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LibELF+LibC: Add support for aarch64 relocations

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This commit adds the used relocation types to elf.h, and handles the
types in DynamicLoader and DynamicObject. No new functionalitty has to
be added, as the same code can be reused between aarch64 and x86_64.
This commit is contained in:
Timon Kruiper 2023-01-31 09:45:50 +01:00 • committed by Jelle Raaijmakers
parent cfd73e5d9f
commit ed3be5b7f5
3 changed files with 10 additions and 1 deletions
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4
Userland/Libraries/LibC/elf.h
View file

@ -822,4 +822,8 @@ struct elf_args {
#define R_X86_64_TPOFF64 18
#define R_X86_64_IRELATIVE 37
#define R_AARCH64_ABS64 257
#define R_AARCH64_GLOB_DAT 1025
#define R_AARCH64_JUMP_SLOT 1026
#define R_AARCH64_RELATIVE 1027
#define R_AARCH64_TLS_TPREL64 1030

5
Userland/Libraries/LibELF/DynamicLoader.cpp
View file

@ -482,6 +482,7 @@ DynamicLoader::RelocationResult DynamicLoader::do_relocation(const ELF::DynamicO
// Apparently most loaders will just skip these?
// Seems if the 'link editor' generates one something is funky with your code
break;
case R_AARCH64_ABS64:
case R_X86_64_64: {
auto symbol = relocation.symbol();
auto res = lookup_symbol(symbol);
@ -500,6 +501,7 @@ DynamicLoader::RelocationResult DynamicLoader::do_relocation(const ELF::DynamicO
*patch_ptr = call_ifunc_resolver(VirtualAddress { *patch_ptr }).get();
break;
}
case R_AARCH64_GLOB_DAT:
case R_X86_64_GLOB_DAT: {
auto symbol = relocation.symbol();
auto res = lookup_symbol(symbol);
@ -528,6 +530,7 @@ DynamicLoader::RelocationResult DynamicLoader::do_relocation(const ELF::DynamicO
*patch_ptr = symbol_location.get();
break;
}
case R_AARCH64_RELATIVE:
case R_X86_64_RELATIVE: {
if (!image().is_dynamic())
break;
@ -540,6 +543,7 @@ DynamicLoader::RelocationResult DynamicLoader::do_relocation(const ELF::DynamicO
*patch_ptr += m_dynamic_object->base_address().get();
break;
}
case R_AARCH64_TLS_TPREL64:
case R_X86_64_TPOFF64: {
auto symbol = relocation.symbol();
FlatPtr symbol_value;
@ -565,6 +569,7 @@ DynamicLoader::RelocationResult DynamicLoader::do_relocation(const ELF::DynamicO
break;
}
case R_AARCH64_JUMP_SLOT:
case R_X86_64_JUMP_SLOT: {
// FIXME: Or BIND_NOW flag passed in?
if (m_dynamic_object->must_bind_now()) {

2
Userland/Libraries/LibELF/DynamicObject.cpp
View file

@ -484,7 +484,7 @@ NonnullRefPtr<DynamicObject> DynamicObject::create(DeprecatedString const& filep
VirtualAddress DynamicObject::patch_plt_entry(u32 relocation_offset)
{
auto relocation = plt_relocation_section().relocation_at_offset(relocation_offset);
VERIFY(relocation.type() == R_X86_64_JUMP_SLOT);
VERIFY(relocation.type() == R_X86_64_JUMP_SLOT || relocation.type() == R_AARCH64_JUMP_SLOT);
auto symbol = relocation.symbol();
auto relocation_address = (FlatPtr*)relocation.address().as_ptr();