Re: loader: Build the preloader for ARM

[Peter Rosin]

Den 2011-02-04 20:36 skrev Peter Rosin:
> Den 2011-02-04 17:41 skrev André Hentschel:
> > % and / both lead to external dependencies here...
> > maybe the euclidean algorithm helps, because -Os would need ugly changes to configure i guess.
>
> Finding gcd is a bit over the top...
>
> How about something like the following?
>
> Cheers,
> Peter
>
> unsigned int wld_modulo( const unsigned int a, const Elf32_Word b )
> {
> #ifdef __ARM_EABI__
>    unsigned int r = 0;
>    int i;
>
> for (i = sizeof(a) * 8 - 1; i >= 0; --i) {
>    	r <<= 1;
>    	if (a & (1U << i))
>    		r |= 1;
>    	if (r > b)

Ooops, bug. Should be "if (r >= b)"
> 	r -= b;
>
> }
>
> return r;
> ...

Cheers,
Peter