RE: [linuxsh-dev] Re: Floating point problem

[Bao C. H. <ba...@se...>]

(gdb) n
14              printf("\n status=%x\n", (int)status);
(gdb) set archi sh4
The target architecture is assumed to be sh4
(gdb) p/x $fpscr
$2 = 0x3f737871
(gdb) n

 status=%x

 dum=%f
......
CRASHED!!!

So it is the wrong FPU mode.  How do we fix it?

Thanks.
Bao

> -----Original Message-----
> From: lin...@li...
> [mailto:lin...@li...]On Behalf Of 
> kaz Kojima
> Sent: Wednesday, August 15, 2001 8:04 PM
> To: lin...@li...
> Subject: [linuxsh-dev] Re: Floating point problem
> 
> 
> "Bao C. Ha" <ba...@se...> wrote:
> > -static works
> > -O2 does not work (crash!)
> > 
> > Following is a gdb session when it crashes.  Note the
> > "correct" values of dum = -0.95105654 and status = 1!
> > 
> > Breakpoint 1, main () at test.c:13
> > 13              status = fscanf(fptr,"%f", &dum);
> > (gdb) n
> > 14              printf("\n status=%x\n", (int)status);
> > (gdb) print dum
> > $3 = -0.95105654
> > (gdb) print status
> > $4 = 1
> 
> Can you please check the result of the following gdb commands at this
> point?
> 
>   (gdb) set archi sh4
>   (gdb) p/x $fpscr
> 
> If you don't get 0x8xxxx as the value of fpscr register, the cause of
> the crash will be the wrong mode of FPU.
> 
> 	kaz
> 
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