From: David Gibson <david@gibson.dropbear.id.au>
To: Alexey Kardashevskiy <aik@ozlabs.ru>
Cc: armbru@redhat.com, qemu-ppc@nongnu.org, qemu-devel@nongnu.org,
Suraj Jitindar Singh <sjitindarsingh@gmail.com>,
dgilbert@redhat.com
Subject: Re: [Qemu-devel] [PATCH 2/2] ppc: Add dump-stack implementation
Date: Mon, 6 May 2019 13:39:29 +1000 [thread overview]
Message-ID: <20190506033929.GE6790@umbus.fritz.box> (raw)
In-Reply-To: <c0917aef-79cc-f42c-2f4c-6d26da9657d6@ozlabs.ru>
[-- Attachment #1: Type: text/plain, Size: 1639 bytes --]
On Thu, May 02, 2019 at 01:47:32PM +1000, Alexey Kardashevskiy wrote:
>
>
> On 02/05/2019 10:43, David Gibson wrote:
> > On Wed, May 01, 2019 at 07:48:48PM +1000, Alexey Kardashevskiy wrote:
> >>
> >>
> >> On 01/05/2019 15:35, Suraj Jitindar Singh wrote:
> >>> The monitor function dump-stack is used to dump the stack for a cpu.
> >>> This can be useful for debugging purposes when the stack cannot be
> >>> dumped by another means.
> >>>
> >>> Add a ppc implementation ppc_cpu_dump_stack().
> >>> The stack pointer is stored in R1 with the back pointer at offset 0 and
> >>> the link register at offset 2.
> >>> Also dump the registers from the stack frame if the marker "regshere" is
> >>> found.
> >>
> >> Is this a Linux only marker? ABI does not mentioned this.
> >>
> >>> This only dumps the kernel stack, stopping if a non-kernel address is
> >>> found in the stack.
> >>
> >> Why enforce this limit?
> >
> > It's also making a Linux specific assumption about addresses.
>
> It does not have to if it used ppc_cpu_get_phys_page_debug(), the only
> linux specific left is that "regshere" marker, otherwise it could work
> for AIX or FreeBSD (obviously without the exception frame).
Sorry, I thought this was relying on the fact that Linux put its
linear mapping at 0xc0..., but I realized I was misreading what was
just the masking of the top two real mode address bits which is in the
hardware.
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]
next prev parent reply other threads:[~2019-05-06 3:53 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-01 5:35 [Qemu-devel] [PATCH 1/2] monitor: Add dump-stack command Suraj Jitindar Singh
2019-05-01 5:35 ` Suraj Jitindar Singh
2019-05-01 5:35 ` [Qemu-devel] [PATCH 2/2] ppc: Add dump-stack implementation Suraj Jitindar Singh
2019-05-01 5:35 ` Suraj Jitindar Singh
2019-05-01 9:48 ` Alexey Kardashevskiy
2019-05-01 9:48 ` Alexey Kardashevskiy
2019-05-02 0:43 ` David Gibson
2019-05-02 0:43 ` David Gibson
2019-05-02 3:47 ` Alexey Kardashevskiy
2019-05-02 3:47 ` Alexey Kardashevskiy
2019-05-06 3:39 ` David Gibson [this message]
2019-05-02 13:59 ` [Qemu-devel] [Qemu-ppc] " Greg Kurz
2019-05-02 13:59 ` Greg Kurz
2019-05-07 11:24 ` [Qemu-devel] " Markus Armbruster
2019-05-01 10:44 ` [Qemu-devel] [PATCH 1/2] monitor: Add dump-stack command Dr. David Alan Gilbert
2019-05-01 10:44 ` Dr. David Alan Gilbert
2019-05-02 0:44 ` David Gibson
2019-05-02 0:44 ` David Gibson
2019-05-02 2:15 ` [Qemu-devel] [Qemu-ppc] " Alexey Kardashevskiy
2019-05-02 2:15 ` Alexey Kardashevskiy
2019-05-07 11:21 ` Markus Armbruster
2019-05-07 11:09 ` [Qemu-devel] " Markus Armbruster
2019-05-08 10:26 ` Dr. David Alan Gilbert
2019-05-08 13:10 ` Markus Armbruster
2019-05-08 13:15 ` Dr. David Alan Gilbert
2019-06-21 0:51 ` Suraj Jitindar Singh
2019-06-24 8:57 ` Markus Armbruster
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190506033929.GE6790@umbus.fritz.box \
--to=david@gibson.dropbear.id.au \
--cc=aik@ozlabs.ru \
--cc=armbru@redhat.com \
--cc=dgilbert@redhat.com \
--cc=qemu-devel@nongnu.org \
--cc=qemu-ppc@nongnu.org \
--cc=sjitindarsingh@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).