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 /* 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 36 #include <asm/export.h> 37 38 /* These are predefined by new versions of GNU cpp. */ 39 40 #ifndef __USER_LABEL_PREFIX__ 41 #define __USER_LABEL_PREFIX__ _ 42 #endif 43 44 #ifndef __REGISTER_PREFIX__ 45 #define __REGISTER_PREFIX__ 46 #endif 47 48 #ifndef __IMMEDIATE_PREFIX__ 49 #define __IMMEDIATE_PREFIX__ # 50 #endif 51 52 /* ANSI concatenation macros. */ 53 54 #define CONCAT1(a, b) CONCAT2(a, b) 55 #define CONCAT2(a, b) a ## b 56 57 /* Use the right prefix for global labels. */ 58 59 #define SYM(x) CONCAT1 (__USER_LABEL_PREFIX__, x) 60 61 /* Use the right prefix for registers. */ 62 63 #define REG(x) CONCAT1 (__REGISTER_PREFIX__, x) 64 65 /* Use the right prefix for immediate values. */ 66 67 #define IMM(x) CONCAT1 (__IMMEDIATE_PREFIX__, x) 68 69 #define d0 REG (d0) 70 #define d1 REG (d1) 71 #define d2 REG (d2) 72 #define d3 REG (d3) 73 #define d4 REG (d4) 74 #define d5 REG (d5) 75 #define d6 REG (d6) 76 #define d7 REG (d7) 77 #define a0 REG (a0) 78 #define a1 REG (a1) 79 #define a2 REG (a2) 80 #define a3 REG (a3) 81 #define a4 REG (a4) 82 #define a5 REG (a5) 83 #define a6 REG (a6) 84 #define fp REG (fp) 85 #define sp REG (sp) 86 87 .text 88 .proc 89 .globl SYM (__divsi3) 90 SYM (__divsi3): 91 movel d2, sp@- 92 93 moveq IMM (1), d2 /* sign of result stored in d2 (=1 or =-1) */ 94 movel sp@(12), d1 /* d1 = divisor */ 95 jpl L1 96 negl d1 97 #if !(defined(__mcf5200__) || defined(__mcoldfire__)) 98 negb d2 /* change sign because divisor <0 */ 99 #else 100 negl d2 /* change sign because divisor <0 */ 101 #endif 102 L1: movel sp@(8), d0 /* d0 = dividend */ 103 jpl L2 104 negl d0 105 #if !(defined(__mcf5200__) || defined(__mcoldfire__)) 106 negb d2 107 #else 108 negl d2 109 #endif 110 111 L2: movel d1, sp@- 112 movel d0, sp@- 113 jbsr SYM (__udivsi3) /* divide abs(dividend) by abs(divisor) */ 114 addql IMM (8), sp 115 116 tstb d2 117 jpl L3 118 negl d0 119 120 L3: movel sp@+, d2 121 rts 122 123 EXPORT_SYMBOL(__divsi3) 124