diff options
| author | Paul Brook <paul@codesourcery.com> | 2008-02-20 15:17:56 +0000 |
|---|---|---|
| committer | Paul Brook <paul@codesourcery.com> | 2008-02-20 15:17:56 +0000 |
| commit | 845b51d665a3e63aa3a830d1cda6c4803fd35484 (patch) | |
| tree | 1c85c13fa283997ffca62a41a41a73adf7c8a2c5 /ld/ld.texinfo | |
| parent | 40887e1a6e8bc0dfb421662f40c1a2c356c8b36d (diff) | |
| download | gdb-845b51d665a3e63aa3a830d1cda6c4803fd35484.zip gdb-845b51d665a3e63aa3a830d1cda6c4803fd35484.tar.gz gdb-845b51d665a3e63aa3a830d1cda6c4803fd35484.tar.bz2 | |
2008-02-20 Paul Brook <paul@codesourcery.com>
ld/
* emultempl/armelf.em (OPTION_FIX_V4BX_INTERWORKING): Define.
(PARSE_AND_LIST_LONGOPTS): Add fix-v4bx-interworking.
(PARSE_AND_LIST_OPTIONS): Ditto.
(PARSE_AND_LIST_ARGS_CASES): Handle OPTION_FIX_V4BX_INTERWORKING.
* emulparams/armelf.sh (OTHER_TEXT_SECTIONS): Add .v4_bx.
* emulparams/armelf_linux.sh (OTHER_TEXT_SECTIONS): Ditto.
* emulparams/armnto.sh (OTHER_TEXT_SECTIONS): Ditto.
* ld.texinfo: Document --fix-v4bx-interworking.
ld/testsuite/
* ld-arm/armv4-bx.d: New test.
* ld-arm/armv4-bx.s: New test.
* ld-arm/arm.ld: Add .v4bx.
* ld-arm/arm-elf.exp: Add armv4-bx.
gas/testsuite/
* gas/arm/thumb.d: Exclude EABI targets.
* gas/arm/arch4t.d: Exclude EABI targts.
* gas/arm/v4bx.d: New test.
* gas/arm/v4bx.s: New test.
* gas/arm/thumb-eabi.d: New test.
* gas/arm/arch4t-eabi.d: New test.
gas/
* config/tc-arm.c (fix_v4bx): New variable.
(do_bx): Generate V4BX relocations.
(md_assemble): Allow bx on v4 codes when fix_v4bx.
(md_apply_fix): Handle BFD_RELOC_ARM_V4BX.
(tc_gen_reloc): Ditto.
(OPTION_FIX_V4BX): Define.
(md_longopts): Add fix-v4bx.
(md_parse_option): Handle OPTION_FIX_V4BX.
(md_show_usage): Document --fix-v4bx.
* doc/c-arm.texi: Document --fix-v4bx.
bfd/
* reloc.c: Add BFD_RELOC_ARM_V4BX.
* elf32-arm.c (elf32_arm_reloc_map): Add BFD_RELOC_ARM_V4BX.
(ARM_BX_GLUE_SECTION_NAME, ARM_BX_GLUE_SECTION_NAME): Define.
(elf32_arm_link_hash_table): Add bx_glue_size and bx_glue_offset.
Update comment for fix_v4bx.
(elf32_arm_link_hash_table_create): Zero bx_glue_size and
bx_glue_offset.
(ARM_BX_VENEER_SIZE, armbx1_tst_insn, armbx2_moveq_insn,
armbx3_bx_insn): New.
(bfd_elf32_arm_allocate_interworking_sections): Allocate BX veneer
section.
(bfd_elf32_arm_add_glue_sections_to_bfd): Ditto.
(bfd_elf32_arm_process_before_allocation): Record BX veneers.
(record_arm_bx_glue, elf32_arm_bx_glue): New functions.
(elf32_arm_final_link_relocate): Handle BX veneers.
(elf32_arm_output_arch_local_syms): Output mapping symbol for .v4_bx.
* bfd-in2.h: Regenerate.
* libbfd.h: Regenerate.
Diffstat (limited to 'ld/ld.texinfo')
| -rw-r--r-- | ld/ld.texinfo | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/ld/ld.texinfo b/ld/ld.texinfo index 00081da..cda834a 100644 --- a/ld/ld.texinfo +++ b/ld/ld.texinfo @@ -5584,6 +5584,21 @@ linker, which causes v4t @code{BX rM} instructions to be rewritten as In the former case, the switch should not be used, and @samp{R_ARM_V4BX} relocations are ignored. +@cindex FIX_V4BX_INTERWORKING +@kindex --fix-v4bx-interworking +Replace @code{BX rM} instructions identified by @samp{R_ARM_V4BX} +relocations with a branch to the following veneer: + +@smallexample +TST rM, #1 +MOVEQ PC, rM +BX Rn +@end smallexample + +This allows generation of libraries/applications that work on ARMv4 cores +and are still interworking safe. Note that the above veneer clobbers the +condition flags, so may cause incorrect progrm behavior in rare cases. + @cindex USE_BLX @kindex --use-blx The @samp{--use-blx} switch enables the linker to use ARM/Thumb |