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[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [gold/] [target.cc] - Rev 272
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// target.cc -- target support for gold. // Copyright 2009, 2010, 2011 Free Software Foundation, Inc. // Written by Doug Kwan <dougkwan@google.com>. // This file is part of gold. // This program is free software; you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation; either version 3 of the License, or // (at your option) any later version. // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // You should have received a copy of the GNU General Public License // along with this program; if not, write to the Free Software // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, // MA 02110-1301, USA. #include "gold.h" #include "elfcpp.h" #include "dynobj.h" #include "symtab.h" #include "output.h" #include "target.h" namespace gold { // Return whether NAME is a local label name. This is used to implement the // --discard-locals options and can be overridden by child classes to // implement system-specific behaviour. The logic here is the same as that // in _bfd_elf_is_local_label_name(). bool Target::do_is_local_label_name(const char* name) const { // Normal local symbols start with ``.L''. if (name[0] == '.' && name[1] == 'L') return true; // At least some SVR4 compilers (e.g., UnixWare 2.1 cc) generate // DWARF debugging symbols starting with ``..''. if (name[0] == '.' && name[1] == '.') return true; // gcc will sometimes generate symbols beginning with ``_.L_'' when // emitting DWARF debugging output. I suspect this is actually a // small bug in gcc (it calls ASM_OUTPUT_LABEL when it should call // ASM_GENERATE_INTERNAL_LABEL, and this causes the leading // underscore to be emitted on some ELF targets). For ease of use, // we treat such symbols as local. if (name[0] == '_' && name[1] == '.' && name[2] == 'L' && name[3] == '_') return true; return false; } // Implementations of methods Target::do_make_elf_object are almost identical // except for the address sizes and endianities. So we extract this // into a template. template<int size, bool big_endian> inline Object* Target::do_make_elf_object_implementation( const std::string& name, Input_file* input_file, off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr) { int et = ehdr.get_e_type(); // ET_EXEC files are valid input for --just-symbols/-R, // and we treat them as relocatable objects. if (et == elfcpp::ET_REL || (et == elfcpp::ET_EXEC && input_file->just_symbols())) { Sized_relobj_file<size, big_endian>* obj = new Sized_relobj_file<size, big_endian>(name, input_file, offset, ehdr); obj->setup(); return obj; } else if (et == elfcpp::ET_DYN) { Sized_dynobj<size, big_endian>* obj = new Sized_dynobj<size, 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; } } // Make an ELF object called NAME by reading INPUT_FILE at OFFSET. EHDR // is the ELF header of the object. There are four versions of this // for different address sizes and endianities. #ifdef HAVE_TARGET_32_LITTLE Object* Target::do_make_elf_object(const std::string& name, Input_file* input_file, off_t offset, const elfcpp::Ehdr<32, false>& ehdr) { return this->do_make_elf_object_implementation<32, false>(name, input_file, offset, ehdr); } #endif #ifdef HAVE_TARGET_32_BIG Object* Target::do_make_elf_object(const std::string& name, Input_file* input_file, off_t offset, const elfcpp::Ehdr<32, true>& ehdr) { return this->do_make_elf_object_implementation<32, true>(name, input_file, offset, ehdr); } #endif #ifdef HAVE_TARGET_64_LITTLE Object* Target::do_make_elf_object(const std::string& name, Input_file* input_file, off_t offset, const elfcpp::Ehdr<64, false>& ehdr) { return this->do_make_elf_object_implementation<64, false>(name, input_file, offset, ehdr); } #endif #ifdef HAVE_TARGET_64_BIG Object* Target::do_make_elf_object(const std::string& name, Input_file* input_file, off_t offset, const elfcpp::Ehdr<64, true>& ehdr) { return this->do_make_elf_object_implementation<64, true>(name, input_file, offset, ehdr); } #endif Output_section* Target::do_make_output_section(const char* name, elfcpp::Elf_Word type, elfcpp::Elf_Xword flags) { return new Output_section(name, type, flags); } // Default for whether a reloc is a call to a non-split function is // whether the symbol is a function. bool Target::do_is_call_to_non_split(const Symbol* sym, unsigned int) const { return sym->type() == elfcpp::STT_FUNC; } // Default conversion for -fsplit-stack is to give an error. void Target::do_calls_non_split(Relobj* object, unsigned int, section_offset_type, section_size_type, unsigned char*, section_size_type, std::string*, std::string*) const { static bool warned; if (!warned) { gold_error(_("linker does not include stack split support " "required by %s"), object->name().c_str()); warned = true; } } // Return whether BYTES/LEN matches VIEW/VIEW_SIZE at OFFSET. bool Target::match_view(const unsigned char* view, section_size_type view_size, section_offset_type offset, const char* bytes, size_t len) const { if (offset + len > view_size) return false; return memcmp(view + offset, bytes, len) == 0; } // Set the contents of a VIEW/VIEW_SIZE to nops starting at OFFSET // for LEN bytes. void Target::set_view_to_nop(unsigned char* view, section_size_type view_size, section_offset_type offset, size_t len) const { gold_assert(offset >= 0 && offset + len <= view_size); if (!this->has_code_fill()) memset(view + offset, 0, len); else { std::string fill = this->code_fill(len); memcpy(view + offset, fill.data(), len); } } // Class Sized_target. // Set the EI_OSABI field of the ELF header if requested. template<int size, bool big_endian> void Sized_target<size, big_endian>::do_adjust_elf_header(unsigned char* view, int len) const { elfcpp::ELFOSABI osabi = this->osabi(); if (osabi != elfcpp::ELFOSABI_NONE) { gold_assert(len == elfcpp::Elf_sizes<size>::ehdr_size); elfcpp::Ehdr<size, false> ehdr(view); unsigned char e_ident[elfcpp::EI_NIDENT]; memcpy(e_ident, ehdr.get_e_ident(), elfcpp::EI_NIDENT); e_ident[elfcpp::EI_OSABI] = osabi; elfcpp::Ehdr_write<size, false> oehdr(view); oehdr.put_e_ident(e_ident); } } #ifdef HAVE_TARGET_32_LITTLE template class Sized_target<32, false>; #endif #ifdef HAVE_TARGET_32_BIG template class Sized_target<32, true>; #endif #ifdef HAVE_TARGET_64_LITTLE template class Sized_target<64, false>; #endif #ifdef HAVE_TARGET_64_BIG template class Sized_target<64, true>; #endif } // End namespace gold.
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