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initial dynamic loader , parsing DT_HASH atm

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This commit is contained in:
georgemoralis 2023-06-08 12:51:11 +03:00
parent e02c0a9398
commit 672e2b2d77
3 changed files with 41 additions and 0 deletions
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19
src/Core/PS4/Linker.cpp
View file

@ -47,6 +47,7 @@ Module* Linker::LoadModule(const std::string& elf_name)
if (m->elf->isElfFile())
{
LoadModuleToMemory(m);
LoadDynamicInfo(m);
}
else
{
@ -157,4 +158,22 @@ void Linker::LoadModuleToMemory(Module* m)
offset += instruction.info.length;
runtime_address += instruction.info.length;
}
}
void Linker::LoadDynamicInfo(Module* m)
{
m->dynamic_info = new DynamicModuleInfo;
for (const auto* dyn = static_cast<elf_dynamic*>(m->m_dynamic); dyn->d_tag != DT_NULL; dyn++)
{
switch (dyn->d_tag)
{
case DT_OS_HASH:
m->dynamic_info->hash_table = reinterpret_cast<void*>(static_cast<uint8_t*>(m->m_dynamic_data) + dyn->d_un.d_ptr);
break;
default:
LOG_INFO_IF(debug_loader, "unsupported dynamic tag ..........: {:#018x}\n", dyn->d_tag);
}
}
}

9
src/Core/PS4/Linker.h
View file

@ -2,6 +2,8 @@
#include "../../Loader/Elf.h"
#include <vector>
struct DynamicModuleInfo;
/*this struct keeps neccesary info about loaded modules.Main executeable is included too as well*/
struct Module
{
@ -11,6 +13,12 @@ struct Module
void* m_dynamic = nullptr;
void* m_dynamic_data = nullptr;
DynamicModuleInfo* dynamic_info = nullptr;
};
struct DynamicModuleInfo
{
void* hash_table = nullptr;
};
class Linker
@ -22,6 +30,7 @@ public:
Module* LoadModule(const std::string& elf_name);
Module* FindModule(/*u32 id*/);
void LoadModuleToMemory(Module* m);
void LoadDynamicInfo(Module* program);
private:
std::vector<Module*> m_modules;

13
src/Loader/Elf.h
View file

@ -323,6 +323,19 @@ struct elf_program_id_header
u64 firmver;
u08 digest[32];
};
constexpr s64 DT_NULL = 0;
constexpr s64 DT_OS_HASH = 0x61000025;
struct elf_dynamic
{
s64 d_tag;
union
{
u64 d_val;
u64 d_ptr;
} d_un;
};
class Elf
{
public: