sdcc/device/lib/stm8/strcpy.s

   1 ;--------------------------------------------------------------------------
   2 ;  strcpy.s
   3 ;
   4 ;  Copyright (C) 2016-2021, Philipp Klaus Krause
   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         .globl _strcpy
  30
  31         .area CODE
  32
  33 ; char *strcpy (char * restrict dest, const char * restrict src)
  34 _strcpy:
  35         pushw   x
  36
  37         ldw     y, (0x05, sp)
  38
  39 loop:
  40         ld      a, (y)
  41         ld      (x), a
  42         jreq    end
  43         ld      a, (1, y)
  44         ld      (1, x), a
  45         jreq    end
  46         ld      a, (2, y)
  47         ld      (2, x), a
  48         jreq    end
  49         addw    y, #3
  50         addw    x, #3
  51         jra     loop
  52
  53 end:
  54         popw    x
  55         popw    y
  56         addw    sp, #2
  57         jp      (y)
  58