| <html lang="en"> |
| <head> |
| <title>Disassembly In Guile - Debugging with GDB</title> |
| <meta http-equiv="Content-Type" content="text/html"> |
| <meta name="description" content="Debugging with GDB"> |
| <meta name="generator" content="makeinfo 4.13"> |
| <link title="Top" rel="start" href="index.html#Top"> |
| <link rel="up" href="Guile-API.html#Guile-API" title="Guile API"> |
| <link rel="prev" href="Architectures-In-Guile.html#Architectures-In-Guile" title="Architectures In Guile"> |
| <link rel="next" href="I_002fO-Ports-in-Guile.html#I_002fO-Ports-in-Guile" title="I/O Ports in Guile"> |
| <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> |
| <!-- |
| Copyright (C) 1988-2019 Free Software Foundation, Inc. |
| |
| Permission is granted to copy, distribute and/or modify this document |
| under the terms of the GNU Free Documentation License, Version 1.3 or |
| any later version published by the Free Software Foundation; with the |
| Invariant Sections being ``Free Software'' and ``Free Software Needs |
| Free Documentation'', with the Front-Cover Texts being ``A GNU Manual,'' |
| and with the Back-Cover Texts as in (a) below. |
| |
| (a) The FSF's Back-Cover Text is: ``You are free to copy and modify |
| this GNU Manual. Buying copies from GNU Press supports the FSF in |
| developing GNU and promoting software freedom.'' |
| --> |
| <meta http-equiv="Content-Style-Type" content="text/css"> |
| <style type="text/css"><!-- |
| pre.display { font-family:inherit } |
| pre.format { font-family:inherit } |
| pre.smalldisplay { font-family:inherit; font-size:smaller } |
| pre.smallformat { font-family:inherit; font-size:smaller } |
| pre.smallexample { font-size:smaller } |
| pre.smalllisp { font-size:smaller } |
| span.sc { font-variant:small-caps } |
| span.roman { font-family:serif; font-weight:normal; } |
| span.sansserif { font-family:sans-serif; font-weight:normal; } |
| --></style> |
| </head> |
| <body> |
| <div class="node"> |
| <a name="Disassembly-In-Guile"></a> |
| <p> |
| Next: <a rel="next" accesskey="n" href="I_002fO-Ports-in-Guile.html#I_002fO-Ports-in-Guile">I/O Ports in Guile</a>, |
| Previous: <a rel="previous" accesskey="p" href="Architectures-In-Guile.html#Architectures-In-Guile">Architectures In Guile</a>, |
| Up: <a rel="up" accesskey="u" href="Guile-API.html#Guile-API">Guile API</a> |
| <hr> |
| </div> |
| |
| <h5 class="subsubsection">23.3.3.22 Disassembly In Guile</h5> |
| |
| <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. |
| |
| <!-- TODO: line length --> |
| <div class="defun"> |
| — Scheme Procedure: <b>arch-disassemble</b><var> arch start-pc </var><span class="roman">[</span><var>#:port port</var><span class="roman">]</span> <span class="roman">[</span><var>#:offset offset</var><span class="roman">]</span> <span class="roman">[</span><var>#:size size</var><span class="roman">]</span> <span class="roman">[</span><var>#:count count</var><span class="roman">]</span><var><a name="index-arch_002ddisassemble-2843"></a></var><br> |
| <blockquote><p>Return a list of disassembled instructions starting from the memory |
| address <var>start-pc</var>. |
| |
| <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>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><span class="samp">bytevector</span></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>Example: |
| <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> |
| <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>Each element of the returned list is an alist (associative list) |
| with the following keys: |
| |
| <dl> |
| <dt><code>address</code><dd>The value corresponding to this key is a Guile integer of |
| the memory address of the instruction. |
| |
| <br><dt><code>asm</code><dd>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>. |
| |
| <br><dt><code>length</code><dd>The value corresponding to this key is the length of the instruction in bytes. |
| |
| </dl> |
| </p></blockquote></div> |
| |
| </body></html> |
| |
