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Re: [PATCH] kernelsp on 64-bit kernel

To: "Kevin D. Kissell" <kevink@mips.com>
Subject: Re: [PATCH] kernelsp on 64-bit kernel
From: "Kip Walker" <kwalker@broadcom.com>
Date: Tue, 04 Mar 2003 15:16:45 -0800
Cc: linux-mips@linux-mips.org, "Ralf Baechle" <ralf@linux-mips.org>
Organization: Broadcom Corp. BPBU
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <3E651FB7.A38AFD3B@broadcom.com> <01e401c2e2a2$f1866010$10eca8c0@grendel>
Sender: linux-mips-bounce@linux-mips.org
> For whatever it's worth, I've always maintained that stealing the Watchpoint
> registers in this way was a pretty questionable hack to be avoided.  
> Watchpoint
> registers are *optional* in MIPS64 and may not even exist.  And yes, someone
> might want to use them for their intended purpose some day.  However, please
> note that the EJTAG breakpoint registers are completely orthogonal to the
> watchpoint registers.

That is true, but in SB1, watchpoint registers can be used by the JTAG
debugger, and I do it all the time.  It doesn't have the EJTAG
breakpoint registers, but rather overloads (I know, I know) use of the
watchpoint registers and has a mode bit for causing a debug exception
instead of a general exception when they are tripped.

Kip


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