46 lines
1.7 KiB
ArmAsm
46 lines
1.7 KiB
ArmAsm
|
/***************************************************************************
|
||
|
|
* Copyright (C) 2014 by Jeff Ciesielski *
|
||
|
|
* jeffciesielski@gmail.com *
|
||
|
|
* *
|
||
|
|
* Based on the armv7m erase checker by: *
|
||
|
|
* Copyright (C) 2010 by Spencer Oliver *
|
||
|
|
* spen@spen-soft.co.uk *
|
||
|
|
* *
|
||
|
|
* This program is free software; you can redistribute it and/or modify *
|
||
|
|
* it under the terms of the GNU General Public License as published by *
|
||
|
|
* the Free Software Foundation; either version 2 of the License, or *
|
||
|
|
* (at your option) any later version. *
|
||
|
|
* *
|
||
|
|
* This program is distributed in the hope that it will be useful, *
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
|
||
|
|
* GNU General Public License for more details. *
|
||
|
|
* *
|
||
|
|
***************************************************************************/
|
||
|
|
|
||
|
|
/*
|
||
|
|
parameters:
|
||
|
|
r0 - address in
|
||
|
|
r1 - byte count
|
||
|
|
r2 - mask - result out
|
||
|
|
*/
|
||
|
|
|
||
|
|
.text
|
||
|
|
.syntax unified
|
||
|
|
.cpu cortex-m0
|
||
|
|
.thumb
|
||
|
|
.thumb_func
|
||
|
|
|
||
|
|
.align 2
|
||
|
|
|
||
|
|
loop:
|
||
|
|
ldrb r3, [r0]
|
||
|
|
adds r0, #1
|
||
|
|
orrs r2, r2, r3
|
||
|
|
subs r1, r1, #1
|
||
|
|
bne loop
|
||
|
|
end:
|
||
|
|
bkpt #0
|
||
|
|
|
||
|
|
.end
|