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|
// basic ELF types and constants
use std::{io, mem};
// executable type
pub const ET_REL: u16 = 1;
pub const ET_EXEC: u16 = 2;
// segment type
pub const PT_LOAD: u32 = 1;
// segment flags
pub const PF_X: u32 = 1 << 0;
pub const PF_W: u32 = 1 << 1;
pub const PF_R: u32 = 1 << 2;
pub const DT_NEEDED: u32 = 1;
pub const DT_HASH: u32 = 4;
pub const DT_STRTAB: u32 = 5;
pub const DT_SYMTAB: u32 = 6;
pub const DT_STRSZ: u32 = 10;
pub const DT_SYMENT: u32 = 11;
pub const DT_REL: u32 = 17;
pub const DT_RELSZ: u32 = 18;
pub const DT_RELENT: u32 = 19;
pub const PT_DYNAMIC: u32 = 2;
pub const PT_INTERP: u32 = 3;
#[allow(unused)]
pub const SHT_PROGBITS: u32 = 1; // Program data
#[allow(unused)]
pub const SHT_SYMTAB: u32 = 2; // Symbol table
#[allow(unused)]
pub const SHT_STRTAB: u32 = 3; // String table
#[allow(unused)]
pub const SHT_RELA: u32 = 4; // Relocation entries with addends
#[allow(unused)]
pub const SHT_HASH: u32 = 5; // Symbol hash table
#[allow(unused)]
pub const SHT_DYNAMIC: u32 = 6; // Dynamic linking information
#[allow(unused)]
pub const SHT_NOTE: u32 = 7; // Notes
#[allow(unused)]
pub const SHT_NOBITS: u32 = 8; // Program space with no data (bss)
#[allow(unused)]
pub const SHT_REL: u32 = 9; // Relocation entries, no addends
// symbol type
pub const STT_OBJECT: u8 = 1;
pub const STT_FUNC: u8 = 2;
// symbol bind
pub const STB_LOCAL: u8 = 0;
pub const STB_GLOBAL: u8 = 1;
pub const STB_WEAK: u8 = 2;
// section number (for relocations)
pub const SHN_UNDEF: u16 = 0;
pub const SHN_ABS: u16 = 0xfff1;
pub const SHN_COMMON: u16 = 0xfff2;
#[repr(C)]
pub struct Ehdr32 {
pub ident: [u8; 4],
pub class: u8,
pub data: u8,
pub version: u8,
pub abi: u8,
pub abiversion: u8,
pub pad: [u8; 7],
pub r#type: u16,
pub machine: u16,
pub version2: u32,
pub entry: u32,
pub phoff: u32,
pub shoff: u32,
pub flags: u32,
pub ehsize: u16,
pub phentsize: u16,
pub phnum: u16,
pub shentsize: u16,
pub shnum: u16,
pub shstrndx: u16,
}
impl Default for Ehdr32 {
fn default() -> Self {
Self {
ident: [0x7F, b'E', b'L', b'F'],
class: 1,
data: 1,
version: 1,
abi: 0,
abiversion: 0,
pad: [0; 7],
r#type: ET_EXEC,
machine: 3,
version2: 1,
entry: 0,
phoff: 0,
shoff: 0,
flags: 0,
ehsize: mem::size_of::<Self>() as _,
phentsize: mem::size_of::<Phdr32>() as _,
phnum: 0,
shentsize: mem::size_of::<Shdr32>() as _,
shnum: 0,
shstrndx: 0,
}
}
}
impl Ehdr32 {
pub fn offsetof_entry(&self) -> usize {
0x18
}
pub fn section_offset(&self, ndx: u16) -> u64 {
ndx as u64 * self.shentsize as u64 + self.shoff as u64
}
pub fn section_seek(&self, ndx: u16) -> io::SeekFrom {
io::SeekFrom::Start(self.section_offset(ndx))
}
pub fn to_bytes(self) -> [u8; 0x34] {
unsafe { mem::transmute(self) }
}
}
#[repr(C)]
#[derive(Clone)]
pub struct Shdr32 {
pub name: u32,
pub r#type: u32,
pub flags: u32,
pub addr: u32,
pub offset: u32,
pub size: u32,
pub link: u32,
pub info: u32,
pub addralign: u32,
pub entsize: u32,
}
#[repr(C)]
pub struct Phdr32 {
pub r#type: u32,
pub offset: u32,
pub vaddr: u32,
pub paddr: u32,
pub filesz: u32,
pub memsz: u32,
pub flags: u32,
pub align: u32,
}
impl Default for Phdr32 {
fn default() -> Self {
Self {
r#type: PT_LOAD,
offset: 0,
vaddr: 0,
paddr: 0,
filesz: 0,
memsz: 0,
flags: 0,
align: 0x1000,
}
}
}
impl Phdr32 {
pub fn to_bytes(self) -> [u8; 0x20] {
unsafe { mem::transmute(self) }
}
}
|
