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Re: RFA PATCH: Enable MIPS SIGFPE handling...
Andrew Haley wrote:
> David Daney writes:
> > When I made my initial series of MIPS patches my misunderstanding of how
> > GCC generates divide by zero checks led me to omit SIGFPE handling.
> >
> > Now since I have seen the light, I present this patch to enable use of
> > SIGFPE for generation of ArithmeticException("/ by zero");
> >
> >
> > Tested on --host=i686-pc-linux-gnu --target=mipsel-linux with no
> > regressions in top level make check.
> >
> > And yes it is correct to #undef HANDLE_DIVIDE_OVERFLOW as MIPS does
> > division according to the JLS without any of the mickey-mouse stuff that
> > has to be done with the x86.
> >
> > O.K to commit?
> >
> > David Daney.
> > 2004-09-03 David Daney <ddaney@avtrex.com>
> >
> > * configure.host: Use -fno-use-divide-subroutine for mips*-*-linux*.
> > * include/mips-signal.h: Added HANDLE_FPE support.
>
> Where does the saved PC in the sigcontext point to when a divide
> overflow happens? The trap instruction, or the instruction after?
To the best of my knowledge, it points to the teq/break instruction.
David Daney.