[Asterisk-Users] G.729a beta codec on old Pentiums

[andrewg at felinemenace.org]

On Sat, May 22, 2004 at 01:05:23PM +1000, Christopher Lee wrote:
> Hi Andrew,
> 
> Here's the results:-

Okay, doesn't mean so much to me, but it might help someone.

> 
> [snipped out most of the above symbols messages]
> Reading symbols from /usr/lib/asterisk/modules/format_g726.so...done.
> Loaded symbols for /usr/lib/asterisk/modules/format_g726.so
> Reading symbols from /usr/lib/asterisk/modules/format_g729.so...done.
> Loaded symbols for /usr/lib/asterisk/modules/format_g729.so
> Reading symbols from /usr/lib/asterisk/modules/codec_g729a.so...done.
> Loaded symbols for /usr/lib/asterisk/modules/codec_g729a.so
> #0  0x4044e862 in lsp_get_quant ()
>   from /usr/lib/asterisk/modules/codec_g729a.so
> (gdb) bt
> #0  0x4044e862 in lsp_get_quant ()
>   from /usr/lib/asterisk/modules/codec_g729a.so
> #1  0x00000000 in ?? ()
> (gdb) x/5i $eip
> 0x4044e862 <lsp_get_quant+210>: fcomi  %st(5),%st
> 0x4044e864 <lsp_get_quant+212>: jbe    0x4044eb40 <lsp_get_quant+944>
> 0x4044e86a <lsp_get_quant+218>: fsubr  %st,%st(2)
> 0x4044e86c <lsp_get_quant+220>: faddp  %st,%st(1)
> 0x4044e86e <lsp_get_quant+222>: fxch   %st(1)

prehaps try 

info registers st0 st1 st2 st3 st4 st5 st6 st7 as well, that said I'm not overly familar with those floating point instructions. 

http://nasm.sourceforge.net/doc/html/nasmdoc0.html

> (gdb) info registers
> eax            0x3      3
> ecx            0x3c     60
> edx            0x1      1
> ebx            0x15     21
> esp            0xbfffeef0       0xbfffeef0
> ebp            0xbfffef10       0xbfffef10
> esi            0x40459d40       1078304064
> edi            0x40458940       1078298944
> eip            0x4044e862       0x4044e862
> eflags         0x10202  66050
> cs             0x23     35
> ss             0x2b     43
> ds             0x2b     43
> es             0x2b     43
> fs             0x2b     43
> gs             0x2b     43
> fctrl          0x37f    895
> fstat          0x1132   4402
> ftag           0x400f   16399
> fiseg          0x23     35
> fioff          0x4044e860       1078257760
> foseg          0x2b     43
> fooff          0x0      0
> ---Type <return> to continue, or q <return> to quit---
> fop            0xcc     204
> mxcsr          0x1f80   8064
> orig_eax       0xffffffff       -1
> (gdb)
> 
> And re the F00F bug, yep I figured it was probably very unlikely to be the
> root cause of the problem, as I have noticed messages when linux boots that
> it implements a workaround for the bug, so if that's the case then I guess
> all should be fine.
> 
> Thanks,
> Chris Lee
> 
> -----Original Message-----
> From: asterisk-users-admin at lists.digium.com
> [mailto:asterisk-users-admin at lists.digium.com] On Behalf Of
> andrewg at felinemenace.org
> Sent: Saturday, 22 May 2004 12:46 PM
> To: asterisk-users at lists.digium.com
> Subject: Re: [Asterisk-Users] G.729a beta codec on old Pentiums
> 
> If you have gdb installed, try gdb /usr/sbin/asterisk (or whichever path is
> appropiate) name_of_core_file, and send back the results of 
> 
> bt
> x/5i $eip
> info registers 
> 
> and that should allow the developers or other people to work out what the
> problem is.
> 
> As for the f00f bug, its unlikely that would be causing problems, the
> mention of f00f is there so that you can check to see if the machine is
> vulnerable. From memory, most os's now include work arounds for that bug.
> 
> 
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