menu "Kernel hacking"
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source "lib/Kconfig.debug"
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config DEBUG_DECOMPRESS_KERNEL
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bool "Using serial port during decompressing kernel"
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depends on DEBUG_KERNEL
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default n
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help
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If you say Y here you will confirm the start and the end of
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decompressing Linux seeing "Uncompressing Linux... " and
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"Ok, booting the kernel.\n" on console.
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config TEST_MISALIGNMENT_HANDLER
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bool "Run tests on the misalignment handler"
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depends on DEBUG_KERNEL
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default n
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help
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If you say Y here the kernel will execute a list of misaligned memory
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accesses to make sure the misalignment handler deals them with
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correctly. If it does not, the kernel will throw a BUG.
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config KPROBES
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bool "Kprobes"
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depends on DEBUG_KERNEL
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help
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Kprobes allows you to trap at almost any kernel address and
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execute a callback function. register_kprobe() establishes
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a probepoint and specifies the callback. Kprobes is useful
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for kernel debugging, non-intrusive instrumentation and testing.
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If in doubt, say "N".
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config GDBSTUB
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bool "Remote GDB kernel debugging"
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depends on DEBUG_KERNEL && DEPRECATED
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select DEBUG_INFO
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select FRAME_POINTER
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help
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If you say Y here, it will be possible to remotely debug the kernel
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using gdb. This enlarges your kernel ELF image disk size by several
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megabytes and requires a machine with more than 16 MB, better 32 MB
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RAM to avoid excessive linking time. This is only useful for kernel
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hackers. If unsure, say N.
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This is deprecated in favour of KGDB and will be removed in a later
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version.
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config GDBSTUB_IMMEDIATE
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bool "Break into GDB stub immediately"
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depends on GDBSTUB
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help
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If you say Y here, GDB stub will break into the program as soon as
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possible, leaving the program counter at the beginning of
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start_kernel() in init/main.c.
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config GDBSTUB_ALLOW_SINGLE_STEP
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bool "Allow software single-stepping in GDB stub"
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depends on GDBSTUB && !SMP && !PREEMPT
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help
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Allow GDB stub to perform software single-stepping through the
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kernel. This doesn't work very well on SMP or preemptible kernels as
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it uses temporary breakpoints to emulate single-stepping.
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config GDB_CONSOLE
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bool "Console output to GDB"
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depends on GDBSTUB
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help
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If you are using GDB for remote debugging over a serial port and
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would like kernel messages to be formatted into GDB $O packets so
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that GDB prints them as program output, say 'Y'.
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config GDBSTUB_DEBUGGING
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bool "Debug GDB stub by messages to serial port"
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depends on GDBSTUB
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help
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This causes debugging messages to be displayed at various points
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during execution of the GDB stub routines. Such messages will be
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displayed on ttyS0 if that isn't the GDB stub's port, or ttySM0
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otherwise.
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config GDBSTUB_DEBUG_ENTRY
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bool "Debug GDB stub entry"
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depends on GDBSTUB_DEBUGGING
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help
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This option causes information to be displayed about entry to or exit
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from the main GDB stub routine.
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config GDBSTUB_DEBUG_PROTOCOL
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bool "Debug GDB stub protocol"
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depends on GDBSTUB_DEBUGGING
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help
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This option causes information to be displayed about the GDB remote
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protocol messages generated exchanged with GDB.
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config GDBSTUB_DEBUG_IO
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bool "Debug GDB stub I/O"
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depends on GDBSTUB_DEBUGGING
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help
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This option causes information to be displayed about GDB stub's
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low-level I/O.
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config GDBSTUB_DEBUG_BREAKPOINT
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bool "Debug GDB stub breakpoint management"
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depends on GDBSTUB_DEBUGGING
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help
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This option causes information to be displayed about GDB stub's
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breakpoint management.
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choice
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prompt "GDB stub port"
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default GDBSTUB_ON_TTYSM0
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depends on GDBSTUB
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help
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Select the serial port used for GDB-stub.
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config GDBSTUB_ON_TTYSM0
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bool "/dev/ttySM0 [SIF0]"
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depends on MN10300_TTYSM0
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select GDBSTUB_ON_TTYSMx
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config GDBSTUB_ON_TTYSM1
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bool "/dev/ttySM1 [SIF1]"
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depends on MN10300_TTYSM1
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select GDBSTUB_ON_TTYSMx
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config GDBSTUB_ON_TTYSM2
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bool "/dev/ttySM2 [SIF2]"
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depends on MN10300_TTYSM2
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select GDBSTUB_ON_TTYSMx
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config GDBSTUB_ON_TTYS0
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bool "/dev/ttyS0"
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select GDBSTUB_ON_TTYSx
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config GDBSTUB_ON_TTYS1
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bool "/dev/ttyS1"
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select GDBSTUB_ON_TTYSx
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endchoice
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config GDBSTUB_ON_TTYSMx
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bool
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depends on GDBSTUB_ON_TTYSM0 || GDBSTUB_ON_TTYSM1 || GDBSTUB_ON_TTYSM2
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default y
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config GDBSTUB_ON_TTYSx
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bool
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depends on GDBSTUB_ON_TTYS0 || GDBSTUB_ON_TTYS1
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default y
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endmenu
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config KERNEL_DEBUGGER
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def_bool y
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depends on GDBSTUB || KGDB
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