diff options
Diffstat (limited to 'gold/arm.cc')
| -rw-r--r-- | gold/arm.cc | 270 |
1 files changed, 268 insertions, 2 deletions
diff --git a/gold/arm.cc b/gold/arm.cc index a25fc213ef..210ccf7391 100644 --- a/gold/arm.cc +++ b/gold/arm.cc @@ -947,6 +947,12 @@ class Arm_relobj : public Sized_relobj<32, big_endian> as_arm_relobj(Relobj* relobj) { return static_cast<Arm_relobj<big_endian>*>(relobj); } + // Processor-specific flags in ELF file header. This is valid only after + // reading symbols. + elfcpp::Elf_Word + processor_specific_flags() const + { return this->processor_specific_flags_; } + protected: // Post constructor setup. void @@ -971,6 +977,10 @@ class Arm_relobj : public Sized_relobj<32, big_endian> const unsigned char* pshdrs, typename Sized_relobj<32, big_endian>::Views* pivews); + // Read the symbol information. + void + do_read_symbols(Read_symbols_data* sd); + private: // List of stub tables. typedef std::vector<Stub_table<big_endian>*> Stub_table_list; @@ -978,6 +988,45 @@ class Arm_relobj : public Sized_relobj<32, big_endian> // Bit vector to tell if a local symbol is a thumb function or not. // This is only valid after do_count_local_symbol is called. std::vector<bool> local_symbol_is_thumb_function_; + // processor-specific flags in ELF file header. + elfcpp::Elf_Word processor_specific_flags_; +}; + +// Arm_dynobj class. + +template<bool big_endian> +class Arm_dynobj : public Sized_dynobj<32, big_endian> +{ + public: + Arm_dynobj(const std::string& name, Input_file* input_file, off_t offset, + const elfcpp::Ehdr<32, big_endian>& ehdr) + : Sized_dynobj<32, big_endian>(name, input_file, offset, ehdr), + processor_specific_flags_(0) + { } + + ~Arm_dynobj() + { } + + // Downcast a base pointer to an Arm_relobj pointer. This is + // not type-safe but we only use Arm_relobj not the base class. + static Arm_dynobj<big_endian>* + as_arm_dynobj(Dynobj* dynobj) + { return static_cast<Arm_dynobj<big_endian>*>(dynobj); } + + // Processor-specific flags in ELF file header. This is valid only after + // reading symbols. + elfcpp::Elf_Word + processor_specific_flags() const + { return this->processor_specific_flags_; } + + protected: + // Read the symbol information. + void + do_read_symbols(Read_symbols_data* sd); + + private: + // processor-specific flags in ELF file header. + elfcpp::Elf_Word processor_specific_flags_; }; // Utilities for manipulating integers of up to 32-bits @@ -1120,7 +1169,7 @@ class Target_arm : public Sized_target<32, big_endian> // Finalize the sections. void - do_finalize_sections(Layout*); + do_finalize_sections(Layout*, const Input_objects*); // Return the value to use for a dynamic symbol which requires special // treatment. @@ -1196,6 +1245,10 @@ class Target_arm : public Sized_target<32, big_endian> return static_cast<const Target_arm<big_endian>&>(parameters->target()); } + protected: + void + do_adjust_elf_header(unsigned char* view, int len) const; + private: // The class which scans relocations. class Scan @@ -1366,6 +1419,34 @@ class Target_arm : public Sized_target<32, big_endian> this->rel_dyn_section(layout)); } + // Whether two EABI versions are compatible. + static bool + are_eabi_versions_compatible(elfcpp::Elf_Word v1, elfcpp::Elf_Word v2); + + // Merge processor-specific flags from input object and those in the ELF + // header of the output. + void + merge_processor_specific_flags(const std::string&, elfcpp::Elf_Word); + + Object* + do_make_elf_object(const std::string&, Input_file*, off_t, + const elfcpp::Ehdr<32, big_endian>& ehdr); + + Object* + do_make_elf_object(const std::string&, Input_file*, off_t, + const elfcpp::Ehdr<32, !big_endian>&) + { gold_unreachable(); } + + Object* + do_make_elf_object(const std::string&, Input_file*, off_t, + const elfcpp::Ehdr<64, false>&) + { gold_unreachable(); } + + Object* + do_make_elf_object(const std::string&, Input_file*, off_t, + const elfcpp::Ehdr<64, true>&) + { gold_unreachable(); } + // Information about this specific target which we pass to the // general Target structure. static const Target::Target_info arm_info; @@ -3250,6 +3331,42 @@ Arm_relobj<big_endian>::do_relocate_sections( } } +// Read the symbol information. + +template<bool big_endian> +void +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); + + // 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, + true, false); + elfcpp::Ehdr<32, big_endian> ehdr(pehdr); + this->processor_specific_flags_ = ehdr.get_e_flags(); +} + +// Arm_dynobj methods. + +// Read the symbol information. + +template<bool big_endian> +void +Arm_dynobj<big_endian>::do_read_symbols(Read_symbols_data* sd) +{ + // Call parent class to read symbol information. + Sized_dynobj<32, big_endian>::do_read_symbols(sd); + + // 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, + true, false); + elfcpp::Ehdr<32, big_endian> ehdr(pehdr); + this->processor_specific_flags_ = ehdr.get_e_flags(); +} + // A class to handle the PLT data. template<bool big_endian> @@ -3950,8 +4067,33 @@ Target_arm<big_endian>::scan_relocs(Symbol_table* symtab, template<bool big_endian> void -Target_arm<big_endian>::do_finalize_sections(Layout* layout) +Target_arm<big_endian>::do_finalize_sections( + Layout* layout, + const Input_objects* input_objects) { + // Merge processor-specific flags. + for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); + p != input_objects->relobj_end(); + ++p) + { + 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()); + } + + for (Input_objects::Dynobj_iterator p = input_objects->dynobj_begin(); + p != input_objects->dynobj_end(); + ++p) + { + Arm_dynobj<big_endian>* arm_dynobj = + Arm_dynobj<big_endian>::as_arm_dynobj(*p); + this->merge_processor_specific_flags( + arm_dynobj->name(), + arm_dynobj->processor_specific_flags()); + } + // Fill in some more dynamic tags. Output_data_dynamic* const odyn = layout->dynamic_data(); if (odyn != NULL) @@ -4588,6 +4730,130 @@ Target_arm<big_endian>::get_real_reloc_type (unsigned int r_type) } } +// Whether if two EABI versions V1 and V2 are compatible. + +template<bool big_endian> +bool +Target_arm<big_endian>::are_eabi_versions_compatible( + elfcpp::Elf_Word v1, + elfcpp::Elf_Word v2) +{ + // v4 and v5 are the same spec before and after it was released, + // so allow mixing them. + if ((v1 == elfcpp::EF_ARM_EABI_VER4 && v2 == elfcpp::EF_ARM_EABI_VER5) + || (v1 == elfcpp::EF_ARM_EABI_VER5 && v2 == elfcpp::EF_ARM_EABI_VER4)) + return true; + + return v1 == v2; +} + +// Combine FLAGS from an input object called NAME and the processor-specific +// flags in the ELF header of the output. Much of this is adapted from the +// processor-specific flags merging code in elf32_arm_merge_private_bfd_data +// in bfd/elf32-arm.c. + +template<bool big_endian> +void +Target_arm<big_endian>::merge_processor_specific_flags( + const std::string& name, + elfcpp::Elf_Word flags) +{ + if (this->are_processor_specific_flags_set()) + { + elfcpp::Elf_Word out_flags = this->processor_specific_flags(); + + // Nothing to merge if flags equal to those in output. + if (flags == out_flags) + return; + + // 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)) + gold_error(_("Source object %s has EABI version %d but output has " + "EABI version %d."), + name.c_str(), + (flags & elfcpp::EF_ARM_EABIMASK) >> 24, + (out_flags & elfcpp::EF_ARM_EABIMASK) >> 24); + } + else + { + // If the input is the default architecture and had the default + // flags then do not bother setting the flags for the output + // architecture, instead allow future merges to do this. If no + // future merges ever set these flags then they will retain their + // uninitialised values, which surprise surprise, correspond + // to the default values. + if (flags == 0) + return; + + // This is the first time, just copy the flags. + // We only copy the EABI version for now. + this->set_processor_specific_flags(flags & elfcpp::EF_ARM_EABIMASK); + } +} + +// Adjust ELF file header. +template<bool big_endian> +void +Target_arm<big_endian>::do_adjust_elf_header( + unsigned char* view, + int len) const +{ + gold_assert(len == elfcpp::Elf_sizes<32>::ehdr_size); + + elfcpp::Ehdr<32, big_endian> ehdr(view); + unsigned char e_ident[elfcpp::EI_NIDENT]; + memcpy(e_ident, ehdr.get_e_ident(), elfcpp::EI_NIDENT); + + if (elfcpp::arm_eabi_version(this->processor_specific_flags()) + == elfcpp::EF_ARM_EABI_UNKNOWN) + e_ident[elfcpp::EI_OSABI] = elfcpp::ELFOSABI_ARM; + else + e_ident[elfcpp::EI_OSABI] = 0; + e_ident[elfcpp::EI_ABIVERSION] = 0; + + // FIXME: Do EF_ARM_BE8 adjustment. + + elfcpp::Ehdr_write<32, big_endian> oehdr(view); + oehdr.put_e_ident(e_ident); +} + +// do_make_elf_object to override the same function in the base class. +// We need to use a target-specific sub-class of Sized_relobj<32, big_endian> +// to store ARM specific information. Hence we need to have our own +// ELF object creation. + +template<bool big_endian> +Object* +Target_arm<big_endian>::do_make_elf_object( + const std::string& name, + Input_file* input_file, + off_t offset, const elfcpp::Ehdr<32, big_endian>& ehdr) +{ + int et = ehdr.get_e_type(); + if (et == elfcpp::ET_REL) + { + Arm_relobj<big_endian>* obj = + new Arm_relobj<big_endian>(name, input_file, offset, ehdr); + obj->setup(); + return obj; + } + else if (et == elfcpp::ET_DYN) + { + Sized_dynobj<32, big_endian>* obj = + new Arm_dynobj<big_endian>(name, input_file, offset, ehdr); + obj->setup(); + return obj; + } + else + { + gold_error(_("%s: unsupported ELF file type %d"), + name.c_str(), et); + return NULL; + } +} + // The selector for arm object files. template<bool big_endian> |