X-Git-Url: https://oss.titaniummirror.com/gitweb?p=msp430-binutils.git;a=blobdiff_plain;f=gold%2Ftarget.cc;fp=gold%2Ftarget.cc;h=0ddc13d68ed91b0a67afa6d8f60d187e705cd733;hp=0000000000000000000000000000000000000000;hb=d5da4f291af551c0b8b79e1d4a9b173d60e5c10e;hpb=7b5ea4fcdf2819e070665ab5610f8b48e3867c10 diff --git a/gold/target.cc b/gold/target.cc new file mode 100644 index 0000000..0ddc13d --- /dev/null +++ b/gold/target.cc @@ -0,0 +1,193 @@ +// target.cc + +// Copyright 2009 Free Software Foundation, Inc. +// Written by Doug Kwan . + +// 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 "target.h" +#include "dynobj.h" +#include "output.h" +#include "elfcpp.h" + +namespace gold +{ + +// Return whether NAME is a local label name. This is used to implement the +// --discard-locals options and can be overriden by children 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 +inline Object* +Target::do_make_elf_object_implementation( + const std::string& name, + Input_file* input_file, + off_t offset, + const elfcpp::Ehdr& ehdr) +{ + int et = ehdr.get_e_type(); + if (et == elfcpp::ET_REL) + { + Sized_relobj* obj = + new Sized_relobj(name, input_file, offset, ehdr); + obj->setup(); + return obj; + } + else if (et == elfcpp::ET_DYN) + { + Sized_dynobj* obj = + new Sized_dynobj(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 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); + } +} + +} // End namespace gold.