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 <linux/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 | |