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  1. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

  2. <html>

  3. <!-- Copyright (C) 1988-2020 Free Software Foundation, Inc.

  4. 

  5. Permission is granted to copy, distribute and/or modify this document

  6. under the terms of the GNU Free Documentation License, Version 1.3 or

  7. any later version published by the Free Software Foundation; with the

  8. Invariant Sections being "Free Software" and "Free Software Needs

  9. Free Documentation", with the Front-Cover Texts being "A GNU Manual,"

  10. and 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

  13. this GNU Manual.  Buying copies from GNU Press supports the FSF in

  14. developing GNU and promoting software freedom." -->

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  16. <head>

  17. <meta http-equiv="Content-Type" content="text/html; charset=utf-8">

  18. <title>Patching (Debugging with GDB)</title>

  19. 

  20. <meta name="description" content="Patching (Debugging with GDB)">

  21. <meta name="keywords" content="Patching (Debugging with GDB)">

  22. <meta name="resource-type" content="document">

  23. <meta name="distribution" content="global">

  24. <meta name="Generator" content="makeinfo">

  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="Altering.html#Altering" rel="up" title="Altering">

  29. <link href="Compiling-and-Injecting-Code.html#Compiling-and-Injecting-Code" rel="next" title="Compiling and Injecting Code">

  30. <link href="Calling.html#Calling" rel="prev" title="Calling">

  31. <style type="text/css">

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  57. </style>

  58. 

  59. 

  60. </head>

  61. 

  62. <body lang="en">

  63. <a name="Patching"></a>

  64. <div class="header">

  65. <p>

  66. Next: <a href="Compiling-and-Injecting-Code.html#Compiling-and-Injecting-Code" accesskey="n" rel="next">Compiling and Injecting Code</a>, Previous: <a href="Calling.html#Calling" accesskey="p" rel="prev">Calling</a>, Up: <a href="Altering.html#Altering" accesskey="u" rel="up">Altering</a> &nbsp; [<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>

  67. </div>

  68. <hr>

  69. <a name="Patching-Programs"></a>

  70. <h3 class="section">17.6 Patching Programs</h3>

  71. 

  72. <a name="index-patching-binaries"></a>

  73. <a name="index-writing-into-executables"></a>

  74. <a name="index-writing-into-corefiles"></a>

  75. 

  76. <p>By default, <small>GDB</small> opens the file containing your program&rsquo;s

  77. executable code (or the corefile) read-only.  This prevents accidental

  78. alterations to machine code; but it also prevents you from intentionally

  79. patching your program&rsquo;s binary.

  80. </p>

  81. <p>If you&rsquo;d like to be able to patch the binary, you can specify that

  82. explicitly with the <code>set write</code> command.  For example, you might

  83. want to turn on internal debugging flags, or even to make emergency

  84. repairs.

  85. </p>

  86. <dl compact="compact">

  87. <dd><a name="index-set-write"></a>

  88. </dd>

  89. <dt><code>set write on</code></dt>

  90. <dt><code>set write off</code></dt>

  91. <dd><p>If you specify &lsquo;<samp>set write on</samp>&rsquo;, <small>GDB</small> opens executable and

  92. core files for both reading and writing; if you specify <kbd>set write

  93. off</kbd> (the default), <small>GDB</small> opens them read-only.

  94. </p>

  95. <p>If you have already loaded a file, you must load it again (using the

  96. <code>exec-file</code> or <code>core-file</code> command) after changing <code>set

  97. write</code>, for your new setting to take effect.

  98. </p>

  99. </dd>

  100. <dt><code>show write</code></dt>

  101. <dd><a name="index-show-write"></a>

  102. <p>Display whether executable files and core files are opened for writing

  103. as well as reading.

  104. </p></dd>

  105. </dl>

  106. 

  107. 

  108. 

  109. 

  110. </body>

  111. </html>