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////////////////////////////////////////////////////////////////////////////////

//

// Filename:    umod.c

//

// Project:     OpenArty, an entirely open SoC based upon the Arty platform

//

// Purpose:     This is a temporary file--a crutch if you will--until a similar

//              capability is merged into GCC.  Right now, GCC has no way of

//      taking the module of two 64-bit numbers, and this routine provides that

//      capability.

//

//      This routine is required by and used by newlib's printf in order to

//      print decimal numbers (%d) to an IO stream.

//

//      Once gcc is properly patched, this will be removed from the 

//      repository.

//

// Creator:     Dan Gisselquist, Ph.D.

//              Gisselquist Technology, LLC

//

////////////////////////////////////////////////////////////////////////////////

//

// Copyright (C) 2017, Gisselquist Technology, LLC

//

// This program is free software (firmware): you can redistribute it and/or

// modify it under the terms of  the GNU General Public License as published

// by the Free Software Foundation, either version 3 of the License, or (at

// your option) any later version.

//

// This program is distributed in the hope that it will be useful, but WITHOUT

// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for more details.

//

// You should have received a copy of the GNU General Public License along

// with this program.  (It's in the $(ROOT)/doc directory, run make with no

// target there if the PDF file isn't present.)  If not, see

// <http://www.gnu.org/licenses/> for a copy.

//

// License:     GPL, v3, as defined and found on www.gnu.org,

//              http://www.gnu.org/licenses/gpl.html

//

//

////////////////////////////////////////////////////////////////////////////////

//

//

#include <stdint.h>

unsigned long __udivdi3(unsigned long, unsigned long);

__attribute((noinline))

unsigned long __umoddi3(unsigned long a, unsigned long b) {

        unsigned long   r;

        // Return a modulo b, or a%b in C syntax

        r = __udivdi3(a, b);

        r = r * b;

        r = a - r;

        return r;

}