-// target.cc
+// target.cc -- target support for gold.
-// Copyright 2009 Free Software Foundation, Inc.
+// Copyright (C) 2009-2020 Free Software Foundation, Inc.
// Written by Doug Kwan <dougkwan@google.com>.
// This file is part of gold.
// 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 overriden by children classes to
+// --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
+Target::do_is_local_label_name(const char* name) const
{
// Normal local symbols start with ``.L''.
if (name[0] == '.' && name[1] == 'L')
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, const unsigned char*,
+ const unsigned char*, section_size_type) 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, const unsigned char*, size_t,
+ 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);
+ }
+}
+
+// Return address and size to plug into eh_frame FDEs associated with a PLT.
+void
+Target::do_plt_fde_location(const Output_data* plt, unsigned char*,
+ uint64_t* address, off_t* len) const
+{
+ *address = plt->address();
+ *len = plt->data_size();
+}
+
+// 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)
+{
+ elfcpp::ELFOSABI osabi = this->osabi();
+ if (osabi != elfcpp::ELFOSABI_NONE)
+ {
+ gold_assert(len == elfcpp::Elf_sizes<size>::ehdr_size);
+
+ elfcpp::Ehdr<size, big_endian> 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, big_endian> 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.
projects / deliverable / binutils-gdb.git / blobdiff