40 lines
1.6 KiB
ArmAsm
40 lines
1.6 KiB
ArmAsm
/***************************************************************************
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* Copyright (C) 2010 by Spencer Oliver *
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* spen@spen-soft.co.uk *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
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***************************************************************************/
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/*
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parameters:
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r0 - address in
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r1 - byte count
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r2 - mask - result out
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*/
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.text
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.arm
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loop:
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ldrb r3, [r0], #1
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and r2, r2, r3
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subs r1, r1, #1
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bne loop
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end:
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bkpt #0
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.end
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