64 lines
2.6 KiB
ArmAsm
64 lines
2.6 KiB
ArmAsm
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/***************************************************************************
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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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* Copyright (C) 2011 Øyvind Harboe *
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* oyvind.harboe@zylin.com *
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* *
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* Copyright (C) 2011 Clement Burin des Roziers *
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* clement.burin-des-roziers@hikob.com *
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* *
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* Copyright (C) 2017 Armin van der Togt *
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* armin@otheruse.nl *
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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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.text
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.syntax unified
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.cpu cortex-m0
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.thumb
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/*
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r0 - destination address
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r1 - source address
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r2 - count
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*/
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.thumb_func
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.global _start
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_start:
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// r2 = source + count * 4
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lsls r2, r2, #2
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adds r2, r1, r2
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// Go to compare
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b test_done
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write_word:
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// load word from address in r1 and increase r1 by 4
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ldmia r1!, {r3}
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// store word to address in r0 and increase r0 by 4
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stmia r0!, {r3}
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test_done:
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// compare r1 and r2
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cmp r1, r2
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// loop if not equal
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bne write_word
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// Set breakpoint to exit
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bkpt #0x00
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