1 /* SPDX-License-Identifier: GPL-2.0 */ !! 1 /* libgcc1 routines for 68000 w/o floating-point hardware.
2 #include <linux/linkage.h> !! 2 Copyright (C) 1994, 1996, 1997, 1998 Free Software Foundation, Inc.
3 3
4 /* !! 4 This file is part of GNU CC.
5 * modulo operation for 32 bit integers. !! 5
6 * Input : op1 in Reg r5 !! 6 GNU CC is free software; you can redistribute it and/or modify it
7 * op2 in Reg r6 !! 7 under the terms of the GNU General Public License as published by the
8 * Output: op1 mod op2 in Reg r3 !! 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
9 */ 34 */
10 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
11 .text 87 .text
12 .globl __modsi3 !! 88 .proc
13 .type __modsi3, @function !! 89 .globl SYM (__modsi3)
14 .ent __modsi3 !! 90 SYM (__modsi3):
15 !! 91 movel sp@(8), d1 /* d1 = divisor */
16 __modsi3: !! 92 movel sp@(4), d0 /* d0 = dividend */
17 .frame r1, 0, r15 !! 93 movel d1, sp@-
18 !! 94 movel d0, sp@-
19 addik r1, r1, -16 !! 95 jbsr SYM (__divsi3)
20 swi r28, r1, 0 !! 96 addql IMM (8), sp
21 swi r29, r1, 4 !! 97 movel sp@(8), d1 /* d1 = divisor */
22 swi r30, r1, 8 !! 98 #if !(defined(__mcf5200__) || defined(__mcoldfire__))
23 swi r31, r1, 12 !! 99 movel d1, sp@-
24 !! 100 movel d0, sp@-
25 beqi r6, div_by_zero /* div_by_zero !! 101 jbsr SYM (__mulsi3) /* d0 = (a/b)*b */
26 beqi r5, result_is_zero /* result i !! 102 addql IMM (8), sp
27 bgeid r5, r5_pos !! 103 #else
28 /* get the sign of the result [ depend !! 104 mulsl d1,d0
29 add r28, r5, r0 !! 105 #endif
30 rsubi r5, r5, 0 /* make r5 po !! 106 movel sp@(4), d1 /* d1 = dividend */
31 r5_pos: !! 107 subl d0, d1 /* d1 = a - (a/b)*b */
32 bgei r6, r6_pos !! 108 movel d1, d0
33 rsubi r6, r6, 0 /* make r6 po !! 109 rts
34 r6_pos: <<
35 addik r3, r0, 0 /* clear mod */ <<
36 addik r30, r0, 0 /* clear div */ <<
37 addik r29, r0, 32 /* initialize the <<
38 /* first part try to find the first '1' in the <<
39 div1: <<
40 add r5, r5, r5 /* left shift logic <<
41 bgeid r5, div1 <<
42 addik r29, r29, -1 <<
43 div2: <<
44 /* left shift logical r5 get the '1' i <<
45 add r5, r5, r5 <<
46 addc r3, r3, r3 /* move that bit in <<
47 rsub r31, r6, r3 /* try to subtract <<
48 blti r31, mod_too_small <<
49 /* move the r31 to mod since the resul <<
50 or r3, r0, r31 <<
51 addik r30, r30, 1 <<
52 mod_too_small: <<
53 addik r29, r29, -1 <<
54 beqi r29, loop_end <<
55 add r30, r30, r30 /* shift in the <<
56 bri div2 /* div2 */ <<
57 loop_end: <<
58 bgei r28, return_here <<
59 brid return_here <<
60 rsubi r3, r3, 0 /* negate the result <<
61 div_by_zero: <<
62 result_is_zero: <<
63 or r3, r0, r0 /* set result to 0 <<
64 return_here: <<
65 /* restore values of csrs and that of r3 and t <<
66 lwi r28, r1, 0 <<
67 lwi r29, r1, 4 <<
68 lwi r30, r1, 8 <<
69 lwi r31, r1, 12 <<
70 rtsd r15, 8 <<
71 addik r1, r1, 16 <<
72 110
73 .size __modsi3, . - __modsi3 !! 111 EXPORT_SYMBOL(__modsi3)
74 .end __modsi3 <<
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