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Linux/lib/Kconfig.kgdb

  1 
  2 config HAVE_ARCH_KGDB
  3         bool
  4 
  5 menuconfig 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 
 19 if KGDB
 20 
 21 config KGDB_SERIAL_CONSOLE
 22         tristate "KGDB: use kgdb over the serial console"
 23         select CONSOLE_POLL
 24         select MAGIC_SYSRQ
 25         depends on TTY
 26         default y
 27         help
 28           Share a serial console with kgdb. Sysrq-g must be used
 29           to break in initially.
 30 
 31 config 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 
 43 config 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 
 51 config 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 
 61 config 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 
 70 config KGDB_KDB
 71         bool "KGDB_KDB: include kdb frontend for kgdb"
 72         default n
 73         help
 74           KDB frontend for kernel
 75 
 76 config 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 
101 config 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 
108 config 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 
126 endif # KGDB

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