* x86_64.cc (Target_x86_64::saw_tls_block_reloc_): Remove member.
(Target_x86_64::Relocate::relocate_tls): Replace check for saw_tls_block_reloc_ with test for executable section.
This commit is contained in:
parent
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commit
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@ -1,3 +1,9 @@
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2010-09-14 Cary Coutant <ccoutant@google.com>
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* x86_64.cc (Target_x86_64::saw_tls_block_reloc_): Remove member.
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(Target_x86_64::Relocate::relocate_tls): Replace check for
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saw_tls_block_reloc_ with test for executable section.
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2010-09-12 Cary Coutant <ccoutant@google.com>
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* symtab.h (Symbol::needs_dynamic_reloc): Non-PIC calls from
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@ -420,7 +420,7 @@ class Target_x86_64 : public Target_freebsd<64, false>
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{
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public:
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Relocate()
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: skip_call_tls_get_addr_(false), saw_tls_block_reloc_(false)
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: skip_call_tls_get_addr_(false)
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{ }
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~Relocate()
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@ -511,12 +511,6 @@ class Target_x86_64 : public Target_freebsd<64, false>
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// This is set if we should skip the next reloc, which should be a
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// PLT32 reloc against ___tls_get_addr.
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bool skip_call_tls_get_addr_;
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// This is set if we see a relocation which could load the address
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// of the TLS block. Whether we see such a relocation determines
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// how we handle the R_X86_64_DTPOFF32 relocation, which is used
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// in debugging sections.
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bool saw_tls_block_reloc_;
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};
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// A class which returns the size required for a relocation type,
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@ -2492,18 +2486,29 @@ Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo,
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const Sized_relobj<64, false>* object = relinfo->object;
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const elfcpp::Elf_Xword addend = rela.get_r_addend();
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elfcpp::Shdr<64, false> data_shdr(relinfo->data_shdr);
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bool is_executable = (data_shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0;
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elfcpp::Elf_types<64>::Elf_Addr value = psymval->value(relinfo->object, 0);
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const bool is_final = (gsym == NULL
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? !parameters->options().shared()
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: gsym->final_value_is_known());
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const tls::Tls_optimization optimized_type
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tls::Tls_optimization optimized_type
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= Target_x86_64::optimize_tls_reloc(is_final, r_type);
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switch (r_type)
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{
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case elfcpp::R_X86_64_TLSGD: // Global-dynamic
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this->saw_tls_block_reloc_ = true;
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if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
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{
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// If this code sequence is used in a non-executable section,
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// we will not optimize the R_X86_64_DTPOFF32/64 relocation,
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// on the assumption that it's being used by itself in a debug
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// section. Therefore, in the unlikely event that the code
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// sequence appears in a non-executable section, we simply
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// leave it unoptimized.
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optimized_type = tls::TLSOPT_NONE;
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}
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if (optimized_type == tls::TLSOPT_TO_LE)
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{
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gold_assert(tls_segment != NULL);
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@ -2554,7 +2559,11 @@ Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo,
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case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
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case elfcpp::R_X86_64_TLSDESC_CALL:
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this->saw_tls_block_reloc_ = true;
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if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
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{
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// See above comment for R_X86_64_TLSGD.
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optimized_type = tls::TLSOPT_NONE;
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}
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if (optimized_type == tls::TLSOPT_TO_LE)
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{
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gold_assert(tls_segment != NULL);
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@ -2617,7 +2626,11 @@ Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo,
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break;
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case elfcpp::R_X86_64_TLSLD: // Local-dynamic
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this->saw_tls_block_reloc_ = true;
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if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
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{
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// See above comment for R_X86_64_TLSGD.
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optimized_type = tls::TLSOPT_NONE;
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}
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if (optimized_type == tls::TLSOPT_TO_LE)
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{
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gold_assert(tls_segment != NULL);
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@ -2642,31 +2655,27 @@ Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo,
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break;
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case elfcpp::R_X86_64_DTPOFF32:
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if (optimized_type == tls::TLSOPT_TO_LE)
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{
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// This relocation type is used in debugging information.
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// In that case we need to not optimize the value. If we
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// haven't seen a TLSLD reloc, then we assume we should not
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// optimize this reloc.
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if (this->saw_tls_block_reloc_)
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// In that case we need to not optimize the value. If the
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// section is not executable, then we assume we should not
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// optimize this reloc. See comments above for R_X86_64_TLSGD,
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// R_X86_64_GOTPC32_TLSDESC, R_X86_64_TLSDESC_CALL, and
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// R_X86_64_TLSLD.
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if (optimized_type == tls::TLSOPT_TO_LE && is_executable)
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{
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gold_assert(tls_segment != NULL);
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value -= tls_segment->memsz();
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}
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}
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Relocate_functions<64, false>::rela32(view, value, addend);
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break;
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case elfcpp::R_X86_64_DTPOFF64:
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if (optimized_type == tls::TLSOPT_TO_LE)
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{
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// See R_X86_64_DTPOFF32, just above, for why we test this.
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if (this->saw_tls_block_reloc_)
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// See R_X86_64_DTPOFF32, just above, for why we check for is_executable.
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if (optimized_type == tls::TLSOPT_TO_LE && is_executable)
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{
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gold_assert(tls_segment != NULL);
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value -= tls_segment->memsz();
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}
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}
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Relocate_functions<64, false>::rela64(view, value, addend);
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break;
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