Re: [XenPPC] [PATCH] Print backtrace on BUG

[Jimi Xenidis <jimix@xxxxxxxxxxxxxx>]

hey Amos,
Please see how __warn() calls backtrace.
Also lets make this a full binding and call it __full_crash that way  
the backtrace will be labeled and useful since the first frames are  
dubious.
-JX
On Sep 20, 2006, at 11:41 PM, Amos Waterland wrote:

> This makes Xen/PPC dump a backtrace when a BUG() is triggered.
>
> Signed-off-by: Amos Waterland <apw@xxxxxxxxxx>
>
> ---
>
>  config.h |   10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff -r 5418062d2da8 xen/include/asm-powerpc/powerpc64/config.h
> --- a/xen/include/asm-powerpc/powerpc64/config.h
> +++ b/xen/include/asm-powerpc/powerpc64/config.h
> @@ -38,7 +38,15 @@
>
>  #ifndef __ASSEMBLY__
>
> -#define FORCE_CRASH() __asm__ __volatile__ ( "trap" )
> +#define FORCE_CRASH 
> ()                                                     \
> +do  
> {                                                                      
>  \
> +    unsigned long sp, lr, pc,  
> tp;                                         \
> +    asm("mr %0, 1" :  
> "=r" (sp));                                          \
> +    asm("mflr %0" :  
> "=r" (lr));                                           \
> +    asm("mflr %0; bl 1f; 1: mflr %1; mtlr %0" : "=r" (tp),  
> "=r" (pc));    \
> +    show_backtrace(sp, lr,  
> pc);                                           \
> +    __asm__ __volatile__  
> ( "trap" );                                      \
> +} while ( 0 )
>
>  #endif /* __ASSEMBLY__ */
>
>
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