1 //===-- GDBRemoteCommunication.cpp ------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 11 #include "GDBRemoteCommunication.h" 12 13 // C Includes 14 // C++ Includes 15 // Other libraries and framework includes 16 #include "lldb/Interpreter/Args.h" 17 #include "lldb/Core/ConnectionFileDescriptor.h" 18 #include "lldb/Core/Log.h" 19 #include "lldb/Core/State.h" 20 #include "lldb/Core/StreamString.h" 21 #include "lldb/Host/TimeValue.h" 22 23 // Project includes 24 #include "Utility/StringExtractorGDBRemote.h" 25 #include "ProcessGDBRemote.h" 26 #include "ProcessGDBRemoteLog.h" 27 28 using namespace lldb; 29 using namespace lldb_private; 30 31 //---------------------------------------------------------------------- 32 // GDBRemoteCommunication constructor 33 //---------------------------------------------------------------------- 34 GDBRemoteCommunication::GDBRemoteCommunication() : 35 Communication("gdb-remote.packets"), 36 m_send_acks (true), 37 m_rx_packet_listener ("gdbremote.rx_packet"), 38 m_sequence_mutex (Mutex::eMutexTypeRecursive), 39 m_is_running (false), 40 m_async_mutex (Mutex::eMutexTypeRecursive), 41 m_async_packet_predicate (false), 42 m_async_packet (), 43 m_async_response (), 44 m_async_timeout (UINT32_MAX), 45 m_async_signal (-1), 46 m_arch(), 47 m_os(), 48 m_vendor(), 49 m_byte_order(eByteOrderHost), 50 m_pointer_byte_size(0) 51 { 52 m_rx_packet_listener.StartListeningForEvents(this, 53 Communication::eBroadcastBitPacketAvailable | 54 Communication::eBroadcastBitReadThreadDidExit); 55 } 56 57 //---------------------------------------------------------------------- 58 // Destructor 59 //---------------------------------------------------------------------- 60 GDBRemoteCommunication::~GDBRemoteCommunication() 61 { 62 m_rx_packet_listener.StopListeningForEvents(this, 63 Communication::eBroadcastBitPacketAvailable | 64 Communication::eBroadcastBitReadThreadDidExit); 65 if (IsConnected()) 66 { 67 StopReadThread(); 68 Disconnect(); 69 } 70 } 71 72 73 char 74 GDBRemoteCommunication::CalculcateChecksum (const char *payload, size_t payload_length) 75 { 76 int checksum = 0; 77 78 // We only need to compute the checksum if we are sending acks 79 if (m_send_acks) 80 { 81 for (size_t i = 0; i < payload_length; ++i) 82 checksum += payload[i]; 83 } 84 return checksum & 255; 85 } 86 87 size_t 88 GDBRemoteCommunication::SendAck (char ack_char) 89 { 90 Mutex::Locker locker(m_sequence_mutex); 91 ProcessGDBRemoteLog::LogIf (GDBR_LOG_PACKETS, "send packet: %c", ack_char); 92 ConnectionStatus status = eConnectionStatusSuccess; 93 return Write (&ack_char, 1, status, NULL) == 1; 94 } 95 96 size_t 97 GDBRemoteCommunication::SendPacketAndWaitForResponse 98 ( 99 const char *payload, 100 StringExtractorGDBRemote &response, 101 uint32_t timeout_seconds, 102 bool send_async 103 ) 104 { 105 return SendPacketAndWaitForResponse (payload, 106 ::strlen (payload), 107 response, 108 timeout_seconds, 109 send_async); 110 } 111 112 size_t 113 GDBRemoteCommunication::SendPacketAndWaitForResponse 114 ( 115 const char *payload, 116 size_t payload_length, 117 StringExtractorGDBRemote &response, 118 uint32_t timeout_seconds, 119 bool send_async 120 ) 121 { 122 Mutex::Locker locker; 123 TimeValue timeout_time; 124 timeout_time = TimeValue::Now(); 125 timeout_time.OffsetWithSeconds (timeout_seconds); 126 127 if (locker.TryLock (m_sequence_mutex.GetMutex())) 128 { 129 if (SendPacketNoLock (payload, strlen(payload))) 130 return WaitForPacketNoLock (response, &timeout_time); 131 } 132 else 133 { 134 if (send_async) 135 { 136 Mutex::Locker async_locker (m_async_mutex); 137 m_async_packet.assign(payload, payload_length); 138 m_async_timeout = timeout_seconds; 139 m_async_packet_predicate.SetValue (true, eBroadcastNever); 140 141 bool timed_out = false; 142 if (SendInterrupt(1, &timed_out)) 143 { 144 if (m_async_packet_predicate.WaitForValueEqualTo (false, &timeout_time, &timed_out)) 145 { 146 response = m_async_response; 147 return response.GetStringRef().size(); 148 } 149 } 150 // if (timed_out) 151 // m_error.SetErrorString("Timeout."); 152 // else 153 // m_error.SetErrorString("Unknown error."); 154 } 155 else 156 { 157 // m_error.SetErrorString("Sequence mutex is locked."); 158 } 159 } 160 return 0; 161 } 162 163 //template<typename _Tp> 164 //class ScopedValueChanger 165 //{ 166 //public: 167 // // Take a value reference and the value to assing it to when this class 168 // // instance goes out of scope. 169 // ScopedValueChanger (_Tp &value_ref, _Tp value) : 170 // m_value_ref (value_ref), 171 // m_value (value) 172 // { 173 // } 174 // 175 // // This object is going out of scope, change the value pointed to by 176 // // m_value_ref to the value we got during construction which was stored in 177 // // m_value; 178 // ~ScopedValueChanger () 179 // { 180 // m_value_ref = m_value; 181 // } 182 //protected: 183 // _Tp &m_value_ref; // A reference to the value we wil change when this object destructs 184 // _Tp m_value; // The value to assign to m_value_ref when this goes out of scope. 185 //}; 186 187 StateType 188 GDBRemoteCommunication::SendContinuePacketAndWaitForResponse 189 ( 190 ProcessGDBRemote *process, 191 const char *payload, 192 size_t packet_length, 193 StringExtractorGDBRemote &response 194 ) 195 { 196 Log *log = ProcessGDBRemoteLog::GetLogIfAllCategoriesSet (GDBR_LOG_PROCESS); 197 if (log) 198 log->Printf ("GDBRemoteCommunication::%s ()", __FUNCTION__); 199 200 Mutex::Locker locker(m_sequence_mutex); 201 m_is_running.SetValue (true, eBroadcastNever); 202 203 // ScopedValueChanger<bool> restore_running_to_false (m_is_running, false); 204 StateType state = eStateRunning; 205 206 if (SendPacket(payload, packet_length) == 0) 207 state = eStateInvalid; 208 209 while (state == eStateRunning) 210 { 211 if (log) 212 log->Printf ("GDBRemoteCommunication::%s () WaitForPacket(...)", __FUNCTION__); 213 214 if (WaitForPacket (response, (TimeValue*)NULL)) 215 { 216 if (response.Empty()) 217 state = eStateInvalid; 218 else 219 { 220 const char stop_type = response.GetChar(); 221 if (log) 222 log->Printf ("GDBRemoteCommunication::%s () got '%c' packet", __FUNCTION__, stop_type); 223 switch (stop_type) 224 { 225 case 'T': 226 case 'S': 227 if (m_async_signal != -1) 228 { 229 // Save off the async signal we are supposed to send 230 const int async_signal = m_async_signal; 231 // Clear the async signal member so we don't end up 232 // sending the signal multiple times... 233 m_async_signal = -1; 234 // Check which signal we stopped with 235 uint8_t signo = response.GetHexU8(255); 236 if (signo == async_signal) 237 { 238 // We already stopped with a signal that we wanted 239 // to stop with, so we are done 240 response.SetFilePos (0); 241 } 242 else 243 { 244 // We stopped with a different signal that the one 245 // we wanted to stop with, so now we must resume 246 // with the signal we want 247 char signal_packet[32]; 248 int signal_packet_len = 0; 249 signal_packet_len = ::snprintf (signal_packet, 250 sizeof (signal_packet), 251 "C%2.2x", 252 async_signal); 253 254 if (SendPacket(signal_packet, signal_packet_len) == 0) 255 { 256 state = eStateInvalid; 257 break; 258 } 259 else 260 continue; 261 } 262 } 263 else if (m_async_packet_predicate.GetValue()) 264 { 265 // We are supposed to send an asynchronous packet while 266 // we are running. 267 m_async_response.Clear(); 268 if (!m_async_packet.empty()) 269 { 270 SendPacketAndWaitForResponse (&m_async_packet[0], 271 m_async_packet.size(), 272 m_async_response, 273 m_async_timeout, 274 false); 275 } 276 // Let the other thread that was trying to send the async 277 // packet know that the packet has been sent. 278 m_async_packet_predicate.SetValue(false, eBroadcastAlways); 279 280 // Continue again 281 if (SendPacket("c", 1) == 0) 282 { 283 state = eStateInvalid; 284 break; 285 } 286 else 287 continue; 288 } 289 // Stop with signal and thread info 290 state = eStateStopped; 291 break; 292 293 case 'W': 294 // process exited 295 state = eStateExited; 296 break; 297 298 case 'O': 299 // STDOUT 300 { 301 std::string inferior_stdout; 302 inferior_stdout.reserve(response.GetBytesLeft () / 2); 303 char ch; 304 while ((ch = response.GetHexU8()) != '\0') 305 inferior_stdout.append(1, ch); 306 process->AppendSTDOUT (inferior_stdout.c_str(), inferior_stdout.size()); 307 } 308 break; 309 310 case 'E': 311 // ERROR 312 state = eStateInvalid; 313 break; 314 315 default: 316 if (log) 317 log->Printf ("GDBRemoteCommunication::%s () got unrecognized async packet: '%s'", __FUNCTION__, stop_type); 318 break; 319 } 320 } 321 } 322 else 323 { 324 if (log) 325 log->Printf ("GDBRemoteCommunication::%s () WaitForPacket(...) => false", __FUNCTION__); 326 state = eStateInvalid; 327 } 328 } 329 if (log) 330 log->Printf ("GDBRemoteCommunication::%s () => %s", __FUNCTION__, StateAsCString(state)); 331 response.SetFilePos(0); 332 m_is_running.SetValue (false, eBroadcastOnChange); 333 return state; 334 } 335 336 size_t 337 GDBRemoteCommunication::SendPacket (const char *payload) 338 { 339 Mutex::Locker locker(m_sequence_mutex); 340 return SendPacketNoLock (payload, ::strlen (payload)); 341 } 342 343 size_t 344 GDBRemoteCommunication::SendPacket (const char *payload, size_t payload_length) 345 { 346 Mutex::Locker locker(m_sequence_mutex); 347 return SendPacketNoLock (payload, payload_length); 348 } 349 350 size_t 351 GDBRemoteCommunication::SendPacketNoLock (const char *payload, size_t payload_length) 352 { 353 if (IsConnected()) 354 { 355 StreamString packet(0, 4, eByteOrderBig); 356 357 packet.PutChar('$'); 358 packet.Write (payload, payload_length); 359 packet.PutChar('#'); 360 packet.PutHex8(CalculcateChecksum (payload, payload_length)); 361 362 ProcessGDBRemoteLog::LogIf (GDBR_LOG_PACKETS, "send packet: %s", packet.GetData()); 363 ConnectionStatus status = eConnectionStatusSuccess; 364 size_t bytes_written = Write (packet.GetData(), packet.GetSize(), status, NULL); 365 if (bytes_written == packet.GetSize()) 366 { 367 if (m_send_acks) 368 { 369 if (GetAck (1) != '+') 370 return 0; 371 } 372 } 373 return bytes_written; 374 } 375 //m_error.SetErrorString("Not connected."); 376 return 0; 377 } 378 379 char 380 GDBRemoteCommunication::GetAck (uint32_t timeout_seconds) 381 { 382 StringExtractorGDBRemote response; 383 if (WaitForPacket (response, timeout_seconds) == 1) 384 return response.GetChar(); 385 return 0; 386 } 387 388 bool 389 GDBRemoteCommunication::GetSequenceMutex (Mutex::Locker& locker) 390 { 391 return locker.TryLock (m_sequence_mutex.GetMutex()); 392 } 393 394 bool 395 GDBRemoteCommunication::SendAsyncSignal (int signo) 396 { 397 m_async_signal = signo; 398 bool timed_out = false; 399 if (SendInterrupt(1, &timed_out)) 400 return true; 401 m_async_signal = -1; 402 return false; 403 } 404 405 bool 406 GDBRemoteCommunication::SendInterrupt (uint32_t seconds_to_wait_for_stop, bool *timed_out) 407 { 408 if (timed_out) 409 *timed_out = false; 410 411 if (IsConnected() && IsRunning()) 412 { 413 // Only send an interrupt if our debugserver is running... 414 if (m_sequence_mutex.TryLock() != 0) 415 { 416 // Someone has the mutex locked waiting for a response or for the 417 // inferior to stop, so send the interrupt on the down low... 418 char ctrl_c = '\x03'; 419 ConnectionStatus status = eConnectionStatusSuccess; 420 TimeValue timeout; 421 if (seconds_to_wait_for_stop) 422 { 423 timeout = TimeValue::Now(); 424 timeout.OffsetWithSeconds (seconds_to_wait_for_stop); 425 } 426 ProcessGDBRemoteLog::LogIf (GDBR_LOG_PACKETS, "send packet: \\x03"); 427 if (Write (&ctrl_c, 1, status, NULL) > 0) 428 { 429 if (seconds_to_wait_for_stop) 430 m_is_running.WaitForValueEqualTo (false, &timeout, timed_out); 431 return true; 432 } 433 } 434 } 435 return false; 436 } 437 438 size_t 439 GDBRemoteCommunication::WaitForPacket (StringExtractorGDBRemote &response, uint32_t timeout_seconds) 440 { 441 TimeValue timeout_time; 442 timeout_time = TimeValue::Now(); 443 timeout_time.OffsetWithSeconds (timeout_seconds); 444 return WaitForPacketNoLock (response, &timeout_time); 445 } 446 447 size_t 448 GDBRemoteCommunication::WaitForPacket (StringExtractorGDBRemote &response, TimeValue* timeout_time_ptr) 449 { 450 Mutex::Locker locker(m_sequence_mutex); 451 return WaitForPacketNoLock (response, timeout_time_ptr); 452 } 453 454 size_t 455 GDBRemoteCommunication::WaitForPacketNoLock (StringExtractorGDBRemote &response, TimeValue* timeout_time_ptr) 456 { 457 bool checksum_error = false; 458 response.Clear (); 459 460 EventSP event_sp; 461 462 if (m_rx_packet_listener.WaitForEvent (timeout_time_ptr, event_sp)) 463 { 464 const uint32_t event_type = event_sp->GetType(); 465 if (event_type | Communication::eBroadcastBitPacketAvailable) 466 { 467 const EventDataBytes *event_bytes = EventDataBytes::GetEventDataFromEvent(event_sp.get()); 468 if (event_bytes) 469 { 470 const char * packet_data = (const char *)event_bytes->GetBytes(); 471 ProcessGDBRemoteLog::LogIf (GDBR_LOG_PACKETS, "read packet: %s", packet_data); 472 const size_t packet_size = event_bytes->GetByteSize(); 473 if (packet_data && packet_size > 0) 474 { 475 std::string &response_str = response.GetStringRef(); 476 if (packet_data[0] == '$') 477 { 478 assert (packet_size >= 4); // Must have at least '$#CC' where CC is checksum 479 assert (packet_data[packet_size-3] == '#'); 480 assert (::isxdigit (packet_data[packet_size-2])); // Must be checksum hex byte 481 assert (::isxdigit (packet_data[packet_size-1])); // Must be checksum hex byte 482 response_str.assign (packet_data + 1, packet_size - 4); 483 if (m_send_acks) 484 { 485 char packet_checksum = strtol (&packet_data[packet_size-2], NULL, 16); 486 char actual_checksum = CalculcateChecksum (&response_str[0], response_str.size()); 487 checksum_error = packet_checksum != actual_checksum; 488 // Send the ack or nack if needed 489 if (checksum_error) 490 SendAck('-'); 491 else 492 SendAck('+'); 493 } 494 } 495 else 496 { 497 response_str.assign (packet_data, packet_size); 498 } 499 return response_str.size(); 500 } 501 } 502 } 503 else if (Communication::eBroadcastBitReadThreadDidExit) 504 { 505 // Our read thread exited on us so just fall through and return zero... 506 } 507 } 508 return 0; 509 } 510 511 void 512 GDBRemoteCommunication::AppendBytesToCache (const uint8_t *src, size_t src_len, bool broadcast) 513 { 514 // Put the packet data into the buffer in a thread safe fashion 515 Mutex::Locker locker(m_bytes_mutex); 516 m_bytes.append ((const char *)src, src_len); 517 518 // Parse up the packets into gdb remote packets 519 while (!m_bytes.empty()) 520 { 521 // end_idx must be one past the last valid packet byte. Start 522 // it off with an invalid value that is the same as the current 523 // index. 524 size_t end_idx = 0; 525 526 switch (m_bytes[0]) 527 { 528 case '+': // Look for ack 529 case '-': // Look for cancel 530 case '\x03': // ^C to halt target 531 end_idx = 1; // The command is one byte long... 532 break; 533 534 case '$': 535 // Look for a standard gdb packet? 536 end_idx = m_bytes.find('#'); 537 if (end_idx != std::string::npos) 538 { 539 if (end_idx + 2 < m_bytes.size()) 540 { 541 end_idx += 3; 542 } 543 else 544 { 545 // Checksum bytes aren't all here yet 546 end_idx = std::string::npos; 547 } 548 } 549 break; 550 551 default: 552 break; 553 } 554 555 if (end_idx == std::string::npos) 556 { 557 //ProcessGDBRemoteLog::LogIf (GDBR_LOG_PACKETS | GDBR_LOG_VERBOSE, "GDBRemoteCommunication::%s packet not yet complete: '%s'",__FUNCTION__, m_bytes.c_str()); 558 return; 559 } 560 else if (end_idx > 0) 561 { 562 // We have a valid packet... 563 assert (end_idx <= m_bytes.size()); 564 std::auto_ptr<EventDataBytes> event_bytes_ap (new EventDataBytes (&m_bytes[0], end_idx)); 565 ProcessGDBRemoteLog::LogIf (GDBR_LOG_COMM, "got full packet: %s", event_bytes_ap->GetBytes()); 566 BroadcastEvent (eBroadcastBitPacketAvailable, event_bytes_ap.release()); 567 m_bytes.erase(0, end_idx); 568 } 569 else 570 { 571 assert (1 <= m_bytes.size()); 572 ProcessGDBRemoteLog::LogIf (GDBR_LOG_COMM, "GDBRemoteCommunication::%s tossing junk byte at %c",__FUNCTION__, m_bytes[0]); 573 m_bytes.erase(0, 1); 574 } 575 } 576 } 577 578 lldb::pid_t 579 GDBRemoteCommunication::GetCurrentProcessID (uint32_t timeout_seconds) 580 { 581 StringExtractorGDBRemote response; 582 if (SendPacketAndWaitForResponse("qC", strlen("qC"), response, timeout_seconds, false)) 583 { 584 if (response.GetChar() == 'Q') 585 if (response.GetChar() == 'C') 586 return response.GetHexMaxU32 (false, LLDB_INVALID_PROCESS_ID); 587 } 588 return LLDB_INVALID_PROCESS_ID; 589 } 590 591 bool 592 GDBRemoteCommunication::GetLaunchSuccess (uint32_t timeout_seconds, std::string &error_str) 593 { 594 error_str.clear(); 595 StringExtractorGDBRemote response; 596 if (SendPacketAndWaitForResponse("qLaunchSuccess", strlen("qLaunchSuccess"), response, timeout_seconds, false)) 597 { 598 if (response.IsOKPacket()) 599 return true; 600 if (response.GetChar() == 'E') 601 { 602 // A string the describes what failed when launching... 603 error_str = response.GetStringRef().substr(1); 604 } 605 else 606 { 607 error_str.assign ("unknown error occurred launching process"); 608 } 609 } 610 else 611 { 612 error_str.assign ("failed to send the qLaunchSuccess packet"); 613 } 614 return false; 615 } 616 617 int 618 GDBRemoteCommunication::SendArgumentsPacket (char const *argv[], uint32_t timeout_seconds) 619 { 620 if (argv && argv[0]) 621 { 622 StreamString packet; 623 packet.PutChar('A'); 624 const char *arg; 625 for (uint32_t i = 0; (arg = argv[i]) != NULL; ++i) 626 { 627 const int arg_len = strlen(arg); 628 if (i > 0) 629 packet.PutChar(','); 630 packet.Printf("%i,%i,", arg_len * 2, i); 631 packet.PutBytesAsRawHex8(arg, arg_len, eByteOrderHost, eByteOrderHost); 632 } 633 634 StringExtractorGDBRemote response; 635 if (SendPacketAndWaitForResponse (packet.GetData(), packet.GetSize(), response, timeout_seconds, false)) 636 { 637 if (response.IsOKPacket()) 638 return 0; 639 uint8_t error = response.GetError(); 640 if (error) 641 return error; 642 } 643 } 644 return -1; 645 } 646 647 int 648 GDBRemoteCommunication::SendEnvironmentPacket (char const *name_equal_value, uint32_t timeout_seconds) 649 { 650 if (name_equal_value && name_equal_value[0]) 651 { 652 StreamString packet; 653 packet.Printf("QEnvironment:%s", name_equal_value); 654 StringExtractorGDBRemote response; 655 if (SendPacketAndWaitForResponse (packet.GetData(), packet.GetSize(), response, timeout_seconds, false)) 656 { 657 if (response.IsOKPacket()) 658 return 0; 659 uint8_t error = response.GetError(); 660 if (error) 661 return error; 662 } 663 } 664 return -1; 665 } 666 667 bool 668 GDBRemoteCommunication::GetHostInfo (uint32_t timeout_seconds) 669 { 670 m_arch.Clear(); 671 m_os.Clear(); 672 m_vendor.Clear(); 673 m_byte_order = eByteOrderHost; 674 m_pointer_byte_size = 0; 675 676 StringExtractorGDBRemote response; 677 if (SendPacketAndWaitForResponse ("qHostInfo", response, timeout_seconds, false)) 678 { 679 if (response.IsUnsupportedPacket()) 680 return false; 681 682 683 std::string name; 684 std::string value; 685 while (response.GetNameColonValue(name, value)) 686 { 687 if (name.compare("cputype") == 0) 688 { 689 // exception type in big endian hex 690 m_arch.SetCPUType(Args::StringToUInt32 (value.c_str(), LLDB_INVALID_CPUTYPE, 0)); 691 } 692 else if (name.compare("cpusubtype") == 0) 693 { 694 // exception count in big endian hex 695 m_arch.SetCPUSubtype(Args::StringToUInt32 (value.c_str(), 0, 0)); 696 } 697 else if (name.compare("ostype") == 0) 698 { 699 // exception data in big endian hex 700 m_os.SetCString(value.c_str()); 701 } 702 else if (name.compare("vendor") == 0) 703 { 704 m_vendor.SetCString(value.c_str()); 705 } 706 else if (name.compare("endian") == 0) 707 { 708 if (value.compare("little") == 0) 709 m_byte_order = eByteOrderLittle; 710 else if (value.compare("big") == 0) 711 m_byte_order = eByteOrderBig; 712 else if (value.compare("pdp") == 0) 713 m_byte_order = eByteOrderPDP; 714 } 715 else if (name.compare("ptrsize") == 0) 716 { 717 m_pointer_byte_size = Args::StringToUInt32 (value.c_str(), 0, 0); 718 } 719 } 720 } 721 return HostInfoIsValid(); 722 } 723 724 int 725 GDBRemoteCommunication::SendAttach 726 ( 727 lldb::pid_t pid, 728 uint32_t timeout_seconds, 729 StringExtractorGDBRemote& response 730 ) 731 { 732 if (pid != LLDB_INVALID_PROCESS_ID) 733 { 734 StreamString packet; 735 packet.Printf("vAttach;%x", pid); 736 737 if (SendPacketAndWaitForResponse (packet.GetData(), packet.GetSize(), response, timeout_seconds, false)) 738 { 739 if (response.IsErrorPacket()) 740 return response.GetError(); 741 return 0; 742 } 743 } 744 return -1; 745 } 746 747 const lldb_private::ArchSpec & 748 GDBRemoteCommunication::GetHostArchitecture () 749 { 750 if (!HostInfoIsValid ()) 751 GetHostInfo (1); 752 return m_arch; 753 } 754 755 const lldb_private::ConstString & 756 GDBRemoteCommunication::GetOSString () 757 { 758 if (!HostInfoIsValid ()) 759 GetHostInfo (1); 760 return m_os; 761 } 762 763 const lldb_private::ConstString & 764 GDBRemoteCommunication::GetVendorString() 765 { 766 if (!HostInfoIsValid ()) 767 GetHostInfo (1); 768 return m_vendor; 769 } 770 771 lldb::ByteOrder 772 GDBRemoteCommunication::GetByteOrder () 773 { 774 if (!HostInfoIsValid ()) 775 GetHostInfo (1); 776 return m_byte_order; 777 } 778 779 uint32_t 780 GDBRemoteCommunication::GetAddressByteSize () 781 { 782 if (!HostInfoIsValid ()) 783 GetHostInfo (1); 784 return m_pointer_byte_size; 785 } 786 787 addr_t 788 GDBRemoteCommunication::AllocateMemory (size_t size, uint32_t permissions, uint32_t timeout_seconds) 789 { 790 char packet[64]; 791 ::snprintf (packet, sizeof(packet), "_M%zx,%s%s%s", size, 792 permissions & lldb::ePermissionsReadable ? "r" : "", 793 permissions & lldb::ePermissionsWritable ? "w" : "", 794 permissions & lldb::ePermissionsExecutable ? "x" : ""); 795 StringExtractorGDBRemote response; 796 if (SendPacketAndWaitForResponse (packet, response, timeout_seconds, false)) 797 { 798 if (!response.IsErrorPacket()) 799 return response.GetHexMaxU64(false, LLDB_INVALID_ADDRESS); 800 } 801 return LLDB_INVALID_ADDRESS; 802 } 803 804 bool 805 GDBRemoteCommunication::DeallocateMemory (addr_t addr, uint32_t timeout_seconds) 806 { 807 char packet[64]; 808 snprintf(packet, sizeof(packet), "_m%llx", (uint64_t)addr); 809 StringExtractorGDBRemote response; 810 if (SendPacketAndWaitForResponse (packet, response, timeout_seconds, false)) 811 { 812 if (!response.IsOKPacket()) 813 return true; 814 } 815 return false; 816 } 817