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; #################################################################################################
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; # < boot_crt0.asm - neo430 bootloader start-up code > #
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; # ********************************************************************************************* #
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; # BSD 3-Clause License #
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; # #
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; # Copyright (c) 2020, Stephan Nolting. All rights reserved. #
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; # #
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; # Redistribution and use in source and binary forms, with or without modification, are #
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; # permitted provided that the following conditions are met: #
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; # #
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; # 1. Redistributions of source code must retain the above copyright notice, this list of #
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; # conditions and the following disclaimer. #
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; # #
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; # 2. Redistributions in binary form must reproduce the above copyright notice, this list of #
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; # conditions and the following disclaimer in the documentation and/or other materials #
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; # provided with the distribution. #
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; # #
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; # 3. Neither the name of the copyright holder nor the names of its contributors may be used to #
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; # endorse or promote products derived from this software without specific prior written #
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; # permission. #
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; # #
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; # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS #
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; # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF #
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; # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE #
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; # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, #
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; # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE #
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; # GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED #
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; # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING #
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; # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED #
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; # OF THE POSSIBILITY OF SUCH DAMAGE. #
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; # ********************************************************************************************* #
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; # The NEO430 Processor - https://github.com/stnolting/neo430 #
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; #################################################################################################
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.file "boot_crt0.asm"
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.section .text
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.p2align 1,0
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__boot_crt0:
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; -----------------------------------------------------------
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; Minimal required hardware setup
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; -----------------------------------------------------------
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mov #(0xC000-2), r1 ; = DMEM (RAM) base address
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add &0xFFFA, r1 ; add DMEM (RAM) size in bytes to SP
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;sub #2, r1 ; address of last entry of stack (done in first instruction)
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; -----------------------------------------------------------
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; This is where the actual application is started
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; -----------------------------------------------------------
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jmp main ; do a simple jump - we are not coming back
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.Lfe0:
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.size __boot_crt0,.Lfe0-__boot_crt0
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