Re: NetBSD/usermode (Was: CVS commit: src)

[Joerg Sonnenberger <joerg%britannica.bec.de@localhost>]

On Sat, Dec 31, 2011 at 05:20:16PM +0000, David Holland wrote:
> The other obvious approach is to add one or more new ptrace operations
> to provide proper/adequate/better support for intercepting system
> calls. This is probably a more useful facility in the long run, and it
> *can* be made leakproof, but it'll be more work.

The missing piece is being able to modify the mapping of the debuggee.
Adding that is actually useful for a number of cases for a "normal"
debugger as well. Consider conditional break points. It would speed up
the processing a lot if a debugger could use JIT compilation and map the
conditional handling into the target process.

Joerg