1 files changed, 786 insertions, 0 deletions
diff --git a/vendor/object/src/read/xcoff/symbol.rs b/vendor/object/src/read/xcoff/symbol.rs
new file mode 100644
index 0000000..72651c3
--- /dev/null
+++ b/vendor/object/src/read/xcoff/symbol.rs
@@ -0,0 +1,786 @@
+use alloc::fmt;
+use core::convert::TryInto;
+use core::fmt::Debug;
+use core::marker::PhantomData;
+use core::str;
+
+use crate::endian::{BigEndian as BE, U32Bytes};
+use crate::pod::{bytes_of, Pod};
+use crate::read::util::StringTable;
+use crate::xcoff;
+
+use crate::read::{
+    self, Bytes, Error, ObjectSymbol, ObjectSymbolTable, ReadError, ReadRef, Result, SectionIndex,
+    SymbolFlags, SymbolIndex, SymbolKind, SymbolScope, SymbolSection,
+};
+
+use super::{FileHeader, XcoffFile};
+
+/// A table of symbol entries in an XCOFF file.
+///
+/// Also includes the string table used for the symbol names.
+///
+/// Returned by [`FileHeader::symbols`].
+#[derive(Debug)]
+pub struct SymbolTable<'data, Xcoff, R = &'data [u8]>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    symbols: &'data [xcoff::SymbolBytes],
+    strings: StringTable<'data, R>,
+    header: PhantomData<Xcoff>,
+}
+
+impl<'data, Xcoff, R> Default for SymbolTable<'data, Xcoff, R>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    fn default() -> Self {
+        Self {
+            symbols: &[],
+            strings: StringTable::default(),
+            header: PhantomData,
+        }
+    }
+}
+
+impl<'data, Xcoff, R> SymbolTable<'data, Xcoff, R>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    /// Parse the symbol table.
+    pub fn parse(header: Xcoff, data: R) -> Result<Self> {
+        let mut offset = header.f_symptr().into();
+        let (symbols, strings) = if offset != 0 {
+            let symbols = data
+                .read_slice(&mut offset, header.f_nsyms() as usize)
+                .read_error("Invalid XCOFF symbol table offset or size")?;
+
+            // Parse the string table.
+            // Note: don't update data when reading length; the length includes itself.
+            let length = data
+                .read_at::<U32Bytes<_>>(offset)
+                .read_error("Missing XCOFF string table")?
+                .get(BE);
+            let str_end = offset
+                .checked_add(length as u64)
+                .read_error("Invalid XCOFF string table length")?;
+            let strings = StringTable::new(data, offset, str_end);
+
+            (symbols, strings)
+        } else {
+            (&[][..], StringTable::default())
+        };
+
+        Ok(SymbolTable {
+            symbols,
+            strings,
+            header: PhantomData,
+        })
+    }
+
+    /// Return the string table used for the symbol names.
+    #[inline]
+    pub fn strings(&self) -> StringTable<'data, R> {
+        self.strings
+    }
+
+    /// Iterate over the symbols.
+    #[inline]
+    pub fn iter<'table>(&'table self) -> SymbolIterator<'data, 'table, Xcoff, R> {
+        SymbolIterator {
+            symbols: self,
+            index: 0,
+        }
+    }
+
+    /// Empty symbol iterator.
+    #[inline]
+    pub(super) fn iter_none<'table>(&'table self) -> SymbolIterator<'data, 'table, Xcoff, R> {
+        SymbolIterator {
+            symbols: self,
+            index: self.symbols.len(),
+        }
+    }
+
+    /// Return the symbol entry at the given index and offset.
+    pub fn get<T: Pod>(&self, index: usize, offset: usize) -> Result<&'data T> {
+        let entry = index
+            .checked_add(offset)
+            .and_then(|x| self.symbols.get(x))
+            .read_error("Invalid XCOFF symbol index")?;
+        let bytes = bytes_of(entry);
+        Bytes(bytes).read().read_error("Invalid XCOFF symbol data")
+    }
+
+    /// Return the symbol at the given index.
+    pub fn symbol(&self, index: usize) -> Result<&'data Xcoff::Symbol> {
+        self.get::<Xcoff::Symbol>(index, 0)
+    }
+
+    /// Return a file auxiliary symbol.
+    pub fn aux_file(&self, index: usize, offset: usize) -> Result<&'data Xcoff::FileAux> {
+        debug_assert!(self.symbol(index)?.has_aux_file());
+        let aux_file = self.get::<Xcoff::FileAux>(index, offset)?;
+        if let Some(aux_type) = aux_file.x_auxtype() {
+            if aux_type != xcoff::AUX_FILE {
+                return Err(Error("Invalid index for file auxiliary symbol."));
+            }
+        }
+        Ok(aux_file)
+    }
+
+    /// Return the csect auxiliary symbol.
+    pub fn aux_csect(&self, index: usize, offset: usize) -> Result<&'data Xcoff::CsectAux> {
+        debug_assert!(self.symbol(index)?.has_aux_csect());
+        let aux_csect = self.get::<Xcoff::CsectAux>(index, offset)?;
+        if let Some(aux_type) = aux_csect.x_auxtype() {
+            if aux_type != xcoff::AUX_CSECT {
+                return Err(Error("Invalid index/offset for csect auxiliary symbol."));
+            }
+        }
+        Ok(aux_csect)
+    }
+
+    /// Return true if the symbol table is empty.
+    #[inline]
+    pub fn is_empty(&self) -> bool {
+        self.symbols.is_empty()
+    }
+
+    /// The number of symbol table entries.
+    ///
+    /// This includes auxiliary symbol table entries.
+    #[inline]
+    pub fn len(&self) -> usize {
+        self.symbols.len()
+    }
+}
+
+/// An iterator for symbol entries in an XCOFF file.
+///
+/// Yields the index and symbol structure for each symbol.
+#[derive(Debug)]
+pub struct SymbolIterator<'data, 'table, Xcoff, R = &'data [u8]>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    symbols: &'table SymbolTable<'data, Xcoff, R>,
+    index: usize,
+}
+
+impl<'data, 'table, Xcoff: FileHeader, R: ReadRef<'data>> Iterator
+    for SymbolIterator<'data, 'table, Xcoff, R>
+{
+    type Item = (SymbolIndex, &'data Xcoff::Symbol);
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let index = self.index;
+        let symbol = self.symbols.symbol(index).ok()?;
+        self.index += 1 + symbol.n_numaux() as usize;
+        Some((SymbolIndex(index), symbol))
+    }
+}
+
+/// A symbol table in an [`XcoffFile32`](super::XcoffFile32).
+pub type XcoffSymbolTable32<'data, 'file, R = &'data [u8]> =
+    XcoffSymbolTable<'data, 'file, xcoff::FileHeader32, R>;
+/// A symbol table in an [`XcoffFile64`](super::XcoffFile64).
+pub type XcoffSymbolTable64<'data, 'file, R = &'data [u8]> =
+    XcoffSymbolTable<'data, 'file, xcoff::FileHeader64, R>;
+
+/// A symbol table in an [`XcoffFile`].
+#[derive(Debug, Clone, Copy)]
+pub struct XcoffSymbolTable<'data, 'file, Xcoff, R = &'data [u8]>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    pub(super) file: &'file XcoffFile<'data, Xcoff, R>,
+    pub(super) symbols: &'file SymbolTable<'data, Xcoff, R>,
+}
+
+impl<'data, 'file, Xcoff: FileHeader, R: ReadRef<'data>> read::private::Sealed
+    for XcoffSymbolTable<'data, 'file, Xcoff, R>
+{
+}
+
+impl<'data, 'file, Xcoff: FileHeader, R: ReadRef<'data>> ObjectSymbolTable<'data>
+    for XcoffSymbolTable<'data, 'file, Xcoff, R>
+{
+    type Symbol = XcoffSymbol<'data, 'file, Xcoff, R>;
+    type SymbolIterator = XcoffSymbolIterator<'data, 'file, Xcoff, R>;
+
+    fn symbols(&self) -> Self::SymbolIterator {
+        XcoffSymbolIterator {
+            file: self.file,
+            symbols: self.symbols.iter(),
+        }
+    }
+
+    fn symbol_by_index(&self, index: SymbolIndex) -> read::Result<Self::Symbol> {
+        let symbol = self.symbols.symbol(index.0)?;
+        Ok(XcoffSymbol {
+            file: self.file,
+            symbols: self.symbols,
+            index,
+            symbol,
+        })
+    }
+}
+
+/// An iterator for the symbols in an [`XcoffFile32`](super::XcoffFile32).
+pub type XcoffSymbolIterator32<'data, 'file, R = &'data [u8]> =
+    XcoffSymbolIterator<'data, 'file, xcoff::FileHeader32, R>;
+/// An iterator for the symbols in an [`XcoffFile64`](super::XcoffFile64).
+pub type XcoffSymbolIterator64<'data, 'file, R = &'data [u8]> =
+    XcoffSymbolIterator<'data, 'file, xcoff::FileHeader64, R>;
+
+/// An iterator for the symbols in an [`XcoffFile`].
+pub struct XcoffSymbolIterator<'data, 'file, Xcoff, R = &'data [u8]>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    pub(super) file: &'file XcoffFile<'data, Xcoff, R>,
+    pub(super) symbols: SymbolIterator<'data, 'file, Xcoff, R>,
+}
+
+impl<'data, 'file, Xcoff: FileHeader, R: ReadRef<'data>> fmt::Debug
+    for XcoffSymbolIterator<'data, 'file, Xcoff, R>
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("XcoffSymbolIterator").finish()
+    }
+}
+
+impl<'data, 'file, Xcoff: FileHeader, R: ReadRef<'data>> Iterator
+    for XcoffSymbolIterator<'data, 'file, Xcoff, R>
+{
+    type Item = XcoffSymbol<'data, 'file, Xcoff, R>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let (index, symbol) = self.symbols.next()?;
+        Some(XcoffSymbol {
+            file: self.file,
+            symbols: self.symbols.symbols,
+            index,
+            symbol,
+        })
+    }
+}
+
+/// A symbol in an [`XcoffFile32`](super::XcoffFile32).
+pub type XcoffSymbol32<'data, 'file, R = &'data [u8]> =
+    XcoffSymbol<'data, 'file, xcoff::FileHeader32, R>;
+/// A symbol in an [`XcoffFile64`](super::XcoffFile64).
+pub type XcoffSymbol64<'data, 'file, R = &'data [u8]> =
+    XcoffSymbol<'data, 'file, xcoff::FileHeader64, R>;
+
+/// A symbol in an [`XcoffFile`].
+///
+/// Most functionality is provided by the [`ObjectSymbol`] trait implementation.
+#[derive(Debug, Clone, Copy)]
+pub struct XcoffSymbol<'data, 'file, Xcoff, R = &'data [u8]>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    pub(super) file: &'file XcoffFile<'data, Xcoff, R>,
+    pub(super) symbols: &'file SymbolTable<'data, Xcoff, R>,
+    pub(super) index: SymbolIndex,
+    pub(super) symbol: &'data Xcoff::Symbol,
+}
+
+impl<'data, 'file, Xcoff: FileHeader, R: ReadRef<'data>> read::private::Sealed
+    for XcoffSymbol<'data, 'file, Xcoff, R>
+{
+}
+
+impl<'data, 'file, Xcoff: FileHeader, R: ReadRef<'data>> ObjectSymbol<'data>
+    for XcoffSymbol<'data, 'file, Xcoff, R>
+{
+    #[inline]
+    fn index(&self) -> SymbolIndex {
+        self.index
+    }
+
+    fn name_bytes(&self) -> Result<&'data [u8]> {
+        if self.symbol.has_aux_file() {
+            // By convention the file name is in the first auxiliary entry.
+            self.symbols
+                .aux_file(self.index.0, 1)?
+                .fname(self.symbols.strings)
+        } else {
+            self.symbol.name(self.symbols.strings)
+        }
+    }
+
+    fn name(&self) -> Result<&'data str> {
+        let name = self.name_bytes()?;
+        str::from_utf8(name)
+            .ok()
+            .read_error("Non UTF-8 XCOFF symbol name")
+    }
+
+    #[inline]
+    fn address(&self) -> u64 {
+        match self.symbol.n_sclass() {
+            // Relocatable address.
+            xcoff::C_EXT
+            | xcoff::C_WEAKEXT
+            | xcoff::C_HIDEXT
+            | xcoff::C_FCN
+            | xcoff::C_BLOCK
+            | xcoff::C_STAT
+            | xcoff::C_INFO => self.symbol.n_value().into(),
+            _ => 0,
+        }
+    }
+
+    #[inline]
+    fn size(&self) -> u64 {
+        if self.symbol.has_aux_csect() {
+            // XCOFF32 must have the csect auxiliary entry as the last auxiliary entry.
+            // XCOFF64 doesn't require this, but conventionally does.
+            if let Ok(aux_csect) = self
+                .file
+                .symbols
+                .aux_csect(self.index.0, self.symbol.n_numaux() as usize)
+            {
+                let sym_type = aux_csect.sym_type();
+                if sym_type == xcoff::XTY_SD || sym_type == xcoff::XTY_CM {
+                    return aux_csect.x_scnlen();
+                }
+            }
+        }
+        0
+    }
+
+    fn kind(&self) -> SymbolKind {
+        if self.symbol.has_aux_csect() {
+            if let Ok(aux_csect) = self
+                .file
+                .symbols
+                .aux_csect(self.index.0, self.symbol.n_numaux() as usize)
+            {
+                let sym_type = aux_csect.sym_type();
+                if sym_type == xcoff::XTY_SD || sym_type == xcoff::XTY_CM {
+                    return match aux_csect.x_smclas() {
+                        xcoff::XMC_PR | xcoff::XMC_GL => SymbolKind::Text,
+                        xcoff::XMC_RO | xcoff::XMC_RW | xcoff::XMC_TD | xcoff::XMC_BS => {
+                            SymbolKind::Data
+                        }
+                        xcoff::XMC_TL | xcoff::XMC_UL => SymbolKind::Tls,
+                        xcoff::XMC_DS | xcoff::XMC_TC0 | xcoff::XMC_TC => {
+                            // `Metadata` might be a better kind for these if we had it.
+                            SymbolKind::Data
+                        }
+                        _ => SymbolKind::Unknown,
+                    };
+                } else if sym_type == xcoff::XTY_LD {
+                    // A function entry point. Neither `Text` nor `Label` are a good fit for this.
+                    return SymbolKind::Text;
+                } else if sym_type == xcoff::XTY_ER {
+                    return SymbolKind::Unknown;
+                }
+            }
+        }
+        match self.symbol.n_sclass() {
+            xcoff::C_NULL => SymbolKind::Null,
+            xcoff::C_FILE => SymbolKind::File,
+            _ => SymbolKind::Unknown,
+        }
+    }
+
+    fn section(&self) -> SymbolSection {
+        match self.symbol.n_scnum() {
+            xcoff::N_ABS => SymbolSection::Absolute,
+            xcoff::N_UNDEF => SymbolSection::Undefined,
+            xcoff::N_DEBUG => SymbolSection::None,
+            index if index > 0 => SymbolSection::Section(SectionIndex(index as usize)),
+            _ => SymbolSection::Unknown,
+        }
+    }
+
+    #[inline]
+    fn is_undefined(&self) -> bool {
+        self.symbol.is_undefined()
+    }
+
+    /// Return true if the symbol is a definition of a function or data object.
+    #[inline]
+    fn is_definition(&self) -> bool {
+        if self.symbol.n_scnum() <= 0 {
+            return false;
+        }
+        if self.symbol.has_aux_csect() {
+            if let Ok(aux_csect) = self
+                .symbols
+                .aux_csect(self.index.0, self.symbol.n_numaux() as usize)
+            {
+                let sym_type = aux_csect.sym_type();
+                sym_type == xcoff::XTY_SD || sym_type == xcoff::XTY_LD || sym_type == xcoff::XTY_CM
+            } else {
+                false
+            }
+        } else {
+            false
+        }
+    }
+
+    #[inline]
+    fn is_common(&self) -> bool {
+        self.symbol.n_sclass() == xcoff::C_EXT && self.symbol.n_scnum() == xcoff::N_UNDEF
+    }
+
+    #[inline]
+    fn is_weak(&self) -> bool {
+        self.symbol.n_sclass() == xcoff::C_WEAKEXT
+    }
+
+    fn scope(&self) -> SymbolScope {
+        if self.symbol.n_scnum() == xcoff::N_UNDEF {
+            SymbolScope::Unknown
+        } else {
+            match self.symbol.n_sclass() {
+                xcoff::C_EXT | xcoff::C_WEAKEXT => {
+                    let visibility = self.symbol.n_type() & xcoff::SYM_V_MASK;
+                    if visibility == xcoff::SYM_V_HIDDEN {
+                        SymbolScope::Linkage
+                    } else {
+                        SymbolScope::Dynamic
+                    }
+                }
+                _ => SymbolScope::Compilation,
+            }
+        }
+    }
+
+    #[inline]
+    fn is_global(&self) -> bool {
+        match self.symbol.n_sclass() {
+            xcoff::C_EXT | xcoff::C_WEAKEXT => true,
+            _ => false,
+        }
+    }
+
+    #[inline]
+    fn is_local(&self) -> bool {
+        !self.is_global()
+    }
+
+    #[inline]
+    fn flags(&self) -> SymbolFlags<SectionIndex, SymbolIndex> {
+        let mut x_smtyp = 0;
+        let mut x_smclas = 0;
+        let mut containing_csect = None;
+        if self.symbol.has_aux_csect() {
+            if let Ok(aux_csect) = self
+                .file
+                .symbols
+                .aux_csect(self.index.0, self.symbol.n_numaux() as usize)
+            {
+                x_smtyp = aux_csect.x_smtyp();
+                x_smclas = aux_csect.x_smclas();
+                if aux_csect.sym_type() == xcoff::XTY_LD {
+                    containing_csect = Some(SymbolIndex(aux_csect.x_scnlen() as usize))
+                }
+            }
+        }
+        SymbolFlags::Xcoff {
+            n_sclass: self.symbol.n_sclass(),
+            x_smtyp,
+            x_smclas,
+            containing_csect,
+        }
+    }
+}
+
+/// A trait for generic access to [`xcoff::Symbol32`] and [`xcoff::Symbol64`].
+#[allow(missing_docs)]
+pub trait Symbol: Debug + Pod {
+    type Word: Into<u64>;
+
+    fn n_value(&self) -> Self::Word;
+    fn n_scnum(&self) -> i16;
+    fn n_type(&self) -> u16;
+    fn n_sclass(&self) -> u8;
+    fn n_numaux(&self) -> u8;
+
+    fn name_offset(&self) -> Option<u32>;
+    fn name<'data, R: ReadRef<'data>>(
+        &'data self,
+        strings: StringTable<'data, R>,
+    ) -> Result<&'data [u8]>;
+
+    /// Return true if the symbol is undefined.
+    #[inline]
+    fn is_undefined(&self) -> bool {
+        let n_sclass = self.n_sclass();
+        (n_sclass == xcoff::C_EXT || n_sclass == xcoff::C_WEAKEXT)
+            && self.n_scnum() == xcoff::N_UNDEF
+    }
+
+    /// Return true if the symbol has file auxiliary entry.
+    fn has_aux_file(&self) -> bool {
+        self.n_numaux() > 0 && self.n_sclass() == xcoff::C_FILE
+    }
+
+    /// Return true if the symbol has csect auxiliary entry.
+    ///
+    /// A csect auxiliary entry is required for each symbol table entry that has
+    /// a storage class value of C_EXT, C_WEAKEXT, or C_HIDEXT.
+    fn has_aux_csect(&self) -> bool {
+        let sclass = self.n_sclass();
+        self.n_numaux() > 0
+            && (sclass == xcoff::C_EXT || sclass == xcoff::C_WEAKEXT || sclass == xcoff::C_HIDEXT)
+    }
+}
+
+impl Symbol for xcoff::Symbol64 {
+    type Word = u64;
+
+    fn n_value(&self) -> Self::Word {
+        self.n_value.get(BE)
+    }
+
+    fn n_scnum(&self) -> i16 {
+        self.n_scnum.get(BE)
+    }
+
+    fn n_type(&self) -> u16 {
+        self.n_type.get(BE)
+    }
+
+    fn n_sclass(&self) -> u8 {
+        self.n_sclass
+    }
+
+    fn n_numaux(&self) -> u8 {
+        self.n_numaux
+    }
+
+    fn name_offset(&self) -> Option<u32> {
+        Some(self.n_offset.get(BE))
+    }
+
+    /// Parse the symbol name for XCOFF64.
+    fn name<'data, R: ReadRef<'data>>(
+        &'data self,
+        strings: StringTable<'data, R>,
+    ) -> Result<&'data [u8]> {
+        strings
+            .get(self.n_offset.get(BE))
+            .read_error("Invalid XCOFF symbol name offset")
+    }
+}
+
+impl Symbol for xcoff::Symbol32 {
+    type Word = u32;
+
+    fn n_value(&self) -> Self::Word {
+        self.n_value.get(BE)
+    }
+
+    fn n_scnum(&self) -> i16 {
+        self.n_scnum.get(BE)
+    }
+
+    fn n_type(&self) -> u16 {
+        self.n_type.get(BE)
+    }
+
+    fn n_sclass(&self) -> u8 {
+        self.n_sclass
+    }
+
+    fn n_numaux(&self) -> u8 {
+        self.n_numaux
+    }
+
+    fn name_offset(&self) -> Option<u32> {
+        if self.n_name[0] == 0 {
+            let offset = u32::from_be_bytes(self.n_name[4..8].try_into().unwrap());
+            Some(offset)
+        } else {
+            None
+        }
+    }
+
+    /// Parse the symbol name for XCOFF32.
+    fn name<'data, R: ReadRef<'data>>(
+        &'data self,
+        strings: StringTable<'data, R>,
+    ) -> Result<&'data [u8]> {
+        if let Some(offset) = self.name_offset() {
+            // If the name starts with 0 then the last 4 bytes are a string table offset.
+            strings
+                .get(offset)
+                .read_error("Invalid XCOFF symbol name offset")
+        } else {
+            // The name is inline and padded with nulls.
+            Ok(match memchr::memchr(b'\0', &self.n_name) {
+                Some(end) => &self.n_name[..end],
+                None => &self.n_name,
+            })
+        }
+    }
+}
+
+/// A trait for generic access to [`xcoff::FileAux32`] and [`xcoff::FileAux64`].
+#[allow(missing_docs)]
+pub trait FileAux: Debug + Pod {
+    fn x_fname(&self) -> &[u8; 8];
+    fn x_ftype(&self) -> u8;
+    fn x_auxtype(&self) -> Option<u8>;
+
+    fn name_offset(&self) -> Option<u32> {
+        let x_fname = self.x_fname();
+        if x_fname[0] == 0 {
+            Some(u32::from_be_bytes(x_fname[4..8].try_into().unwrap()))
+        } else {
+            None
+        }
+    }
+
+    /// Parse the x_fname field, which may be an inline string or a string table offset.
+    fn fname<'data, R: ReadRef<'data>>(
+        &'data self,
+        strings: StringTable<'data, R>,
+    ) -> Result<&'data [u8]> {
+        if let Some(offset) = self.name_offset() {
+            // If the name starts with 0 then the last 4 bytes are a string table offset.
+            strings
+                .get(offset)
+                .read_error("Invalid XCOFF symbol name offset")
+        } else {
+            // The name is inline and padded with nulls.
+            let x_fname = self.x_fname();
+            Ok(match memchr::memchr(b'\0', x_fname) {
+                Some(end) => &x_fname[..end],
+                None => x_fname,
+            })
+        }
+    }
+}
+
+impl FileAux for xcoff::FileAux64 {
+    fn x_fname(&self) -> &[u8; 8] {
+        &self.x_fname
+    }
+
+    fn x_ftype(&self) -> u8 {
+        self.x_ftype
+    }
+
+    fn x_auxtype(&self) -> Option<u8> {
+        Some(self.x_auxtype)
+    }
+}
+
+impl FileAux for xcoff::FileAux32 {
+    fn x_fname(&self) -> &[u8; 8] {
+        &self.x_fname
+    }
+
+    fn x_ftype(&self) -> u8 {
+        self.x_ftype
+    }
+
+    fn x_auxtype(&self) -> Option<u8> {
+        None
+    }
+}
+
+/// A trait for generic access to [`xcoff::CsectAux32`] and [`xcoff::CsectAux64`].
+#[allow(missing_docs)]
+pub trait CsectAux: Debug + Pod {
+    fn x_scnlen(&self) -> u64;
+    fn x_parmhash(&self) -> u32;
+    fn x_snhash(&self) -> u16;
+    fn x_smtyp(&self) -> u8;
+    fn x_smclas(&self) -> u8;
+    fn x_stab(&self) -> Option<u32>;
+    fn x_snstab(&self) -> Option<u16>;
+    fn x_auxtype(&self) -> Option<u8>;
+
+    fn alignment(&self) -> u8 {
+        self.x_smtyp() >> 3
+    }
+    fn sym_type(&self) -> u8 {
+        self.x_smtyp() & 0x07
+    }
+}
+
+impl CsectAux for xcoff::CsectAux64 {
+    fn x_scnlen(&self) -> u64 {
+        self.x_scnlen_lo.get(BE) as u64 | ((self.x_scnlen_hi.get(BE) as u64) << 32)
+    }
+
+    fn x_parmhash(&self) -> u32 {
+        self.x_parmhash.get(BE)
+    }
+
+    fn x_snhash(&self) -> u16 {
+        self.x_snhash.get(BE)
+    }
+
+    fn x_smtyp(&self) -> u8 {
+        self.x_smtyp
+    }
+
+    fn x_smclas(&self) -> u8 {
+        self.x_smclas
+    }
+
+    fn x_stab(&self) -> Option<u32> {
+        None
+    }
+
+    fn x_snstab(&self) -> Option<u16> {
+        None
+    }
+
+    fn x_auxtype(&self) -> Option<u8> {
+        Some(self.x_auxtype)
+    }
+}
+
+impl CsectAux for xcoff::CsectAux32 {
+    fn x_scnlen(&self) -> u64 {
+        self.x_scnlen.get(BE) as u64
+    }
+
+    fn x_parmhash(&self) -> u32 {
+        self.x_parmhash.get(BE)
+    }
+
+    fn x_snhash(&self) -> u16 {
+        self.x_snhash.get(BE)
+    }
+
+    fn x_smtyp(&self) -> u8 {
+        self.x_smtyp
+    }
+
+    fn x_smclas(&self) -> u8 {
+        self.x_smclas
+    }
+
+    fn x_stab(&self) -> Option<u32> {
+        Some(self.x_stab.get(BE))
+    }
+
+    fn x_snstab(&self) -> Option<u16> {
+        Some(self.x_snstab.get(BE))
+    }
+
+    fn x_auxtype(&self) -> Option<u8> {
+        None
+    }
+}