How do I write x86 Debug registers from user space on OSX?

Posted by nall on Stack Overflow See other posts from Stack Overflow or by nall
Published on 2010-04-09T00:50:29Z Indexed on 2010/04/09 0:53 UTC
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osx

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kernel

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syscall

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debug

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msr

I'd like to play around with the debug MSRs defined in the x86 spec (DR0-7) from my OSX user-space program. Unfortunately, these require CPL == 0 (aka ring 0). I've thumbed through the OSX syscalls and with the exception of kernel_debug nothing really jumps out as a way to access these.

It may be the case that they are only available via some higher level interface like kernel_debug, but it's unclear to me if that's the case or if I just haven't found the magic invocation to get to them.

Anyone know how to do this?

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