[x86/Linux] Fix SIGSEGV on Debugger.Break() during debugging.

SIGSEGV occur in src/vm/i386/cgenx86.cpp `HelperMethodFrame::UpdateRegDisplay()` at line `pRD->pCurrentContext->Eip = pRD->ControlPC = m_MachState.GetRetAddr();`, since `pRD->pCurrentContext` is NULL.
The point of issue - wrong code block compilation in DebuggerWalkStack() in case of Linux x86.

diff --git a/src/debug/ee/frameinfo.cpp b/src/debug/ee/frameinfo.cpp
index 3efbddd..a4741df 100644 (file)
--- a/src/debug/ee/frameinfo.cpp
+++ b/src/debug/ee/frameinfo.cpp
@@ -2097,7 +2097,7 @@ StackWalkAction DebuggerWalkStack(Thread *thread,
 #endif
             memset((void *)&data, 0, sizeof(data));
 
-#if defined(_TARGET_X86_)
+#if !defined(WIN64EXCEPTIONS)
             // @todo - this seems pointless. context->Eip will be 0; and when we copy it over to the DebuggerRD,
             // the context will be completely null.
             data.regDisplay.ControlPC = context->Eip;