--- /dev/null
+// target.cc
+
+// Copyright 2009 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 "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<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();
+ if (et == elfcpp::ET_REL)
+ {
+ Sized_relobj<size, big_endian>* obj =
+ new Sized_relobj<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 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.
projects / msp430-binutils.git / blobdiff