From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: David Daney <ddaney@avtrex.com>
Cc: gdb@sourceware.org, linuxppc-embedded@ozlabs.org,
Matt Mackall <mpm@selenic.com>
Subject: Re: Apparent kernel bug with GDB on ppc405
Date: Fri, 26 Oct 2007 11:52:10 +1000 [thread overview]
Message-ID: <1193363530.7018.42.camel@pasglop> (raw)
In-Reply-To: <471FAC48.1070008@avtrex.com>
On Wed, 2007-10-24 at 13:34 -0700, David Daney wrote:
> First of all I have never used a similar configuration so this may be
> totally off base. But...
>
> If the icache is virtually indexed, then I think there are only two
> ways
> to invalidate it. The first is from the context of the debugged
> process
> where the page is mapped at the location the target program will see
> it.
> If you try to invalidate from the context of the debugger, the
> page
> will most likely not be mapped at the virtual address of the target
> program so you might have to invalidate the *entire* icache.
Yup, sounds likely. We don't handle that virtual icache well at all in
linux. Things tend to work by mere luck. I have various ideas to fix
that but haven't actually implemented them.
Ben.
next prev parent reply other threads:[~2007-10-26 1:52 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-24 19:46 Apparent kernel bug with GDB on ppc405 Matt Mackall
2007-10-24 20:28 ` Grant Likely
2007-10-24 20:42 ` Matt Mackall
2007-10-24 20:46 ` Grant Likely
2007-10-24 21:54 ` Matt Mackall
2007-10-24 22:27 ` Grant Likely
2007-10-24 22:32 ` Matt Mackall
2007-10-24 22:39 ` Grant Likely
2007-10-24 22:40 ` Grant Likely
2007-10-26 1:50 ` Benjamin Herrenschmidt
2007-10-24 22:41 ` Daniel Jacobowitz
2007-10-26 1:51 ` Benjamin Herrenschmidt
2007-10-26 20:41 ` Josh Boyer
2007-10-27 1:36 ` Benjamin Herrenschmidt
2007-10-27 1:27 ` Josh Boyer
2007-10-24 20:34 ` David Daney
2007-10-26 1:52 ` Benjamin Herrenschmidt [this message]
2007-10-26 1:46 ` Benjamin Herrenschmidt
2007-10-26 2:45 ` Grant Likely
2007-10-26 3:23 ` Benjamin Herrenschmidt
2007-10-26 14:41 ` Matt Mackall
2007-10-27 1:30 ` Benjamin Herrenschmidt
2007-10-27 7:32 ` [PATCH/RFC] powerpc: Pass PID argument to _tlbie (WAS: Apparent kernel bug with GDB on ppc405) Benjamin Herrenschmidt
2007-10-29 12:08 ` Josh Boyer
2007-10-29 20:15 ` Josh Boyer
2007-10-29 20:35 ` Benjamin Herrenschmidt
2007-10-29 21:13 ` Matt Mackall
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