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LibC+LibELF: Implement support for the dl_iterate_phdr helper

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This helper is used by libgcc_s to figure out where the .eh_frame sections
are located for all loaded shared objects.
This commit is contained in:
Gunnar Beutner 2021-04-16 21:53:43 +02:00 • committed by Andreas Kling
parent cf13fa57cd
commit 6cb28ecee8
20 changed files with 171 additions and 25 deletions
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23
Userland/Libraries/LibELF/DynamicObject.cpp
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@ -28,18 +28,19 @@
#include <AK/Debug.h>
#include <AK/String.h>
#include <AK/StringBuilder.h>
#include <LibC/elf.h>
#include <LibELF/DynamicLoader.h>
#include <LibELF/DynamicObject.h>
#include <LibELF/Hashes.h>
#include <LibELF/exec_elf.h>
#include <string.h>
namespace ELF {
static const char* name_for_dtag(Elf32_Sword d_tag);
DynamicObject::DynamicObject(VirtualAddress base_address, VirtualAddress dynamic_section_address)
: m_base_address(base_address)
DynamicObject::DynamicObject(const String& filename, VirtualAddress base_address, VirtualAddress dynamic_section_address)
: m_filename(filename)
, m_base_address(base_address)
, m_dynamic_address(dynamic_section_address)
{
auto* header = (Elf32_Ehdr*)base_address.as_ptr();
@ -255,6 +256,18 @@ DynamicObject::RelocationSection DynamicObject::plt_relocation_section() const
return RelocationSection(Section(*this, m_plt_relocation_offset_location, m_size_of_plt_relocation_entry_list, m_size_of_relocation_entry, "DT_JMPREL"sv));
}
Elf32_Half DynamicObject::program_header_count() const
{
auto* header = (const Elf32_Ehdr*)m_base_address.as_ptr();
return header->e_phnum;
}
const Elf32_Phdr* DynamicObject::program_headers() const
{
auto* header = (const Elf32_Ehdr*)m_base_address.as_ptr();
return (const Elf32_Phdr*)(m_base_address.as_ptr() + header->e_phoff);
}
auto DynamicObject::HashSection::lookup_sysv_symbol(const StringView& name, u32 hash_value) const -> Optional<Symbol>
{
u32* hash_table_begin = (u32*)address().as_ptr();
@ -447,9 +460,9 @@ auto DynamicObject::lookup_symbol(const StringView& name, u32 gnu_hash, u32 sysv
return SymbolLookupResult { symbol.value(), symbol.address(), symbol.bind(), this };
}
NonnullRefPtr<DynamicObject> DynamicObject::create(VirtualAddress base_address, VirtualAddress dynamic_section_address)
NonnullRefPtr<DynamicObject> DynamicObject::create(const String& filename, VirtualAddress base_address, VirtualAddress dynamic_section_address)
{
return adopt(*new DynamicObject(base_address, dynamic_section_address));
return adopt(*new DynamicObject(filename, base_address, dynamic_section_address));
}
// offset is in PLT relocation table