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DynamicLoader: Add few more TLS relocations

This commit is contained in:
Bananymous 2025-06-16 15:06:48 +03:00
parent b97c123764
commit 4a00cb7d55
1 changed files with 61 additions and 9 deletions
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70
userspace/programs/DynamicLoader/main.cpp
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@ -332,17 +332,63 @@ static void handle_tls_relocation(const LoadedElf& elf, const RelocT& reloc)
if (!is_tls_relocation(reloc))
return;
if (ELF_R_SYM(reloc.r_info))
print_error_and_exit("tls relocation with symbol index", 0);
const LoadedElf* symbol_elf = &elf;
uintptr_t symbol_offset = 0;
if (elf.tls_addr == nullptr)
print_error_and_exit("tls relocation without tls", 0);
if (const uint32_t symbol_index = ELF_R_SYM(reloc.r_info))
{
const auto& symbol = *reinterpret_cast<ElfNativeSymbol*>(elf.symtab + symbol_index * elf.syment);
const char* symbol_name = reinterpret_cast<const char*>(elf.strtab + symbol.st_name);
if (symbol.st_shndx && ELF_ST_BIND(symbol.st_info) != STB_WEAK)
symbol_offset = symbol.st_value;
else
{
symbol_elf = nullptr;
for (size_t i = 0; i < s_loaded_file_count; i++)
{
const auto* match = find_symbol(s_loaded_files[i], symbol_name);
if (match == nullptr)
continue;
if (symbol_elf == nullptr || ELF_ST_BIND(match->st_info) != STB_WEAK)
{
symbol_elf = &s_loaded_files[i];
symbol_offset = match->st_value;
}
if (ELF_ST_BIND(match->st_info) != STB_WEAK)
break;
}
if (symbol_elf == nullptr && ELF_ST_BIND(symbol.st_info) != STB_WEAK)
{
print(STDERR_FILENO, elf.path);
print(STDERR_FILENO, ": could not find symbol \"");
print(STDERR_FILENO, symbol_name);
print_error_and_exit("\"", 0);
}
if (ELF_ST_TYPE(symbol.st_info) != STT_TLS)
print_error_and_exit("i don't think this is supposed to happen 1", 0);
}
}
if (symbol_elf == nullptr)
print_error_and_exit("i don't think this is supposed to happen 2", 0);
if (symbol_elf->tls_addr == nullptr)
print_error_and_exit("i don't think this is supposed to happen 3", 0);
#if defined(__x86_64__)
switch (ELF64_R_TYPE(reloc.r_info))
{
case R_X86_64_DTPMOD64:
*reinterpret_cast<uint64_t*>(elf.base + reloc.r_offset) = elf.tls_module;
*reinterpret_cast<uint64_t*>(elf.base + reloc.r_offset) = symbol_elf->tls_module;
break;
case R_X86_64_DTPOFF64:
*reinterpret_cast<uint64_t*>(elf.base + reloc.r_offset) = symbol_offset;
break;
case R_X86_64_TPOFF64:
*reinterpret_cast<uint64_t*>(elf.base + reloc.r_offset) = symbol_offset - symbol_elf->tls_offset;
break;
default:
print(STDERR_FILENO, "unsupported tls reloc type ");
@ -354,12 +400,18 @@ static void handle_tls_relocation(const LoadedElf& elf, const RelocT& reloc)
#elif defined(__i686__)
switch (ELF32_R_TYPE(reloc.r_info))
{
case R_386_TLS_TPOFF:
*reinterpret_cast<uint32_t*>(elf.base + reloc.r_offset) = symbol_offset - symbol_elf->tls_offset;
break;
case R_386_TLS_DTPMOD32:
*reinterpret_cast<uint32_t*>(elf.base + reloc.r_offset) = elf.tls_module;
*reinterpret_cast<uint32_t*>(elf.base + reloc.r_offset) = symbol_elf->tls_module;
break;
case R_386_TLS_DTPOFF32:
*reinterpret_cast<uint32_t*>(elf.base + reloc.r_offset) = symbol_offset;
break;
default:
print(STDERR_FILENO, "unsupported tls reloc type ");
print_uint(STDERR_FILENO, ELF64_R_TYPE(reloc.r_info));
print_uint(STDERR_FILENO, ELF32_R_TYPE(reloc.r_info));
print(STDERR_FILENO, " in ");
print(STDERR_FILENO, elf.path);
print_error_and_exit("", 0);
@ -1074,7 +1126,7 @@ static MasterTLS initialize_master_tls()
auto& elf = s_loaded_files[i];
elf.tls_addr = tls_buffer;
elf.tls_module = tls_module++;
elf.tls_offset = master_tls_size - tls_offset;
elf.tls_offset = tls_offset;
}
return { .addr = master_tls_addr, .size = master_tls_size, .module_count = module_count };
@ -1117,7 +1169,7 @@ static void initialize_tls(MasterTLS master_tls)
const auto& elf = s_loaded_files[i];
if (elf.tls_addr == nullptr)
continue;
uthread->dtv[elf.tls_module] = reinterpret_cast<uintptr_t>(tls_addr) + elf.tls_offset;
uthread->dtv[elf.tls_module] = reinterpret_cast<uintptr_t>(tls_addr) + uthread->master_tls_size - elf.tls_offset;
}
syscall(SYS_SET_TLS, uthread);