c67d07416a
list of frame sniffers so that trapframes can be detected. The kluge is needed because this version of gdb only supports appending a sniffer to the list of sniffers and the moment kgdb gets a chance to add its own frame sniffer, the target's default frame sniffer is already in the list. Since the default frame sniffer claims any frame thrown at it, kgdb's frame sniffer never gets to smell (a process much akin to tasting, but with lesser chance of hurling :-) This commit adds dummy frame sniffers that never claim a frame and as such don't fix anything yet. However, we now have frame sniffers and they are being called, so it's just a matter of adding meat to the bones and we'll be able to properly unwind across trapframes. MFC after: 1 week
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