shadPS4/emulator/Loader/Elf.cpp

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#include "Elf.h"
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#include <fmt/core.h>
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Elf::~Elf()
{
Reset();
}
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static self_header* load_self(FsFile& f)
{
//read self header
auto* self = new self_header;
f.Read(self, sizeof(self_header));
return self;
}
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static self_segment_header* load_self_segments(FsFile& f, u16 num)
{
auto* segs = new self_segment_header[num];
f.Read(segs, sizeof(self_segment_header) * num);
return segs;
}
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static elf_header* load_elf_header(FsFile& f)
{
auto* m_elf_header = new elf_header;
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f.Read(m_elf_header, sizeof(elf_header));
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return m_elf_header;
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}
static elf_program_header* load_program_header(FsFile& f, u64 offset, u16 num)
{
auto* phdr = new elf_program_header[num];
f.Seek(offset,fsSeekMode::fsSeekSet);
f.Read(phdr, sizeof(elf_program_header) * num);
return phdr;
}
static elf_section_header* load_section_header(FsFile& f, u64 offset, u16 num)
{
if (num == 0)//just in case we don't have section headers
{
return nullptr;
}
auto* shdr = new elf_section_header[num];
f.Seek(offset,fsSeekMode::fsSeekSet);
f.Read(shdr, sizeof(elf_section_header) * num);
return shdr;
}
void Elf::Reset()//reset all variables
{
if (m_f != nullptr)
{
m_f->Close();
delete m_f;
}
delete m_self;
delete m_elf_header;
delete[] m_self_segments;
delete[] m_elf_phdr;
delete[] m_elf_shdr;
m_self = nullptr;
m_self_segments = nullptr;
m_elf_header = nullptr;
m_elf_phdr = nullptr;
m_elf_shdr = nullptr;
}
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void Elf::Open(const std::string& file_name)
{
Reset();//reset all variables
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m_f = new FsFile;
m_f->Open(file_name, fsOpenMode::fsRead);
m_self = load_self(*m_f);
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if (!isSelfFile())
{
delete m_self;
m_self = nullptr;
m_f->Seek(0,fsSeekMode::fsSeekSet); //it is not an self file move to the start of file
}
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else
{
m_self_segments = load_self_segments(*m_f, m_self->segment_count);
}
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auto elfheader_pos = m_f->Tell();//get the entry pos for elf file
m_elf_header = load_elf_header(*m_f);
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if (!isElfFile())
{
delete m_elf_header;
m_elf_header = nullptr;
}
if (m_elf_header != nullptr)
{
m_elf_phdr = load_program_header(*m_f, elfheader_pos + m_elf_header->e_phoff, m_elf_header->e_phnum);
m_elf_shdr = load_section_header(*m_f, elfheader_pos + m_elf_header->e_shoff, m_elf_header->e_shnum);
}
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DebugDump();
}
bool Elf::isSelfFile() const
{
if (m_f == nullptr)
{
return false;
}
if (m_self == nullptr)
{
return false;//if we can't load self header return false
}
if (m_self->magic != self_header::signature)
{
printf("Not a SELF file. Magic file mismatched! current = 0x%08X required = 0x%08X\n", m_self->magic, self_header::signature);
return false;
}
if (m_self->version != 0x00 || m_self->mode != 0x01 || m_self->endian != 0x01 || m_self->attributes != 0x12)
{
printf("Unknown SELF file\n");
return false;
}
if (m_self->category != 0x01 || m_self->program_type != 0x01)
{
printf("Unknown SELF file\n");
return false;
}
return true;
}
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bool Elf::isElfFile() const
{
if (m_f == nullptr)
{
return false;
}
if (m_elf_header == nullptr)
{
return false;
}
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if (m_elf_header->e_ident[EI_MAG0] != ELFMAG0 || m_elf_header->e_ident[EI_MAG1] != ELFMAG1 || m_elf_header->e_ident[EI_MAG2] != ELFMAG2 ||
m_elf_header->e_ident[EI_MAG3] != ELFMAG3)
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{
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printf("ERROR:Not an ELF file magic is wrong!\n");
return false;
}
if (m_elf_header->e_ident[EI_CLASS] != ELFCLASS64)
{
printf("ERROR:e_ident[EI_CLASS] expected 0x02 is (0x%x)\n", m_elf_header->e_ident[EI_CLASS]);
return false;
}
if (m_elf_header->e_ident[EI_DATA] != ELFDATA2LSB)
{
printf("ERROR:e_ident[EI_DATA] expected 0x01 is (0x%x)\n", m_elf_header->e_ident[EI_DATA]);
return false;
}
if (m_elf_header->e_ident[EI_VERSION] != EV_CURRENT)
{
printf("ERROR:e_ident[EI_VERSION] expected 0x01 is (0x%x)\n", m_elf_header->e_ident[EI_VERSION]);
return false;
}
if (m_elf_header->e_ident[EI_OSABI] != ELFOSABI_FREEBSD)
{
printf("ERROR:e_ident[EI_OSABI] expected 0x09 is (0x%x)\n", m_elf_header->e_ident[EI_OSABI]);
return false;
}
if (m_elf_header->e_ident[EI_ABIVERSION] != ELFABIVERSION_AMDGPU_HSA_V2)
{
printf("ERROR:e_ident[EI_ABIVERSION] expected 0x00 is (0x%x)\n", m_elf_header->e_ident[EI_ABIVERSION]);
return false;
}
if (m_elf_header->e_type != ET_DYNEXEC && m_elf_header->e_type != ET_DYNAMIC)
{
printf("ERROR:e_type expected 0xFE10 OR 0xFE18 is (%04x)\n", m_elf_header->e_type);
return false;
}
if (m_elf_header->e_machine != EM_X86_64)
{
printf("ERROR:e_machine expected 0x3E is (%04x)\n", m_elf_header->e_machine);
return false;
}
if (m_elf_header->e_version != EV_CURRENT)
{
printf("ERROR:m_elf_header->e_version expected 0x01 is (0x%x)\n", m_elf_header->e_version);
return false;
}
if (m_elf_header->e_phentsize != sizeof(elf_program_header))
{
printf("ERROR:e_phentsize (%d) != sizeof(elf_program_header)\n", m_elf_header->e_phentsize);
return false;
}
if (m_elf_header->e_shentsize > 0 && m_elf_header->e_shentsize != sizeof(elf_section_header)) //commercial games doesn't appear to have section headers
{
printf("ERROR:e_shentsize (%d) != sizeof(elf_section_header)\n", m_elf_header->e_shentsize);
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return false;
}
return true;
}
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void Elf::DebugDump() {
printf("SELF header:\n");
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fmt::print(" magic ..............: 0x{:x}\n", m_self->magic);
fmt::print(" version .........: {}\n", m_self->version);
fmt::print(" mode .........: {:#04x}\n", m_self->mode);
fmt::print(" endian .........: {}\n", m_self->endian);
fmt::print(" attributes .........: {:#04x}\n", m_self->attributes);
fmt::print(" category .........: {:#04x}\n", m_self->category);
fmt::print(" program_type........: {:#04x}\n", m_self->program_type);
fmt::print(" padding1 ...........: {:#06x}\n", m_self->padding1);
fmt::print(" header size ........: {}\n", m_self->header_size);
fmt::print(" meta size .....: {}\n", m_self->meta_size);
fmt::print(" file size ..........: {}\n", m_self->file_size);
fmt::print(" padding2 ...........: {:#010x}\n", m_self->padding2);
fmt::print(" segment count ......: {}\n", m_self->segment_count);
fmt::print(" unknown 1A .........: {:#06x}\n", m_self->unknown1A);
fmt::print(" padding3 ...........: {:#010x}\n", m_self->padding3);
fmt::print("\n");
fmt::print("SELF segments:\n");
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for (int i = 0; i < m_self->segment_count; i++)
{
auto segment_header = m_self_segments[i];
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fmt::print(" [{}]\n", i);
fmt::print(" flags ............: {:#018x}\n", segment_header.flags);
fmt::print(" file offset ......: {:#018x}\n", segment_header.file_offset);
fmt::print(" file size ........: {}\n", segment_header.file_size);
fmt::print(" memory size ......: {}\n", segment_header.memory_size);
}
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fmt::print("\n");
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fmt::print("Elf header:\n");
fmt::print(" ident .........: 0x");
for (auto i : m_elf_header->e_ident)
{
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fmt::print("{:02x}", i);
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}
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fmt::print("\n");
fmt::print(" type .........: {:#06x}\n", m_elf_header->e_type);
fmt::print(" machine .......: {:#06x}\n", m_elf_header->e_machine);
fmt::print(" version .......: {:#010x}\n", m_elf_header->e_version);
fmt::print(" entry .........: {:#018x}\n", m_elf_header->e_entry);
fmt::print(" phoff .........: {:#018x}\n", m_elf_header->e_phoff);
fmt::print(" shoff .........: {:#018x}\n", m_elf_header->e_shoff);
fmt::print(" flags .........: {:#010x}\n", m_elf_header->e_flags);
fmt::print(" ehsize ........: {:#06x}\n", m_elf_header->e_ehsize);
fmt::print(" phentsize .....: {:#06x}\n", m_elf_header->e_phentsize);
fmt::print(" phnum .........: {}\n", m_elf_header->e_phnum);
fmt::print(" shentsize .....: {:#06x}\n", m_elf_header->e_shentsize);
fmt::print(" shnum .........: {}\n", m_elf_header->e_shnum);
fmt::print(" shstrndx ......: {}\n", m_elf_header->e_shstrndx);
if (m_elf_header->e_phentsize > 0)
{
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fmt::print("Program headers:\n");
for (u16 i = 0; i < m_elf_header->e_phnum; i++)
{
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fmt::print("--- phdr [{}] ---\n", i);
fmt::print("p_type ....: {:#010x}\n", (m_elf_phdr+i)->p_type);
fmt::print("p_flags ...: {:#010x}\n", (m_elf_phdr + i)->p_flags);
fmt::print("p_offset ..: {:#018x}\n", (m_elf_phdr + i)->p_offset);
fmt::print("p_vaddr ...: {:#018x}\n", (m_elf_phdr + i)->p_vaddr);
fmt::print("p_paddr ...: {:#018x}\n", (m_elf_phdr + i)->p_paddr);
fmt::print("p_filesz ..: {:#018x}\n", (m_elf_phdr + i)->p_filesz);
fmt::print("p_memsz ...: {:#018x}\n", (m_elf_phdr + i)->p_memsz);
fmt::print("p_align ...: {:#018x}\n", (m_elf_phdr + i)->p_align);
}
}
if (m_elf_header->e_shentsize > 0)
{
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fmt::print("Section headers:\n");
for (uint16_t i = 0; i < m_elf_header->e_shnum; i++)
{
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fmt::print("--- shdr [%d] --\n", i);
fmt::print("sh_name ........: {}\n", (m_elf_shdr + i)->sh_name);
fmt::print("sh_type ........: {:#010x}\n", (m_elf_shdr + i)->sh_type);
fmt::print("sh_flags .......: {:#018x}\n", (m_elf_shdr + i)->sh_flags);
fmt::print("sh_addr ........: {:#018x}\n", (m_elf_shdr + i)->sh_addr);
fmt::print("sh_offset ......: {:#018x}\n", (m_elf_shdr + i)->sh_offset);
fmt::print("sh_size ........: {:#018x}\n", (m_elf_shdr + i)->sh_size);
fmt::print("sh_link ........: {:#010x}\n", (m_elf_shdr + i)->sh_link);
fmt::print("sh_info ........: {:#010x}\n", (m_elf_shdr + i)->sh_info);
fmt::print("sh_addralign ...: {:#018x}\n", (m_elf_shdr + i)->sh_addralign);
fmt::print("sh_entsize .....: {:#018x}\n", (m_elf_shdr + i)->sh_entsize);
}
}
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}