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 select FRAME_POINTER 64 depends on SUPERH32 65 default n 66 help 67 Enabling this option will make stacktraces more accurate, at 68 the cost of an increase in overall kernel size. 69 70config SH_NO_BSS_INIT 71 bool "Avoid zeroing BSS (to speed-up startup on suitable platforms)" 72 depends on DEBUG_KERNEL 73 default n 74 help 75 If running in painfully slow environments, such as an RTL 76 simulation or from remote memory via SHdebug, where the memory 77 can already be guaranteed to ber zeroed on boot, say Y. 78 79 For all other cases, say N. If this option seems perplexing, or 80 you aren't sure, say N. 81 82config SH64_SR_WATCH 83 bool "Debug: set SR.WATCH to enable hardware watchpoints and trace" 84 depends on SUPERH64 85 86config MCOUNT 87 def_bool y 88 depends on SUPERH32 89 depends on STACK_DEBUG || FUNCTION_TRACER 90 91endmenu 92