[arm] Add TARGET2 and PREL31 relocations

[Paul Brook]

The attached patch adds gas, ld and bfd support for the R_ARM_TARGET2 and 
R_ARM_PREL31 relocations. It also add bfd support for R_ARM_GOT_PREL 
relocation.

The R_ARM_TARGET2 relocation maps to either a R_ARM_ABS32 or R_ARM_GOT_PREL 
relocation (or other values in as-yet unsupported targets). We need to know 
which of these the target is using before we scan the input symbols, so that 
we can size the .got section correctly. I moved the setting of th TARGET{1,2} 
meanings from arm_elf_before_allocation to 
arm_elf_create_output_section_statements for this reason.

R_ARM_PREL31 is similar to R_ARM_REL32, but only a 31-bit offset.

Tested with cross to arm-none-elf and building --enable-targets=all.
Ok?

Paul

2004-09-17 Paul Brook  <paul@codesourcery.com>

bfd/
 * bfd-in.h (bfd_elf32_arm_set_target_relocs): Add prototype.
 (bfd_elf32_arm_process_before_allocation): Update prototype.
 * bfd-in2.h: Regenerate.
 * bfd/elf32-arm.h (elf32_arm_link_hash_table): Add target2_reloc.
 (elf32_arm_link_hash_table_create): Set it.
 (bfd_elf32_arm_process_before_allocation): Remove target1_is_rel.
 (bfd_elf32_arm_set_target_relocs): New function.
 (arm_real_reloc_type): New function.
 (elf32_arm_final_link_relocate): Use it.  Handle R_ARM_PREL31 and
 R_ARM_GOT_PREL.  Remove R_ARM_TARGET1.
 (elf32_arm_gc_sweep_hook): Ditto.
 (elf32_arm_check_relocs): Ditto.
 (elf32_arm_relocate_section): Handle R_ARM_GOT_PREL.
 * elfarm-nabi.c (elf32_arm_howto_table): Add R_ARM_PREL31 and
 R_ARM_GOT_TARGET2.
 (elf32_arm_got_prel): New variable.
 (elf32_arm_howto_from_type): New function.
 (elf32_arm_info_to_howto): Use it.
 (elf32_arm_reloc_map): Add BFD_RELOC_ARM_PREL31 and
 BFD_RELOC_ARM_TARGET2.
 * libbfd.h: Regenerate.
 * reloc.c: Add BFD_RELOC_ARM_TARGET2 and BFD_RELOC_ARM_PREL31.
gas/
 * config/tc-arm.c (s_arm_rel31): New funciton.
 (md_pseudo_table): Add .rel31.
 (md_apply_fix3): Handle BFD_RELOC_ARM_TARGET2, 
 BFD_RELOC_32_PCREL and BFD_RELOC_ARM_PREL31.
 (tc_gen_reloc): Handle BFD_RELOC_ARM_PREL31 and BFD_RELOC_ARM_TARGET2.
 (arm_fix_adjustable): Return 0 for BFD_RELOC_ARM_TARGET2.
 (arm_parse_reloc): Add (target2).
gas/testsuite/
 * gas/arm/pic.s: Add (target2).
 * gas/arm/pic.d: Ditto.
include/
 * elf/arm.h: Remove R_ARM_STKCHK and R_ARM_THM_STKCHK.
 Add R_ARM_TARGET2, R_ARM_PREL31, R_ARM_GOT_ABS, R_ARM_GOT_PREL,
 R_ARM_GOT_BREL12, R_ARM_GOTOFF12 and R_ARM_GOTRELAX.
ld/
 * ld.texinfo: Rename arm-specific section.  Document --target*
 * emulparams/armelf_fbsd.sh: Set TARGET2_TYPE.
 * emulparams/armelf_linux.sh: Ditto.
 * emulparams/armelf_nbsd.sh: Ditto.
 * emultempl/armelf.em: Set default for TARGET2_TYPE.
 (target2_type): New variable.
 (arm_elf_before_allocation): Don't pass target1_type.
 (arm_elf_create_output_section_statements): New function.
 (PARSE_AND_LIST_PROLOGUE): Add OPTION_TARGET2.
 (PARSE_AND_LIST_LONGOPTS, PARSE_AND_LIST_OPTIONS): Add --target=.
 (PARSE_AND_LIST_ARGS_CASES): Handle OPTION_TARGET2.
 (LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS): Set.
 * emultempl/armelf_oabi.em (_before_allocation): Remove extra
 argument to bfd_elf32_arm_process_before_allocation.
ld/testsuite/
 * ld-arm/arm-target1-{abs,rel}.d}: New files.
 * ld-arm/arm-target1.s: New file.
 * ld-arm/arm-target2-{,got-}rel.d: New files.
 * ld-arm/arm-target2.s: New file.
 * ld-arm/arm-rel31.d: New files.
 * ld-arm/arm-rel31.s: New files.
 * ld-arm/arm.ld: New file.
 * ld-arm/arm-elf.exp: Add new tests.
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