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