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authorAlan Modra <amodra@gmail.com>2018-01-17 14:19:08 +1030
committerAlan Modra <amodra@gmail.com>2018-01-17 18:52:57 +1030
commit1be5d8d3bbec4c9a112114993ac5c85b2b26c4c4 (patch)
treedf7f34ee05bf516ced0b7547c40ea3185087b662 /bfd/elf32-ppc.h
parent9e390558cef76767a98123994c422d0642d86cf8 (diff)
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PowerPC PLT speculative execution barriers
Spectre variant 2 mitigation for PowerPC and PowerPC64. bfd/ * elf32-ppc.c (GLINK_ENTRY_SIZE): Handle speculation barrier. (CRSETEQ, BEQCTRM): Define. (is_nonpic_glink_stub): Don't check bctr. (ppc_elf_link_hash_table_create): Init new ppc_elf_params field. (ppc_elf_relax_section): Size speculation barrier. (output_bctr): New function. (write_glink_stub): Use output_bctr. (ppc_elf_relocate_section): Use output_bctr for long branch stub. (ppc_elf_finish_dynamic_symbol): Likewise. (ppc_elf_finish_dynamic_sections): Use output_bctr. * elf32-ppc.h (struct ppc_elf_params): Add speculate_indirect_jumps. * elf64-ppc.c (CRSETEQ, BEQCTRM, BEQCTRLM): Define. (GLINK_PLTRESOLVE_SIZE): Size speculation barrier. (size_global_entry_stubs): Handle speculation barrier sizing. (plt_stub_size): Likewise. (output_bctr): New function. (build_plt_stub, build_tls_get_addr_stub): Output speculation barrier. (ppc_build_one_stub): Likewise for ppc_stub_plt_branch. (ppc_size_one_stub): Size speculation barrier in ppc_stub_plt_branch. (build_global_entry_stubs): Output speculation barrier. (ppc64_elf_build_stubs): Likewise in __glink_PLTresolve stub. * elf64-ppc.h (struct ppc64_elf_params): Add speculate_indirect_jumps. gold/ * options.h (speculate_indirect_jumps): New option. * powerpc.cc (beqctrm, beqctrlm, crseteq): New insn constants. (output_bctr): New function. (Stub_table::plt_call_size): Add space for speculation barrier. (Stub_table::branch_stub_size): Likewise. (Output_data_glink::pltresolve_size): Likewise. (Stub_table::do_write): Output speculation barriers. ld/ * emultempl/ppc32elf.em (params): Init new field. (OPTION_SPECULATE_INDIRECT_JUMPS): Define. (OPTION_NO_SPECULATE_INDIRECT_JUMPS): Define. (PARSE_AND_LIST_LONGOPTS): Handle new options. (PARSE_AND_LIST_ARGS_CASES): Likewise. (PARSE_AND_LIST_OPTIONS): Likewise. * emultempl/ppc64elf.em (params): Init new field. (OPTION_SPECULATE_INDIRECT_JUMPS): Define. (OPTION_NO_SPECULATE_INDIRECT_JUMPS): Define. (PARSE_AND_LIST_LONGOPTS): Handle --speculate-indirect-jumps. (PARSE_AND_LIST_OPTIONS): Likewise. (PARSE_AND_LIST_ARGS_CASES): Likewise. * ld.texinfo (--no-plt-thread-safe): Correct itemx. (--speculate-indirect-jumps): Document. * testsuite/ld-powerpc/elfv2exe.d, * testsuite/ld-powerpc/elfv2so.d, * testsuite/ld-powerpc/relbrlt.d, * testsuite/ld-powerpc/powerpc.exp: Disable plt alignment and speculation barriers on various tests.
Diffstat (limited to 'bfd/elf32-ppc.h')
-rw-r--r--bfd/elf32-ppc.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/bfd/elf32-ppc.h b/bfd/elf32-ppc.h
index f56d027..8977efa 100644
--- a/bfd/elf32-ppc.h
+++ b/bfd/elf32-ppc.h
@@ -35,6 +35,9 @@ struct ppc_elf_params
/* Set if individual PLT call stubs should be aligned. */
int plt_stub_align;
+ /* Clear if PLT call stubs should use a speculative execution barrier. */
+ int speculate_indirect_jumps;
+
/* Whether to emit symbols for stubs. */
int emit_stub_syms;