From: Andreas Schwab <schwab@linux-m68k.org>
To: Matthias Reis <matthias.reis@hu-berlin.de>
Cc: linux-m68k@lists.linux-m68k.org
Subject: Re: Crash in entry.S:resume on Atari ST
Date: Fri, 16 Sep 2016 11:29:38 +0200 [thread overview]
Message-ID: <87r38kxke5.fsf@linux-m68k.org> (raw)
In-Reply-To: <8132f924080d98f2bbe149d35352507d@hu-berlin.de> (Matthias Reis's message of "Fri, 16 Sep 2016 00:35:53 +0200")
On Sep 16 2016, Matthias Reis <matthias.reis@hu-berlin.de> wrote:
> === objdump -D vmlinux output:
> 000048cc <resume>:
> 48cc: 2208 movel %a0,%d1
> 48ce: 40e8 0320 movew %sr,%a0@(800)
> 48d2: 48e7 031e moveml %d6-%d7/%a3-%fp,%sp@-
> 48d6: 214f 0318 movel %sp,%a0@(792)
> 48da: 4e6b movel %usp,%a3
> 48dc: 214b 031c movel %a3,%a0@(796)
> 48e0: 2669 031c moveal %a1@(796),%a3
> 48e4: 4e63 movel %a3,%usp
> 48e6: 2e69 0318 moveal %a1@(792),%sp
> 48ea: 4cdf 78c0 moveml %sp@+,%d6-%d7/%a3-%fp
> 48ee: 46e9 0320 movew %a1@(800),%sr
> 48f2: 4e75 rtsp
> ===
>
> It can be seen from the register dump given by the hatari debugger, that
> USP contains 0x0 and the superuser bit (indicated by "S=0") is not set:
SR should never contain S=0 at this point, as returning from kernel
context always happens with RTE (via resume_userspace).
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
next prev parent reply other threads:[~2016-09-16 9:29 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-15 22:35 Crash in entry.S:resume on Atari ST Matthias Reis
2016-09-16 6:39 ` Greg Ungerer
2016-09-16 13:53 ` Matthias Reis
2016-09-16 9:29 ` Andreas Schwab [this message]
2016-09-16 14:23 ` Andreas Schwab
2016-09-16 14:47 ` Matthias Reis
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