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 4KSTACKS 32 bool "Use 4Kb for kernel stacks instead of 8Kb" 33 depends on DEBUG_KERNEL && (MMU || BROKEN) && !PAGE_SIZE_64KB 34 help 35 If you say Y here the kernel will use a 4Kb stacksize for the 36 kernel stack attached to each process/thread. This facilitates 37 running more threads on a system and also reduces the pressure 38 on the VM subsystem for higher order allocations. This option 39 will also use IRQ stacks to compensate for the reduced stackspace. 40 41config IRQSTACKS 42 bool "Use separate kernel stacks when processing interrupts" 43 depends on DEBUG_KERNEL && SUPERH32 && BROKEN 44 help 45 If you say Y here the kernel will use separate kernel stacks 46 for handling hard and soft interrupts. This can help avoid 47 overflowing the process kernel stacks. 48 49config DUMP_CODE 50 bool "Show disassembly of nearby code in register dumps" 51 depends on DEBUG_KERNEL && SUPERH32 52 default y if DEBUG_BUGVERBOSE 53 default n 54 help 55 This prints out a code trace of the instructions leading up to 56 the faulting instruction as a debugging aid. As this does grow 57 the kernel in size a bit, most users will want to say N here. 58 59 Those looking for more verbose debugging output should say Y. 60 61config DWARF_UNWINDER 62 bool "Enable the DWARF unwinder for stacktraces" 63 depends on DEBUG_KERNEL 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