diff options
Diffstat (limited to 'arch/m68k/lib/divsi3.S')
| -rw-r--r-- | arch/m68k/lib/divsi3.S | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/arch/m68k/lib/divsi3.S b/arch/m68k/lib/divsi3.S new file mode 100644 index 000000000000..ec307b61991e --- /dev/null +++ b/arch/m68k/lib/divsi3.S @@ -0,0 +1,125 @@ +/* libgcc1 routines for 68000 w/o floating-point hardware. + Copyright (C) 1994, 1996, 1997, 1998 Free Software Foundation, Inc. + +This file is part of GNU CC. + +GNU CC is free software; 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 2, or (at your option) any +later version. + +In addition to the permissions in the GNU General Public License, the +Free Software Foundation gives you unlimited permission to link the +compiled version of this file with other programs, and to distribute +those programs without any restriction coming from the use of this +file. (The General Public License restrictions do apply in other +respects; for example, they cover modification of the file, and +distribution when not linked into another program.) + +This file is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY 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; see the file COPYING. If not, write to +the Free Software Foundation, 59 Temple Place - Suite 330, +Boston, MA 02111-1307, USA. */ + +/* As a special exception, if you link this library with files + compiled with GCC to produce an executable, this does not cause + the resulting executable to be covered by the GNU General Public License. + This exception does not however invalidate any other reasons why + the executable file might be covered by the GNU General Public License. */ + +/* Use this one for any 680x0; assumes no floating point hardware. + The trailing " '" appearing on some lines is for ANSI preprocessors. Yuk. + Some of this code comes from MINIX, via the folks at ericsson. + D. V. Henkel-Wallace (gumby@cygnus.com) Fete Bastille, 1992 +*/ + +/* These are predefined by new versions of GNU cpp. */ + +#ifndef __USER_LABEL_PREFIX__ +#define __USER_LABEL_PREFIX__ _ +#endif + +#ifndef __REGISTER_PREFIX__ +#define __REGISTER_PREFIX__ +#endif + +#ifndef __IMMEDIATE_PREFIX__ +#define __IMMEDIATE_PREFIX__ # +#endif + +/* ANSI concatenation macros. */ + +#define CONCAT1(a, b) CONCAT2(a, b) +#define CONCAT2(a, b) a ## b + +/* Use the right prefix for global labels. */ + +#define SYM(x) CONCAT1 (__USER_LABEL_PREFIX__, x) + +/* Use the right prefix for registers. */ + +#define REG(x) CONCAT1 (__REGISTER_PREFIX__, x) + +/* Use the right prefix for immediate values. */ + +#define IMM(x) CONCAT1 (__IMMEDIATE_PREFIX__, x) + +#define d0 REG (d0) +#define d1 REG (d1) +#define d2 REG (d2) +#define d3 REG (d3) +#define d4 REG (d4) +#define d5 REG (d5) +#define d6 REG (d6) +#define d7 REG (d7) +#define a0 REG (a0) +#define a1 REG (a1) +#define a2 REG (a2) +#define a3 REG (a3) +#define a4 REG (a4) +#define a5 REG (a5) +#define a6 REG (a6) +#define fp REG (fp) +#define sp REG (sp) + + .text + .proc + .globl SYM (__divsi3) +SYM (__divsi3): + movel d2, sp@- + + moveq IMM (1), d2 /* sign of result stored in d2 (=1 or =-1) */ + movel sp@(12), d1 /* d1 = divisor */ + jpl L1 + negl d1 +#if !(defined(__mcf5200__) || defined(__mcoldfire__)) + negb d2 /* change sign because divisor <0 */ +#else + negl d2 /* change sign because divisor <0 */ +#endif +L1: movel sp@(8), d0 /* d0 = dividend */ + jpl L2 + negl d0 +#if !(defined(__mcf5200__) || defined(__mcoldfire__)) + negb d2 +#else + negl d2 +#endif + +L2: movel d1, sp@- + movel d0, sp@- + jbsr SYM (__udivsi3) /* divide abs(dividend) by abs(divisor) */ + addql IMM (8), sp + + tstb d2 + jpl L3 + negl d0 + +L3: movel sp@+, d2 + rts + |