Hidden Debug Mode Found In AMD Processors(woodmann.com)
woodmann.com
Hidden Debug Mode Found In AMD Processors
http://www.woodmann.com/collaborative/knowledge/index.php/Super-secret_debug_capabilities_of_AMD_processors_!
5 comments
Also see http://news.ycombinator.com/item?id=1897583.
Google's cache has a forum thread on the site, which I suspect led to the creation of the page linked above (which isn't yet cached)
http://www.google.com/search?q=cache:www.woodmann.com/forum/...
http://www.google.com/search?q=cache:www.woodmann.com/forum/...
Anyone happen to know if this passes cleanly through AMD-V? There are a few really cool debugging facilities on modern x86 processors (e.g. branch-wise versus instruction-wise stepping) that aren't handled in any VM that I know of.
Probably slashdotted -- I get a database error.
Apparently, Slashdot reader TheRaven64 has read the story. He summarizes it:
http://hardware.slashdot.org/comments.pl?sid=1865066&cid...
(tldr: it's about DR0 working on more than one word)
http://hardware.slashdot.org/comments.pl?sid=1865066&cid...
(tldr: it's about DR0 working on more than one word)
Hah, I can't believe woodmann.com is still alive. I used to read through fravia's website's mirror there.
Downvoted? What's wrong with what I said? I appreciated that site.
Because it has nothing to do with the topic, and especially because it doesn't add anything to the discussion.
Well, fravia was a student of +ORC and a reverse engineer who put a lot of information out there about reverse engineering at a time when there wasn't a lot out there (i.e. 10+ years ago).
I guess he was just going for nostalgia, but I admit to being surprised that people are still mirroring that. I've only had to reverse a few things, but I have to say that that old information is still good, because it wasn't about specific technology, but it was a more general sort of reasoning backwards that allowed you to infer the inner workings of something by looking at it from the outside. Even when I'm not trying to reverse something, I find it useful: by reasoning about how things probably work internally, I can sometimes discover features that no one bothered to document or things like that.
I guess he was just going for nostalgia, but I admit to being surprised that people are still mirroring that. I've only had to reverse a few things, but I have to say that that old information is still good, because it wasn't about specific technology, but it was a more general sort of reasoning backwards that allowed you to infer the inner workings of something by looking at it from the outside. Even when I'm not trying to reverse something, I find it useful: by reasoning about how things probably work internally, I can sometimes discover features that no one bothered to document or things like that.