diff options
Diffstat (limited to 'gold/arm.cc')
| -rw-r--r-- | gold/arm.cc | 136 |
1 files changed, 94 insertions, 42 deletions
diff --git a/gold/arm.cc b/gold/arm.cc index 0f9f1bd..c2ac5a0 100644 --- a/gold/arm.cc +++ b/gold/arm.cc @@ -602,7 +602,7 @@ class Reloc_stub : public Stub // Otherwise, this points a relobj. We used the unsized and target // independent Symbol and Relobj classes instead of Sized_symbol<32> and // Arm_relobj. This is done to avoid making the stub class a template - // as most of the stub machinery is endianity-neutral. However, it + // as most of the stub machinery is endianness-neutral. However, it // may require a bit of casting done by users of this class. union { @@ -1065,7 +1065,7 @@ class Arm_exidx_cantunwind : public Output_section_data } private: - // Implement do_write for a given endianity. + // Implement do_write for a given endianness. template<bool big_endian> void inline do_fixed_endian_write(Output_file*); @@ -1426,7 +1426,8 @@ class Arm_relobj : public Sized_relobj<32, big_endian> stub_tables_(), local_symbol_is_thumb_function_(), attributes_section_data_(NULL), mapping_symbols_info_(), section_has_cortex_a8_workaround_(NULL), exidx_section_map_(), - output_local_symbol_count_needs_update_(false) + output_local_symbol_count_needs_update_(false), + merge_flags_and_attributes_(true) { } ~Arm_relobj() @@ -1565,6 +1566,11 @@ class Arm_relobj : public Sized_relobj<32, big_endian> void update_output_local_symbol_count(); + // Whether we want to merge processor-specific flags and attributes. + bool + merge_flags_and_attributes() const + { return this->merge_flags_and_attributes_; } + protected: // Post constructor setup. void @@ -1665,6 +1671,9 @@ class Arm_relobj : public Sized_relobj<32, big_endian> Exidx_section_map exidx_section_map_; // Whether output local symbol count needs updating. bool output_local_symbol_count_needs_update_; + // Whether we merge processor flags and attributes of this object to + // output. + bool merge_flags_and_attributes_; }; // Arm_dynobj class. @@ -4124,7 +4133,7 @@ Stub_template::Stub_template( // Stub methods. -// Template to implement do_write for a specific target endianity. +// Template to implement do_write for a specific target endianness. template<bool big_endian> void inline @@ -4969,7 +4978,7 @@ Arm_input_section<big_endian>::do_reset_address_and_file_offset() // Arm_exidx_cantunwind methods. -// Write this to Output file OF for a fixed endianity. +// Write this to Output file OF for a fixed endianness. template<bool big_endian> void @@ -4990,7 +4999,7 @@ Arm_exidx_cantunwind::do_fixed_endian_write(Output_file* of) Arm_address output_offset = arm_relobj->get_output_section_offset(this->shndx_); Arm_address section_start; - if(output_offset != Arm_relobj<big_endian>::invalid_address) + if (output_offset != Arm_relobj<big_endian>::invalid_address) section_start = os->address() + output_offset; else { @@ -5946,7 +5955,7 @@ Arm_relobj<big_endian>::scan_sections_for_stubs( unsigned int index = this->adjust_shndx(shdr.get_sh_info()); Arm_address output_offset = this->get_output_section_offset(index); Arm_address output_address; - if(output_offset != invalid_address) + if (output_offset != invalid_address) output_address = out_sections[index]->address() + output_offset; else { @@ -6327,6 +6336,16 @@ Arm_relobj<big_endian>::do_read_symbols(Read_symbols_data* sd) // Call parent class to read symbol information. Sized_relobj<32, big_endian>::do_read_symbols(sd); + // If this input file is a binary file, it has no processor + // specific flags and attributes section. + Input_file::Format format = this->input_file()->format(); + if (format != Input_file::FORMAT_ELF) + { + gold_assert(format == Input_file::FORMAT_BINARY); + this->merge_flags_and_attributes_ = false; + return; + } + // Read processor-specific flags in ELF file header. const unsigned char* pehdr = this->get_view(elfcpp::file_header_offset, elfcpp::Elf_sizes<32>::ehdr_size, @@ -6340,9 +6359,27 @@ Arm_relobj<big_endian>::do_read_symbols(Read_symbols_data* sd) const size_t shdr_size = elfcpp::Elf_sizes<32>::shdr_size; const unsigned char* pshdrs = sd->section_headers->data(); const unsigned char *ps = pshdrs + shdr_size; + bool must_merge_flags_and_attributes = false; for (unsigned int i = 1; i < this->shnum(); ++i, ps += shdr_size) { elfcpp::Shdr<32, big_endian> shdr(ps); + + // Sometimes an object has no contents except the section name string + // table and an empty symbol table with the undefined symbol. We + // don't want to merge processor-specific flags from such an object. + if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB) + { + // Symbol table is not empty. + const elfcpp::Elf_types<32>::Elf_WXword sym_size = + elfcpp::Elf_sizes<32>::sym_size; + if (shdr.get_sh_size() > sym_size) + must_merge_flags_and_attributes = true; + } + else if (shdr.get_sh_type() != elfcpp::SHT_STRTAB) + // If this is neither an empty symbol table nor a string table, + // be conservative. + must_merge_flags_and_attributes = true; + if (shdr.get_sh_type() == elfcpp::SHT_ARM_ATTRIBUTES) { gold_assert(this->attributes_section_data_ == NULL); @@ -6367,6 +6404,13 @@ Arm_relobj<big_endian>::do_read_symbols(Read_symbols_data* sd) } } + // This is rare. + if (!must_merge_flags_and_attributes) + { + this->merge_flags_and_attributes_ = false; + return; + } + // Some tools are broken and they do not set the link of EXIDX sections. // We look at the first relocation to figure out the linked sections. if (!deferred_exidx_sections.empty()) @@ -7941,23 +7985,16 @@ Target_arm<big_endian>::do_finalize_sections( p != input_objects->relobj_end(); ++p) { - // If this input file is a binary file, it has no processor - // specific flags and attributes section. - Input_file::Format format = (*p)->input_file()->format(); - if (format != Input_file::FORMAT_ELF) - { - gold_assert(format == Input_file::FORMAT_BINARY); - continue; - } - Arm_relobj<big_endian>* arm_relobj = Arm_relobj<big_endian>::as_arm_relobj(*p); - this->merge_processor_specific_flags( - arm_relobj->name(), - arm_relobj->processor_specific_flags()); - this->merge_object_attributes(arm_relobj->name().c_str(), - arm_relobj->attributes_section_data()); - + if (arm_relobj->merge_flags_and_attributes()) + { + this->merge_processor_specific_flags( + arm_relobj->name(), + arm_relobj->processor_specific_flags()); + this->merge_object_attributes(arm_relobj->name().c_str(), + arm_relobj->attributes_section_data()); + } } for (Input_objects::Dynobj_iterator p = input_objects->dynobj_begin(); @@ -8046,13 +8083,17 @@ Target_arm<big_endian>::do_finalize_sections( } } - // Create an .ARM.attributes section if there is not one already. - Output_attributes_section_data* attributes_section = - new Output_attributes_section_data(*this->attributes_section_data_); - layout->add_output_section_data(".ARM.attributes", - elfcpp::SHT_ARM_ATTRIBUTES, 0, - attributes_section, false, false, false, - false); + // Create an .ARM.attributes section unless we have no regular input + // object. In that case the output will be empty. + if (input_objects->number_of_relobjs() != 0) + { + Output_attributes_section_data* attributes_section = + new Output_attributes_section_data(*this->attributes_section_data_); + layout->add_output_section_data(".ARM.attributes", + elfcpp::SHT_ARM_ATTRIBUTES, 0, + attributes_section, false, false, false, + false); + } } // Return whether a direct absolute static relocation needs to be applied. @@ -8970,7 +9011,8 @@ Target_arm<big_endian>::merge_processor_specific_flags( // Complain about various flag mismatches. elfcpp::Elf_Word version1 = elfcpp::arm_eabi_version(flags); elfcpp::Elf_Word version2 = elfcpp::arm_eabi_version(out_flags); - if (!this->are_eabi_versions_compatible(version1, version2)) + if (!this->are_eabi_versions_compatible(version1, version2) + && parameters->options().warn_mismatch()) gold_error(_("Source object %s has EABI version %d but output has " "EABI version %d."), name.c_str(), @@ -9381,7 +9423,8 @@ Target_arm<big_endian>::merge_object_attributes( if (out_attr[elfcpp::Tag_ABI_FP_number_model].int_value() == 0) out_attr[elfcpp::Tag_ABI_VFP_args].set_int_value( in_attr[elfcpp::Tag_ABI_VFP_args].int_value()); - else if (in_attr[elfcpp::Tag_ABI_FP_number_model].int_value() != 0) + else if (in_attr[elfcpp::Tag_ABI_FP_number_model].int_value() != 0 + && parameters->options().warn_mismatch()) gold_error(_("%s uses VFP register arguments, output does not"), name); } @@ -9525,7 +9568,7 @@ Target_arm<big_endian>::merge_object_attributes( && (out_attr[i].int_value() == 'A' || out_attr[i].int_value() == 'R'))) ; // Do nothing. - else + else if (parameters->options().warn_mismatch()) { gold_error (_("conflicting architecture profiles %c/%c"), @@ -9580,7 +9623,9 @@ Target_arm<big_endian>::merge_object_attributes( case elfcpp::Tag_PCS_config: if (out_attr[i].int_value() == 0) out_attr[i].set_int_value(in_attr[i].int_value()); - else if (in_attr[i].int_value() != 0 && out_attr[i].int_value() != 0) + else if (in_attr[i].int_value() != 0 + && out_attr[i].int_value() != 0 + && parameters->options().warn_mismatch()) { // It's sometimes ok to mix different configs, so this is only // a warning. @@ -9590,7 +9635,8 @@ Target_arm<big_endian>::merge_object_attributes( case elfcpp::Tag_ABI_PCS_R9_use: if (in_attr[i].int_value() != out_attr[i].int_value() && out_attr[i].int_value() != elfcpp::AEABI_R9_unused - && in_attr[i].int_value() != elfcpp::AEABI_R9_unused) + && in_attr[i].int_value() != elfcpp::AEABI_R9_unused + && parameters->options().warn_mismatch()) { gold_error(_("%s: conflicting use of R9"), name); } @@ -9602,11 +9648,12 @@ Target_arm<big_endian>::merge_object_attributes( && (in_attr[elfcpp::Tag_ABI_PCS_R9_use].int_value() != elfcpp::AEABI_R9_SB) && (out_attr[elfcpp::Tag_ABI_PCS_R9_use].int_value() - != elfcpp::AEABI_R9_unused)) + != elfcpp::AEABI_R9_unused) + && parameters->options().warn_mismatch()) { gold_error(_("%s: SB relative addressing conflicts with use " "of R9"), - name); + name); } // Use the smallest value specified. if (in_attr[i].int_value() < out_attr[i].int_value()) @@ -9616,7 +9663,8 @@ Target_arm<big_endian>::merge_object_attributes( // FIXME: Make it possible to turn off this warning. if (out_attr[i].int_value() && in_attr[i].int_value() - && out_attr[i].int_value() != in_attr[i].int_value()) + && out_attr[i].int_value() != in_attr[i].int_value() + && parameters->options().warn_mismatch()) { gold_warning(_("%s uses %u-byte wchar_t yet the output is to " "use %u-byte wchar_t; use of wchar_t values " @@ -9639,7 +9687,8 @@ Target_arm<big_endian>::merge_object_attributes( } // FIXME: Make it possible to turn off this warning. else if (in_attr[i].int_value() != elfcpp::AEABI_enum_forced_wide - && out_attr[i].int_value() != in_attr[i].int_value()) + && out_attr[i].int_value() != in_attr[i].int_value() + && parameters->options().warn_mismatch()) { unsigned int in_value = in_attr[i].int_value(); unsigned int out_value = out_attr[i].int_value(); @@ -9656,7 +9705,8 @@ Target_arm<big_endian>::merge_object_attributes( // Aready done. break; case elfcpp::Tag_ABI_WMMX_args: - if (in_attr[i].int_value() != out_attr[i].int_value()) + if (in_attr[i].int_value() != out_attr[i].int_value() + && parameters->options().warn_mismatch()) { gold_error(_("%s uses iWMMXt register arguments, output does " "not"), @@ -9677,7 +9727,8 @@ Target_arm<big_endian>::merge_object_attributes( case elfcpp::Tag_ABI_FP_16bit_format: if (in_attr[i].int_value() != 0 && out_attr[i].int_value() != 0) { - if (in_attr[i].int_value() != out_attr[i].int_value()) + if (in_attr[i].int_value() != out_attr[i].int_value() + && parameters->options().warn_mismatch()) gold_error(_("fp16 format mismatch between %s and output"), name); } @@ -9714,7 +9765,8 @@ Target_arm<big_endian>::merge_object_attributes( || in_attr[i].string_value() != "") err_object = name; - if (err_object != NULL) + if (err_object != NULL + && parameters->options().warn_mismatch()) { // Attribute numbers >=64 (mod 128) can be safely ignored. if ((i & 127) < 64) @@ -9806,7 +9858,7 @@ Target_arm<big_endian>::merge_object_attributes( } } - if (err_object) + if (err_object && parameters->options().warn_mismatch()) { // Attribute numbers >=64 (mod 128) can be safely ignored. */ if ((err_tag & 127) < 64) |