Info: (gdb) Cygwin Native

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gdb: Cygwin Native

 
 21.1.4 Features for Debugging MS Windows PE Executables
 -------------------------------------------------------
 
 GDB supports native debugging of MS Windows programs, including DLLs
 with and without symbolic debugging information.
 
    MS-Windows programs that call 'SetConsoleMode' to switch off the
 special meaning of the 'Ctrl-C' keystroke cannot be interrupted by
 typing 'C-c'.  For this reason, GDB on MS-Windows supports 'C-<BREAK>'
 as an alternative interrupt key sequence, which can be used to interrupt
 the debuggee even if it ignores 'C-c'.
 
    There are various additional Cygwin-specific commands, described in
 this section.  Working with DLLs that have no debugging symbols is
 described in Non-debug DLL Symbols.
 
 'info w32'
      This is a prefix of MS Windows-specific commands which print
      information about the target system and important OS structures.
 
 'info w32 selector'
      This command displays information returned by the Win32 API
      'GetThreadSelectorEntry' 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.
 
 'info w32 thread-information-block'
      This command displays thread specific information stored in the
      Thread Information Block (readable on the X86 CPU family using
      '$fs' selector for 32-bit programs and '$gs' for 64-bit programs).
 
 'signal-event ID'
      This command signals an event with user-provided ID.  Used to
      resume crashing process when attached to it using MS-Windows JIT
      debugging (AeDebug).
 
      To use it, create or edit the following keys in
      'HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AeDebug' and/or
      'HKLM\SOFTWARE\Wow6432Node\Microsoft\Windows
      NT\CurrentVersion\AeDebug' (for x86_64 versions):
 
         - 'Debugger' (REG_SZ) -- a command to launch the debugger.
           Suggested command is: 'FULLY-QUALIFIED-PATH-TO-GDB.EXE -ex
           "attach %ld" -ex "signal-event %ld" -ex "continue"'.
 
           The first '%ld' will be replaced by the process ID of the
           crashing process, the second '%ld' will be replaced by the ID
           of the event that blocks the crashing process, waiting for GDB
           to attach.
 
         - 'Auto' (REG_SZ) -- either '1' or '0'.  '1' will make the
           system run debugger specified by the Debugger key
           automatically, '0' will cause a dialog box with "OK" and
           "Cancel" buttons to appear, which allows the user to either
           terminate the crashing process (OK) or debug it (Cancel).
 
 'set cygwin-exceptions MODE'
      If MODE is 'on', GDB will break on exceptions that happen inside
      the Cygwin DLL. If MODE is 'off', GDB 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
      'off' to avoid annoying GDB users with false 'SIGSEGV' signals.
 
 'show cygwin-exceptions'
      Displays whether GDB will break on exceptions that happen inside
      the Cygwin DLL itself.
 
 'set new-console MODE'
      If MODE is 'on' the debuggee will be started in a new console on
      next start.  If MODE is 'off', the debuggee will be started in the
      same console as the debugger.
 
 'show new-console'
      Displays whether a new console is used when the debuggee is
      started.
 
 'set new-group MODE'
      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 'Ctrl-C'.
 
 'show new-group'
      Displays current value of new-group boolean.
 
 'set debugevents'
      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 'OutputDebugString' API call.
 
 'set debugexec'
      This boolean value adds debug output concerning execute events
      (such as resume thread) seen by the debugger.
 
 'set debugexceptions'
      This boolean value adds debug output concerning exceptions in the
      debuggee seen by the debugger.
 
 'set debugmemory'
      This boolean value adds debug output concerning debuggee memory
      reads and writes by the debugger.
 
 'set shell'
      This boolean values specifies whether the debuggee is called via a
      shell or directly (default value is on).
 
 'show shell'
      Displays if the debuggee will be started with a shell.
gdb: Cygwin Native

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