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21b5909dc6
This is for consistency with other namespace changes that were made a while back to the other libraries :)
128 lines
4.2 KiB
C++
128 lines
4.2 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <assert.h>
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#include <dlfcn.h>
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#include <fcntl.h>
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#include <mman.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <AK/FileSystemPath.h>
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#include <AK/HashMap.h>
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#include <AK/RefPtr.h>
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#include <AK/ScopeGuard.h>
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#include <AK/String.h>
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#include <AK/StringBuilder.h>
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#include <LibELF/DynamicLoader.h>
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// NOTE: The string here should never include a trailing newline (according to POSIX)
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String g_dlerror_msg;
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HashMap<String, RefPtr<ELF::DynamicLoader>> g_elf_objects;
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extern "C" {
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int dlclose(void*)
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{
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g_dlerror_msg = "dlclose not implemented!";
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return -1;
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}
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char* dlerror()
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{
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return const_cast<char*>(g_dlerror_msg.characters());
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}
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void* dlopen(const char* filename, int flags)
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{
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// FIXME: Create a global mutex/semaphore/lock for dlopen/dlclose/dlsym and (?) dlerror
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// FIXME: refcount?
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if (!filename) {
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// FIXME: Return the handle for "the main executable"
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// The Serenity Kernel will keep a mapping of the main elf binary resident in memory,
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// But a future dynamic loader might have a different idea/way of letting us access this information
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ASSERT_NOT_REACHED();
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}
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FileSystemPath file_path(filename);
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auto existing_elf_object = g_elf_objects.get(file_path.basename());
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if (existing_elf_object.has_value()) {
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return const_cast<ELF::DynamicLoader*>(existing_elf_object.value());
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}
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int fd = open(filename, O_RDONLY);
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if (!fd) {
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g_dlerror_msg = String::format("Unable to open file %s", filename);
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return nullptr;
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}
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ScopeGuard close_fd_guard([fd]() { close(fd); });
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struct stat file_stats{};
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int ret = fstat(fd, &file_stats);
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if (ret < 0) {
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g_dlerror_msg = String::format("Unable to stat file %s", filename);
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return nullptr;
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}
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auto loader = ELF::DynamicLoader::construct(filename, fd, file_stats.st_size);
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if (!loader->is_valid()) {
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g_dlerror_msg = String::format("%s is not a valid ELF dynamic shared object!", filename);
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return nullptr;
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}
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if (!loader->load_from_image(flags)) {
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g_dlerror_msg = String::format("Failed to load ELF object %s", filename);
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return nullptr;
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}
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g_elf_objects.set(file_path.basename(), move(loader));
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g_dlerror_msg = "Successfully loaded ELF object.";
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// we have one refcount already
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return const_cast<ELF::DynamicLoader*>(g_elf_objects.get(file_path.basename()).value());
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}
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void* dlsym(void* handle, const char* symbol_name)
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{
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// FIXME: When called with a NULL handle we're supposed to search every dso in the process... that'll get expensive
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ASSERT(handle);
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auto* dso = reinterpret_cast<ELF::DynamicLoader*>(handle);
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void* symbol = dso->symbol_for_name(symbol_name);
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if (!symbol) {
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g_dlerror_msg = "Symbol not found";
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return nullptr;
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}
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return symbol;
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}
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} // extern "C"
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