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 103
 104 <div class="header">
 105   <div class="headertitle"><div class="title">defs.h</div></div>
 106 </div><!--header-->
 107 <div class="contents">
 108 <div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/*</span></div>
 109 <div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.</span></div>
 110 <div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> *</span></div>
 111 <div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> * SPDX-License-Identifier: BSD-3-Clause</span></div>
 112 <div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> */</span></div>
 113 <div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span> </div>
 114 <div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="preprocessor">#ifndef _PICO_BINARY_INFO_DEFS_H</span></div>
 115 <div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="preprocessor">#define _PICO_BINARY_INFO_DEFS_H</span></div>
 116 <div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span> </div>
 117 <div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment">// this file is for pre-processor definitions only</span></div>
 118 <div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span> </div>
 119 <div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment">// should be found within the first 256 bytes of the real binary (i.e. after the flash second stage if a flash binary)</span></div>
 120 <div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment">//</span></div>
 121 <div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment">// Note the layout is:</span></div>
 122 <div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment">//</span></div>
 123 <div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment">// addr      : BINARY_INFO_MARKER_START</span></div>
 124 <div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment">// addr+0x04 : __binary_info_start</span></div>
 125 <div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment">// addr+0x08 : __binary_info_end</span></div>
 126 <div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="comment">// addr+0x0c : __address_mapping_table</span></div>
 127 <div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span><span class="comment">// addr+0x10 | BINARY_INFO_MARKER_END</span></div>
 128 <div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span><span class="comment">//</span></div>
 129 <div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="comment">// __binary_info_start to __binary_info_end are the start, end (non inclusive) of an array</span></div>
 130 <div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span><span class="comment">// of pointers to binary_info_t structures</span></div>
 131 <div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span><span class="comment">//</span></div>
 132 <div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span><span class="comment">// __address_mapping_table is an array of the following items:</span></div>
 133 <div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span><span class="comment">//</span></div>
 134 <div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span><span class="comment">// uint32_t source_addr_start</span></div>
 135 <div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span><span class="comment">// uint32_t dest_addr_start</span></div>
 136 <div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span><span class="comment">// uint32_t dest_addr_end</span></div>
 137 <div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span><span class="comment">//</span></div>
 138 <div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span><span class="comment">// representing a mapping from the stored address in the binary/flash to addresses at runtime.</span></div>
 139 <div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span><span class="comment">// The linker will store pointers within the binary using their runtime values, however because of</span></div>
 140 <div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span><span class="comment">// &quot;AT&quot; mapping in the link script these addresses actually correspond to a different address in the binary</span></div>
 141 <div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span><span class="comment">// image. This mapping (which in the case of crt0.S is simply the data copy table used at initialization</span></div>
 142 <div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span><span class="comment">// to copy data into its runtime location) can be used by picotool or others to reverse the mapping to find data</span></div>
 143 <div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span><span class="comment">// within the binary.</span></div>
 144 <div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span><span class="comment">//</span></div>
 145 <div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span><span class="comment">// Note the above array is terminated with a NULL source_addr_start</span></div>
 146 <div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span> </div>
 147 <div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span><span class="preprocessor">#define BINARY_INFO_MARKER_START 0x7188ebf2</span></div>
 148 <div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span><span class="preprocessor">#define BINARY_INFO_MARKER_END 0xe71aa390</span></div>
 149 <div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span> </div>
 150 <div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span><span class="preprocessor">#endif</span></div>
 151 </div><!-- fragment --></div><!-- contents -->
 152 </div><!-- doc-content -->
 153
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