PowerPC64 __tls_get_addr_desc
authorAlan Modra <amodra@gmail.com>
Mon, 20 Jan 2020 02:08:00 +0000 (12:38 +1030)
committerAlan Modra <amodra@gmail.com>
Wed, 22 Jan 2020 06:44:08 +0000 (17:14 +1030)
commit9e7028aa1e788d666bad91fb20159da6c95bbab1
tree6c11e81207599183a4d222248ca2a26f282db861
parentabc489c64a3137f3751797e8ce60d53a2c432e1d
PowerPC64 __tls_get_addr_desc

This implements register saving and restoring in the __tls_get_addr
call stub, so that when glibc supports the optimized tls call stub gcc
can generate code that assumes only r0, r12 and of course r3 are
changed on a __tls_get_addr call.  When gcc expects __tls_get_addr
calls to preserve registers the call will be to __tls_get_addr_desc,
which will be translated by the linker to a call to __tls_get_addr_opt.

bfd/
* elf64-ppc.h (struct ppc64_elf_params): Add no_tls_get_addr_regsave.
* elf64-ppc.c (struct ppc_link_hash_table): Add tga_desc and
tga_desc_fd.
(is_tls_get_addr): Match tga_desc and tga_desc_df too.
(STDU_R1_0R1, ADDI_R1_R1): Define.
(tls_get_addr_prologue, tls_get_addr_epilogue): New functions.
(ppc64_elf_tls_setup): Set up tga_desc and tga_desc_fd.  Indirect
tga_desc_fd to opt_fd, and tga_desc to opt.  Set
no_tls_get_addr_regsave.
(branch_reloc_hash_match): Add hash3 and hash4.
(ppc64_elf_tls_optimize): Handle tga_desc_fd and tga_desc too.
(ppc64_elf_size_dynamic_sections): Likewise.
(ppc64_elf_relocate_section): Likewise.
(plt_stub_size, build_plt_stub): Likewise.  Size regsave
__tls_get_addr stub.
(build_tls_get_addr_stub): Build regsave __tls_get_addr stub and
eh_frame.
(ppc_size_one_stub): Handle tga_desc_fd and tga_desc too.  Size
eh_frame for regsave __tls_get_addr.
gas/
* config/tc-ppc.c (parse_tls_arg): Handle tls arg for
__tls_get_addr_desc and __tls_get_addr_opt.
ld/
* emultempl/ppc64elf.em (ppc64_opt, PARSE_AND_LIST_LONGOPTS),
(PARSE_AND_LIST_OPTIONS, PARSE_AND_LIST_ARGS_CASES): Support
--tls-get-addr-regsave and --no-tls-get-addr-regsave.
(params): Init new field.
* ld.texi (--tls-get-addr-regsave, --no-tls-get-addr-regsave):
Document.
* testsuite/ld-powerpc/tlsdesc.s,
* testsuite/ld-powerpc/tlsdesc.d,
* testsuite/ld-powerpc/tlsdesc.wf,
* testsuite/ld-powerpc/tlsdesc2.d,
* testsuite/ld-powerpc/tlsdesc2.wf,
* testsuite/ld-powerpc/tlsexenors.d,
* testsuite/ld-powerpc/tlsexenors.r,
* testsuite/ld-powerpc/tlsexers.d,
* testsuite/ld-powerpc/tlsexers.r,
* testsuite/ld-powerpc/tlsexetocnors.d,
* testsuite/ld-powerpc/tlsexetocrs.d,
* testsuite/ld-powerpc/tlsexetocrs.r,
* testsuite/ld-powerpc/tlsopt6.d,
* testsuite/ld-powerpc/tlsopt6.wf: New.
* testsuite/ld-powerpc/powerpc.exp: Run new tests.
23 files changed:
bfd/ChangeLog
bfd/elf64-ppc.c
bfd/elf64-ppc.h
gas/ChangeLog
gas/config/tc-ppc.c
ld/ChangeLog
ld/emultempl/ppc64elf.em
ld/ld.texi
ld/testsuite/ld-powerpc/powerpc.exp
ld/testsuite/ld-powerpc/tlsdesc.d [new file with mode: 0644]
ld/testsuite/ld-powerpc/tlsdesc.s [new file with mode: 0644]
ld/testsuite/ld-powerpc/tlsdesc.wf [new file with mode: 0644]
ld/testsuite/ld-powerpc/tlsdesc2.d [new file with mode: 0644]
ld/testsuite/ld-powerpc/tlsdesc2.wf [new file with mode: 0644]
ld/testsuite/ld-powerpc/tlsexenors.d [new file with mode: 0644]
ld/testsuite/ld-powerpc/tlsexenors.r [new file with mode: 0644]
ld/testsuite/ld-powerpc/tlsexers.d [new file with mode: 0644]
ld/testsuite/ld-powerpc/tlsexers.r [new file with mode: 0644]
ld/testsuite/ld-powerpc/tlsexetocnors.d [new file with mode: 0644]
ld/testsuite/ld-powerpc/tlsexetocrs.d [new file with mode: 0644]
ld/testsuite/ld-powerpc/tlsexetocrs.r [new file with mode: 0644]
ld/testsuite/ld-powerpc/tlsopt6.d [new file with mode: 0644]
ld/testsuite/ld-powerpc/tlsopt6.wf [new file with mode: 0644]