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   1 /***************************************************************************
   2  *   Copyright (C) 2014 by Jeff Ciesielski                                 *
   3  *   jeffciesielski@gmail.com                                              *
   4  *                                                                         *
   5  *   Based on the armv7m erase checker by:                                 *
   6  *   Copyright (C) 2010 by Spencer Oliver                                  *
   7  *   spen@spen-soft.co.uk                                                  *
   8  *                                                                         *
   9  *   This program is free software; you can redistribute it and/or modify  *
  10  *   it under the terms of the GNU General Public License as published by  *
  11  *   the Free Software Foundation; either version 2 of the License, or     *
  12  *   (at your option) any later version.                                   *
  13  *                                                                         *
  14  *   This program is distributed in the hope that it will be useful,       *
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  17  *   GNU General Public License for more details.                          *
  18  *                                                                         *
  19  ***************************************************************************/
  20
  21 /*
  22         parameters:
  23         r0 - address in
  24         r1 - byte count
  25         r2 - mask - result out
  26 */
  27
  28         .text
  29         .syntax unified
  30         .cpu cortex-m0
  31         .thumb
  32         .thumb_func
  33
  34         .align  2
  35
  36 loop:
  37         ldrb    r3, [r0]
  38         adds    r0, #1
  39         orrs    r2, r2, r3
  40         subs    r1, r1, #1
  41         bne             loop
  42 end:
  43         bkpt    #0
  44
  45         .end