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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/m68k/lib/umodsi3.S
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/* libgcc1 routines for 68000 w/o floating-point hardware.

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   Copyright (C) 1994, 1996, 1997, 1998 Free Software Foundation, Inc.

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This file is part of GNU CC.

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GNU CC is free software; you can redistribute it and/or modify it

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under the terms of the GNU General Public License as published by the

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Free Software Foundation; either version 2, or (at your option) any

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later version.

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In addition to the permissions in the GNU General Public License, the

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Free Software Foundation gives you unlimited permission to link the

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compiled version of this file with other programs, and to distribute

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those programs without any restriction coming from the use of this

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file.  (The General Public License restrictions do apply in other

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respects; for example, they cover modification of the file, and

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distribution when not linked into another program.)

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This file is distributed in the hope that it will be useful, but

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WITHOUT ANY WARRANTY; without even the implied warranty of

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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

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General Public License for more details. */

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/* As a special exception, if you link this library with files

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   compiled with GCC to produce an executable, this does not cause

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   the resulting executable to be covered by the GNU General Public License.

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   This exception does not however invalidate any other reasons why

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   the executable file might be covered by the GNU General Public License.  */

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/* Use this one for any 680x0; assumes no floating point hardware.

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   The trailing " '" appearing on some lines is for ANSI preprocessors.  Yuk.

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   Some of this code comes from MINIX, via the folks at ericsson.

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   D. V. Henkel-Wallace ([email protected]) Fete Bastille, 1992

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*/

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#include <linux/export.h>

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/* These are predefined by new versions of GNU cpp.  */

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#ifndef __USER_LABEL_PREFIX__

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#define __USER_LABEL_PREFIX__ _

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#endif

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#ifndef __REGISTER_PREFIX__

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#define __REGISTER_PREFIX__

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#endif

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#ifndef __IMMEDIATE_PREFIX__

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#define __IMMEDIATE_PREFIX__ #

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#endif

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/* ANSI concatenation macros.  */

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#define CONCAT1(a, b) CONCAT2(a, b)

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#define CONCAT2(a, b) a ## b

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/* Use the right prefix for global labels.  */

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#define SYM(x) CONCAT1 (__USER_LABEL_PREFIX__, x)

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/* Use the right prefix for registers.  */

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#define REG(x) CONCAT1 (__REGISTER_PREFIX__, x)

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/* Use the right prefix for immediate values.  */

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#define IMM(x) CONCAT1 (__IMMEDIATE_PREFIX__, x)

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#define d0 REG (d0)

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#define d1 REG (d1)

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#define d2 REG (d2)

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#define d3 REG (d3)

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#define d4 REG (d4)

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#define d5 REG (d5)

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#define d6 REG (d6)

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#define d7 REG (d7)

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#define a0 REG (a0)

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#define a1 REG (a1)

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#define a2 REG (a2)

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#define a3 REG (a3)

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#define a4 REG (a4)

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#define a5 REG (a5)

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#define a6 REG (a6)

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#define fp REG (fp)

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#define sp REG (sp)

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	.text

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	.proc

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	.globl	SYM (__umodsi3)

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SYM (__umodsi3):

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	movel	sp@(8), d1	/* d1 = divisor */

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	movel	sp@(4), d0	/* d0 = dividend */

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	movel	d1, sp@-

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	movel	d0, sp@-

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	jbsr	SYM (__udivsi3)

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	addql	IMM (8), sp

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	movel	sp@(8), d1	/* d1 = divisor */

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#if !(defined(__mcf5200__) || defined(__mcoldfire__))

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	movel	d1, sp@-

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	movel	d0, sp@-

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	jbsr	SYM (__mulsi3)	/* d0 = (a/b)*b */

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	addql	IMM (8), sp

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#else

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	mulsl	d1,d0

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#endif

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	movel	sp@(4), d1	/* d1 = dividend */

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	subl	d0, d1		/* d1 = a - (a/b)*b */

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	movel	d1, d0

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	rts

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	EXPORT_SYMBOL(__umodsi3)

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