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authorClément Chigot <clement.chigot@atos.net>2021-03-11 11:08:19 +0100
committerAlan Modra <amodra@gmail.com>2021-03-12 22:47:33 +1030
commit1b2cb8e2ee578e68389c9201bfdfa8cd67c3b416 (patch)
tree9eb377958bf1f1c763cca583f314a8dc9d9249c6 /bfd/xcofflink.c
parent4a403be0c1b4540e22c8c608ea0bfecbf0f85e51 (diff)
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aix: implement TLS relocation for gas and ld
Add support for TLS in XCOFF. Amongst the things done by this commit: - Update XCOFF auxialiary header to match new version and allow TLS sections. - Add TLS sections (.tdata and .tbss) support in gas and ld. - Add support for the TLS relocations in gas and ld. Two different types BFD_RELOC are created for PPC and PPC64 as the size is a pointer, thus distinct in 32 or 64bit. The addresses given by ld to .tdata and .tbss is a bit special. In XCOFF, these addresses are actually offsets from the TLS pointer computed at runtime. AIX assembly and linker does the same. In top of that, the .tdata must be before .data (this is mandatory for AIX loader). Thus, the aix ld script is recomputing "." before .data to restore its original value. There might be a simpler way, but this one is working. Optimisation linked to TLS relocations aren't yet implemented. bfd/ * reloc.c (BFD_RELOC_PPC_TLS_LE, BFD_RELOC_PPC_TLS_IE, BFD_RELOC_PPC_TLS_M, BFD_RELOC_PPC_TLS_ML, BFD_RELOC_PPC64_TLS_GD, BFD_RELOC_PPC64_TLS_LD, BFD_RELOC_PPC64_TLS_LE, BFD_RELOC_PPC64_TLS_IE, BFD_RELOC_PPC64_TLS_M, BFD_RELOC_PPC64_TLS_ML): New relocations. * bfd-in2.h: Regenerate. * libbfd.h: Regenerate. * coff-rs6000.c (xcoff_calculate_relocation): Call xcoff_reloc_type_tls for TLS relocations. (xcoff_howto_table): Implement TLS relocations. (_bfd_xcoff_reloc_type_lookup): Add cases TLS relocations. (xcoff_reloc_type_tls): New function. * coff64-rs6000.c (xcoff_calculate_relocation): Likewise. (xcoff_howto_table): Likewise. (_bfd_xcoff_reloc_type_lookup): Likewise. * coffcode.h (sec_to_styp_flags): Handle TLS sections. (styp_to_sec_flags): Likewise. (coff_compute_section_file_positions): Avoid file offset optimisation for .data when the previous section is .tdata. (coff_write_object_contents): Handle TLS sections. * coffswap.h (coff_swap_aouthdr_out): Add support for new fields in aouthdr. * libxcoff.h (xcoff_reloc_type_tls): Add prototype. * xcofflink.c (xcoff_link_add_symbols): Handle XMC_UL. (xcoff_need_ldrel_p): Add cases for TLS relocations. (xcoff_create_ldrel): Add l_symndx for TLS sections. gas/ * config/tc-ppc.c (ppc_xcoff_text_section, ppc_xcoff_data_section, (ppc_xcoff_bss_section, ppc_xcoff_tdata_section, (ppc_xcoff_tbss_section): New variables. (ppc_text_subsegment, ppc_text_csects, ppc_data_subgments, (ppc_data_csects): Removed. (ppc_xcoff_section_is_initialized, ppc_init_xcoff_section, ppc_xcoff_parse_cons): New functions. (md_being): Initialize XCOFF sections. (ppc_xcoff_suffix): Add support for TLS relocations (fixup_size, md_apply_fix): Add support for new BFD_RELOC. (ppc_change_csect): Handle XMC_TL, XMC_UL. Correctly, add XMC_BS to .bss section. Handle new XCOFF section variables. (ppc_comm): Likewise. (ppc_toc): Likewise. (ppc_symbol_new_hook): Likewise. (ppc_frob_symbol): Likewise. (ppc_fix_adjustable): Add tbss support. * config/tc-ppc.h (TC_PARSE_CONS_EXPRESSION): New define. (ppc_xcoff_parse_cons): Add prototype. (struct ppc_xcoff_section): New structure. ld/ * emultempl/aix.em: Ensure .tdata section is removed if empty, even with -r flag. * scripttempl/aix.sc: Handle TLS sections. * testsuite/ld-powerpc/aix52.exp: Add new tests. * testsuite/ld-powerpc/aix-tls-reloc-32.d: New test. * testsuite/ld-powerpc/aix-tls-reloc-64.d: New test. * testsuite/ld-powerpc/aix-tls-reloc.ex: New test. * testsuite/ld-powerpc/aix-tls-reloc.s: New test. * testsuite/ld-powerpc/aix-tls-section-32.d: New test. * testsuite/ld-powerpc/aix-tls-section-64.d: New test. * testsuite/ld-powerpc/aix-tls-section.ex: New test. * testsuite/ld-powerpc/aix-tls-section.s: New test. include/ * coff/internal.h (struct internal_aouthdr): Add new fields. * coff/rs6000.h (AOUTHDRÃ): Add new fields. * coff/rs6k64.h (struct external_filehdr): Likewise. * coff/xcoff.h (_TDATA), _TBSS): New defines (RS6K_AOUTHDR_TLS_LE, RS6K_AOUTHDR_RAS, RS6K_AOUTHDR_ALGNTDATA, RS6K_AOUTHDR_SHR_SYMTAB, RS6K_AOUTHDR_FORK_POLICY, RS6K_AOUTHDR_FORK_COR): New defines. (XMC_TU): Removed. (XMC_UL): New define.
Diffstat (limited to 'bfd/xcofflink.c')
-rw-r--r--bfd/xcofflink.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/bfd/xcofflink.c b/bfd/xcofflink.c
index f0d6c8d..f0dd0e9 100644
--- a/bfd/xcofflink.c
+++ b/bfd/xcofflink.c
@@ -1814,6 +1814,12 @@ xcoff_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
csect = bfd_make_section_anyway_with_flags (abfd, ".td",
SEC_ALLOC);
}
+ else if (aux.x_csect.x_smclas == XMC_UL)
+ {
+ /* This is a thread-local unitialized csect. */
+ csect = bfd_make_section_anyway_with_flags (abfd, ".tbss",
+ SEC_ALLOC | SEC_THREAD_LOCAL);
+ }
else
csect = bfd_make_section_anyway_with_flags (abfd, ".bss",
SEC_ALLOC);
@@ -2697,6 +2703,14 @@ xcoff_need_ldrel_p (struct bfd_link_info *info, struct internal_reloc *rel,
return FALSE;
}
return TRUE;
+
+ case R_TLS:
+ case R_TLS_LE:
+ case R_TLS_IE:
+ case R_TLS_LD:
+ case R_TLSM:
+ case R_TLSML:
+ return TRUE;
}
}
@@ -4060,6 +4074,10 @@ xcoff_create_ldrel (bfd *output_bfd, struct xcoff_final_link_info *flinfo,
ldrel.l_symndx = 1;
else if (strcmp (secname, ".bss") == 0)
ldrel.l_symndx = 2;
+ else if (strcmp (secname, ".tdata") == 0)
+ ldrel.l_symndx = -1;
+ else if (strcmp (secname, ".tbss") == 0)
+ ldrel.l_symndx = -2;
else
{
_bfd_error_handler