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Re: corrected: tapset/script information template
- From: Ananth N Mavinakayanahalli <amavin at redhat dot com>
- To: Vara Prasad <prasadav at us dot ibm dot com>
- Cc: William Cohen <wcohen at redhat dot com>, "Frank Ch. Eigler" <fche at redhat dot com>, systemtap at sources dot redhat dot com
- Date: Tue, 03 May 2005 08:49:06 -0400
- Subject: Re: corrected: tapset/script information template
- References: <20050415005409.GD29851@redhat.com> <427289E4.9040801@redhat.com> <4272AF92.8070906@us.ibm.com>
Vara Prasad wrote:
Hi Will,
Thanks for taking care of this. This is an excellent start for function
tracing.
I am sure this feature will make many kernel developers happy.
Ananth, can you check to see if this approach works on PPC platform.
PowerPC (POWER4 and above) have hardware support only for data address
breakproints (they have one Data Address Breakpoint Register - DABR). If
we are talking of using debug hadware to track text addresses, then, no
PPC doesn't provide a facility for us to use.
IIUC, the PPC designers discontinued IABR (Instruction Address
Breakpoint Register) since they thought all breakpoints on a text
address can be handled in software.
Thanks,
Ananth