Re: [Xen-devel] [RFC v1 0/8] x86/init: Linux linker tables

["H. Peter Anvin" <hpa@xxxxxxxxx>]

On 12/17/15 20:25, H. Peter Anvin wrote:
> 
> /* DECLARE_LINKTABLE_RO */
> extern const struct foo tablename[], tablename__end[];
> 
> /* DEFINE_LINKTABLE_RO */
> DECLARE_LINKTABLE_RO(struct foo, tablename);
> 
> const struct
> foo__attribute__((used,section(".rodata.tbl.tablename.0"))) tablename[0];
> 
> const struct
> foo__attribute__((used,section(".rodata.tbl.tablename.999")))
> tablename__end[0];
> 
> /* LINKTABLE_RO */
> static const __typeof__(tablename)
> __attribute__((used,section(".rodata.tbl.tablename.50")))
> __tbl_tablename_12345
> 
> /* LINKTABLE_SIZE */
> ((tablename__end) - (tablename))
> 
> ... and so on for all the possible sections where we may want tables.
> 

Come to think of it, we could even eliminate the need for a DEFINE
entirely if we made the start and end symbols static.  However, this
would generate an awful lot of identical-but-local symbols which
probably would make the linker slower and definitely would bloat the
debug data.

        -hpa



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