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authorIan Moffett <ian@osmora.org>2024-03-07 17:28:52 -0500
committerIan Moffett <ian@osmora.org>2024-03-07 18:24:51 -0500
commitf5e48e94a2f4d4bbd6e5628c7f2afafc6dbcc459 (patch)
tree93b156621dc0303816b37f60ba88051b702d92f6 /lib/mlibc/options/rtdl/generic/linker.cpp
parentbd5969fc876a10b18613302db7087ef3c40f18e1 (diff)
build: Build mlibc + add distclean target
Signed-off-by: Ian Moffett <ian@osmora.org>
Diffstat (limited to 'lib/mlibc/options/rtdl/generic/linker.cpp')
-rw-r--r--lib/mlibc/options/rtdl/generic/linker.cpp1872
1 files changed, 0 insertions, 1872 deletions
diff --git a/lib/mlibc/options/rtdl/generic/linker.cpp b/lib/mlibc/options/rtdl/generic/linker.cpp
deleted file mode 100644
index a519c35..0000000
--- a/lib/mlibc/options/rtdl/generic/linker.cpp
+++ /dev/null
@@ -1,1872 +0,0 @@
-#include <mlibc/arch-defs.hpp>
-#include <stdint.h>
-#include <string.h>
-
-// keep a list of optional generic relocation types
-enum {
- R_OFFSET = (uintptr_t) -1,
-};
-
-
-#include <frg/manual_box.hpp>
-#include <frg/small_vector.hpp>
-#include <mlibc/allocator.hpp>
-#include <mlibc/debug.hpp>
-#include <mlibc/rtdl-sysdeps.hpp>
-#include <mlibc/rtdl-abi.hpp>
-#include <mlibc/thread.hpp>
-#include <abi-bits/fcntl.h>
-#include <internal-config.h>
-
-#include "elf.hpp"
-#include "linker.hpp"
-
-#if !MLIBC_MMAP_ALLOCATE_DSO
-uintptr_t libraryBase = 0x41000000;
-#endif
-
-constexpr bool verbose = false;
-constexpr bool stillSlightlyVerbose = false;
-constexpr bool logBaseAddresses = false;
-constexpr bool logRpath = false;
-constexpr bool logLdPath = false;
-constexpr bool eagerBinding = true;
-
-#if defined(__x86_64__) || defined(__i386__)
-constexpr inline bool tlsAboveTp = false;
-#elif defined(__aarch64__)
-constexpr inline bool tlsAboveTp = true;
-#elif defined(__riscv)
-constexpr inline bool tlsAboveTp = true;
-#else
-# error Unknown architecture
-#endif
-
-extern DebugInterface globalDebugInterface;
-extern uintptr_t __stack_chk_guard;
-
-extern frg::manual_box<frg::small_vector<frg::string_view, 4, MemoryAllocator>> libraryPaths;
-extern frg::manual_box<frg::vector<frg::string_view, MemoryAllocator>> preloads;
-
-#if MLIBC_STATIC_BUILD
-extern "C" size_t __init_array_start[];
-extern "C" size_t __init_array_end[];
-extern "C" size_t __preinit_array_start[];
-extern "C" size_t __preinit_array_end[];
-#endif
-
-size_t tlsMaxAlignment = 16;
-
-// This is the global "resolution timestamp" (RTS) counter.
-// It is incremented each time __dlapi_open() (i.e. dlopen()) is called.
-// Each DSO stores its objectRts (i.e. RTS at the time the object was loaded).
-// DSOs in the global scope also store a globalRts (i.e. RTS at the time the
-// object became global). This mechanism is used to determine which
-// part of the global scope is considered for symbol resolution.
-uint64_t rtsCounter = 2;
-
-bool trySeek(int fd, int64_t offset) {
- off_t noff;
- return mlibc::sys_seek(fd, offset, SEEK_SET, &noff) == 0;
-}
-
-bool tryReadExactly(int fd, void *data, size_t length) {
- size_t offset = 0;
- while(offset < length) {
- ssize_t chunk;
- if(mlibc::sys_read(fd, reinterpret_cast<char *>(data) + offset,
- length - offset, &chunk))
- return false;
- __ensure(chunk > 0);
- offset += chunk;
- }
- __ensure(offset == length);
- return true;
-}
-
-void closeOrDie(int fd) {
- if(mlibc::sys_close(fd))
- __ensure(!"sys_close() failed");
-}
-
-uintptr_t alignUp(uintptr_t address, size_t align) {
- return (address + align - 1) & ~(align - 1);
-}
-
-// --------------------------------------------------------
-// ObjectRepository
-// --------------------------------------------------------
-
-ObjectRepository::ObjectRepository()
-: loadedObjects{getAllocator()},
- _nameMap{frg::hash<frg::string_view>{}, getAllocator()} {}
-
-SharedObject *ObjectRepository::injectObjectFromDts(frg::string_view name,
- frg::string<MemoryAllocator> path, uintptr_t base_address,
- elf_dyn *dynamic, uint64_t rts) {
- __ensure(!findLoadedObject(name));
-
- auto object = frg::construct<SharedObject>(getAllocator(),
- name.data(), std::move(path), false, globalScope.get(), rts);
- object->baseAddress = base_address;
- object->dynamic = dynamic;
- _parseDynamic(object);
-
- _addLoadedObject(object);
- _discoverDependencies(object, globalScope.get(), rts);
-
- return object;
-}
-
-SharedObject *ObjectRepository::injectObjectFromPhdrs(frg::string_view name,
- frg::string<MemoryAllocator> path, void *phdr_pointer,
- size_t phdr_entry_size, size_t num_phdrs, void *entry_pointer,
- uint64_t rts) {
- __ensure(!findLoadedObject(name));
-
- auto object = frg::construct<SharedObject>(getAllocator(),
- name.data(), std::move(path), true, globalScope.get(), rts);
- _fetchFromPhdrs(object, phdr_pointer, phdr_entry_size, num_phdrs, entry_pointer);
- _parseDynamic(object);
-
- _addLoadedObject(object);
- _discoverDependencies(object, globalScope.get(), rts);
-
- return object;
-}
-
-SharedObject *ObjectRepository::injectStaticObject(frg::string_view name,
- frg::string<MemoryAllocator> path, void *phdr_pointer,
- size_t phdr_entry_size, size_t num_phdrs, void *entry_pointer,
- uint64_t rts) {
- __ensure(!findLoadedObject(name));
- auto object = frg::construct<SharedObject>(getAllocator(),
- name.data(), std::move(path), true, globalScope.get(), rts);
- _fetchFromPhdrs(object, phdr_pointer, phdr_entry_size, num_phdrs, entry_pointer);
-
-#if MLIBC_STATIC_BUILD
- object->initArray = reinterpret_cast<InitFuncPtr*>(__init_array_start);
- object->initArraySize = static_cast<size_t>((uintptr_t)__init_array_end -
- (uintptr_t)__init_array_start);
- object->preInitArray = reinterpret_cast<InitFuncPtr*>(__preinit_array_start);
- object->preInitArraySize = static_cast<size_t>((uintptr_t)__preinit_array_end -
- (uintptr_t)__preinit_array_start);
-#endif
-
- _addLoadedObject(object);
-
- return object;
-}
-
-frg::expected<LinkerError, SharedObject *> ObjectRepository::requestObjectWithName(frg::string_view name,
- SharedObject *origin, Scope *localScope, bool createScope, uint64_t rts) {
- if (auto obj = findLoadedObject(name))
- return obj;
-
- auto tryToOpen = [&] (const char *path) {
- int fd;
- if(auto x = mlibc::sys_open(path, O_RDONLY, 0, &fd); x) {
- return -1;
- }
- return fd;
- };
-
- // TODO(arsen): this process can probably undergo heavy optimization, by
- // preprocessing the rpath only once on parse
- auto processRpath = [&] (frg::string_view path) {
- frg::string<MemoryAllocator> sPath { getAllocator() };
- if (path.starts_with("$ORIGIN")) {
- frg::string_view dirname = origin->path;
- auto lastsl = dirname.find_last('/');
- if (lastsl != size_t(-1)) {
- dirname = dirname.sub_string(0, lastsl);
- } else {
- dirname = ".";
- }
- sPath = frg::string<MemoryAllocator>{ getAllocator(), dirname };
- sPath += path.sub_string(7, path.size() - 7);
- } else {
- sPath = frg::string<MemoryAllocator>{ getAllocator(), path };
- }
- if (sPath[sPath.size() - 1] != '/') {
- sPath += '/';
- }
- sPath += name;
- if (logRpath)
- mlibc::infoLogger() << "rtdl: trying in rpath " << sPath << frg::endlog;
- int fd = tryToOpen(sPath.data());
- if (logRpath && fd >= 0)
- mlibc::infoLogger() << "rtdl: found in rpath" << frg::endlog;
- return frg::tuple { fd, std::move(sPath) };
- };
-
- frg::string<MemoryAllocator> chosenPath { getAllocator() };
- int fd = -1;
- if (origin && origin->runPath) {
- size_t start = 0;
- size_t idx = 0;
- frg::string_view rpath { origin->runPath };
- auto next = [&] () {
- idx = rpath.find_first(':', start);
- if (idx == (size_t)-1)
- idx = rpath.size();
- };
- for (next(); idx < rpath.size(); next()) {
- auto path = rpath.sub_string(start, idx - start);
- start = idx + 1;
- auto [fd_, fullPath] = processRpath(path);
- if (fd_ != -1) {
- fd = fd_;
- chosenPath = std::move(fullPath);
- break;
- }
- }
- if (fd == -1) {
- auto path = rpath.sub_string(start, rpath.size() - start);
- auto [fd_, fullPath] = processRpath(path);
- if (fd_ != -1) {
- fd = fd_;
- chosenPath = std::move(fullPath);
- }
- }
- } else if (logRpath) {
- mlibc::infoLogger() << "rtdl: no rpath set for object" << frg::endlog;
- }
-
- for(size_t i = 0; i < libraryPaths->size() && fd == -1; i++) {
- auto ldPath = (*libraryPaths)[i];
- auto path = frg::string<MemoryAllocator>{getAllocator(), ldPath} + '/' + name;
- if(logLdPath)
- mlibc::infoLogger() << "rtdl: Trying to load " << name << " from ldpath " << ldPath << "/" << frg::endlog;
- fd = tryToOpen(path.data());
- if(fd >= 0) {
- chosenPath = std::move(path);
- break;
- }
- }
- if(fd == -1)
- return LinkerError::notFound;
-
- if (createScope) {
- __ensure(localScope == nullptr);
-
- // TODO: Free this when the scope is no longer needed.
- localScope = frg::construct<Scope>(getAllocator());
- }
-
- __ensure(localScope != nullptr);
-
- auto object = frg::construct<SharedObject>(getAllocator(),
- name.data(), std::move(chosenPath), false, localScope, rts);
-
- auto result = _fetchFromFile(object, fd);
- closeOrDie(fd);
- if(!result) {
- frg::destruct(getAllocator(), object);
- return result.error();
- }
-
- _parseDynamic(object);
-
- _addLoadedObject(object);
- _discoverDependencies(object, localScope, rts);
-
- return object;
-}
-
-frg::expected<LinkerError, SharedObject *> ObjectRepository::requestObjectAtPath(frg::string_view path,
- Scope *localScope, bool createScope, uint64_t rts) {
- // TODO: Support SONAME correctly.
- auto lastSlash = path.find_last('/') + 1;
- auto name = path;
- if (!lastSlash) {
- name = name.sub_string(lastSlash, path.size() - lastSlash);
- }
- if (auto obj = findLoadedObject(name))
- return obj;
-
- if (createScope) {
- __ensure(localScope == nullptr);
-
- // TODO: Free this when the scope is no longer needed.
- localScope = frg::construct<Scope>(getAllocator());
- }
-
- __ensure(localScope != nullptr);
-
- auto object = frg::construct<SharedObject>(getAllocator(),
- name.data(), path.data(), false, localScope, rts);
-
- frg::string<MemoryAllocator> no_prefix(getAllocator(), path);
-
- int fd;
- if(mlibc::sys_open((no_prefix + '\0').data(), O_RDONLY, 0, &fd)) {
- frg::destruct(getAllocator(), object);
- return LinkerError::notFound;
- }
- auto result = _fetchFromFile(object, fd);
- closeOrDie(fd);
- if(!result) {
- frg::destruct(getAllocator(), object);
- return result.error();
- }
-
- _parseDynamic(object);
-
- _addLoadedObject(object);
- _discoverDependencies(object, localScope, rts);
-
- return object;
-}
-
-SharedObject *ObjectRepository::findCaller(void *addr) {
- uintptr_t target = reinterpret_cast<uintptr_t>(addr);
-
- for (auto [name, object] : _nameMap) {
- // Search all PT_LOAD segments for the specified address.
- for(size_t j = 0; j < object->phdrCount; j++) {
- auto phdr = (elf_phdr *)((uintptr_t)object->phdrPointer + j * object->phdrEntrySize);
- if (phdr->p_type == PT_LOAD) {
- uintptr_t start = object->baseAddress + phdr->p_vaddr;
- uintptr_t end = start + phdr->p_memsz;
- if (start <= target && target < end)
- return object;
- }
- }
- }
-
- return nullptr;
-}
-
-SharedObject *ObjectRepository::findLoadedObject(frg::string_view name) {
- auto it = _nameMap.get(name);
- if (it)
- return *it;
-
- for (auto object : loadedObjects) {
- // See if any object has a matching SONAME.
- if (object->soName && name == object->soName)
- return object;
- }
-
- // TODO: We should also look at the device and inode here as a fallback.
- return nullptr;
-}
-
-// --------------------------------------------------------
-// ObjectRepository: Fetching methods.
-// --------------------------------------------------------
-
-void ObjectRepository::_fetchFromPhdrs(SharedObject *object, void *phdr_pointer,
- size_t phdr_entry_size, size_t phdr_count, void *entry_pointer) {
- __ensure(object->isMainObject);
- object->phdrPointer = phdr_pointer;
- object->phdrEntrySize = phdr_entry_size;
- object->phdrCount = phdr_count;
- if(verbose)
- mlibc::infoLogger() << "rtdl: Loading " << object->name << frg::endlog;
-
- // Note: the entry pointer is absolute and not relative to the base address.
- object->entry = entry_pointer;
-
- frg::optional<ptrdiff_t> dynamic_offset;
- frg::optional<ptrdiff_t> tls_offset;
-
- // segments are already mapped, so we just have to find the dynamic section
- for(size_t i = 0; i < phdr_count; i++) {
- auto phdr = (elf_phdr *)((uintptr_t)phdr_pointer + i * phdr_entry_size);
- switch(phdr->p_type) {
- case PT_PHDR:
- // Determine the executable's base address (in the PIE case) by comparing
- // the PHDR segment's load address against it's address in the ELF file.
- object->baseAddress = reinterpret_cast<uintptr_t>(phdr_pointer) - phdr->p_vaddr;
- if(verbose)
- mlibc::infoLogger() << "rtdl: Executable is loaded at "
- << (void *)object->baseAddress << frg::endlog;
- break;
- case PT_DYNAMIC:
- dynamic_offset = phdr->p_vaddr;
- break;
- case PT_TLS: {
- object->tlsSegmentSize = phdr->p_memsz;
- object->tlsAlignment = phdr->p_align;
- object->tlsImageSize = phdr->p_filesz;
- tls_offset = phdr->p_vaddr;
- break;
- case PT_INTERP:
- object->interpreterPath = frg::string<MemoryAllocator>{
- (char*)(object->baseAddress + phdr->p_vaddr),
- getAllocator()
- };
- } break;
- default:
- //FIXME warn about unknown phdrs
- break;
- }
- }
-
- if(dynamic_offset)
- object->dynamic = (elf_dyn *)(object->baseAddress + *dynamic_offset);
- if(tls_offset)
- object->tlsImagePtr = (void *)(object->baseAddress + *tls_offset);
-}
-
-
-frg::expected<LinkerError, void> ObjectRepository::_fetchFromFile(SharedObject *object, int fd) {
- __ensure(!object->isMainObject);
-
- // read the elf file header
- elf_ehdr ehdr;
- if(!tryReadExactly(fd, &ehdr, sizeof(elf_ehdr)))
- return LinkerError::fileTooShort;
-
- if(ehdr.e_ident[0] != 0x7F
- || ehdr.e_ident[1] != 'E'
- || ehdr.e_ident[2] != 'L'
- || ehdr.e_ident[3] != 'F')
- return LinkerError::notElf;
-
- if((ehdr.e_type != ET_EXEC && ehdr.e_type != ET_DYN)
- || ehdr.e_machine != ELF_MACHINE
- || ehdr.e_ident[EI_CLASS] != ELF_CLASS)
- return LinkerError::wrongElfType;
-
- // read the elf program headers
- auto phdr_buffer = (char *)getAllocator().allocate(ehdr.e_phnum * ehdr.e_phentsize);
- if(!phdr_buffer)
- return LinkerError::outOfMemory;
-
- if(!trySeek(fd, ehdr.e_phoff)) {
- getAllocator().deallocate(phdr_buffer, ehdr.e_phnum * ehdr.e_phentsize);
- return LinkerError::invalidProgramHeader;
- }
- if(!tryReadExactly(fd, phdr_buffer, ehdr.e_phnum * ehdr.e_phentsize)) {
- getAllocator().deallocate(phdr_buffer, ehdr.e_phnum * ehdr.e_phentsize);
- return LinkerError::invalidProgramHeader;
- }
-
- object->phdrPointer = phdr_buffer;
- object->phdrCount = ehdr.e_phnum;
- object->phdrEntrySize = ehdr.e_phentsize;
-
- // Allocate virtual address space for the DSO.
- constexpr size_t hugeSize = 0x200000;
-
- uintptr_t highest_address = 0;
- for(int i = 0; i < ehdr.e_phnum; i++) {
- auto phdr = (elf_phdr *)(phdr_buffer + i * ehdr.e_phentsize);
-
- if(phdr->p_type != PT_LOAD)
- continue;
-
- auto limit = phdr->p_vaddr + phdr->p_memsz;
- if(limit > highest_address)
- highest_address = limit;
- }
-
- __ensure(!(object->baseAddress & (hugeSize - 1)));
-
- highest_address = (highest_address + mlibc::page_size - 1) & ~(mlibc::page_size - 1);
-
-#if MLIBC_MMAP_ALLOCATE_DSO
- void *mappedAddr = nullptr;
-
- if (mlibc::sys_vm_map(nullptr,
- highest_address - object->baseAddress, PROT_NONE,
- MAP_PRIVATE | MAP_ANONYMOUS, -1, 0, &mappedAddr)) {
- mlibc::infoLogger() << "sys_vm_map failed when allocating address space for DSO \""
- << object->name << "\""
- << ", base " << (void *)object->baseAddress
- << ", requested " << (highest_address - object->baseAddress) << " bytes"
- << frg::endlog;
- getAllocator().deallocate(phdr_buffer, ehdr.e_phnum * ehdr.e_phentsize);
- return LinkerError::outOfMemory;
- }
-
- object->baseAddress = reinterpret_cast<uintptr_t>(mappedAddr);
-#else
- object->baseAddress = libraryBase;
- libraryBase += (highest_address + (hugeSize - 1)) & ~(hugeSize - 1);
-#endif
-
- if(verbose || logBaseAddresses)
- mlibc::infoLogger() << "rtdl: Loading " << object->name
- << " at " << (void *)object->baseAddress << frg::endlog;
-
- // Load all segments.
- constexpr size_t pageSize = 0x1000;
- for(int i = 0; i < ehdr.e_phnum; i++) {
- auto phdr = (elf_phdr *)(phdr_buffer + i * ehdr.e_phentsize);
-
- if(phdr->p_type == PT_LOAD) {
- size_t misalign = phdr->p_vaddr & (pageSize - 1);
- __ensure(phdr->p_memsz > 0);
- __ensure(phdr->p_memsz >= phdr->p_filesz);
-
- // If the following condition is violated, we cannot use mmap() the segment;
- // however, GCC only generates ELF files that satisfy this.
- __ensure(misalign == (phdr->p_offset & (pageSize - 1)));
-
- auto map_address = object->baseAddress + phdr->p_vaddr - misalign;
- auto backed_map_size = (phdr->p_filesz + misalign + pageSize - 1) & ~(pageSize - 1);
- auto total_map_size = (phdr->p_memsz + misalign + pageSize - 1) & ~(pageSize - 1);
-
- int prot = 0;
- if(phdr->p_flags & PF_R)
- prot |= PROT_READ;
- if(phdr->p_flags & PF_W)
- prot |= PROT_WRITE;
- if(phdr->p_flags & PF_X)
- prot |= PROT_EXEC;
-
- #if MLIBC_MAP_DSO_SEGMENTS
- void *map_pointer;
- if(mlibc::sys_vm_map(reinterpret_cast<void *>(map_address),
- backed_map_size, prot | PROT_WRITE,
- MAP_PRIVATE | MAP_FIXED, fd, phdr->p_offset - misalign, &map_pointer))
- __ensure(!"sys_vm_map failed");
- if(total_map_size > backed_map_size)
- if(mlibc::sys_vm_map(reinterpret_cast<void *>(map_address + backed_map_size),
- total_map_size - backed_map_size, prot | PROT_WRITE,
- MAP_PRIVATE | MAP_FIXED | MAP_ANONYMOUS, -1, 0, &map_pointer))
- __ensure(!"sys_vm_map failed");
-
- if(mlibc::sys_vm_readahead)
- if(mlibc::sys_vm_readahead(reinterpret_cast<void *>(map_address),
- backed_map_size))
- mlibc::infoLogger() << "mlibc: sys_vm_readahead() failed in ld.so"
- << frg::endlog;
-
- // Clear the trailing area at the end of the backed mapping.
- // We do not clear the leading area; programs are not supposed to access it.
- memset(reinterpret_cast<void *>(map_address + misalign + phdr->p_filesz),
- 0, phdr->p_memsz - phdr->p_filesz);
- #else
- (void)backed_map_size;
-
- void *map_pointer;
- if(mlibc::sys_vm_map(reinterpret_cast<void *>(map_address),
- total_map_size, prot | PROT_WRITE,
- MAP_PRIVATE | MAP_FIXED | MAP_ANONYMOUS, -1, 0, &map_pointer))
- __ensure(!"sys_vm_map failed");
-
- __ensure(trySeek(fd, phdr->p_offset));
- __ensure(tryReadExactly(fd, reinterpret_cast<char *>(map_address) + misalign,
- phdr->p_filesz));
- #endif
- // Take care of removing superfluous permissions.
- if(mlibc::sys_vm_protect && ((prot & PROT_WRITE) == 0))
- if(mlibc::sys_vm_protect(map_pointer, total_map_size, prot))
- mlibc::infoLogger() << "mlibc: sys_vm_protect() failed in ld.so" << frg::endlog;
- }else if(phdr->p_type == PT_TLS) {
- object->tlsSegmentSize = phdr->p_memsz;
- object->tlsAlignment = phdr->p_align;
- object->tlsImageSize = phdr->p_filesz;
- object->tlsImagePtr = (void *)(object->baseAddress + phdr->p_vaddr);
- }else if(phdr->p_type == PT_DYNAMIC) {
- object->dynamic = (elf_dyn *)(object->baseAddress + phdr->p_vaddr);
- }else if(phdr->p_type == PT_INTERP
- || phdr->p_type == PT_PHDR
- || phdr->p_type == PT_NOTE
- || phdr->p_type == PT_RISCV_ATTRIBUTES
- || phdr->p_type == PT_GNU_EH_FRAME
- || phdr->p_type == PT_GNU_RELRO
- || phdr->p_type == PT_GNU_STACK
- || phdr->p_type == PT_GNU_PROPERTY) {
- // ignore the phdr
- }else{
- mlibc::panicLogger() << "Unexpected PHDR type 0x"
- << frg::hex_fmt(phdr->p_type) << " in DSO " << object->name << frg::endlog;
- }
- }
-
- return frg::success;
-}
-
-// --------------------------------------------------------
-// ObjectRepository: Parsing methods.
-// --------------------------------------------------------
-
-void ObjectRepository::_parseDynamic(SharedObject *object) {
- if(!object->dynamic)
- mlibc::infoLogger() << "ldso: Object '" << object->name
- << "' does not have a dynamic section" << frg::endlog;
- __ensure(object->dynamic);
-
- // Fix up these offsets to addresses after the loop, since the
- // addresses depend on the value of DT_STRTAB.
- frg::optional<ptrdiff_t> runpath_offset;
- /* If true, ignore the RPATH. */
- bool runpath_found = false;
- frg::optional<ptrdiff_t> soname_offset;
-
- for(size_t i = 0; object->dynamic[i].d_tag != DT_NULL; i++) {
- elf_dyn *dynamic = &object->dynamic[i];
- switch(dynamic->d_tag) {
- // handle hash table, symbol table and string table
- case DT_HASH:
- object->hashStyle = HashStyle::systemV;
- object->hashTableOffset = dynamic->d_un.d_ptr;
- break;
- case DT_GNU_HASH:
- object->hashStyle = HashStyle::gnu;
- object->hashTableOffset = dynamic->d_un.d_ptr;
- break;
- case DT_STRTAB:
- object->stringTableOffset = dynamic->d_un.d_ptr;
- break;
- case DT_STRSZ:
- break; // we don't need the size of the string table
- case DT_SYMTAB:
- object->symbolTableOffset = dynamic->d_un.d_ptr;
- break;
- case DT_SYMENT:
- __ensure(dynamic->d_un.d_val == sizeof(elf_sym));
- break;
- // handle lazy relocation table
- case DT_PLTGOT:
- object->globalOffsetTable = (void **)(object->baseAddress
- + dynamic->d_un.d_ptr);
- break;
- case DT_JMPREL:
- object->lazyRelocTableOffset = dynamic->d_un.d_ptr;
- break;
- case DT_PLTRELSZ:
- object->lazyTableSize = dynamic->d_un.d_val;
- break;
- case DT_PLTREL:
- if(dynamic->d_un.d_val == DT_RELA) {
- object->lazyExplicitAddend = true;
- }else{
- __ensure(dynamic->d_un.d_val == DT_REL);
- object->lazyExplicitAddend = false;
- }
- break;
- // TODO: Implement this correctly!
- case DT_SYMBOLIC:
- object->symbolicResolution = true;
- break;
- case DT_BIND_NOW:
- object->eagerBinding = true;
- break;
- case DT_FLAGS: {
- if(dynamic->d_un.d_val & DF_SYMBOLIC)
- object->symbolicResolution = true;
- if(dynamic->d_un.d_val & DF_STATIC_TLS)
- object->haveStaticTls = true;
- if(dynamic->d_un.d_val & DF_BIND_NOW)
- object->eagerBinding = true;
-
- auto ignored = DF_BIND_NOW | DF_SYMBOLIC | DF_STATIC_TLS;
-#ifdef __riscv
- // Work around https://sourceware.org/bugzilla/show_bug.cgi?id=24673.
- ignored |= DF_TEXTREL;
-#else
- if(dynamic->d_un.d_val & DF_TEXTREL)
- mlibc::panicLogger() << "\e[31mrtdl: DF_TEXTREL is unimplemented" << frg::endlog;
-#endif
- if(dynamic->d_un.d_val & ~ignored)
- mlibc::infoLogger() << "\e[31mrtdl: DT_FLAGS(" << frg::hex_fmt{dynamic->d_un.d_val & ~ignored}
- << ") is not implemented correctly!\e[39m"
- << frg::endlog;
- } break;
- case DT_FLAGS_1:
- if(dynamic->d_un.d_val & DF_1_NOW)
- object->eagerBinding = true;
- // The DF_1_PIE flag is informational only. It is used by e.g file(1).
- // The DF_1_NODELETE flag has a similar effect to RTLD_NODELETE, both of which we
- // ignore because we don't implement dlclose().
- if(dynamic->d_un.d_val & ~(DF_1_NOW | DF_1_PIE | DF_1_NODELETE))
- mlibc::infoLogger() << "\e[31mrtdl: DT_FLAGS_1(" << frg::hex_fmt{dynamic->d_un.d_val}
- << ") is not implemented correctly!\e[39m"
- << frg::endlog;
- break;
- case DT_RPATH:
- if (runpath_found) {
- /* Ignore RPATH if RUNPATH was present. */
- break;
- }
- [[fallthrough]];
- case DT_RUNPATH:
- runpath_found = dynamic->d_tag == DT_RUNPATH;
- runpath_offset = dynamic->d_un.d_val;
- break;
- case DT_INIT:
- if(dynamic->d_un.d_ptr != 0)
- object->initPtr = (InitFuncPtr)(object->baseAddress + dynamic->d_un.d_ptr);
- break;
- case DT_INIT_ARRAY:
- if(dynamic->d_un.d_ptr != 0)
- object->initArray = (InitFuncPtr *)(object->baseAddress + dynamic->d_un.d_ptr);
- break;
- case DT_INIT_ARRAYSZ:
- object->initArraySize = dynamic->d_un.d_val;
- break;
- case DT_PREINIT_ARRAY:
- if(dynamic->d_un.d_ptr != 0) {
- // Only the main object is allowed pre-initializers.
- __ensure(object->isMainObject);
- object->preInitArray = (InitFuncPtr *)(object->baseAddress + dynamic->d_un.d_ptr);
- }
- break;
- case DT_PREINIT_ARRAYSZ:
- // Only the main object is allowed pre-initializers.
- __ensure(object->isMainObject);
- object->preInitArraySize = dynamic->d_un.d_val;
- break;
- case DT_DEBUG:
-#if ELF_CLASS == ELFCLASS32
- dynamic->d_un.d_val = reinterpret_cast<Elf32_Word>(&globalDebugInterface);
-#elif ELF_CLASS == ELFCLASS64
- dynamic->d_un.d_val = reinterpret_cast<Elf64_Xword>(&globalDebugInterface);
-#endif
- break;
- case DT_SONAME:
- soname_offset = dynamic->d_un.d_val;
- break;
- // ignore unimportant tags
- case DT_NEEDED: // we handle this later
- case DT_FINI: case DT_FINI_ARRAY: case DT_FINI_ARRAYSZ:
- case DT_RELA: case DT_RELASZ: case DT_RELAENT: case DT_RELACOUNT:
- case DT_REL: case DT_RELSZ: case DT_RELENT: case DT_RELCOUNT:
- case DT_RELR: case DT_RELRSZ: case DT_RELRENT:
- case DT_VERSYM:
- case DT_VERDEF: case DT_VERDEFNUM:
- case DT_VERNEED: case DT_VERNEEDNUM:
-#ifdef __riscv
- case DT_TEXTREL: // Work around https://sourceware.org/bugzilla/show_bug.cgi?id=24673.
-#endif
- break;
- case DT_TLSDESC_PLT: case DT_TLSDESC_GOT:
- break;
- default:
- // Ignore unknown entries in the os-specific area as we don't use them.
- if(dynamic->d_tag < DT_LOOS || dynamic->d_tag > DT_HIOS) {
- mlibc::panicLogger() << "Unexpected dynamic entry "
- << (void *)dynamic->d_tag << " in object" << frg::endlog;
- }
- }
- }
-
- if(runpath_offset) {
- object->runPath = reinterpret_cast<const char *>(object->baseAddress
- + object->stringTableOffset + *runpath_offset);
- }
- if(soname_offset) {
- object->soName = reinterpret_cast<const char *>(object->baseAddress
- + object->stringTableOffset + *soname_offset);
- }
-}
-
-void ObjectRepository::_discoverDependencies(SharedObject *object,
- Scope *localScope, uint64_t rts) {
- if(object->isMainObject) {
- for(auto preload : *preloads) {
- frg::expected<LinkerError, SharedObject *> libraryResult;
- if (preload.find_first('/') == size_t(-1)) {
- libraryResult = requestObjectWithName(preload, object, globalScope.get(), false, 1);
- } else {
- libraryResult = requestObjectAtPath(preload, globalScope.get(), false, 1);
- }
- if(!libraryResult)
- mlibc::panicLogger() << "rtdl: Could not load preload " << preload << frg::endlog;
-
- if(verbose)
- mlibc::infoLogger() << "rtdl: Preloading " << preload << frg::endlog;
-
- object->dependencies.push_back(libraryResult.value());
- }
- }
-
- // Load required dynamic libraries.
- for(size_t i = 0; object->dynamic[i].d_tag != DT_NULL; i++) {
- elf_dyn *dynamic = &object->dynamic[i];
- if(dynamic->d_tag != DT_NEEDED)
- continue;
-
- const char *library_str = (const char *)(object->baseAddress
- + object->stringTableOffset + dynamic->d_un.d_val);
-
- auto library = requestObjectWithName(frg::string_view{library_str},
- object, localScope, false, rts);
- if(!library)
- mlibc::panicLogger() << "Could not satisfy dependency " << library_str << frg::endlog;
- object->dependencies.push(library.value());
- }
-}
-
-void ObjectRepository::_addLoadedObject(SharedObject *object) {
- _nameMap.insert(object->name, object);
- loadedObjects.push_back(object);
-}
-
-// --------------------------------------------------------
-// SharedObject
-// --------------------------------------------------------
-
-SharedObject::SharedObject(const char *name, frg::string<MemoryAllocator> path,
- bool is_main_object, Scope *local_scope, uint64_t object_rts)
- : name(name, getAllocator()), path(std::move(path)),
- interpreterPath(getAllocator()), soName(nullptr),
- isMainObject(is_main_object), objectRts(object_rts), inLinkMap(false),
- baseAddress(0), localScope(local_scope), dynamic(nullptr),
- globalOffsetTable(nullptr), entry(nullptr), tlsSegmentSize(0),
- tlsAlignment(0), tlsImageSize(0), tlsImagePtr(nullptr),
- tlsInitialized(false), hashTableOffset(0), symbolTableOffset(0),
- stringTableOffset(0), lazyRelocTableOffset(0), lazyTableSize(0),
- lazyExplicitAddend(false), symbolicResolution(false),
- eagerBinding(false), haveStaticTls(false),
- dependencies(getAllocator()), tlsModel(TlsModel::null),
- tlsOffset(0), globalRts(0), wasLinked(false),
- scheduledForInit(false), onInitStack(false),
- wasInitialized(false) { }
-
-SharedObject::SharedObject(const char *name, const char *path,
- bool is_main_object, Scope *localScope, uint64_t object_rts)
- : SharedObject(name,
- frg::string<MemoryAllocator> { path, getAllocator() },
- is_main_object, localScope, object_rts) {}
-
-void processLateRelocation(Relocation rel) {
- // resolve the symbol if there is a symbol
- frg::optional<ObjectSymbol> p;
- if(rel.symbol_index()) {
- auto symbol = (elf_sym *)(rel.object()->baseAddress + rel.object()->symbolTableOffset
- + rel.symbol_index() * sizeof(elf_sym));
- ObjectSymbol r(rel.object(), symbol);
-
- p = Scope::resolveGlobalOrLocal(*globalScope, rel.object()->localScope,
- r.getString(), rel.object()->objectRts, Scope::resolveCopy);
- }
-
- switch(rel.type()) {
- case R_COPY:
- __ensure(p);
- memcpy(rel.destination(), (void *)p->virtualAddress(), p->symbol()->st_size);
- break;
-
-// TODO: R_IRELATIVE also exists on other architectures but will likely need a different implementation.
-#if defined(__x86_64__) || defined(__i386__)
- case R_IRELATIVE: {
- uintptr_t addr = rel.object()->baseAddress + rel.addend_rel();
- auto* fn = reinterpret_cast<uintptr_t (*)()>(addr);
- rel.relocate(fn());
- } break;
-#elif defined(__aarch64__)
- case R_IRELATIVE: {
- uintptr_t addr = rel.object()->baseAddress + rel.addend_rel();
- auto* fn = reinterpret_cast<uintptr_t (*)(uint64_t)>(addr);
- // TODO: the function should get passed AT_HWCAP value.
- rel.relocate(fn(0));
- } break;
-#endif
-
- default:
- break;
- }
-}
-
-void processLateRelocations(SharedObject *object) {
- frg::optional<uintptr_t> rel_offset;
- frg::optional<size_t> rel_length;
-
- frg::optional<uintptr_t> rela_offset;
- frg::optional<size_t> rela_length;
-
- for(size_t i = 0; object->dynamic[i].d_tag != DT_NULL; i++) {
- elf_dyn *dynamic = &object->dynamic[i];
-
- switch(dynamic->d_tag) {
- case DT_REL:
- rel_offset = dynamic->d_un.d_ptr;
- break;
- case DT_RELSZ:
- rel_length = dynamic->d_un.d_val;
- break;
- case DT_RELENT:
- __ensure(dynamic->d_un.d_val == sizeof(elf_rel));
- break;
- case DT_RELA:
- rela_offset = dynamic->d_un.d_ptr;
- break;
- case DT_RELASZ:
- rela_length = dynamic->d_un.d_val;
- break;
- case DT_RELAENT:
- __ensure(dynamic->d_un.d_val == sizeof(elf_rela));
- break;
- }
- }
-
- if(rela_offset && rela_length) {
- for(size_t offset = 0; offset < *rela_length; offset += sizeof(elf_rela)) {
- auto reloc = (elf_rela *)(object->baseAddress + *rela_offset + offset);
- auto r = Relocation(object, reloc);
- processLateRelocation(r);
- }
- } else if(rel_offset && rel_length) {
- for(size_t offset = 0; offset < *rel_length; offset += sizeof(elf_rel)) {
- auto reloc = (elf_rel *)(object->baseAddress + *rel_offset + offset);
- auto r = Relocation(object, reloc);
- processLateRelocation(r);
- }
- }else{
- __ensure(!rela_offset && !rela_length);
- __ensure(!rel_offset && !rel_length);
- }
-}
-
-void doInitialize(SharedObject *object) {
- __ensure(object->wasLinked);
- __ensure(!object->wasInitialized);
-
- // if the object has dependencies we initialize them first
- for(size_t i = 0; i < object->dependencies.size(); i++)
- __ensure(object->dependencies[i]->wasInitialized);
-
- if(verbose)
- mlibc::infoLogger() << "rtdl: Initialize " << object->name << frg::endlog;
-
- if(verbose)
- mlibc::infoLogger() << "rtdl: Running DT_INIT function" << frg::endlog;
- if(object->initPtr != nullptr)
- object->initPtr();
-
- if(verbose)
- mlibc::infoLogger() << "rtdl: Running DT_INIT_ARRAY functions" << frg::endlog;
- __ensure((object->initArraySize % sizeof(InitFuncPtr)) == 0);
- for(size_t i = 0; i < object->initArraySize / sizeof(InitFuncPtr); i++)
- object->initArray[i]();
-
- if(verbose)
- mlibc::infoLogger() << "rtdl: Object initialization complete" << frg::endlog;
- object->wasInitialized = true;
-}
-
-// --------------------------------------------------------
-// RuntimeTlsMap
-// --------------------------------------------------------
-
-RuntimeTlsMap::RuntimeTlsMap()
-: initialPtr{0}, initialLimit{0}, indices{getAllocator()} { }
-
-void initTlsObjects(Tcb *tcb, const frg::vector<SharedObject *, MemoryAllocator> &objects, bool checkInitialized) {
- // Initialize TLS segments that follow the static model.
- for(auto object : objects) {
- if(object->tlsModel == TlsModel::initial) {
- if(checkInitialized && object->tlsInitialized)
- continue;
-
- char *tcb_ptr = reinterpret_cast<char *>(tcb);
- auto tls_ptr = tcb_ptr + object->tlsOffset;
- memset(tls_ptr, 0, object->tlsSegmentSize);
- memcpy(tls_ptr, object->tlsImagePtr, object->tlsImageSize);
-
- if (verbose) {
- mlibc::infoLogger() << "rtdl: wrote tls image at " << (void *)tls_ptr
- << ", size = 0x" << frg::hex_fmt{object->tlsSegmentSize} << frg::endlog;
- }
-
- if (checkInitialized)
- object->tlsInitialized = true;
- }
- }
-}
-
-Tcb *allocateTcb() {
- size_t tlsInitialSize = runtimeTlsMap->initialLimit;
-
- // To make sure that both the TCB and TLS data are sufficiently aligned, allocate
- // slightly more than necessary and adjust alignment afterwards.
- size_t alignOverhead = frg::max(alignof(Tcb), tlsMaxAlignment);
- size_t allocSize = tlsInitialSize + sizeof(Tcb) + alignOverhead;
- auto allocation = reinterpret_cast<uintptr_t>(getAllocator().allocate(allocSize));
- memset(reinterpret_cast<void *>(allocation), 0, allocSize);
-
- uintptr_t tlsAddress, tcbAddress;
- if constexpr (tlsAboveTp) {
- // Here we must satisfy two requirements of the TCB and the TLS data:
- // 1. One should follow the other immediately in memory. We do this so that
- // we can simply add or subtract sizeof(Tcb) to obtain the address of the other.
- // 2. Both should be sufficiently aligned.
- // To do this, we will fix whichever address has stricter alignment requirements, and
- // derive the other from it.
- if (tlsMaxAlignment > alignof(Tcb)) {
- tlsAddress = alignUp(allocation + sizeof(Tcb), tlsMaxAlignment);
- tcbAddress = tlsAddress - sizeof(Tcb);
- } else {
- tcbAddress = alignUp(allocation, alignof(Tcb));
- tlsAddress = tcbAddress + sizeof(Tcb);
- }
- __ensure((tlsAddress & (tlsMaxAlignment - 1)) == 0);
- __ensure(tlsAddress == tcbAddress + sizeof(Tcb));
- } else {
- // The TCB should be aligned such that the preceding blocks are aligned too.
- tcbAddress = alignUp(allocation + tlsInitialSize, alignOverhead);
- tlsAddress = tcbAddress - tlsInitialSize;
- }
- __ensure((tcbAddress & (alignof(Tcb) - 1)) == 0);
-
- if (verbose) {
- mlibc::infoLogger() << "rtdl: tcb allocated at " << (void *)tcbAddress
- << ", size = 0x" << frg::hex_fmt{sizeof(Tcb)} << frg::endlog;
- mlibc::infoLogger() << "rtdl: tls allocated at " << (void *)tlsAddress
- << ", size = 0x" << frg::hex_fmt{tlsInitialSize} << frg::endlog;
- }
-
- Tcb *tcb_ptr = new ((char *)tcbAddress) Tcb;
- tcb_ptr->selfPointer = tcb_ptr;
-
- tcb_ptr->stackCanary = __stack_chk_guard;
- tcb_ptr->cancelBits = tcbCancelEnableBit;
- tcb_ptr->didExit = 0;
- tcb_ptr->isJoinable = 1;
- memset(&tcb_ptr->returnValue, 0, sizeof(tcb_ptr->returnValue));
- tcb_ptr->localKeys = frg::construct<frg::array<Tcb::LocalKey, PTHREAD_KEYS_MAX>>(getAllocator());
- tcb_ptr->dtvSize = runtimeTlsMap->indices.size();
- tcb_ptr->dtvPointers = frg::construct_n<void *>(getAllocator(), runtimeTlsMap->indices.size());
- memset(tcb_ptr->dtvPointers, 0, sizeof(void *) * runtimeTlsMap->indices.size());
- for(size_t i = 0; i < runtimeTlsMap->indices.size(); ++i) {
- auto object = runtimeTlsMap->indices[i];
- if(object->tlsModel != TlsModel::initial)
- continue;
- tcb_ptr->dtvPointers[i] = reinterpret_cast<char *>(tcb_ptr) + object->tlsOffset;
- }
-
- return tcb_ptr;
-}
-
-void *accessDtv(SharedObject *object) {
- Tcb *tcb_ptr = mlibc::get_current_tcb();
-
- // We might need to reallocate the DTV.
- if(object->tlsIndex >= tcb_ptr->dtvSize) {
- // TODO: need to protect runtimeTlsMap against concurrent access.
- auto ndtv = frg::construct_n<void *>(getAllocator(), runtimeTlsMap->indices.size());
- memset(ndtv, 0, sizeof(void *) * runtimeTlsMap->indices.size());
- memcpy(ndtv, tcb_ptr->dtvPointers, sizeof(void *) * tcb_ptr->dtvSize);
- frg::destruct_n(getAllocator(), tcb_ptr->dtvPointers, tcb_ptr->dtvSize);
- tcb_ptr->dtvSize = runtimeTlsMap->indices.size();
- tcb_ptr->dtvPointers = ndtv;
- }
-
- // We might need to fill in a new DTV entry.
- if(!tcb_ptr->dtvPointers[object->tlsIndex]) {
- __ensure(object->tlsModel == TlsModel::dynamic);
-
- auto buffer = getAllocator().allocate(object->tlsSegmentSize);
- __ensure(!(reinterpret_cast<uintptr_t>(buffer) & (object->tlsAlignment - 1)));
- memset(buffer, 0, object->tlsSegmentSize);
- memcpy(buffer, object->tlsImagePtr, object->tlsImageSize);
- tcb_ptr->dtvPointers[object->tlsIndex] = buffer;
-
- if (verbose) {
- mlibc::infoLogger() << "rtdl: accessDtv wrote tls image at " << buffer
- << ", size = 0x" << frg::hex_fmt{object->tlsSegmentSize} << frg::endlog;
- }
- }
-
- return (void *)((char *)tcb_ptr->dtvPointers[object->tlsIndex] + TLS_DTV_OFFSET);
-}
-
-void *tryAccessDtv(SharedObject *object) {
- Tcb *tcb_ptr = mlibc::get_current_tcb();
-
- if (object->tlsIndex >= tcb_ptr->dtvSize)
- return nullptr;
- if (!tcb_ptr->dtvPointers[object->tlsIndex])
- return nullptr;
-
- return (void *)((char *)tcb_ptr->dtvPointers[object->tlsIndex] + TLS_DTV_OFFSET);
-}
-
-// --------------------------------------------------------
-// ObjectSymbol
-// --------------------------------------------------------
-
-ObjectSymbol::ObjectSymbol(SharedObject *object, const elf_sym *symbol)
-: _object(object), _symbol(symbol) { }
-
-const char *ObjectSymbol::getString() {
- __ensure(_symbol->st_name != 0);
- return (const char *)(_object->baseAddress
- + _object->stringTableOffset + _symbol->st_name);
-}
-
-uintptr_t ObjectSymbol::virtualAddress() {
- auto bind = ELF_ST_BIND(_symbol->st_info);
- __ensure(bind == STB_GLOBAL || bind == STB_WEAK || bind == STB_GNU_UNIQUE);
- __ensure(_symbol->st_shndx != SHN_UNDEF);
- return _object->baseAddress + _symbol->st_value;
-}
-
-// --------------------------------------------------------
-// Scope
-// --------------------------------------------------------
-
-uint32_t elf64Hash(frg::string_view string) {
- uint32_t h = 0, g;
-
- for(size_t i = 0; i < string.size(); ++i) {
- h = (h << 4) + (uint32_t)string[i];
- g = h & 0xF0000000;
- if(g)
- h ^= g >> 24;
- h &= 0x0FFFFFFF;
- }
-
- return h;
-}
-
-uint32_t gnuHash(frg::string_view string) {
- uint32_t h = 5381;
- for(size_t i = 0; i < string.size(); ++i)
- h = (h << 5) + h + string[i];
- return h;
-}
-
-// TODO: move this to some namespace or class?
-frg::optional<ObjectSymbol> resolveInObject(SharedObject *object, frg::string_view string) {
- // Checks if the symbol can be used to satisfy the dependency.
- auto eligible = [&] (ObjectSymbol cand) {
- if(cand.symbol()->st_shndx == SHN_UNDEF)
- return false;
-
- auto bind = ELF_ST_BIND(cand.symbol()->st_info);
- if(bind != STB_GLOBAL && bind != STB_WEAK && bind != STB_GNU_UNIQUE)
- return false;
-
- return true;
- };
-
- if (object->hashStyle == HashStyle::systemV) {
- auto hash_table = (Elf64_Word *)(object->baseAddress + object->hashTableOffset);
- Elf64_Word num_buckets = hash_table[0];
- auto bucket = elf64Hash(string) % num_buckets;
-
- auto index = hash_table[2 + bucket];
- while(index != 0) {
- ObjectSymbol cand{object, (elf_sym *)(object->baseAddress
- + object->symbolTableOffset + index * sizeof(elf_sym))};
- if(eligible(cand) && frg::string_view{cand.getString()} == string)
- return cand;
-
- index = hash_table[2 + num_buckets + index];
- }
-
- return frg::optional<ObjectSymbol>{};
- }else{
- __ensure(object->hashStyle == HashStyle::gnu);
-
- struct GnuTable {
- uint32_t nBuckets;
- uint32_t symbolOffset;
- uint32_t bloomSize;
- uint32_t bloomShift;
- };
-
- auto hash_table = reinterpret_cast<const GnuTable *>(object->baseAddress
- + object->hashTableOffset);
- auto buckets = reinterpret_cast<const uint32_t *>(object->baseAddress
- + object->hashTableOffset + sizeof(GnuTable)
- + hash_table->bloomSize * sizeof(elf_addr));
- auto chains = reinterpret_cast<const uint32_t *>(object->baseAddress
- + object->hashTableOffset + sizeof(GnuTable)
- + hash_table->bloomSize * sizeof(elf_addr)
- + hash_table->nBuckets * sizeof(uint32_t));
-
- // TODO: Use the bloom filter.
-
- // The symbols of a given bucket are contiguous in the table.
- auto hash = gnuHash(string);
- auto index = buckets[hash % hash_table->nBuckets];
-
- if(!index)
- return frg::optional<ObjectSymbol>{};
-
- while(true) {
- // chains[] contains an array of hashes, parallel to the symbol table.
- auto chash = chains[index - hash_table->symbolOffset];
- if ((chash & ~1) == (hash & ~1)) {
- ObjectSymbol cand{object, (elf_sym *)(object->baseAddress
- + object->symbolTableOffset + index * sizeof(elf_sym))};
- if(eligible(cand) && frg::string_view{cand.getString()} == string)
- return cand;
- }
-
- // If we hit the end of the chain, the symbol is not present.
- if(chash & 1)
- return frg::optional<ObjectSymbol>{};
- index++;
- }
- }
-}
-
-frg::optional<ObjectSymbol> Scope::_resolveNext(frg::string_view string,
- SharedObject *target) {
- // Skip objects until we find the target, and only look for symbols after that.
- size_t i;
- for (i = 0; i < _objects.size(); i++) {
- if (_objects[i] == target)
- break;
- }
-
- if (i == _objects.size()) {
- mlibc::infoLogger() << "rtdl: object passed to Scope::resolveAfter was not found" << frg::endlog;
- return frg::optional<ObjectSymbol>();
- }
-
- for (i = i + 1; i < _objects.size(); i++) {
- if(_objects[i]->isMainObject)
- continue;
-
- frg::optional<ObjectSymbol> p = resolveInObject(_objects[i], string);
- if(p)
- return p;
- }
-
- return frg::optional<ObjectSymbol>();
-}
-
-Scope::Scope(bool isGlobal)
-: isGlobal{isGlobal}, _objects(getAllocator()) { }
-
-void Scope::appendObject(SharedObject *object) {
- // Don't insert duplicates.
- for (auto obj : _objects) {
- if (obj == object)
- return;
- }
-
- _objects.push(object);
-}
-
-frg::optional<ObjectSymbol> Scope::resolveGlobalOrLocal(Scope &globalScope,
- Scope *localScope, frg::string_view string, uint64_t skipRts, ResolveFlags flags) {
- auto sym = globalScope.resolveSymbol(string, skipRts, flags | skipGlobalAfterRts);
- if(!sym && localScope)
- sym = localScope->resolveSymbol(string, skipRts, flags | skipGlobalAfterRts);
- return sym;
-}
-
-frg::optional<ObjectSymbol> Scope::resolveGlobalOrLocalNext(Scope &globalScope,
- Scope *localScope, frg::string_view string, SharedObject *origin) {
- auto sym = globalScope._resolveNext(string, origin);
- if(!sym && localScope) {
- sym = localScope->_resolveNext(string, origin);
- }
- return sym;
-}
-
-// TODO: let this return uintptr_t
-frg::optional<ObjectSymbol> Scope::resolveSymbol(frg::string_view string,
- uint64_t skipRts, ResolveFlags flags) {
- for (auto object : _objects) {
- if((flags & resolveCopy) && object->isMainObject)
- continue;
- if((flags & skipGlobalAfterRts) && object->globalRts > skipRts) {
- // globalRts should be monotone increasing for objects in the global scope,
- // so as an optimization we can break early here.
- // TODO: If we implement DT_SYMBOLIC, this assumption fails.
- if(isGlobal)
- break;
- else
- continue;
- }
-
- frg::optional<ObjectSymbol> p = resolveInObject(object, string);
- if(p)
- return p;
- }
-
- return frg::optional<ObjectSymbol>();
-}
-
-// --------------------------------------------------------
-// Loader
-// --------------------------------------------------------
-
-Loader::Loader(Scope *scope, SharedObject *mainExecutable, bool is_initial_link, uint64_t rts)
-: _mainExecutable{mainExecutable}, _loadScope{scope}, _isInitialLink{is_initial_link},
- _linkRts{rts}, _linkBfs{getAllocator()}, _initQueue{getAllocator()} { }
-
-void Loader::_buildLinkBfs(SharedObject *root) {
- __ensure(_linkBfs.size() == 0);
-
- struct Token {};
- using Set = frg::hash_map<SharedObject *, Token,
- frg::hash<SharedObject *>, MemoryAllocator>;
- Set set{frg::hash<SharedObject *>{}, getAllocator()};
- _linkBfs.push(root);
-
- // Loop over indices (not iterators) here: We are adding elements in the loop!
- for(size_t i = 0; i < _linkBfs.size(); i++) {
- auto current = _linkBfs[i];
-
- // At this point the object is loaded and we can fill in its debug struct,
- // the linked list fields will be filled later.
- current->linkMap.base = current->baseAddress;
- current->linkMap.name = current->path.data();
- current->linkMap.dynv = current->dynamic;
-
- __ensure((current->tlsAlignment & (current->tlsAlignment - 1)) == 0);
-
- if (_isInitialLink && current->tlsAlignment > tlsMaxAlignment) {
- tlsMaxAlignment = current->tlsAlignment;
- }
-
- for (auto dep : current->dependencies) {
- if (!set.get(dep)) {
- set.insert(dep, Token{});
- _linkBfs.push(dep);
- }
- }
- }
-}
-
-void Loader::linkObjects(SharedObject *root) {
- _buildLinkBfs(root);
- _buildTlsMaps();
-
- // Promote objects to the desired scope.
- for(auto object : _linkBfs) {
- if (object->globalRts == 0 && _loadScope->isGlobal)
- object->globalRts = _linkRts;
-
- _loadScope->appendObject(object);
- }
-
- // Process regular relocations.
- for(auto object : _linkBfs) {
- // Some objects have already been linked before.
- if(object->objectRts < _linkRts)
- continue;
-
- if(object->dynamic == nullptr)
- continue;
-
- if(verbose)
- mlibc::infoLogger() << "rtdl: Linking " << object->name << frg::endlog;
-
- __ensure(!object->wasLinked);
-
- // TODO: Support this.
- if(object->symbolicResolution)
- mlibc::infoLogger() << "\e[31mrtdl: DT_SYMBOLIC is not implemented correctly!\e[39m"
- << frg::endlog;
-
- _processStaticRelocations(object);
- _processLazyRelocations(object);
- }
-
- // Process copy relocations.
- for(auto object : _linkBfs) {
- if(!object->isMainObject)
- continue;
-
- // Some objects have already been linked before.
- if(object->objectRts < _linkRts)
- continue;
-
- if(object->dynamic == nullptr)
- continue;
-
- processLateRelocations(object);
- }
-
- for(auto object : _linkBfs) {
- object->wasLinked = true;
-
- if(object->inLinkMap)
- continue;
-
- auto linkMap = reinterpret_cast<LinkMap*>(globalDebugInterface.head);
-
- object->linkMap.prev = linkMap;
- object->linkMap.next = linkMap->next;
- if(linkMap->next)
- linkMap->next->prev = &(object->linkMap);
- linkMap->next = &(object->linkMap);
- object->inLinkMap = true;
- }
-}
-
-void Loader::_buildTlsMaps() {
- if(_isInitialLink) {
- __ensure(runtimeTlsMap->initialPtr == 0);
- __ensure(runtimeTlsMap->initialLimit == 0);
-
- __ensure(!_linkBfs.empty());
- __ensure(_linkBfs.front()->isMainObject);
-
- for(auto object : _linkBfs) {
- __ensure(object->tlsModel == TlsModel::null);
-
- if(object->tlsSegmentSize == 0)
- continue;
-
- // Allocate an index for the object.
- object->tlsIndex = runtimeTlsMap->indices.size();
- runtimeTlsMap->indices.push_back(object);
-
- object->tlsModel = TlsModel::initial;
-
- if constexpr (tlsAboveTp) {
- // As per the comment in allocateTcb(), we may simply add sizeof(Tcb) to
- // reach the TLS data.
- object->tlsOffset = runtimeTlsMap->initialPtr + sizeof(Tcb);
- runtimeTlsMap->initialPtr += object->tlsSegmentSize;
-
- size_t misalign = runtimeTlsMap->initialPtr & (object->tlsAlignment - 1);
- if(misalign)
- runtimeTlsMap->initialPtr += object->tlsAlignment - misalign;
- } else {
- runtimeTlsMap->initialPtr += object->tlsSegmentSize;
-
- size_t misalign = runtimeTlsMap->initialPtr & (object->tlsAlignment - 1);
- if(misalign)
- runtimeTlsMap->initialPtr += object->tlsAlignment - misalign;
-
- object->tlsOffset = -runtimeTlsMap->initialPtr;
- }
-
- if(verbose)
- mlibc::infoLogger() << "rtdl: TLS of " << object->name
- << " mapped to 0x" << frg::hex_fmt{object->tlsOffset}
- << ", size: " << object->tlsSegmentSize
- << ", alignment: " << object->tlsAlignment << frg::endlog;
- }
-
- // Reserve some additional space for future libraries.
- runtimeTlsMap->initialLimit = runtimeTlsMap->initialPtr + 64;
- }else{
- for(auto object : _linkBfs) {
- if(object->tlsModel != TlsModel::null)
- continue;
- if(object->tlsSegmentSize == 0)
- continue;
-
- // Allocate an index for the object.
- object->tlsIndex = runtimeTlsMap->indices.size();
- runtimeTlsMap->indices.push_back(object);
-
- // There are some libraries (e.g. Mesa) that require static TLS even though
- // they expect to be dynamically loaded.
- if(object->haveStaticTls) {
- auto ptr = runtimeTlsMap->initialPtr + object->tlsSegmentSize;
- size_t misalign = ptr & (object->tlsAlignment - 1);
- if(misalign)
- ptr += object->tlsAlignment - misalign;
-
- if(ptr > runtimeTlsMap->initialLimit)
- mlibc::panicLogger() << "rtdl: Static TLS space exhausted while while"
- " allocating TLS for " << object->name << frg::endlog;
-
- object->tlsModel = TlsModel::initial;
-
- if constexpr (tlsAboveTp) {
- size_t tcbSize = ((sizeof(Tcb) + tlsMaxAlignment - 1) & ~(tlsMaxAlignment - 1));
-
- object->tlsOffset = runtimeTlsMap->initialPtr + tcbSize;
- runtimeTlsMap->initialPtr = ptr;
- } else {
- runtimeTlsMap->initialPtr = ptr;
- object->tlsOffset = -runtimeTlsMap->initialPtr;
- }
-
- if(verbose)
- mlibc::infoLogger() << "rtdl: TLS of " << object->name
- << " mapped to 0x" << frg::hex_fmt{object->tlsOffset}
- << ", size: " << object->tlsSegmentSize
- << ", alignment: " << object->tlsAlignment << frg::endlog;
- }else{
- object->tlsModel = TlsModel::dynamic;
- }
- }
- }
-}
-
-void Loader::initObjects() {
- initTlsObjects(mlibc::get_current_tcb(), _linkBfs, true);
-
- if (_mainExecutable && _mainExecutable->preInitArray) {
- if (verbose)
- mlibc::infoLogger() << "rtdl: Running DT_PREINIT_ARRAY functions" << frg::endlog;
-
- __ensure(_mainExecutable->isMainObject);
- __ensure(!_mainExecutable->wasInitialized);
- __ensure((_mainExecutable->preInitArraySize % sizeof(InitFuncPtr)) == 0);
- for(size_t i = 0; i < _mainExecutable->preInitArraySize / sizeof(InitFuncPtr); i++)
- _mainExecutable->preInitArray[i]();
- }
-
- // Convert the breadth-first representation to a depth-first post-order representation,
- // so that every object is initialized *after* its dependencies.
- for(auto object : _linkBfs) {
- if(!object->scheduledForInit)
- _scheduleInit(object);
- }
-
- for(auto object : _initQueue) {
- if(!object->wasInitialized)
- doInitialize(object);
- }
-}
-
-// TODO: Use an explicit vector to reduce stack usage to O(1)?
-void Loader::_scheduleInit(SharedObject *object) {
- // Here we detect cyclic dependencies.
- __ensure(!object->onInitStack);
- object->onInitStack = true;
-
- __ensure(!object->scheduledForInit);
- object->scheduledForInit = true;
-
- for(size_t i = 0; i < object->dependencies.size(); i++) {
- if(!object->dependencies[i]->scheduledForInit)
- _scheduleInit(object->dependencies[i]);
- }
-
- _initQueue.push(object);
- object->onInitStack = false;
-}
-
-void Loader::_processRelocations(Relocation &rel) {
- // copy and irelative relocations have to be performed after all other relocations
- if(rel.type() == R_COPY || rel.type() == R_IRELATIVE)
- return;
-
- // resolve the symbol if there is a symbol
- frg::optional<ObjectSymbol> p;
- if(rel.symbol_index()) {
- auto symbol = (elf_sym *)(rel.object()->baseAddress + rel.object()->symbolTableOffset
- + rel.symbol_index() * sizeof(elf_sym));
- ObjectSymbol r(rel.object(), symbol);
-
- p = Scope::resolveGlobalOrLocal(*globalScope, rel.object()->localScope,
- r.getString(), rel.object()->objectRts, 0);
- if(!p) {
- if(ELF_ST_BIND(symbol->st_info) != STB_WEAK)
- mlibc::panicLogger() << "Unresolved load-time symbol "
- << r.getString() << " in object " << rel.object()->name << frg::endlog;
-
- if(verbose)
- mlibc::infoLogger() << "rtdl: Unresolved weak load-time symbol "
- << r.getString() << " in object " << rel.object()->name << frg::endlog;
- }
- }
-
- switch(rel.type()) {
- case R_NONE:
- break;
-
- case R_JUMP_SLOT: {
- __ensure(!rel.addend_norel());
- uintptr_t symbol_addr = p ? p->virtualAddress() : 0;
- rel.relocate(symbol_addr);
- } break;
-
-#if !defined(__riscv)
- // on some architectures, R_GLOB_DAT can be defined to other relocations
- case R_GLOB_DAT: {
- __ensure(rel.symbol_index());
- uintptr_t symbol_addr = p ? p->virtualAddress() : 0;
- rel.relocate(symbol_addr + rel.addend_norel());
- } break;
-#endif
-
- case R_ABSOLUTE: {
- __ensure(rel.symbol_index());
- uintptr_t symbol_addr = p ? p->virtualAddress() : 0;
- rel.relocate(symbol_addr + rel.addend_rel());
- } break;
-
- case R_RELATIVE: {
- __ensure(!rel.symbol_index());
- rel.relocate(rel.object()->baseAddress + rel.addend_rel());
- } break;
-
- // DTPMOD and DTPREL are dynamic TLS relocations (for __tls_get_addr()).
- // TPOFF is a relocation to the initial TLS model.
- case R_TLS_DTPMOD: {
- // sets the first `sizeof(uintptr_t)` bytes of `struct __abi_tls_entry`
- // this means that we can just use the `SharedObject *` to resolve whatever we need
- __ensure(!rel.addend_rel());
- if(rel.symbol_index()) {
- __ensure(p);
- rel.relocate(elf_addr(p->object()));
- }else{
- if(stillSlightlyVerbose)
- mlibc::infoLogger() << "rtdl: Warning: TLS_DTPMOD64 with no symbol in object "
- << rel.object()->name << frg::endlog;
- rel.relocate(elf_addr(rel.object()));
- }
- } break;
- case R_TLS_DTPREL: {
- __ensure(rel.symbol_index());
- __ensure(p);
- rel.relocate(p->symbol()->st_value + rel.addend_rel() - TLS_DTV_OFFSET);
- } break;
- case R_TLS_TPREL: {
- uintptr_t off = rel.addend_rel();
- uintptr_t tls_offset = 0;
-
- if(rel.symbol_index()) {
- __ensure(p);
- if(p->object()->tlsModel != TlsModel::initial)
- mlibc::panicLogger() << "rtdl: In object " << rel.object()->name
- << ": Static TLS relocation to symbol " << p->getString()
- << " in dynamically loaded object "
- << p->object()->name << frg::endlog;
- off += p->symbol()->st_value;
- tls_offset = p->object()->tlsOffset;
- }else{
- if(stillSlightlyVerbose)
- mlibc::infoLogger() << "rtdl: Warning: TPOFF64 with no symbol"
- " in object " << rel.object()->name << frg::endlog;
- if(rel.object()->tlsModel != TlsModel::initial)
- mlibc::panicLogger() << "rtdl: In object " << rel.object()->name
- << ": Static TLS relocation to dynamically loaded object "
- << rel.object()->name << frg::endlog;
- tls_offset = rel.object()->tlsOffset;
- }
-
- if constexpr (tlsAboveTp) {
- off += tls_offset - sizeof(Tcb);
- } else {
- off += tls_offset;
- }
-
- rel.relocate(off);
- } break;
- default:
- mlibc::panicLogger() << "Unexpected relocation type "
- << (void *) rel.type() << frg::endlog;
- }
-}
-
-void Loader::_processStaticRelocations(SharedObject *object) {
- frg::optional<uintptr_t> rela_offset;
- frg::optional<size_t> rela_length;
-
- frg::optional<uintptr_t> rel_offset;
- frg::optional<size_t> rel_length;
-
- frg::optional<uintptr_t> relr_offset;
- frg::optional<size_t> relr_length;
-
- for(size_t i = 0; object->dynamic[i].d_tag != DT_NULL; i++) {
- elf_dyn *dynamic = &object->dynamic[i];
-
- switch(dynamic->d_tag) {
- case DT_RELA:
- rela_offset = dynamic->d_un.d_ptr;
- break;
- case DT_RELASZ:
- rela_length = dynamic->d_un.d_val;
- break;
- case DT_RELAENT:
- __ensure(dynamic->d_un.d_val == sizeof(elf_rela));
- break;
- case DT_REL:
- rel_offset = dynamic->d_un.d_ptr;
- break;
- case DT_RELSZ:
- rel_length = dynamic->d_un.d_val;
- break;
- case DT_RELENT:
- __ensure(dynamic->d_un.d_val == sizeof(elf_rel));
- break;
- case DT_RELR:
- relr_offset = dynamic->d_un.d_ptr;
- break;
- case DT_RELRSZ:
- relr_length = dynamic->d_un.d_val;
- break;
- case DT_RELRENT:
- __ensure(dynamic->d_un.d_val == sizeof(elf_relr));
- break;
- }
- }
-
- if(rela_offset && rela_length) {
- __ensure(!rel_offset && !rel_length);
-
- for(size_t offset = 0; offset < *rela_length; offset += sizeof(elf_rela)) {
- auto reloc = (elf_rela *)(object->baseAddress + *rela_offset + offset);
- auto r = Relocation(object, reloc);
-
- _processRelocations(r);
- }
- }else if(rel_offset && rel_length) {
- __ensure(!rela_offset && !rela_length);
-
- for(size_t offset = 0; offset < *rel_length; offset += sizeof(elf_rel)) {
- auto reloc = (elf_rel *)(object->baseAddress + *rel_offset + offset);
- auto r = Relocation(object, reloc);
-
- _processRelocations(r);
- }
- }
-
- if(relr_offset && relr_length) {
- elf_addr *addr = nullptr;
-
- for(size_t offset = 0; offset < *relr_length; offset += sizeof(elf_relr)) {
- auto entry = *(elf_relr *)(object->baseAddress + *relr_offset + offset);
-
- // Even entry indicates the beginning address.
- if(!(entry & 1)) {
- addr = (elf_addr *)(object->baseAddress + entry);
- __ensure(addr);
- *addr++ += object->baseAddress;
- }else {
- // Odd entry indicates entry is a bitmap of the subsequent locations to be relocated.
- for(int i = 0; entry; ++i) {
- if(entry & 1) {
- addr[i] += object->baseAddress;
- }
- entry >>= 1;
- }
-
- // Each entry describes at max 63 (on 64bit) or 31 (on 32bit) subsequent locations.
- addr += CHAR_BIT * sizeof(elf_relr) - 1;
- }
- }
- }
-}
-
-// TODO: TLSDESC relocations aren't aarch64 specific
-#ifdef __aarch64__
-extern "C" void *__mlibcTlsdescStatic(void *);
-extern "C" void *__mlibcTlsdescDynamic(void *);
-#endif
-
-void Loader::_processLazyRelocations(SharedObject *object) {
- if(object->globalOffsetTable == nullptr) {
- __ensure(object->lazyRelocTableOffset == 0);
- return;
- }
- object->globalOffsetTable[1] = object;
- object->globalOffsetTable[2] = (void *)&pltRelocateStub;
-
- if(!object->lazyTableSize)
- return;
-
- // adjust the addresses of JUMP_SLOT relocations
- __ensure(object->lazyExplicitAddend.has_value());
- size_t rel_size = (*object->lazyExplicitAddend) ? sizeof(elf_rela) : sizeof(elf_rel);
-
- for(size_t offset = 0; offset < object->lazyTableSize; offset += rel_size) {
- elf_info type;
- elf_info symbol_index;
-
- uintptr_t rel_addr;
- uintptr_t addend [[maybe_unused]] = 0;
-
- if(*object->lazyExplicitAddend) {
- auto reloc = (elf_rela *)(object->baseAddress + object->lazyRelocTableOffset + offset);
- type = ELF_R_TYPE(reloc->r_info);
- symbol_index = ELF_R_SYM(reloc->r_info);
- rel_addr = object->baseAddress + reloc->r_offset;
- addend = reloc->r_addend;
- } else {
- auto reloc = (elf_rel *)(object->baseAddress + object->lazyRelocTableOffset + offset);
- type = ELF_R_TYPE(reloc->r_info);
- symbol_index = ELF_R_SYM(reloc->r_info);
- rel_addr = object->baseAddress + reloc->r_offset;
- }
-
- switch (type) {
- case R_JUMP_SLOT:
- if(eagerBinding) {
- auto symbol = (elf_sym *)(object->baseAddress + object->symbolTableOffset
- + symbol_index * sizeof(elf_sym));
- ObjectSymbol r(object, symbol);
- auto p = Scope::resolveGlobalOrLocal(*globalScope, object->localScope, r.getString(), object->objectRts, 0);
-
- if(!p) {
- if(ELF_ST_BIND(symbol->st_info) != STB_WEAK)
- mlibc::panicLogger() << "rtdl: Unresolved JUMP_SLOT symbol "
- << r.getString() << " in object " << object->name << frg::endlog;
-
- if(verbose)
- mlibc::infoLogger() << "rtdl: Unresolved weak JUMP_SLOT symbol "
- << r.getString() << " in object " << object->name << frg::endlog;
- *((uintptr_t *)rel_addr) = 0;
- }else{
- *((uintptr_t *)rel_addr) = p->virtualAddress();
- }
- }else{
- *((uintptr_t *)rel_addr) += object->baseAddress;
- }
- break;
-#if defined(__x86_64__)
- case R_X86_64_IRELATIVE: {
- auto ptr = object->baseAddress + addend;
- auto target = reinterpret_cast<uintptr_t (*)(void)>(ptr)();
- *((uintptr_t *)rel_addr) = target;
- break;
- }
-#endif
-// TODO: TLSDESC relocations aren't aarch64 specific
-#if defined(__aarch64__)
- case R_AARCH64_TLSDESC: {
- size_t symValue = 0;
- SharedObject *target = nullptr;
-
- if (symbol_index) {
- auto symbol = (elf_sym *)(object->baseAddress + object->symbolTableOffset
- + symbol_index * sizeof(elf_sym));
- ObjectSymbol r(object, symbol);
- auto p = Scope::resolveGlobalOrLocal(*globalScope, object->localScope, r.getString(), object->objectRts, 0);
-
- if (!p) {
- __ensure(ELF_ST_BIND(symbol->st_info) != STB_WEAK);
- mlibc::panicLogger() << "rtdl: Unresolved TLSDESC for symbol "
- << r.getString() << " in object " << object->name << frg::endlog;
- } else {
- target = p->object();
- if (p->symbol())
- symValue = p->symbol()->st_value;
- }
- } else {
- target = object;
- }
-
- __ensure(target);
-
- if (target->tlsModel == TlsModel::initial) {
- ((uint64_t *)rel_addr)[0] = reinterpret_cast<uintptr_t>(&__mlibcTlsdescStatic);
- // TODO: guard the subtraction of TCB size with `if constexpr (tlsAboveTp)`
- // for the arch-generic case
- __ensure(tlsAboveTp == true);
- ((uint64_t *)rel_addr)[1] = symValue + target->tlsOffset + addend - sizeof(Tcb);
- } else {
- struct TlsdescData {
- uintptr_t tlsIndex;
- uintptr_t addend;
- };
-
- // Access DTV for object to force the entry to be allocated and initialized
- accessDtv(target);
-
- __ensure(target->tlsIndex < mlibc::get_current_tcb()->dtvSize);
-
- // TODO: We should free this when the DSO gets destroyed
- auto data = frg::construct<TlsdescData>(getAllocator());
- data->tlsIndex = target->tlsIndex;
- data->addend = symValue + addend;
-
- ((uint64_t *)rel_addr)[0] = reinterpret_cast<uintptr_t>(&__mlibcTlsdescDynamic);
- ((uint64_t *)rel_addr)[1] = reinterpret_cast<uintptr_t>(data);
- }
- } break;
-#endif
- default:
- mlibc::panicLogger() << "unimplemented lazy relocation type " << type << frg::endlog;
- break;
- }
- }
-}
-