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Diffstat (limited to 'source/Plugins/Process/Utility/StopInfoMachException.cpp')
| -rw-r--r-- | source/Plugins/Process/Utility/StopInfoMachException.cpp | 482 |
1 files changed, 482 insertions, 0 deletions
diff --git a/source/Plugins/Process/Utility/StopInfoMachException.cpp b/source/Plugins/Process/Utility/StopInfoMachException.cpp new file mode 100644 index 000000000000..51d2052e1931 --- /dev/null +++ b/source/Plugins/Process/Utility/StopInfoMachException.cpp @@ -0,0 +1,482 @@ +//===-- 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) + return StopInfo::CreateStopReasonToTrace(thread); + + // 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()); + } + // 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); + } + 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; + + 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 (bp_site_sp->ValidForThisThread (&thread)) + 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(); +} |