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| <title>Debugging with GDB: Cygwin Native</title> |
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| <a name="Features-for-Debugging-MS-Windows-PE-Executables"></a> |
| <h4 class="subsection">21.1.5 Features for Debugging MS Windows PE Executables</h4> |
| <a name="index-MS-Windows-debugging"></a> |
| <a name="index-native-Cygwin-debugging"></a> |
| <a name="index-Cygwin_002dspecific-commands"></a> |
| |
| <p><small>GDB</small> supports native debugging of MS Windows programs, including |
| DLLs with and without symbolic debugging information. |
| </p> |
| <a name="index-Ctrl_002dBREAK_002c-MS_002dWindows"></a> |
| <a name="index-interrupt-debuggee-on-MS_002dWindows"></a> |
| <p>MS-Windows programs that call <code>SetConsoleMode</code> to switch off the |
| special meaning of the ‘<samp>Ctrl-C</samp>’ keystroke cannot be interrupted |
| by typing <kbd>C-c</kbd>. For this reason, <small>GDB</small> on MS-Windows |
| supports <kbd>C-<span class="key">BREAK</span></kbd> as an alternative interrupt key |
| sequence, which can be used to interrupt the debuggee even if it |
| ignores <kbd>C-c</kbd>. |
| </p> |
| <p>There are various additional Cygwin-specific commands, described in |
| this section. Working with DLLs that have no debugging symbols is |
| described in <a href="Non_002ddebug-DLL-Symbols.html#Non_002ddebug-DLL-Symbols">Non-debug DLL Symbols</a>. |
| </p> |
| <dl compact="compact"> |
| <dd><a name="index-info-w32"></a> |
| </dd> |
| <dt><code>info w32</code></dt> |
| <dd><p>This is a prefix of MS Windows-specific commands which print |
| information about the target system and important OS structures. |
| </p> |
| </dd> |
| <dt><code>info w32 selector</code></dt> |
| <dd><p>This command displays information returned by |
| the Win32 API <code>GetThreadSelectorEntry</code> function. |
| It takes an optional argument that is evaluated to |
| a long value to give the information about this given selector. |
| Without argument, this command displays information |
| about the six segment registers. |
| </p> |
| </dd> |
| <dt><code>info w32 thread-information-block</code></dt> |
| <dd><p>This command displays thread specific information stored in the |
| Thread Information Block (readable on the X86 CPU family using <code>$fs</code> |
| selector for 32-bit programs and <code>$gs</code> for 64-bit programs). |
| </p> |
| <a name="index-set-cygwin_002dexceptions"></a> |
| <a name="index-debugging-the-Cygwin-DLL"></a> |
| <a name="index-Cygwin-DLL_002c-debugging"></a> |
| </dd> |
| <dt><code>set cygwin-exceptions <var>mode</var></code></dt> |
| <dd><p>If <var>mode</var> is <code>on</code>, <small>GDB</small> will break on exceptions that |
| happen inside the Cygwin DLL. If <var>mode</var> is <code>off</code>, |
| <small>GDB</small> will delay recognition of exceptions, and may ignore some |
| exceptions which seem to be caused by internal Cygwin DLL |
| “bookkeeping”. This option is meant primarily for debugging the |
| Cygwin DLL itself; the default value is <code>off</code> to avoid annoying |
| <small>GDB</small> users with false <code>SIGSEGV</code> signals. |
| </p> |
| <a name="index-show-cygwin_002dexceptions"></a> |
| </dd> |
| <dt><code>show cygwin-exceptions</code></dt> |
| <dd><p>Displays whether <small>GDB</small> will break on exceptions that happen |
| inside the Cygwin DLL itself. |
| </p> |
| <a name="index-set-new_002dconsole"></a> |
| </dd> |
| <dt><code>set new-console <var>mode</var></code></dt> |
| <dd><p>If <var>mode</var> is <code>on</code> the debuggee will |
| be started in a new console on next start. |
| If <var>mode</var> is <code>off</code>, the debuggee will |
| be started in the same console as the debugger. |
| </p> |
| <a name="index-show-new_002dconsole"></a> |
| </dd> |
| <dt><code>show new-console</code></dt> |
| <dd><p>Displays whether a new console is used |
| when the debuggee is started. |
| </p> |
| <a name="index-set-new_002dgroup"></a> |
| </dd> |
| <dt><code>set new-group <var>mode</var></code></dt> |
| <dd><p>This boolean value controls whether the debuggee should |
| start a new group or stay in the same group as the debugger. |
| This affects the way the Windows OS handles |
| ‘<samp>Ctrl-C</samp>’. |
| </p> |
| <a name="index-show-new_002dgroup"></a> |
| </dd> |
| <dt><code>show new-group</code></dt> |
| <dd><p>Displays current value of new-group boolean. |
| </p> |
| <a name="index-set-debugevents"></a> |
| </dd> |
| <dt><code>set debugevents</code></dt> |
| <dd><p>This boolean value adds debug output concerning kernel events related |
| to the debuggee seen by the debugger. This includes events that |
| signal thread and process creation and exit, DLL loading and |
| unloading, console interrupts, and debugging messages produced by the |
| Windows <code>OutputDebugString</code> API call. |
| </p> |
| <a name="index-set-debugexec"></a> |
| </dd> |
| <dt><code>set debugexec</code></dt> |
| <dd><p>This boolean value adds debug output concerning execute events |
| (such as resume thread) seen by the debugger. |
| </p> |
| <a name="index-set-debugexceptions"></a> |
| </dd> |
| <dt><code>set debugexceptions</code></dt> |
| <dd><p>This boolean value adds debug output concerning exceptions in the |
| debuggee seen by the debugger. |
| </p> |
| <a name="index-set-debugmemory"></a> |
| </dd> |
| <dt><code>set debugmemory</code></dt> |
| <dd><p>This boolean value adds debug output concerning debuggee memory reads |
| and writes by the debugger. |
| </p> |
| <a name="index-set-shell"></a> |
| </dd> |
| <dt><code>set shell</code></dt> |
| <dd><p>This boolean values specifies whether the debuggee is called |
| via a shell or directly (default value is on). |
| </p> |
| <a name="index-show-shell"></a> |
| </dd> |
| <dt><code>show shell</code></dt> |
| <dd><p>Displays if the debuggee will be started with a shell. |
| </p> |
| </dd> |
| </dl> |
| |
| <table class="menu" border="0" cellspacing="0"> |
| <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 |
| </td></tr> |
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