//===-- StopInfoMachException.cpp -------------------------------*- C++ -*-===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// #include "StopInfoMachException.h" // C Includes // C++ Includes // Other libraries and framework includes // Project includes #include "lldb/Breakpoint/Watchpoint.h" #include "lldb/Core/ArchSpec.h" #include "lldb/Core/StreamString.h" #include "lldb/Symbol/Symbol.h" #include "lldb/Target/DynamicLoader.h" #include "lldb/Target/ExecutionContext.h" #include "lldb/Target/Process.h" #include "lldb/Target/RegisterContext.h" #include "lldb/Target/Target.h" #include "lldb/Target/Thread.h" #include "lldb/Target/ThreadPlan.h" #include "lldb/Target/UnixSignals.h" using namespace lldb; using namespace lldb_private; const char * StopInfoMachException::GetDescription () { if (m_description.empty() && m_value != 0) { ExecutionContext exe_ctx (m_thread_wp.lock()); Target *target = exe_ctx.GetTargetPtr(); const llvm::Triple::ArchType cpu = target ? target->GetArchitecture().GetMachine() : llvm::Triple::UnknownArch; const char *exc_desc = NULL; const char *code_label = "code"; const char *code_desc = NULL; const char *subcode_label = "subcode"; const char *subcode_desc = NULL; switch (m_value) { case 1: // EXC_BAD_ACCESS exc_desc = "EXC_BAD_ACCESS"; subcode_label = "address"; switch (cpu) { case llvm::Triple::x86: case llvm::Triple::x86_64: switch (m_exc_code) { case 0xd: code_desc = "EXC_I386_GPFLT"; m_exc_data_count = 1; break; } break; case llvm::Triple::arm: switch (m_exc_code) { case 0x101: code_desc = "EXC_ARM_DA_ALIGN"; break; case 0x102: code_desc = "EXC_ARM_DA_DEBUG"; break; } break; case llvm::Triple::ppc: case llvm::Triple::ppc64: switch (m_exc_code) { case 0x101: code_desc = "EXC_PPC_VM_PROT_READ"; break; case 0x102: code_desc = "EXC_PPC_BADSPACE"; break; case 0x103: code_desc = "EXC_PPC_UNALIGNED"; break; } break; default: break; } break; case 2: // EXC_BAD_INSTRUCTION exc_desc = "EXC_BAD_INSTRUCTION"; switch (cpu) { case llvm::Triple::x86: case llvm::Triple::x86_64: if (m_exc_code == 1) code_desc = "EXC_I386_INVOP"; break; case llvm::Triple::ppc: case llvm::Triple::ppc64: switch (m_exc_code) { case 1: code_desc = "EXC_PPC_INVALID_SYSCALL"; break; case 2: code_desc = "EXC_PPC_UNIPL_INST"; break; case 3: code_desc = "EXC_PPC_PRIVINST"; break; case 4: code_desc = "EXC_PPC_PRIVREG"; break; case 5: code_desc = "EXC_PPC_TRACE"; break; case 6: code_desc = "EXC_PPC_PERFMON"; break; } break; case llvm::Triple::arm: if (m_exc_code == 1) code_desc = "EXC_ARM_UNDEFINED"; break; default: break; } break; case 3: // EXC_ARITHMETIC exc_desc = "EXC_ARITHMETIC"; switch (cpu) { case llvm::Triple::x86: case llvm::Triple::x86_64: switch (m_exc_code) { case 1: code_desc = "EXC_I386_DIV"; break; case 2: code_desc = "EXC_I386_INTO"; break; case 3: code_desc = "EXC_I386_NOEXT"; break; case 4: code_desc = "EXC_I386_EXTOVR"; break; case 5: code_desc = "EXC_I386_EXTERR"; break; case 6: code_desc = "EXC_I386_EMERR"; break; case 7: code_desc = "EXC_I386_BOUND"; break; case 8: code_desc = "EXC_I386_SSEEXTERR"; break; } break; case llvm::Triple::ppc: case llvm::Triple::ppc64: switch (m_exc_code) { case 1: code_desc = "EXC_PPC_OVERFLOW"; break; case 2: code_desc = "EXC_PPC_ZERO_DIVIDE"; break; case 3: code_desc = "EXC_PPC_FLT_INEXACT"; break; case 4: code_desc = "EXC_PPC_FLT_ZERO_DIVIDE"; break; case 5: code_desc = "EXC_PPC_FLT_UNDERFLOW"; break; case 6: code_desc = "EXC_PPC_FLT_OVERFLOW"; break; case 7: code_desc = "EXC_PPC_FLT_NOT_A_NUMBER"; break; } break; default: break; } break; case 4: // EXC_EMULATION exc_desc = "EXC_EMULATION"; break; case 5: // EXC_SOFTWARE exc_desc = "EXC_SOFTWARE"; if (m_exc_code == 0x10003) { subcode_desc = "EXC_SOFT_SIGNAL"; subcode_label = "signo"; } break; case 6: // EXC_BREAKPOINT { exc_desc = "EXC_BREAKPOINT"; switch (cpu) { case llvm::Triple::x86: case llvm::Triple::x86_64: switch (m_exc_code) { case 1: code_desc = "EXC_I386_SGL"; break; case 2: code_desc = "EXC_I386_BPT"; break; } break; case llvm::Triple::ppc: case llvm::Triple::ppc64: switch (m_exc_code) { case 1: code_desc = "EXC_PPC_BREAKPOINT"; break; } break; case llvm::Triple::arm: switch (m_exc_code) { case 0x101: code_desc = "EXC_ARM_DA_ALIGN"; break; case 0x102: code_desc = "EXC_ARM_DA_DEBUG"; break; case 1: code_desc = "EXC_ARM_BREAKPOINT"; break; // FIXME temporary workaround, exc_code 0 does not really mean EXC_ARM_BREAKPOINT case 0: code_desc = "EXC_ARM_BREAKPOINT"; break; } break; default: break; } } break; case 7: exc_desc = "EXC_SYSCALL"; break; case 8: exc_desc = "EXC_MACH_SYSCALL"; break; case 9: exc_desc = "EXC_RPC_ALERT"; break; case 10: exc_desc = "EXC_CRASH"; break; case 11: exc_desc = "EXC_RESOURCE"; break; case 12: exc_desc = "EXC_GUARD"; break; } StreamString strm; if (exc_desc) strm.PutCString(exc_desc); else strm.Printf("EXC_??? (%" PRIu64 ")", m_value); if (m_exc_data_count >= 1) { if (code_desc) strm.Printf(" (%s=%s", code_label, code_desc); else strm.Printf(" (%s=%" PRIu64, code_label, m_exc_code); } if (m_exc_data_count >= 2) { if (subcode_desc) strm.Printf(", %s=%s", subcode_label, subcode_desc); else strm.Printf(", %s=0x%" PRIx64, subcode_label, m_exc_subcode); } if (m_exc_data_count > 0) strm.PutChar(')'); m_description.swap (strm.GetString()); } return m_description.c_str(); } StopInfoSP StopInfoMachException::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 ) { if (exc_type != 0) { uint32_t pc_decrement = 0; ExecutionContext exe_ctx (thread.shared_from_this()); Target *target = exe_ctx.GetTargetPtr(); const llvm::Triple::ArchType cpu = target ? target->GetArchitecture().GetMachine() : llvm::Triple::UnknownArch; switch (exc_type) { case 1: // EXC_BAD_ACCESS break; case 2: // EXC_BAD_INSTRUCTION switch (cpu) { case llvm::Triple::ppc: case llvm::Triple::ppc64: switch (exc_code) { case 1: // EXC_PPC_INVALID_SYSCALL case 2: // EXC_PPC_UNIPL_INST case 3: // EXC_PPC_PRIVINST case 4: // EXC_PPC_PRIVREG break; case 5: // EXC_PPC_TRACE return StopInfo::CreateStopReasonToTrace (thread); case 6: // EXC_PPC_PERFMON break; } break; default: break; } break; case 3: // EXC_ARITHMETIC case 4: // EXC_EMULATION break; case 5: // EXC_SOFTWARE if (exc_code == 0x10003) // EXC_SOFT_SIGNAL { if (exc_sub_code == 5) { // On MacOSX, a SIGTRAP can signify that a process has called // exec, so we should check with our dynamic loader to verify. ProcessSP process_sp (thread.GetProcess()); if (process_sp) { DynamicLoader *dynamic_loader = process_sp->GetDynamicLoader(); if (dynamic_loader && dynamic_loader->ProcessDidExec()) { // The program was re-exec'ed return StopInfo::CreateStopReasonWithExec (thread); } // if (!process_did_exec) // { // // We have a SIGTRAP, make sure we didn't exec by checking // // for the PC being at "_dyld_start"... // lldb::StackFrameSP frame_sp (thread.GetStackFrameAtIndex(0)); // if (frame_sp) // { // const Symbol *symbol = frame_sp->GetSymbolContext(eSymbolContextSymbol).symbol; // if (symbol) // { // if (symbol->GetName() == ConstString("_dyld_start")) // process_did_exec = true; // } // } // } } } return StopInfo::CreateStopReasonWithSignal (thread, exc_sub_code); } break; case 6: // EXC_BREAKPOINT { bool is_actual_breakpoint = false; bool is_trace_if_actual_breakpoint_missing = false; switch (cpu) { case llvm::Triple::x86: case llvm::Triple::x86_64: if (exc_code == 1) // EXC_I386_SGL { if (!exc_sub_code) { // This looks like a plain trap. // Have to check if there is a breakpoint here as well. When you single-step onto a trap, // the single step stops you not to trap. Since we also do that check below, let's just use // that logic. is_actual_breakpoint = true; is_trace_if_actual_breakpoint_missing = true; } else { // It's a watchpoint, then. // The exc_sub_code indicates the data break address. lldb::WatchpointSP wp_sp; if (target) wp_sp = target->GetWatchpointList().FindByAddress((lldb::addr_t)exc_sub_code); if (wp_sp && wp_sp->IsEnabled()) { // Debugserver may piggyback the hardware index of the fired watchpoint in the exception data. // Set the hardware index if that's the case. if (exc_data_count >=3) wp_sp->SetHardwareIndex((uint32_t)exc_sub_sub_code); return StopInfo::CreateStopReasonWithWatchpointID(thread, wp_sp->GetID()); } } } else if (exc_code == 2 || // EXC_I386_BPT exc_code == 3) // EXC_I386_BPTFLT { // KDP returns EXC_I386_BPTFLT for trace breakpoints if (exc_code == 3) is_trace_if_actual_breakpoint_missing = true; is_actual_breakpoint = true; if (!pc_already_adjusted) pc_decrement = 1; } break; case llvm::Triple::ppc: case llvm::Triple::ppc64: is_actual_breakpoint = exc_code == 1; // EXC_PPC_BREAKPOINT break; case llvm::Triple::arm: if (exc_code == 0x102) // EXC_ARM_DA_DEBUG { // It's a watchpoint, then, if the exc_sub_code indicates a known/enabled // data break address from our watchpoint list. lldb::WatchpointSP wp_sp; if (target) wp_sp = target->GetWatchpointList().FindByAddress((lldb::addr_t)exc_sub_code); if (wp_sp && wp_sp->IsEnabled()) { // Debugserver may piggyback the hardware index of the fired watchpoint in the exception data. // Set the hardware index if that's the case. if (exc_data_count >=3) wp_sp->SetHardwareIndex((uint32_t)exc_sub_sub_code); return StopInfo::CreateStopReasonWithWatchpointID(thread, wp_sp->GetID()); } else { is_actual_breakpoint = true; is_trace_if_actual_breakpoint_missing = true; } } else if (exc_code == 1) // EXC_ARM_BREAKPOINT { is_actual_breakpoint = true; is_trace_if_actual_breakpoint_missing = true; } 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 { is_actual_breakpoint = true; is_trace_if_actual_breakpoint_missing = true; } break; case llvm::Triple::aarch64: { if (exc_code == 1 && exc_sub_code == 0) // EXC_ARM_BREAKPOINT { // This is hit when we single instruction step aka MDSCR_EL1 SS bit 0 is set return StopInfo::CreateStopReasonToTrace(thread); } if (exc_code == 0x102) // EXC_ARM_DA_DEBUG { // It's a watchpoint, then, if the exc_sub_code indicates a known/enabled // data break address from our watchpoint list. lldb::WatchpointSP wp_sp; if (target) wp_sp = target->GetWatchpointList().FindByAddress((lldb::addr_t)exc_sub_code); if (wp_sp && wp_sp->IsEnabled()) { // Debugserver may piggyback the hardware index of the fired watchpoint in the exception data. // Set the hardware index if that's the case. if (exc_data_count >= 3) wp_sp->SetHardwareIndex((uint32_t)exc_sub_sub_code); return StopInfo::CreateStopReasonWithWatchpointID(thread, wp_sp->GetID()); } // EXC_ARM_DA_DEBUG seems to be reused for EXC_BREAKPOINT as well as EXC_BAD_ACCESS if (thread.GetTemporaryResumeState() == eStateStepping) return StopInfo::CreateStopReasonToTrace(thread); } // It looks like exc_sub_code has the 4 bytes of the instruction that triggered the // exception, i.e. our breakpoint opcode is_actual_breakpoint = exc_code == 1; break; } default: break; } if (is_actual_breakpoint) { RegisterContextSP reg_ctx_sp (thread.GetRegisterContext()); addr_t pc = reg_ctx_sp->GetPC() - pc_decrement; ProcessSP process_sp (thread.CalculateProcess()); lldb::BreakpointSiteSP bp_site_sp; if (process_sp) bp_site_sp = process_sp->GetBreakpointSiteList().FindByAddress(pc); if (bp_site_sp && bp_site_sp->IsEnabled()) { // Update the PC if we were asked to do so, but only do // so if we find a breakpoint that we know about cause // this could be a trap instruction in the code if (pc_decrement > 0 && adjust_pc_if_needed) reg_ctx_sp->SetPC (pc); // If the breakpoint is for this thread, then we'll report the hit, but if it is for another thread, // we can just report no reason. We don't need to worry about stepping over the breakpoint here, that // will be taken care of when the thread resumes and notices that there's a breakpoint under the pc. // If we have an operating system plug-in, we might have set a thread specific breakpoint using the // operating system thread ID, so we can't make any assumptions about the thread ID so we must always // report the breakpoint regardless of the thread. if (bp_site_sp->ValidForThisThread (&thread) || thread.GetProcess()->GetOperatingSystem () != NULL) return StopInfo::CreateStopReasonWithBreakpointSiteID (thread, bp_site_sp->GetID()); else return StopInfoSP(); } // Don't call this a trace if we weren't single stepping this thread. if (is_trace_if_actual_breakpoint_missing && thread.GetTemporaryResumeState() == eStateStepping) { return StopInfo::CreateStopReasonToTrace (thread); } } } break; case 7: // EXC_SYSCALL case 8: // EXC_MACH_SYSCALL case 9: // EXC_RPC_ALERT case 10: // EXC_CRASH break; } return StopInfoSP(new StopInfoMachException (thread, exc_type, exc_data_count, exc_code, exc_sub_code)); } return StopInfoSP(); }