161 lines
8.8 KiB
HTML
161 lines
8.8 KiB
HTML
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<html lang="en">
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<head>
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<title>Cygwin Native - Debugging with GDB</title>
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<meta name="description" content="Debugging with GDB">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Native.html#Native" title="Native">
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<link rel="prev" href="DJGPP-Native.html#DJGPP-Native" title="DJGPP Native">
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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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Free Documentation'', with the Front-Cover Texts being ``A GNU Manual,''
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</head>
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<body>
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<div class="node">
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<a name="Cygwin-Native"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Hurd-Native.html#Hurd-Native">Hurd Native</a>,
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Previous: <a rel="previous" accesskey="p" href="DJGPP-Native.html#DJGPP-Native">DJGPP Native</a>,
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Up: <a rel="up" accesskey="u" href="Native.html#Native">Native</a>
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<hr>
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</div>
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<h4 class="subsection">21.1.4 Features for Debugging MS Windows PE Executables</h4>
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<p><a name="index-MS-Windows-debugging-1503"></a><a name="index-native-Cygwin-debugging-1504"></a><a name="index-Cygwin_002dspecific-commands-1505"></a>
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<span class="sc">gdb</span> supports native debugging of MS Windows programs, including
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DLLs with and without symbolic debugging information.
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<p><a name="index-Ctrl_002dBREAK_002c-MS_002dWindows-1506"></a><a name="index-interrupt-debuggee-on-MS_002dWindows-1507"></a>MS-Windows programs that call <code>SetConsoleMode</code> to switch off the
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special meaning of the ‘<samp><span class="samp">Ctrl-C</span></samp>’ keystroke cannot be interrupted
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by typing <kbd>C-c</kbd>. For this reason, <span class="sc">gdb</span> on MS-Windows
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supports <kbd>C-<BREAK></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>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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<a name="index-info-w32-1508"></a>
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<dl><dt><code>info w32</code><dd>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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<br><dt><code>info w32 selector</code><dd>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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<br><dt><code>info w32 thread-information-block</code><dd>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><a name="index-signal_002devent-1509"></a><br><dt><code>signal-event </code><var>id</var><dd>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>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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<ul>
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<li><code>Debugger</code> (REG_SZ) — a command to launch the debugger.
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Suggested command is: <var>fully-qualified-path-to-gdb.exe</var><code> -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 <span class="sc">gdb</span>
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to attach.
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<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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</ul>
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<p><a name="index-set-cygwin_002dexceptions-1510"></a><a name="index-debugging-the-Cygwin-DLL-1511"></a><a name="index-Cygwin-DLL_002c-debugging-1512"></a><br><dt><code>set cygwin-exceptions </code><var>mode</var><dd>If <var>mode</var> is <code>on</code>, <span class="sc">gdb</span> 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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<span class="sc">gdb</span> 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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<span class="sc">gdb</span> users with false <code>SIGSEGV</code> signals.
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<p><a name="index-show-cygwin_002dexceptions-1513"></a><br><dt><code>show cygwin-exceptions</code><dd>Displays whether <span class="sc">gdb</span> will break on exceptions that happen
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inside the Cygwin DLL itself.
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<p><a name="index-set-new_002dconsole-1514"></a><br><dt><code>set new-console </code><var>mode</var><dd>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><a name="index-show-new_002dconsole-1515"></a><br><dt><code>show new-console</code><dd>Displays whether a new console is used
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when the debuggee is started.
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<p><a name="index-set-new_002dgroup-1516"></a><br><dt><code>set new-group </code><var>mode</var><dd>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><span class="samp">Ctrl-C</span></samp>’.
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<p><a name="index-show-new_002dgroup-1517"></a><br><dt><code>show new-group</code><dd>Displays current value of new-group boolean.
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<p><a name="index-set-debugevents-1518"></a><br><dt><code>set debugevents</code><dd>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><a name="index-set-debugexec-1519"></a><br><dt><code>set debugexec</code><dd>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><a name="index-set-debugexceptions-1520"></a><br><dt><code>set debugexceptions</code><dd>This boolean value adds debug output concerning exceptions in the
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debuggee seen by the debugger.
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<p><a name="index-set-debugmemory-1521"></a><br><dt><code>set debugmemory</code><dd>This boolean value adds debug output concerning debuggee memory reads
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and writes by the debugger.
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<p><a name="index-set-shell-1522"></a><br><dt><code>set shell</code><dd>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><a name="index-show-shell-1523"></a><br><dt><code>show shell</code><dd>Displays if the debuggee will be started with a shell.
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</dl>
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<ul class="menu">
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<li><a accesskey="1" href="Non_002ddebug-DLL-Symbols.html#Non_002ddebug-DLL-Symbols">Non-debug DLL Symbols</a>: Support for DLLs without debugging symbols
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</ul>
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</body></html>
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