1/*
2 * File:         arch/blackfin/lib/modsi3.S
3 * Based on:
4 * Author:
5 *
6 * Created:
7 * Description:  This program computes 32 bit signed remainder. It calls div32 function
8 *               for quotient estimation.
9 *
10 *               Registers used :
11 *               Numerator/ Denominator in  R0, R1
12 *                 R0  -  returns remainder.
13 *                 R2-R7
14 *
15 * Modified:
16 *               Copyright 2004-2006 Analog Devices Inc.
17 *
18 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
19 *
20 * This program is free software; you can redistribute it and/or modify
21 * it under the terms of the GNU General Public License as published by
22 * the Free Software Foundation; either version 2 of the License, or
23 * (at your option) any later version.
24 *
25 * This program is distributed in the hope that it will be useful,
26 * but WITHOUT ANY WARRANTY; without even the implied warranty of
27 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
28 * GNU General Public License for more details.
29 *
30 * You should have received a copy of the GNU General Public License
31 * along with this program; if not, see the file COPYING, or write
32 * to the Free Software Foundation, Inc.,
33 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
34 */
35
36.global ___modsi3;
37.type ___modsi3, STT_FUNC;
38.extern ___divsi3;
39.type ___divsi3, STT_FUNC;
40
41#ifdef CONFIG_ARITHMETIC_OPS_L1
42.section .l1.text
43#else
44.text
45#endif
46
47___modsi3:
48
49	CC=R0==0;
50	IF CC JUMP .LRETURN_R0;		/* Return 0, if numerator  == 0 */
51	CC=R1==0;
52	IF CC JUMP .LRETURN_ZERO;		/* Return 0, if denominator == 0 */
53	CC=R0==R1;
54	IF CC JUMP .LRETURN_ZERO;		/* Return 0, if numerator == denominator */
55	CC = R1 == 1;
56	IF CC JUMP .LRETURN_ZERO;		/* Return 0, if denominator ==  1 */
57	CC = R1 == -1;
58	IF CC JUMP .LRETURN_ZERO;		/* Return 0, if denominator == -1 */
59
60	/* Valid input. Use __divsi3() to compute the quotient, and then
61	 * derive the remainder from that. */
62
63	[--SP] = (R7:6);		/* Push  R7 and R6 */
64	[--SP] = RETS;			/* and return address */
65	R7 = R0;			/* Copy of R0 */
66	R6 = R1;			/* Save for later */
67	SP += -12;			/* Should always provide this space */
68	CALL ___divsi3;			/* Compute signed quotient using ___divsi3()*/
69	SP += 12;
70	R0 *= R6;			/* Quotient * divisor */
71	R0 = R7 - R0;			/* Dividend - (quotient * divisor) */
72	RETS = [SP++];			/* Get back return address */
73	(R7:6) = [SP++];		/* Pop registers R7 and R4 */
74	RTS;				/* Store remainder    */
75
76.LRETURN_ZERO:
77	R0 = 0;
78.LRETURN_R0:
79	RTS;
80
81.size ___modsi3, .-___modsi3
82