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

# SPDX-License-Identifier: GPL-2.0

config TRACE_IRQFLAGS_SUPPORT
	def_bool y

config SH_STANDARD_BIOS
	bool "Use LinuxSH standard BIOS"
	depends on SUPERH32
	help
	  Say Y here if your target has the gdb-sh-stub
	  package from www.m17n.org (or any conforming standard LinuxSH BIOS)
	  in FLASH or EPROM.  The kernel will use standard BIOS calls during
	  boot for various housekeeping tasks (including calls to read and
	  write characters to a system console, get a MAC address from an
	  on-board Ethernet interface, and shut down the hardware).  Note this
	  does not work with machines with an existing operating system in
	  mask ROM and no flash (WindowsCE machines fall in this category).
	  If unsure, say N.

config STACK_DEBUG
	bool "Check for stack overflows"
	depends on DEBUG_KERNEL && SUPERH32
	help
	  This option will cause messages to be printed if free stack space
	  drops below a certain limit. Saying Y here will add overhead to
	  every function call and will therefore incur a major
	  performance hit. Most users should say N.

config 4KSTACKS
	bool "Use 4Kb for kernel stacks instead of 8Kb"
	depends on DEBUG_KERNEL && (MMU || BROKEN) && !PAGE_SIZE_64KB
	help
	  If you say Y here the kernel will use a 4Kb stacksize for the
	  kernel stack attached to each process/thread. This facilitates
	  running more threads on a system and also reduces the pressure
	  on the VM subsystem for higher order allocations. This option
	  will also use IRQ stacks to compensate for the reduced stackspace.

config IRQSTACKS
	bool "Use separate kernel stacks when processing interrupts"
	depends on DEBUG_KERNEL && SUPERH32 && BROKEN
	help
	  If you say Y here the kernel will use separate kernel stacks
	  for handling hard and soft interrupts.  This can help avoid
	  overflowing the process kernel stacks.

config DUMP_CODE
	bool "Show disassembly of nearby code in register dumps"
	depends on DEBUG_KERNEL && SUPERH32
	default y if DEBUG_BUGVERBOSE
	default n
	help
	  This prints out a code trace of the instructions leading up to
	  the faulting instruction as a debugging aid. As this does grow
	  the kernel in size a bit, most users will want to say N here.

	  Those looking for more verbose debugging output should say Y.

config DWARF_UNWINDER
	bool "Enable the DWARF unwinder for stacktraces"
	select FRAME_POINTER
	depends on SUPERH32
	default n
	help
	  Enabling this option will make stacktraces more accurate, at
	  the cost of an increase in overall kernel size.

config SH_NO_BSS_INIT
	bool "Avoid zeroing BSS (to speed-up startup on suitable platforms)"
	depends on DEBUG_KERNEL
	default n
	help
	  If running in painfully slow environments, such as an RTL
	  simulation or from remote memory via SHdebug, where the memory
	  can already be guaranteed to ber zeroed on boot, say Y.

	  For all other cases, say N. If this option seems perplexing, or
	  you aren't sure, say N.

config SH64_SR_WATCH
	bool "Debug: set SR.WATCH to enable hardware watchpoints and trace"
	depends on SUPERH64

config MCOUNT
	def_bool y
	depends on SUPERH32
	depends on STACK_DEBUG || FUNCTION_TRACER
Commit	Line	Data
b2441318	1	# SPDX-License-Identifier: GPL-2.0
1da177e4	2
afbfb52e	3	config TRACE_IRQFLAGS_SUPPORT
d7ef4fb3	4	def_bool y
afbfb52e	5
1da177e4 LT	6	config SH_STANDARD_BIOS
1da177e4 LT	7	bool "Use LinuxSH standard BIOS"
1a013e2f	8	depends on SUPERH32
1da177e4 LT	9	help
	10	Say Y here if your target has the gdb-sh-stub
	11	package from www.m17n.org (or any conforming standard LinuxSH BIOS)
	12	in FLASH or EPROM. The kernel will use standard BIOS calls during
	13	boot for various housekeeping tasks (including calls to read and
	14	write characters to a system console, get a MAC address from an
	15	on-board Ethernet interface, and shut down the hardware). Note this
	16	does not work with machines with an existing operating system in
	17	mask ROM and no flash (WindowsCE machines fall in this category).
	18	If unsure, say N.
	19
9f14b84a	20	config STACK_DEBUG
d153ea88	21	bool "Check for stack overflows"
5db141a9	22	depends on DEBUG_KERNEL && SUPERH32
d153ea88 PM	23	help
d153ea88 PM	24	This option will cause messages to be printed if free stack space
9f14b84a PM	25	drops below a certain limit. Saying Y here will add overhead to
	26	every function call and will therefore incur a major
	27	performance hit. Most users should say N.
d153ea88	28
a6a31139 PM	29	config 4KSTACKS
a6a31139 PM	30	bool "Use 4Kb for kernel stacks instead of 8Kb"
b817f7e0	31	depends on DEBUG_KERNEL && (MMU \|\| BROKEN) && !PAGE_SIZE_64KB
a6a31139 PM	32	help
	33	If you say Y here the kernel will use a 4Kb stacksize for the
	34	kernel stack attached to each process/thread. This facilitates
	35	running more threads on a system and also reduces the pressure
	36	on the VM subsystem for higher order allocations. This option
	37	will also use IRQ stacks to compensate for the reduced stackspace.
	38
110ed282 PM	39	config IRQSTACKS
110ed282 PM	40	bool "Use separate kernel stacks when processing interrupts"
40c8bca7	41	depends on DEBUG_KERNEL && SUPERH32 && BROKEN
110ed282 PM	42	help
	43	If you say Y here the kernel will use separate kernel stacks
	44	for handling hard and soft interrupts. This can help avoid
	45	overflowing the process kernel stacks.
	46
5d2685d0 PM	47	config DUMP_CODE
	48	bool "Show disassembly of nearby code in register dumps"
	49	depends on DEBUG_KERNEL && SUPERH32
	50	default y if DEBUG_BUGVERBOSE
	51	default n
	52	help
	53	This prints out a code trace of the instructions leading up to
	54	the faulting instruction as a debugging aid. As this does grow
	55	the kernel in size a bit, most users will want to say N here.
	56
	57	Those looking for more verbose debugging output should say Y.
	58
bd353861 MF	59	config DWARF_UNWINDER
	60	bool "Enable the DWARF unwinder for stacktraces"
	61	select FRAME_POINTER
da47f4a3	62	depends on SUPERH32
bd353861 MF	63	default n
	64	help
	65	Enabling this option will make stacktraces more accurate, at
	66	the cost of an increase in overall kernel size.
	67
740a3e67 PM	68	config SH_NO_BSS_INIT
	69	bool "Avoid zeroing BSS (to speed-up startup on suitable platforms)"
	70	depends on DEBUG_KERNEL
	71	default n
	72	help
	73	If running in painfully slow environments, such as an RTL
	74	simulation or from remote memory via SHdebug, where the memory
25985edc	75	can already be guaranteed to ber zeroed on boot, say Y.
740a3e67 PM	76
	77	For all other cases, say N. If this option seems perplexing, or
	78	you aren't sure, say N.
	79
8214d52a PM	80	config SH64_SR_WATCH
8214d52a PM	81	bool "Debug: set SR.WATCH to enable hardware watchpoints and trace"
fe58cac3	82	depends on SUPERH64
8214d52a	83
473d1cf4 PM	84	config MCOUNT
	85	def_bool y
	86	depends on SUPERH32
	87	depends on STACK_DEBUG \|\| FUNCTION_TRACER