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1682f0b760
SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
95 lines
2.7 KiB
C++
95 lines
2.7 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/HashMap.h>
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#include <AK/LexicalPath.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 <LibELF/DynamicLoader.h>
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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 <unistd.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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TODO();
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}
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auto basename = LexicalPath(filename).basename();
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auto existing_elf_object = g_elf_objects.get(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 < 0) {
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g_dlerror_msg = String::formatted("Unable to open file {}", 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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auto loader = ELF::DynamicLoader::try_create(fd, filename);
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if (!loader || !loader->is_valid()) {
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g_dlerror_msg = String::formatted("{} is not a valid ELF dynamic shared object!", filename);
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return nullptr;
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}
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auto object = loader->map();
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if (!object || !loader->link(flags, /* total_tls_size (FIXME) */ 0)) {
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g_dlerror_msg = String::formatted("Failed to load ELF object {}", filename);
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return nullptr;
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}
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g_elf_objects.set(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(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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VERIFY(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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