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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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14
Userland/Libraries/LibELF/DynamicObject.h
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@ -29,14 +29,15 @@
#include <AK/Assertions.h>
#include <AK/RefCounted.h>
#include <AK/String.h>
#include <Kernel/VirtualAddress.h>
#include <LibELF/exec_elf.h>
#include <LibC/elf.h>
namespace ELF {
class DynamicObject : public RefCounted<DynamicObject> {
public:
static NonnullRefPtr<DynamicObject> create(VirtualAddress base_address, VirtualAddress dynamic_section_address);
static NonnullRefPtr<DynamicObject> create(const String& filename, VirtualAddress base_address, VirtualAddress dynamic_section_address);
~DynamicObject();
void dump() const;
@ -238,6 +239,8 @@ public:
VirtualAddress plt_got_base_address() const { return m_base_address.offset(m_procedure_linkage_table_offset.value()); }
VirtualAddress base_address() const { return m_base_address; }
const String& filename() const { return m_filename; }
StringView rpath() const { return m_has_rpath ? symbol_string_table_string(m_rpath_index) : StringView {}; }
StringView runpath() const { return m_has_runpath ? symbol_string_table_string(m_runpath_index) : StringView {}; }
StringView soname() const { return m_has_soname ? symbol_string_table_string(m_soname_index) : StringView {}; }
@ -247,6 +250,9 @@ public:
void set_tls_offset(FlatPtr offset) { m_tls_offset = offset; }
void set_tls_size(FlatPtr size) { m_tls_size = size; }
Elf32_Half program_header_count() const;
const Elf32_Phdr* program_headers() const;
template<typename F>
void for_each_needed_library(F) const;
@ -275,12 +281,14 @@ public:
bool elf_is_dynamic() const { return m_is_elf_dynamic; }
private:
explicit DynamicObject(VirtualAddress base_address, VirtualAddress dynamic_section_address);
explicit DynamicObject(const String& filename, VirtualAddress base_address, VirtualAddress dynamic_section_address);
StringView symbol_string_table_string(Elf32_Word) const;
const char* raw_symbol_string_table_string(Elf32_Word) const;
void parse();
String m_filename;
VirtualAddress m_base_address;
VirtualAddress m_dynamic_address;
VirtualAddress m_elf_base_address;