如何调试非法指令异常？
当尝试使用 mdbglib 中的 dbgeng 时，我遇到此异常：0x037ba4f4 处的第一次机会异常 (dbgeng. ASDumpAnalyzer.exe 中的 dll）：0xC000001D：非法指令。我想知道如何调试这个？
它正在抛出汇编指令 vmcpuid。当我跳过该指令时，代码按预期工作。
堆栈跟踪：
dbgeng.dll!X86IsVirtualMachine() + 0x44 bytes
dbgeng.dll!LiveUserDebugServices::GetTargetInfo() + 0x95 bytes
dbgeng.dll!LiveUserTargetInfo::InitFromServices() + 0x95 bytes
dbgeng.dll!LiveUserTargetInfo::WaitForEvent() + 0x4f bytes
dbgeng.dll!WaitForAnyTarget() + 0x5f bytes
dbgeng.dll!RawWaitForEvent() + 0x2ae bytes
dbgeng.dll!DebugClient::WaitForEvent() + 0xb0 bytes
[Managed to Native Transition]
mdbglib.dll!MS::Debuggers::DbgEng::DebugControl::WaitForEvent(unsigned int timeout = 0) Line 107 + 0x38 bytes C++
mdbglib.dll!MS::Debuggers::DbgEng::Debuggee::WaitForEvent(unsigned int timeout = 0) Line 365 C++
ASDumpAnalyzer.exe!ASDumpAnalyzer.Program.WriteMemoryDump() Line 51 + 0xd bytes C#
ASDumpAnalyzer.exe!ASDumpAnalyzer.Program.Main() Line 21 + 0x5 bytes C#
mscoree.dll!__CorExeMain@0() + 0x34 bytes
kernel32.dll!_BaseProcessStart@4() + 0x23 bytes
I'm getting this exception when trying to use dbgeng from mdbglib: First-chance exception at 0x037ba4f4 (dbgeng.dll) in ASDumpAnalyzer.exe: 0xC000001D: Illegal Instruction. I'm wondering how to go about debugging this?
It is throwing on the assembly instruction vmcpuid. When I step over that instruction the code works as expected.
Stack trace:
dbgeng.dll!X86IsVirtualMachine() + 0x44 bytes
dbgeng.dll!LiveUserDebugServices::GetTargetInfo() + 0x95 bytes
dbgeng.dll!LiveUserTargetInfo::InitFromServices() + 0x95 bytes
dbgeng.dll!LiveUserTargetInfo::WaitForEvent() + 0x4f bytes
dbgeng.dll!WaitForAnyTarget() + 0x5f bytes
dbgeng.dll!RawWaitForEvent() + 0x2ae bytes
dbgeng.dll!DebugClient::WaitForEvent() + 0xb0 bytes
[Managed to Native Transition]
mdbglib.dll!MS::Debuggers::DbgEng::DebugControl::WaitForEvent(unsigned int timeout = 0) Line 107 + 0x38 bytes C++
mdbglib.dll!MS::Debuggers::DbgEng::Debuggee::WaitForEvent(unsigned int timeout = 0) Line 365 C++
ASDumpAnalyzer.exe!ASDumpAnalyzer.Program.WriteMemoryDump() Line 51 + 0xd bytes C#
ASDumpAnalyzer.exe!ASDumpAnalyzer.Program.Main() Line 21 + 0x5 bytes C#
mscoree.dll!__CorExeMain@0() + 0x34 bytes
kernel32.dll!_BaseProcessStart@4() + 0x23 bytes
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评论（1）
您是否尝试过不打破第一次机会异常？我敢打赌 X86IsVirtualMachine 在 VMCPUID 周围有一个
__try/__finally块...因为它不是有效的指令，您可能没有在虚拟机下运行。Have you tried not breaking on first chance exceptions? I bet that X86IsVirtualMachine has a
__try/__finallyblock around VMCPUID... since it's not a valid instruction you're probably not running under a VM.