mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 20:42:43 +00:00
115 lines
4 KiB
C++
115 lines
4 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <AK/HashMap.h>
|
|
#include <AK/LexicalPath.h>
|
|
#include <AK/RefPtr.h>
|
|
#include <AK/ScopeGuard.h>
|
|
#include <AK/String.h>
|
|
#include <LibELF/DynamicLoader.h>
|
|
#include <assert.h>
|
|
#include <dlfcn.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
|
|
// NOTE: The string here should never include a trailing newline (according to POSIX)
|
|
String g_dlerror_msg;
|
|
|
|
HashMap<String, RefPtr<ELF::DynamicLoader>> g_elf_objects;
|
|
|
|
extern "C" {
|
|
|
|
int dlclose(void*)
|
|
{
|
|
g_dlerror_msg = "dlclose not implemented!";
|
|
return -1;
|
|
}
|
|
|
|
char* dlerror()
|
|
{
|
|
return const_cast<char*>(g_dlerror_msg.characters());
|
|
}
|
|
|
|
void* dlopen(const char* filename, int flags)
|
|
{
|
|
// FIXME: Create a global mutex/semaphore/lock for dlopen/dlclose/dlsym and (?) dlerror
|
|
// FIXME: refcount?
|
|
|
|
if (!filename) {
|
|
// FIXME: Return the handle for "the main executable"
|
|
// The Serenity Kernel will keep a mapping of the main elf binary resident in memory,
|
|
// But a future dynamic loader might have a different idea/way of letting us access this information
|
|
TODO();
|
|
}
|
|
|
|
auto basename = LexicalPath(filename).basename();
|
|
|
|
auto existing_elf_object = g_elf_objects.get(basename);
|
|
if (existing_elf_object.has_value()) {
|
|
return const_cast<ELF::DynamicLoader*>(existing_elf_object.value());
|
|
}
|
|
|
|
int fd = open(filename, O_RDONLY);
|
|
if (fd < 0) {
|
|
g_dlerror_msg = String::formatted("Unable to open file {}", filename);
|
|
return nullptr;
|
|
}
|
|
|
|
ScopeGuard close_fd_guard([fd]() { close(fd); });
|
|
|
|
auto loader = ELF::DynamicLoader::try_create(fd, filename);
|
|
if (!loader || !loader->is_valid()) {
|
|
g_dlerror_msg = String::formatted("{} is not a valid ELF dynamic shared object!", filename);
|
|
return nullptr;
|
|
}
|
|
|
|
auto object = loader->map();
|
|
if (!object || !loader->link(flags, /* total_tls_size (FIXME) */ 0)) {
|
|
g_dlerror_msg = String::formatted("Failed to load ELF object {}", filename);
|
|
return nullptr;
|
|
}
|
|
|
|
g_elf_objects.set(basename, move(loader));
|
|
g_dlerror_msg = "Successfully loaded ELF object.";
|
|
|
|
// we have one refcount already
|
|
return const_cast<ELF::DynamicLoader*>(g_elf_objects.get(basename).value());
|
|
}
|
|
|
|
void* dlsym(void* handle, const char* symbol_name)
|
|
{
|
|
// FIXME: When called with a NULL handle we're supposed to search every dso in the process... that'll get expensive
|
|
VERIFY(handle);
|
|
auto* dso = reinterpret_cast<ELF::DynamicLoader*>(handle);
|
|
void* symbol = dso->symbol_for_name(symbol_name);
|
|
if (!symbol) {
|
|
g_dlerror_msg = "Symbol not found";
|
|
return nullptr;
|
|
}
|
|
return symbol;
|
|
}
|
|
|
|
} // extern "C"
|