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//! Hikari ELF Types
const constants = @import("constants.zig");
pub const Elf64Header = extern struct {
magic: [4]u8,
class: u8,
data: u8,
version: u8,
osabi: u8,
abi_version: u8,
padding: [7]u8,
elf_type: u16 align(1),
machine: u16 align(1),
elf_version: u32 align(1),
entry: u64 align(1),
program_header_offset: u64 align(1),
section_header_offset: u64 align(1),
flags: u32 align(1),
header_size: u16 align(1),
program_header_entry_size: u16 align(1),
program_header_count: u16 align(1),
section_header_entry_size: u16 align(1),
section_header_count: u16 align(1),
section_identity_index: u16 align(1),
pub fn is_valid(self: *const Elf64Header) bool {
if (self.magic[0] != constants.magic[0] or
self.magic[1] != constants.magic[1] or
self.magic[2] != constants.magic[2] or
self.magic[3] != constants.magic[3])
{
return false;
}
if (self.class != constants.class_64) {
return false;
}
if (self.data != constants.data_little_endian) {
return false;
}
if (self.version != constants.version_current) {
return false;
}
return true;
}
pub fn is_executable(self: *const Elf64Header) bool {
return self.elf_type == constants.type_executable;
}
pub fn is_x86_64(self: *const Elf64Header) bool {
return self.machine == constants.machine_x86_64;
}
pub fn get_program_headers(self: *const Elf64Header, base: [*]const u8) []const Elf64ProgramHeader {
const phdr_ptr: [*]const Elf64ProgramHeader = @ptrCast(@alignCast(base + self.program_header_offset));
return phdr_ptr[0..self.program_header_count];
}
pub fn get_section_headers(self: *const Elf64Header, base: [*]const u8) []const Elf64SectionHeader {
const shdr_ptr: [*]const Elf64SectionHeader = @ptrCast(@alignCast(base + self.section_header_offset));
return shdr_ptr[0..self.section_header_count];
}
};
pub const Elf64ProgramHeader = extern struct {
segment_type: u32 align(1),
flags: u32 align(1),
offset: u64 align(1),
virtual_address: u64 align(1),
physical_address: u64 align(1),
unit_size: u64 align(1),
memory_size: u64 align(1),
alignment: u64 align(1),
pub fn is_loadable(self: *const Elf64ProgramHeader) bool {
return self.segment_type == constants.segment_load;
}
pub fn is_executable(self: *const Elf64ProgramHeader) bool {
return (self.flags & constants.segment_flag_execute) != 0;
}
pub fn is_writable(self: *const Elf64ProgramHeader) bool {
return (self.flags & constants.segment_flag_write) != 0;
}
pub fn is_readable(self: *const Elf64ProgramHeader) bool {
return (self.flags & constants.segment_flag_read) != 0;
}
pub fn get_data(self: *const Elf64ProgramHeader, base: [*]const u8) []const u8 {
return (base + self.offset)[0..self.unit_size];
}
};
pub const Elf64SectionHeader = extern struct {
identity_offset: u32 align(1),
section_type: u32 align(1),
flags: u64 align(1),
address: u64 align(1),
offset: u64 align(1),
size: u64 align(1),
link: u32 align(1),
info: u32 align(1),
address_alignment: u64 align(1),
entry_size: u64 align(1),
pub fn is_allocatable(self: *const Elf64SectionHeader) bool {
return (self.flags & constants.section_flag_alloc) != 0;
}
pub fn is_writable(self: *const Elf64SectionHeader) bool {
return (self.flags & constants.section_flag_write) != 0;
}
pub fn is_executable(self: *const Elf64SectionHeader) bool {
return (self.flags & constants.section_flag_execinstr) != 0;
}
pub fn is_nobits(self: *const Elf64SectionHeader) bool {
return self.section_type == constants.section_nobits;
}
pub fn get_data(self: *const Elf64SectionHeader, base: [*]const u8) []const u8 {
return (base + self.offset)[0..self.size];
}
};
pub const Elf64Symbol = extern struct {
identity_offset: u32 align(1),
info: u8,
other: u8,
section_index: u16 align(1),
value: u64 align(1),
size: u64 align(1),
pub fn get_binding(self: *const Elf64Symbol) u8 {
return self.info >> 4;
}
pub fn get_type(self: *const Elf64Symbol) u8 {
return self.info & 0x0F;
}
pub fn get_visibility(self: *const Elf64Symbol) u8 {
return self.other & 0x03;
}
};
pub const Elf64Rela = extern struct {
offset: u64 align(1),
info: u64 align(1),
addend: i64 align(1),
pub fn get_symbol(self: *const Elf64Rela) u32 {
return @truncate(self.info >> 32);
}
pub fn get_type(self: *const Elf64Rela) u32 {
return @truncate(self.info & 0xFFFFFFFF);
}
};
pub const LoadedSegment = struct {
virtual_address: u64,
physical_address: u64,
memory_size: u64,
flags: u32,
};
pub const LoadedImage = struct {
entry_point: u64,
base_address: u64,
end_address: u64,
segments: [16]LoadedSegment,
segment_count: usize,
pub fn total_size(self: *const LoadedImage) u64 {
return self.end_address - self.base_address;
}
};
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