_VAR"; 315 case GDBReset: return "KGDB_RESET"; 316 case GDBStep: return "KGDB_STEP"; 317 case GDBAsyncStep: return "KGDB_ASYNC_STEP"; 318 case GDBThreadAlive: return "KGDB_THREAD_ALIVE"; 319 case GDBTargetExit: return "KGDB_TARGET_EXIT"; 320 case GDBBinaryDload: return "KGDB_BINARY_DLOAD"; 321 case GDBClrHwBkpt: return "KGDB_CLR_HW_BKPT"; 322 case GDBSetHwBkpt: return "KGDB_SET_HW_BKPT"; 323 case GDBStart: return "KGDB_START"; 324 case GDBEnd: return "KGDB_END"; 325 case GDBGoodP: return "KGDB_GOODP"; 326 case GDBBadP: return "KGDB_BADP"; 327 default: return "KGDB_UNKNOWN"; 328 } 329} 330 331///////////////////////// 332// 333// 334 335uint8_t 336BaseRemoteGDB::getbyte() 337{ 338 uint8_t b; 339 ::read(fd, &b, 1); 340 return b; 341} 342 343void 344BaseRemoteGDB::putbyte(uint8_t b) 345{ 346 ::write(fd, &b, 1); 347} 348 349// Send a packet to gdb 350void 351BaseRemoteGDB::send(const char *bp) 352{ 353 const char *p; 354 uint8_t csum, c; 355 356 DPRINTF(GDBSend, "send: %s\n", bp); 357 358 do { 359 p = bp; 360 //Start sending a packet 361 putbyte(GDBStart); 362 //Send the contents, and also keep a check sum. 363 for (csum = 0; (c = *p); p++) { 364 putbyte(c); 365 csum += c; 366 } 367 //Send the ending character. 368 putbyte(GDBEnd); 369 //Sent the checksum. 370 putbyte(i2digit(csum >> 4)); 371 putbyte(i2digit(csum)); 372 //Try transmitting over and over again until the other end doesn't send an 373 //error back. 374 } while ((c = getbyte() & 0x7f) == GDBBadP); 375} 376 377// Receive a packet from gdb 378int 379BaseRemoteGDB::recv(char *bp, int maxlen) 380{ 381 char *p; 382 int c, csum; 383 int len; 384 385 do { 386 p = bp; 387 csum = len = 0; 388 //Find the beginning of a packet 389 while ((c = getbyte()) != GDBStart) 390 ; 391 392 //Read until you find the end of the data in the packet, and keep 393 //track of the check sum. 394 while ((c = getbyte()) != GDBEnd && len < maxlen) { 395 c &= 0x7f; 396 csum += c; 397 *p++ = c; 398 len++; 399 } 400 401 //Mask the check sum, and terminate the command string. 402 csum &= 0xff; 403 *p = '\0'; 404 405 //If the command was too long, report an error. 406 if (len >= maxlen) { 407 putbyte(GDBBadP); 408 continue; 409 } 410 411 //Bring in the checksum. If the check sum matches, csum will be 0. 412 csum -= digit2i(getbyte()) * 16; 413 csum -= digit2i(getbyte()); 414 415 //If the check sum was correct 416 if (csum == 0) { 417 //Report that the packet was received correctly 418 putbyte(GDBGoodP); 419 // Sequence present? 420 if (bp[2] == ':') { 421 putbyte(bp[0]); 422 putbyte(bp[1]); 423 len -= 3; 424 bcopy(bp + 3, bp, len); 425 } 426 break; 427 } 428 //Otherwise, report that there was a mistake. 429 putbyte(GDBBadP); 430 } while (1); 431 432 DPRINTF(GDBRecv, "recv: %s: %s\n", gdb_command(*bp), bp); 433 434 return (len); 435} 436 437// Read bytes from kernel address space for debugger. 438bool 439BaseRemoteGDB::read(Addr vaddr, size_t size, char *data) 440{ 441 static Addr lastaddr = 0; 442 static size_t lastsize = 0; 443 444 if (vaddr < 10) { 445 DPRINTF(GDBRead, "read: reading memory location zero!\n"); 446 vaddr = lastaddr + lastsize; 447 } 448 449 DPRINTF(GDBRead, "read: addr=%#x, size=%d", vaddr, size); 450 451 VirtualPort *vp = context->getVirtPort(context); 452 vp->readBlob(vaddr, (uint8_t*)data, size); 453 context->delVirtPort(vp); 454 455#if TRACING_ON 456 if (DTRACE(GDBRead)) { 457 if (DTRACE(GDBExtra)) { 458 char buf[1024]; 459 mem2hex(buf, data, size); 460 DPRINTFNR(": %s\n", buf); 461 } else 462 DPRINTFNR("\n"); 463 } 464#endif 465 466 return true; 467} 468 469// Write bytes to kernel address space for debugger. 470bool 471BaseRemoteGDB::write(Addr vaddr, size_t size, const char *data) 472{ 473 static Addr lastaddr = 0; 474 static size_t lastsize = 0; 475 476 if (vaddr < 10) { 477 DPRINTF(GDBWrite, "write: writing memory location zero!\n"); 478 vaddr = lastaddr + lastsize; 479 } 480 481 if (DTRACE(GDBWrite)) { 482 DPRINTFN("write: addr=%#x, size=%d", vaddr, size); 483 if (DTRACE(GDBExtra)) { 484 char buf[1024]; 485 mem2hex(buf, data, size); 486 DPRINTFNR(": %s\n", buf); 487 } else 488 DPRINTFNR("\n"); 489 } 490 VirtualPort *vp = context->getVirtPort(context); 491 vp->writeBlob(vaddr, (uint8_t*)data, size); 492 context->delVirtPort(vp); 493 494 return true; 495} 496 497PCEventQueue *BaseRemoteGDB::getPcEventQueue() 498{ 499 return &system->pcEventQueue; 500} 501 502BaseRemoteGDB::HardBreakpoint::HardBreakpoint(BaseRemoteGDB *_gdb, Addr pc) 503 : PCEvent(_gdb->getPcEventQueue(), "HardBreakpoint Event", pc), 504 gdb(_gdb), refcount(0) 505{ 506 DPRINTF(GDBMisc, "creating hardware breakpoint at %#x\n", evpc); 507} 508 509void 510BaseRemoteGDB::HardBreakpoint::process(ThreadContext *tc) 511{ 512 DPRINTF(GDBMisc, "handling hardware breakpoint at %#x\n", pc()); 513 514 if (tc == gdb->context) 515 gdb->trap(SIGTRAP); 516} 517 518bool 519BaseRemoteGDB::insertSoftBreak(Addr addr, size_t len) 520{ 521 if (len != sizeof(TheISA::MachInst)) 522 panic("invalid length\n"); 523 524 return insertHardBreak(addr, len); 525} 526 527bool 528BaseRemoteGDB::removeSoftBreak(Addr addr, size_t len) 529{ 530 if (len != sizeof(MachInst)) 531 panic("invalid length\n"); 532 533 return removeHardBreak(addr, len); 534} 535 536bool 537BaseRemoteGDB::insertHardBreak(Addr addr, size_t len) 538{ 539 if (len != sizeof(MachInst)) 540 panic("invalid length\n"); 541 542 DPRINTF(GDBMisc, "inserting hardware breakpoint at %#x\n", addr); 543 544 HardBreakpoint *&bkpt = hardBreakMap[addr]; 545 if (bkpt == 0) 546 bkpt = new HardBreakpoint(this, addr); 547 548 bkpt->refcount++; 549 550 return true; 551} 552 553bool 554BaseRemoteGDB::removeHardBreak(Addr addr, size_t len) 555{ 556 if (len != sizeof(MachInst)) 557 panic("invalid length\n"); 558 559 DPRINTF(GDBMisc, "removing hardware breakpoint at %#x\n", addr); 560 561 break_iter_t i = hardBreakMap.find(addr); 562 if (i == hardBreakMap.end()) 563 return false; 564 565 HardBreakpoint *hbp = (*i).second; 566 if (--hbp->refcount == 0) { 567 delete hbp; 568 hardBreakMap.erase(i); 569 } 570 571 return true; 572} 573 574void 575BaseRemoteGDB::setTempBreakpoint(Addr bkpt) 576{ 577 DPRINTF(GDBMisc, "setTempBreakpoint: addr=%#x\n", bkpt); 578 insertHardBreak(bkpt, sizeof(TheISA::MachInst)); 579} 580 581void 582BaseRemoteGDB::clearTempBreakpoint(Addr &bkpt) 583{ 584 DPRINTF(GDBMisc, "setTempBreakpoint: addr=%#x\n", bkpt); 585 removeHardBreak(bkpt, sizeof(TheISA::MachInst)); 586 bkpt = 0; 587} 588 589const char * 590BaseRemoteGDB::break_type(char c) 591{ 592 switch(c) { 593 case '0': return "software breakpoint"; 594 case '1': return "hardware breakpoint"; 595 case '2': return "write watchpoint"; 596 case '3': return "read watchpoint"; 597 case '4': return "access watchpoint"; 598 default: return "unknown breakpoint/watchpoint"; 599 } 600} 601 602// This function does all command processing for interfacing to a 603// remote gdb. Note that the error codes are ignored by gdb at 604// present, but might eventually become meaningful. (XXX) It might 605// makes sense to use POSIX errno values, because that is what the 606// gdb/remote.c functions want to return. 607bool 608BaseRemoteGDB::trap(int type) 609{ 610 uint64_t val; 611 size_t datalen, len; 612 char data[GDBPacketBufLen + 1]; 613 char buffer[gdbregs.size * 2 + 256]; 614 const char *p; 615 char command, subcmd; 616 string var; 617 bool ret; 618 619 if (!attached) 620 return false; 621 622 DPRINTF(GDBMisc, "trap: PC=%#x NPC=%#x\n", 623 context->readPC(), context->readNextPC()); 624 625 clearSingleStep(); 626 627 /* 628 * The first entry to this function is normally through 629 * a breakpoint trap in kgdb_connect(), in which case we 630 * must advance past the breakpoint because gdb will not. 631 * 632 * On the first entry here, we expect that gdb is not yet 633 * listening to us, so just enter the interaction loop. 634 * After the debugger is "active" (connected) it will be 635 * waiting for a "signaled" message from us. 636 */ 637 if (!active) 638 active = true; 639 else 640 // Tell remote host that an exception has occurred. 641 snprintf((char *)buffer, sizeof(buffer), "S%02x", type); 642 send(buffer); 643 644 // Stick frame regs into our reg cache. 645 getregs(); 646 647 for (;;) { 648 datalen = recv(data, sizeof(data)); 649 data[sizeof(data) - 1] = 0; // Sentinel 650 command = data[0]; 651 subcmd = 0; 652 p = data + 1; 653 switch (command) { 654 655 case GDBSignal: 656 // if this command came from a running gdb, answer it -- 657 // the other guy has no way of knowing if we're in or out 658 // of this loop when he issues a "remote-signal". 659 snprintf((char *)buffer, sizeof(buffer), 660 "S%02x", type); 661 send(buffer); 662 continue; 663 664 case GDBRegR: 665 if (2 * gdbregs.size > sizeof(buffer)) 666 panic("buffer too small"); 667 668 mem2hex(buffer, gdbregs.regs, gdbregs.size); 669 send(buffer); 670 continue; 671 672 case GDBRegW: 673 p = hex2mem(gdbregs.regs, p, gdbregs.size); 674 if (p == NULL || *p != '\0') 675 send("E01"); 676 else { 677 setregs(); 678 send("OK"); 679 } 680 continue; 681 682#if 0 683 case GDBSetReg: 684 val = hex2i(&p); 685 if (*p++ != '=') { 686 send("E01"); 687 continue; 688 } 689 if (val < 0 && val >= KGDB_NUMREGS) { 690 send("E01"); 691 continue; 692 } 693 694 gdbregs.regs[val] = hex2i(&p); 695 setregs(); 696 send("OK"); 697 698 continue; 699#endif 700 701 case GDBMemR: 702 val = hex2i(&p); 703 if (*p++ != ',') { 704 send("E02"); 705 continue; 706 } 707 len = hex2i(&p); 708 if (*p != '\0') { 709 send("E03"); 710 continue; 711 } 712 if (len > sizeof(buffer)) { 713 send("E04"); 714 continue; 715 } 716 if (!acc(val, len)) { 717 send("E05"); 718 continue; 719 } 720 721 if (read(val, (size_t)len, (char *)buffer)) { 722 // variable length array would be nice, but C++ doesn't 723 // officially support those... 724 char *temp = new char[2*len+1]; 725 mem2hex(temp, buffer, len); 726 send(temp); 727 delete [] temp; 728 } else { 729 send("E05"); 730 } 731 continue; 732 733 case GDBMemW: 734 val = hex2i(&p); 735 if (*p++ != ',') { 736 send("E06"); 737 continue; 738 } 739 len = hex2i(&p); 740 if (*p++ != ':') { 741 send("E07"); 742 continue; 743 } 744 if (len > datalen - (p - data)) { 745 send("E08"); 746 continue; 747 } 748 p = hex2mem(buffer, p, sizeof(buffer)); 749 if (p == NULL) { 750 send("E09"); 751 continue; 752 } 753 if (!acc(val, len)) { 754 send("E0A"); 755 continue; 756 } 757 if (write(val, (size_t)len, (char *)buffer)) 758 send("OK"); 759 else 760 send("E0B"); 761 continue; 762 763 case GDBSetThread: 764 subcmd = *p++; 765 val = hex2i(&p); 766 if (val == 0) 767 send("OK"); 768 else 769 send("E01"); 770 continue; 771 772 case GDBDetach: 773 case GDBKill: 774 active = false; 775 clearSingleStep(); 776 detach(); 777 goto out; 778 779 case GDBAsyncCont: 780 subcmd = hex2i(&p); 781 if (*p++ == ';') { 782 val = hex2i(&p); 783 context->setPC(val); 784 context->setNextPC(val + sizeof(MachInst)); 785 } 786 clearSingleStep(); 787 goto out; 788 789 case GDBCont: 790 if (p - data < datalen) { 791 val = hex2i(&p); 792 context->setPC(val); 793 context->setNextPC(val + sizeof(MachInst)); 794 } 795 clearSingleStep(); 796 goto out; 797 798 case GDBAsyncStep: 799 subcmd = hex2i(&p); 800 if (*p++ == ';') { 801 val = hex2i(&p); 802 context->setPC(val); 803 context->setNextPC(val + sizeof(MachInst)); 804 } 805 setSingleStep(); 806 goto out; 807 808 case GDBStep: 809 if (p - data < datalen) { 810 val = hex2i(&p); 811 context->setPC(val); 812 context->setNextPC(val + sizeof(MachInst)); 813 } 814 setSingleStep(); 815 goto out; 816 817 case GDBClrHwBkpt: 818 subcmd = *p++; 819 if (*p++ != ',') send("E0D"); 820 val = hex2i(&p); 821 if (*p++ != ',') send("E0D"); 822 len = hex2i(&p); 823 824 DPRINTF(GDBMisc, "clear %s, addr=%#x, len=%d\n", 825 break_type(subcmd), val, len); 826 827 ret = false; 828 829 switch (subcmd) { 830 case '0': // software breakpoint 831 ret = removeSoftBreak(val, len); 832 break; 833 834 case '1': // hardware breakpoint 835 ret = removeHardBreak(val, len); 836 break; 837 838 case '2': // write watchpoint 839 case '3': // read watchpoint 840 case '4': // access watchpoint 841 default: // unknown 842 send(""); 843 break; 844 } 845 846 send(ret ? "OK" : "E0C"); 847 continue; 848 849 case GDBSetHwBkpt: 850 subcmd = *p++; 851 if (*p++ != ',') send("E0D"); 852 val = hex2i(&p); 853 if (*p++ != ',') send("E0D"); 854 len = hex2i(&p); 855 856 DPRINTF(GDBMisc, "set %s, addr=%#x, len=%d\n", 857 break_type(subcmd), val, len); 858 859 ret = false; 860 861 switch (subcmd) { 862 case '0': // software breakpoint 863 ret = insertSoftBreak(val, len); 864 break; 865 866 case '1': // hardware breakpoint 867 ret = insertHardBreak(val, len); 868 break; 869 870 case '2': // write watchpoint 871 case '3': // read watchpoint 872 case '4': // access watchpoint 873 default: // unknown 874 send(""); 875 break; 876 } 877 878 send(ret ? "OK" : "E0C"); 879 continue; 880 881 case GDBQueryVar: 882 var = string(p, datalen - 1); 883 if (var == "C") 884 send("QC0"); 885 else 886 send(""); 887 continue; 888 889 case GDBSetBaud: 890 case GDBSetBreak: 891 case GDBDebug: 892 case GDBCycleStep: 893 case GDBSigCycleStep: 894 case GDBReadReg: 895 case GDBSetVar: 896 case GDBReset: 897 case GDBThreadAlive: 898 case GDBTargetExit: 899 case GDBBinaryDload: 900 // Unsupported command 901 DPRINTF(GDBMisc, "Unsupported command: %s\n", 902 gdb_command(command)); 903 DDUMP(GDBMisc, (uint8_t *)data, datalen); 904 send(""); 905 continue; 906 907 default: 908 // Unknown command. 909 DPRINTF(GDBMisc, "Unknown command: %c(%#x)\n", 910 command, command); 911 send(""); 912 continue; 913 914 915 } 916 } 917 918 out: 919 return true; 920} 921 922// Convert a hex digit into an integer. 923// This returns -1 if the argument passed is no valid hex digit. 924int 925BaseRemoteGDB::digit2i(char c) 926{ 927 if (c >= '0' && c <= '9') 928 return (c - '0'); 929 else if (c >= 'a' && c <= 'f') 930 return (c - 'a' + 10); 931 else if (c >= 'A' && c <= 'F') 932 933 return (c - 'A' + 10); 934 else 935 return (-1); 936} 937 938// Convert the low 4 bits of an integer into an hex digit. 939char 940BaseRemoteGDB::i2digit(int n) 941{ 942 return ("0123456789abcdef"[n & 0x0f]); 943} 944 945// Convert a byte array into an hex string. 946void 947BaseRemoteGDB::mem2hex(void *vdst, const void *vsrc, int len) 948{ 949 char *dst = (char *)vdst; 950 const char *src = (const char *)vsrc; 951 952 while (len--) { 953 *dst++ = i2digit(*src >> 4); 954 *dst++ = i2digit(*src++); 955 } 956 *dst = '\0'; 957} 958 959// Convert an hex string into a byte array. 960// This returns a pointer to the character following the last valid 961// hex digit. If the string ends in the middle of a byte, NULL is 962// returned. 963const char * 964BaseRemoteGDB::hex2mem(void *vdst, const char *src, int maxlen) 965{ 966 char *dst = (char *)vdst; 967 int msb, lsb; 968 969 while (*src && maxlen--) { 970 msb = digit2i(*src++); 971 if (msb < 0) 972 return (src - 1); 973 lsb = digit2i(*src++); 974 if (lsb < 0) 975 return (NULL); 976 *dst++ = (msb << 4) | lsb; 977 } 978 return (src); 979} 980 981// Convert an hex string into an integer. 982// This returns a pointer to the character following the last valid 983// hex digit. 984Addr 985BaseRemoteGDB::hex2i(const char **srcp) 986{ 987 const char *src = *srcp; 988 Addr r = 0; 989 int nibble; 990 991 while ((nibble = digit2i(*src)) >= 0) { 992 r *= 16; 993 r += nibble; 994 src++; 995 } 996 *srcp = src; 997 return (r); 998} 999 1000