gbdk-2020 | GameBoy Development Kit |
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gbdk-lib/libc/asm/mos6502/_modulong.s
1 ;-------------------------------------------------------------------------
2 ; _modulong.s - routine for remainder of 32 bit unsigned long division
3 ;
4 ; Copyright (C) 2022, Gabriele Gorla
5 ;
6 ; This library 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 ; This library is distributed in the hope that it will be useful,
12 ; but WITHOUT ANY WARRANTY; without even the implied warranty of
13 ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 ; GNU General Public License for more details.
15 ;
16 ; You should have received a copy of the GNU General Public License
17 ; along with this library; see the file COPYING. If not, write to the
18 ; Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
19 ; MA 02110-1301, USA.
20 ;
21 ; As a special exception, if you link this library with other files,
22 ; some of which are compiled with SDCC, to produce an executable,
23 ; this library does not by itself cause the resulting executable to
24 ; be covered by the GNU General Public License. This exception does
25 ; not however invalidate any other reasons why the executable file
26 ; might be covered by the GNU General Public License.
27 ;-------------------------------------------------------------------------
28
29 .module _modulong
30
31 ;--------------------------------------------------------
32 ; exported symbols
33 ;--------------------------------------------------------
34 .globl __modulong
35
36 ;--------------------------------------------------------
37 ; local aliases
38 ;--------------------------------------------------------
39 .define res0 "__modulong_PARM_1+0"
40 .define res1 "__modulong_PARM_1+1"
41 .define res2 "___SDCC_m6502_ret2"
42 .define res3 "___SDCC_m6502_ret3"
43 .define den "__modulong_PARM_2"
44 .define rem "___SDCC_m6502_ret4"
45 .define s1 "___SDCC_m6502_ret0"
46 .define s2 "___SDCC_m6502_ret1"
47
48 ;--------------------------------------------------------
49 ; code
50 ;--------------------------------------------------------
51 .area _CODE
52
53 __modulong:
54 jsr ___udivmod32
55 lda *rem+3
56 sta *res3
57 lda *rem+2
58 sta *res2
59 ldx *rem+1
60 lda *rem+0
61 rts
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