1menu "Kernel hacking"
   4        def_bool y
   6source "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.
  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.
  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.
  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.
  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.
  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.
  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.
  79          For all other cases, say N. If this option seems perplexing, or
  80          you aren't sure, say N.
  82config SH64_SR_WATCH
  83        bool "Debug: set SR.WATCH to enable hardware watchpoints and trace"
  84        depends on SUPERH64
  86config MCOUNT
  87        def_bool y
  88        depends on SUPERH32
  89        depends on STACK_DEBUG || FUNCTION_TRACER
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