+// Read a value with given size and endianness.
+
+static inline uint64_t
+read_sized_value(size_t size, const unsigned char* buf, bool is_big_endian,
+ const Object* object)
+{
+ uint64_t val = 0;
+ if (size == 4)
+ {
+ if (is_big_endian)
+ val = elfcpp::Swap<32, true>::readval(buf);
+ else
+ val = elfcpp::Swap<32, false>::readval(buf);
+ }
+ else if (size == 8)
+ {
+ if (is_big_endian)
+ val = elfcpp::Swap<64, true>::readval(buf);
+ else
+ val = elfcpp::Swap<64, false>::readval(buf);
+ }
+ else
+ {
+ gold_warning(_("%s: in .note.gnu.property section, "
+ "pr_datasz must be 4 or 8"),
+ object->name().c_str());
+ }
+ return val;
+}
+
+// Write a value with given size and endianness.
+
+static inline void
+write_sized_value(uint64_t value, size_t size, unsigned char* buf,
+ bool is_big_endian)
+{
+ if (size == 4)
+ {
+ if (is_big_endian)
+ elfcpp::Swap<32, true>::writeval(buf, static_cast<uint32_t>(value));
+ else
+ elfcpp::Swap<32, false>::writeval(buf, static_cast<uint32_t>(value));
+ }
+ else if (size == 8)
+ {
+ if (is_big_endian)
+ elfcpp::Swap<64, true>::writeval(buf, value);
+ else
+ elfcpp::Swap<64, false>::writeval(buf, value);
+ }
+ else
+ {
+ // We will have already complained about this.
+ }
+}
+
+// Handle the .note.gnu.property section at layout time.
+
+void
+Layout::layout_gnu_property(unsigned int note_type,
+ unsigned int pr_type,
+ size_t pr_datasz,
+ const unsigned char* pr_data,
+ const Object* object)
+{
+ // We currently support only the one note type.
+ gold_assert(note_type == elfcpp::NT_GNU_PROPERTY_TYPE_0);
+
+ if (pr_type >= elfcpp::GNU_PROPERTY_LOPROC
+ && pr_type < elfcpp::GNU_PROPERTY_HIPROC)
+ {
+ // Target-dependent property value; call the target to record.
+ const int size = parameters->target().get_size();
+ const bool is_big_endian = parameters->target().is_big_endian();
+ if (size == 32)
+ {
+ if (is_big_endian)
+ {
+#ifdef HAVE_TARGET_32_BIG
+ parameters->sized_target<32, true>()->
+ record_gnu_property(note_type, pr_type, pr_datasz, pr_data,
+ object);
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ {
+#ifdef HAVE_TARGET_32_LITTLE
+ parameters->sized_target<32, false>()->
+ record_gnu_property(note_type, pr_type, pr_datasz, pr_data,
+ object);
+#else
+ gold_unreachable();
+#endif
+ }
+ }
+ else if (size == 64)
+ {
+ if (is_big_endian)
+ {
+#ifdef HAVE_TARGET_64_BIG
+ parameters->sized_target<64, true>()->
+ record_gnu_property(note_type, pr_type, pr_datasz, pr_data,
+ object);
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ {
+#ifdef HAVE_TARGET_64_LITTLE
+ parameters->sized_target<64, false>()->
+ record_gnu_property(note_type, pr_type, pr_datasz, pr_data,
+ object);
+#else
+ gold_unreachable();
+#endif
+ }
+ }
+ else
+ gold_unreachable();
+ return;
+ }
+
+ Gnu_properties::iterator pprop = this->gnu_properties_.find(pr_type);
+ if (pprop == this->gnu_properties_.end())
+ {
+ Gnu_property prop;
+ prop.pr_datasz = pr_datasz;
+ prop.pr_data = new unsigned char[pr_datasz];
+ memcpy(prop.pr_data, pr_data, pr_datasz);
+ this->gnu_properties_[pr_type] = prop;
+ }
+ else
+ {
+ const bool is_big_endian = parameters->target().is_big_endian();
+ switch (pr_type)
+ {
+ case elfcpp::GNU_PROPERTY_STACK_SIZE:
+ // Record the maximum value seen.
+ {
+ uint64_t val1 = read_sized_value(pprop->second.pr_datasz,
+ pprop->second.pr_data,
+ is_big_endian, object);
+ uint64_t val2 = read_sized_value(pr_datasz, pr_data,
+ is_big_endian, object);
+ if (val2 > val1)
+ write_sized_value(val2, pprop->second.pr_datasz,
+ pprop->second.pr_data, is_big_endian);
+ }
+ break;
+ case elfcpp::GNU_PROPERTY_NO_COPY_ON_PROTECTED:
+ // No data to merge.
+ break;
+ default:
+ gold_warning(_("%s: unknown program property type %d "
+ "in .note.gnu.property section"),
+ object->name().c_str(), pr_type);
+ }
+ }
+}
+
+// Merge per-object properties with program properties.
+// This lets the target identify objects that are missing certain
+// properties, in cases where properties must be ANDed together.
+
+void
+Layout::merge_gnu_properties(const Object* object)
+{
+ const int size = parameters->target().get_size();
+ const bool is_big_endian = parameters->target().is_big_endian();
+ if (size == 32)
+ {
+ if (is_big_endian)
+ {
+#ifdef HAVE_TARGET_32_BIG
+ parameters->sized_target<32, true>()->merge_gnu_properties(object);
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ {
+#ifdef HAVE_TARGET_32_LITTLE
+ parameters->sized_target<32, false>()->merge_gnu_properties(object);
+#else
+ gold_unreachable();
+#endif
+ }
+ }
+ else if (size == 64)
+ {
+ if (is_big_endian)
+ {
+#ifdef HAVE_TARGET_64_BIG
+ parameters->sized_target<64, true>()->merge_gnu_properties(object);
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ {
+#ifdef HAVE_TARGET_64_LITTLE
+ parameters->sized_target<64, false>()->merge_gnu_properties(object);
+#else
+ gold_unreachable();
+#endif
+ }
+ }
+ else
+ gold_unreachable();
+}
+
+// Add a target-specific property for the output .note.gnu.property section.
+
+void
+Layout::add_gnu_property(unsigned int note_type,
+ unsigned int pr_type,
+ size_t pr_datasz,
+ const unsigned char* pr_data)
+{
+ gold_assert(note_type == elfcpp::NT_GNU_PROPERTY_TYPE_0);
+
+ Gnu_property prop;
+ prop.pr_datasz = pr_datasz;
+ prop.pr_data = new unsigned char[pr_datasz];
+ memcpy(prop.pr_data, pr_data, pr_datasz);
+ this->gnu_properties_[pr_type] = prop;
+}
+