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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 | |
d6410efa | 22 | General Public License for more details. */ |
1da177e4 LT |
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 | /* These are predefined by new versions of GNU cpp. */ | |
37 | ||
38 | #ifndef __USER_LABEL_PREFIX__ | |
39 | #define __USER_LABEL_PREFIX__ _ | |
40 | #endif | |
41 | ||
42 | #ifndef __REGISTER_PREFIX__ | |
43 | #define __REGISTER_PREFIX__ | |
44 | #endif | |
45 | ||
46 | #ifndef __IMMEDIATE_PREFIX__ | |
47 | #define __IMMEDIATE_PREFIX__ # | |
48 | #endif | |
49 | ||
50 | /* ANSI concatenation macros. */ | |
51 | ||
52 | #define CONCAT1(a, b) CONCAT2(a, b) | |
53 | #define CONCAT2(a, b) a ## b | |
54 | ||
55 | /* Use the right prefix for global labels. */ | |
56 | ||
57 | #define SYM(x) CONCAT1 (__USER_LABEL_PREFIX__, x) | |
58 | ||
59 | /* Use the right prefix for registers. */ | |
60 | ||
61 | #define REG(x) CONCAT1 (__REGISTER_PREFIX__, x) | |
62 | ||
63 | /* Use the right prefix for immediate values. */ | |
64 | ||
65 | #define IMM(x) CONCAT1 (__IMMEDIATE_PREFIX__, x) | |
66 | ||
67 | #define d0 REG (d0) | |
68 | #define d1 REG (d1) | |
69 | #define d2 REG (d2) | |
70 | #define d3 REG (d3) | |
71 | #define d4 REG (d4) | |
72 | #define d5 REG (d5) | |
73 | #define d6 REG (d6) | |
74 | #define d7 REG (d7) | |
75 | #define a0 REG (a0) | |
76 | #define a1 REG (a1) | |
77 | #define a2 REG (a2) | |
78 | #define a3 REG (a3) | |
79 | #define a4 REG (a4) | |
80 | #define a5 REG (a5) | |
81 | #define a6 REG (a6) | |
82 | #define fp REG (fp) | |
83 | #define sp REG (sp) | |
84 | ||
85 | .text | |
86 | .proc | |
87 | .globl SYM (__divsi3) | |
88 | SYM (__divsi3): | |
89 | movel d2, sp@- | |
90 | ||
91 | moveq IMM (1), d2 /* sign of result stored in d2 (=1 or =-1) */ | |
92 | movel sp@(12), d1 /* d1 = divisor */ | |
93 | jpl L1 | |
94 | negl d1 | |
95 | #if !(defined(__mcf5200__) || defined(__mcoldfire__)) | |
96 | negb d2 /* change sign because divisor <0 */ | |
97 | #else | |
98 | negl d2 /* change sign because divisor <0 */ | |
99 | #endif | |
100 | L1: movel sp@(8), d0 /* d0 = dividend */ | |
101 | jpl L2 | |
102 | negl d0 | |
103 | #if !(defined(__mcf5200__) || defined(__mcoldfire__)) | |
104 | negb d2 | |
105 | #else | |
106 | negl d2 | |
107 | #endif | |
108 | ||
109 | L2: movel d1, sp@- | |
110 | movel d0, sp@- | |
111 | jbsr SYM (__udivsi3) /* divide abs(dividend) by abs(divisor) */ | |
112 | addql IMM (8), sp | |
113 | ||
114 | tstb d2 | |
115 | jpl L3 | |
116 | negl d0 | |
117 | ||
118 | L3: movel sp@+, d2 | |
119 | rts | |
120 |