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-rw-r--r--vendor/object/src/read/elf/file.rs916
1 files changed, 916 insertions, 0 deletions
diff --git a/vendor/object/src/read/elf/file.rs b/vendor/object/src/read/elf/file.rs
new file mode 100644
index 0000000..14ba568
--- /dev/null
+++ b/vendor/object/src/read/elf/file.rs
@@ -0,0 +1,916 @@
+use alloc::vec::Vec;
+use core::convert::TryInto;
+use core::fmt::Debug;
+use core::mem;
+
+use crate::read::{
+ self, util, Architecture, ByteString, Bytes, Error, Export, FileFlags, Import, Object,
+ ObjectKind, ReadError, ReadRef, SectionIndex, StringTable, SymbolIndex,
+};
+use crate::{elf, endian, Endian, Endianness, Pod, U32};
+
+use super::{
+ CompressionHeader, Dyn, ElfComdat, ElfComdatIterator, ElfDynamicRelocationIterator, ElfSection,
+ ElfSectionIterator, ElfSegment, ElfSegmentIterator, ElfSymbol, ElfSymbolIterator,
+ ElfSymbolTable, NoteHeader, ProgramHeader, Rel, Rela, RelocationSections, SectionHeader,
+ SectionTable, Sym, SymbolTable,
+};
+
+/// A 32-bit ELF object file.
+///
+/// This is a file that starts with [`elf::FileHeader32`], and corresponds
+/// to [`crate::FileKind::Elf32`].
+pub type ElfFile32<'data, Endian = Endianness, R = &'data [u8]> =
+ ElfFile<'data, elf::FileHeader32<Endian>, R>;
+/// A 64-bit ELF object file.
+///
+/// This is a file that starts with [`elf::FileHeader64`], and corresponds
+/// to [`crate::FileKind::Elf64`].
+pub type ElfFile64<'data, Endian = Endianness, R = &'data [u8]> =
+ ElfFile<'data, elf::FileHeader64<Endian>, R>;
+
+/// A partially parsed ELF file.
+///
+/// Most functionality is provided by the [`Object`] trait implementation.
+#[derive(Debug)]
+pub struct ElfFile<'data, Elf, R = &'data [u8]>
+where
+ Elf: FileHeader,
+ R: ReadRef<'data>,
+{
+ pub(super) endian: Elf::Endian,
+ pub(super) data: R,
+ pub(super) header: &'data Elf,
+ pub(super) segments: &'data [Elf::ProgramHeader],
+ pub(super) sections: SectionTable<'data, Elf, R>,
+ pub(super) relocations: RelocationSections,
+ pub(super) symbols: SymbolTable<'data, Elf, R>,
+ pub(super) dynamic_symbols: SymbolTable<'data, Elf, R>,
+}
+
+impl<'data, Elf, R> ElfFile<'data, Elf, R>
+where
+ Elf: FileHeader,
+ R: ReadRef<'data>,
+{
+ /// Parse the raw ELF file data.
+ pub fn parse(data: R) -> read::Result<Self> {
+ let header = Elf::parse(data)?;
+ let endian = header.endian()?;
+ let segments = header.program_headers(endian, data)?;
+ let sections = header.sections(endian, data)?;
+ let symbols = sections.symbols(endian, data, elf::SHT_SYMTAB)?;
+ // TODO: get dynamic symbols from DT_SYMTAB if there are no sections
+ let dynamic_symbols = sections.symbols(endian, data, elf::SHT_DYNSYM)?;
+ // The API we provide requires a mapping from section to relocations, so build it now.
+ let relocations = sections.relocation_sections(endian, symbols.section())?;
+
+ Ok(ElfFile {
+ endian,
+ data,
+ header,
+ segments,
+ sections,
+ relocations,
+ symbols,
+ dynamic_symbols,
+ })
+ }
+
+ /// Returns the endianness.
+ pub fn endian(&self) -> Elf::Endian {
+ self.endian
+ }
+
+ /// Returns the raw data.
+ pub fn data(&self) -> R {
+ self.data
+ }
+
+ /// Returns the raw ELF file header.
+ pub fn raw_header(&self) -> &'data Elf {
+ self.header
+ }
+
+ /// Returns the raw ELF segments.
+ pub fn raw_segments(&self) -> &'data [Elf::ProgramHeader] {
+ self.segments
+ }
+
+ fn raw_section_by_name<'file>(
+ &'file self,
+ section_name: &[u8],
+ ) -> Option<ElfSection<'data, 'file, Elf, R>> {
+ self.sections
+ .section_by_name(self.endian, section_name)
+ .map(|(index, section)| ElfSection {
+ file: self,
+ index: SectionIndex(index),
+ section,
+ })
+ }
+
+ #[cfg(feature = "compression")]
+ fn zdebug_section_by_name<'file>(
+ &'file self,
+ section_name: &[u8],
+ ) -> Option<ElfSection<'data, 'file, Elf, R>> {
+ if !section_name.starts_with(b".debug_") {
+ return None;
+ }
+ let mut name = Vec::with_capacity(section_name.len() + 1);
+ name.extend_from_slice(b".zdebug_");
+ name.extend_from_slice(&section_name[7..]);
+ self.raw_section_by_name(&name)
+ }
+
+ #[cfg(not(feature = "compression"))]
+ fn zdebug_section_by_name<'file>(
+ &'file self,
+ _section_name: &[u8],
+ ) -> Option<ElfSection<'data, 'file, Elf, R>> {
+ None
+ }
+}
+
+impl<'data, Elf, R> read::private::Sealed for ElfFile<'data, Elf, R>
+where
+ Elf: FileHeader,
+ R: ReadRef<'data>,
+{
+}
+
+impl<'data, 'file, Elf, R> Object<'data, 'file> for ElfFile<'data, Elf, R>
+where
+ 'data: 'file,
+ Elf: FileHeader,
+ R: 'file + ReadRef<'data>,
+{
+ type Segment = ElfSegment<'data, 'file, Elf, R>;
+ type SegmentIterator = ElfSegmentIterator<'data, 'file, Elf, R>;
+ type Section = ElfSection<'data, 'file, Elf, R>;
+ type SectionIterator = ElfSectionIterator<'data, 'file, Elf, R>;
+ type Comdat = ElfComdat<'data, 'file, Elf, R>;
+ type ComdatIterator = ElfComdatIterator<'data, 'file, Elf, R>;
+ type Symbol = ElfSymbol<'data, 'file, Elf, R>;
+ type SymbolIterator = ElfSymbolIterator<'data, 'file, Elf, R>;
+ type SymbolTable = ElfSymbolTable<'data, 'file, Elf, R>;
+ type DynamicRelocationIterator = ElfDynamicRelocationIterator<'data, 'file, Elf, R>;
+
+ fn architecture(&self) -> Architecture {
+ match (
+ self.header.e_machine(self.endian),
+ self.header.is_class_64(),
+ ) {
+ (elf::EM_AARCH64, true) => Architecture::Aarch64,
+ (elf::EM_AARCH64, false) => Architecture::Aarch64_Ilp32,
+ (elf::EM_ARM, _) => Architecture::Arm,
+ (elf::EM_AVR, _) => Architecture::Avr,
+ (elf::EM_BPF, _) => Architecture::Bpf,
+ (elf::EM_CSKY, _) => Architecture::Csky,
+ (elf::EM_386, _) => Architecture::I386,
+ (elf::EM_X86_64, false) => Architecture::X86_64_X32,
+ (elf::EM_X86_64, true) => Architecture::X86_64,
+ (elf::EM_HEXAGON, _) => Architecture::Hexagon,
+ (elf::EM_LOONGARCH, true) => Architecture::LoongArch64,
+ (elf::EM_MIPS, false) => Architecture::Mips,
+ (elf::EM_MIPS, true) => Architecture::Mips64,
+ (elf::EM_MSP430, _) => Architecture::Msp430,
+ (elf::EM_PPC, _) => Architecture::PowerPc,
+ (elf::EM_PPC64, _) => Architecture::PowerPc64,
+ (elf::EM_RISCV, false) => Architecture::Riscv32,
+ (elf::EM_RISCV, true) => Architecture::Riscv64,
+ // This is either s390 or s390x, depending on the ELF class.
+ // We only support the 64-bit variant s390x here.
+ (elf::EM_S390, true) => Architecture::S390x,
+ (elf::EM_SBF, _) => Architecture::Sbf,
+ (elf::EM_SHARC, false) => Architecture::Sharc,
+ (elf::EM_SPARCV9, true) => Architecture::Sparc64,
+ (elf::EM_XTENSA, false) => Architecture::Xtensa,
+ _ => Architecture::Unknown,
+ }
+ }
+
+ #[inline]
+ fn is_little_endian(&self) -> bool {
+ self.header.is_little_endian()
+ }
+
+ #[inline]
+ fn is_64(&self) -> bool {
+ self.header.is_class_64()
+ }
+
+ fn kind(&self) -> ObjectKind {
+ match self.header.e_type(self.endian) {
+ elf::ET_REL => ObjectKind::Relocatable,
+ elf::ET_EXEC => ObjectKind::Executable,
+ // TODO: check for `DF_1_PIE`?
+ elf::ET_DYN => ObjectKind::Dynamic,
+ elf::ET_CORE => ObjectKind::Core,
+ _ => ObjectKind::Unknown,
+ }
+ }
+
+ fn segments(&'file self) -> ElfSegmentIterator<'data, 'file, Elf, R> {
+ ElfSegmentIterator {
+ file: self,
+ iter: self.segments.iter(),
+ }
+ }
+
+ fn section_by_name_bytes(
+ &'file self,
+ section_name: &[u8],
+ ) -> Option<ElfSection<'data, 'file, Elf, R>> {
+ self.raw_section_by_name(section_name)
+ .or_else(|| self.zdebug_section_by_name(section_name))
+ }
+
+ fn section_by_index(
+ &'file self,
+ index: SectionIndex,
+ ) -> read::Result<ElfSection<'data, 'file, Elf, R>> {
+ let section = self.sections.section(index)?;
+ Ok(ElfSection {
+ file: self,
+ index,
+ section,
+ })
+ }
+
+ fn sections(&'file self) -> ElfSectionIterator<'data, 'file, Elf, R> {
+ ElfSectionIterator {
+ file: self,
+ iter: self.sections.iter().enumerate(),
+ }
+ }
+
+ fn comdats(&'file self) -> ElfComdatIterator<'data, 'file, Elf, R> {
+ ElfComdatIterator {
+ file: self,
+ iter: self.sections.iter().enumerate(),
+ }
+ }
+
+ fn symbol_by_index(
+ &'file self,
+ index: SymbolIndex,
+ ) -> read::Result<ElfSymbol<'data, 'file, Elf, R>> {
+ let symbol = self.symbols.symbol(index.0)?;
+ Ok(ElfSymbol {
+ endian: self.endian,
+ symbols: &self.symbols,
+ index,
+ symbol,
+ })
+ }
+
+ fn symbols(&'file self) -> ElfSymbolIterator<'data, 'file, Elf, R> {
+ ElfSymbolIterator {
+ endian: self.endian,
+ symbols: &self.symbols,
+ index: 0,
+ }
+ }
+
+ fn symbol_table(&'file self) -> Option<ElfSymbolTable<'data, 'file, Elf, R>> {
+ if self.symbols.is_empty() {
+ return None;
+ }
+ Some(ElfSymbolTable {
+ endian: self.endian,
+ symbols: &self.symbols,
+ })
+ }
+
+ fn dynamic_symbols(&'file self) -> ElfSymbolIterator<'data, 'file, Elf, R> {
+ ElfSymbolIterator {
+ endian: self.endian,
+ symbols: &self.dynamic_symbols,
+ index: 0,
+ }
+ }
+
+ fn dynamic_symbol_table(&'file self) -> Option<ElfSymbolTable<'data, 'file, Elf, R>> {
+ if self.dynamic_symbols.is_empty() {
+ return None;
+ }
+ Some(ElfSymbolTable {
+ endian: self.endian,
+ symbols: &self.dynamic_symbols,
+ })
+ }
+
+ fn dynamic_relocations(
+ &'file self,
+ ) -> Option<ElfDynamicRelocationIterator<'data, 'file, Elf, R>> {
+ Some(ElfDynamicRelocationIterator {
+ section_index: SectionIndex(1),
+ file: self,
+ relocations: None,
+ })
+ }
+
+ fn imports(&self) -> read::Result<Vec<Import<'data>>> {
+ let mut imports = Vec::new();
+ for symbol in self.dynamic_symbols.iter() {
+ if symbol.is_undefined(self.endian) {
+ let name = symbol.name(self.endian, self.dynamic_symbols.strings())?;
+ if !name.is_empty() {
+ // TODO: use symbol versioning to determine library
+ imports.push(Import {
+ name: ByteString(name),
+ library: ByteString(&[]),
+ });
+ }
+ }
+ }
+ Ok(imports)
+ }
+
+ fn exports(&self) -> read::Result<Vec<Export<'data>>> {
+ let mut exports = Vec::new();
+ for symbol in self.dynamic_symbols.iter() {
+ if symbol.is_definition(self.endian) {
+ let name = symbol.name(self.endian, self.dynamic_symbols.strings())?;
+ let address = symbol.st_value(self.endian).into();
+ exports.push(Export {
+ name: ByteString(name),
+ address,
+ });
+ }
+ }
+ Ok(exports)
+ }
+
+ fn has_debug_symbols(&self) -> bool {
+ for section in self.sections.iter() {
+ if let Ok(name) = self.sections.section_name(self.endian, section) {
+ if name == b".debug_info" || name == b".zdebug_info" {
+ return true;
+ }
+ }
+ }
+ false
+ }
+
+ fn build_id(&self) -> read::Result<Option<&'data [u8]>> {
+ let endian = self.endian;
+ // Use section headers if present, otherwise use program headers.
+ if !self.sections.is_empty() {
+ for section in self.sections.iter() {
+ if let Some(mut notes) = section.notes(endian, self.data)? {
+ while let Some(note) = notes.next()? {
+ if note.name() == elf::ELF_NOTE_GNU
+ && note.n_type(endian) == elf::NT_GNU_BUILD_ID
+ {
+ return Ok(Some(note.desc()));
+ }
+ }
+ }
+ }
+ } else {
+ for segment in self.segments {
+ if let Some(mut notes) = segment.notes(endian, self.data)? {
+ while let Some(note) = notes.next()? {
+ if note.name() == elf::ELF_NOTE_GNU
+ && note.n_type(endian) == elf::NT_GNU_BUILD_ID
+ {
+ return Ok(Some(note.desc()));
+ }
+ }
+ }
+ }
+ }
+ Ok(None)
+ }
+
+ fn gnu_debuglink(&self) -> read::Result<Option<(&'data [u8], u32)>> {
+ let section = match self.raw_section_by_name(b".gnu_debuglink") {
+ Some(section) => section,
+ None => return Ok(None),
+ };
+ let data = section
+ .section
+ .data(self.endian, self.data)
+ .read_error("Invalid ELF .gnu_debuglink section offset or size")
+ .map(Bytes)?;
+ let filename = data
+ .read_string_at(0)
+ .read_error("Missing ELF .gnu_debuglink filename")?;
+ let crc_offset = util::align(filename.len() + 1, 4);
+ let crc = data
+ .read_at::<U32<_>>(crc_offset)
+ .read_error("Missing ELF .gnu_debuglink crc")?
+ .get(self.endian);
+ Ok(Some((filename, crc)))
+ }
+
+ fn gnu_debugaltlink(&self) -> read::Result<Option<(&'data [u8], &'data [u8])>> {
+ let section = match self.raw_section_by_name(b".gnu_debugaltlink") {
+ Some(section) => section,
+ None => return Ok(None),
+ };
+ let mut data = section
+ .section
+ .data(self.endian, self.data)
+ .read_error("Invalid ELF .gnu_debugaltlink section offset or size")
+ .map(Bytes)?;
+ let filename = data
+ .read_string()
+ .read_error("Missing ELF .gnu_debugaltlink filename")?;
+ let build_id = data.0;
+ Ok(Some((filename, build_id)))
+ }
+
+ fn relative_address_base(&self) -> u64 {
+ 0
+ }
+
+ fn entry(&self) -> u64 {
+ self.header.e_entry(self.endian).into()
+ }
+
+ fn flags(&self) -> FileFlags {
+ FileFlags::Elf {
+ os_abi: self.header.e_ident().os_abi,
+ abi_version: self.header.e_ident().abi_version,
+ e_flags: self.header.e_flags(self.endian),
+ }
+ }
+}
+
+/// A trait for generic access to [`elf::FileHeader32`] and [`elf::FileHeader64`].
+#[allow(missing_docs)]
+pub trait FileHeader: Debug + Pod {
+ // Ideally this would be a `u64: From<Word>`, but can't express that.
+ type Word: Into<u64>;
+ type Sword: Into<i64>;
+ type Endian: endian::Endian;
+ type ProgramHeader: ProgramHeader<Elf = Self, Endian = Self::Endian, Word = Self::Word>;
+ type SectionHeader: SectionHeader<Elf = Self, Endian = Self::Endian, Word = Self::Word>;
+ type CompressionHeader: CompressionHeader<Endian = Self::Endian, Word = Self::Word>;
+ type NoteHeader: NoteHeader<Endian = Self::Endian>;
+ type Dyn: Dyn<Endian = Self::Endian, Word = Self::Word>;
+ type Sym: Sym<Endian = Self::Endian, Word = Self::Word>;
+ type Rel: Rel<Endian = Self::Endian, Word = Self::Word>;
+ type Rela: Rela<Endian = Self::Endian, Word = Self::Word> + From<Self::Rel>;
+
+ /// Return true if this type is a 64-bit header.
+ ///
+ /// This is a property of the type, not a value in the header data.
+ fn is_type_64(&self) -> bool;
+
+ /// Return true if this type is a 64-bit header.
+ ///
+ /// This is a property of the type, not a value in the header data.
+ ///
+ /// This is the same as [`Self::is_type_64`], but is non-dispatchable.
+ fn is_type_64_sized() -> bool
+ where
+ Self: Sized;
+
+ fn e_ident(&self) -> &elf::Ident;
+ fn e_type(&self, endian: Self::Endian) -> u16;
+ fn e_machine(&self, endian: Self::Endian) -> u16;
+ fn e_version(&self, endian: Self::Endian) -> u32;
+ fn e_entry(&self, endian: Self::Endian) -> Self::Word;
+ fn e_phoff(&self, endian: Self::Endian) -> Self::Word;
+ fn e_shoff(&self, endian: Self::Endian) -> Self::Word;
+ fn e_flags(&self, endian: Self::Endian) -> u32;
+ fn e_ehsize(&self, endian: Self::Endian) -> u16;
+ fn e_phentsize(&self, endian: Self::Endian) -> u16;
+ fn e_phnum(&self, endian: Self::Endian) -> u16;
+ fn e_shentsize(&self, endian: Self::Endian) -> u16;
+ fn e_shnum(&self, endian: Self::Endian) -> u16;
+ fn e_shstrndx(&self, endian: Self::Endian) -> u16;
+
+ // Provided methods.
+
+ /// Read the file header.
+ ///
+ /// Also checks that the ident field in the file header is a supported format.
+ fn parse<'data, R: ReadRef<'data>>(data: R) -> read::Result<&'data Self> {
+ let header = data
+ .read_at::<Self>(0)
+ .read_error("Invalid ELF header size or alignment")?;
+ if !header.is_supported() {
+ return Err(Error("Unsupported ELF header"));
+ }
+ // TODO: Check self.e_ehsize?
+ Ok(header)
+ }
+
+ /// Check that the ident field in the file header is a supported format.
+ ///
+ /// This checks the magic number, version, class, and endianness.
+ fn is_supported(&self) -> bool {
+ let ident = self.e_ident();
+ // TODO: Check self.e_version too? Requires endian though.
+ ident.magic == elf::ELFMAG
+ && (self.is_type_64() || self.is_class_32())
+ && (!self.is_type_64() || self.is_class_64())
+ && (self.is_little_endian() || self.is_big_endian())
+ && ident.version == elf::EV_CURRENT
+ }
+
+ fn is_class_32(&self) -> bool {
+ self.e_ident().class == elf::ELFCLASS32
+ }
+
+ fn is_class_64(&self) -> bool {
+ self.e_ident().class == elf::ELFCLASS64
+ }
+
+ fn is_little_endian(&self) -> bool {
+ self.e_ident().data == elf::ELFDATA2LSB
+ }
+
+ fn is_big_endian(&self) -> bool {
+ self.e_ident().data == elf::ELFDATA2MSB
+ }
+
+ fn endian(&self) -> read::Result<Self::Endian> {
+ Self::Endian::from_big_endian(self.is_big_endian()).read_error("Unsupported ELF endian")
+ }
+
+ /// Return the first section header, if present.
+ ///
+ /// Section 0 is a special case because getting the section headers normally
+ /// requires `shnum`, but `shnum` may be in the first section header.
+ fn section_0<'data, R: ReadRef<'data>>(
+ &self,
+ endian: Self::Endian,
+ data: R,
+ ) -> read::Result<Option<&'data Self::SectionHeader>> {
+ let shoff: u64 = self.e_shoff(endian).into();
+ if shoff == 0 {
+ // No section headers is ok.
+ return Ok(None);
+ }
+ let shentsize = usize::from(self.e_shentsize(endian));
+ if shentsize != mem::size_of::<Self::SectionHeader>() {
+ // Section header size must match.
+ return Err(Error("Invalid ELF section header entry size"));
+ }
+ data.read_at(shoff)
+ .map(Some)
+ .read_error("Invalid ELF section header offset or size")
+ }
+
+ /// Return the `e_phnum` field of the header. Handles extended values.
+ ///
+ /// Returns `Err` for invalid values.
+ fn phnum<'data, R: ReadRef<'data>>(
+ &self,
+ endian: Self::Endian,
+ data: R,
+ ) -> read::Result<usize> {
+ let e_phnum = self.e_phnum(endian);
+ if e_phnum < elf::PN_XNUM {
+ Ok(e_phnum as usize)
+ } else if let Some(section_0) = self.section_0(endian, data)? {
+ Ok(section_0.sh_info(endian) as usize)
+ } else {
+ // Section 0 must exist if e_phnum overflows.
+ Err(Error("Missing ELF section headers for e_phnum overflow"))
+ }
+ }
+
+ /// Return the `e_shnum` field of the header. Handles extended values.
+ ///
+ /// Returns `Err` for invalid values.
+ fn shnum<'data, R: ReadRef<'data>>(
+ &self,
+ endian: Self::Endian,
+ data: R,
+ ) -> read::Result<usize> {
+ let e_shnum = self.e_shnum(endian);
+ if e_shnum > 0 {
+ Ok(e_shnum as usize)
+ } else if let Some(section_0) = self.section_0(endian, data)? {
+ section_0
+ .sh_size(endian)
+ .into()
+ .try_into()
+ .ok()
+ .read_error("Invalid ELF extended e_shnum")
+ } else {
+ // No section headers is ok.
+ Ok(0)
+ }
+ }
+
+ /// Return the `e_shstrndx` field of the header. Handles extended values.
+ ///
+ /// Returns `Err` for invalid values (including if the index is 0).
+ fn shstrndx<'data, R: ReadRef<'data>>(
+ &self,
+ endian: Self::Endian,
+ data: R,
+ ) -> read::Result<u32> {
+ let e_shstrndx = self.e_shstrndx(endian);
+ let index = if e_shstrndx != elf::SHN_XINDEX {
+ e_shstrndx.into()
+ } else if let Some(section_0) = self.section_0(endian, data)? {
+ section_0.sh_link(endian)
+ } else {
+ // Section 0 must exist if we're trying to read e_shstrndx.
+ return Err(Error("Missing ELF section headers for e_shstrndx overflow"));
+ };
+ if index == 0 {
+ return Err(Error("Missing ELF e_shstrndx"));
+ }
+ Ok(index)
+ }
+
+ /// Return the slice of program headers.
+ ///
+ /// Returns `Ok(&[])` if there are no program headers.
+ /// Returns `Err` for invalid values.
+ fn program_headers<'data, R: ReadRef<'data>>(
+ &self,
+ endian: Self::Endian,
+ data: R,
+ ) -> read::Result<&'data [Self::ProgramHeader]> {
+ let phoff: u64 = self.e_phoff(endian).into();
+ if phoff == 0 {
+ // No program headers is ok.
+ return Ok(&[]);
+ }
+ let phnum = self.phnum(endian, data)?;
+ if phnum == 0 {
+ // No program headers is ok.
+ return Ok(&[]);
+ }
+ let phentsize = self.e_phentsize(endian) as usize;
+ if phentsize != mem::size_of::<Self::ProgramHeader>() {
+ // Program header size must match.
+ return Err(Error("Invalid ELF program header entry size"));
+ }
+ data.read_slice_at(phoff, phnum)
+ .read_error("Invalid ELF program header size or alignment")
+ }
+
+ /// Return the slice of section headers.
+ ///
+ /// Returns `Ok(&[])` if there are no section headers.
+ /// Returns `Err` for invalid values.
+ fn section_headers<'data, R: ReadRef<'data>>(
+ &self,
+ endian: Self::Endian,
+ data: R,
+ ) -> read::Result<&'data [Self::SectionHeader]> {
+ let shoff: u64 = self.e_shoff(endian).into();
+ if shoff == 0 {
+ // No section headers is ok.
+ return Ok(&[]);
+ }
+ let shnum = self.shnum(endian, data)?;
+ if shnum == 0 {
+ // No section headers is ok.
+ return Ok(&[]);
+ }
+ let shentsize = usize::from(self.e_shentsize(endian));
+ if shentsize != mem::size_of::<Self::SectionHeader>() {
+ // Section header size must match.
+ return Err(Error("Invalid ELF section header entry size"));
+ }
+ data.read_slice_at(shoff, shnum)
+ .read_error("Invalid ELF section header offset/size/alignment")
+ }
+
+ /// Return the string table for the section headers.
+ fn section_strings<'data, R: ReadRef<'data>>(
+ &self,
+ endian: Self::Endian,
+ data: R,
+ sections: &[Self::SectionHeader],
+ ) -> read::Result<StringTable<'data, R>> {
+ if sections.is_empty() {
+ return Ok(StringTable::default());
+ }
+ let index = self.shstrndx(endian, data)? as usize;
+ let shstrtab = sections.get(index).read_error("Invalid ELF e_shstrndx")?;
+ let strings = if let Some((shstrtab_offset, shstrtab_size)) = shstrtab.file_range(endian) {
+ let shstrtab_end = shstrtab_offset
+ .checked_add(shstrtab_size)
+ .read_error("Invalid ELF shstrtab size")?;
+ StringTable::new(data, shstrtab_offset, shstrtab_end)
+ } else {
+ StringTable::default()
+ };
+ Ok(strings)
+ }
+
+ /// Return the section table.
+ fn sections<'data, R: ReadRef<'data>>(
+ &self,
+ endian: Self::Endian,
+ data: R,
+ ) -> read::Result<SectionTable<'data, Self, R>> {
+ let sections = self.section_headers(endian, data)?;
+ let strings = self.section_strings(endian, data, sections)?;
+ Ok(SectionTable::new(sections, strings))
+ }
+
+ /// Returns whether this is a mips64el elf file.
+ fn is_mips64el(&self, endian: Self::Endian) -> bool {
+ self.is_class_64() && self.is_little_endian() && self.e_machine(endian) == elf::EM_MIPS
+ }
+}
+
+impl<Endian: endian::Endian> FileHeader for elf::FileHeader32<Endian> {
+ type Word = u32;
+ type Sword = i32;
+ type Endian = Endian;
+ type ProgramHeader = elf::ProgramHeader32<Endian>;
+ type SectionHeader = elf::SectionHeader32<Endian>;
+ type CompressionHeader = elf::CompressionHeader32<Endian>;
+ type NoteHeader = elf::NoteHeader32<Endian>;
+ type Dyn = elf::Dyn32<Endian>;
+ type Sym = elf::Sym32<Endian>;
+ type Rel = elf::Rel32<Endian>;
+ type Rela = elf::Rela32<Endian>;
+
+ #[inline]
+ fn is_type_64(&self) -> bool {
+ false
+ }
+
+ #[inline]
+ fn is_type_64_sized() -> bool
+ where
+ Self: Sized,
+ {
+ false
+ }
+
+ #[inline]
+ fn e_ident(&self) -> &elf::Ident {
+ &self.e_ident
+ }
+
+ #[inline]
+ fn e_type(&self, endian: Self::Endian) -> u16 {
+ self.e_type.get(endian)
+ }
+
+ #[inline]
+ fn e_machine(&self, endian: Self::Endian) -> u16 {
+ self.e_machine.get(endian)
+ }
+
+ #[inline]
+ fn e_version(&self, endian: Self::Endian) -> u32 {
+ self.e_version.get(endian)
+ }
+
+ #[inline]
+ fn e_entry(&self, endian: Self::Endian) -> Self::Word {
+ self.e_entry.get(endian)
+ }
+
+ #[inline]
+ fn e_phoff(&self, endian: Self::Endian) -> Self::Word {
+ self.e_phoff.get(endian)
+ }
+
+ #[inline]
+ fn e_shoff(&self, endian: Self::Endian) -> Self::Word {
+ self.e_shoff.get(endian)
+ }
+
+ #[inline]
+ fn e_flags(&self, endian: Self::Endian) -> u32 {
+ self.e_flags.get(endian)
+ }
+
+ #[inline]
+ fn e_ehsize(&self, endian: Self::Endian) -> u16 {
+ self.e_ehsize.get(endian)
+ }
+
+ #[inline]
+ fn e_phentsize(&self, endian: Self::Endian) -> u16 {
+ self.e_phentsize.get(endian)
+ }
+
+ #[inline]
+ fn e_phnum(&self, endian: Self::Endian) -> u16 {
+ self.e_phnum.get(endian)
+ }
+
+ #[inline]
+ fn e_shentsize(&self, endian: Self::Endian) -> u16 {
+ self.e_shentsize.get(endian)
+ }
+
+ #[inline]
+ fn e_shnum(&self, endian: Self::Endian) -> u16 {
+ self.e_shnum.get(endian)
+ }
+
+ #[inline]
+ fn e_shstrndx(&self, endian: Self::Endian) -> u16 {
+ self.e_shstrndx.get(endian)
+ }
+}
+
+impl<Endian: endian::Endian> FileHeader for elf::FileHeader64<Endian> {
+ type Word = u64;
+ type Sword = i64;
+ type Endian = Endian;
+ type ProgramHeader = elf::ProgramHeader64<Endian>;
+ type SectionHeader = elf::SectionHeader64<Endian>;
+ type CompressionHeader = elf::CompressionHeader64<Endian>;
+ type NoteHeader = elf::NoteHeader32<Endian>;
+ type Dyn = elf::Dyn64<Endian>;
+ type Sym = elf::Sym64<Endian>;
+ type Rel = elf::Rel64<Endian>;
+ type Rela = elf::Rela64<Endian>;
+
+ #[inline]
+ fn is_type_64(&self) -> bool {
+ true
+ }
+
+ #[inline]
+ fn is_type_64_sized() -> bool
+ where
+ Self: Sized,
+ {
+ true
+ }
+
+ #[inline]
+ fn e_ident(&self) -> &elf::Ident {
+ &self.e_ident
+ }
+
+ #[inline]
+ fn e_type(&self, endian: Self::Endian) -> u16 {
+ self.e_type.get(endian)
+ }
+
+ #[inline]
+ fn e_machine(&self, endian: Self::Endian) -> u16 {
+ self.e_machine.get(endian)
+ }
+
+ #[inline]
+ fn e_version(&self, endian: Self::Endian) -> u32 {
+ self.e_version.get(endian)
+ }
+
+ #[inline]
+ fn e_entry(&self, endian: Self::Endian) -> Self::Word {
+ self.e_entry.get(endian)
+ }
+
+ #[inline]
+ fn e_phoff(&self, endian: Self::Endian) -> Self::Word {
+ self.e_phoff.get(endian)
+ }
+
+ #[inline]
+ fn e_shoff(&self, endian: Self::Endian) -> Self::Word {
+ self.e_shoff.get(endian)
+ }
+
+ #[inline]
+ fn e_flags(&self, endian: Self::Endian) -> u32 {
+ self.e_flags.get(endian)
+ }
+
+ #[inline]
+ fn e_ehsize(&self, endian: Self::Endian) -> u16 {
+ self.e_ehsize.get(endian)
+ }
+
+ #[inline]
+ fn e_phentsize(&self, endian: Self::Endian) -> u16 {
+ self.e_phentsize.get(endian)
+ }
+
+ #[inline]
+ fn e_phnum(&self, endian: Self::Endian) -> u16 {
+ self.e_phnum.get(endian)
+ }
+
+ #[inline]
+ fn e_shentsize(&self, endian: Self::Endian) -> u16 {
+ self.e_shentsize.get(endian)
+ }
+
+ #[inline]
+ fn e_shnum(&self, endian: Self::Endian) -> u16 {
+ self.e_shnum.get(endian)
+ }
+
+ #[inline]
+ fn e_shstrndx(&self, endian: Self::Endian) -> u16 {
+ self.e_shstrndx.get(endian)
+ }
+}
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