| 1 | menu "Kernel hacking" |
| 2 | |
| 3 | config TRACE_IRQFLAGS_SUPPORT |
| 4 | def_bool y |
| 5 | |
| 6 | config DEBUG_VERBOSE |
| 7 | bool "Verbose fault messages" |
| 8 | default y |
| 9 | select PRINTK |
| 10 | help |
| 11 | When a program crashes due to an exception, or the kernel detects |
| 12 | an internal error, the kernel can print a not so brief message |
| 13 | explaining what the problem was. This debugging information is |
| 14 | useful to developers and kernel hackers when tracking down problems, |
| 15 | but mostly meaningless to other people. This is always helpful for |
| 16 | debugging but serves no purpose on a production system. |
| 17 | Most people should say N here. |
| 18 | |
| 19 | config PROTECT_KERNEL |
| 20 | default y |
| 21 | bool 'Enable Kernel range register Protection' |
| 22 | help |
| 23 | Adds code to enable/disable range registers to protect static |
| 24 | kernel code/data from userspace. Currently the ranges covered |
| 25 | do no protect kernel loadable modules or dynamically allocated |
| 26 | kernel data. |
| 27 | |
| 28 | config NO_KERNEL_MSG |
| 29 | bool "Suppress Kernel BUG Messages" |
| 30 | help |
| 31 | Do not output any debug BUG messages within the kernel. |
| 32 | |
| 33 | config EARLY_PRINTK |
| 34 | bool "Use the driver that you selected as console also for early printk (to debug kernel bootup)." |
| 35 | default n |
| 36 | help |
| 37 | If you want to use the serdes driver (console=ttyUS0) for |
| 38 | early printk, you must also supply an additional kernel boot |
| 39 | parameter like this: |
| 40 | |
| 41 | serdes=ioportaddr,irq,clockrate,baud |
| 42 | |
| 43 | For an IP7160RGW eval board, you could use this: |
| 44 | |
| 45 | serdes=0x2004000,61,250000000,57600 |
| 46 | |
| 47 | which will let you see early printk output at 57600 baud. |
| 48 | |
| 49 | config STOP_ON_TRAP |
| 50 | bool "Enable stopping at the LDSR for all traps" |
| 51 | default n |
| 52 | help |
| 53 | Cause the LDSR to stop all threads whenever a trap is about to be serviced |
| 54 | |
| 55 | config STOP_ON_BUG |
| 56 | bool "Enable stopping on failed BUG_ON()" |
| 57 | default n |
| 58 | help |
| 59 | Cause all BUG_ON failures to stop all threads |
| 60 | |
| 61 | config DEBUG_IRQMEASURE |
| 62 | bool "Enable IRQ handler measurements" |
| 63 | default n |
| 64 | help |
| 65 | When enabled each IRQ's min/avg/max times will be printed. If the handler |
| 66 | re-enables interrupt, the times will show the full time including to service |
| 67 | nested interrupts. See /proc/irq_measurements. |
| 68 | |
| 69 | config DEBUG_PCIMEASURE |
| 70 | bool "Enable PCI transaction measurements" |
| 71 | default n |
| 72 | help |
| 73 | When enabled the system will measure the min/avg/max timer for each PCI transactions. |
| 74 | See /proc/pci_measurements. |
| 75 | |
| 76 | config ACCESS_OK_CHECKS_ENABLED |
| 77 | bool "Enable user space access checks" |
| 78 | default n |
| 79 | help |
| 80 | Enabling this check causes the kernel to verify that addresses passed |
| 81 | to the kernel by the user space code are within the processes |
| 82 | address space. On a no-mmu system, this is done by examining the |
| 83 | processes memory data structures (adversly affecting performance) but |
| 84 | ensuring that a process does not ask the kernel to violate another |
| 85 | processes address space. Sadly, the kernel uses access_ok() for |
| 86 | address that are in the kernel which results in a large volume of |
| 87 | false positives. |
| 88 | |
| 89 | choice |
| 90 | prompt "Unaligned Access Support" |
| 91 | default UNALIGNED_ACCESS_ENABLED |
| 92 | help |
| 93 | Kernel / Userspace unaligned access handling. |
| 94 | |
| 95 | config UNALIGNED_ACCESS_ENABLED |
| 96 | bool "Kernel and Userspace" |
| 97 | help |
| 98 | |
| 99 | config UNALIGNED_ACCESS_USERSPACE_ONLY |
| 100 | bool "Userspace Only" |
| 101 | help |
| 102 | |
| 103 | config UNALIGNED_ACCESS_DISABLED |
| 104 | bool "Disabled" |
| 105 | help |
| 106 | |
| 107 | endchoice |
| 108 | |
| 109 | config DEBUG_STACKOVERFLOW |
| 110 | bool "Check for stack overflows" |
| 111 | default n |
| 112 | depends on DEBUG_KERNEL |
| 113 | help |
| 114 | This option will cause messages to be printed if free kernel stack space |
| 115 | drops below a certain limit (THREAD_SIZE /8). |
| 116 | |
| 117 | config DEBUG_STACK_USAGE |
| 118 | bool "Stack utilization instrumentation" |
| 119 | default n |
| 120 | depends on DEBUG_KERNEL |
| 121 | help |
| 122 | Enables the display of the minimum amount of free kernel stack which each |
| 123 | task has ever had available in the sysrq-T and sysrq-P debug output. |
| 124 | |
| 125 | This option will slow down process creation somewhat. |
| 126 | |
| 127 | source "lib/Kconfig.debug" |
| 128 | |
| 129 | endmenu |
| 130 | |
