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<title>Debugging with GDB: Disassembly In Guile</title>
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<a name="Disassembly-In-Guile"></a>
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<p>
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Next: <a href="I_002fO-Ports-in-Guile.html#I_002fO-Ports-in-Guile" accesskey="n" rel="next">I/O Ports in Guile</a>, Previous: <a href="Architectures-In-Guile.html#Architectures-In-Guile" accesskey="p" rel="previous">Architectures In Guile</a>, Up: <a href="Guile-API.html#Guile-API" accesskey="u" rel="up">Guile API</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Disassembly-In-Guile-1"></a>
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<h4 class="subsubsection">23.3.3.22 Disassembly In Guile</h4>
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<p>The disassembler can be invoked from Scheme code.
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Furthermore, the disassembler can take a Guile port as input,
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allowing one to disassemble from any source, and not just target memory.
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</p>
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<dl>
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<dt><a name="index-arch_002ddisassemble"></a>Scheme Procedure: <strong>arch-disassemble</strong> <em>arch start-pc <span class="roman">[</span>#:port port<span class="roman">]</span> <span class="roman">[</span>#:offset offset<span class="roman">]</span> <span class="roman">[</span>#:size size<span class="roman">]</span> <span class="roman">[</span>#:count count<span class="roman">]</span></em></dt>
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<dd><p>Return a list of disassembled instructions starting from the memory
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address <var>start-pc</var>.
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</p>
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<p>The optional argument <var>port</var> specifies the input port to read bytes from.
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If <var>port</var> is <code>#f</code> then bytes are read from target memory.
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</p>
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<p>The optional argument <var>offset</var> specifies the address offset of the
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first byte in <var>port</var>. This is useful, for example, when <var>port</var>
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specifies a ‘<samp>bytevector</samp>’ and you want the bytevector to be disassembled
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as if it came from that address. The <var>start-pc</var> passed to the reader
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for <var>port</var> is offset by the same amount.
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</p>
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<p>Example:
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</p><div class="smallexample">
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<pre class="smallexample">(gdb) guile (use-modules (rnrs io ports))
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(gdb) guile (define pc (value->integer (parse-and-eval "$pc")))
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(gdb) guile (define mem (open-memory #:start pc))
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(gdb) guile (define bv (get-bytevector-n mem 10))
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(gdb) guile (define bv-port (open-bytevector-input-port bv))
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(gdb) guile (define arch (current-arch))
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(gdb) guile (arch-disassemble arch pc #:port bv-port #:offset pc)
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(((address . 4195516) (asm . "mov $0x4005c8,%edi") (length . 5)))
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</pre></div>
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<p>The optional arguments <var>size</var> and
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<var>count</var> determine the number of instructions in the returned list.
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If either <var>size</var> or <var>count</var> is specified as zero, then
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no instructions are disassembled and an empty list is returned.
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If both the optional arguments <var>size</var> and <var>count</var> are
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specified, then a list of at most <var>count</var> disassembled instructions
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whose start address falls in the closed memory address interval from
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<var>start-pc</var> to (<var>start-pc</var> + <var>size</var> - 1) are returned.
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If <var>size</var> is not specified, but <var>count</var> is specified,
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then <var>count</var> number of instructions starting from the address
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<var>start-pc</var> are returned. If <var>count</var> is not specified but
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<var>size</var> is specified, then all instructions whose start address
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falls in the closed memory address interval from <var>start-pc</var> to
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(<var>start-pc</var> + <var>size</var> - 1) are returned.
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If neither <var>size</var> nor <var>count</var> are specified, then a single
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instruction at <var>start-pc</var> is returned.
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</p>
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<p>Each element of the returned list is an alist (associative list)
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with the following keys:
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</p>
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<dl compact="compact">
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<dt><code>address</code></dt>
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<dd><p>The value corresponding to this key is a Guile integer of
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the memory address of the instruction.
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</p>
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</dd>
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<dt><code>asm</code></dt>
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<dd><p>The value corresponding to this key is a string value which represents
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the instruction with assembly language mnemonics. The assembly
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language flavor used is the same as that specified by the current CLI
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variable <code>disassembly-flavor</code>. See <a href="Machine-Code.html#Machine-Code">Machine Code</a>.
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</p>
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</dd>
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<dt><code>length</code></dt>
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<dd><p>The value corresponding to this key is the length of the instruction in bytes.
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</p>
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</dd>
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</dl>
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</dd></dl>
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<div class="header">
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<p>
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Next: <a href="I_002fO-Ports-in-Guile.html#I_002fO-Ports-in-Guile" accesskey="n" rel="next">I/O Ports in Guile</a>, Previous: <a href="Architectures-In-Guile.html#Architectures-In-Guile" accesskey="p" rel="previous">Architectures In Guile</a>, Up: <a href="Guile-API.html#Guile-API" accesskey="u" rel="up">Guile API</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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