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Alan Modra authored
There is a very small but non-zero probability that a stub group contains stubs on one relax pass, but does not on the next. In that case we would get an FDE covering a zero length address range. (Actually, it's even worse. Alignment padding for stubs can mean the address for the non-existent stubs is past the end of the original section to which stubs are attached, and due to the way do_plt_fde_location calculates the length we can get a negative length.) Fixing this properly requires removing the FDE. Also, I have been implementing the __tls_get_addr_opt support for gold, and that stub needs something other than the default FDE. The necessary FDE will depend on the offset to the __tls_get_addr_opt stub, which of course can change during relaxation. That means at the very least, rewriting the FDE on each pass, possibly changing the FDE size. I think that is better done by completely recreating PLT eh_frame FDEs. * ehframe.cc (Fde::operator==): New. (Cie::remove_fde, Eh_frame::remove_ehframe_for_plt): New. * ehframe.h (Fde::operator==): Declare. (Cie::remove_fde, Eh_frame::remove_ehframe_for_plt): Likewise. * layout.cc (Layout::remove_eh_frame_for_plt): New. * layout.h (Layout::remove_eh_frame_for_plt): Declare. * powerpc.cc (Target_powerpc::do_relax): Remove old eh_frame FDEs. (Stub_table::add_eh_frame): Delete eh_frame_added_ condition. Don't add eh_frame for empty stub section. (Stub_table::remove_eh_frame): New.
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