* cygtls.cc (_cygtls::handle_threadlist_exception): Make it clear that the
function never actually returns. * exceptions.cc (_cygtls::handle_exceptions): Jump out of function rather than returning to avoid meddling by previously installed exception handlers.
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@@ -659,7 +659,21 @@ _cygtls::handle_exceptions (EXCEPTION_RECORD *e, exception_list *frame, CONTEXT
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sig_send (NULL, si, &me); // Signal myself
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me.incyg--;
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e->ExceptionFlags = 0;
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return 0;
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/* The OS adds an exception list frame to the stack. It expects to be
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able to remove this entry after the exception handler returned.
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However, when unwinding to our frame, our frame becomes the uppermost
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frame on the stack (%fs:0 points to frame). This way, our frame
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is removed from the exception stack and just disappears. So, we can't
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just return here or things will be screwed up by the helpful function
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in (presumably) ntdll.dll.
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So, instead, we will do the equivalent of a longjmp here and return
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to the caller without visiting any of the helpful code installed prior
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to this function. This should work ok, since a longjmp() out of here has
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to work if linux signal semantics are to be maintained. */
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SetThreadContext (GetCurrentThread (), in);
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return 0; /* Never actually returns. This is just to keep gcc happy. */
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}
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/* Utilities to call a user supplied exception handler. */
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