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Re: Patch for ppc _SDA_BASE_ value


   Date: Thu, 23 Mar 2000 01:22:28 +0200
   From: Momchil Velikov <velco@fadata.bg>

   >    +  /* Make sure _SDA_BASE_ and _SDA2_BASE_ are at offset <= 32768 from the
   >    +     beginning of the respective output section.  */
   > 
   > That isn't the right check, though.  What you really want to ensure is
   > that _SDA_BASE_ (_SDA2_BASE_) is at an offset <= 32768 from the start
   > of where the .sdata (.sdata2) section is in the output file.
   > 
   > Consider
   >     .data : { *(.data) *(.sdata) *(.sdata2) }
   > where the input .data sections are larger than 65536 bytes in total.

   I see. How about adding a call to a new backend function, say 
   something like find_suitable_defaults_for_special_symbols(),
   in elf_bfd_final_link(), somewhere before the loop which calls
   elf_link_input_bfd(), which function in the PPC case would
   traverse all the .sdata sections in all the input bfd's,
   get the range [first small data item address, last small data item
   address]
   and put _SDA_BASE_ somewhere in between ?

I think you could do this in size_dynamic_sections.

Ian

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