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- #include <AK/StringBuilder.h>
- #include <LibELF/ELFDynamicObject.h>
- #include <assert.h>
- #include <mman.h>
- #include <stdio.h>
- #include <stdlib.h>
- #define DYNAMIC_LOAD_DEBUG
- //#define DYNAMIC_LOAD_VERBOSE
- #ifdef DYNAMIC_LOAD_VERBOSE
- # define VERBOSE(fmt, ...) dbgprintf(fmt, ##__VA_ARGS__)
- #else
- # define VERBOSE(fmt, ...) \
- do { \
- } while (0)
- #endif
- static bool s_always_bind_now = false;
- static const char* name_for_dtag(Elf32_Sword tag);
- // SYSV ELF hash algorithm
- // Note that the GNU HASH algorithm has less collisions
- static uint32_t calculate_elf_hash(const char* name)
- {
- uint32_t hash = 0;
- uint32_t top_nibble_of_hash = 0;
- while (*name != '\0') {
- hash = hash << 4;
- hash += *name;
- name++;
- top_nibble_of_hash = hash & 0xF0000000U;
- if (top_nibble_of_hash != 0)
- hash ^= top_nibble_of_hash >> 24;
- hash &= ~top_nibble_of_hash;
- }
- return hash;
- }
- NonnullRefPtr<ELFDynamicObject> ELFDynamicObject::construct(const char* filename, int fd, size_t size)
- {
- return adopt(*new ELFDynamicObject(filename, fd, size));
- }
- ELFDynamicObject::ELFDynamicObject(const char* filename, int fd, size_t size)
- : m_filename(filename)
- , m_file_size(size)
- , m_image_fd(fd)
- {
- String file_mmap_name = String::format("ELF_DYN: %s", m_filename.characters());
- m_file_mapping = mmap_with_name(nullptr, size, PROT_READ, MAP_PRIVATE, m_image_fd, 0, file_mmap_name.characters());
- if (MAP_FAILED == m_file_mapping) {
- m_valid = false;
- return;
- }
- m_image = AK::make<ELFImage>((u8*)m_file_mapping);
- m_valid = m_image->is_valid() && m_image->parse() && m_image->is_dynamic();
- if (!m_valid) {
- return;
- }
- const ELFImage::DynamicSection probably_dynamic_section = m_image->dynamic_section();
- if (StringView(".dynamic") != probably_dynamic_section.name() || probably_dynamic_section.type() != SHT_DYNAMIC) {
- m_valid = false;
- return;
- }
- }
- ELFDynamicObject::~ELFDynamicObject()
- {
- if (MAP_FAILED != m_file_mapping)
- munmap(m_file_mapping, m_file_size);
- }
- void* ELFDynamicObject::symbol_for_name(const char* name)
- {
- // FIXME: If we enable gnu hash in the compiler, we should use that here instead
- // The algo is way better with less collisions
- uint32_t hash_value = calculate_elf_hash(name);
- u8* load_addr = m_text_region->load_address().as_ptr();
- // NOTE: We need to use the loaded hash/string/symbol tables here to get the right
- // addresses. The ones that are in the ELFImage won't cut it, they aren't relocated
- u32* hash_table_begin = (u32*)(load_addr + m_hash_table_offset);
- Elf32_Sym* symtab = (Elf32_Sym*)(load_addr + m_symbol_table_offset);
- const char* strtab = (const char*)load_addr + m_string_table_offset;
- size_t num_buckets = hash_table_begin[0];
- // This is here for completeness, but, since we're using the fact that every chain
- // will end at chain 0 (which means 'not found'), we don't need to check num_chains.
- // Interestingly, num_chains is required to be num_symbols
- //size_t num_chains = hash_table_begin[1];
- u32* buckets = &hash_table_begin[2];
- u32* chains = &buckets[num_buckets];
- for (u32 i = buckets[hash_value % num_buckets]; i; i = chains[i]) {
- if (strcmp(name, strtab + symtab[i].st_name) == 0) {
- void* symbol_address = load_addr + symtab[i].st_value;
- #ifdef DYNAMIC_LOAD_DEBUG
- dbgprintf("Returning dynamic symbol with index %d for %s: %p\n", i, strtab + symtab[i].st_name, symbol_address);
- #endif
- return symbol_address;
- }
- }
- return nullptr;
- }
- void ELFDynamicObject::dump()
- {
- auto dynamic_section = m_image->dynamic_section();
- StringBuilder builder;
- builder.append("\nd_tag tag_name value\n");
- size_t num_dynamic_sections = 0;
- dynamic_section.for_each_dynamic_entry([&](const ELFImage::DynamicSectionEntry& entry) {
- String name_field = String::format("(%s)", name_for_dtag(entry.tag()));
- builder.appendf("0x%08X %-17s0x%X\n", entry.tag(), name_field.characters(), entry.val());
- num_dynamic_sections++;
- return IterationDecision::Continue;
- });
- dbgprintf("Dynamic section at offset 0x%x contains %zu entries:\n", dynamic_section.offset(), num_dynamic_sections);
- dbgprintf(builder.to_string().characters());
- }
- void ELFDynamicObject::parse_dynamic_section()
- {
- auto dynamic_section = m_image->dynamic_section();
- dynamic_section.for_each_dynamic_entry([&](const ELFImage::DynamicSectionEntry& entry) {
- switch (entry.tag()) {
- case DT_INIT:
- m_init_offset = entry.ptr();
- break;
- case DT_FINI:
- m_fini_offset = entry.ptr();
- break;
- case DT_INIT_ARRAY:
- m_init_array_offset = entry.ptr();
- break;
- case DT_INIT_ARRAYSZ:
- m_init_array_size = entry.val();
- break;
- case DT_HASH:
- m_hash_table_offset = entry.ptr();
- break;
- case DT_SYMTAB:
- m_symbol_table_offset = entry.ptr();
- break;
- case DT_STRTAB:
- m_string_table_offset = entry.ptr();
- break;
- case DT_STRSZ:
- m_size_of_string_table = entry.val();
- break;
- case DT_SYMENT:
- m_size_of_symbol_table_entry = entry.val();
- break;
- case DT_PLTGOT:
- m_procedure_linkage_table_offset = entry.ptr();
- break;
- case DT_PLTRELSZ:
- m_size_of_plt_relocation_entry_list = entry.val();
- break;
- case DT_PLTREL:
- m_procedure_linkage_table_relocation_type = entry.val();
- ASSERT(m_procedure_linkage_table_relocation_type & (DT_REL | DT_RELA));
- break;
- case DT_JMPREL:
- m_plt_relocation_offset_location = entry.ptr();
- break;
- case DT_RELA:
- case DT_REL:
- m_relocation_table_offset = entry.ptr();
- break;
- case DT_RELASZ:
- case DT_RELSZ:
- m_size_of_relocation_table = entry.val();
- break;
- case DT_RELAENT:
- case DT_RELENT:
- m_size_of_relocation_entry = entry.val();
- break;
- case DT_RELACOUNT:
- case DT_RELCOUNT:
- m_number_of_relocations = entry.val();
- break;
- case DT_FLAGS:
- m_must_bind_now = entry.val() & DF_BIND_NOW;
- m_has_text_relocations = entry.val() & DF_TEXTREL;
- m_should_process_origin = entry.val() & DF_ORIGIN;
- m_has_static_thread_local_storage = entry.val() & DF_STATIC_TLS;
- m_requires_symbolic_symbol_resolution = entry.val() & DF_SYMBOLIC;
- break;
- case DT_TEXTREL:
- m_has_text_relocations = true; // This tag seems to exist for legacy reasons only?
- break;
- default:
- dbgprintf("ELFDynamicObject: DYNAMIC tag handling not implemented for DT_%s\n", name_for_dtag(entry.tag()));
- printf("ELFDynamicObject: DYNAMIC tag handling not implemented for DT_%s\n", name_for_dtag(entry.tag()));
- ASSERT_NOT_REACHED(); // FIXME: Maybe just break out here and return false?
- break;
- }
- return IterationDecision::Continue;
- });
- }
- typedef void (*InitFunc)();
- bool ELFDynamicObject::load(unsigned flags)
- {
- ASSERT(flags & RTLD_GLOBAL);
- ASSERT(flags & RTLD_LAZY);
- #ifdef DYNAMIC_LOAD_DEBUG
- dump();
- #endif
- #ifdef DYNAMIC_LOAD_VERBOSE
- m_image->dump();
- #endif
- parse_dynamic_section();
- load_program_headers();
- if (m_has_text_relocations) {
- if (0 > mprotect(m_text_region->load_address().as_ptr(), m_text_region->required_load_size(), PROT_READ | PROT_WRITE)) {
- perror("mprotect"); // FIXME: dlerror?
- return false;
- }
- }
- do_relocations();
- setup_plt_trampoline();
- // Clean up our setting of .text to PROT_READ | PROT_WRITE
- if (m_has_text_relocations) {
- if (0 > mprotect(m_text_region->load_address().as_ptr(), m_text_region->required_load_size(), PROT_READ | PROT_EXEC)) {
- perror("mprotect"); // FIXME: dlerror?
- return false;
- }
- }
- call_object_init_functions();
- #ifdef DYNAMIC_LOAD_DEBUG
- dbgprintf("Loaded %s\n", m_filename.characters());
- #endif
- // FIXME: return false sometimes? missing symbol etc
- return true;
- }
- void ELFDynamicObject::load_program_headers()
- {
- size_t total_required_allocation_size = 0;
- // FIXME: Can we re-use ELFLoader? This and what follows looks a lot like what's in there...
- // With the exception of using desired_load_address().offset(text_segment_begin)
- // It seems kinda gross to expect the program headers to be in a specific order..
- m_image->for_each_program_header([&](const ELFImage::ProgramHeader& program_header) {
- ProgramHeaderRegion new_region(program_header.raw_header());
- if (new_region.is_load())
- total_required_allocation_size += new_region.required_load_size();
- m_program_header_regions.append(move(new_region));
- auto& region = m_program_header_regions.last();
- if (region.is_tls_template())
- m_tls_region = ®ion;
- else if (region.is_load()) {
- if (region.is_executable())
- m_text_region = ®ion;
- else
- m_data_region = ®ion;
- }
- });
- ASSERT(m_text_region && m_data_region);
- // Process regions in order: .text, .data, .tls
- auto* region = m_text_region;
- void* text_segment_begin = mmap_with_name(nullptr, region->required_load_size(), region->mmap_prot(), MAP_PRIVATE, m_image_fd, region->offset(), String::format(".text: %s", m_filename.characters()).characters());
- size_t text_segment_size = region->required_load_size();
- region->set_base_address(VirtualAddress { (u32)text_segment_begin });
- region->set_load_address(VirtualAddress { (u32)text_segment_begin });
- region = m_data_region;
- void* data_segment_begin = mmap_with_name((u8*)text_segment_begin + text_segment_size, region->required_load_size(), region->mmap_prot(), MAP_ANONYMOUS | MAP_PRIVATE, 0, 0, String::format(".data: %s", m_filename.characters()).characters());
- size_t data_segment_size = region->required_load_size();
- VirtualAddress data_segment_actual_addr = region->desired_load_address().offset((u32)text_segment_begin);
- region->set_base_address(VirtualAddress { (u32)text_segment_begin });
- region->set_load_address(data_segment_actual_addr);
- memcpy(data_segment_actual_addr.as_ptr(), (u8*)m_file_mapping + region->offset(), region->size_in_image());
- if (m_tls_region) {
- region = m_data_region;
- VirtualAddress tls_segment_actual_addr = region->desired_load_address().offset((u32)text_segment_begin);
- region->set_base_address(VirtualAddress { (u32)text_segment_begin });
- region->set_load_address(tls_segment_actual_addr);
- memcpy(tls_segment_actual_addr.as_ptr(), (u8*)m_file_mapping + region->offset(), region->size_in_image());
- }
- // sanity check
- u8* end_of_in_memory_image = (u8*)data_segment_begin + data_segment_size;
- ASSERT((ptrdiff_t)total_required_allocation_size == (ptrdiff_t)(end_of_in_memory_image - (u8*)text_segment_begin));
- }
- void ELFDynamicObject::do_relocations()
- {
- auto dyn_relocation_section = m_image->dynamic_relocation_section();
- if (StringView(".rel.dyn") != dyn_relocation_section.name() || SHT_REL != dyn_relocation_section.type()) {
- ASSERT_NOT_REACHED();
- }
- u8* load_base_address = m_text_region->base_address().as_ptr();
- int i = -1;
- // FIXME: We should really bail on undefined symbols here. (but, there's some TLS vars that are currently undef soooo.... :) )
- dyn_relocation_section.for_each_relocation([&](const ELFImage::DynamicRelocation& relocation) {
- ++i;
- VERBOSE("====== RELOCATION %d: offset 0x%08X, type %d, symidx %08X\n", i, relocation.offset(), relocation.type(), relocation.symbol_index());
- u32* patch_ptr = (u32*)(load_base_address + relocation.offset());
- switch (relocation.type()) {
- case R_386_NONE:
- // Apparently most loaders will just skip these?
- // Seems if the 'link editor' generates one something is funky with your code
- VERBOSE("None relocation. No symbol, no nothin.\n");
- break;
- case R_386_32: {
- auto symbol = relocation.symbol();
- VERBOSE("Absolute relocation: name: '%s', value: %p\n", symbol.name(), symbol.value());
- if (symbol.bind() == STB_LOCAL) {
- u32 symbol_address = symbol.section().address() + symbol.value();
- *patch_ptr += symbol_address;
- } else if (symbol.bind() == STB_GLOBAL) {
- u32 symbol_address = symbol.value() + (u32)load_base_address;
- *patch_ptr += symbol_address;
- } else if (symbol.bind() == STB_WEAK) {
- // FIXME: Handle weak symbols...
- dbgprintf("ELFDynamicObject: Ignoring weak symbol %s\n", symbol.name());
- } else {
- VERBOSE("Found new fun symbol bind value %d\n", symbol.bind());
- ASSERT_NOT_REACHED();
- }
- VERBOSE(" Symbol address: %p\n", *patch_ptr);
- break;
- }
- case R_386_PC32: {
- auto symbol = relocation.symbol();
- VERBOSE("PC-relative relocation: '%s', value: %p\n", symbol.name(), symbol.value());
- u32 relative_offset = (symbol.value() - relocation.offset());
- *patch_ptr += relative_offset;
- VERBOSE(" Symbol address: %p\n", *patch_ptr);
- break;
- }
- case R_386_GLOB_DAT: {
- auto symbol = relocation.symbol();
- VERBOSE("Global data relocation: '%s', value: %p\n", symbol.name(), symbol.value());
- u32 symbol_location = (u32)(m_data_region->base_address().as_ptr() + symbol.value());
- *patch_ptr = symbol_location;
- VERBOSE(" Symbol address: %p\n", *patch_ptr);
- break;
- }
- case R_386_RELATIVE: {
- // FIXME: According to the spec, R_386_relative ones must be done first.
- // We could explicitly do them first using m_number_of_relocatoins from DT_RELCOUNT
- // However, our compiler is nice enough to put them at the front of the relocations for us :)
- VERBOSE("Load address relocation at offset %X\n", relocation.offset());
- VERBOSE(" patch ptr == %p, adding load base address (%p) to it and storing %p\n", *patch_ptr, load_base_address, *patch_ptr + (u32)load_base_address);
- *patch_ptr += (u32)load_base_address; // + addend for RelA (addend for Rel is stored at addr)
- break;
- }
- case R_386_TLS_TPOFF: {
- VERBOSE("Relocation type: R_386_TLS_TPOFF at offset %X\n", relocation.offset());
- // FIXME: this can't be right? I have no idea what "negative offset into TLS storage" means...
- // FIXME: Check m_has_static_tls and do something different for dynamic TLS
- VirtualAddress tls_region_loctation = m_tls_region->desired_load_address();
- *patch_ptr = relocation.offset() - (u32)tls_region_loctation.as_ptr() - *patch_ptr;
- break;
- }
- default:
- // Raise the alarm! Someone needs to implement this relocation type
- dbgprintf("Found a new exciting relocation type %d\n", relocation.type());
- printf("ELFDynamicObject: Found unknown relocation type %d\n", relocation.type());
- ASSERT_NOT_REACHED();
- break;
- }
- return IterationDecision::Continue;
- });
- // Handle PLT Global offset table relocations.
- for (size_t idx = 0; idx < m_size_of_plt_relocation_entry_list; idx += m_size_of_relocation_entry) {
- // FIXME: Or BIND_NOW flag passed in?
- if (m_must_bind_now || s_always_bind_now) {
- // Eagerly BIND_NOW the PLT entries, doing all the symbol looking goodness
- // The patch method returns the address for the LAZY fixup path, but we don't need it here
- (void)patch_plt_entry(idx);
- } else {
- // LAZY-ily bind the PLT slots by just adding the base address to the offsets stored there
- // This avoids doing symbol lookup, which might be expensive
- VirtualAddress relocation_vaddr = m_text_region->load_address().offset(m_plt_relocation_offset_location).offset(idx);
- Elf32_Rel* jump_slot_relocation = (Elf32_Rel*)relocation_vaddr.as_ptr();
- ASSERT(ELF32_R_TYPE(jump_slot_relocation->r_info) == R_386_JMP_SLOT);
- auto* image_base_address = m_text_region->base_address().as_ptr();
- u8* relocation_address = image_base_address + jump_slot_relocation->r_offset;
- *(u32*)relocation_address += (u32)image_base_address;
- }
- }
- #ifdef DYNAMIC_LOAD_DEBUG
- dbgprintf("Done relocating!\n");
- #endif
- }
- // Defined in <arch>/plt_trampoline.S
- extern "C" void _plt_trampoline(void) __attribute__((visibility("hidden")));
- void ELFDynamicObject::setup_plt_trampoline()
- {
- const ELFImage::Section& got_section = m_image->lookup_section(".got.plt");
- VirtualAddress got_address = m_text_region->load_address().offset(got_section.address());
- u32* got_u32_ptr = reinterpret_cast<u32*>(got_address.as_ptr());
- got_u32_ptr[1] = (u32)this;
- got_u32_ptr[2] = (u32)&_plt_trampoline;
- #ifdef DYNAMIC_LOAD_DEBUG
- dbgprintf("Set GOT PLT entries at %p offset(%p): [0] = %p [1] = %p, [2] = %p\n", got_u32_ptr, got_section.offset(), got_u32_ptr[0], got_u32_ptr[1], got_u32_ptr[2]);
- #endif
- }
- // Called from our ASM routine _plt_trampoline
- extern "C" Elf32_Addr _fixup_plt_entry(ELFDynamicObject* object, u32 relocation_idx)
- {
- return object->patch_plt_entry(relocation_idx);
- }
- // offset is in PLT relocation table
- Elf32_Addr ELFDynamicObject::patch_plt_entry(u32 relocation_idx)
- {
- VirtualAddress plt_relocation_table_address = m_text_region->load_address().offset(m_plt_relocation_offset_location);
- VirtualAddress relocation_entry_address = plt_relocation_table_address.offset(relocation_idx);
- Elf32_Rel* jump_slot_relocation = (Elf32_Rel*)relocation_entry_address.as_ptr();
- ASSERT(ELF32_R_TYPE(jump_slot_relocation->r_info) == R_386_JMP_SLOT);
- auto sym = m_image->dynamic_symbol(ELF32_R_SYM(jump_slot_relocation->r_info));
- auto* image_base_address = m_text_region->base_address().as_ptr();
- u8* relocation_address = image_base_address + jump_slot_relocation->r_offset;
- u32 symbol_location = (u32)(image_base_address + sym.value());
- VERBOSE("ELFDynamicObject: Jump slot relocation: putting %s (%p) into PLT at %p\n", sym.name(), symbol_location, relocation_address);
- *(u32*)relocation_address = symbol_location;
- return symbol_location;
- }
- void ELFDynamicObject::call_object_init_functions()
- {
- u8* load_addr = m_text_region->load_address().as_ptr();
- InitFunc init_function = (InitFunc)(load_addr + m_init_offset);
- #ifdef DYNAMIC_LOAD_DEBUG
- dbgprintf("Calling DT_INIT at %p\n", init_function);
- #endif
- (init_function)();
- InitFunc* init_begin = (InitFunc*)(load_addr + m_init_array_offset);
- u32 init_end = (u32)((u8*)init_begin + m_init_array_size);
- while ((u32)init_begin < init_end) {
- // Andriod sources claim that these can be -1, to be ignored.
- // 0 definitely shows up. Apparently 0/-1 are valid? Confusing.
- if (!*init_begin || ((i32)*init_begin == -1))
- continue;
- #ifdef DYNAMIC_LOAD_DEBUG
- dbgprintf("Calling DT_INITARRAY entry at %p\n", *init_begin);
- #endif
- (*init_begin)();
- ++init_begin;
- }
- }
- u32 ELFDynamicObject::ProgramHeaderRegion::mmap_prot() const
- {
- int prot = 0;
- prot |= is_executable() ? PROT_EXEC : 0;
- prot |= is_readable() ? PROT_READ : 0;
- prot |= is_writable() ? PROT_WRITE : 0;
- return prot;
- }
- static const char* name_for_dtag(Elf32_Sword d_tag)
- {
- switch (d_tag) {
- case DT_NULL:
- return "NULL"; /* marks end of _DYNAMIC array */
- case DT_NEEDED:
- return "NEEDED"; /* string table offset of needed lib */
- case DT_PLTRELSZ:
- return "PLTRELSZ"; /* size of relocation entries in PLT */
- case DT_PLTGOT:
- return "PLTGOT"; /* address PLT/GOT */
- case DT_HASH:
- return "HASH"; /* address of symbol hash table */
- case DT_STRTAB:
- return "STRTAB"; /* address of string table */
- case DT_SYMTAB:
- return "SYMTAB"; /* address of symbol table */
- case DT_RELA:
- return "RELA"; /* address of relocation table */
- case DT_RELASZ:
- return "RELASZ"; /* size of relocation table */
- case DT_RELAENT:
- return "RELAENT"; /* size of relocation entry */
- case DT_STRSZ:
- return "STRSZ"; /* size of string table */
- case DT_SYMENT:
- return "SYMENT"; /* size of symbol table entry */
- case DT_INIT:
- return "INIT"; /* address of initialization func. */
- case DT_FINI:
- return "FINI"; /* address of termination function */
- case DT_SONAME:
- return "SONAME"; /* string table offset of shared obj */
- case DT_RPATH:
- return "RPATH"; /* string table offset of library search path */
- case DT_SYMBOLIC:
- return "SYMBOLIC"; /* start sym search in shared obj. */
- case DT_REL:
- return "REL"; /* address of rel. tbl. w addends */
- case DT_RELSZ:
- return "RELSZ"; /* size of DT_REL relocation table */
- case DT_RELENT:
- return "RELENT"; /* size of DT_REL relocation entry */
- case DT_PLTREL:
- return "PLTREL"; /* PLT referenced relocation entry */
- case DT_DEBUG:
- return "DEBUG"; /* bugger */
- case DT_TEXTREL:
- return "TEXTREL"; /* Allow rel. mod. to unwritable seg */
- case DT_JMPREL:
- return "JMPREL"; /* add. of PLT's relocation entries */
- case DT_BIND_NOW:
- return "BIND_NOW"; /* Bind now regardless of env setting */
- case DT_INIT_ARRAY:
- return "INIT_ARRAY"; /* address of array of init func */
- case DT_FINI_ARRAY:
- return "FINI_ARRAY"; /* address of array of term func */
- case DT_INIT_ARRAYSZ:
- return "INIT_ARRAYSZ"; /* size of array of init func */
- case DT_FINI_ARRAYSZ:
- return "FINI_ARRAYSZ"; /* size of array of term func */
- case DT_RUNPATH:
- return "RUNPATH"; /* strtab offset of lib search path */
- case DT_FLAGS:
- return "FLAGS"; /* Set of DF_* flags */
- case DT_ENCODING:
- return "ENCODING"; /* further DT_* follow encoding rules */
- case DT_PREINIT_ARRAY:
- return "PREINIT_ARRAY"; /* address of array of preinit func */
- case DT_PREINIT_ARRAYSZ:
- return "PREINIT_ARRAYSZ"; /* size of array of preinit func */
- case DT_LOOS:
- return "LOOS"; /* reserved range for OS */
- case DT_HIOS:
- return "HIOS"; /* specific dynamic array tags */
- case DT_LOPROC:
- return "LOPROC"; /* reserved range for processor */
- case DT_HIPROC:
- return "HIPROC"; /* specific dynamic array tags */
- case DT_GNU_HASH:
- return "GNU_HASH"; /* address of GNU hash table */
- case DT_RELACOUNT:
- return "RELACOUNT"; /* if present, number of RELATIVE */
- case DT_RELCOUNT:
- return "RELCOUNT"; /* relocs, which must come first */
- case DT_FLAGS_1:
- return "FLAGS_1";
- default:
- return "??";
- }
- }
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