projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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 ([email protected]) 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 |