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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;
}