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  1 menu "Kernel hacking"
  4         def_bool y
  6 source "lib/Kconfig.debug"
  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 (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.
 22 config 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.
 31 config 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.
 41 config 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.
 49 config 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.
 59           Those looking for more verbose debugging output should say Y.
 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.
 70 config 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.
 79           For all other cases, say N. If this option seems perplexing, or
 80           you aren't sure, say N.
 82 config SH64_SR_WATCH
 83         bool "Debug: set SR.WATCH to enable hardware watchpoints and trace"
 84         depends on SUPERH64
 86 config MCOUNT
 87         def_bool y
 88         depends on SUPERH32
 89         depends on STACK_DEBUG || FUNCTION_TRACER
 91 endmenu

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