how is the eh_frame section used?

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Perhaps this is too technical to ask on the help list, but I'll give it a shot before posting on the dev list...

I would like to know how the data in the eh_frame section is used during runtime, and why the section changes based on the presence/ absence of the -r flag. (the data section does not change in terms of size or layout between the two products, however the eh_frame section does, and this throws off my extraction of relocation table information; I'm targeting MIPS with elf-format output)

thanks,
  -ethan

FYI, This is related to my previous question:
  http://gcc.gnu.org/ml/gcc-help/2007-04/msg00142.html
where I'm trying to figure out how to extract the relocation table information so that I can use gcc 3.4+ on my vendor's embedded platform.

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