117 lines
3.2 KiB
Rust
117 lines
3.2 KiB
Rust
use core::convert::TryInto;
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use core::fmt::Debug;
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use crate::elf;
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use crate::endian;
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use crate::pod::Pod;
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use crate::read::{ReadError, Result, StringTable};
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/// A trait for generic access to [`elf::Dyn32`] and [`elf::Dyn64`].
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#[allow(missing_docs)]
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pub trait Dyn: Debug + Pod {
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type Word: Into<u64>;
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type Endian: endian::Endian;
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fn d_tag(&self, endian: Self::Endian) -> Self::Word;
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fn d_val(&self, endian: Self::Endian) -> Self::Word;
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/// Try to convert the tag to a `u32`.
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fn tag32(&self, endian: Self::Endian) -> Option<u32> {
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self.d_tag(endian).into().try_into().ok()
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}
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/// Try to convert the value to a `u32`.
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fn val32(&self, endian: Self::Endian) -> Option<u32> {
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self.d_val(endian).into().try_into().ok()
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}
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/// Return true if the value is an offset in the dynamic string table.
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fn is_string(&self, endian: Self::Endian) -> bool {
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if let Some(tag) = self.tag32(endian) {
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match tag {
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elf::DT_NEEDED
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| elf::DT_SONAME
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| elf::DT_RPATH
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| elf::DT_RUNPATH
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| elf::DT_AUXILIARY
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| elf::DT_FILTER => true,
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_ => false,
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}
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} else {
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false
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}
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}
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/// Use the value to get a string in a string table.
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///
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/// Does not check for an appropriate tag.
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fn string<'data>(
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&self,
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endian: Self::Endian,
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strings: StringTable<'data>,
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) -> Result<&'data [u8]> {
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self.val32(endian)
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.and_then(|val| strings.get(val).ok())
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.read_error("Invalid ELF dyn string")
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}
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/// Return true if the value is an address.
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fn is_address(&self, endian: Self::Endian) -> bool {
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if let Some(tag) = self.tag32(endian) {
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match tag {
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elf::DT_PLTGOT
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| elf::DT_HASH
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| elf::DT_STRTAB
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| elf::DT_SYMTAB
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| elf::DT_RELA
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| elf::DT_INIT
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| elf::DT_FINI
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| elf::DT_SYMBOLIC
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| elf::DT_REL
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| elf::DT_DEBUG
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| elf::DT_JMPREL
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| elf::DT_FINI_ARRAY
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| elf::DT_INIT_ARRAY
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| elf::DT_PREINIT_ARRAY
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| elf::DT_SYMTAB_SHNDX
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| elf::DT_VERDEF
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| elf::DT_VERNEED
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| elf::DT_VERSYM
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| elf::DT_ADDRRNGLO..=elf::DT_ADDRRNGHI => true,
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_ => false,
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}
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} else {
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false
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}
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}
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}
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impl<Endian: endian::Endian> Dyn for elf::Dyn32<Endian> {
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type Word = u32;
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type Endian = Endian;
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#[inline]
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fn d_tag(&self, endian: Self::Endian) -> Self::Word {
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self.d_tag.get(endian)
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}
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#[inline]
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fn d_val(&self, endian: Self::Endian) -> Self::Word {
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self.d_val.get(endian)
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}
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}
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impl<Endian: endian::Endian> Dyn for elf::Dyn64<Endian> {
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type Word = u64;
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type Endian = Endian;
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#[inline]
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fn d_tag(&self, endian: Self::Endian) -> Self::Word {
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self.d_tag.get(endian)
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}
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#[inline]
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fn d_val(&self, endian: Self::Endian) -> Self::Word {
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self.d_val.get(endian)
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}
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}
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