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Loader: Support loading non-position independent executables

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Itamar 2020-12-18 15:59:22 +02:00 • committed by Andreas Kling
parent 0cb636078a
commit a83a9f3a55
5 changed files with 88 additions and 41 deletions
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27
Userland/DynamicLoader/main.cpp
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@ -107,6 +107,7 @@ static void perform_self_relocations(auxv_t* auxvp)
dynamic_object->relocation_section().for_each_relocation([base_address](auto& reloc) {
if (reloc.type() != R_386_RELATIVE)
return IterationDecision::Continue;
*(u32*)reloc.address().as_ptr() += base_address;
return IterationDecision::Continue;
});
@ -171,10 +172,10 @@ static Vector<String> get_dependencies(const String& name)
static void map_dependencies(const String& name)
{
VERBOSE("mapping dependencies for: %s", name.characters());
VERBOSE("mapping dependencies for: %s\n", name.characters());
for (const auto& needed_name : get_dependencies(name)) {
VERBOSE("needed library: %s", needed_name.characters());
VERBOSE("needed library: %s\n", needed_name.characters());
String library_name = get_library_name(needed_name);
if (!g_loaders.contains(library_name)) {
@ -193,7 +194,7 @@ static void allocate_tls()
}
if (total_tls_size) {
[[maybe_unused]] void* tls_address = allocate_tls(total_tls_size);
VERBOSE("from userspace, tls_address: %p", tls_address);
VERBOSE("from userspace, tls_address: %p\n", tls_address);
}
g_total_tls_size = total_tls_size;
}
@ -224,17 +225,17 @@ static void initialize_libc()
static void load_elf(const String& name)
{
VERBOSE("load_elf: %s", name.characters());
VERBOSE("load_elf: %s\n", name.characters());
auto loader = g_loaders.get(name).value();
VERBOSE("a1\n");
for (const auto& needed_name : get_dependencies(name)) {
VERBOSE("needed library: %s", needed_name.characters());
VERBOSE("needed library: %s\n", needed_name.characters());
String library_name = get_library_name(needed_name);
if (!g_loaded_objects.contains(library_name)) {
load_elf(library_name);
}
}
VERBOSE("loading: %s", name.characters());
auto dynamic_object = loader->load_from_image(RTLD_GLOBAL | RTLD_LAZY, g_total_tls_size);
ASSERT(!dynamic_object.is_null());
g_loaded_objects.set(name, dynamic_object.release_nonnull());
@ -270,7 +271,7 @@ static FlatPtr loader_main(auxv_t* auxvp)
VERBOSE("loaded all dependencies");
for ([[maybe_unused]] auto& lib : g_loaders) {
VERBOSE("%s - tls size: %u, tls offset: %u", lib.key.characters(), lib.value->tls_size(), lib.value->tls_offset());
VERBOSE("%s - tls size: %u, tls offset: %u\n", lib.key.characters(), lib.value->tls_size(), lib.value->tls_offset());
}
allocate_tls();
@ -278,8 +279,12 @@ static FlatPtr loader_main(auxv_t* auxvp)
load_elf(main_program_name);
auto main_program_lib = g_loaders.get(main_program_name).value();
FlatPtr entry_point = reinterpret_cast<FlatPtr>(main_program_lib->image().entry().as_ptr() + (FlatPtr)main_program_lib->text_segment_load_address().as_ptr());
VERBOSE("entry point: %p", entry_point);
FlatPtr entry_point = reinterpret_cast<FlatPtr>(main_program_lib->image().entry().as_ptr());
if (main_program_lib->is_dynamic())
entry_point += reinterpret_cast<FlatPtr>(main_program_lib->text_segment_load_address().as_ptr());
VERBOSE("entry point: %p\n", entry_point);
// This will unmap the temporary memory maps we had for loading the libraries
clear_temporary_objects_mappings();
@ -310,9 +315,9 @@ void _start(int argc, char** argv, char** envp)
}
MainFunction main_function = (MainFunction)(entry);
VERBOSE("jumping to main program entry point: %p", main_function);
VERBOSE("jumping to main program entry point: %p\n", main_function);
int rc = main_function(argc, argv, envp);
VERBOSE("rc: %d", rc);
VERBOSE("rc: %d\n", rc);
if (g_libc_exit != nullptr) {
g_libc_exit(rc);
} else {