From: Pedro Alves <palves@redhat.com>
To: Ulrich Weigand <uweigand@de.ibm.com>
Cc: Tom Tromey <tom@tromey.com>, gdb-patches@sourceware.org
Subject: Re: [PATCH] Fix Cell debugging regression (Re: [PATCH] Use thread_info and inferior pointers more throughout)
Date: Wed, 27 Jun 2018 13:17:00 -0000 [thread overview]
Message-ID: <393b6452-79f3-4b87-d9e2-15fbe2125dc8@redhat.com> (raw)
In-Reply-To: <20180627131239.5F0D5D801C0@oc3748833570.ibm.com>
On 06/27/2018 02:12 PM, Ulrich Weigand wrote:
> Pedro Alves wrote:
>
>>> The change above switches the behavior to use the SPU architecture
>>> if GDB happens to interrupt SPU code. This is wrong and causes
>>> internal GDB errors pretty much instantly when starting an SPU ...
>> Sorry, missed that. Some comments here would be helpful.
>
> Agreed. :-)
>
>> gdb/ChangeLog:
>> 2018-06-27 Pedro Alves <palves@redhat.com>
>>
>> * proc-service.c (ps_lgetregs, ps_lsetregs, ps_lgetfpregs)
>> (ps_lsetfpregs): Use get_thread_main_regcache.
>> * regcache.c (get_thread_main_regcache): Define.
>> * regcache.h (get_thread_main_regcache): Declare.
>
> This looks good to me as far as the architecture is concerned.
>
> In the meantime I also noticed another potential issue (which is
> not related to multi-arch at all):
>
>> ps_err_e
>> ps_lgetregs (struct ps_prochandle *ph, lwpid_t lwpid, prgregset_t gregset)
>> {
>> - ptid_t ptid = ptid_build (ptid_get_pid (ph->ptid), lwpid, 0);
>> - struct regcache *regcache
>> - = get_thread_arch_regcache (ptid, target_gdbarch ());
>> + struct regcache *regcache = get_thread_regcache (ph->thread);
>
> This change also assumes that ph->thread is the same thread
> as the one indicated by lwpid. Looking at the callers of the
> various libthread_db routines that might result in a callback
> to the ps_...regs routines, it is not immediately obvious to
> me that this is actually true. Are you sure this can never
> be called to look up registers of another thread?
Argh, no, I completely missed that. Let me take a better look.
Thanks,
Pedro Alves
next prev parent reply other threads:[~2018-06-27 13:17 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-07 18:07 [PATCH] Use thread_info and inferior pointers more throughout Pedro Alves
2018-06-07 18:28 ` Tom Tromey
2018-06-21 15:57 ` Pedro Alves
2018-06-21 16:21 ` Pedro Alves
2018-06-25 10:18 ` Ulrich Weigand
2018-06-25 10:23 ` Pedro Alves
2018-06-27 11:34 ` Ulrich Weigand
2018-06-27 12:43 ` [PATCH] Fix Cell debugging regression (Re: [PATCH] Use thread_info and inferior pointers more throughout) Pedro Alves
2018-06-27 13:12 ` Ulrich Weigand
2018-06-27 13:17 ` Pedro Alves [this message]
2018-06-27 15:30 ` [PATCH v2] " Pedro Alves
2018-06-27 16:05 ` Ulrich Weigand
2018-06-27 16:25 ` Pedro Alves
2019-02-14 15:45 ` [PATCH] Use thread_info and inferior pointers more throughout Thomas Schwinge
2018-06-27 18:16 ` Possible regression on gdb.multi/multi-arch-exec.exp (was: Re: [PATCH] Use thread_info and inferior pointers more throughout) Sergio Durigan Junior
2018-06-27 18:39 ` Keith Seitz
2018-06-28 12:09 ` Possible regression on gdb.multi/multi-arch-exec.exp Pedro Alves
2018-06-28 16:02 ` [pushed] Fix follow-exec regression / crash (Re: Possible regression on gdb.multi/multi-arch-exec.exp) Pedro Alves
2018-06-28 16:37 ` Sergio Durigan Junior
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=393b6452-79f3-4b87-d9e2-15fbe2125dc8@redhat.com \
--to=palves@redhat.com \
--cc=gdb-patches@sourceware.org \
--cc=tom@tromey.com \
--cc=uweigand@de.ibm.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 read-only IMAP folder(s) and NNTP newsgroup(s).