Re: Divide by Zero segment fault

[Andrew Haley <aph at redhat dot com>]

On 10/16/2012 10:58 PM, Deepthi Bokka wrote:

> I am new to this group and I am working on a project where I am
> porting the Diab build ECU software to GCC 3.4.4 version. This
> software actually works on MPC555 series of processor but I am
> removing all the hardware dependencies and creating the exe and dll
> so that it can run on Windows XP system. The dll will run on a
> proprietary tool to simulate the results.
> 
> But when I am running exe or dll, I am getting a segmentation fault
> because of divide by zero. To check for divide by zero in the
> software, code is very huge with many files and there are multiple
> places where this can occur. So checking for zero and skipping that
> is ruled out for my case.
> 
> But when the diab build software is running on MPC555 we are not
> getting this issue as there the compiler is handled differently. For
> example: x = a/b where b=0 then this is processed as x=0 rather than
> giving error. So something by zero is treated as simply zero.
> 
> I want similar functionality even in GCC build code, is there any
> option for doing this. I tried the flag -mno-check-zero-division in
> make file but I was getting make file error that this is not a valid
> flag. I tried using the signal handling "sigaction" but could not
> get the exact functionality as x/0 should be treated as 0.
> 
> Please can any one help me how to handle this scenario, I can
> upgrade the GCC compiler version if higher versions can handle this
> issue.

Someone could probably figure out how to write a signal handler that
would do what you want, but it would be tricky and nonportable and
probably is not a good idea in any case.  Any division by zero is
almost certainly a bug that you should fix, and I would urge you to do
so.

Andrew.