forked from luck/tmp_suning_uos_patched
9f14b84afd
STACK_DEBUG ties in to mcount in order to do function-granular stack overflow checks as opposed to lazily checking from IRQ context. As the default is nohz, the frequency of overflow checking is too irregular to catch much useful information, and so the mcount approach employed by sparc64 is adopted instead. This kills off the old check entirely from the do_IRQ() path and now adopts CONFIG_MCOUNT instead. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
134 lines
4.8 KiB
Plaintext
134 lines
4.8 KiB
Plaintext
menu "Kernel hacking"
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config TRACE_IRQFLAGS_SUPPORT
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def_bool y
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source "lib/Kconfig.debug"
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config SH_STANDARD_BIOS
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bool "Use LinuxSH standard BIOS"
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depends on SUPERH32
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help
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Say Y here if your target has the gdb-sh-stub
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package from www.m17n.org (or any conforming standard LinuxSH BIOS)
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in FLASH or EPROM. The kernel will use standard BIOS calls during
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boot for various housekeeping tasks (including calls to read and
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write characters to a system console, get a MAC address from an
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on-board Ethernet interface, and shut down the hardware). Note this
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does not work with machines with an existing operating system in
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mask ROM and no flash (WindowsCE machines fall in this category).
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If unsure, say N.
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config EARLY_SCIF_CONSOLE
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bool "Use early SCIF console"
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help
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This enables an early console using a fixed SCIF port. This can
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be used by platforms that are either not running the SH
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standard BIOS, or do not wish to use the BIOS callbacks for the
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serial I/O.
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config EARLY_SCIF_CONSOLE_PORT
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hex
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depends on EARLY_SCIF_CONSOLE
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default "0xa4400000" if CPU_SUBTYPE_SH7712 || CPU_SUBTYPE_SH7705
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default "0xa4430000" if CPU_SUBTYPE_SH7720 || CPU_SUBTYPE_SH7721
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default "0xf8420000" if CPU_SUBTYPE_SH7619
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default "0xff804000" if CPU_SUBTYPE_MXG
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default "0xffc30000" if CPU_SUBTYPE_SHX3
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default "0xffe00000" if CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7763 || \
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CPU_SUBTYPE_SH7722 || CPU_SUBTYPE_SH7366 || \
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CPU_SUBTYPE_SH7343
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default "0xffea0000" if CPU_SUBTYPE_SH7785
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default "0xffeb0000" if CPU_SUBTYPE_SH7786
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default "0xfffe8000" if CPU_SUBTYPE_SH7203
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default "0xfffe9800" if CPU_SUBTYPE_SH7206 || CPU_SUBTYPE_SH7263
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default "0xffe80000" if CPU_SH4
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default "0x00000000"
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config EARLY_PRINTK
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bool "Early printk support"
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depends on SH_STANDARD_BIOS || EARLY_SCIF_CONSOLE
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help
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Say Y here to redirect kernel printk messages to the serial port
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used by the SH-IPL bootloader, starting very early in the boot
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process and ending when the kernel's serial console is initialised.
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This option is only useful porting the kernel to a new machine,
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when the kernel may crash or hang before the serial console is
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initialised. If unsure, say N.
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On devices that are running SH-IPL and want to keep the port
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initialization consistent while not using the BIOS callbacks,
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select both the EARLY_SCIF_CONSOLE and SH_STANDARD_BIOS, using
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the kernel command line option to toggle back and forth.
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config STACK_DEBUG
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bool "Check for stack overflows"
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depends on DEBUG_KERNEL && SUPERH32
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help
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This option will cause messages to be printed if free stack space
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drops below a certain limit. Saying Y here will add overhead to
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every function call and will therefore incur a major
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performance hit. Most users should say N.
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config DEBUG_STACK_USAGE
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bool "Stack utilization instrumentation"
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depends on DEBUG_KERNEL
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help
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Enables the display of the minimum amount of free stack which each
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task has ever had available in the sysrq-T and sysrq-P debug output.
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This option will slow down process creation somewhat.
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config 4KSTACKS
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bool "Use 4Kb for kernel stacks instead of 8Kb"
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depends on DEBUG_KERNEL && (MMU || BROKEN) && !PAGE_SIZE_64KB
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help
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If you say Y here the kernel will use a 4Kb stacksize for the
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kernel stack attached to each process/thread. This facilitates
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running more threads on a system and also reduces the pressure
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on the VM subsystem for higher order allocations. This option
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will also use IRQ stacks to compensate for the reduced stackspace.
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config IRQSTACKS
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bool "Use separate kernel stacks when processing interrupts"
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depends on DEBUG_KERNEL && SUPERH32 && BROKEN
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help
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If you say Y here the kernel will use separate kernel stacks
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for handling hard and soft interrupts. This can help avoid
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overflowing the process kernel stacks.
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config DUMP_CODE
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bool "Show disassembly of nearby code in register dumps"
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depends on DEBUG_KERNEL && SUPERH32
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default y if DEBUG_BUGVERBOSE
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default n
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help
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This prints out a code trace of the instructions leading up to
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the faulting instruction as a debugging aid. As this does grow
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the kernel in size a bit, most users will want to say N here.
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Those looking for more verbose debugging output should say Y.
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config SH_NO_BSS_INIT
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bool "Avoid zeroing BSS (to speed-up startup on suitable platforms)"
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depends on DEBUG_KERNEL
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default n
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help
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If running in painfully slow environments, such as an RTL
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simulation or from remote memory via SHdebug, where the memory
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can already be gauranteed to ber zeroed on boot, say Y.
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For all other cases, say N. If this option seems perplexing, or
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you aren't sure, say N.
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config SH64_SR_WATCH
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bool "Debug: set SR.WATCH to enable hardware watchpoints and trace"
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depends on SUPERH64
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config MCOUNT
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def_bool y
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depends on SUPERH32
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depends on STACK_DEBUG || FUNCTION_TRACER
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endmenu
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