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167 lines
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167 lines
8.3 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Free Software" and "Free Software Needs
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Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
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and with the Back-Cover Texts as in (a) below.
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(a) The FSF's Back-Cover Text is: "You are free to copy and modify
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Memory Ports in Guile (Debugging with GDB)</title>
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<meta name="description" content="Memory Ports in Guile (Debugging with GDB)">
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<meta name="keywords" content="Memory Ports in Guile (Debugging with GDB)">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Guile-API.html#Guile-API" rel="up" title="Guile API">
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<link href="Iterators-In-Guile.html#Iterators-In-Guile" rel="next" title="Iterators In Guile">
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<link href="I_002fO-Ports-in-Guile.html#I_002fO-Ports-in-Guile" rel="prev" title="I/O Ports in Guile">
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</head>
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<body lang="en">
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<a name="Memory-Ports-in-Guile"></a>
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<div class="header">
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<p>
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Next: <a href="Iterators-In-Guile.html#Iterators-In-Guile" accesskey="n" rel="next">Iterators In Guile</a>, Previous: <a href="I_002fO-Ports-in-Guile.html#I_002fO-Ports-in-Guile" accesskey="p" rel="prev">I/O Ports 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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</div>
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<hr>
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<a name="Memory-Ports-in-Guile-1"></a>
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<h4 class="subsubsection">23.3.3.24 Memory Ports in Guile</h4>
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<p><small>GDB</small> provides a <code>port</code> interface to target memory.
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This allows Guile code to read/write target memory using Guile’s port and
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bytevector functionality. The main routine is <code>open-memory</code> which
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returns a port object. One can then read/write memory using that object.
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</p>
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<dl>
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<dt><a name="index-open_002dmemory"></a>Scheme Procedure: <strong>open-memory</strong> <em><span class="roman">[</span>#:mode mode] <span class="roman">[</span>#:start address] <span class="roman">[</span>#:size size]</em></dt>
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<dd><p>Return a port object that can be used for reading and writing memory.
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The port will be open according to <var>mode</var>, which is the standard
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mode argument to Guile port open routines, except that the ‘<samp>"a"</samp>’
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and ‘<samp>"l"</samp>’ modes are not supported.
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See <a href="http://www.gnu.org/software/guile/manual/html_node/File-Ports.html#File-Ports">File Ports</a> in <cite>GNU Guile Reference Manual</cite>.
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The ‘<samp>"b"</samp>’ (binary) character may be present, but is ignored:
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memory ports are binary only. If ‘<samp>"0"</samp>’ is appended then
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the port is marked as unbuffered.
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The default is ‘<samp>"r"</samp>’, read-only and buffered.
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</p>
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<p>The chunk of memory that can be accessed can be bounded.
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If both <var>start</var> and <var>size</var> are unspecified, all of memory can be
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accessed. If only <var>start</var> is specified, all of memory from that point
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on can be accessed. If only <var>size</var> if specified, all memory in the
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range [0,<var>size</var>) can be accessed. If both are specified, all memory
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in the rane [<var>start</var>,<var>start</var>+<var>size</var>) can be accessed.
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</p></dd></dl>
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<dl>
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<dt><a name="index-memory_002dport_003f"></a>Scheme Procedure: <strong>memory-port?</strong></dt>
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<dd><p>Return <code>#t</code> if <var>object</var> is an object of type <code><gdb:memory-port></code>.
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Otherwise return <code>#f</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-memory_002dport_002drange"></a>Scheme Procedure: <strong>memory-port-range</strong> <em>memory-port</em></dt>
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<dd><p>Return the range of <code><gdb:memory-port></code> <var>memory-port</var> as a list
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of two elements: <code>(start end)</code>. The range is <var>start</var> to <var>end</var>
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inclusive.
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</p></dd></dl>
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<dl>
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<dt><a name="index-memory_002dport_002dread_002dbuffer_002dsize"></a>Scheme Procedure: <strong>memory-port-read-buffer-size</strong> <em>memory-port</em></dt>
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<dd><p>Return the size of the read buffer of <code><gdb:memory-port></code>
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<var>memory-port</var>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-set_002dmemory_002dport_002dread_002dbuffer_002dsize_0021"></a>Scheme Procedure: <strong>set-memory-port-read-buffer-size!</strong> <em>memory-port size</em></dt>
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<dd><p>Set the size of the read buffer of <code><gdb:memory-port></code>
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<var>memory-port</var> to <var>size</var>. The result is unspecified.
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</p></dd></dl>
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<dl>
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<dt><a name="index-memory_002dport_002dwrite_002dbuffer_002dsize"></a>Scheme Procedure: <strong>memory-port-write-buffer-size</strong> <em>memory-port</em></dt>
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<dd><p>Return the size of the write buffer of <code><gdb:memory-port></code>
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<var>memory-port</var>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-set_002dmemory_002dport_002dwrite_002dbuffer_002dsize_0021"></a>Scheme Procedure: <strong>set-memory-port-write-buffer-size!</strong> <em>memory-port size</em></dt>
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<dd><p>Set the size of the write buffer of <code><gdb:memory-port></code>
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<var>memory-port</var> to <var>size</var>. The result is unspecified.
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</p></dd></dl>
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<p>A memory port is closed like any other port, with <code>close-port</code>.
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</p>
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<p>Combined with Guile’s <code>bytevectors</code>, memory ports provide a lot
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of utility. For example, to fill a buffer of 10 integers in memory,
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one can do something like the following.
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</p>
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<div class="smallexample">
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<pre class="smallexample">;; In the program: int buffer[10];
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(use-modules (rnrs bytevectors))
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(use-modules (rnrs io ports))
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(define addr (parse-and-eval "buffer"))
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(define n 10)
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(define byte-size (* n 4))
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(define mem-port (open-memory #:mode "r+" #:start
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(value->integer addr) #:size byte-size))
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(define byte-vec (make-bytevector byte-size))
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(do ((i 0 (+ i 1)))
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((>= i n))
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(bytevector-s32-native-set! byte-vec (* i 4) (* i 42)))
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(put-bytevector mem-port byte-vec)
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(close-port mem-port)
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</pre></div>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Iterators-In-Guile.html#Iterators-In-Guile" accesskey="n" rel="next">Iterators In Guile</a>, Previous: <a href="I_002fO-Ports-in-Guile.html#I_002fO-Ports-in-Guile" accesskey="p" rel="prev">I/O Ports 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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</div>
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</body>
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</html>
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