[gold patch committed] Fix x86/x86_64 TLSDESC with -z relro

[Ian Lance Taylor]

The TLSDESC relocations used with -mtls-dialect=gnu2 did not work in
gold when using -z relro.  The problem was that the GOT entries were
created in the regular .got section, which, when using -z relro, is
marked read-only after relocations are complete.  The TLSDESC
relocations are resolved lazily, so attempting to set them while the
program was running failed.  I committed this path to fix the problem by
moving the GOT entries into the .got.plt section.

Ian

2010-08-02  Ian Lance Taylor  <iant@google.com>

	* i386.cc (class Target_i386): Add got_tlsdesc_ field.
	(Target_i386::Target_i386):: Initialize got_tlsdesc_.
	(Target_i386::got_tlsdesc_section): New function.
	(Target_i386::got_section): Create space for GOT entries for
	TLSDESC relocations.
	(Target_i386::Scan::local): Use TLSDESC GOT for unoptimized
	R_386_TLS_GOTDESC.
	(Target_i386::Scan::global): Likewise.
	(Target_i386::Relocate::relocate_tls): Adjust GOT offset when
	using TLSDESC GOT.
	* x86_64.cc (class Target_x86_64): Add got_tlsdesc_ field.
	(Target_x86_64::Target_x86_64):: Initialize got_tlsdesc_.
	(Target_x86_64::got_tlsdesc_section): New function.
	(Target_x86_64::got_section): Create space for GOT entries for
	TLSDESC relocations.
	(Target_x86_64::Scan::local): Use TLSDESC GOT for unoptimized
	R_386_TLS_GOTDESC.
	(Target_x86_64::Scan::global): Likewise.
	(Target_x86_64::Relocate::relocate_tls): Adjust GOT offset when
	using TLSDESC GOT.

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