remote_gdb.cc revision 8706
1/* 2 * Copyright (c) 2002-2005 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Nathan Binkert 29 */ 30 31/* 32 * Copyright (c) 1990, 1993 The Regents of the University of California 33 * All rights reserved 34 * 35 * This software was developed by the Computer Systems Engineering group 36 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 37 * contributed to Berkeley. 38 * 39 * All advertising materials mentioning features or use of this software 40 * must display the following acknowledgement: 41 * This product includes software developed by the University of 42 * California, Lawrence Berkeley Laboratories. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 1. Redistributions of source code must retain the above copyright 48 * notice, this list of conditions and the following disclaimer. 49 * 2. Redistributions in binary form must reproduce the above copyright 50 * notice, this list of conditions and the following disclaimer in the 51 * documentation and/or other materials provided with the distribution. 52 * 3. All advertising materials mentioning features or use of this software 53 * must display the following acknowledgement: 54 * This product includes software developed by the University of 55 * California, Berkeley and its contributors. 56 * 4. Neither the name of the University nor the names of its contributors 57 * may be used to endorse or promote products derived from this software 58 * without specific prior written permission. 59 * 60 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 61 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 62 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 63 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 64 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 65 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 66 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 67 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 68 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 69 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 70 * SUCH DAMAGE. 71 * 72 * @(#)kgdb_stub.c 8.4 (Berkeley) 1/12/94 73 */ 74 75/*- 76 * Copyright (c) 2001 The NetBSD Foundation, Inc. 77 * All rights reserved. 78 * 79 * This code is derived from software contributed to The NetBSD Foundation 80 * by Jason R. Thorpe. 81 * 82 * Redistribution and use in source and binary forms, with or without 83 * modification, are permitted provided that the following conditions 84 * are met: 85 * 1. Redistributions of source code must retain the above copyright 86 * notice, this list of conditions and the following disclaimer. 87 * 2. Redistributions in binary form must reproduce the above copyright 88 * notice, this list of conditions and the following disclaimer in the 89 * documentation and/or other materials provided with the distribution. 90 * 3. All advertising materials mentioning features or use of this software 91 * must display the following acknowledgement: 92 * This product includes software developed by the NetBSD 93 * Foundation, Inc. and its contributors. 94 * 4. Neither the name of The NetBSD Foundation nor the names of its 95 * contributors may be used to endorse or promote products derived 96 * from this software without specific prior written permission. 97 * 98 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 99 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 100 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 101 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 102 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 103 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 104 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 105 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 106 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 107 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 108 * POSSIBILITY OF SUCH DAMAGE. 109 */ 110 111/* 112 * $NetBSD: kgdb_stub.c,v 1.8 2001/07/07 22:58:00 wdk Exp $ 113 * 114 * Taken from NetBSD 115 * 116 * "Stub" to allow remote cpu to debug over a serial line using gdb. 117 */ 118 119#include <sys/signal.h> 120#include <unistd.h> 121 122#include <cstdio> 123#include <string> 124 125#include "config/full_system.hh" 126 127#if FULL_SYSTEM 128#include "arch/vtophys.hh" 129#include "mem/fs_translating_port_proxy.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/static_inst.hh" 138#include "cpu/thread_context.hh" 139#include "debug/GDBAll.hh" 140#include "mem/port.hh" 141#include "mem/se_translating_port_proxy.hh" 142#include "sim/system.hh" 143 144using namespace std; 145using namespace Debug; 146using namespace TheISA; 147 148#ifndef NDEBUG 149vector<BaseRemoteGDB *> debuggers; 150 151void 152debugger() 153{ 154 static int current_debugger = -1; 155 if (current_debugger >= 0 && current_debugger < (int)debuggers.size()) { 156 BaseRemoteGDB *gdb = debuggers[current_debugger]; 157 if (!gdb->isattached()) 158 gdb->listener->accept(); 159 if (gdb->isattached()) 160 gdb->trap(SIGILL); 161 } 162} 163#endif 164 165/////////////////////////////////////////////////////////// 166// 167// 168// 169 170GDBListener::Event::Event(GDBListener *l, int fd, int e) 171 : PollEvent(fd, e), listener(l) 172{} 173 174void 175GDBListener::Event::process(int revent) 176{ 177 listener->accept(); 178} 179 180GDBListener::GDBListener(BaseRemoteGDB *g, int p) 181 : event(NULL), gdb(g), port(p) 182{ 183 assert(!gdb->listener); 184 gdb->listener = this; 185} 186 187GDBListener::~GDBListener() 188{ 189 if (event) 190 delete event; 191} 192 193string 194GDBListener::name() 195{ 196 return gdb->name() + ".listener"; 197} 198 199void 200GDBListener::listen() 201{ 202 if (ListenSocket::allDisabled()) { 203 warn_once("Sockets disabled, not accepting gdb connections"); 204 return; 205 } 206 207 while (!listener.listen(port, true)) { 208 DPRINTF(GDBMisc, "Can't bind port %d\n", port); 209 port++; 210 } 211 212 event = new Event(this, listener.getfd(), POLLIN); 213 pollQueue.schedule(event); 214 215#ifndef NDEBUG 216 gdb->number = debuggers.size(); 217 debuggers.push_back(gdb); 218#endif 219 220#ifndef NDEBUG 221 ccprintf(cerr, "%d: %s: listening for remote gdb #%d on port %d\n", 222 curTick(), name(), gdb->number, port); 223#else 224 ccprintf(cerr, "%d: %s: listening for remote gdb on port %d\n", 225 curTick(), name(), port); 226#endif 227} 228 229void 230GDBListener::accept() 231{ 232 if (!listener.islistening()) 233 panic("GDBListener::accept(): cannot accept if we're not listening!"); 234 235 int sfd = listener.accept(true); 236 237 if (sfd != -1) { 238 if (gdb->isattached()) 239 close(sfd); 240 else 241 gdb->attach(sfd); 242 } 243} 244 245BaseRemoteGDB::Event::Event(BaseRemoteGDB *g, int fd, int e) 246 : PollEvent(fd, e), gdb(g) 247{} 248 249void 250BaseRemoteGDB::Event::process(int revent) 251{ 252 if (revent & POLLIN) 253 gdb->trap(SIGILL); 254 else if (revent & POLLNVAL) 255 gdb->detach(); 256} 257 258BaseRemoteGDB::BaseRemoteGDB(System *_system, ThreadContext *c, size_t cacheSize) 259 : event(NULL), listener(NULL), number(-1), fd(-1), 260 active(false), attached(false), 261 system(_system), pmem(_system->physmem), context(c), 262 gdbregs(cacheSize) 263{ 264 memset(gdbregs.regs, 0, gdbregs.bytes()); 265} 266 267BaseRemoteGDB::~BaseRemoteGDB() 268{ 269 if (event) 270 delete event; 271} 272 273string 274BaseRemoteGDB::name() 275{ 276 return system->name() + ".remote_gdb"; 277} 278 279bool 280BaseRemoteGDB::isattached() 281{ return attached; } 282 283void 284BaseRemoteGDB::attach(int f) 285{ 286 fd = f; 287 288 event = new Event(this, fd, POLLIN); 289 pollQueue.schedule(event); 290 291 attached = true; 292 DPRINTFN("remote gdb attached\n"); 293} 294 295void 296BaseRemoteGDB::detach() 297{ 298 attached = false; 299 close(fd); 300 fd = -1; 301 302 pollQueue.remove(event); 303 DPRINTFN("remote gdb detached\n"); 304} 305 306const char * 307BaseRemoteGDB::gdb_command(char cmd) 308{ 309 switch (cmd) { 310 case GDBSignal: return "KGDB_SIGNAL"; 311 case GDBSetBaud: return "KGDB_SET_BAUD"; 312 case GDBSetBreak: return "KGDB_SET_BREAK"; 313 case GDBCont: return "KGDB_CONT"; 314 case GDBAsyncCont: return "KGDB_ASYNC_CONT"; 315 case GDBDebug: return "KGDB_DEBUG"; 316 case GDBDetach: return "KGDB_DETACH"; 317 case GDBRegR: return "KGDB_REG_R"; 318 case GDBRegW: return "KGDB_REG_W"; 319 case GDBSetThread: return "KGDB_SET_THREAD"; 320 case GDBCycleStep: return "KGDB_CYCLE_STEP"; 321 case GDBSigCycleStep: return "KGDB_SIG_CYCLE_STEP"; 322 case GDBKill: return "KGDB_KILL"; 323 case GDBMemW: return "KGDB_MEM_W"; 324 case GDBMemR: return "KGDB_MEM_R"; 325 case GDBSetReg: return "KGDB_SET_REG"; 326 case GDBReadReg: return "KGDB_READ_REG"; 327 case GDBQueryVar: return "KGDB_QUERY_VAR"; 328 case GDBSetVar: return "KGDB_SET_VAR"; 329 case GDBReset: return "KGDB_RESET"; 330 case GDBStep: return "KGDB_STEP"; 331 case GDBAsyncStep: return "KGDB_ASYNC_STEP"; 332 case GDBThreadAlive: return "KGDB_THREAD_ALIVE"; 333 case GDBTargetExit: return "KGDB_TARGET_EXIT"; 334 case GDBBinaryDload: return "KGDB_BINARY_DLOAD"; 335 case GDBClrHwBkpt: return "KGDB_CLR_HW_BKPT"; 336 case GDBSetHwBkpt: return "KGDB_SET_HW_BKPT"; 337 case GDBStart: return "KGDB_START"; 338 case GDBEnd: return "KGDB_END"; 339 case GDBGoodP: return "KGDB_GOODP"; 340 case GDBBadP: return "KGDB_BADP"; 341 default: return "KGDB_UNKNOWN"; 342 } 343} 344 345///////////////////////// 346// 347// 348 349uint8_t 350BaseRemoteGDB::getbyte() 351{ 352 uint8_t b; 353 if (::read(fd, &b, 1) != 1) 354 warn("could not read byte from debugger"); 355 return b; 356} 357 358void 359BaseRemoteGDB::putbyte(uint8_t b) 360{ 361 if (::write(fd, &b, 1) != 1) 362 warn("could not write byte to debugger"); 363} 364 365// Send a packet to gdb 366void 367BaseRemoteGDB::send(const char *bp) 368{ 369 const char *p; 370 uint8_t csum, c; 371 372 DPRINTF(GDBSend, "send: %s\n", bp); 373 374 do { 375 p = bp; 376 //Start sending a packet 377 putbyte(GDBStart); 378 //Send the contents, and also keep a check sum. 379 for (csum = 0; (c = *p); p++) { 380 putbyte(c); 381 csum += c; 382 } 383 //Send the ending character. 384 putbyte(GDBEnd); 385 //Sent the checksum. 386 putbyte(i2digit(csum >> 4)); 387 putbyte(i2digit(csum)); 388 //Try transmitting over and over again until the other end doesn't send an 389 //error back. 390 } while ((c = getbyte() & 0x7f) == GDBBadP); 391} 392 393// Receive a packet from gdb 394int 395BaseRemoteGDB::recv(char *bp, int maxlen) 396{ 397 char *p; 398 int c, csum; 399 int len; 400 401 do { 402 p = bp; 403 csum = len = 0; 404 //Find the beginning of a packet 405 while ((c = getbyte()) != GDBStart) 406 ; 407 408 //Read until you find the end of the data in the packet, and keep 409 //track of the check sum. 410 while ((c = getbyte()) != GDBEnd && len < maxlen) { 411 c &= 0x7f; 412 csum += c; 413 *p++ = c; 414 len++; 415 } 416 417 //Mask the check sum, and terminate the command string. 418 csum &= 0xff; 419 *p = '\0'; 420 421 //If the command was too long, report an error. 422 if (len >= maxlen) { 423 putbyte(GDBBadP); 424 continue; 425 } 426 427 //Bring in the checksum. If the check sum matches, csum will be 0. 428 csum -= digit2i(getbyte()) * 16; 429 csum -= digit2i(getbyte()); 430 431 //If the check sum was correct 432 if (csum == 0) { 433 //Report that the packet was received correctly 434 putbyte(GDBGoodP); 435 // Sequence present? 436 if (bp[2] == ':') { 437 putbyte(bp[0]); 438 putbyte(bp[1]); 439 len -= 3; 440 memcpy(bp, bp+3, len); 441 } 442 break; 443 } 444 //Otherwise, report that there was a mistake. 445 putbyte(GDBBadP); 446 } while (1); 447 448 DPRINTF(GDBRecv, "recv: %s: %s\n", gdb_command(*bp), bp); 449 450 return (len); 451} 452 453// Read bytes from kernel address space for debugger. 454bool 455BaseRemoteGDB::read(Addr vaddr, size_t size, char *data) 456{ 457 static Addr lastaddr = 0; 458 static size_t lastsize = 0; 459 460 if (vaddr < 10) { 461 DPRINTF(GDBRead, "read: reading memory location zero!\n"); 462 vaddr = lastaddr + lastsize; 463 } 464 465 DPRINTF(GDBRead, "read: addr=%#x, size=%d", vaddr, size); 466 467#if FULL_SYSTEM 468 FSTranslatingPortProxy *port = context->getVirtProxy(); 469#else 470 SETranslatingPortProxy *port = context->getMemProxy(); 471#endif 472 port->readBlob(vaddr, (uint8_t*)data, size); 473 474#if TRACING_ON 475 if (DTRACE(GDBRead)) { 476 if (DTRACE(GDBExtra)) { 477 char buf[1024]; 478 mem2hex(buf, data, size); 479 DPRINTFNR(": %s\n", buf); 480 } else 481 DPRINTFNR("\n"); 482 } 483#endif 484 485 return true; 486} 487 488// Write bytes to kernel address space for debugger. 489bool 490BaseRemoteGDB::write(Addr vaddr, size_t size, const char *data) 491{ 492 static Addr lastaddr = 0; 493 static size_t lastsize = 0; 494 495 if (vaddr < 10) { 496 DPRINTF(GDBWrite, "write: writing memory location zero!\n"); 497 vaddr = lastaddr + lastsize; 498 } 499 500 if (DTRACE(GDBWrite)) { 501 DPRINTFN("write: addr=%#x, size=%d", vaddr, size); 502 if (DTRACE(GDBExtra)) { 503 char buf[1024]; 504 mem2hex(buf, data, size); 505 DPRINTFNR(": %s\n", buf); 506 } else 507 DPRINTFNR("\n"); 508 } 509#if FULL_SYSTEM 510 FSTranslatingPortProxy *port = context->getVirtProxy(); 511#else 512 SETranslatingPortProxy *port = context->getMemProxy(); 513#endif 514 port->writeBlob(vaddr, (uint8_t*)data, size); 515#if !FULL_SYSTEM 516 delete port; 517#endif 518 519 return true; 520} 521 522PCEventQueue *BaseRemoteGDB::getPcEventQueue() 523{ 524 return &system->pcEventQueue; 525} 526 527BaseRemoteGDB::HardBreakpoint::HardBreakpoint(BaseRemoteGDB *_gdb, Addr pc) 528 : PCEvent(_gdb->getPcEventQueue(), "HardBreakpoint Event", pc), 529 gdb(_gdb), refcount(0) 530{ 531 DPRINTF(GDBMisc, "creating hardware breakpoint at %#x\n", evpc); 532} 533 534void 535BaseRemoteGDB::HardBreakpoint::process(ThreadContext *tc) 536{ 537 DPRINTF(GDBMisc, "handling hardware breakpoint at %#x\n", pc()); 538 539 if (tc == gdb->context) 540 gdb->trap(SIGTRAP); 541} 542 543bool 544BaseRemoteGDB::insertSoftBreak(Addr addr, size_t len) 545{ 546 if (len != sizeof(TheISA::MachInst)) 547 panic("invalid length\n"); 548 549 return insertHardBreak(addr, len); 550} 551 552bool 553BaseRemoteGDB::removeSoftBreak(Addr addr, size_t len) 554{ 555 if (len != sizeof(MachInst)) 556 panic("invalid length\n"); 557 558 return removeHardBreak(addr, len); 559} 560 561bool 562BaseRemoteGDB::insertHardBreak(Addr addr, size_t len) 563{ 564 if (len != sizeof(MachInst)) 565 panic("invalid length\n"); 566 567 DPRINTF(GDBMisc, "inserting hardware breakpoint at %#x\n", addr); 568 569 HardBreakpoint *&bkpt = hardBreakMap[addr]; 570 if (bkpt == 0) 571 bkpt = new HardBreakpoint(this, addr); 572 573 bkpt->refcount++; 574 575 return true; 576} 577 578bool 579BaseRemoteGDB::removeHardBreak(Addr addr, size_t len) 580{ 581 if (len != sizeof(MachInst)) 582 panic("invalid length\n"); 583 584 DPRINTF(GDBMisc, "removing hardware breakpoint at %#x\n", addr); 585 586 break_iter_t i = hardBreakMap.find(addr); 587 if (i == hardBreakMap.end()) 588 return false; 589 590 HardBreakpoint *hbp = (*i).second; 591 if (--hbp->refcount == 0) { 592 delete hbp; 593 hardBreakMap.erase(i); 594 } 595 596 return true; 597} 598 599void 600BaseRemoteGDB::setTempBreakpoint(Addr bkpt) 601{ 602 DPRINTF(GDBMisc, "setTempBreakpoint: addr=%#x\n", bkpt); 603 insertHardBreak(bkpt, sizeof(TheISA::MachInst)); 604} 605 606void 607BaseRemoteGDB::clearTempBreakpoint(Addr &bkpt) 608{ 609 DPRINTF(GDBMisc, "setTempBreakpoint: addr=%#x\n", bkpt); 610 removeHardBreak(bkpt, sizeof(TheISA::MachInst)); 611 bkpt = 0; 612} 613 614const char * 615BaseRemoteGDB::break_type(char c) 616{ 617 switch(c) { 618 case '0': return "software breakpoint"; 619 case '1': return "hardware breakpoint"; 620 case '2': return "write watchpoint"; 621 case '3': return "read watchpoint"; 622 case '4': return "access watchpoint"; 623 default: return "unknown breakpoint/watchpoint"; 624 } 625} 626 627// This function does all command processing for interfacing to a 628// remote gdb. Note that the error codes are ignored by gdb at 629// present, but might eventually become meaningful. (XXX) It might 630// makes sense to use POSIX errno values, because that is what the 631// gdb/remote.c functions want to return. 632bool 633BaseRemoteGDB::trap(int type) 634{ 635 uint64_t val; 636 size_t datalen, len; 637 char data[GDBPacketBufLen + 1]; 638 char *buffer; 639 size_t bufferSize; 640 const char *p; 641 char command, subcmd; 642 string var; 643 bool ret; 644 645 if (!attached) 646 return false; 647 648 bufferSize = gdbregs.bytes() * 2 + 256; 649 buffer = (char*)malloc(bufferSize); 650 651 DPRINTF(GDBMisc, "trap: PC=%s\n", context->pcState()); 652 653 clearSingleStep(); 654 655 /* 656 * The first entry to this function is normally through 657 * a breakpoint trap in kgdb_connect(), in which case we 658 * must advance past the breakpoint because gdb will not. 659 * 660 * On the first entry here, we expect that gdb is not yet 661 * listening to us, so just enter the interaction loop. 662 * After the debugger is "active" (connected) it will be 663 * waiting for a "signaled" message from us. 664 */ 665 if (!active) 666 active = true; 667 else 668 // Tell remote host that an exception has occurred. 669 snprintf((char *)buffer, bufferSize, "S%02x", type); 670 send(buffer); 671 672 // Stick frame regs into our reg cache. 673 getregs(); 674 675 for (;;) { 676 datalen = recv(data, sizeof(data)); 677 data[sizeof(data) - 1] = 0; // Sentinel 678 command = data[0]; 679 subcmd = 0; 680 p = data + 1; 681 switch (command) { 682 683 case GDBSignal: 684 // if this command came from a running gdb, answer it -- 685 // the other guy has no way of knowing if we're in or out 686 // of this loop when he issues a "remote-signal". 687 snprintf((char *)buffer, bufferSize, 688 "S%02x", type); 689 send(buffer); 690 continue; 691 692 case GDBRegR: 693 if (2 * gdbregs.bytes() > bufferSize) 694 panic("buffer too small"); 695 696 mem2hex(buffer, gdbregs.regs, gdbregs.bytes()); 697 send(buffer); 698 continue; 699 700 case GDBRegW: 701 p = hex2mem(gdbregs.regs, p, gdbregs.bytes()); 702 if (p == NULL || *p != '\0') 703 send("E01"); 704 else { 705 setregs(); 706 send("OK"); 707 } 708 continue; 709 710#if 0 711 case GDBSetReg: 712 val = hex2i(&p); 713 if (*p++ != '=') { 714 send("E01"); 715 continue; 716 } 717 if (val < 0 && val >= KGDB_NUMREGS) { 718 send("E01"); 719 continue; 720 } 721 722 gdbregs.regs[val] = hex2i(&p); 723 setregs(); 724 send("OK"); 725 726 continue; 727#endif 728 729 case GDBMemR: 730 val = hex2i(&p); 731 if (*p++ != ',') { 732 send("E02"); 733 continue; 734 } 735 len = hex2i(&p); 736 if (*p != '\0') { 737 send("E03"); 738 continue; 739 } 740 if (len > bufferSize) { 741 send("E04"); 742 continue; 743 } 744 if (!acc(val, len)) { 745 send("E05"); 746 continue; 747 } 748 749 if (read(val, (size_t)len, (char *)buffer)) { 750 // variable length array would be nice, but C++ doesn't 751 // officially support those... 752 char *temp = new char[2*len+1]; 753 mem2hex(temp, buffer, len); 754 send(temp); 755 delete [] temp; 756 } else { 757 send("E05"); 758 } 759 continue; 760 761 case GDBMemW: 762 val = hex2i(&p); 763 if (*p++ != ',') { 764 send("E06"); 765 continue; 766 } 767 len = hex2i(&p); 768 if (*p++ != ':') { 769 send("E07"); 770 continue; 771 } 772 if (len > datalen - (p - data)) { 773 send("E08"); 774 continue; 775 } 776 p = hex2mem(buffer, p, bufferSize); 777 if (p == NULL) { 778 send("E09"); 779 continue; 780 } 781 if (!acc(val, len)) { 782 send("E0A"); 783 continue; 784 } 785 if (write(val, (size_t)len, (char *)buffer)) 786 send("OK"); 787 else 788 send("E0B"); 789 continue; 790 791 case GDBSetThread: 792 subcmd = *p++; 793 val = hex2i(&p); 794 if (val == 0) 795 send("OK"); 796 else 797 send("E01"); 798 continue; 799 800 case GDBDetach: 801 case GDBKill: 802 active = false; 803 clearSingleStep(); 804 detach(); 805 goto out; 806 807 case GDBAsyncCont: 808 subcmd = hex2i(&p); 809 if (*p++ == ';') { 810 val = hex2i(&p); 811 context->pcState(val); 812 } 813 clearSingleStep(); 814 goto out; 815 816 case GDBCont: 817 if (p - data < (ptrdiff_t)datalen) { 818 val = hex2i(&p); 819 context->pcState(val); 820 } 821 clearSingleStep(); 822 goto out; 823 824 case GDBAsyncStep: 825 subcmd = hex2i(&p); 826 if (*p++ == ';') { 827 val = hex2i(&p); 828 context->pcState(val); 829 } 830 setSingleStep(); 831 goto out; 832 833 case GDBStep: 834 if (p - data < (ptrdiff_t)datalen) { 835 val = hex2i(&p); 836 context->pcState(val); 837 } 838 setSingleStep(); 839 goto out; 840 841 case GDBClrHwBkpt: 842 subcmd = *p++; 843 if (*p++ != ',') send("E0D"); 844 val = hex2i(&p); 845 if (*p++ != ',') send("E0D"); 846 len = hex2i(&p); 847 848 DPRINTF(GDBMisc, "clear %s, addr=%#x, len=%d\n", 849 break_type(subcmd), val, len); 850 851 ret = false; 852 853 switch (subcmd) { 854 case '0': // software breakpoint 855 ret = removeSoftBreak(val, len); 856 break; 857 858 case '1': // hardware breakpoint 859 ret = removeHardBreak(val, len); 860 break; 861 862 case '2': // write watchpoint 863 case '3': // read watchpoint 864 case '4': // access watchpoint 865 default: // unknown 866 send(""); 867 break; 868 } 869 870 send(ret ? "OK" : "E0C"); 871 continue; 872 873 case GDBSetHwBkpt: 874 subcmd = *p++; 875 if (*p++ != ',') send("E0D"); 876 val = hex2i(&p); 877 if (*p++ != ',') send("E0D"); 878 len = hex2i(&p); 879 880 DPRINTF(GDBMisc, "set %s, addr=%#x, len=%d\n", 881 break_type(subcmd), val, len); 882 883 ret = false; 884 885 switch (subcmd) { 886 case '0': // software breakpoint 887 ret = insertSoftBreak(val, len); 888 break; 889 890 case '1': // hardware breakpoint 891 ret = insertHardBreak(val, len); 892 break; 893 894 case '2': // write watchpoint 895 case '3': // read watchpoint 896 case '4': // access watchpoint 897 default: // unknown 898 send(""); 899 break; 900 } 901 902 send(ret ? "OK" : "E0C"); 903 continue; 904 905 case GDBQueryVar: 906 var = string(p, datalen - 1); 907 if (var == "C") 908 send("QC0"); 909 else 910 send(""); 911 continue; 912 913 case GDBSetBaud: 914 case GDBSetBreak: 915 case GDBDebug: 916 case GDBCycleStep: 917 case GDBSigCycleStep: 918 case GDBReadReg: 919 case GDBSetVar: 920 case GDBReset: 921 case GDBThreadAlive: 922 case GDBTargetExit: 923 case GDBBinaryDload: 924 // Unsupported command 925 DPRINTF(GDBMisc, "Unsupported command: %s\n", 926 gdb_command(command)); 927 DDUMP(GDBMisc, (uint8_t *)data, datalen); 928 send(""); 929 continue; 930 931 default: 932 // Unknown command. 933 DPRINTF(GDBMisc, "Unknown command: %c(%#x)\n", 934 command, command); 935 send(""); 936 continue; 937 938 939 } 940 } 941 942 out: 943 free(buffer); 944 return true; 945} 946 947// Convert a hex digit into an integer. 948// This returns -1 if the argument passed is no valid hex digit. 949int 950BaseRemoteGDB::digit2i(char c) 951{ 952 if (c >= '0' && c <= '9') 953 return (c - '0'); 954 else if (c >= 'a' && c <= 'f') 955 return (c - 'a' + 10); 956 else if (c >= 'A' && c <= 'F') 957 958 return (c - 'A' + 10); 959 else 960 return (-1); 961} 962 963// Convert the low 4 bits of an integer into an hex digit. 964char 965BaseRemoteGDB::i2digit(int n) 966{ 967 return ("0123456789abcdef"[n & 0x0f]); 968} 969 970// Convert a byte array into an hex string. 971void 972BaseRemoteGDB::mem2hex(void *vdst, const void *vsrc, int len) 973{ 974 char *dst = (char *)vdst; 975 const char *src = (const char *)vsrc; 976 977 while (len--) { 978 *dst++ = i2digit(*src >> 4); 979 *dst++ = i2digit(*src++); 980 } 981 *dst = '\0'; 982} 983 984// Convert an hex string into a byte array. 985// This returns a pointer to the character following the last valid 986// hex digit. If the string ends in the middle of a byte, NULL is 987// returned. 988const char * 989BaseRemoteGDB::hex2mem(void *vdst, const char *src, int maxlen) 990{ 991 char *dst = (char *)vdst; 992 int msb, lsb; 993 994 while (*src && maxlen--) { 995 msb = digit2i(*src++); 996 if (msb < 0) 997 return (src - 1); 998 lsb = digit2i(*src++); 999 if (lsb < 0) 1000 return (NULL); 1001 *dst++ = (msb << 4) | lsb; 1002 } 1003 return (src); 1004} 1005 1006// Convert an hex string into an integer. 1007// This returns a pointer to the character following the last valid 1008// hex digit. 1009Addr 1010BaseRemoteGDB::hex2i(const char **srcp) 1011{ 1012 const char *src = *srcp; 1013 Addr r = 0; 1014 int nibble; 1015 1016 while ((nibble = digit2i(*src)) >= 0) { 1017 r *= 16; 1018 r += nibble; 1019 src++; 1020 } 1021 *srcp = src; 1022 return (r); 1023} 1024 1025