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[Qemu-devel] Re: Another SIGFPE in display code, now in cirrus

From: Avi Kivity
Subject: [Qemu-devel] Re: Another SIGFPE in display code, now in cirrus
Date: Mon, 10 May 2010 10:41:53 +0300
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20100330 Fedora/3.0.4-1.fc12 Thunderbird/3.0.4

On 05/06/2010 11:07 PM, Michael Tokarev wrote:
There was a bug recently fixed in vnc code.  Apparently
there's something similar in the cirrus emulation as well.
Here it triggers _always_ (including old versions of kvm)
when running windows NT and hitting "test" button in its
display resolution dialog.  Here's what gdb is to say:

Program received signal SIGFPE, Arithmetic exception.
[Switching to Thread 0xf76cab70 (LWP 580)]
0x080c5e45 in cirrus_do_copy (s=0x86134dc, dst=960000, src=0, w=2, h=9)
    at hw/cirrus_vga.c:687
687        sx = (src % ABS(s->cirrus_blt_srcpitch)) / depth;
(gdb) p depth
$1 = 2
(gdb) p s->cirrus_blt_srcpitch
$2 = 0

This qemu-kvm-0.12.3 - actually a debian package of it,
but there's no patches relevant to video applied.

Anything can be done with it?

Well, it's trivial to check for the condition, but how to handle it?

Need to find the spec for the chip.

error compiling committee.c: too many arguments to function

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