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243 lines
10 KiB
HTML
243 lines
10 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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this GNU Manual. Buying copies from GNU Press supports the FSF in
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developing GNU and promoting software freedom." -->
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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>Cygwin Native (Debugging with GDB)</title>
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<meta name="description" content="Cygwin Native (Debugging with GDB)">
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<meta name="keywords" content="Cygwin Native (Debugging with GDB)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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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="Native.html#Native" rel="up" title="Native">
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<link href="Non_002ddebug-DLL-Symbols.html#Non_002ddebug-DLL-Symbols" rel="next" title="Non-debug DLL Symbols">
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<link href="DJGPP-Native.html#DJGPP-Native" rel="prev" title="DJGPP Native">
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<style type="text/css">
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a.summary-letter {text-decoration: none}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Cygwin-Native"></a>
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<div class="header">
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<p>
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Next: <a href="Hurd-Native.html#Hurd-Native" accesskey="n" rel="next">Hurd Native</a>, Previous: <a href="DJGPP-Native.html#DJGPP-Native" accesskey="p" rel="prev">DJGPP Native</a>, Up: <a href="Native.html#Native" accesskey="u" rel="up">Native</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="Features-for-Debugging-MS-Windows-PE-Executables"></a>
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<h4 class="subsection">21.1.4 Features for Debugging MS Windows PE Executables</h4>
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<a name="index-MS-Windows-debugging"></a>
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<a name="index-native-Cygwin-debugging"></a>
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<a name="index-Cygwin_002dspecific-commands"></a>
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<p><small>GDB</small> supports native debugging of MS Windows programs, including
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DLLs with and without symbolic debugging information.
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</p>
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<a name="index-Ctrl_002dBREAK_002c-MS_002dWindows"></a>
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<a name="index-interrupt-debuggee-on-MS_002dWindows"></a>
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<p>MS-Windows programs that call <code>SetConsoleMode</code> to switch off the
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special meaning of the ‘<samp>Ctrl-C</samp>’ keystroke cannot be interrupted
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by typing <kbd>C-c</kbd>. For this reason, <small>GDB</small> on MS-Windows
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supports <kbd>C-<span class="key">BREAK</span></kbd> as an alternative interrupt key
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sequence, which can be used to interrupt the debuggee even if it
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ignores <kbd>C-c</kbd>.
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</p>
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<p>There are various additional Cygwin-specific commands, described in
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this section. Working with DLLs that have no debugging symbols is
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described in <a href="Non_002ddebug-DLL-Symbols.html#Non_002ddebug-DLL-Symbols">Non-debug DLL Symbols</a>.
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</p>
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<dl compact="compact">
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<dd><a name="index-info-w32"></a>
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</dd>
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<dt><code>info w32</code></dt>
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<dd><p>This is a prefix of MS Windows-specific commands which print
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information about the target system and important OS structures.
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</p>
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</dd>
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<dt><code>info w32 selector</code></dt>
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<dd><p>This command displays information returned by
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the Win32 API <code>GetThreadSelectorEntry</code> function.
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It takes an optional argument that is evaluated to
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a long value to give the information about this given selector.
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Without argument, this command displays information
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about the six segment registers.
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</p>
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</dd>
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<dt><code>info w32 thread-information-block</code></dt>
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<dd><p>This command displays thread specific information stored in the
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Thread Information Block (readable on the X86 CPU family using <code>$fs</code>
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selector for 32-bit programs and <code>$gs</code> for 64-bit programs).
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</p>
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<a name="index-signal_002devent"></a>
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</dd>
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<dt><code>signal-event <var>id</var></code></dt>
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<dd><p>This command signals an event with user-provided <var>id</var>. Used to resume
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crashing process when attached to it using MS-Windows JIT debugging (AeDebug).
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</p>
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<p>To use it, create or edit the following keys in
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<code>HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AeDebug</code> and/or
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<code>HKLM\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\AeDebug</code>
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(for x86_64 versions):
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</p>
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<ul class="no-bullet">
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<li>- <code>Debugger</code> (REG_SZ) — a command to launch the debugger.
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Suggested command is: <code><var>fully-qualified-path-to-gdb.exe</var> -ex
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"attach %ld" -ex "signal-event %ld" -ex "continue"</code>.
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<p>The first <code>%ld</code> will be replaced by the process ID of the
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crashing process, the second <code>%ld</code> will be replaced by the ID of
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the event that blocks the crashing process, waiting for <small>GDB</small>
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to attach.
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</p>
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</li><li>- <code>Auto</code> (REG_SZ) — either <code>1</code> or <code>0</code>. <code>1</code> will
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make the system run debugger specified by the Debugger key
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automatically, <code>0</code> will cause a dialog box with “OK” and
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“Cancel” buttons to appear, which allows the user to either
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terminate the crashing process (OK) or debug it (Cancel).
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</li></ul>
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<a name="index-set-cygwin_002dexceptions"></a>
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<a name="index-debugging-the-Cygwin-DLL"></a>
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<a name="index-Cygwin-DLL_002c-debugging"></a>
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</dd>
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<dt><code>set cygwin-exceptions <var>mode</var></code></dt>
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<dd><p>If <var>mode</var> is <code>on</code>, <small>GDB</small> will break on exceptions that
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happen inside the Cygwin DLL. If <var>mode</var> is <code>off</code>,
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<small>GDB</small> will delay recognition of exceptions, and may ignore some
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exceptions which seem to be caused by internal Cygwin DLL
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“bookkeeping”. This option is meant primarily for debugging the
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Cygwin DLL itself; the default value is <code>off</code> to avoid annoying
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<small>GDB</small> users with false <code>SIGSEGV</code> signals.
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</p>
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<a name="index-show-cygwin_002dexceptions"></a>
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</dd>
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<dt><code>show cygwin-exceptions</code></dt>
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<dd><p>Displays whether <small>GDB</small> will break on exceptions that happen
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inside the Cygwin DLL itself.
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</p>
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<a name="index-set-new_002dconsole"></a>
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</dd>
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<dt><code>set new-console <var>mode</var></code></dt>
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<dd><p>If <var>mode</var> is <code>on</code> the debuggee will
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be started in a new console on next start.
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If <var>mode</var> is <code>off</code>, the debuggee will
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be started in the same console as the debugger.
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</p>
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<a name="index-show-new_002dconsole"></a>
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</dd>
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<dt><code>show new-console</code></dt>
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<dd><p>Displays whether a new console is used
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when the debuggee is started.
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</p>
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<a name="index-set-new_002dgroup"></a>
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</dd>
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<dt><code>set new-group <var>mode</var></code></dt>
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<dd><p>This boolean value controls whether the debuggee should
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start a new group or stay in the same group as the debugger.
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This affects the way the Windows OS handles
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‘<samp>Ctrl-C</samp>’.
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</p>
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<a name="index-show-new_002dgroup"></a>
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</dd>
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<dt><code>show new-group</code></dt>
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<dd><p>Displays current value of new-group boolean.
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</p>
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<a name="index-set-debugevents"></a>
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</dd>
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<dt><code>set debugevents</code></dt>
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<dd><p>This boolean value adds debug output concerning kernel events related
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to the debuggee seen by the debugger. This includes events that
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signal thread and process creation and exit, DLL loading and
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unloading, console interrupts, and debugging messages produced by the
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Windows <code>OutputDebugString</code> API call.
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</p>
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<a name="index-set-debugexec"></a>
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</dd>
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<dt><code>set debugexec</code></dt>
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<dd><p>This boolean value adds debug output concerning execute events
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(such as resume thread) seen by the debugger.
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</p>
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<a name="index-set-debugexceptions"></a>
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</dd>
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<dt><code>set debugexceptions</code></dt>
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<dd><p>This boolean value adds debug output concerning exceptions in the
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debuggee seen by the debugger.
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</p>
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<a name="index-set-debugmemory"></a>
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</dd>
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<dt><code>set debugmemory</code></dt>
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<dd><p>This boolean value adds debug output concerning debuggee memory reads
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and writes by the debugger.
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</p>
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<a name="index-set-shell"></a>
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</dd>
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<dt><code>set shell</code></dt>
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<dd><p>This boolean values specifies whether the debuggee is called
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via a shell or directly (default value is on).
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</p>
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<a name="index-show-shell"></a>
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</dd>
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<dt><code>show shell</code></dt>
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<dd><p>Displays if the debuggee will be started with a shell.
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</p>
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</dd>
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</dl>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="Non_002ddebug-DLL-Symbols.html#Non_002ddebug-DLL-Symbols" accesskey="1">Non-debug DLL Symbols</a>:</td><td> </td><td align="left" valign="top">Support for DLLs without debugging symbols
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</td></tr>
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</table>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Hurd-Native.html#Hurd-Native" accesskey="n" rel="next">Hurd Native</a>, Previous: <a href="DJGPP-Native.html#DJGPP-Native" accesskey="p" rel="prev">DJGPP Native</a>, Up: <a href="Native.html#Native" accesskey="u" rel="up">Native</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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