From Craig Silverstein: improve x86_64 TLS support.
This commit is contained in:
Ian Lance Taylor
parent
e44fcf3bcf
commit
0ffd9845f2
307
gold/x86_64.cc
307
gold/x86_64.cc
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@ -57,7 +57,7 @@ class Output_data_plt_x86_64;
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// http://www.x86-64.org/documentation/abi.pdf
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// TLS info comes from
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// http://people.redhat.com/drepper/tls.pdf
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// http://ia32-abi.googlegroups.com/web/RFC-TLSDESC-x86.txt?gda=kWQJPEQAAACEfYQFX0dubPQ2NuO4whhjkR4HAp8tBMb_I0iuUeQslmG1qiJ7UbTIup-M2XPURDRiZJyPR4BqKR2agJ-5jfT5Ley2_-oiOJ4zLNAGCw24Bg
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// http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt
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class Target_x86_64 : public Sized_target<64, false>
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{
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@ -68,7 +68,7 @@ class Target_x86_64 : public Sized_target<64, false>
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Target_x86_64()
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: Sized_target<64, false>(&x86_64_info),
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got_(NULL), plt_(NULL), got_plt_(NULL), rel_dyn_(NULL),
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got_(NULL), plt_(NULL), got_plt_(NULL), rela_dyn_(NULL),
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copy_relocs_(NULL), dynbss_(NULL)
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{ }
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@ -224,7 +224,7 @@ class Target_x86_64 : public Sized_target<64, false>
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// Get the dynamic reloc section, creating it if necessary.
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Reloc_section*
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rel_dyn_section(Layout*);
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rela_dyn_section(Layout*);
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// Copy a relocation against a global symbol.
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void
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@ -243,7 +243,7 @@ class Target_x86_64 : public Sized_target<64, false>
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// The GOT PLT section.
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Output_data_space* got_plt_;
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// The dynamic reloc section.
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Reloc_section* rel_dyn_;
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Reloc_section* rela_dyn_;
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// Relocs saved to avoid a COPY reloc.
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Copy_relocs<64, false>* copy_relocs_;
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// Space for variables copied with a COPY reloc.
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@ -307,16 +307,16 @@ Target_x86_64::got_section(Symbol_table* symtab, Layout* layout)
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// Get the dynamic reloc section, creating it if necessary.
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Target_x86_64::Reloc_section*
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Target_x86_64::rel_dyn_section(Layout* layout)
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Target_x86_64::rela_dyn_section(Layout* layout)
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{
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if (this->rel_dyn_ == NULL)
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if (this->rela_dyn_ == NULL)
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{
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gold_assert(layout != NULL);
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this->rel_dyn_ = new Reloc_section();
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this->rela_dyn_ = new Reloc_section();
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layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
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elfcpp::SHF_ALLOC, this->rel_dyn_);
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elfcpp::SHF_ALLOC, this->rela_dyn_);
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}
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return this->rel_dyn_;
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return this->rela_dyn_;
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}
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// A class to handle the PLT data.
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@ -624,8 +624,8 @@ Target_x86_64::copy_reloc(const General_options* options,
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// Add the COPY reloc.
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ssym->set_needs_dynsym_entry();
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Reloc_section* rel_dyn = this->rel_dyn_section(layout);
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rel_dyn->add_global(ssym, elfcpp::R_X86_64_COPY, dynbss, offset, 0);
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Reloc_section* rela_dyn = this->rela_dyn_section(layout);
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rela_dyn->add_global(ssym, elfcpp::R_X86_64_COPY, dynbss, offset, 0);
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}
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}
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@ -661,6 +661,14 @@ Target_x86_64::optimize_tls_reloc(bool is_final, int r_type)
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// executable, we can switch to Local-Exec.
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return elfcpp::R_X86_64_TPOFF32;
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case elfcpp::R_X86_64_DTPOFF32:
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// Another Local-Dynamic reloc.
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return elfcpp::R_X86_64_TPOFF32;
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case elfcpp::R_X86_64_DTPOFF64:
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// Another Local-Dynamic reloc.
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return elfcpp::R_X86_64_TPOFF64;
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case elfcpp::R_X86_64_GOTTPOFF:
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// These are Initial-Exec relocs which get the thread offset
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// from the GOT. If we know that we are linking against the
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@ -688,8 +696,8 @@ Target_x86_64::Scan::local(const General_options&,
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Layout* layout,
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Target_x86_64* target,
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Sized_relobj<64, false>* object,
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unsigned int,
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const elfcpp::Rela<64, false>&,
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unsigned int data_shndx,
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const elfcpp::Rela<64, false>& reloc,
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unsigned int r_type,
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const elfcpp::Sym<64, false>&)
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{
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@ -724,6 +732,28 @@ Target_x86_64::Scan::local(const General_options&,
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target->got_section(symtab, layout);
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break;
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case elfcpp::R_X86_64_GOT64:
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case elfcpp::R_X86_64_GOT32:
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case elfcpp::R_X86_64_GOTPCREL64:
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case elfcpp::R_X86_64_GOTPCREL:
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{
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// The symbol requires a GOT entry.
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Output_data_got<64, false>* got = target->got_section(symtab, layout);
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unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info());
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if (got->add_local(object, r_sym))
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{
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// If we are generating a shared object, we need to add a
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// dynamic RELATIVE relocation for this symbol.
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if (parameters->output_is_shared())
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{
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Reloc_section* rela_dyn = target->rela_dyn_section(layout);
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rela_dyn->add_local(object, 0, elfcpp::R_X86_64_RELATIVE,
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data_shndx, reloc.get_r_offset(), 0);
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}
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}
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}
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break;
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case elfcpp::R_X86_64_COPY:
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case elfcpp::R_X86_64_GLOB_DAT:
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case elfcpp::R_X86_64_JUMP_SLOT:
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@ -731,8 +761,6 @@ Target_x86_64::Scan::local(const General_options&,
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// These are outstanding tls relocs, which are unexpected when linking
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case elfcpp::R_X86_64_TPOFF64:
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case elfcpp::R_X86_64_DTPMOD64:
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case elfcpp::R_X86_64_DTPOFF64:
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case elfcpp::R_X86_64_DTPOFF32:
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case elfcpp::R_X86_64_TLSDESC:
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fprintf(stderr, _("%s: %s: unexpected reloc %u in object file\n"),
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program_name, object->name().c_str(), r_type);
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@ -746,17 +774,24 @@ Target_x86_64::Scan::local(const General_options&,
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case elfcpp::R_X86_64_TPOFF32: // TODO(csilvers): correct?
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case elfcpp::R_X86_64_GOTPC32_TLSDESC: // TODO(csilvers): correct?
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case elfcpp::R_X86_64_TLSDESC_CALL: // TODO(csilvers): correct?
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case elfcpp::R_X86_64_DTPOFF32:
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case elfcpp::R_X86_64_DTPOFF64:
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{
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bool output_is_shared = parameters->output_is_shared();
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r_type = Target_x86_64::optimize_tls_reloc(!output_is_shared, r_type);
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switch (r_type)
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{
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case elfcpp::R_X86_64_TPOFF32: // Local-exec
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case elfcpp::R_X86_64_TPOFF64:
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// FIXME: If generating a shared object, we need to copy
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// this relocation into the object.
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gold_assert(!output_is_shared);
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break;
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case elfcpp::R_X86_64_DTPOFF32:
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case elfcpp::R_X86_64_DTPOFF64:
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break;
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case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
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case elfcpp::R_X86_64_TLSGD: // General Dynamic
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case elfcpp::R_X86_64_TLSLD: // Local Dynamic
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@ -770,11 +805,7 @@ Target_x86_64::Scan::local(const General_options&,
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}
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break;
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case elfcpp::R_X86_64_GOT64: // TODO(csilvers): correct?
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case elfcpp::R_X86_64_GOT32:
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case elfcpp::R_X86_64_GOTPCREL64: // TODO(csilvers): correct?
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case elfcpp::R_X86_64_GOTPCREL:
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case elfcpp::R_X86_64_GOTPLT64: // TODO(csilvers): correct?
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case elfcpp::R_X86_64_GOTPLT64:
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case elfcpp::R_X86_64_PLT32:
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case elfcpp::R_X86_64_SIZE32: // TODO(csilvers): correct?
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case elfcpp::R_X86_64_SIZE64: // TODO(csilvers): correct?
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@ -861,9 +892,9 @@ Target_x86_64::Scan::global(const General_options& options,
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// dynamic relocation for it.
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if (!gsym->final_value_is_known())
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{
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Reloc_section* rel_dyn = target->rel_dyn_section(layout);
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rel_dyn->add_global(gsym, elfcpp::R_X86_64_GLOB_DAT, got,
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gsym->got_offset(), 0);
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Reloc_section* rela_dyn = target->rela_dyn_section(layout);
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rela_dyn->add_global(gsym, elfcpp::R_X86_64_GLOB_DAT, got,
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gsym->got_offset(), 0);
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}
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}
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}
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@ -892,8 +923,6 @@ Target_x86_64::Scan::global(const General_options& options,
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// These are outstanding tls relocs, which are unexpected when linking
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case elfcpp::R_X86_64_TPOFF64:
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case elfcpp::R_X86_64_DTPMOD64:
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case elfcpp::R_X86_64_DTPOFF64:
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case elfcpp::R_X86_64_DTPOFF32:
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case elfcpp::R_X86_64_TLSDESC:
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fprintf(stderr, _("%s: %s: unexpected reloc %u in object file\n"),
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program_name, object->name().c_str(), r_type);
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@ -907,17 +936,24 @@ Target_x86_64::Scan::global(const General_options& options,
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case elfcpp::R_X86_64_TPOFF32: // TODO(csilvers): correct?
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case elfcpp::R_X86_64_GOTPC32_TLSDESC: // TODO(csilvers): correct?
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case elfcpp::R_X86_64_TLSDESC_CALL: // TODO(csilvers): correct?
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case elfcpp::R_X86_64_DTPOFF32:
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case elfcpp::R_X86_64_DTPOFF64:
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{
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const bool is_final = gsym->final_value_is_known();
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r_type = 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_TPOFF32: // Local-exec
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case elfcpp::R_X86_64_TPOFF64:
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// FIXME: If generating a shared object, we need to copy
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// this relocation into the object.
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gold_assert(!parameters->output_is_shared());
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break;
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case elfcpp::R_X86_64_DTPOFF32:
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case elfcpp::R_X86_64_DTPOFF64:
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break;
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case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
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case elfcpp::R_X86_64_TLSGD: // General Dynamic
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case elfcpp::R_X86_64_TLSLD: // Local Dynamic
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@ -1000,9 +1036,9 @@ Target_x86_64::do_finalize_sections(Layout* layout)
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odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_RELA);
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}
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if (this->rel_dyn_ != NULL)
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if (this->rela_dyn_ != NULL)
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{
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const Output_data* od = this->rel_dyn_;
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const Output_data* od = this->rela_dyn_;
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odyn->add_section_address(elfcpp::DT_RELA, od);
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odyn->add_section_size(elfcpp::DT_RELASZ, od);
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odyn->add_constant(elfcpp::DT_RELAENT,
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@ -1023,8 +1059,8 @@ Target_x86_64::do_finalize_sections(Layout* layout)
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return;
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if (this->copy_relocs_->any_to_emit())
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{
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Reloc_section* rel_dyn = this->rel_dyn_section(layout);
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this->copy_relocs_->emit(rel_dyn);
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Reloc_section* rela_dyn = this->rela_dyn_section(layout);
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this->copy_relocs_->emit(rela_dyn);
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}
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delete this->copy_relocs_;
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this->copy_relocs_ = NULL;
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@ -1036,7 +1072,7 @@ inline bool
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Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo,
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Target_x86_64* target,
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size_t relnum,
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const elfcpp::Rela<64, false>& rel,
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const elfcpp::Rela<64, false>& rela,
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unsigned int r_type,
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const Sized_symbol<64>* gsym,
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const Symbol_value<64>* psymval,
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@ -1048,11 +1084,11 @@ Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo,
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{
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if (r_type != elfcpp::R_X86_64_PLT32
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|| gsym == NULL
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|| strcmp(gsym->name(), "___tls_get_addr") != 0)
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|| strcmp(gsym->name(), "__tls_get_addr") != 0)
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{
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fprintf(stderr, _("%s: %s: missing expected TLS relocation\n"),
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program_name,
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relinfo->location(relnum, rel.get_r_offset()).c_str());
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relinfo->location(relnum, rela.get_r_offset()).c_str());
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gold_exit(false);
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}
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@ -1071,7 +1107,35 @@ Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo,
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}
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const Sized_relobj<64, false>* object = relinfo->object;
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const elfcpp::Elf_Xword addend = rel.get_r_addend();
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const elfcpp::Elf_Xword addend = rela.get_r_addend();
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// Get the GOT offset if needed.
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bool have_got_offset = false;
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unsigned int got_offset = 0;
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switch (r_type)
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{
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case elfcpp::R_X86_64_GOT32:
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case elfcpp::R_X86_64_GOT64:
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case elfcpp::R_X86_64_GOTPLT64:
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case elfcpp::R_X86_64_GOTPCREL:
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case elfcpp::R_X86_64_GOTPCREL64:
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if (gsym != NULL)
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{
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gold_assert(gsym->has_got_offset());
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got_offset = gsym->got_offset();
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}
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else
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{
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unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info());
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got_offset = object->local_got_offset(r_sym);
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}
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have_got_offset = true;
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break;
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default:
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break;
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}
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switch (r_type)
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{
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@ -1135,10 +1199,8 @@ Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo,
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break;
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case elfcpp::R_X86_64_GOT32:
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// Local GOT offsets not yet supported.
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gold_assert(gsym);
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gold_assert(gsym->has_got_offset());
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Relocate_functions<64, false>::rela32(view, gsym->got_offset(), addend);
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gold_assert(have_got_offset);
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Relocate_functions<64, false>::rela32(view, got_offset, addend);
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break;
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case elfcpp::R_X86_64_GOTPC32:
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@ -1154,10 +1216,8 @@ Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo,
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// The ABI doc says "Like GOT64, but indicates a PLT entry is needed."
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// Since we always add a PLT entry, this is equivalent.
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case elfcpp::R_X86_64_GOTPLT64: // TODO(csilvers): correct?
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// Local GOT offsets not yet supported.
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gold_assert(gsym);
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gold_assert(gsym->has_got_offset());
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Relocate_functions<64, false>::rela64(view, gsym->got_offset(), addend);
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gold_assert(have_got_offset);
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Relocate_functions<64, false>::rela64(view, got_offset, addend);
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break;
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case elfcpp::R_X86_64_GOTPC64:
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@ -1180,25 +1240,19 @@ Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo,
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case elfcpp::R_X86_64_GOTPCREL:
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{
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// Local GOT offsets not yet supported.
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gold_assert(gsym);
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gold_assert(gsym->has_got_offset());
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elfcpp::Elf_types<64>::Elf_Addr value;
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value = (target->got_section(NULL, NULL)->address()
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+ gsym->got_offset());
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Relocate_functions<64, false>::pcrela32(view, value, addend, address);
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gold_assert(have_got_offset);
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elfcpp::Elf_types<64>::Elf_Addr value;
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value = target->got_section(NULL, NULL)->address() + got_offset;
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Relocate_functions<64, false>::pcrela32(view, value, addend, address);
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}
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break;
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case elfcpp::R_X86_64_GOTPCREL64:
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{
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// Local GOT offsets not yet supported.
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gold_assert(gsym);
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gold_assert(gsym->has_got_offset());
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elfcpp::Elf_types<64>::Elf_Addr value;
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value = (target->got_section(NULL, NULL)->address()
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+ gsym->got_offset());
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Relocate_functions<64, false>::pcrela64(view, value, addend, address);
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gold_assert(have_got_offset);
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elfcpp::Elf_types<64>::Elf_Addr value;
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value = target->got_section(NULL, NULL)->address() + got_offset;
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Relocate_functions<64, false>::pcrela64(view, value, addend, address);
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}
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break;
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@ -1209,12 +1263,10 @@ Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo,
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// These are outstanding tls relocs, which are unexpected when linking
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case elfcpp::R_X86_64_TPOFF64:
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case elfcpp::R_X86_64_DTPMOD64:
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case elfcpp::R_X86_64_DTPOFF64:
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case elfcpp::R_X86_64_DTPOFF32:
|
||||
case elfcpp::R_X86_64_TLSDESC:
|
||||
fprintf(stderr, _("%s: %s: unexpected reloc %u in object file\n"),
|
||||
program_name,
|
||||
relinfo->location(relnum, rel.get_r_offset()).c_str(),
|
||||
relinfo->location(relnum, rela.get_r_offset()).c_str(),
|
||||
r_type);
|
||||
gold_exit(false);
|
||||
break;
|
||||
|
|
@ -1226,7 +1278,9 @@ Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo,
|
|||
case elfcpp::R_X86_64_TPOFF32: // TODO(csilvers): correct?
|
||||
case elfcpp::R_X86_64_GOTPC32_TLSDESC: // TODO(csilvers): correct?
|
||||
case elfcpp::R_X86_64_TLSDESC_CALL: // TODO(csilvers): correct?
|
||||
this->relocate_tls(relinfo, relnum, rel, r_type, gsym, psymval, view,
|
||||
case elfcpp::R_X86_64_DTPOFF32:
|
||||
case elfcpp::R_X86_64_DTPOFF64:
|
||||
this->relocate_tls(relinfo, relnum, rela, r_type, gsym, psymval, view,
|
||||
address, view_size);
|
||||
break;
|
||||
|
||||
|
|
@ -1236,7 +1290,7 @@ Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo,
|
|||
default:
|
||||
fprintf(stderr, _("%s: %s: unsupported reloc %u\n"),
|
||||
program_name,
|
||||
relinfo->location(relnum, rel.get_r_offset()).c_str(),
|
||||
relinfo->location(relnum, rela.get_r_offset()).c_str(),
|
||||
r_type);
|
||||
gold_exit(false);
|
||||
break;
|
||||
|
|
@ -1318,6 +1372,22 @@ Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo,
|
|||
r_type);
|
||||
gold_exit(false);
|
||||
break;
|
||||
|
||||
case elfcpp::R_X86_64_DTPOFF32:
|
||||
if (opt_r_type == elfcpp::R_X86_64_TPOFF32)
|
||||
value = value - (tls_segment->vaddr() + tls_segment->memsz());
|
||||
else
|
||||
value = value - tls_segment->vaddr();
|
||||
Relocate_functions<64, false>::rel32(view, value);
|
||||
break;
|
||||
|
||||
case elfcpp::R_X86_64_DTPOFF64:
|
||||
if (opt_r_type == elfcpp::R_X86_64_TPOFF64)
|
||||
value = value - (tls_segment->vaddr() + tls_segment->memsz());
|
||||
else
|
||||
value = value - tls_segment->vaddr();
|
||||
Relocate_functions<64, false>::rel64(view, value);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -1335,50 +1405,47 @@ Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info<64, false>* relinfo,
|
|||
unsigned char* view,
|
||||
off_t view_size)
|
||||
{
|
||||
// We have to actually change the instructions, which means that we
|
||||
// need to examine the opcodes to figure out which instruction we
|
||||
// We need to examine the opcodes to figure out which instruction we
|
||||
// are looking at.
|
||||
|
||||
// movl %gs:XX,%eax ==> movl $YY,%eax
|
||||
// movl %gs:XX,%reg ==> movl $YY,%reg
|
||||
// addl %gs:XX,%reg ==> addl $YY,%reg
|
||||
Target_x86_64::Relocate::check_range(relinfo, relnum, rel, view_size, -1);
|
||||
// movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg
|
||||
// addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg
|
||||
|
||||
Target_x86_64::Relocate::check_range(relinfo, relnum, rel, view_size, -3);
|
||||
Target_x86_64::Relocate::check_range(relinfo, relnum, rel, view_size, 4);
|
||||
|
||||
unsigned char op1 = view[-1];
|
||||
if (op1 == 0xa1)
|
||||
unsigned char op1 = view[-3];
|
||||
unsigned char op2 = view[-2];
|
||||
unsigned char op3 = view[-1];
|
||||
unsigned char reg = op3 >> 3;
|
||||
|
||||
if (op2 == 0x8b)
|
||||
{
|
||||
// movl XX,%eax ==> movl $YY,%eax
|
||||
view[-1] = 0xb8;
|
||||
// movq
|
||||
if (op1 == 0x4c)
|
||||
view[-3] = 0x49;
|
||||
view[-2] = 0xc7;
|
||||
view[-1] = 0xc0 | reg;
|
||||
}
|
||||
else if (reg == 4)
|
||||
{
|
||||
// Special handling for %rsp.
|
||||
if (op1 == 0x4c)
|
||||
view[-3] = 0x49;
|
||||
view[-2] = 0x81;
|
||||
view[-1] = 0xc0 | reg;
|
||||
}
|
||||
else
|
||||
{
|
||||
Target_x86_64::Relocate::check_range(relinfo, relnum, rel,
|
||||
view_size, -2);
|
||||
|
||||
unsigned char op2 = view[-2];
|
||||
if (op2 == 0x8b)
|
||||
{
|
||||
// movl XX,%reg ==> movl $YY,%reg
|
||||
Target_x86_64::Relocate::check_tls(relinfo, relnum, rel,
|
||||
(op1 & 0xc7) == 0x05);
|
||||
view[-2] = 0xc7;
|
||||
view[-1] = 0xc0 | ((op1 >> 3) & 7);
|
||||
}
|
||||
else if (op2 == 0x03)
|
||||
{
|
||||
// addl XX,%reg ==> addl $YY,%reg
|
||||
Target_x86_64::Relocate::check_tls(relinfo, relnum, rel,
|
||||
(op1 & 0xc7) == 0x05);
|
||||
view[-2] = 0x81;
|
||||
view[-1] = 0xc0 | ((op1 >> 3) & 7);
|
||||
}
|
||||
else
|
||||
Target_x86_64::Relocate::check_tls(relinfo, relnum, rel, 0);
|
||||
// addq
|
||||
if (op1 == 0x4c)
|
||||
view[-3] = 0x4d;
|
||||
view[-2] = 0x8d;
|
||||
view[-1] = 0x80 | reg | (reg << 3);
|
||||
}
|
||||
|
||||
value = value - (tls_segment->vaddr() + tls_segment->memsz());
|
||||
Relocate_functions<64, false>::rel32(view, value);
|
||||
Relocate_functions<64, false>::rela32(view, value, 0);
|
||||
}
|
||||
|
||||
// Do a relocation in which we convert a TLS Global-Dynamic to a
|
||||
|
|
@ -1395,54 +1462,24 @@ Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info<64, false>* relinfo,
|
|||
unsigned char* view,
|
||||
off_t view_size)
|
||||
{
|
||||
// leal foo(,%reg,1),%eax; call ___tls_get_addr
|
||||
// ==> movl %gs,0,%eax; subl $foo@tpoff,%eax
|
||||
// leal foo(%reg),%eax; call ___tls_get_addr
|
||||
// ==> movl %gs:0,%eax; subl $foo@tpoff,%eax
|
||||
// .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
|
||||
// .word 0x6666; rex64; call __tls_get_addr
|
||||
// ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax
|
||||
|
||||
Target_x86_64::Relocate::check_range(relinfo, relnum, rel, view_size, -2);
|
||||
Target_x86_64::Relocate::check_range(relinfo, relnum, rel, view_size, 9);
|
||||
|
||||
unsigned char op1 = view[-1];
|
||||
unsigned char op2 = view[-2];
|
||||
Target_x86_64::Relocate::check_range(relinfo, relnum, rel, view_size, -4);
|
||||
Target_x86_64::Relocate::check_range(relinfo, relnum, rel, view_size, 12);
|
||||
|
||||
Target_x86_64::Relocate::check_tls(relinfo, relnum, rel,
|
||||
op2 == 0x8d || op2 == 0x04);
|
||||
(memcmp(view - 4, "\x66\x48\x8d\x3d", 4)
|
||||
== 0));
|
||||
Target_x86_64::Relocate::check_tls(relinfo, relnum, rel,
|
||||
view[4] == 0xe8);
|
||||
(memcmp(view + 4, "\x66\x66\x48\xe8", 4)
|
||||
== 0));
|
||||
|
||||
int roff = 5;
|
||||
memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", 16);
|
||||
|
||||
if (op2 == 0x04)
|
||||
{
|
||||
Target_x86_64::Relocate::check_range(relinfo, relnum, rel, view_size, -3);
|
||||
Target_x86_64::Relocate::check_tls(relinfo, relnum, rel,
|
||||
view[-3] == 0x8d);
|
||||
Target_x86_64::Relocate::check_tls(relinfo, relnum, rel,
|
||||
((op1 & 0xc7) == 0x05
|
||||
&& op1 != (4 << 3)));
|
||||
memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
|
||||
}
|
||||
else
|
||||
{
|
||||
Target_x86_64::Relocate::check_tls(relinfo, relnum, rel,
|
||||
(op1 & 0xf8) == 0x80 && (op1 & 7) != 4);
|
||||
if (static_cast<off_t>(rel.get_r_offset() + 9) < view_size
|
||||
&& view[9] == 0x90)
|
||||
{
|
||||
// There is a trailing nop. Use the size byte subl.
|
||||
memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
|
||||
roff = 6;
|
||||
}
|
||||
else
|
||||
{
|
||||
// Use the five byte subl.
|
||||
memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
|
||||
}
|
||||
}
|
||||
|
||||
value = tls_segment->vaddr() + tls_segment->memsz() - value;
|
||||
Relocate_functions<64, false>::rel32(view + roff, value);
|
||||
value = value - (tls_segment->vaddr() + tls_segment->memsz());
|
||||
Relocate_functions<64, false>::rela32(view + 8, value, 0);
|
||||
|
||||
// The next reloc should be a PLT32 reloc against __tls_get_addr.
|
||||
// We can skip it.
|
||||
|
|
|
|||
Loading…
Reference in New Issue