RE: Re: Managing accidental read/writes to address zero
alex shulman <[email protected]>
| Newsgroups | gmane.comp.hardware.motorola.microcontrollers |
|---|---|
| Message-ID | <[email protected]> |
You could just put a branch instruction to your error handler or to reset vector (0x100) at address 0, or put litteraly 0 there. If the processor fetches 0 it gets unimlemented instruction exception at address 0x1000. You may write your Null pointer error handler code there as a part of the unimplemented instruction handler. Alex. --- Jean-Christophe MATHAE <[email protected]> wrote: > I was thinking of something like > #define NULL 0xF0000000 > were an access to this address will trigger a bus > error exception. > > It is not an easy solution, as this would probably > need to recompile the > libraries... And perhaps trigger all sorts of > strange errors where it is > assumed that "NULL == 0" is true .... > > > __________________________________ Yahoo! Mail Mobile Take Yahoo! Mail with you! Check email on your mobile phone. http://mobile.yahoo.com/learn/mail ----------------------------------------------------------- To learn more about Freescale Microcontrollers, please visit http://www.freescale.com/mcu Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/MPC500/ <*> To unsubscribe from this group, send an email to: [email protected] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/