[linux-2.6-block.git] / arch / arm64 / Kconfig.debug

menu "Kernel hacking"

source "lib/Kconfig.debug"

config FRAME_POINTER
	bool
	default y

config STRICT_DEVMEM
	bool "Filter access to /dev/mem"
	depends on MMU
	help
	  If this option is disabled, you allow userspace (root) access to all
	  of memory, including kernel and userspace memory. Accidental
	  access to this is obviously disastrous, but specific access can
	  be used by people debugging the kernel.

	  If this option is switched on, the /dev/mem file only allows
	  userspace access to memory mapped peripherals.

	  If in doubt, say Y.

config PID_IN_CONTEXTIDR
	bool "Write the current PID to the CONTEXTIDR register"
	help
	  Enabling this option causes the kernel to write the current PID to
	  the CONTEXTIDR register, at the expense of some additional
	  instructions during context switch. Say Y here only if you are
	  planning to use hardware trace tools with this kernel.

config ARM64_RANDOMIZE_TEXT_OFFSET
	bool "Randomize TEXT_OFFSET at build time"
	help
	  Say Y here if you want the image load offset (AKA TEXT_OFFSET)
	  of the kernel to be randomized at build-time. When selected,
	  this option will cause TEXT_OFFSET to be randomized upon any
	  build of the kernel, and the offset will be reflected in the
	  text_offset field of the resulting Image. This can be used to
	  fuzz-test bootloaders which respect text_offset.

	  This option is intended for bootloader and/or kernel testing
	  only. Bootloaders must make no assumptions regarding the value
	  of TEXT_OFFSET and platforms must not require a specific
	  value.

endmenu
Commit	Line	Data
8c2c3df3 CM	1	menu "Kernel hacking"
	2
	3	source "lib/Kconfig.debug"
	4
	5	config FRAME_POINTER
	6	bool
	7	default y
	8
d253b440 LA	9	config STRICT_DEVMEM
	10	bool "Filter access to /dev/mem"
	11	depends on MMU
	12	help
	13	If this option is disabled, you allow userspace (root) access to all
	14	of memory, including kernel and userspace memory. Accidental
	15	access to this is obviously disastrous, but specific access can
	16	be used by people debugging the kernel.
	17
	18	If this option is switched on, the /dev/mem file only allows
	19	userspace access to memory mapped peripherals.
	20
	21	If in doubt, say Y.
	22
ec45d1cf WD	23	config PID_IN_CONTEXTIDR
	24	bool "Write the current PID to the CONTEXTIDR register"
	25	help
	26	Enabling this option causes the kernel to write the current PID to
	27	the CONTEXTIDR register, at the expense of some additional
	28	instructions during context switch. Say Y here only if you are
	29	planning to use hardware trace tools with this kernel.
	30
da57a369 MR	31	config ARM64_RANDOMIZE_TEXT_OFFSET
	32	bool "Randomize TEXT_OFFSET at build time"
	33	help
	34	Say Y here if you want the image load offset (AKA TEXT_OFFSET)
	35	of the kernel to be randomized at build-time. When selected,
	36	this option will cause TEXT_OFFSET to be randomized upon any
	37	build of the kernel, and the offset will be reflected in the
	38	text_offset field of the resulting Image. This can be used to
	39	fuzz-test bootloaders which respect text_offset.
	40
	41	This option is intended for bootloader and/or kernel testing
	42	only. Bootloaders must make no assumptions regarding the value
	43	of TEXT_OFFSET and platforms must not require a specific
	44	value.
	45
8c2c3df3	46	endmenu