| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* libgcc1 routines for 68000 w/o floating-point hardware. |
| 2 | Copyright (C) 1994, 1996, 1997, 1998 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GNU CC. |
| 5 | |
| 6 | GNU CC is free software; you can redistribute it and/or modify it |
| 7 | under the terms of the GNU General Public License as published by the |
| 8 | Free Software Foundation; either version 2, or (at your option) any |
| 9 | later version. |
| 10 | |
| 11 | In addition to the permissions in the GNU General Public License, the |
| 12 | Free Software Foundation gives you unlimited permission to link the |
| 13 | compiled version of this file with other programs, and to distribute |
| 14 | those programs without any restriction coming from the use of this |
| 15 | file. (The General Public License restrictions do apply in other |
| 16 | respects; for example, they cover modification of the file, and |
| 17 | distribution when not linked into another program.) |
| 18 | |
| 19 | This file is distributed in the hope that it will be useful, but |
| 20 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 22 | General Public License for more details. |
| 23 | |
| 24 | You should have received a copy of the GNU General Public License |
| 25 | along with this program; see the file COPYING. If not, write to |
| 26 | the Free Software Foundation, 59 Temple Place - Suite 330, |
| 27 | Boston, 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 (__divsi3) |
| 93 | SYM (__divsi3): |
| 94 | movel d2, sp@- |
| 95 | |
| 96 | moveq IMM (1), d2 /* sign of result stored in d2 (=1 or =-1) */ |
| 97 | movel sp@(12), d1 /* d1 = divisor */ |
| 98 | jpl L1 |
| 99 | negl d1 |
| 100 | #if !(defined(__mcf5200__) || defined(__mcoldfire__)) |
| 101 | negb d2 /* change sign because divisor <0 */ |
| 102 | #else |
| 103 | negl d2 /* change sign because divisor <0 */ |
| 104 | #endif |
| 105 | L1: movel sp@(8), d0 /* d0 = dividend */ |
| 106 | jpl L2 |
| 107 | negl d0 |
| 108 | #if !(defined(__mcf5200__) || defined(__mcoldfire__)) |
| 109 | negb d2 |
| 110 | #else |
| 111 | negl d2 |
| 112 | #endif |
| 113 | |
| 114 | L2: movel d1, sp@- |
| 115 | movel d0, sp@- |
| 116 | jbsr SYM (__udivsi3) /* divide abs(dividend) by abs(divisor) */ |
| 117 | addql IMM (8), sp |
| 118 | |
| 119 | tstb d2 |
| 120 | jpl L3 |
| 121 | negl d0 |
| 122 | |
| 123 | L3: movel sp@+, d2 |
| 124 | rts |
| 125 | |