1menu "Kernel hacking"
2
3config TRACE_IRQFLAGS_SUPPORT
4	def_bool y
5
6source "lib/Kconfig.debug"
7
8config SH_STANDARD_BIOS
9	bool "Use LinuxSH standard BIOS"
10	depends on SUPERH32
11	help
12	  Say Y here if your target has the gdb-sh-stub
13	  package from www.m17n.org (or any conforming standard LinuxSH BIOS)
14	  in FLASH or EPROM.  The kernel will use standard BIOS calls during
15	  boot for various housekeeping tasks (including calls to read and
16	  write characters to a system console, get a MAC address from an
17	  on-board Ethernet interface, and shut down the hardware).  Note this
18	  does not work with machines with an existing operating system in
19	  mask ROM and no flash (WindowsCE machines fall in this category).
20	  If unsure, say N.
21
22config STACK_DEBUG
23	bool "Check for stack overflows"
24	depends on DEBUG_KERNEL && SUPERH32
25	help
26	  This option will cause messages to be printed if free stack space
27	  drops below a certain limit. Saying Y here will add overhead to
28	  every function call and will therefore incur a major
29	  performance hit. Most users should say N.
30
31config DEBUG_STACK_USAGE
32	bool "Stack utilization instrumentation"
33	depends on DEBUG_KERNEL
34	help
35	  Enables the display of the minimum amount of free stack which each
36	  task has ever had available in the sysrq-T and sysrq-P debug output.
37
38	  This option will slow down process creation somewhat.
39
40config 4KSTACKS
41	bool "Use 4Kb for kernel stacks instead of 8Kb"
42	depends on DEBUG_KERNEL && (MMU || BROKEN) && !PAGE_SIZE_64KB
43	help
44	  If you say Y here the kernel will use a 4Kb stacksize for the
45	  kernel stack attached to each process/thread. This facilitates
46	  running more threads on a system and also reduces the pressure
47	  on the VM subsystem for higher order allocations. This option
48	  will also use IRQ stacks to compensate for the reduced stackspace.
49
50config IRQSTACKS
51	bool "Use separate kernel stacks when processing interrupts"
52	depends on DEBUG_KERNEL && SUPERH32 && BROKEN
53	help
54	  If you say Y here the kernel will use separate kernel stacks
55	  for handling hard and soft interrupts.  This can help avoid
56	  overflowing the process kernel stacks.
57
58config DUMP_CODE
59	bool "Show disassembly of nearby code in register dumps"
60	depends on DEBUG_KERNEL && SUPERH32
61	default y if DEBUG_BUGVERBOSE
62	default n
63	help
64	  This prints out a code trace of the instructions leading up to
65	  the faulting instruction as a debugging aid. As this does grow
66	  the kernel in size a bit, most users will want to say N here.
67
68	  Those looking for more verbose debugging output should say Y.
69
70config DWARF_UNWINDER
71	bool "Enable the DWARF unwinder for stacktraces"
72	select FRAME_POINTER
73	default n
74	help
75	  Enabling this option will make stacktraces more accurate, at
76	  the cost of an increase in overall kernel size.
77
78config SH_NO_BSS_INIT
79	bool "Avoid zeroing BSS (to speed-up startup on suitable platforms)"
80	depends on DEBUG_KERNEL
81	default n
82	help
83	  If running in painfully slow environments, such as an RTL
84	  simulation or from remote memory via SHdebug, where the memory
85	  can already be guaranteed to ber zeroed on boot, say Y.
86
87	  For all other cases, say N. If this option seems perplexing, or
88	  you aren't sure, say N.
89
90config SH64_SR_WATCH
91	bool "Debug: set SR.WATCH to enable hardware watchpoints and trace"
92	depends on SUPERH64
93
94config MCOUNT
95	def_bool y
96	depends on SUPERH32
97	depends on STACK_DEBUG || FUNCTION_TRACER
98
99endmenu
100