[arm] Infrastructure for eabi unwinding tables

[Paul Brook]

The attached patch adds features to binutils which are required for arm eabi 
based unwinding tables.

It adds segment relative relocations, a new arm specific section type, and 
linker support for the new sections.

Tested with cross to arm-none-elf.
Ok?

Paul

2004-08-10  Paul Brook  <paul@codesourcery.com>

bfd/
	* elf32-arm.c (elf32_arm_get_roseg_base): New function.
	(elf32_arm_get_rwseg_base): New function.
	(elf32_arm_final_link_relocate): Handle R_ARM_SBREL32 and
	R_ARM_ROSEGREL32.
	(elf32_arm_fake_sections, is_unwind_section_name): New functions.
	(elf32_arm_section_from_shdr): New function.
	(elf_backend_fake_sections, elf_backend_section_from_shdr): Define.
binutils/
	* readelf.c (get_arm_section_type_name): New function.
	(get_section_type_name): Use it.
gas/
	* config/tc-arm.c (arm_elf_change_section): Set elf_linked_to_section.
include/elf/
	* arm.h (SHT_ARM_EXIDX): Define.
	(ELF_STRING_ARM_unwind*): Define.
ld/
	* emulparams/armelf.sh: Define OTHER_READONLY_SECTIONS and
	TEXT_START_SYMBOLS.
ld/testsuite/
	* ld-arm/arm-app-abs32.d: Disassembler may output __text_start.
	* ld-arm/arm-app.d: Disassembler may output __text_start.
	* ld-arm/arm-static-app.d: Disassembler may output __text_start.
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