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