Date: Sat, 3 Jul 1999 09:43:37 -0400 (EDT) From: Brian Dean <brdean@unx.sas.com> To: freebsd-hackers@freebsd.org Subject: support for i386 hardware debug watch points Message-ID: <199907031343.JAA13822@dean.pc.sas.com>
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Hi, After recently debugging a very elusive memory overwrite problem that I was only able to find by setting up a debugger watch point, and suffering through the slowness that this introduced, I began reading up on the ix86 support for hardware watch points. Using this facility of the chip would require OS support, and specifically, loading the debug registers at context switch time. Also, the 'ptrace' system call could easily be extended to provide an interface for doing this from user code. Is there any interest in supporting something like this in FreeBSD? I'm volunteering to spend some cycles on this, but I don't want to go to the effort if there's little chance that the work would be integrated. Thanks, -Brian -- Brian Dean SAS Institute Inc brdean@unx.sas.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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