gold patch committed: Handle DW_EH_PE_datarel in FDE

[Ian Lance Taylor]

This gold patch adds support for DW_EH_PE_datarel entries in an FDE.
gold needs to know how to handle them in order to support generating the
.eh_frame_hdr section correctly.  gcc will generate DW_EH_PE_datarel on
Solaris and SVR4, because the native assemblers allegedly can not handle
an expression representing the difference between two symbols in
different sections.  For DW_EH_PE_datarel the base of the value will be
the global offset table, meaning that gcc can simply use a GOTOFF
relocation.  Committed to mainline.

Ian


2011-07-01  Ian Lance Taylor  <iant@google.com>

	PR gold/12525
	* ehframe.cc (Eh_frame_hdr::get_fde_pc): Handle DW_EH_PE_datarel.
	Assert if we see DW_EH_PE_indirect.
	* target.h (Target::ehframe_datarel_base): New function.
	(Target::do_ehframe_datarel_base): New target function.
	* i386.cc (Target_i386::do_ehframe_datarel_base): New function.
	* x86_64.cc (Target_x86_64::do_ehframe_datarel_base): New
	function.


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