sdcc/device/lib/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