[patch] PPC VxWorks Shared Libraries.

[Paul Brook]

The attached patch adds support for VxWorks shared libraries.

These are very similar to i386 VxWorks shared libraries, but not the same as 
ppc sysv shared libraries.

The main changes are special handling of plt and got symbols, inclusion of 
static relocation information for the plt, and a different plt layout.
Non-VxWorks targets should be unaffected.

The testsuite changes are trivial changes to match different BFD vectors.

Tested --enable-targets=all on powerpc-linux and powerpc-vxworks.
Ok?

2005-06-29  Paul Brook  <paul@codesourcery.com>

bfd/
	* config.bfd: Add separate case for ppc-vxworks.
	* configure: Regenerate.
	* configure.in: Include elf-vxworks.lo on ppc targets.
	* elf-vxworks.c (elf_vxworks_final_write_processing): Handle
	.rela.plt.unloaded.
	* elf32-ppc.c: Add VxWorks target vec.	Include elf-vxworks.h.
	(PLT_ENTRY_SIZE, PLT_INITIAL_ENTRY_SIZE, PLT_SLOT_SIZE): Remove.
	(VXWORKS_PLT_ENTRY_SIZE, ppc_elf_vxworks_plt_entry,
	ppc_elf_vxworks_pic_plt_entry, VXWORKS_PLT_INITIAL_ENTRY_SIZE,
	ppc_elf_vxworks_plt0_entry, ppc_elf_vxworks_pic_plt0_entry,
	VXWORKS_PLT_NON_JMP_SLOT_RELOCS, VXWORKS_PLTRESOLVE_RELOCS,
	VXWORKS_PLTRESOLVE_RELOCS_SHLIB): New.
	(ppc_elf_link_hash_table): Add srelplt2, sgotplt, hgot, hplt,
	is_vxworks, plt_entry_size, plt_slot_size, plt_initial_entry_size.
	(ppc_elf_link_hash_table_create): Initialize hadtab plt fields.
	(ppc_elf_create_got): Create .got.plt for VxWorks.
	(ppc_elf_create_dynamic_sections): Create unloaded plt relocation
	section for VxWorks.
	(ppc_elf_select_plt_layout): Handle VxWorks plt format.
	(allocate_got): VxWorks does not need a got header.
	(allocate_dynrelocs): Handle VxWorks plt format.
	(ppc_elf_size_dynamic_sections): Save _G_O_T_ and _P_L_T_ symbols for
	VxWorks.  Handle VxWorks plt/got.
	(ppc_elf_finish_dynamic_sections): Fill in VxWorks plt.
	(ppc_elf_vxworks_special_sections): New.
	(ppc_elf_vxworks_link_hash_table_create,
	ppc_elf_vxworks_add_symbol_hook,
	elf_i386_vxworks_link_output_symbol_hook,
	ppc_elf_vxworks_final_write_processing): New functions.
	* targets.c (bfd_elf32_powerpc_vxworks_vec): Declare.
	(_bfd_target_vector): Use it.
gas/
	* config/tc-ppc.c (ppc_target_format): Add VxWorks.
gas/testsuite/
	* gas/ppc/altivec.d: Match all powerpc target vecs.
	* gas/ppc/booke.d: Ditto.
	* gas/ppc/e500.d: Ditto.
ld/
	* Makefile.am (ALL_EMULATIONS): Add eelf32ppcvxworks.o.
	(eelf32ppcvxworks.o): Add dependencies.
	* Makefile.in: Regenerate.
	* configure.tgt: Add entry for powerpc-vxworks.
	* emulparams/elf32-ppc.c: Mention elf32ppcvxworks.sh in comment.
	* emulparams/elf32ppcvxworks.sh: New file.
	* emultempl/ppc32elf.em (bfd_elf32_powerpc_vxworks_vec): Declare.
	(is_ppc_elf32_vec): New function.
	(ppc_after_open, ppc_before_allocation,
	gld${EMULATION_NAME}_after_allocation): Use it.
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