1<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2<html> 3<!-- Copyright (C) 1988-2021 Free Software Foundation, Inc. 4 5Permission is granted to copy, distribute and/or modify this document 6under the terms of the GNU Free Documentation License, Version 1.3 or 7any later version published by the Free Software Foundation; with the 8Invariant Sections being "Free Software" and "Free Software Needs 9Free Documentation", with the Front-Cover Texts being "A GNU Manual," 10and with the Back-Cover Texts as in (a) below. 11 12(a) The FSF's Back-Cover Text is: "You are free to copy and modify 13this GNU Manual. Buying copies from GNU Press supports the FSF in 14developing GNU and promoting software freedom." --> 15<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> 16<head> 17<title>Debugging with GDB: Pointer Values</title> 18 19<meta name="description" content="Debugging with GDB: Pointer Values"> 20<meta name="keywords" content="Debugging with GDB: Pointer Values"> 21<meta name="resource-type" content="document"> 22<meta name="distribution" content="global"> 23<meta name="Generator" content="makeinfo"> 24<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 25<link href="index.html#Top" rel="start" title="Top"> 26<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index"> 27<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> 28<link href="Protocol_002dspecific-Representation-of-Datatypes.html#Protocol_002dspecific-Representation-of-Datatypes" rel="up" title="Protocol-specific Representation of Datatypes"> 29<link href="Memory-Transfer.html#Memory-Transfer" rel="next" title="Memory Transfer"> 30<link href="Integral-Datatypes.html#Integral-Datatypes" rel="previous" title="Integral Datatypes"> 31<style type="text/css"> 32<!-- 33a.summary-letter {text-decoration: none} 34blockquote.smallquotation {font-size: smaller} 35div.display {margin-left: 3.2em} 36div.example {margin-left: 3.2em} 37div.indentedblock {margin-left: 3.2em} 38div.lisp {margin-left: 3.2em} 39div.smalldisplay {margin-left: 3.2em} 40div.smallexample {margin-left: 3.2em} 41div.smallindentedblock {margin-left: 3.2em; font-size: smaller} 42div.smalllisp {margin-left: 3.2em} 43kbd {font-style:oblique} 44pre.display {font-family: inherit} 45pre.format {font-family: inherit} 46pre.menu-comment {font-family: serif} 47pre.menu-preformatted {font-family: serif} 48pre.smalldisplay {font-family: inherit; font-size: smaller} 49pre.smallexample {font-size: smaller} 50pre.smallformat {font-family: inherit; font-size: smaller} 51pre.smalllisp {font-size: smaller} 52span.nocodebreak {white-space:nowrap} 53span.nolinebreak {white-space:nowrap} 54span.roman {font-family:serif; font-weight:normal} 55span.sansserif {font-family:sans-serif; font-weight:normal} 56ul.no-bullet {list-style: none} 57--> 58</style> 59 60 61</head> 62 63<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> 64<a name="Pointer-Values"></a> 65<div class="header"> 66<p> 67Next: <a href="Memory-Transfer.html#Memory-Transfer" accesskey="n" rel="next">Memory Transfer</a>, Previous: <a href="Integral-Datatypes.html#Integral-Datatypes" accesskey="p" rel="previous">Integral Datatypes</a>, Up: <a href="Protocol_002dspecific-Representation-of-Datatypes.html#Protocol_002dspecific-Representation-of-Datatypes" accesskey="u" rel="up">Protocol-specific Representation of Datatypes</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> 68</div> 69<hr> 70<a name="Pointer-Values-1"></a> 71<h4 class="unnumberedsubsubsec">Pointer Values</h4> 72<a name="index-pointer-values_002c-in-file_002di_002fo-protocol"></a> 73 74<p>Pointers to target data are transmitted as they are. An exception 75is made for pointers to buffers for which the length isn’t 76transmitted as part of the function call, namely strings. Strings 77are transmitted as a pointer/length pair, both as hex values, e.g. 78</p> 79<div class="smallexample"> 80<pre class="smallexample"><code>1aaf/12</code> 81</pre></div> 82 83<p>which is a pointer to data of length 18 bytes at position 0x1aaf. 84The length is defined as the full string length in bytes, including 85the trailing null byte. For example, the string <code>"hello world"</code> 86at address 0x123456 is transmitted as 87</p> 88<div class="smallexample"> 89<pre class="smallexample"><code>123456/d</code> 90</pre></div> 91 92 93 94 95</body> 96</html> 97