1 /* SPDX-License-Identifier: GPL-2.0-or-later W !! 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 #include <asm/asmmacro.h> <<
4 #include <asm/core.h> <<
5 <<
6 .macro do_addx2 dst, as, at, tmp <<
7 #if XCHAL_HAVE_ADDX <<
8 addx2 \dst, \as, \at <<
9 #else <<
10 slli \tmp, \as, 1 <<
11 add \dst, \tmp, \at <<
12 #endif <<
13 .endm <<
14 3
15 .macro do_addx4 dst, as, at, tmp !! 4 This file is part of GNU CC.
16 #if XCHAL_HAVE_ADDX !! 5
17 addx4 \dst, \as, \at !! 6 GNU CC is free software; you can redistribute it and/or modify it
18 #else !! 7 under the terms of the GNU General Public License as published by the
19 slli \tmp, \as, 2 !! 8 Free Software Foundation; either version 2, or (at your option) any
20 add \dst, \tmp, \at !! 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 #include <linux/export.h>
>> 36 /* These are predefined by new versions of GNU cpp. */
>> 37
>> 38 #ifndef __USER_LABEL_PREFIX__
>> 39 #define __USER_LABEL_PREFIX__ _
21 #endif 40 #endif
22 .endm <<
23 41
24 .macro do_addx8 dst, as, at, tmp !! 42 #ifndef __REGISTER_PREFIX__
25 #if XCHAL_HAVE_ADDX !! 43 #define __REGISTER_PREFIX__
26 addx8 \dst, \as, \at <<
27 #else <<
28 slli \tmp, \as, 3 <<
29 add \dst, \tmp, \at <<
30 #endif 44 #endif
31 .endm <<
32 45
33 ENTRY(__mulsi3) !! 46 #ifndef __IMMEDIATE_PREFIX__
>> 47 #define __IMMEDIATE_PREFIX__ #
>> 48 #endif
34 49
35 abi_entry_default !! 50 /* ANSI concatenation macros. */
36 51
37 #if XCHAL_HAVE_MUL32 !! 52 #define CONCAT1(a, b) CONCAT2(a, b)
38 mull a2, a2, a3 !! 53 #define CONCAT2(a, b) a ## b
39 54
40 #elif XCHAL_HAVE_MUL16 !! 55 /* Use the right prefix for global labels. */
41 or a4, a2, a3 <<
42 srai a4, a4, 16 <<
43 bnez a4, .LMUL16 <<
44 mul16u a2, a2, a3 <<
45 abi_ret_default <<
46 .LMUL16: <<
47 srai a4, a2, 16 <<
48 srai a5, a3, 16 <<
49 mul16u a7, a4, a3 <<
50 mul16u a6, a5, a2 <<
51 mul16u a4, a2, a3 <<
52 add a7, a7, a6 <<
53 slli a7, a7, 16 <<
54 add a2, a7, a4 <<
55 <<
56 #elif XCHAL_HAVE_MAC16 <<
57 mul.aa.hl a2, a3 <<
58 mula.aa.lh a2, a3 <<
59 rsr a5, ACCLO <<
60 umul.aa.ll a2, a3 <<
61 rsr a4, ACCLO <<
62 slli a5, a5, 16 <<
63 add a2, a4, a5 <<
64 <<
65 #else /* !MUL32 && !MUL16 && !MAC16 */ <<
66 <<
67 /* Multiply one bit at a time, but unr <<
68 exploit the addx instructions and a <<
69 Peel the first iteration to save a <<
70 <<
71 /* Avoid negative numbers. */ <<
72 xor a5, a2, a3 /* Top bit is <<
73 do_abs a3, a3, a6 <<
74 do_abs a2, a2, a6 <<
75 <<
76 /* Swap so the second argument is smal <<
77 sub a7, a2, a3 <<
78 mov a4, a3 <<
79 movgez a4, a2, a7 /* a4 = max (a <<
80 movltz a3, a2, a7 /* a3 = min (a <<
81 <<
82 movi a2, 0 <<
83 extui a6, a3, 0, 1 <<
84 movnez a2, a4, a6 <<
85 <<
86 do_addx2 a7, a4, a2, a7 <<
87 extui a6, a3, 1, 1 <<
88 movnez a2, a7, a6 <<
89 <<
90 do_addx4 a7, a4, a2, a7 <<
91 extui a6, a3, 2, 1 <<
92 movnez a2, a7, a6 <<
93 <<
94 do_addx8 a7, a4, a2, a7 <<
95 extui a6, a3, 3, 1 <<
96 movnez a2, a7, a6 <<
97 <<
98 bgeui a3, 16, .Lmult_main_loop <<
99 neg a3, a2 <<
100 movltz a2, a3, a5 <<
101 abi_ret_default <<
102 <<
103 .align 4 <<
104 .Lmult_main_loop: <<
105 srli a3, a3, 4 <<
106 slli a4, a4, 4 <<
107 <<
108 add a7, a4, a2 <<
109 extui a6, a3, 0, 1 <<
110 movnez a2, a7, a6 <<
111 <<
112 do_addx2 a7, a4, a2, a7 <<
113 extui a6, a3, 1, 1 <<
114 movnez a2, a7, a6 <<
115 <<
116 do_addx4 a7, a4, a2, a7 <<
117 extui a6, a3, 2, 1 <<
118 movnez a2, a7, a6 <<
119 <<
120 do_addx8 a7, a4, a2, a7 <<
121 extui a6, a3, 3, 1 <<
122 movnez a2, a7, a6 <<
123 <<
124 bgeui a3, 16, .Lmult_main_loop <<
125 <<
126 neg a3, a2 <<
127 movltz a2, a3, a5 <<
128 56
129 #endif /* !MUL32 && !MUL16 && !MAC16 */ !! 57 #define SYM(x) CONCAT1 (__USER_LABEL_PREFIX__, x)
130 58
131 abi_ret_default !! 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 (__mulsi3)
>> 88 SYM (__mulsi3):
>> 89 movew sp@(4), d0 /* x0 -> d0 */
>> 90 muluw sp@(10), d0 /* x0*y1 */
>> 91 movew sp@(6), d1 /* x1 -> d1 */
>> 92 muluw sp@(8), d1 /* x1*y0 */
>> 93 #if !(defined(__mcf5200__) || defined(__mcoldfire__))
>> 94 addw d1, d0
>> 95 #else
>> 96 addl d1, d0
>> 97 #endif
>> 98 swap d0
>> 99 clrw d0
>> 100 movew sp@(6), d1 /* x1 -> d1 */
>> 101 muluw sp@(10), d1 /* x1*y1 */
>> 102 addl d1, d0
132 103
133 ENDPROC(__mulsi3) !! 104 rts
134 EXPORT_SYMBOL(__mulsi3) !! 105 EXPORT_SYMBOL(__mulsi3)
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