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