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Hi,
 
I've had this problem show up in several 64 bit (ppc64) Linux versions 2.6.4
through 2.6.9.  When debugging a program compiled for 64 bits (gcc -m64)
The debugger is unable to display the contents of the fpscr register (info
reg fpscr, or info reg all).  Gdb says :
 
fpscr        reading register fpscr (#70) Input/output error.
 
This would just be irritating, except a program I'm trying to debug, an
infiniband verb layer app, fails to load in gdb with:
 
Error while reading shared library symbols:
reading register fpscr (#70); Input/output error.
 
The details of what I'm running are:
 
PowerMac G5
 
uname -a
Linux g5linux1 2.6.9.0-ydl.1.custom #1 SMP ppc64 ppc64 ppc64 GNU/Linux
 
gcc -v
gcc version 3.3.3
 
gdb -v
6.1.post-1.20040607.41rh
 
and the same results with:
6.2
 
This is repeatable with a simple hello world program.  Break in main, and do
info reg fpscr.
 
I haven't been able to find any reference to this problem anywhere else.
 
Anyone have any ideas?
 
Thanks!
 
Terry Reynolds
 
 

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<DIV><FONT face=Arial size=2><SPAN 
class=663160222-01112004>Hi,</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN 
class=663160222-01112004></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2><SPAN class=663160222-01112004>I've had this 
problem show up in several 64 bit (ppc64) Linux versions 2.6.4&nbsp;through 
2.6.9.&nbsp; When debugging a program compiled for 64 bits (gcc -m64)&nbsp; The 
debugger is unable to display the contents of the fpscr register (info reg 
fpscr, or info reg all).&nbsp; Gdb says :</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN 
class=663160222-01112004></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2><SPAN 
class=663160222-01112004>fpscr&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; reading 
register fpscr (#70) Input/output error.</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN 
class=663160222-01112004></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2><SPAN class=663160222-01112004>This would just be 
irritating, except a program I'm trying to debug, an infiniband verb layer app, 
fails to load in gdb with:</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN 
class=663160222-01112004></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2><SPAN class=663160222-01112004>Error while reading 
shared library symbols:</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN class=663160222-01112004>reading register 
fpscr (#70); Input/output error.</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN 
class=663160222-01112004></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2><SPAN class=663160222-01112004>The details of what 
I'm running are:</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN 
class=663160222-01112004></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2><SPAN class=663160222-01112004>PowerMac 
G5</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN 
class=663160222-01112004></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2><SPAN class=663160222-01112004>uname 
-a</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN class=663160222-01112004>Linux g5linux1 
2.6.9.0-ydl.1.custom #1 SMP ppc64 ppc64 ppc64 GNU/Linux</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN 
class=663160222-01112004></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2><SPAN class=663160222-01112004>gcc 
-v</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN class=663160222-01112004>gcc version 
3.3.3</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN 
class=663160222-01112004></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2><SPAN class=663160222-01112004>gdb 
-v</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN 
class=663160222-01112004>6.1.post-1.20040607.41rh</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN 
class=663160222-01112004></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2><SPAN class=663160222-01112004>and the same results 
with:</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN 
class=663160222-01112004>6.2</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN 
class=663160222-01112004></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2><SPAN class=663160222-01112004>This is repeatable 
with a simple hello world program.&nbsp; Break in main, and do info reg 
fpscr.</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN 
class=663160222-01112004></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2><SPAN class=663160222-01112004>I haven't been able 
to find any reference to this problem anywhere else.</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN 
class=663160222-01112004></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2><SPAN class=663160222-01112004>Anyone have any 
ideas?</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN 
class=663160222-01112004></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT><SPAN class=663160222-01112004></SPAN></FONT><FONT face=Arial 
size=2><SPAN class=663160222-01112004>Thanks!</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN 
class=663160222-01112004></SPAN></FONT>&nbsp;</DIV>
<DIV align=left><EM><FONT face=Script size=5>Terry Reynolds</FONT></EM></DIV>
<DIV align=left><FONT face=Arial size=2></FONT>&nbsp;</DIV>
<DIV>&nbsp;</DIV></BODY></HTML>

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