1 //===-- StopInfoMachException.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 #include "StopInfoMachException.h" 11 12 // C Includes 13 // C++ Includes 14 // Other libraries and framework includes 15 // Project includes 16 #include "lldb/Breakpoint/Watchpoint.h" 17 #include "lldb/Core/ArchSpec.h" 18 #include "lldb/Core/StreamString.h" 19 #include "lldb/Symbol/Symbol.h" 20 #include "lldb/Target/DynamicLoader.h" 21 #include "lldb/Target/ExecutionContext.h" 22 #include "lldb/Target/Process.h" 23 #include "lldb/Target/RegisterContext.h" 24 #include "lldb/Target/Target.h" 25 #include "lldb/Target/Thread.h" 26 #include "lldb/Target/ThreadPlan.h" 27 #include "lldb/Target/UnixSignals.h" 28 29 using namespace lldb; 30 using namespace lldb_private; 31 32 const char * GetDescription()33 StopInfoMachException::GetDescription () 34 { 35 if (m_description.empty() && m_value != 0) 36 { 37 ExecutionContext exe_ctx (m_thread_wp.lock()); 38 Target *target = exe_ctx.GetTargetPtr(); 39 const llvm::Triple::ArchType cpu = target ? target->GetArchitecture().GetMachine() : llvm::Triple::UnknownArch; 40 41 const char *exc_desc = NULL; 42 const char *code_label = "code"; 43 const char *code_desc = NULL; 44 const char *subcode_label = "subcode"; 45 const char *subcode_desc = NULL; 46 switch (m_value) 47 { 48 case 1: // EXC_BAD_ACCESS 49 exc_desc = "EXC_BAD_ACCESS"; 50 subcode_label = "address"; 51 switch (cpu) 52 { 53 case llvm::Triple::x86: 54 case llvm::Triple::x86_64: 55 switch (m_exc_code) 56 { 57 case 0xd: code_desc = "EXC_I386_GPFLT"; m_exc_data_count = 1; break; 58 } 59 break; 60 case llvm::Triple::arm: 61 switch (m_exc_code) 62 { 63 case 0x101: code_desc = "EXC_ARM_DA_ALIGN"; break; 64 case 0x102: code_desc = "EXC_ARM_DA_DEBUG"; break; 65 } 66 break; 67 68 case llvm::Triple::ppc: 69 case llvm::Triple::ppc64: 70 switch (m_exc_code) 71 { 72 case 0x101: code_desc = "EXC_PPC_VM_PROT_READ"; break; 73 case 0x102: code_desc = "EXC_PPC_BADSPACE"; break; 74 case 0x103: code_desc = "EXC_PPC_UNALIGNED"; break; 75 } 76 break; 77 78 default: 79 break; 80 } 81 break; 82 83 case 2: // EXC_BAD_INSTRUCTION 84 exc_desc = "EXC_BAD_INSTRUCTION"; 85 switch (cpu) 86 { 87 case llvm::Triple::x86: 88 case llvm::Triple::x86_64: 89 if (m_exc_code == 1) 90 code_desc = "EXC_I386_INVOP"; 91 break; 92 93 case llvm::Triple::ppc: 94 case llvm::Triple::ppc64: 95 switch (m_exc_code) 96 { 97 case 1: code_desc = "EXC_PPC_INVALID_SYSCALL"; break; 98 case 2: code_desc = "EXC_PPC_UNIPL_INST"; break; 99 case 3: code_desc = "EXC_PPC_PRIVINST"; break; 100 case 4: code_desc = "EXC_PPC_PRIVREG"; break; 101 case 5: code_desc = "EXC_PPC_TRACE"; break; 102 case 6: code_desc = "EXC_PPC_PERFMON"; break; 103 } 104 break; 105 106 case llvm::Triple::arm: 107 if (m_exc_code == 1) 108 code_desc = "EXC_ARM_UNDEFINED"; 109 break; 110 111 default: 112 break; 113 } 114 break; 115 116 case 3: // EXC_ARITHMETIC 117 exc_desc = "EXC_ARITHMETIC"; 118 switch (cpu) 119 { 120 case llvm::Triple::x86: 121 case llvm::Triple::x86_64: 122 switch (m_exc_code) 123 { 124 case 1: code_desc = "EXC_I386_DIV"; break; 125 case 2: code_desc = "EXC_I386_INTO"; break; 126 case 3: code_desc = "EXC_I386_NOEXT"; break; 127 case 4: code_desc = "EXC_I386_EXTOVR"; break; 128 case 5: code_desc = "EXC_I386_EXTERR"; break; 129 case 6: code_desc = "EXC_I386_EMERR"; break; 130 case 7: code_desc = "EXC_I386_BOUND"; break; 131 case 8: code_desc = "EXC_I386_SSEEXTERR"; break; 132 } 133 break; 134 135 case llvm::Triple::ppc: 136 case llvm::Triple::ppc64: 137 switch (m_exc_code) 138 { 139 case 1: code_desc = "EXC_PPC_OVERFLOW"; break; 140 case 2: code_desc = "EXC_PPC_ZERO_DIVIDE"; break; 141 case 3: code_desc = "EXC_PPC_FLT_INEXACT"; break; 142 case 4: code_desc = "EXC_PPC_FLT_ZERO_DIVIDE"; break; 143 case 5: code_desc = "EXC_PPC_FLT_UNDERFLOW"; break; 144 case 6: code_desc = "EXC_PPC_FLT_OVERFLOW"; break; 145 case 7: code_desc = "EXC_PPC_FLT_NOT_A_NUMBER"; break; 146 } 147 break; 148 149 default: 150 break; 151 } 152 break; 153 154 case 4: // EXC_EMULATION 155 exc_desc = "EXC_EMULATION"; 156 break; 157 158 159 case 5: // EXC_SOFTWARE 160 exc_desc = "EXC_SOFTWARE"; 161 if (m_exc_code == 0x10003) 162 { 163 subcode_desc = "EXC_SOFT_SIGNAL"; 164 subcode_label = "signo"; 165 } 166 break; 167 168 case 6: // EXC_BREAKPOINT 169 { 170 exc_desc = "EXC_BREAKPOINT"; 171 switch (cpu) 172 { 173 case llvm::Triple::x86: 174 case llvm::Triple::x86_64: 175 switch (m_exc_code) 176 { 177 case 1: code_desc = "EXC_I386_SGL"; break; 178 case 2: code_desc = "EXC_I386_BPT"; break; 179 } 180 break; 181 182 case llvm::Triple::ppc: 183 case llvm::Triple::ppc64: 184 switch (m_exc_code) 185 { 186 case 1: code_desc = "EXC_PPC_BREAKPOINT"; break; 187 } 188 break; 189 190 case llvm::Triple::arm: 191 switch (m_exc_code) 192 { 193 case 0x101: code_desc = "EXC_ARM_DA_ALIGN"; break; 194 case 0x102: code_desc = "EXC_ARM_DA_DEBUG"; break; 195 case 1: code_desc = "EXC_ARM_BREAKPOINT"; break; 196 // FIXME temporary workaround, exc_code 0 does not really mean EXC_ARM_BREAKPOINT 197 case 0: code_desc = "EXC_ARM_BREAKPOINT"; break; 198 } 199 break; 200 201 default: 202 break; 203 } 204 } 205 break; 206 207 case 7: 208 exc_desc = "EXC_SYSCALL"; 209 break; 210 211 case 8: 212 exc_desc = "EXC_MACH_SYSCALL"; 213 break; 214 215 case 9: 216 exc_desc = "EXC_RPC_ALERT"; 217 break; 218 219 case 10: 220 exc_desc = "EXC_CRASH"; 221 break; 222 case 11: 223 exc_desc = "EXC_RESOURCE"; 224 break; 225 case 12: 226 exc_desc = "EXC_GUARD"; 227 break; 228 } 229 230 StreamString strm; 231 232 if (exc_desc) 233 strm.PutCString(exc_desc); 234 else 235 strm.Printf("EXC_??? (%" PRIu64 ")", m_value); 236 237 if (m_exc_data_count >= 1) 238 { 239 if (code_desc) 240 strm.Printf(" (%s=%s", code_label, code_desc); 241 else 242 strm.Printf(" (%s=%" PRIu64, code_label, m_exc_code); 243 } 244 245 if (m_exc_data_count >= 2) 246 { 247 if (subcode_desc) 248 strm.Printf(", %s=%s", subcode_label, subcode_desc); 249 else 250 strm.Printf(", %s=0x%" PRIx64, subcode_label, m_exc_subcode); 251 } 252 253 if (m_exc_data_count > 0) 254 strm.PutChar(')'); 255 256 m_description.swap (strm.GetString()); 257 } 258 return m_description.c_str(); 259 } 260 261 262 263 264 265 StopInfoSP CreateStopReasonWithMachException(Thread & thread,uint32_t exc_type,uint32_t exc_data_count,uint64_t exc_code,uint64_t exc_sub_code,uint64_t exc_sub_sub_code,bool pc_already_adjusted,bool adjust_pc_if_needed)266 StopInfoMachException::CreateStopReasonWithMachException 267 ( 268 Thread &thread, 269 uint32_t exc_type, 270 uint32_t exc_data_count, 271 uint64_t exc_code, 272 uint64_t exc_sub_code, 273 uint64_t exc_sub_sub_code, 274 bool pc_already_adjusted, 275 bool adjust_pc_if_needed 276 ) 277 { 278 if (exc_type != 0) 279 { 280 uint32_t pc_decrement = 0; 281 ExecutionContext exe_ctx (thread.shared_from_this()); 282 Target *target = exe_ctx.GetTargetPtr(); 283 const llvm::Triple::ArchType cpu = target ? target->GetArchitecture().GetMachine() : llvm::Triple::UnknownArch; 284 285 switch (exc_type) 286 { 287 case 1: // EXC_BAD_ACCESS 288 break; 289 290 case 2: // EXC_BAD_INSTRUCTION 291 switch (cpu) 292 { 293 case llvm::Triple::ppc: 294 case llvm::Triple::ppc64: 295 switch (exc_code) 296 { 297 case 1: // EXC_PPC_INVALID_SYSCALL 298 case 2: // EXC_PPC_UNIPL_INST 299 case 3: // EXC_PPC_PRIVINST 300 case 4: // EXC_PPC_PRIVREG 301 break; 302 case 5: // EXC_PPC_TRACE 303 return StopInfo::CreateStopReasonToTrace (thread); 304 case 6: // EXC_PPC_PERFMON 305 break; 306 } 307 break; 308 309 default: 310 break; 311 } 312 break; 313 314 case 3: // EXC_ARITHMETIC 315 case 4: // EXC_EMULATION 316 break; 317 318 case 5: // EXC_SOFTWARE 319 if (exc_code == 0x10003) // EXC_SOFT_SIGNAL 320 { 321 if (exc_sub_code == 5) 322 { 323 // On MacOSX, a SIGTRAP can signify that a process has called 324 // exec, so we should check with our dynamic loader to verify. 325 ProcessSP process_sp (thread.GetProcess()); 326 if (process_sp) 327 { 328 DynamicLoader *dynamic_loader = process_sp->GetDynamicLoader(); 329 if (dynamic_loader && dynamic_loader->ProcessDidExec()) 330 { 331 // The program was re-exec'ed 332 return StopInfo::CreateStopReasonWithExec (thread); 333 } 334 // if (!process_did_exec) 335 // { 336 // // We have a SIGTRAP, make sure we didn't exec by checking 337 // // for the PC being at "_dyld_start"... 338 // lldb::StackFrameSP frame_sp (thread.GetStackFrameAtIndex(0)); 339 // if (frame_sp) 340 // { 341 // const Symbol *symbol = frame_sp->GetSymbolContext(eSymbolContextSymbol).symbol; 342 // if (symbol) 343 // { 344 // if (symbol->GetName() == ConstString("_dyld_start")) 345 // process_did_exec = true; 346 // } 347 // } 348 // } 349 } 350 } 351 return StopInfo::CreateStopReasonWithSignal (thread, exc_sub_code); 352 } 353 break; 354 355 case 6: // EXC_BREAKPOINT 356 { 357 bool is_actual_breakpoint = false; 358 bool is_trace_if_actual_breakpoint_missing = false; 359 switch (cpu) 360 { 361 case llvm::Triple::x86: 362 case llvm::Triple::x86_64: 363 if (exc_code == 1) // EXC_I386_SGL 364 { 365 if (!exc_sub_code) 366 return StopInfo::CreateStopReasonToTrace(thread); 367 368 // It's a watchpoint, then. 369 // The exc_sub_code indicates the data break address. 370 lldb::WatchpointSP wp_sp; 371 if (target) 372 wp_sp = target->GetWatchpointList().FindByAddress((lldb::addr_t)exc_sub_code); 373 if (wp_sp && wp_sp->IsEnabled()) 374 { 375 // Debugserver may piggyback the hardware index of the fired watchpoint in the exception data. 376 // Set the hardware index if that's the case. 377 if (exc_data_count >=3) 378 wp_sp->SetHardwareIndex((uint32_t)exc_sub_sub_code); 379 return StopInfo::CreateStopReasonWithWatchpointID(thread, wp_sp->GetID()); 380 } 381 } 382 else if (exc_code == 2 || // EXC_I386_BPT 383 exc_code == 3) // EXC_I386_BPTFLT 384 { 385 // KDP returns EXC_I386_BPTFLT for trace breakpoints 386 if (exc_code == 3) 387 is_trace_if_actual_breakpoint_missing = true; 388 389 is_actual_breakpoint = true; 390 if (!pc_already_adjusted) 391 pc_decrement = 1; 392 } 393 break; 394 395 case llvm::Triple::ppc: 396 case llvm::Triple::ppc64: 397 is_actual_breakpoint = exc_code == 1; // EXC_PPC_BREAKPOINT 398 break; 399 400 case llvm::Triple::arm: 401 if (exc_code == 0x102) // EXC_ARM_DA_DEBUG 402 { 403 // It's a watchpoint, then, if the exc_sub_code indicates a known/enabled 404 // data break address from our watchpoint list. 405 lldb::WatchpointSP wp_sp; 406 if (target) 407 wp_sp = target->GetWatchpointList().FindByAddress((lldb::addr_t)exc_sub_code); 408 if (wp_sp && wp_sp->IsEnabled()) 409 { 410 // Debugserver may piggyback the hardware index of the fired watchpoint in the exception data. 411 // Set the hardware index if that's the case. 412 if (exc_data_count >=3) 413 wp_sp->SetHardwareIndex((uint32_t)exc_sub_sub_code); 414 return StopInfo::CreateStopReasonWithWatchpointID(thread, wp_sp->GetID()); 415 } 416 // EXC_ARM_DA_DEBUG seems to be reused for EXC_BREAKPOINT as well as EXC_BAD_ACCESS 417 if (thread.GetTemporaryResumeState() == eStateStepping) 418 return StopInfo::CreateStopReasonToTrace(thread); 419 } 420 else if (exc_code == 1) // EXC_ARM_BREAKPOINT 421 { 422 is_actual_breakpoint = true; 423 is_trace_if_actual_breakpoint_missing = true; 424 } 425 else if (exc_code == 0) // FIXME not EXC_ARM_BREAKPOINT but a kernel is currently returning this so accept it as indicating a breakpoint until the kernel is fixed 426 { 427 is_actual_breakpoint = true; 428 is_trace_if_actual_breakpoint_missing = true; 429 } 430 break; 431 432 default: 433 break; 434 } 435 436 if (is_actual_breakpoint) 437 { 438 RegisterContextSP reg_ctx_sp (thread.GetRegisterContext()); 439 addr_t pc = reg_ctx_sp->GetPC() - pc_decrement; 440 441 ProcessSP process_sp (thread.CalculateProcess()); 442 443 lldb::BreakpointSiteSP bp_site_sp; 444 if (process_sp) 445 bp_site_sp = process_sp->GetBreakpointSiteList().FindByAddress(pc); 446 if (bp_site_sp && bp_site_sp->IsEnabled()) 447 { 448 // Update the PC if we were asked to do so, but only do 449 // so if we find a breakpoint that we know about cause 450 // this could be a trap instruction in the code 451 if (pc_decrement > 0 && adjust_pc_if_needed) 452 reg_ctx_sp->SetPC (pc); 453 454 // If the breakpoint is for this thread, then we'll report the hit, but if it is for another thread, 455 // we can just report no reason. We don't need to worry about stepping over the breakpoint here, that 456 // will be taken care of when the thread resumes and notices that there's a breakpoint under the pc. 457 if (bp_site_sp->ValidForThisThread (&thread)) 458 return StopInfo::CreateStopReasonWithBreakpointSiteID (thread, bp_site_sp->GetID()); 459 else 460 return StopInfoSP(); 461 } 462 463 // Don't call this a trace if we weren't single stepping this thread. 464 if (is_trace_if_actual_breakpoint_missing && thread.GetTemporaryResumeState() == eStateStepping) 465 { 466 return StopInfo::CreateStopReasonToTrace (thread); 467 } 468 } 469 } 470 break; 471 472 case 7: // EXC_SYSCALL 473 case 8: // EXC_MACH_SYSCALL 474 case 9: // EXC_RPC_ALERT 475 case 10: // EXC_CRASH 476 break; 477 } 478 479 return StopInfoSP(new StopInfoMachException (thread, exc_type, exc_data_count, exc_code, exc_sub_code)); 480 } 481 return StopInfoSP(); 482 } 483