104 lines
5.9 KiB
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104 lines
5.9 KiB
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<title>Dump/Restore Files - Debugging with GDB</title>
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<a name="Dump%2fRestore-Files"></a>
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<a name="Dump_002fRestore-Files"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Core-File-Generation.html#Core-File-Generation">Core File Generation</a>,
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Previous: <a rel="previous" accesskey="p" href="Memory-Region-Attributes.html#Memory-Region-Attributes">Memory Region Attributes</a>,
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Up: <a rel="up" accesskey="u" href="Data.html#Data">Data</a>
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<h3 class="section">10.18 Copy Between Memory and a File</h3>
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<p><a name="index-dump_002frestore-files-791"></a><a name="index-append-data-to-a-file-792"></a><a name="index-dump-data-to-a-file-793"></a><a name="index-restore-data-from-a-file-794"></a>
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You can use the commands <code>dump</code>, <code>append</code>, and
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<code>restore</code> to copy data between target memory and a file. The
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<code>dump</code> and <code>append</code> commands write data to a file, and the
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<code>restore</code> command reads data from a file back into the inferior's
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memory. Files may be in binary, Motorola S-record, Intel hex,
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Tektronix Hex, or Verilog Hex format; however, <span class="sc">gdb</span> can only
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append to binary files, and cannot read from Verilog Hex files.
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<a name="index-dump-795"></a>
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<dl><dt><code>dump </code><span class="roman">[</span><var>format</var><span class="roman">]</span><code> memory </code><var>filename</var> <var>start_addr</var> <var>end_addr</var><dt><code>dump </code><span class="roman">[</span><var>format</var><span class="roman">]</span><code> value </code><var>filename</var> <var>expr</var><dd>Dump the contents of memory from <var>start_addr</var> to <var>end_addr</var>,
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or the value of <var>expr</var>, to <var>filename</var> in the given format.
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<p>The <var>format</var> parameter may be any one of:
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<dl>
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<dt><code>binary</code><dd>Raw binary form.
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<br><dt><code>ihex</code><dd>Intel hex format.
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<br><dt><code>srec</code><dd>Motorola S-record format.
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<br><dt><code>tekhex</code><dd>Tektronix Hex format.
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<br><dt><code>verilog</code><dd>Verilog Hex format.
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</dl>
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<p><span class="sc">gdb</span> uses the same definitions of these formats as the
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<span class="sc">gnu</span> binary utilities, like ‘<samp><span class="samp">objdump</span></samp>’ and ‘<samp><span class="samp">objcopy</span></samp>’. If
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<var>format</var> is omitted, <span class="sc">gdb</span> dumps the data in raw binary
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form.
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<p><a name="index-append-796"></a><br><dt><code>append </code><span class="roman">[</span><code>binary</code><span class="roman">]</span><code> memory </code><var>filename</var> <var>start_addr</var> <var>end_addr</var><dt><code>append </code><span class="roman">[</span><code>binary</code><span class="roman">]</span><code> value </code><var>filename</var> <var>expr</var><dd>Append the contents of memory from <var>start_addr</var> to <var>end_addr</var>,
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or the value of <var>expr</var>, to the file <var>filename</var>, in raw binary form.
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(<span class="sc">gdb</span> can only append data to files in raw binary form.)
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<p><a name="index-restore-797"></a><br><dt><code>restore </code><var>filename</var> <span class="roman">[</span><code>binary</code><span class="roman">]</span> <var>bias</var> <var>start</var> <var>end</var><dd>Restore the contents of file <var>filename</var> into memory. The
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<code>restore</code> command can automatically recognize any known <span class="sc">bfd</span>
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file format, except for raw binary. To restore a raw binary file you
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must specify the optional keyword <code>binary</code> after the filename.
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<p>If <var>bias</var> is non-zero, its value will be added to the addresses
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contained in the file. Binary files always start at address zero, so
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they will be restored at address <var>bias</var>. Other bfd files have
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a built-in location; they will be restored at offset <var>bias</var>
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from that location.
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<p>If <var>start</var> and/or <var>end</var> are non-zero, then only data between
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file offset <var>start</var> and file offset <var>end</var> will be restored.
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These offsets are relative to the addresses in the file, before
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the <var>bias</var> argument is applied.
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</dl>
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</body></html>
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