Nick Clifton nickc@redhat.com
Mon Apr 4 13:39:00 GMT 2005

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Hi Sergei,

> Well, please correct me if I'm wrong, but I see two problems here.
> 
> 1. The variables should better be of type 'char', otherwise pointer
>    arithmetic in the third parameter to memcpy() will bring wrong
>    result.
> 
> 2. Even then it could be wrong. For example, on PowerPC using SYSV ABI
>    compiler is free to assume the two variables are in the small data
>    section and may generate incorrect assembly and relocation types for
>    the addresses, I'm afraid. Because of this I'd use slightly different
>    approach:
> 
>    extern char __start_of_cacheable_bss[];
>    extern char __end_of_cacheable_bss[];
> 
>    memset (__start_of_cacheable_bss, 0,
>       __end_of_cacheable_bss - __start_of_cacheable_bss);
> 
>    The purpose of using arrays of unknown size is to prevent compiler
>    from assuming anything about the location of the variables.


Good points - thanks for making them.

Cheers
   Nick

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