linux/lib/Kconfig.kgdb
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   1
   2config HAVE_ARCH_KGDB
   3        bool
   4
   5menuconfig KGDB
   6        bool "KGDB: kernel debugger"
   7        depends on HAVE_ARCH_KGDB
   8        depends on DEBUG_KERNEL
   9        help
  10          If you say Y here, it will be possible to remotely debug the
  11          kernel using gdb.  It is recommended but not required, that
  12          you also turn on the kernel config option
  13          CONFIG_FRAME_POINTER to aid in producing more reliable stack
  14          backtraces in the external debugger.  Documentation of
  15          kernel debugger is available at http://kgdb.sourceforge.net
  16          as well as in DocBook form in Documentation/DocBook/.  If
  17          unsure, say N.
  18
  19if KGDB
  20
  21config KGDB_SERIAL_CONSOLE
  22        tristate "KGDB: use kgdb over the serial console"
  23        select CONSOLE_POLL
  24        select MAGIC_SYSRQ
  25        depends on TTY && HW_CONSOLE
  26        default y
  27        help
  28          Share a serial console with kgdb. Sysrq-g must be used
  29          to break in initially.
  30
  31config KGDB_TESTS
  32        bool "KGDB: internal test suite"
  33        default n
  34        help
  35          This is a kgdb I/O module specifically designed to test
  36          kgdb's internal functions.  This kgdb I/O module is
  37          intended to for the development of new kgdb stubs
  38          as well as regression testing the kgdb internals.
  39          See the drivers/misc/kgdbts.c for the details about
  40          the tests.  The most basic of this I/O module is to boot
  41          a kernel boot arguments "kgdbwait kgdbts=V1F100"
  42
  43config KGDB_TESTS_ON_BOOT
  44        bool "KGDB: Run tests on boot"
  45        depends on KGDB_TESTS
  46        default n
  47        help
  48          Run the kgdb tests on boot up automatically without the need
  49          to pass in a kernel parameter
  50
  51config KGDB_TESTS_BOOT_STRING
  52        string "KGDB: which internal kgdb tests to run"
  53        depends on KGDB_TESTS_ON_BOOT
  54        default "V1F100"
  55        help
  56          This is the command string to send the kgdb test suite on
  57          boot.  See the drivers/misc/kgdbts.c for detailed
  58          information about other strings you could use beyond the
  59          default of V1F100.
  60
  61config KGDB_LOW_LEVEL_TRAP
  62       bool "KGDB: Allow debugging with traps in notifiers"
  63       depends on X86 || MIPS
  64       default n
  65       help
  66         This will add an extra call back to kgdb for the breakpoint
  67         exception handler which will allow kgdb to step through a
  68         notify handler.
  69
  70config KGDB_KDB
  71        bool "KGDB_KDB: include kdb frontend for kgdb"
  72        default n
  73        help
  74          KDB frontend for kernel
  75
  76config KDB_DEFAULT_ENABLE
  77        hex "KDB: Select kdb command functions to be enabled by default"
  78        depends on KGDB_KDB
  79        default 0x1
  80        help
  81          Specifiers which kdb commands are enabled by default. This may
  82          be set to 1 or 0 to enable all commands or disable almost all
  83          commands.
  84
  85          Alternatively the following bitmask applies:
  86
  87            0x0002 - allow arbitrary reads from memory and symbol lookup
  88            0x0004 - allow arbitrary writes to memory
  89            0x0008 - allow current register state to be inspected
  90            0x0010 - allow current register state to be modified
  91            0x0020 - allow passive inspection (backtrace, process list, lsmod)
  92            0x0040 - allow flow control management (breakpoint, single step)
  93            0x0080 - enable signalling of processes
  94            0x0100 - allow machine to be rebooted
  95
  96          The config option merely sets the default at boot time. Both
  97          issuing 'echo X > /sys/module/kdb/parameters/cmd_enable' or
  98          setting with kdb.cmd_enable=X kernel command line option will
  99          override the default settings.
 100
 101config KDB_KEYBOARD
 102        bool "KGDB_KDB: keyboard as input device"
 103        depends on VT && KGDB_KDB
 104        default n
 105        help
 106          KDB can use a PS/2 type keyboard for an input device
 107
 108config KDB_CONTINUE_CATASTROPHIC
 109        int "KDB: continue after catastrophic errors"
 110        depends on KGDB_KDB
 111        default "0"
 112        help
 113          This integer controls the behaviour of kdb when the kernel gets a
 114          catastrophic error, i.e. for a panic or oops.
 115          When KDB is active and a catastrophic error occurs, nothing extra
 116          will happen until you type 'go'.
 117          CONFIG_KDB_CONTINUE_CATASTROPHIC == 0 (default). The first time
 118          you type 'go', you will be warned by kdb. The secend time you type
 119          'go', KDB tries to continue. No guarantees that the
 120          kernel is still usable in this situation.
 121          CONFIG_KDB_CONTINUE_CATASTROPHIC == 1. KDB tries to continue.
 122          No guarantees that the kernel is still usable in this situation.
 123          CONFIG_KDB_CONTINUE_CATASTROPHIC == 2. KDB forces a reboot.
 124          If you are not sure, say 0.
 125
 126endif # KGDB
 127