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| author | Michael Eager <eager@eagercon.com> | 2018-04-17 14:47:13 -0700 |
|---|---|---|
| committer | Michael Eager <eager@eagercon.com> | 2018-04-17 14:47:13 -0700 |
| commit | 3f0a5f17d7fe1f3d0911ad67a5993be59983fb00 (patch) | |
| tree | 76261ae8c3c1153a62dc11d955eb7502ef6c8483 /bfd/reloc.c | |
| parent | bedda9aced2b3a8ab05e0fbf1372e394e32afbde (diff) | |
| download | gdb-3f0a5f17d7fe1f3d0911ad67a5993be59983fb00.zip gdb-3f0a5f17d7fe1f3d0911ad67a5993be59983fb00.tar.gz gdb-3f0a5f17d7fe1f3d0911ad67a5993be59983fb00.tar.bz2 | |
[MicroBlaze] PIC data text relative
Andrew Sadek <andrew.sadek.se@gmail.com>
A new implemented feature in GCC Microblaze that allows Position
Independent Code to run using Data Text Relative addressing instead
of using Global Offset Table.
Its aim was to make 'PIC' more efficient and flexible as elf size
excess performance overhead were noticed when using GOT due to the
indirect addressing.
include/ChangeLog:
* bfdlink.h (Add flag): Add new flag @ 'bfd_link_info' struct.
* elf/microblaze.h (Add 3 new relocations):
R_MICROBLAZE_TEXTPCREL_64, R_MICROBLAZE_TEXTREL_64
and R_MICROBLAZE_TEXTREL_32_LO for relax function.
bfd/ChangeLog:
* bfd/reloc.c (2 new BFD relocations):
BFD_RELOC_MICROBLAZE_64_TEXTPCREL &
BFD_RELOC_MICROBLAZE_64_TEXTPCREL
* bfd/bfd-in2.h: Regenerate
* bfd/libbfd.h: Regenerate
* bfd/elf32-microblaze.c (Handle new relocs): define 'HOWTO' of 3
new relocs and handle them in both relocate and relax functions.
(microblaze_elf_reloc_type_lookup): add mapping between for new
bfd relocs.
(microblaze_elf_relocate_section): Handle new relocs in case of
elf relocation.
(microblaze_elf_relax_section): Handle new relocs for elf relaxation.
gas/ChangeLog:
* gas/config/tc-microblaze.c (Handle new relocs directives in
assembler): Handle new relocs from compiler output.
(imm_types): add new imm types for data text relative addressing
TEXT_OFFSET, TEXT_PC_OFFSET
(md_convert_frag): conversion for BFD_RELOC_MICROBLAZE_64_TEXTPCREL,
BFD_RELOC_MICROBLAZE_64_TEXTPCREL
(md_apply_fix): apply fix for BFD_RELOC_MICROBLAZE_64_TEXTPCREL,
BFD_RELOC_MICROBLAZE_64_TEXTPCREL
(md_estimate_size_before_relax): estimate size for
BFD_RELOC_MICROBLAZE_64_TEXTPCREL,
BFD_RELOC_MICROBLAZE_64_TEXTPCREL
(tc_gen_reloc): generate relocations for
BFD_RELOC_MICROBLAZE_64_TEXTPCREL,
BFD_RELOC_MICROBLAZE_64_TEXTPCREL
ld/ChangeLog:
* ld/lexsup.c (Add 2 ld options):
(ld_options): add disable-multiple-abs-defs @ 'ld_options' array
(parse_args): parse new option and pass flag to 'link_info' struct.
* ld/ldlex.h (Add enum): add new enum @ 'option_values' enum.
* ld/ld.texinfo (Add new option): Add description for
'disable-multiple-abs-defs'
* ld/main.c: Initialize flags with false @ 'main'. Handle
disable-multiple-abs-defs @ 'mutiple_definition'.
Diffstat (limited to 'bfd/reloc.c')
| -rw-r--r-- | bfd/reloc.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/bfd/reloc.c b/bfd/reloc.c index 9d86dee..80db0c9 100644 --- a/bfd/reloc.c +++ b/bfd/reloc.c @@ -6906,6 +6906,18 @@ ENUM ENUMDOC This is a 64 bit reloc that stores 32-bit thread pointer relative offset to two words (uses imm instruction). +ENUM + BFD_RELOC_MICROBLAZE_64_TEXTPCREL +ENUMDOC + This is a 64 bit reloc that stores the 32 bit pc relative + value in two words (with an imm instruction). The relocation is + PC-relative offset from start of TEXT. +ENUM + BFD_RELOC_MICROBLAZE_64_TEXTREL +ENUMDOC + This is a 64 bit reloc that stores the 32 bit offset + value in two words (with an imm instruction). The relocation is + relative offset from start of TEXT. ENUM BFD_RELOC_AARCH64_RELOC_START |