[MIPS] Add generation of PLT entries with compact jumps for MIPS R6
authorMatthew Fortune <matthew.fortune@mips.com>
Tue, 14 May 2019 00:03:19 +0000 (17:03 -0700)
committerFaraz Shahbazker <fshahbazker@wavecomp.com>
Tue, 21 May 2019 16:22:28 +0000 (09:22 -0700)
commit3734320dc054bd9f6632607e9e5c901c57450791
tree09ada7b6ef14bf220ce429dbd2d4a0dcd0faa654
parent6467207116c66ff2c58f8bc35cb15b2596f5c457
[MIPS] Add generation of PLT entries with compact jumps for MIPS R6

Add a new option to get the linker to emit PLTs that use compact
branches instead of delay slot branches.

bfd/
* elfxx-mips.c (LA25_BC): New macro.
(mips_elf_link_hash_table)<compact_branches>: New field.
(STUB_JALRC): New macro.
(mipsr6_o32_exec_plt0_entry_compact): New array.
(mipsr6_n32_exec_plt0_entry_compact): Likewise.
(mipsr6_n64_exec_plt0_entry_compact): Likewise.
(mipsr6_exec_plt_entry_compact): Likewise.
(mips_elf_create_la25_stub): Use BC instead of J for stubs
when compact_branches is true.
(_bfd_mips_elf_finish_dynamic_symbol): Choose the compact
PLT for MIPSR6 with compact_branches.  Do not reorder the
compact branches PLT.  Switch the lazy stub for MIPSR6
with compact_branches to use JALRC.
(mips_finish_exec_plt): Choose the compact PLT0 for MIPSR6
when compact_branches is true.
(_bfd_mips_elf_compact_branches): New function.
* elfxx-mips.h (_bfd_mips_elf_compact_branches): New prototype.

ld/
* emultempl/mipself.em (compact_branches): New static variable.
(mips_create_output_section_statements): Call
_bfd_mips_elf_compact_branches.
(PARSE_AND_LIST_PROLOGUE): Add OPTION_COMPACT_BRANCHES and
OPTION_NO_COMPACT_BRANCHES.
(PARSE_AND_LIST_LONGOPTS): Add compact-branches,
no-compact-branches.
(PARSE_AND_LIST_OPTIONS): Add --compact-branches,
--no-compact-branches.
(PARSE_AND_LIST_ARGS_CASES): Handle the above.
* ld.texinfo: Document --compact-branches, --no-compact-branches.
* testsuite/ld-mips-elf/pic-and-nonpic-1-r6.dd: New test.
* testsuite/ld-mips-elf/pic-and-nonpic-1-r6.nd: New test.
* testsuite/ld-mips-elf/pic-and-nonpic-3a-r6.dd: New test.
* testsuite/ld-mips-elf/pic-and-nonpic-3a-r6.gd: New test.
* testsuite/ld-mips-elf/pic-and-nonpic-1a-r6.s: New test source.
* testsuite/ld-mips-elf/pic-and-nonpic-3a-r6.s: New test source.
* testsuite/ld-mips-elf/mips-elf.exp: Run the new tests.
14 files changed:
bfd/ChangeLog
bfd/elfxx-mips.c
bfd/elfxx-mips.h
ld/ChangeLog
ld/emultempl/mipself.em
ld/ld.texi
ld/testsuite/ld-mips-elf/mips-elf.exp
ld/testsuite/ld-mips-elf/pic-and-nonpic-1-r6.dd [new file with mode: 0644]
ld/testsuite/ld-mips-elf/pic-and-nonpic-1-r6.nd [new file with mode: 0644]
ld/testsuite/ld-mips-elf/pic-and-nonpic-1-r6.s [new file with mode: 0644]
ld/testsuite/ld-mips-elf/pic-and-nonpic-1a-r6.s [new file with mode: 0644]
ld/testsuite/ld-mips-elf/pic-and-nonpic-3a-r6.dd [new file with mode: 0644]
ld/testsuite/ld-mips-elf/pic-and-nonpic-3a-r6.gd [new file with mode: 0644]
ld/testsuite/ld-mips-elf/pic-and-nonpic-3a-r6.s [new file with mode: 0644]