1# SPDX-License-Identifier: GPL-2.0 2menu "Kernel hacking" 3 4config TRACE_IRQFLAGS_SUPPORT 5 def_bool y 6 7source "lib/Kconfig.debug" 8 9config SH_STANDARD_BIOS 10 bool "Use LinuxSH standard BIOS" 11 depends on SUPERH32 12 help 13 Say Y here if your target has the gdb-sh-stub 14 package from www.m17n.org (or any conforming standard LinuxSH BIOS) 15 in FLASH or EPROM. The kernel will use standard BIOS calls during 16 boot for various housekeeping tasks (including calls to read and 17 write characters to a system console, get a MAC address from an 18 on-board Ethernet interface, and shut down the hardware). Note this 19 does not work with machines with an existing operating system in 20 mask ROM and no flash (WindowsCE machines fall in this category). 21 If unsure, say N. 22 23config STACK_DEBUG 24 bool "Check for stack overflows" 25 depends on DEBUG_KERNEL && SUPERH32 26 help 27 This option will cause messages to be printed if free stack space 28 drops below a certain limit. Saying Y here will add overhead to 29 every function call and will therefore incur a major 30 performance hit. Most users should say N. 31 32config 4KSTACKS 33 bool "Use 4Kb for kernel stacks instead of 8Kb" 34 depends on DEBUG_KERNEL && (MMU || BROKEN) && !PAGE_SIZE_64KB 35 help 36 If you say Y here the kernel will use a 4Kb stacksize for the 37 kernel stack attached to each process/thread. This facilitates 38 running more threads on a system and also reduces the pressure 39 on the VM subsystem for higher order allocations. This option 40 will also use IRQ stacks to compensate for the reduced stackspace. 41 42config IRQSTACKS 43 bool "Use separate kernel stacks when processing interrupts" 44 depends on DEBUG_KERNEL && SUPERH32 && BROKEN 45 help 46 If you say Y here the kernel will use separate kernel stacks 47 for handling hard and soft interrupts. This can help avoid 48 overflowing the process kernel stacks. 49 50config DUMP_CODE 51 bool "Show disassembly of nearby code in register dumps" 52 depends on DEBUG_KERNEL && SUPERH32 53 default y if DEBUG_BUGVERBOSE 54 default n 55 help 56 This prints out a code trace of the instructions leading up to 57 the faulting instruction as a debugging aid. As this does grow 58 the kernel in size a bit, most users will want to say N here. 59 60 Those looking for more verbose debugging output should say Y. 61 62config DWARF_UNWINDER 63 bool "Enable the DWARF unwinder for stacktraces" 64 select FRAME_POINTER 65 depends on SUPERH32 66 default n 67 help 68 Enabling this option will make stacktraces more accurate, at 69 the cost of an increase in overall kernel size. 70 71config SH_NO_BSS_INIT 72 bool "Avoid zeroing BSS (to speed-up startup on suitable platforms)" 73 depends on DEBUG_KERNEL 74 default n 75 help 76 If running in painfully slow environments, such as an RTL 77 simulation or from remote memory via SHdebug, where the memory 78 can already be guaranteed to ber zeroed on boot, say Y. 79 80 For all other cases, say N. If this option seems perplexing, or 81 you aren't sure, say N. 82 83config SH64_SR_WATCH 84 bool "Debug: set SR.WATCH to enable hardware watchpoints and trace" 85 depends on SUPERH64 86 87config MCOUNT 88 def_bool y 89 depends on SUPERH32 90 depends on STACK_DEBUG || FUNCTION_TRACER 91 92endmenu 93