diff options
| -rw-r--r-- | gold/gold.h | 4 | ||||
| -rw-r--r-- | gold/layout.cc | 75 | ||||
| -rw-r--r-- | gold/layout.h | 4 | ||||
| -rw-r--r-- | gold/version.cc | 8 |
4 files changed, 91 insertions, 0 deletions
diff --git a/gold/gold.h b/gold/gold.h index 91669ee..63bcb79 100644 --- a/gold/gold.h +++ b/gold/gold.h @@ -211,6 +211,10 @@ extern void do_gold_unreachable(const char*, int, const char*) extern void print_version(bool print_short); +// Get the version string. +extern const char* +get_version_string(); + // Queue up the first set of tasks. extern void queue_initial_tasks(const General_options&, diff --git a/gold/layout.cc b/gold/layout.cc index e878456..af91d41 100644 --- a/gold/layout.cc +++ b/gold/layout.cc @@ -521,6 +521,8 @@ Layout::finalize(const Input_objects* input_objects, Symbol_table* symtab) target->finalize_sections(this); + this->create_note_section(); + Output_segment* phdr_seg = NULL; if (input_objects->any_dynamic()) { @@ -606,6 +608,79 @@ Layout::finalize(const Input_objects* input_objects, Symbol_table* symtab) return off; } +// Create a .note section for an executable or shared library. This +// records the version of gold used to create the binary. + +void +Layout::create_note_section() +{ + if (parameters->output_is_object()) + return; + + const int size = parameters->get_size(); + + // The contents of the .note section. + const char* name = "GNU"; + std::string desc(std::string("gold ") + gold::get_version_string()); + size_t namesz = strlen(name) + 1; + size_t aligned_namesz = align_address(namesz, size / 8); + size_t descsz = desc.length() + 1; + size_t aligned_descsz = align_address(descsz, size / 8); + const int note_type = 4; + + size_t notesz = 3 * (size / 8) + aligned_namesz + aligned_descsz; + + unsigned char buffer[128]; + gold_assert(sizeof buffer >= notesz); + memset(buffer, 0, notesz); + + bool is_big_endian = parameters->is_big_endian(); + + if (size == 32) + { + if (!is_big_endian) + { + elfcpp::Swap<32, false>::writeval(buffer, namesz); + elfcpp::Swap<32, false>::writeval(buffer + 4, descsz); + elfcpp::Swap<32, false>::writeval(buffer + 8, note_type); + } + else + { + elfcpp::Swap<32, true>::writeval(buffer, namesz); + elfcpp::Swap<32, true>::writeval(buffer + 4, descsz); + elfcpp::Swap<32, true>::writeval(buffer + 8, note_type); + } + } + else if (size == 64) + { + if (!is_big_endian) + { + elfcpp::Swap<64, false>::writeval(buffer, namesz); + elfcpp::Swap<64, false>::writeval(buffer + 8, descsz); + elfcpp::Swap<64, false>::writeval(buffer + 16, note_type); + } + else + { + elfcpp::Swap<64, true>::writeval(buffer, namesz); + elfcpp::Swap<64, true>::writeval(buffer + 8, descsz); + elfcpp::Swap<64, true>::writeval(buffer + 16, note_type); + } + } + else + gold_unreachable(); + + memcpy(buffer + 3 * (size / 8), name, namesz); + memcpy(buffer + 3 * (size / 8) + aligned_namesz, desc.data(), descsz); + + const char* note_name = this->namepool_.add(".note", NULL); + Output_section* os = this->make_output_section(note_name, + elfcpp::SHT_NOTE, + 0); + Output_section_data* posd = new Output_data_const(buffer, notesz, + size / 8); + os->add_output_section_data(posd); +} + // Return whether SEG1 should be before SEG2 in the output file. This // is based entirely on the segment type and flags. When this is // called the segment addresses has normally not yet been set. diff --git a/gold/layout.h b/gold/layout.h index 3e09d62..90cc22b 100644 --- a/gold/layout.h +++ b/gold/layout.h @@ -213,6 +213,10 @@ class Layout const elfcpp::Shdr<size, big_endian>&, Output_section*, off_t*); + // Create a .note section for gold. + void + create_note_section(); + // Find the first read-only PT_LOAD segment, creating one if // necessary. Output_segment* diff --git a/gold/version.cc b/gold/version.cc index d7ad19c..dda3d7e 100644 --- a/gold/version.cc +++ b/gold/version.cc @@ -55,4 +55,12 @@ This program has absolutely no warranty.\n")); } } +// Return the version string. + +const char* +get_version_string() +{ + return version_string; +} + } // End namespace gold. |