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/arch/m68knommu/lib/umodsi3.S

https://bitbucket.org/evzijst/gittest
Assembly | 113 lines | 106 code | 7 blank | 0 comment | 4 complexity | 8efc62083192f66c97941a96708c7cef MD5 | raw file
  1/* libgcc1 routines for 68000 w/o floating-point hardware.
  2   Copyright (C) 1994, 1996, 1997, 1998 Free Software Foundation, Inc.
  3
  4This file is part of GNU CC.
  5
  6GNU CC is free software; you can redistribute it and/or modify it
  7under the terms of the GNU General Public License as published by the
  8Free Software Foundation; either version 2, or (at your option) any
  9later version.
 10
 11In addition to the permissions in the GNU General Public License, the
 12Free Software Foundation gives you unlimited permission to link the
 13compiled version of this file with other programs, and to distribute
 14those programs without any restriction coming from the use of this
 15file.  (The General Public License restrictions do apply in other
 16respects; for example, they cover modification of the file, and
 17distribution when not linked into another program.)
 18
 19This file is distributed in the hope that it will be useful, but
 20WITHOUT ANY WARRANTY; without even the implied warranty of
 21MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 22General Public License for more details.
 23
 24You should have received a copy of the GNU General Public License
 25along with this program; see the file COPYING.  If not, write to
 26the Free Software Foundation, 59 Temple Place - Suite 330,
 27Boston, MA 02111-1307, USA.  */
 28
 29/* As a special exception, if you link this library with files
 30   compiled with GCC to produce an executable, this does not cause
 31   the resulting executable to be covered by the GNU General Public License.
 32   This exception does not however invalidate any other reasons why
 33   the executable file might be covered by the GNU General Public License.  */
 34
 35/* Use this one for any 680x0; assumes no floating point hardware.
 36   The trailing " '" appearing on some lines is for ANSI preprocessors.  Yuk.
 37   Some of this code comes from MINIX, via the folks at ericsson.
 38   D. V. Henkel-Wallace (gumby@cygnus.com) Fete Bastille, 1992
 39*/
 40
 41/* These are predefined by new versions of GNU cpp.  */
 42
 43#ifndef __USER_LABEL_PREFIX__
 44#define __USER_LABEL_PREFIX__ _
 45#endif
 46
 47#ifndef __REGISTER_PREFIX__
 48#define __REGISTER_PREFIX__
 49#endif
 50
 51#ifndef __IMMEDIATE_PREFIX__
 52#define __IMMEDIATE_PREFIX__ #
 53#endif
 54
 55/* ANSI concatenation macros.  */
 56
 57#define CONCAT1(a, b) CONCAT2(a, b)
 58#define CONCAT2(a, b) a ## b
 59
 60/* Use the right prefix for global labels.  */
 61
 62#define SYM(x) CONCAT1 (__USER_LABEL_PREFIX__, x)
 63
 64/* Use the right prefix for registers.  */
 65
 66#define REG(x) CONCAT1 (__REGISTER_PREFIX__, x)
 67
 68/* Use the right prefix for immediate values.  */
 69
 70#define IMM(x) CONCAT1 (__IMMEDIATE_PREFIX__, x)
 71
 72#define d0 REG (d0)
 73#define d1 REG (d1)
 74#define d2 REG (d2)
 75#define d3 REG (d3)
 76#define d4 REG (d4)
 77#define d5 REG (d5)
 78#define d6 REG (d6)
 79#define d7 REG (d7)
 80#define a0 REG (a0)
 81#define a1 REG (a1)
 82#define a2 REG (a2)
 83#define a3 REG (a3)
 84#define a4 REG (a4)
 85#define a5 REG (a5)
 86#define a6 REG (a6)
 87#define fp REG (fp)
 88#define sp REG (sp)
 89
 90	.text
 91	.proc
 92	.globl	SYM (__umodsi3)
 93SYM (__umodsi3):
 94	movel	sp@(8), d1	/* d1 = divisor */
 95	movel	sp@(4), d0	/* d0 = dividend */
 96	movel	d1, sp@-
 97	movel	d0, sp@-
 98	jbsr	SYM (__udivsi3)
 99	addql	IMM (8), sp
100	movel	sp@(8), d1	/* d1 = divisor */
101#if !(defined(__mcf5200__) || defined(__mcoldfire__))
102	movel	d1, sp@-
103	movel	d0, sp@-
104	jbsr	SYM (__mulsi3)	/* d0 = (a/b)*b */
105	addql	IMM (8), sp
106#else
107	mulsl	d1,d0
108#endif
109	movel	sp@(4), d1	/* d1 = dividend */
110	subl	d0, d1		/* d1 = a - (a/b)*b */
111	movel	d1, d0
112	rts
113