LXR linux/arch/m68k/lib/mulsi3.S

   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
  24/* As a special exception, if you link this library with files
  25   compiled with GCC to produce an executable, this does not cause
  26   the resulting executable to be covered by the GNU General Public License.
  27   This exception does not however invalidate any other reasons why
  28   the executable file might be covered by the GNU General Public License.  */
  29
  30/* Use this one for any 680x0; assumes no floating point hardware.
  31   The trailing " '" appearing on some lines is for ANSI preprocessors.  Yuk.
  32   Some of this code comes from MINIX, via the folks at ericsson.
  33   D. V. Henkel-Wallace (gumby@cygnus.com) Fete Bastille, 1992
  34*/
  35#include <asm/export.h>
  36/* These are predefined by new versions of GNU cpp.  */
  37
  38#ifndef __USER_LABEL_PREFIX__
  39#define __USER_LABEL_PREFIX__ _
  40#endif
  41
  42#ifndef __REGISTER_PREFIX__
  43#define __REGISTER_PREFIX__
  44#endif
  45
  46#ifndef __IMMEDIATE_PREFIX__
  47#define __IMMEDIATE_PREFIX__ #
  48#endif
  49
  50/* ANSI concatenation macros.  */
  51
  52#define CONCAT1(a, b) CONCAT2(a, b)
  53#define CONCAT2(a, b) a ## b
  54
  55/* Use the right prefix for global labels.  */
  56
  57#define SYM(x) CONCAT1 (__USER_LABEL_PREFIX__, x)
  58
  59/* Use the right prefix for registers.  */
  60
  61#define REG(x) CONCAT1 (__REGISTER_PREFIX__, x)
  62
  63/* Use the right prefix for immediate values.  */
  64
  65#define IMM(x) CONCAT1 (__IMMEDIATE_PREFIX__, x)
  66
  67#define d0 REG (d0)
  68#define d1 REG (d1)
  69#define d2 REG (d2)
  70#define d3 REG (d3)
  71#define d4 REG (d4)
  72#define d5 REG (d5)
  73#define d6 REG (d6)
  74#define d7 REG (d7)
  75#define a0 REG (a0)
  76#define a1 REG (a1)
  77#define a2 REG (a2)
  78#define a3 REG (a3)
  79#define a4 REG (a4)
  80#define a5 REG (a5)
  81#define a6 REG (a6)
  82#define fp REG (fp)
  83#define sp REG (sp)
  84
  85        .text
  86        .proc
  87        .globl  SYM (__mulsi3)
  88SYM (__mulsi3):
  89        movew   sp@(4), d0      /* x0 -> d0 */
  90        muluw   sp@(10), d0     /* x0*y1 */
  91        movew   sp@(6), d1      /* x1 -> d1 */
  92        muluw   sp@(8), d1      /* x1*y0 */
  93#if !(defined(__mcf5200__) || defined(__mcoldfire__))
  94        addw    d1, d0
  95#else
  96        addl    d1, d0
  97#endif
  98        swap    d0
  99        clrw    d0
 100        movew   sp@(6), d1      /* x1 -> d1 */
 101        muluw   sp@(10), d1     /* x1*y1 */
 102        addl    d1, d0
 103
 104        rts
 105        EXPORT_SYMBOL(__mulsi3)
 106