diff options
| author | Robin Getz <rgetz@blackfin.uclinux.org> | 2008-10-08 16:27:12 +0800 |
|---|---|---|
| committer | Bryan Wu <cooloney@kernel.org> | 2008-10-08 16:27:12 +0800 |
| commit | 0c7a6b2135c1bcb5139ca9ca87f292caafcb9410 (patch) | |
| tree | ee1e8b36a4dba9120035ddac270e63ba91dc649c /arch/blackfin/Kconfig.debug | |
| parent | f4585a08479a730fb809606b8ee327a5398c117c (diff) | |
Blackfin arch: add supporting for double fault debug handling
Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org>
Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Diffstat (limited to 'arch/blackfin/Kconfig.debug')
| -rw-r--r-- | arch/blackfin/Kconfig.debug | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/blackfin/Kconfig.debug b/arch/blackfin/Kconfig.debug index c468624d55f..0afa8981872 100644 --- a/arch/blackfin/Kconfig.debug +++ b/arch/blackfin/Kconfig.debug @@ -22,6 +22,44 @@ config DEBUG_HWERR hardware error interrupts and need to know where they are coming from. +config DEBUG_DOUBLEFAULT + bool "Debug Double Faults" + default n + help + If an exception is caused while executing code within the exception + handler, the NMI handler, the reset vector, or in emulator mode, + a double fault occurs. On the Blackfin, this is a unrecoverable + event. You have two options: + - RESET exactly when double fault occurs. The excepting + instruction address is stored in RETX, where the next kernel + boot will print it out. + - Print debug message. This is much more error prone, although + easier to handle. It is error prone since: + - The excepting instruction is not committed. + - All writebacks from the instruction are prevented. + - The generated exception is not taken. + - The EXCAUSE field is updated with an unrecoverable event + The only way to check this is to see if EXCAUSE contains the + unrecoverable event value at every exception return. By selecting + this option, you are skipping over the faulting instruction, and + hoping things stay together enough to print out a debug message. + + This does add a little kernel code, but is the only method to debug + double faults - if unsure say "Y" + +choice + prompt "Double Fault Failure Method" + default DEBUG_DOUBLEFAULT_PRINT + depends on DEBUG_DOUBLEFAULT + +config DEBUG_DOUBLEFAULT_PRINT + bool "Print" + +config DEBUG_DOUBLEFAULT_RESET + bool "Reset" + +endchoice + config DEBUG_ICACHE_CHECK bool "Check Instruction cache coherency" depends on DEBUG_KERNEL |