Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

6 files changed, 3910 insertions, 0 deletions

diff --git a/vendor/object-0.26.2/src/write/coff.rs b/vendor/object-0.26.2/src/write/coff.rs
new file mode 100644
index 000000000..c8516c102
--- /dev/null
+++ b/vendor/object-0.26.2/src/write/coff.rs
@@ -0,0 +1,626 @@
+use std::mem;
+use std::vec::Vec;
+
+use crate::endian::{LittleEndian as LE, U16Bytes, U32Bytes, U16, U32};
+use crate::pe as coff;
+use crate::write::string::*;
+use crate::write::util::*;
+use crate::write::*;
+
+#[derive(Default, Clone, Copy)]
+struct SectionOffsets {
+    offset: usize,
+    str_id: Option<StringId>,
+    reloc_offset: usize,
+    selection: u8,
+    associative_section: u16,
+}
+
+#[derive(Default, Clone, Copy)]
+struct SymbolOffsets {
+    index: usize,
+    str_id: Option<StringId>,
+    aux_count: u8,
+}
+
+impl Object {
+    pub(crate) fn coff_section_info(
+        &self,
+        section: StandardSection,
+    ) -> (&'static [u8], &'static [u8], SectionKind) {
+        match section {
+            StandardSection::Text => (&[], &b".text"[..], SectionKind::Text),
+            StandardSection::Data => (&[], &b".data"[..], SectionKind::Data),
+            StandardSection::ReadOnlyData
+            | StandardSection::ReadOnlyDataWithRel
+            | StandardSection::ReadOnlyString => (&[], &b".rdata"[..], SectionKind::ReadOnlyData),
+            StandardSection::UninitializedData => {
+                (&[], &b".bss"[..], SectionKind::UninitializedData)
+            }
+            // TLS sections are data sections with a special name.
+            StandardSection::Tls => (&[], &b".tls$"[..], SectionKind::Data),
+            StandardSection::UninitializedTls => {
+                // Unsupported section.
+                (&[], &[], SectionKind::UninitializedTls)
+            }
+            StandardSection::TlsVariables => {
+                // Unsupported section.
+                (&[], &[], SectionKind::TlsVariables)
+            }
+            StandardSection::Common => {
+                // Unsupported section.
+                (&[], &[], SectionKind::Common)
+            }
+        }
+    }
+
+    pub(crate) fn coff_subsection_name(&self, section: &[u8], value: &[u8]) -> Vec<u8> {
+        let mut name = section.to_vec();
+        name.push(b'$');
+        name.extend_from_slice(value);
+        name
+    }
+
+    pub(crate) fn coff_fixup_relocation(&mut self, mut relocation: &mut Relocation) -> i64 {
+        if relocation.kind == RelocationKind::GotRelative {
+            // Use a stub symbol for the relocation instead.
+            // This isn't really a GOT, but it's a similar purpose.
+            // TODO: need to handle DLL imports differently?
+            relocation.kind = RelocationKind::Relative;
+            relocation.symbol = self.coff_add_stub_symbol(relocation.symbol);
+        } else if relocation.kind == RelocationKind::PltRelative {
+            // Windows doesn't need a separate relocation type for
+            // references to functions in import libraries.
+            // For convenience, treat this the same as Relative.
+            relocation.kind = RelocationKind::Relative;
+        }
+
+        let constant = match self.architecture {
+            Architecture::I386 => match relocation.kind {
+                RelocationKind::Relative => {
+                    // IMAGE_REL_I386_REL32
+                    relocation.addend + 4
+                }
+                _ => relocation.addend,
+            },
+            Architecture::X86_64 => match relocation.kind {
+                RelocationKind::Relative => {
+                    // IMAGE_REL_AMD64_REL32 through to IMAGE_REL_AMD64_REL32_5
+                    if relocation.addend <= -4 && relocation.addend >= -9 {
+                        0
+                    } else {
+                        relocation.addend + 4
+                    }
+                }
+                _ => relocation.addend,
+            },
+            _ => unimplemented!(),
+        };
+        relocation.addend -= constant;
+        constant
+    }
+
+    fn coff_add_stub_symbol(&mut self, symbol_id: SymbolId) -> SymbolId {
+        if let Some(stub_id) = self.stub_symbols.get(&symbol_id) {
+            return *stub_id;
+        }
+        let stub_size = self.architecture.address_size().unwrap().bytes();
+
+        let mut name = b".rdata$.refptr.".to_vec();
+        name.extend_from_slice(&self.symbols[symbol_id.0].name);
+        let section_id = self.add_section(Vec::new(), name, SectionKind::ReadOnlyData);
+        let section = self.section_mut(section_id);
+        section.set_data(vec![0; stub_size as usize], u64::from(stub_size));
+        section.relocations = vec![Relocation {
+            offset: 0,
+            size: stub_size * 8,
+            kind: RelocationKind::Absolute,
+            encoding: RelocationEncoding::Generic,
+            symbol: symbol_id,
+            addend: 0,
+        }];
+
+        let mut name = b".refptr.".to_vec();
+        name.extend_from_slice(&self.symbol(symbol_id).name);
+        let stub_id = self.add_raw_symbol(Symbol {
+            name,
+            value: 0,
+            size: u64::from(stub_size),
+            kind: SymbolKind::Data,
+            scope: SymbolScope::Compilation,
+            weak: false,
+            section: SymbolSection::Section(section_id),
+            flags: SymbolFlags::None,
+        });
+        self.stub_symbols.insert(symbol_id, stub_id);
+
+        stub_id
+    }
+
+    pub(crate) fn coff_write(&self, buffer: &mut dyn WritableBuffer) -> Result<()> {
+        // Calculate offsets of everything, and build strtab.
+        let mut offset = 0;
+        let mut strtab = StringTable::default();
+
+        // COFF header.
+        offset += mem::size_of::<coff::ImageFileHeader>();
+
+        // Section headers.
+        offset += self.sections.len() * mem::size_of::<coff::ImageSectionHeader>();
+
+        // Calculate size of section data and add section strings to strtab.
+        let mut section_offsets = vec![SectionOffsets::default(); self.sections.len()];
+        for (index, section) in self.sections.iter().enumerate() {
+            if section.name.len() > 8 {
+                section_offsets[index].str_id = Some(strtab.add(&section.name));
+            }
+
+            let len = section.data.len();
+            if len != 0 {
+                // TODO: not sure what alignment is required here, but this seems to match LLVM
+                offset = align(offset, 4);
+                section_offsets[index].offset = offset;
+                offset += len;
+            } else {
+                section_offsets[index].offset = 0;
+            }
+
+            // Calculate size of relocations.
+            let count = section.relocations.len();
+            if count != 0 {
+                section_offsets[index].reloc_offset = offset;
+                offset += count * mem::size_of::<coff::ImageRelocation>();
+            }
+        }
+
+        // Set COMDAT flags.
+        for comdat in &self.comdats {
+            let symbol = &self.symbols[comdat.symbol.0];
+            let comdat_section = match symbol.section {
+                SymbolSection::Section(id) => id.0,
+                _ => {
+                    return Err(Error(format!(
+                        "unsupported COMDAT symbol `{}` section {:?}",
+                        symbol.name().unwrap_or(""),
+                        symbol.section
+                    )));
+                }
+            };
+            section_offsets[comdat_section].selection = match comdat.kind {
+                ComdatKind::NoDuplicates => coff::IMAGE_COMDAT_SELECT_NODUPLICATES,
+                ComdatKind::Any => coff::IMAGE_COMDAT_SELECT_ANY,
+                ComdatKind::SameSize => coff::IMAGE_COMDAT_SELECT_SAME_SIZE,
+                ComdatKind::ExactMatch => coff::IMAGE_COMDAT_SELECT_EXACT_MATCH,
+                ComdatKind::Largest => coff::IMAGE_COMDAT_SELECT_LARGEST,
+                ComdatKind::Newest => coff::IMAGE_COMDAT_SELECT_NEWEST,
+                ComdatKind::Unknown => {
+                    return Err(Error(format!(
+                        "unsupported COMDAT symbol `{}` kind {:?}",
+                        symbol.name().unwrap_or(""),
+                        comdat.kind
+                    )));
+                }
+            };
+            for id in &comdat.sections {
+                let section = &self.sections[id.0];
+                if section.symbol.is_none() {
+                    return Err(Error(format!(
+                        "missing symbol for COMDAT section `{}`",
+                        section.name().unwrap_or(""),
+                    )));
+                }
+                if id.0 != comdat_section {
+                    section_offsets[id.0].selection = coff::IMAGE_COMDAT_SELECT_ASSOCIATIVE;
+                    section_offsets[id.0].associative_section = comdat_section as u16 + 1;
+                }
+            }
+        }
+
+        // Calculate size of symbols and add symbol strings to strtab.
+        let mut symbol_offsets = vec![SymbolOffsets::default(); self.symbols.len()];
+        let mut symtab_count = 0;
+        for (index, symbol) in self.symbols.iter().enumerate() {
+            symbol_offsets[index].index = symtab_count;
+            symtab_count += 1;
+            match symbol.kind {
+                SymbolKind::File => {
+                    // Name goes in auxilary symbol records.
+                    let aux_count = (symbol.name.len() + coff::IMAGE_SIZEOF_SYMBOL - 1)
+                        / coff::IMAGE_SIZEOF_SYMBOL;
+                    symbol_offsets[index].aux_count = aux_count as u8;
+                    symtab_count += aux_count;
+                    // Don't add name to strtab.
+                    continue;
+                }
+                SymbolKind::Section => {
+                    symbol_offsets[index].aux_count = 1;
+                    symtab_count += 1;
+                }
+                _ => {}
+            }
+            if symbol.name.len() > 8 {
+                symbol_offsets[index].str_id = Some(strtab.add(&symbol.name));
+            }
+        }
+
+        // Calculate size of symtab.
+        let symtab_offset = offset;
+        let symtab_len = symtab_count * coff::IMAGE_SIZEOF_SYMBOL;
+        offset += symtab_len;
+
+        // Calculate size of strtab.
+        let strtab_offset = offset;
+        let mut strtab_data = Vec::new();
+        // First 4 bytes of strtab are the length.
+        strtab.write(4, &mut strtab_data);
+        let strtab_len = strtab_data.len() + 4;
+        offset += strtab_len;
+
+        // Start writing.
+        buffer
+            .reserve(offset)
+            .map_err(|_| Error(String::from("Cannot allocate buffer")))?;
+
+        // Write file header.
+        let header = coff::ImageFileHeader {
+            machine: U16::new(
+                LE,
+                match self.architecture {
+                    Architecture::Arm => coff::IMAGE_FILE_MACHINE_ARMNT,
+                    Architecture::Aarch64 => coff::IMAGE_FILE_MACHINE_ARM64,
+                    Architecture::I386 => coff::IMAGE_FILE_MACHINE_I386,
+                    Architecture::X86_64 => coff::IMAGE_FILE_MACHINE_AMD64,
+                    _ => {
+                        return Err(Error(format!(
+                            "unimplemented architecture {:?}",
+                            self.architecture
+                        )));
+                    }
+                },
+            ),
+            number_of_sections: U16::new(LE, self.sections.len() as u16),
+            time_date_stamp: U32::default(),
+            pointer_to_symbol_table: U32::new(LE, symtab_offset as u32),
+            number_of_symbols: U32::new(LE, symtab_count as u32),
+            size_of_optional_header: U16::default(),
+            characteristics: match self.flags {
+                FileFlags::Coff { characteristics } => U16::new(LE, characteristics),
+                _ => U16::default(),
+            },
+        };
+        buffer.write(&header);
+
+        // Write section headers.
+        for (index, section) in self.sections.iter().enumerate() {
+            let mut characteristics = match section.flags {
+                SectionFlags::Coff {
+                    characteristics, ..
+                } => characteristics,
+                _ => 0,
+            };
+            if section_offsets[index].selection != 0 {
+                characteristics |= coff::IMAGE_SCN_LNK_COMDAT;
+            };
+            characteristics |= match section.kind {
+                SectionKind::Text => {
+                    coff::IMAGE_SCN_CNT_CODE
+                        | coff::IMAGE_SCN_MEM_EXECUTE
+                        | coff::IMAGE_SCN_MEM_READ
+                }
+                SectionKind::Data => {
+                    coff::IMAGE_SCN_CNT_INITIALIZED_DATA
+                        | coff::IMAGE_SCN_MEM_READ
+                        | coff::IMAGE_SCN_MEM_WRITE
+                }
+                SectionKind::UninitializedData => {
+                    coff::IMAGE_SCN_CNT_UNINITIALIZED_DATA
+                        | coff::IMAGE_SCN_MEM_READ
+                        | coff::IMAGE_SCN_MEM_WRITE
+                }
+                SectionKind::ReadOnlyData | SectionKind::ReadOnlyString => {
+                    coff::IMAGE_SCN_CNT_INITIALIZED_DATA | coff::IMAGE_SCN_MEM_READ
+                }
+                SectionKind::Debug | SectionKind::Other | SectionKind::OtherString => {
+                    coff::IMAGE_SCN_CNT_INITIALIZED_DATA
+                        | coff::IMAGE_SCN_MEM_READ
+                        | coff::IMAGE_SCN_MEM_DISCARDABLE
+                }
+                SectionKind::Linker => coff::IMAGE_SCN_LNK_INFO | coff::IMAGE_SCN_LNK_REMOVE,
+                SectionKind::Common
+                | SectionKind::Tls
+                | SectionKind::UninitializedTls
+                | SectionKind::TlsVariables
+                | SectionKind::Note
+                | SectionKind::Unknown
+                | SectionKind::Metadata
+                | SectionKind::Elf(_) => {
+                    return Err(Error(format!(
+                        "unimplemented section `{}` kind {:?}",
+                        section.name().unwrap_or(""),
+                        section.kind
+                    )));
+                }
+            } | match section.align {
+                1 => coff::IMAGE_SCN_ALIGN_1BYTES,
+                2 => coff::IMAGE_SCN_ALIGN_2BYTES,
+                4 => coff::IMAGE_SCN_ALIGN_4BYTES,
+                8 => coff::IMAGE_SCN_ALIGN_8BYTES,
+                16 => coff::IMAGE_SCN_ALIGN_16BYTES,
+                32 => coff::IMAGE_SCN_ALIGN_32BYTES,
+                64 => coff::IMAGE_SCN_ALIGN_64BYTES,
+                128 => coff::IMAGE_SCN_ALIGN_128BYTES,
+                256 => coff::IMAGE_SCN_ALIGN_256BYTES,
+                512 => coff::IMAGE_SCN_ALIGN_512BYTES,
+                1024 => coff::IMAGE_SCN_ALIGN_1024BYTES,
+                2048 => coff::IMAGE_SCN_ALIGN_2048BYTES,
+                4096 => coff::IMAGE_SCN_ALIGN_4096BYTES,
+                8192 => coff::IMAGE_SCN_ALIGN_8192BYTES,
+                _ => {
+                    return Err(Error(format!(
+                        "unimplemented section `{}` align {}",
+                        section.name().unwrap_or(""),
+                        section.align
+                    )));
+                }
+            };
+            let mut coff_section = coff::ImageSectionHeader {
+                name: [0; 8],
+                virtual_size: U32::default(),
+                virtual_address: U32::default(),
+                size_of_raw_data: U32::new(LE, section.size as u32),
+                pointer_to_raw_data: U32::new(LE, section_offsets[index].offset as u32),
+                pointer_to_relocations: U32::new(LE, section_offsets[index].reloc_offset as u32),
+                pointer_to_linenumbers: U32::default(),
+                number_of_relocations: U16::new(LE, section.relocations.len() as u16),
+                number_of_linenumbers: U16::default(),
+                characteristics: U32::new(LE, characteristics),
+            };
+            if section.name.len() <= 8 {
+                coff_section.name[..section.name.len()].copy_from_slice(&section.name);
+            } else {
+                let mut str_offset = strtab.get_offset(section_offsets[index].str_id.unwrap());
+                if str_offset <= 9_999_999 {
+                    let mut name = [0; 7];
+                    let mut len = 0;
+                    if str_offset == 0 {
+                        name[6] = b'0';
+                        len = 1;
+                    } else {
+                        while str_offset != 0 {
+                            let rem = (str_offset % 10) as u8;
+                            str_offset /= 10;
+                            name[6 - len] = b'0' + rem;
+                            len += 1;
+                        }
+                    }
+                    coff_section.name = [0; 8];
+                    coff_section.name[0] = b'/';
+                    coff_section.name[1..][..len].copy_from_slice(&name[7 - len..]);
+                } else if str_offset as u64 <= 0xf_ffff_ffff {
+                    coff_section.name[0] = b'/';
+                    coff_section.name[1] = b'/';
+                    for i in 0..6 {
+                        let rem = (str_offset % 64) as u8;
+                        str_offset /= 64;
+                        let c = match rem {
+                            0..=25 => b'A' + rem,
+                            26..=51 => b'a' + rem - 26,
+                            52..=61 => b'0' + rem - 52,
+                            62 => b'+',
+                            63 => b'/',
+                            _ => unreachable!(),
+                        };
+                        coff_section.name[7 - i] = c;
+                    }
+                } else {
+                    return Err(Error(format!("invalid section name offset {}", str_offset)));
+                }
+            }
+            buffer.write(&coff_section);
+        }
+
+        // Write section data and relocations.
+        for (index, section) in self.sections.iter().enumerate() {
+            let len = section.data.len();
+            if len != 0 {
+                write_align(buffer, 4);
+                debug_assert_eq!(section_offsets[index].offset, buffer.len());
+                buffer.write_bytes(&section.data);
+            }
+
+            if !section.relocations.is_empty() {
+                debug_assert_eq!(section_offsets[index].reloc_offset, buffer.len());
+                for reloc in &section.relocations {
+                    //assert!(reloc.implicit_addend);
+                    let typ = match self.architecture {
+                        Architecture::I386 => match (reloc.kind, reloc.size, reloc.addend) {
+                            (RelocationKind::Absolute, 16, 0) => coff::IMAGE_REL_I386_DIR16,
+                            (RelocationKind::Relative, 16, 0) => coff::IMAGE_REL_I386_REL16,
+                            (RelocationKind::Absolute, 32, 0) => coff::IMAGE_REL_I386_DIR32,
+                            (RelocationKind::ImageOffset, 32, 0) => coff::IMAGE_REL_I386_DIR32NB,
+                            (RelocationKind::SectionIndex, 16, 0) => coff::IMAGE_REL_I386_SECTION,
+                            (RelocationKind::SectionOffset, 32, 0) => coff::IMAGE_REL_I386_SECREL,
+                            (RelocationKind::SectionOffset, 7, 0) => coff::IMAGE_REL_I386_SECREL7,
+                            (RelocationKind::Relative, 32, -4) => coff::IMAGE_REL_I386_REL32,
+                            (RelocationKind::Coff(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::X86_64 => match (reloc.kind, reloc.size, reloc.addend) {
+                            (RelocationKind::Absolute, 64, 0) => coff::IMAGE_REL_AMD64_ADDR64,
+                            (RelocationKind::Absolute, 32, 0) => coff::IMAGE_REL_AMD64_ADDR32,
+                            (RelocationKind::ImageOffset, 32, 0) => coff::IMAGE_REL_AMD64_ADDR32NB,
+                            (RelocationKind::Relative, 32, -4) => coff::IMAGE_REL_AMD64_REL32,
+                            (RelocationKind::Relative, 32, -5) => coff::IMAGE_REL_AMD64_REL32_1,
+                            (RelocationKind::Relative, 32, -6) => coff::IMAGE_REL_AMD64_REL32_2,
+                            (RelocationKind::Relative, 32, -7) => coff::IMAGE_REL_AMD64_REL32_3,
+                            (RelocationKind::Relative, 32, -8) => coff::IMAGE_REL_AMD64_REL32_4,
+                            (RelocationKind::Relative, 32, -9) => coff::IMAGE_REL_AMD64_REL32_5,
+                            (RelocationKind::SectionIndex, 16, 0) => coff::IMAGE_REL_AMD64_SECTION,
+                            (RelocationKind::SectionOffset, 32, 0) => coff::IMAGE_REL_AMD64_SECREL,
+                            (RelocationKind::SectionOffset, 7, 0) => coff::IMAGE_REL_AMD64_SECREL7,
+                            (RelocationKind::Coff(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        _ => {
+                            return Err(Error(format!(
+                                "unimplemented architecture {:?}",
+                                self.architecture
+                            )));
+                        }
+                    };
+                    let coff_relocation = coff::ImageRelocation {
+                        virtual_address: U32Bytes::new(LE, reloc.offset as u32),
+                        symbol_table_index: U32Bytes::new(
+                            LE,
+                            symbol_offsets[reloc.symbol.0].index as u32,
+                        ),
+                        typ: U16Bytes::new(LE, typ),
+                    };
+                    buffer.write(&coff_relocation);
+                }
+            }
+        }
+
+        // Write symbols.
+        debug_assert_eq!(symtab_offset, buffer.len());
+        for (index, symbol) in self.symbols.iter().enumerate() {
+            let mut name = &symbol.name[..];
+            let section_number = match symbol.section {
+                SymbolSection::None => {
+                    debug_assert_eq!(symbol.kind, SymbolKind::File);
+                    coff::IMAGE_SYM_DEBUG
+                }
+                SymbolSection::Undefined => coff::IMAGE_SYM_UNDEFINED,
+                SymbolSection::Absolute => coff::IMAGE_SYM_ABSOLUTE,
+                SymbolSection::Common => coff::IMAGE_SYM_UNDEFINED,
+                SymbolSection::Section(id) => id.0 as u16 + 1,
+            };
+            let typ = if symbol.kind == SymbolKind::Text {
+                coff::IMAGE_SYM_DTYPE_FUNCTION << coff::IMAGE_SYM_DTYPE_SHIFT
+            } else {
+                coff::IMAGE_SYM_TYPE_NULL
+            };
+            let storage_class = match symbol.kind {
+                SymbolKind::File => {
+                    // Name goes in auxilary symbol records.
+                    name = b".file";
+                    coff::IMAGE_SYM_CLASS_FILE
+                }
+                SymbolKind::Section => coff::IMAGE_SYM_CLASS_STATIC,
+                SymbolKind::Label => coff::IMAGE_SYM_CLASS_LABEL,
+                SymbolKind::Text | SymbolKind::Data | SymbolKind::Tls => {
+                    match symbol.section {
+                        SymbolSection::None => {
+                            return Err(Error(format!(
+                                "missing section for symbol `{}`",
+                                symbol.name().unwrap_or("")
+                            )));
+                        }
+                        SymbolSection::Undefined | SymbolSection::Common => {
+                            coff::IMAGE_SYM_CLASS_EXTERNAL
+                        }
+                        SymbolSection::Absolute | SymbolSection::Section(_) => {
+                            match symbol.scope {
+                                // TODO: does this need aux symbol records too?
+                                _ if symbol.weak => coff::IMAGE_SYM_CLASS_WEAK_EXTERNAL,
+                                SymbolScope::Unknown => {
+                                    return Err(Error(format!(
+                                        "unimplemented symbol `{}` scope {:?}",
+                                        symbol.name().unwrap_or(""),
+                                        symbol.scope
+                                    )));
+                                }
+                                SymbolScope::Compilation => coff::IMAGE_SYM_CLASS_STATIC,
+                                SymbolScope::Linkage | SymbolScope::Dynamic => {
+                                    coff::IMAGE_SYM_CLASS_EXTERNAL
+                                }
+                            }
+                        }
+                    }
+                }
+                SymbolKind::Unknown | SymbolKind::Null => {
+                    return Err(Error(format!(
+                        "unimplemented symbol `{}` kind {:?}",
+                        symbol.name().unwrap_or(""),
+                        symbol.kind
+                    )));
+                }
+            };
+            let number_of_aux_symbols = symbol_offsets[index].aux_count;
+            let value = if symbol.section == SymbolSection::Common {
+                symbol.size as u32
+            } else {
+                symbol.value as u32
+            };
+            let mut coff_symbol = coff::ImageSymbol {
+                name: [0; 8],
+                value: U32Bytes::new(LE, value),
+                section_number: U16Bytes::new(LE, section_number as u16),
+                typ: U16Bytes::new(LE, typ),
+                storage_class,
+                number_of_aux_symbols,
+            };
+            if name.len() <= 8 {
+                coff_symbol.name[..name.len()].copy_from_slice(name);
+            } else {
+                let str_offset = strtab.get_offset(symbol_offsets[index].str_id.unwrap());
+                coff_symbol.name[4..8].copy_from_slice(&u32::to_le_bytes(str_offset as u32));
+            }
+            buffer.write(&coff_symbol);
+
+            // Write auxiliary symbols.
+            match symbol.kind {
+                SymbolKind::File => {
+                    let aux_len = number_of_aux_symbols as usize * coff::IMAGE_SIZEOF_SYMBOL;
+                    debug_assert!(aux_len >= symbol.name.len());
+                    let old_len = buffer.len();
+                    buffer.write_bytes(&symbol.name);
+                    buffer.resize(old_len + aux_len, 0);
+                }
+                SymbolKind::Section => {
+                    debug_assert_eq!(number_of_aux_symbols, 1);
+                    let section_index = symbol.section.id().unwrap().0;
+                    let section = &self.sections[section_index];
+                    let aux = coff::ImageAuxSymbolSection {
+                        length: U32Bytes::new(LE, section.size as u32),
+                        number_of_relocations: U16Bytes::new(LE, section.relocations.len() as u16),
+                        number_of_linenumbers: U16Bytes::default(),
+                        check_sum: U32Bytes::new(LE, checksum(section.data.as_slice())),
+                        number: U16Bytes::new(
+                            LE,
+                            section_offsets[section_index].associative_section,
+                        ),
+                        selection: section_offsets[section_index].selection,
+                        reserved: 0,
+                        // TODO: bigobj
+                        high_number: U16Bytes::default(),
+                    };
+                    buffer.write(&aux);
+                }
+                _ => {
+                    debug_assert_eq!(number_of_aux_symbols, 0);
+                }
+            }
+        }
+
+        // Write strtab section.
+        debug_assert_eq!(strtab_offset, buffer.len());
+        buffer.write_bytes(&u32::to_le_bytes(strtab_len as u32));
+        buffer.write_bytes(&strtab_data);
+
+        debug_assert_eq!(offset, buffer.len());
+
+        Ok(())
+    }
+}
+
+// JamCRC
+fn checksum(data: &[u8]) -> u32 {
+    let mut hasher = crc32fast::Hasher::new_with_initial(0xffff_ffff);
+    hasher.update(data);
+    !hasher.finalize()
+}
diff --git a/vendor/object-0.26.2/src/write/elf.rs b/vendor/object-0.26.2/src/write/elf.rs
new file mode 100644
index 000000000..34e0abc85
--- /dev/null
+++ b/vendor/object-0.26.2/src/write/elf.rs
@@ -0,0 +1,1314 @@
+use std::mem;
+use std::vec::Vec;
+
+use crate::elf;
+use crate::endian::*;
+use crate::write::string::*;
+use crate::write::util::*;
+use crate::write::*;
+use crate::AddressSize;
+
+#[derive(Default, Clone, Copy)]
+struct ComdatOffsets {
+    offset: usize,
+    str_id: Option<StringId>,
+    len: usize,
+}
+
+#[derive(Default, Clone, Copy)]
+struct SectionOffsets {
+    index: usize,
+    offset: usize,
+    str_id: Option<StringId>,
+    reloc_index: usize,
+    reloc_offset: usize,
+    reloc_len: usize,
+    reloc_str_id: Option<StringId>,
+}
+
+#[derive(Default, Clone, Copy)]
+struct SymbolOffsets {
+    index: usize,
+    str_id: Option<StringId>,
+}
+
+impl Object {
+    pub(crate) fn elf_section_info(
+        &self,
+        section: StandardSection,
+    ) -> (&'static [u8], &'static [u8], SectionKind) {
+        match section {
+            StandardSection::Text => (&[], &b".text"[..], SectionKind::Text),
+            StandardSection::Data => (&[], &b".data"[..], SectionKind::Data),
+            StandardSection::ReadOnlyData | StandardSection::ReadOnlyString => {
+                (&[], &b".rodata"[..], SectionKind::ReadOnlyData)
+            }
+            StandardSection::ReadOnlyDataWithRel => (&[], b".data.rel.ro", SectionKind::Data),
+            StandardSection::UninitializedData => {
+                (&[], &b".bss"[..], SectionKind::UninitializedData)
+            }
+            StandardSection::Tls => (&[], &b".tdata"[..], SectionKind::Tls),
+            StandardSection::UninitializedTls => {
+                (&[], &b".tbss"[..], SectionKind::UninitializedTls)
+            }
+            StandardSection::TlsVariables => {
+                // Unsupported section.
+                (&[], &[], SectionKind::TlsVariables)
+            }
+            StandardSection::Common => {
+                // Unsupported section.
+                (&[], &[], SectionKind::Common)
+            }
+        }
+    }
+
+    pub(crate) fn elf_subsection_name(&self, section: &[u8], value: &[u8]) -> Vec<u8> {
+        let mut name = section.to_vec();
+        name.push(b'.');
+        name.extend_from_slice(value);
+        name
+    }
+
+    fn elf_has_relocation_addend(&self) -> Result<bool> {
+        Ok(match self.architecture {
+            Architecture::Aarch64 => true,
+            Architecture::Arm => false,
+            Architecture::Avr => true,
+            Architecture::Bpf => false,
+            Architecture::I386 => false,
+            Architecture::X86_64 => true,
+            Architecture::X86_64_X32 => true,
+            Architecture::Hexagon => true,
+            Architecture::Mips => false,
+            Architecture::Mips64 => true,
+            Architecture::Msp430 => true,
+            Architecture::PowerPc => true,
+            Architecture::PowerPc64 => true,
+            Architecture::Riscv64 => true,
+            Architecture::Riscv32 => true,
+            Architecture::S390x => true,
+            Architecture::Sparc64 => true,
+            _ => {
+                return Err(Error(format!(
+                    "unimplemented architecture {:?}",
+                    self.architecture
+                )));
+            }
+        })
+    }
+
+    pub(crate) fn elf_fixup_relocation(&mut self, mut relocation: &mut Relocation) -> Result<i64> {
+        // Return true if we should use a section symbol to avoid preemption.
+        fn want_section_symbol(relocation: &Relocation, symbol: &Symbol) -> bool {
+            if symbol.scope != SymbolScope::Dynamic {
+                // Only dynamic symbols can be preemptible.
+                return false;
+            }
+            match symbol.kind {
+                SymbolKind::Text | SymbolKind::Data => {}
+                _ => return false,
+            }
+            match relocation.kind {
+                // Anything using GOT or PLT is preemptible.
+                // We also require that `Other` relocations must already be correct.
+                RelocationKind::Got
+                | RelocationKind::GotRelative
+                | RelocationKind::GotBaseRelative
+                | RelocationKind::PltRelative
+                | RelocationKind::Elf(_) => return false,
+                // Absolute relocations are preemptible for non-local data.
+                // TODO: not sure if this rule is exactly correct
+                // This rule was added to handle global data references in debuginfo.
+                // Maybe this should be a new relocation kind so that the caller can decide.
+                RelocationKind::Absolute => {
+                    if symbol.kind == SymbolKind::Data {
+                        return false;
+                    }
+                }
+                _ => {}
+            }
+            true
+        }
+
+        // Use section symbols for relocations where required to avoid preemption.
+        // Otherwise, the linker will fail with:
+        //     relocation R_X86_64_PC32 against symbol `SomeSymbolName' can not be used when
+        //     making a shared object; recompile with -fPIC
+        let symbol = &self.symbols[relocation.symbol.0];
+        if want_section_symbol(relocation, symbol) {
+            if let Some(section) = symbol.section.id() {
+                relocation.addend += symbol.value as i64;
+                relocation.symbol = self.section_symbol(section);
+            }
+        }
+
+        // Determine whether the addend is stored in the relocation or the data.
+        if self.elf_has_relocation_addend()? {
+            Ok(0)
+        } else {
+            let constant = relocation.addend;
+            relocation.addend = 0;
+            Ok(constant)
+        }
+    }
+
+    pub(crate) fn elf_write(&self, buffer: &mut dyn WritableBuffer) -> Result<()> {
+        let address_size = self.architecture.address_size().unwrap();
+        let endian = self.endian;
+        let elf32 = Elf32 { endian };
+        let elf64 = Elf64 { endian };
+        let elf: &dyn Elf = match address_size {
+            AddressSize::U8 | AddressSize::U16 | AddressSize::U32 => &elf32,
+            AddressSize::U64 => &elf64,
+        };
+        let pointer_align = address_size.bytes() as usize;
+        let is_mips64el =
+            self.architecture == Architecture::Mips64 && self.endian == Endianness::Little;
+
+        // Calculate offsets of everything.
+        let mut offset = 0;
+
+        // ELF header.
+        let e_ehsize = elf.file_header_size();
+        offset += e_ehsize;
+
+        // Create reloc section header names.
+        let is_rela = self.elf_has_relocation_addend()?;
+        let reloc_names: Vec<_> = self
+            .sections
+            .iter()
+            .map(|section| {
+                let mut reloc_name = Vec::new();
+                if !section.relocations.is_empty() {
+                    reloc_name.extend_from_slice(if is_rela {
+                        &b".rela"[..]
+                    } else {
+                        &b".rel"[..]
+                    });
+                    reloc_name.extend_from_slice(&section.name);
+                }
+                reloc_name
+            })
+            .collect();
+
+        // Calculate size of section data.
+        let mut shstrtab = StringTable::default();
+        let mut comdat_offsets = vec![ComdatOffsets::default(); self.comdats.len()];
+        let mut section_offsets = vec![SectionOffsets::default(); self.sections.len()];
+        // Null section.
+        let mut section_num = 1;
+        for (index, comdat) in self.comdats.iter().enumerate() {
+            if comdat.kind != ComdatKind::Any {
+                return Err(Error(format!(
+                    "unsupported COMDAT symbol `{}` kind {:?}",
+                    self.symbols[comdat.symbol.0].name().unwrap_or(""),
+                    comdat.kind
+                )));
+            }
+
+            comdat_offsets[index].str_id = Some(shstrtab.add(b".group"));
+            section_num += 1;
+            offset = align(offset, 4);
+            comdat_offsets[index].offset = offset;
+            let len = (comdat.sections.len() + 1) * 4;
+            comdat_offsets[index].len = len;
+            offset += len;
+        }
+        for (index, section) in self.sections.iter().enumerate() {
+            section_offsets[index].str_id = Some(shstrtab.add(&section.name));
+            section_offsets[index].index = section_num;
+            section_num += 1;
+
+            let len = section.data.len();
+            if len != 0 {
+                offset = align(offset, section.align as usize);
+                section_offsets[index].offset = offset;
+                offset += len;
+            } else {
+                section_offsets[index].offset = offset;
+            }
+
+            if !section.relocations.is_empty() {
+                section_offsets[index].reloc_str_id = Some(shstrtab.add(&reloc_names[index]));
+                section_offsets[index].reloc_index = section_num;
+                section_num += 1;
+            }
+        }
+
+        // Calculate index of symbols and add symbol strings to strtab.
+        let mut strtab = StringTable::default();
+        let mut symbol_offsets = vec![SymbolOffsets::default(); self.symbols.len()];
+        // Null symbol.
+        let mut symtab_count = 1;
+        // Local symbols must come before global.
+        for (index, symbol) in self.symbols.iter().enumerate() {
+            if symbol.is_local() {
+                symbol_offsets[index].index = symtab_count;
+                symtab_count += 1;
+            }
+        }
+        let symtab_count_local = symtab_count;
+        for (index, symbol) in self.symbols.iter().enumerate() {
+            if !symbol.is_local() {
+                symbol_offsets[index].index = symtab_count;
+                symtab_count += 1;
+            }
+        }
+        for (index, symbol) in self.symbols.iter().enumerate() {
+            if symbol.kind != SymbolKind::Section && !symbol.name.is_empty() {
+                symbol_offsets[index].str_id = Some(strtab.add(&symbol.name));
+            }
+        }
+
+        // Calculate size of symtab.
+        let symtab_str_id = shstrtab.add(&b".symtab"[..]);
+        offset = align(offset, pointer_align);
+        let symtab_offset = offset;
+        let symtab_len = symtab_count * elf.symbol_size();
+        offset += symtab_len;
+        let symtab_index = section_num;
+        section_num += 1;
+
+        // Calculate size of symtab_shndx.
+        let mut need_symtab_shndx = false;
+        for symbol in &self.symbols {
+            let index = symbol
+                .section
+                .id()
+                .map(|s| section_offsets[s.0].index)
+                .unwrap_or(0);
+            if index >= elf::SHN_LORESERVE as usize {
+                need_symtab_shndx = true;
+                break;
+            }
+        }
+        let symtab_shndx_offset = offset;
+        let mut symtab_shndx_str_id = None;
+        let mut symtab_shndx_len = 0;
+        if need_symtab_shndx {
+            symtab_shndx_str_id = Some(shstrtab.add(&b".symtab_shndx"[..]));
+            symtab_shndx_len = symtab_count * 4;
+            offset += symtab_shndx_len;
+            section_num += 1;
+        }
+
+        // Calculate size of strtab.
+        let strtab_str_id = shstrtab.add(&b".strtab"[..]);
+        let strtab_offset = offset;
+        // Start with null name.
+        let mut strtab_data = vec![0];
+        strtab.write(1, &mut strtab_data);
+        offset += strtab_data.len();
+        let strtab_index = section_num;
+        section_num += 1;
+
+        // Calculate size of relocations.
+        for (index, section) in self.sections.iter().enumerate() {
+            let count = section.relocations.len();
+            if count != 0 {
+                offset = align(offset, pointer_align);
+                section_offsets[index].reloc_offset = offset;
+                let len = count * elf.rel_size(is_rela);
+                section_offsets[index].reloc_len = len;
+                offset += len;
+            }
+        }
+
+        // Calculate size of shstrtab.
+        let shstrtab_str_id = shstrtab.add(&b".shstrtab"[..]);
+        let shstrtab_offset = offset;
+        // Start with null section name.
+        let mut shstrtab_data = vec![0];
+        shstrtab.write(1, &mut shstrtab_data);
+        offset += shstrtab_data.len();
+        let shstrtab_index = section_num;
+        section_num += 1;
+
+        // Calculate size of section headers.
+        offset = align(offset, pointer_align);
+        let e_shoff = offset;
+        let e_shentsize = elf.section_header_size();
+        offset += section_num * e_shentsize;
+
+        // Start writing.
+        buffer
+            .reserve(offset)
+            .map_err(|_| Error(String::from("Cannot allocate buffer")))?;
+
+        // Write file header.
+        let e_ident = elf::Ident {
+            magic: elf::ELFMAG,
+            class: match address_size {
+                AddressSize::U8 | AddressSize::U16 | AddressSize::U32 => elf::ELFCLASS32,
+                AddressSize::U64 => elf::ELFCLASS64,
+            },
+            data: if endian.is_little_endian() {
+                elf::ELFDATA2LSB
+            } else {
+                elf::ELFDATA2MSB
+            },
+            version: elf::EV_CURRENT,
+            os_abi: elf::ELFOSABI_NONE,
+            abi_version: 0,
+            padding: [0; 7],
+        };
+        let e_type = elf::ET_REL;
+        let e_machine = match self.architecture {
+            Architecture::Aarch64 => elf::EM_AARCH64,
+            Architecture::Arm => elf::EM_ARM,
+            Architecture::Avr => elf::EM_AVR,
+            Architecture::Bpf => elf::EM_BPF,
+            Architecture::I386 => elf::EM_386,
+            Architecture::X86_64 => elf::EM_X86_64,
+            Architecture::X86_64_X32 => elf::EM_X86_64,
+            Architecture::Hexagon => elf::EM_HEXAGON,
+            Architecture::Mips => elf::EM_MIPS,
+            Architecture::Mips64 => elf::EM_MIPS,
+            Architecture::Msp430 => elf::EM_MSP430,
+            Architecture::PowerPc => elf::EM_PPC,
+            Architecture::PowerPc64 => elf::EM_PPC64,
+            Architecture::Riscv32 => elf::EM_RISCV,
+            Architecture::Riscv64 => elf::EM_RISCV,
+            Architecture::S390x => elf::EM_S390,
+            Architecture::Sparc64 => elf::EM_SPARCV9,
+            _ => {
+                return Err(Error(format!(
+                    "unimplemented architecture {:?}",
+                    self.architecture
+                )));
+            }
+        };
+        let e_flags = if let FileFlags::Elf { e_flags } = self.flags {
+            e_flags
+        } else {
+            0
+        };
+        let e_shnum = if section_num >= elf::SHN_LORESERVE as usize {
+            0
+        } else {
+            section_num as u16
+        };
+        let e_shstrndx = if shstrtab_index >= elf::SHN_LORESERVE as usize {
+            elf::SHN_XINDEX
+        } else {
+            shstrtab_index as u16
+        };
+
+        elf.write_file_header(
+            buffer,
+            FileHeader {
+                e_ident,
+                e_type,
+                e_machine,
+                e_version: elf::EV_CURRENT.into(),
+                e_entry: 0,
+                e_phoff: 0,
+                e_shoff: e_shoff as u64,
+                e_flags,
+                e_ehsize: e_ehsize as u16,
+                e_phentsize: 0,
+                e_phnum: 0,
+                e_shentsize: e_shentsize as u16,
+                e_shnum,
+                e_shstrndx,
+            },
+        );
+
+        // Write section data.
+        for (index, comdat) in self.comdats.iter().enumerate() {
+            let mut data = Vec::new();
+            data.write_pod(&U32::new(self.endian, elf::GRP_COMDAT));
+            for section in &comdat.sections {
+                data.write_pod(&U32::new(
+                    self.endian,
+                    section_offsets[section.0].index as u32,
+                ));
+            }
+
+            write_align(buffer, 4);
+            debug_assert_eq!(comdat_offsets[index].offset, buffer.len());
+            debug_assert_eq!(comdat_offsets[index].len, data.len());
+            buffer.write_bytes(&data);
+        }
+        for (index, section) in self.sections.iter().enumerate() {
+            let len = section.data.len();
+            if len != 0 {
+                write_align(buffer, section.align as usize);
+                debug_assert_eq!(section_offsets[index].offset, buffer.len());
+                buffer.write_bytes(&section.data);
+            }
+        }
+
+        // Write symbols.
+        write_align(buffer, pointer_align);
+        debug_assert_eq!(symtab_offset, buffer.len());
+        elf.write_symbol(
+            buffer,
+            Sym {
+                st_name: 0,
+                st_info: 0,
+                st_other: 0,
+                st_shndx: 0,
+                st_value: 0,
+                st_size: 0,
+            },
+        );
+        let mut symtab_shndx = Vec::new();
+        if need_symtab_shndx {
+            symtab_shndx.write_pod(&U32::new(endian, 0));
+        }
+        let mut write_symbol = |index: usize, symbol: &Symbol| -> Result<()> {
+            let st_info = if let SymbolFlags::Elf { st_info, .. } = symbol.flags {
+                st_info
+            } else {
+                let st_type = match symbol.kind {
+                    SymbolKind::Null => elf::STT_NOTYPE,
+                    SymbolKind::Text => {
+                        if symbol.is_undefined() {
+                            elf::STT_NOTYPE
+                        } else {
+                            elf::STT_FUNC
+                        }
+                    }
+                    SymbolKind::Data => {
+                        if symbol.is_undefined() {
+                            elf::STT_NOTYPE
+                        } else if symbol.is_common() {
+                            elf::STT_COMMON
+                        } else {
+                            elf::STT_OBJECT
+                        }
+                    }
+                    SymbolKind::Section => elf::STT_SECTION,
+                    SymbolKind::File => elf::STT_FILE,
+                    SymbolKind::Tls => elf::STT_TLS,
+                    SymbolKind::Label => elf::STT_NOTYPE,
+                    SymbolKind::Unknown => {
+                        if symbol.is_undefined() {
+                            elf::STT_NOTYPE
+                        } else {
+                            return Err(Error(format!(
+                                "unimplemented symbol `{}` kind {:?}",
+                                symbol.name().unwrap_or(""),
+                                symbol.kind
+                            )));
+                        }
+                    }
+                };
+                let st_bind = if symbol.weak {
+                    elf::STB_WEAK
+                } else if symbol.is_undefined() {
+                    elf::STB_GLOBAL
+                } else if symbol.is_local() {
+                    elf::STB_LOCAL
+                } else {
+                    elf::STB_GLOBAL
+                };
+                (st_bind << 4) + st_type
+            };
+            let st_other = if let SymbolFlags::Elf { st_other, .. } = symbol.flags {
+                st_other
+            } else if symbol.scope == SymbolScope::Linkage {
+                elf::STV_HIDDEN
+            } else {
+                elf::STV_DEFAULT
+            };
+            let (st_shndx, xindex) = match symbol.section {
+                SymbolSection::None => {
+                    debug_assert_eq!(symbol.kind, SymbolKind::File);
+                    (elf::SHN_ABS, 0)
+                }
+                SymbolSection::Undefined => (elf::SHN_UNDEF, 0),
+                SymbolSection::Absolute => (elf::SHN_ABS, 0),
+                SymbolSection::Common => (elf::SHN_COMMON, 0),
+                SymbolSection::Section(id) => {
+                    let index = section_offsets[id.0].index as u32;
+                    (
+                        if index >= elf::SHN_LORESERVE as u32 {
+                            elf::SHN_XINDEX
+                        } else {
+                            index as u16
+                        },
+                        index,
+                    )
+                }
+            };
+            let st_name = symbol_offsets[index]
+                .str_id
+                .map(|id| strtab.get_offset(id))
+                .unwrap_or(0) as u32;
+            elf.write_symbol(
+                buffer,
+                Sym {
+                    st_name,
+                    st_info,
+                    st_other,
+                    st_shndx,
+                    st_value: symbol.value,
+                    st_size: symbol.size,
+                },
+            );
+            if need_symtab_shndx {
+                symtab_shndx.write_pod(&U32::new(endian, xindex));
+            }
+            Ok(())
+        };
+        for (index, symbol) in self.symbols.iter().enumerate() {
+            if symbol.is_local() {
+                write_symbol(index, symbol)?;
+            }
+        }
+        for (index, symbol) in self.symbols.iter().enumerate() {
+            if !symbol.is_local() {
+                write_symbol(index, symbol)?;
+            }
+        }
+        if need_symtab_shndx {
+            debug_assert_eq!(symtab_shndx_offset, buffer.len());
+            debug_assert_eq!(symtab_shndx_len, symtab_shndx.len());
+            buffer.write_bytes(&symtab_shndx);
+        }
+
+        // Write strtab section.
+        debug_assert_eq!(strtab_offset, buffer.len());
+        buffer.write_bytes(&strtab_data);
+
+        // Write relocations.
+        for (index, section) in self.sections.iter().enumerate() {
+            if !section.relocations.is_empty() {
+                write_align(buffer, pointer_align);
+                debug_assert_eq!(section_offsets[index].reloc_offset, buffer.len());
+                for reloc in &section.relocations {
+                    let r_type = match self.architecture {
+                        Architecture::Aarch64 => match (reloc.kind, reloc.encoding, reloc.size) {
+                            (RelocationKind::Absolute, RelocationEncoding::Generic, 64) => {
+                                elf::R_AARCH64_ABS64
+                            }
+                            (RelocationKind::Absolute, RelocationEncoding::Generic, 32) => {
+                                elf::R_AARCH64_ABS32
+                            }
+                            (RelocationKind::Absolute, RelocationEncoding::Generic, 16) => {
+                                elf::R_AARCH64_ABS16
+                            }
+                            (RelocationKind::Relative, RelocationEncoding::Generic, 64) => {
+                                elf::R_AARCH64_PREL64
+                            }
+                            (RelocationKind::Relative, RelocationEncoding::Generic, 32) => {
+                                elf::R_AARCH64_PREL32
+                            }
+                            (RelocationKind::Relative, RelocationEncoding::Generic, 16) => {
+                                elf::R_AARCH64_PREL16
+                            }
+                            (RelocationKind::Relative, RelocationEncoding::AArch64Call, 26)
+                            | (RelocationKind::PltRelative, RelocationEncoding::AArch64Call, 26) => {
+                                elf::R_AARCH64_CALL26
+                            }
+                            (RelocationKind::Elf(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::Arm => match (reloc.kind, reloc.encoding, reloc.size) {
+                            (RelocationKind::Absolute, _, 32) => elf::R_ARM_ABS32,
+                            (RelocationKind::Elf(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::Avr => match (reloc.kind, reloc.encoding, reloc.size) {
+                            (RelocationKind::Absolute, _, 32) => elf::R_AVR_32,
+                            (RelocationKind::Absolute, _, 16) => elf::R_AVR_16,
+                            (RelocationKind::Elf(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::Bpf => match (reloc.kind, reloc.encoding, reloc.size) {
+                            (RelocationKind::Absolute, _, 64) => elf::R_BPF_64_64,
+                            (RelocationKind::Absolute, _, 32) => elf::R_BPF_64_32,
+                            (RelocationKind::Elf(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::I386 => match (reloc.kind, reloc.size) {
+                            (RelocationKind::Absolute, 32) => elf::R_386_32,
+                            (RelocationKind::Relative, 32) => elf::R_386_PC32,
+                            (RelocationKind::Got, 32) => elf::R_386_GOT32,
+                            (RelocationKind::PltRelative, 32) => elf::R_386_PLT32,
+                            (RelocationKind::GotBaseOffset, 32) => elf::R_386_GOTOFF,
+                            (RelocationKind::GotBaseRelative, 32) => elf::R_386_GOTPC,
+                            (RelocationKind::Absolute, 16) => elf::R_386_16,
+                            (RelocationKind::Relative, 16) => elf::R_386_PC16,
+                            (RelocationKind::Absolute, 8) => elf::R_386_8,
+                            (RelocationKind::Relative, 8) => elf::R_386_PC8,
+                            (RelocationKind::Elf(x), _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::X86_64 | Architecture::X86_64_X32 => {
+                            match (reloc.kind, reloc.encoding, reloc.size) {
+                                (RelocationKind::Absolute, RelocationEncoding::Generic, 64) => {
+                                    elf::R_X86_64_64
+                                }
+                                (RelocationKind::Relative, _, 32) => elf::R_X86_64_PC32,
+                                (RelocationKind::Got, _, 32) => elf::R_X86_64_GOT32,
+                                (RelocationKind::PltRelative, _, 32) => elf::R_X86_64_PLT32,
+                                (RelocationKind::GotRelative, _, 32) => elf::R_X86_64_GOTPCREL,
+                                (RelocationKind::Absolute, RelocationEncoding::Generic, 32) => {
+                                    elf::R_X86_64_32
+                                }
+                                (RelocationKind::Absolute, RelocationEncoding::X86Signed, 32) => {
+                                    elf::R_X86_64_32S
+                                }
+                                (RelocationKind::Absolute, _, 16) => elf::R_X86_64_16,
+                                (RelocationKind::Relative, _, 16) => elf::R_X86_64_PC16,
+                                (RelocationKind::Absolute, _, 8) => elf::R_X86_64_8,
+                                (RelocationKind::Relative, _, 8) => elf::R_X86_64_PC8,
+                                (RelocationKind::Elf(x), _, _) => x,
+                                _ => {
+                                    return Err(Error(format!(
+                                        "unimplemented relocation {:?}",
+                                        reloc
+                                    )));
+                                }
+                            }
+                        }
+                        Architecture::Hexagon => match (reloc.kind, reloc.encoding, reloc.size) {
+                            (RelocationKind::Absolute, _, 32) => elf::R_HEX_32,
+                            (RelocationKind::Elf(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::Mips | Architecture::Mips64 => {
+                            match (reloc.kind, reloc.encoding, reloc.size) {
+                                (RelocationKind::Absolute, _, 16) => elf::R_MIPS_16,
+                                (RelocationKind::Absolute, _, 32) => elf::R_MIPS_32,
+                                (RelocationKind::Absolute, _, 64) => elf::R_MIPS_64,
+                                (RelocationKind::Elf(x), _, _) => x,
+                                _ => {
+                                    return Err(Error(format!(
+                                        "unimplemented relocation {:?}",
+                                        reloc
+                                    )));
+                                }
+                            }
+                        }
+                        Architecture::Msp430 => match (reloc.kind, reloc.encoding, reloc.size) {
+                            (RelocationKind::Absolute, _, 32) => elf::R_MSP430_32,
+                            (RelocationKind::Absolute, _, 16) => elf::R_MSP430_16_BYTE,
+                            (RelocationKind::Elf(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::PowerPc => match (reloc.kind, reloc.encoding, reloc.size) {
+                            (RelocationKind::Absolute, _, 32) => elf::R_PPC_ADDR32,
+                            (RelocationKind::Elf(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::PowerPc64 => match (reloc.kind, reloc.encoding, reloc.size) {
+                            (RelocationKind::Absolute, _, 32) => elf::R_PPC64_ADDR32,
+                            (RelocationKind::Absolute, _, 64) => elf::R_PPC64_ADDR64,
+                            (RelocationKind::Elf(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::Riscv32 | Architecture::Riscv64 => {
+                            match (reloc.kind, reloc.encoding, reloc.size) {
+                                (RelocationKind::Absolute, _, 32) => elf::R_RISCV_32,
+                                (RelocationKind::Absolute, _, 64) => elf::R_RISCV_64,
+                                (RelocationKind::Elf(x), _, _) => x,
+                                _ => {
+                                    return Err(Error(format!(
+                                        "unimplemented relocation {:?}",
+                                        reloc
+                                    )));
+                                }
+                            }
+                        }
+                        Architecture::S390x => match (reloc.kind, reloc.encoding, reloc.size) {
+                            (RelocationKind::Absolute, RelocationEncoding::Generic, 8) => {
+                                elf::R_390_8
+                            }
+                            (RelocationKind::Absolute, RelocationEncoding::Generic, 16) => {
+                                elf::R_390_16
+                            }
+                            (RelocationKind::Absolute, RelocationEncoding::Generic, 32) => {
+                                elf::R_390_32
+                            }
+                            (RelocationKind::Absolute, RelocationEncoding::Generic, 64) => {
+                                elf::R_390_64
+                            }
+                            (RelocationKind::Relative, RelocationEncoding::Generic, 16) => {
+                                elf::R_390_PC16
+                            }
+                            (RelocationKind::Relative, RelocationEncoding::Generic, 32) => {
+                                elf::R_390_PC32
+                            }
+                            (RelocationKind::Relative, RelocationEncoding::Generic, 64) => {
+                                elf::R_390_PC64
+                            }
+                            (RelocationKind::Relative, RelocationEncoding::S390xDbl, 16) => {
+                                elf::R_390_PC16DBL
+                            }
+                            (RelocationKind::Relative, RelocationEncoding::S390xDbl, 32) => {
+                                elf::R_390_PC32DBL
+                            }
+                            (RelocationKind::PltRelative, RelocationEncoding::S390xDbl, 16) => {
+                                elf::R_390_PLT16DBL
+                            }
+                            (RelocationKind::PltRelative, RelocationEncoding::S390xDbl, 32) => {
+                                elf::R_390_PLT32DBL
+                            }
+                            (RelocationKind::Got, RelocationEncoding::Generic, 16) => {
+                                elf::R_390_GOT16
+                            }
+                            (RelocationKind::Got, RelocationEncoding::Generic, 32) => {
+                                elf::R_390_GOT32
+                            }
+                            (RelocationKind::Got, RelocationEncoding::Generic, 64) => {
+                                elf::R_390_GOT64
+                            }
+                            (RelocationKind::GotRelative, RelocationEncoding::S390xDbl, 32) => {
+                                elf::R_390_GOTENT
+                            }
+                            (RelocationKind::GotBaseOffset, RelocationEncoding::Generic, 16) => {
+                                elf::R_390_GOTOFF16
+                            }
+                            (RelocationKind::GotBaseOffset, RelocationEncoding::Generic, 32) => {
+                                elf::R_390_GOTOFF32
+                            }
+                            (RelocationKind::GotBaseOffset, RelocationEncoding::Generic, 64) => {
+                                elf::R_390_GOTOFF64
+                            }
+                            (RelocationKind::GotBaseRelative, RelocationEncoding::Generic, 64) => {
+                                elf::R_390_GOTPC
+                            }
+                            (RelocationKind::GotBaseRelative, RelocationEncoding::S390xDbl, 32) => {
+                                elf::R_390_GOTPCDBL
+                            }
+                            (RelocationKind::Elf(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::Sparc64 => match (reloc.kind, reloc.encoding, reloc.size) {
+                            // TODO: use R_SPARC_32/R_SPARC_64 if aligned.
+                            (RelocationKind::Absolute, _, 32) => elf::R_SPARC_UA32,
+                            (RelocationKind::Absolute, _, 64) => elf::R_SPARC_UA64,
+                            (RelocationKind::Elf(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        _ => {
+                            if let RelocationKind::Elf(x) = reloc.kind {
+                                x
+                            } else {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        }
+                    };
+                    let r_sym = symbol_offsets[reloc.symbol.0].index as u32;
+                    elf.write_rel(
+                        buffer,
+                        is_mips64el,
+                        is_rela,
+                        Rel {
+                            r_offset: reloc.offset,
+                            r_sym,
+                            r_type,
+                            r_addend: reloc.addend,
+                        },
+                    );
+                }
+            }
+        }
+
+        // Write shstrtab section.
+        debug_assert_eq!(shstrtab_offset, buffer.len());
+        buffer.write_bytes(&shstrtab_data);
+
+        // Write section headers.
+        write_align(buffer, pointer_align);
+        debug_assert_eq!(e_shoff, buffer.len());
+        elf.write_section_header(
+            buffer,
+            SectionHeader {
+                sh_name: 0,
+                sh_type: 0,
+                sh_flags: 0,
+                sh_addr: 0,
+                sh_offset: 0,
+                sh_size: if section_num >= elf::SHN_LORESERVE as usize {
+                    section_num as u64
+                } else {
+                    0
+                },
+                sh_link: if shstrtab_index >= elf::SHN_LORESERVE as usize {
+                    shstrtab_index as u32
+                } else {
+                    0
+                },
+                // TODO: e_phnum overflow
+                sh_info: 0,
+                sh_addralign: 0,
+                sh_entsize: 0,
+            },
+        );
+        for (index, comdat) in self.comdats.iter().enumerate() {
+            let sh_name = comdat_offsets[index]
+                .str_id
+                .map(|id| shstrtab.get_offset(id))
+                .unwrap_or(0) as u32;
+            elf.write_section_header(
+                buffer,
+                SectionHeader {
+                    sh_name,
+                    sh_type: elf::SHT_GROUP,
+                    sh_flags: 0,
+                    sh_addr: 0,
+                    sh_offset: comdat_offsets[index].offset as u64,
+                    sh_size: comdat_offsets[index].len as u64,
+                    sh_link: symtab_index as u32,
+                    sh_info: symbol_offsets[comdat.symbol.0].index as u32,
+                    sh_addralign: 4,
+                    sh_entsize: 4,
+                },
+            );
+        }
+        for (index, section) in self.sections.iter().enumerate() {
+            let sh_type = match section.kind {
+                SectionKind::UninitializedData | SectionKind::UninitializedTls => elf::SHT_NOBITS,
+                SectionKind::Note => elf::SHT_NOTE,
+                SectionKind::Elf(sh_type) => sh_type,
+                _ => elf::SHT_PROGBITS,
+            };
+            let sh_flags = if let SectionFlags::Elf { sh_flags } = section.flags {
+                sh_flags
+            } else {
+                match section.kind {
+                    SectionKind::Text => elf::SHF_ALLOC | elf::SHF_EXECINSTR,
+                    SectionKind::Data => elf::SHF_ALLOC | elf::SHF_WRITE,
+                    SectionKind::Tls => elf::SHF_ALLOC | elf::SHF_WRITE | elf::SHF_TLS,
+                    SectionKind::UninitializedData => elf::SHF_ALLOC | elf::SHF_WRITE,
+                    SectionKind::UninitializedTls => elf::SHF_ALLOC | elf::SHF_WRITE | elf::SHF_TLS,
+                    SectionKind::ReadOnlyData => elf::SHF_ALLOC,
+                    SectionKind::ReadOnlyString => {
+                        elf::SHF_ALLOC | elf::SHF_STRINGS | elf::SHF_MERGE
+                    }
+                    SectionKind::OtherString => elf::SHF_STRINGS | elf::SHF_MERGE,
+                    SectionKind::Other
+                    | SectionKind::Debug
+                    | SectionKind::Metadata
+                    | SectionKind::Linker
+                    | SectionKind::Note
+                    | SectionKind::Elf(_) => 0,
+                    SectionKind::Unknown | SectionKind::Common | SectionKind::TlsVariables => {
+                        return Err(Error(format!(
+                            "unimplemented section `{}` kind {:?}",
+                            section.name().unwrap_or(""),
+                            section.kind
+                        )));
+                    }
+                }
+                .into()
+            };
+            // TODO: not sure if this is correct, maybe user should determine this
+            let sh_entsize = match section.kind {
+                SectionKind::ReadOnlyString | SectionKind::OtherString => 1,
+                _ => 0,
+            };
+            let sh_name = section_offsets[index]
+                .str_id
+                .map(|id| shstrtab.get_offset(id))
+                .unwrap_or(0) as u32;
+            elf.write_section_header(
+                buffer,
+                SectionHeader {
+                    sh_name,
+                    sh_type,
+                    sh_flags,
+                    sh_addr: 0,
+                    sh_offset: section_offsets[index].offset as u64,
+                    sh_size: section.size,
+                    sh_link: 0,
+                    sh_info: 0,
+                    sh_addralign: section.align,
+                    sh_entsize,
+                },
+            );
+
+            if !section.relocations.is_empty() {
+                let sh_name = section_offsets[index]
+                    .reloc_str_id
+                    .map(|id| shstrtab.get_offset(id))
+                    .unwrap_or(0);
+                elf.write_section_header(
+                    buffer,
+                    SectionHeader {
+                        sh_name: sh_name as u32,
+                        sh_type: if is_rela { elf::SHT_RELA } else { elf::SHT_REL },
+                        sh_flags: elf::SHF_INFO_LINK.into(),
+                        sh_addr: 0,
+                        sh_offset: section_offsets[index].reloc_offset as u64,
+                        sh_size: section_offsets[index].reloc_len as u64,
+                        sh_link: symtab_index as u32,
+                        sh_info: section_offsets[index].index as u32,
+                        sh_addralign: pointer_align as u64,
+                        sh_entsize: elf.rel_size(is_rela) as u64,
+                    },
+                );
+            }
+        }
+
+        // Write symtab section header.
+        elf.write_section_header(
+            buffer,
+            SectionHeader {
+                sh_name: shstrtab.get_offset(symtab_str_id) as u32,
+                sh_type: elf::SHT_SYMTAB,
+                sh_flags: 0,
+                sh_addr: 0,
+                sh_offset: symtab_offset as u64,
+                sh_size: symtab_len as u64,
+                sh_link: strtab_index as u32,
+                sh_info: symtab_count_local as u32,
+                sh_addralign: pointer_align as u64,
+                sh_entsize: elf.symbol_size() as u64,
+            },
+        );
+
+        // Write symtab_shndx section header.
+        if need_symtab_shndx {
+            elf.write_section_header(
+                buffer,
+                SectionHeader {
+                    sh_name: shstrtab.get_offset(symtab_shndx_str_id.unwrap()) as u32,
+                    sh_type: elf::SHT_SYMTAB_SHNDX,
+                    sh_flags: 0,
+                    sh_addr: 0,
+                    sh_offset: symtab_shndx_offset as u64,
+                    sh_size: symtab_shndx_len as u64,
+                    sh_link: symtab_index as u32,
+                    sh_info: symtab_count_local as u32,
+                    sh_addralign: 4,
+                    sh_entsize: 4,
+                },
+            );
+        }
+
+        // Write strtab section header.
+        elf.write_section_header(
+            buffer,
+            SectionHeader {
+                sh_name: shstrtab.get_offset(strtab_str_id) as u32,
+                sh_type: elf::SHT_STRTAB,
+                sh_flags: 0,
+                sh_addr: 0,
+                sh_offset: strtab_offset as u64,
+                sh_size: strtab_data.len() as u64,
+                sh_link: 0,
+                sh_info: 0,
+                sh_addralign: 1,
+                sh_entsize: 0,
+            },
+        );
+
+        // Write shstrtab section header.
+        elf.write_section_header(
+            buffer,
+            SectionHeader {
+                sh_name: shstrtab.get_offset(shstrtab_str_id) as u32,
+                sh_type: elf::SHT_STRTAB,
+                sh_flags: 0,
+                sh_addr: 0,
+                sh_offset: shstrtab_offset as u64,
+                sh_size: shstrtab_data.len() as u64,
+                sh_link: 0,
+                sh_info: 0,
+                sh_addralign: 1,
+                sh_entsize: 0,
+            },
+        );
+
+        debug_assert_eq!(offset, buffer.len());
+
+        Ok(())
+    }
+}
+
+/// Native endian version of `FileHeader64`.
+struct FileHeader {
+    e_ident: elf::Ident,
+    e_type: u16,
+    e_machine: u16,
+    e_version: u32,
+    e_entry: u64,
+    e_phoff: u64,
+    e_shoff: u64,
+    e_flags: u32,
+    e_ehsize: u16,
+    e_phentsize: u16,
+    e_phnum: u16,
+    e_shentsize: u16,
+    e_shnum: u16,
+    e_shstrndx: u16,
+}
+
+/// Native endian version of `SectionHeader64`.
+struct SectionHeader {
+    sh_name: u32,
+    sh_type: u32,
+    sh_flags: u64,
+    sh_addr: u64,
+    sh_offset: u64,
+    sh_size: u64,
+    sh_link: u32,
+    sh_info: u32,
+    sh_addralign: u64,
+    sh_entsize: u64,
+}
+
+/// Native endian version of `Sym64`.
+struct Sym {
+    st_name: u32,
+    st_info: u8,
+    st_other: u8,
+    st_shndx: u16,
+    st_value: u64,
+    st_size: u64,
+}
+
+/// Unified native endian version of `Rel*`.
+struct Rel {
+    r_offset: u64,
+    r_sym: u32,
+    r_type: u32,
+    r_addend: i64,
+}
+
+trait Elf {
+    fn file_header_size(&self) -> usize;
+    fn section_header_size(&self) -> usize;
+    fn symbol_size(&self) -> usize;
+    fn rel_size(&self, is_rela: bool) -> usize;
+    fn write_file_header(&self, buffer: &mut dyn WritableBuffer, section: FileHeader);
+    fn write_section_header(&self, buffer: &mut dyn WritableBuffer, section: SectionHeader);
+    fn write_symbol(&self, buffer: &mut dyn WritableBuffer, symbol: Sym);
+    fn write_rel(
+        &self,
+        buffer: &mut dyn WritableBuffer,
+        is_mips64el: bool,
+        is_rela: bool,
+        rel: Rel,
+    );
+}
+
+struct Elf32<E> {
+    endian: E,
+}
+
+impl<E: Endian> Elf for Elf32<E> {
+    fn file_header_size(&self) -> usize {
+        mem::size_of::<elf::FileHeader32<E>>()
+    }
+
+    fn section_header_size(&self) -> usize {
+        mem::size_of::<elf::SectionHeader32<E>>()
+    }
+
+    fn symbol_size(&self) -> usize {
+        mem::size_of::<elf::Sym32<E>>()
+    }
+
+    fn rel_size(&self, is_rela: bool) -> usize {
+        if is_rela {
+            mem::size_of::<elf::Rela32<E>>()
+        } else {
+            mem::size_of::<elf::Rel32<E>>()
+        }
+    }
+
+    fn write_file_header(&self, buffer: &mut dyn WritableBuffer, file: FileHeader) {
+        let endian = self.endian;
+        let file = elf::FileHeader32 {
+            e_ident: file.e_ident,
+            e_type: U16::new(endian, file.e_type),
+            e_machine: U16::new(endian, file.e_machine),
+            e_version: U32::new(endian, file.e_version),
+            e_entry: U32::new(endian, file.e_entry as u32),
+            e_phoff: U32::new(endian, file.e_phoff as u32),
+            e_shoff: U32::new(endian, file.e_shoff as u32),
+            e_flags: U32::new(endian, file.e_flags),
+            e_ehsize: U16::new(endian, file.e_ehsize),
+            e_phentsize: U16::new(endian, file.e_phentsize),
+            e_phnum: U16::new(endian, file.e_phnum),
+            e_shentsize: U16::new(endian, file.e_shentsize),
+            e_shnum: U16::new(endian, file.e_shnum),
+            e_shstrndx: U16::new(endian, file.e_shstrndx),
+        };
+        buffer.write(&file);
+    }
+
+    fn write_section_header(&self, buffer: &mut dyn WritableBuffer, section: SectionHeader) {
+        let endian = self.endian;
+        let section = elf::SectionHeader32 {
+            sh_name: U32::new(endian, section.sh_name),
+            sh_type: U32::new(endian, section.sh_type),
+            sh_flags: U32::new(endian, section.sh_flags as u32),
+            sh_addr: U32::new(endian, section.sh_addr as u32),
+            sh_offset: U32::new(endian, section.sh_offset as u32),
+            sh_size: U32::new(endian, section.sh_size as u32),
+            sh_link: U32::new(endian, section.sh_link),
+            sh_info: U32::new(endian, section.sh_info),
+            sh_addralign: U32::new(endian, section.sh_addralign as u32),
+            sh_entsize: U32::new(endian, section.sh_entsize as u32),
+        };
+        buffer.write(&section);
+    }
+
+    fn write_symbol(&self, buffer: &mut dyn WritableBuffer, symbol: Sym) {
+        let endian = self.endian;
+        let symbol = elf::Sym32 {
+            st_name: U32::new(endian, symbol.st_name),
+            st_info: symbol.st_info,
+            st_other: symbol.st_other,
+            st_shndx: U16::new(endian, symbol.st_shndx),
+            st_value: U32::new(endian, symbol.st_value as u32),
+            st_size: U32::new(endian, symbol.st_size as u32),
+        };
+        buffer.write(&symbol);
+    }
+
+    fn write_rel(
+        &self,
+        buffer: &mut dyn WritableBuffer,
+        _is_mips64el: bool,
+        is_rela: bool,
+        rel: Rel,
+    ) {
+        let endian = self.endian;
+        if is_rela {
+            let rel = elf::Rela32 {
+                r_offset: U32::new(endian, rel.r_offset as u32),
+                r_info: elf::Rel32::r_info(endian, rel.r_sym, rel.r_type as u8),
+                r_addend: I32::new(endian, rel.r_addend as i32),
+            };
+            buffer.write(&rel);
+        } else {
+            let rel = elf::Rel32 {
+                r_offset: U32::new(endian, rel.r_offset as u32),
+                r_info: elf::Rel32::r_info(endian, rel.r_sym, rel.r_type as u8),
+            };
+            buffer.write(&rel);
+        }
+    }
+}
+
+struct Elf64<E> {
+    endian: E,
+}
+
+impl<E: Endian> Elf for Elf64<E> {
+    fn file_header_size(&self) -> usize {
+        mem::size_of::<elf::FileHeader64<E>>()
+    }
+
+    fn section_header_size(&self) -> usize {
+        mem::size_of::<elf::SectionHeader64<E>>()
+    }
+
+    fn symbol_size(&self) -> usize {
+        mem::size_of::<elf::Sym64<E>>()
+    }
+
+    fn rel_size(&self, is_rela: bool) -> usize {
+        if is_rela {
+            mem::size_of::<elf::Rela64<E>>()
+        } else {
+            mem::size_of::<elf::Rel64<E>>()
+        }
+    }
+
+    fn write_file_header(&self, buffer: &mut dyn WritableBuffer, file: FileHeader) {
+        let endian = self.endian;
+        let file = elf::FileHeader64 {
+            e_ident: file.e_ident,
+            e_type: U16::new(endian, file.e_type),
+            e_machine: U16::new(endian, file.e_machine),
+            e_version: U32::new(endian, file.e_version),
+            e_entry: U64::new(endian, file.e_entry),
+            e_phoff: U64::new(endian, file.e_phoff),
+            e_shoff: U64::new(endian, file.e_shoff),
+            e_flags: U32::new(endian, file.e_flags),
+            e_ehsize: U16::new(endian, file.e_ehsize),
+            e_phentsize: U16::new(endian, file.e_phentsize),
+            e_phnum: U16::new(endian, file.e_phnum),
+            e_shentsize: U16::new(endian, file.e_shentsize),
+            e_shnum: U16::new(endian, file.e_shnum),
+            e_shstrndx: U16::new(endian, file.e_shstrndx),
+        };
+        buffer.write(&file)
+    }
+
+    fn write_section_header(&self, buffer: &mut dyn WritableBuffer, section: SectionHeader) {
+        let endian = self.endian;
+        let section = elf::SectionHeader64 {
+            sh_name: U32::new(endian, section.sh_name),
+            sh_type: U32::new(endian, section.sh_type),
+            sh_flags: U64::new(endian, section.sh_flags),
+            sh_addr: U64::new(endian, section.sh_addr),
+            sh_offset: U64::new(endian, section.sh_offset),
+            sh_size: U64::new(endian, section.sh_size),
+            sh_link: U32::new(endian, section.sh_link),
+            sh_info: U32::new(endian, section.sh_info),
+            sh_addralign: U64::new(endian, section.sh_addralign),
+            sh_entsize: U64::new(endian, section.sh_entsize),
+        };
+        buffer.write(&section);
+    }
+
+    fn write_symbol(&self, buffer: &mut dyn WritableBuffer, symbol: Sym) {
+        let endian = self.endian;
+        let symbol = elf::Sym64 {
+            st_name: U32::new(endian, symbol.st_name),
+            st_info: symbol.st_info,
+            st_other: symbol.st_other,
+            st_shndx: U16::new(endian, symbol.st_shndx),
+            st_value: U64::new(endian, symbol.st_value),
+            st_size: U64::new(endian, symbol.st_size),
+        };
+        buffer.write(&symbol);
+    }
+
+    fn write_rel(
+        &self,
+        buffer: &mut dyn WritableBuffer,
+        is_mips64el: bool,
+        is_rela: bool,
+        rel: Rel,
+    ) {
+        let endian = self.endian;
+        if is_rela {
+            let rel = elf::Rela64 {
+                r_offset: U64::new(endian, rel.r_offset),
+                r_info: elf::Rela64::r_info(endian, is_mips64el, rel.r_sym, rel.r_type),
+                r_addend: I64::new(endian, rel.r_addend),
+            };
+            buffer.write(&rel);
+        } else {
+            let rel = elf::Rel64 {
+                r_offset: U64::new(endian, rel.r_offset),
+                r_info: elf::Rel64::r_info(endian, rel.r_sym, rel.r_type),
+            };
+            buffer.write(&rel);
+        }
+    }
+}
diff --git a/vendor/object-0.26.2/src/write/macho.rs b/vendor/object-0.26.2/src/write/macho.rs
new file mode 100644
index 000000000..ed25950d9
--- /dev/null
+++ b/vendor/object-0.26.2/src/write/macho.rs
@@ -0,0 +1,844 @@
+use std::mem;
+
+use crate::endian::*;
+use crate::macho;
+use crate::write::string::*;
+use crate::write::util::*;
+use crate::write::*;
+use crate::AddressSize;
+
+#[derive(Default, Clone, Copy)]
+struct SectionOffsets {
+    index: usize,
+    offset: usize,
+    address: u64,
+    reloc_offset: usize,
+}
+
+#[derive(Default, Clone, Copy)]
+struct SymbolOffsets {
+    emit: bool,
+    index: usize,
+    str_id: Option<StringId>,
+}
+
+impl Object {
+    pub(crate) fn macho_set_subsections_via_symbols(&mut self) {
+        let flags = match self.flags {
+            FileFlags::MachO { flags } => flags,
+            _ => 0,
+        };
+        self.flags = FileFlags::MachO {
+            flags: flags | macho::MH_SUBSECTIONS_VIA_SYMBOLS,
+        };
+    }
+
+    pub(crate) fn macho_segment_name(&self, segment: StandardSegment) -> &'static [u8] {
+        match segment {
+            StandardSegment::Text => &b"__TEXT"[..],
+            StandardSegment::Data => &b"__DATA"[..],
+            StandardSegment::Debug => &b"__DWARF"[..],
+        }
+    }
+
+    pub(crate) fn macho_section_info(
+        &self,
+        section: StandardSection,
+    ) -> (&'static [u8], &'static [u8], SectionKind) {
+        match section {
+            StandardSection::Text => (&b"__TEXT"[..], &b"__text"[..], SectionKind::Text),
+            StandardSection::Data => (&b"__DATA"[..], &b"__data"[..], SectionKind::Data),
+            StandardSection::ReadOnlyData => {
+                (&b"__TEXT"[..], &b"__const"[..], SectionKind::ReadOnlyData)
+            }
+            StandardSection::ReadOnlyDataWithRel => {
+                (&b"__DATA"[..], &b"__const"[..], SectionKind::ReadOnlyData)
+            }
+            StandardSection::ReadOnlyString => (
+                &b"__TEXT"[..],
+                &b"__cstring"[..],
+                SectionKind::ReadOnlyString,
+            ),
+            StandardSection::UninitializedData => (
+                &b"__DATA"[..],
+                &b"__bss"[..],
+                SectionKind::UninitializedData,
+            ),
+            StandardSection::Tls => (&b"__DATA"[..], &b"__thread_data"[..], SectionKind::Tls),
+            StandardSection::UninitializedTls => (
+                &b"__DATA"[..],
+                &b"__thread_bss"[..],
+                SectionKind::UninitializedTls,
+            ),
+            StandardSection::TlsVariables => (
+                &b"__DATA"[..],
+                &b"__thread_vars"[..],
+                SectionKind::TlsVariables,
+            ),
+            StandardSection::Common => (&b"__DATA"[..], &b"__common"[..], SectionKind::Common),
+        }
+    }
+
+    fn macho_tlv_bootstrap(&mut self) -> SymbolId {
+        match self.tlv_bootstrap {
+            Some(id) => id,
+            None => {
+                let id = self.add_symbol(Symbol {
+                    name: b"_tlv_bootstrap".to_vec(),
+                    value: 0,
+                    size: 0,
+                    kind: SymbolKind::Text,
+                    scope: SymbolScope::Dynamic,
+                    weak: false,
+                    section: SymbolSection::Undefined,
+                    flags: SymbolFlags::None,
+                });
+                self.tlv_bootstrap = Some(id);
+                id
+            }
+        }
+    }
+
+    /// Create the `__thread_vars` entry for a TLS variable.
+    ///
+    /// The symbol given by `symbol_id` will be updated to point to this entry.
+    ///
+    /// A new `SymbolId` will be returned. The caller must update this symbol
+    /// to point to the initializer.
+    ///
+    /// If `symbol_id` is not for a TLS variable, then it is returned unchanged.
+    pub(crate) fn macho_add_thread_var(&mut self, symbol_id: SymbolId) -> SymbolId {
+        let symbol = self.symbol_mut(symbol_id);
+        if symbol.kind != SymbolKind::Tls {
+            return symbol_id;
+        }
+
+        // Create the initializer symbol.
+        let mut name = symbol.name.clone();
+        name.extend_from_slice(b"$tlv$init");
+        let init_symbol_id = self.add_raw_symbol(Symbol {
+            name,
+            value: 0,
+            size: 0,
+            kind: SymbolKind::Tls,
+            scope: SymbolScope::Compilation,
+            weak: false,
+            section: SymbolSection::Undefined,
+            flags: SymbolFlags::None,
+        });
+
+        // Add the tlv entry.
+        // Three pointers in size:
+        //   - __tlv_bootstrap - used to make sure support exists
+        //   - spare pointer - used when mapped by the runtime
+        //   - pointer to symbol initializer
+        let section = self.section_id(StandardSection::TlsVariables);
+        let address_size = self.architecture.address_size().unwrap().bytes();
+        let size = u64::from(address_size) * 3;
+        let data = vec![0; size as usize];
+        let offset = self.append_section_data(section, &data, u64::from(address_size));
+
+        let tlv_bootstrap = self.macho_tlv_bootstrap();
+        self.add_relocation(
+            section,
+            Relocation {
+                offset,
+                size: address_size * 8,
+                kind: RelocationKind::Absolute,
+                encoding: RelocationEncoding::Generic,
+                symbol: tlv_bootstrap,
+                addend: 0,
+            },
+        )
+        .unwrap();
+        self.add_relocation(
+            section,
+            Relocation {
+                offset: offset + u64::from(address_size) * 2,
+                size: address_size * 8,
+                kind: RelocationKind::Absolute,
+                encoding: RelocationEncoding::Generic,
+                symbol: init_symbol_id,
+                addend: 0,
+            },
+        )
+        .unwrap();
+
+        // Update the symbol to point to the tlv.
+        let symbol = self.symbol_mut(symbol_id);
+        symbol.value = offset;
+        symbol.size = size;
+        symbol.section = SymbolSection::Section(section);
+
+        init_symbol_id
+    }
+
+    pub(crate) fn macho_fixup_relocation(&mut self, mut relocation: &mut Relocation) -> i64 {
+        let constant = match relocation.kind {
+            RelocationKind::Relative
+            | RelocationKind::GotRelative
+            | RelocationKind::PltRelative => relocation.addend + 4,
+            _ => relocation.addend,
+        };
+        relocation.addend -= constant;
+        constant
+    }
+
+    pub(crate) fn macho_write(&self, buffer: &mut dyn WritableBuffer) -> Result<()> {
+        let address_size = self.architecture.address_size().unwrap();
+        let endian = self.endian;
+        let macho32 = MachO32 { endian };
+        let macho64 = MachO64 { endian };
+        let macho: &dyn MachO = match address_size {
+            AddressSize::U8 | AddressSize::U16 | AddressSize::U32 => &macho32,
+            AddressSize::U64 => &macho64,
+        };
+        let pointer_align = address_size.bytes() as usize;
+
+        // Calculate offsets of everything, and build strtab.
+        let mut offset = 0;
+
+        // Calculate size of Mach-O header.
+        offset += macho.mach_header_size();
+
+        // Calculate size of commands.
+        let mut ncmds = 0;
+        let command_offset = offset;
+
+        // Calculate size of segment command and section headers.
+        let segment_command_offset = offset;
+        let segment_command_len =
+            macho.segment_command_size() + self.sections.len() * macho.section_header_size();
+        offset += segment_command_len;
+        ncmds += 1;
+
+        // Calculate size of symtab command.
+        let symtab_command_offset = offset;
+        let symtab_command_len = mem::size_of::<macho::SymtabCommand<Endianness>>();
+        offset += symtab_command_len;
+        ncmds += 1;
+
+        let sizeofcmds = offset - command_offset;
+
+        // Calculate size of section data.
+        let mut segment_file_offset = None;
+        let mut section_offsets = vec![SectionOffsets::default(); self.sections.len()];
+        let mut address = 0;
+        for (index, section) in self.sections.iter().enumerate() {
+            section_offsets[index].index = 1 + index;
+            if !section.is_bss() {
+                let len = section.data.len();
+                if len != 0 {
+                    offset = align(offset, section.align as usize);
+                    section_offsets[index].offset = offset;
+                    if segment_file_offset.is_none() {
+                        segment_file_offset = Some(offset);
+                    }
+                    offset += len;
+                } else {
+                    section_offsets[index].offset = offset;
+                }
+                address = align_u64(address, section.align);
+                section_offsets[index].address = address;
+                address += section.size;
+            }
+        }
+        for (index, section) in self.sections.iter().enumerate() {
+            if section.kind.is_bss() {
+                assert!(section.data.is_empty());
+                address = align_u64(address, section.align);
+                section_offsets[index].address = address;
+                address += section.size;
+            }
+        }
+        let segment_file_offset = segment_file_offset.unwrap_or(offset);
+        let segment_file_size = offset - segment_file_offset;
+        debug_assert!(segment_file_size as u64 <= address);
+
+        // Count symbols and add symbol strings to strtab.
+        let mut strtab = StringTable::default();
+        let mut symbol_offsets = vec![SymbolOffsets::default(); self.symbols.len()];
+        let mut nsyms = 0;
+        for (index, symbol) in self.symbols.iter().enumerate() {
+            // The unified API allows creating symbols that we don't emit, so filter
+            // them out here.
+            //
+            // Since we don't actually emit the symbol kind, we validate it here too.
+            match symbol.kind {
+                SymbolKind::Text | SymbolKind::Data | SymbolKind::Tls => {}
+                SymbolKind::File | SymbolKind::Section => continue,
+                SymbolKind::Unknown => {
+                    if symbol.section != SymbolSection::Undefined {
+                        return Err(Error(format!(
+                            "defined symbol `{}` with unknown kind",
+                            symbol.name().unwrap_or(""),
+                        )));
+                    }
+                }
+                SymbolKind::Null | SymbolKind::Label => {
+                    return Err(Error(format!(
+                        "unimplemented symbol `{}` kind {:?}",
+                        symbol.name().unwrap_or(""),
+                        symbol.kind
+                    )));
+                }
+            }
+            symbol_offsets[index].emit = true;
+            symbol_offsets[index].index = nsyms;
+            nsyms += 1;
+            if !symbol.name.is_empty() {
+                symbol_offsets[index].str_id = Some(strtab.add(&symbol.name));
+            }
+        }
+
+        // Calculate size of symtab.
+        offset = align(offset, pointer_align);
+        let symtab_offset = offset;
+        let symtab_len = nsyms * macho.nlist_size();
+        offset += symtab_len;
+
+        // Calculate size of strtab.
+        let strtab_offset = offset;
+        // Start with null name.
+        let mut strtab_data = vec![0];
+        strtab.write(1, &mut strtab_data);
+        offset += strtab_data.len();
+
+        // Calculate size of relocations.
+        for (index, section) in self.sections.iter().enumerate() {
+            let count = section.relocations.len();
+            if count != 0 {
+                offset = align(offset, 4);
+                section_offsets[index].reloc_offset = offset;
+                let len = count * mem::size_of::<macho::Relocation<Endianness>>();
+                offset += len;
+            }
+        }
+
+        // Start writing.
+        buffer
+            .reserve(offset)
+            .map_err(|_| Error(String::from("Cannot allocate buffer")))?;
+
+        // Write file header.
+        let (cputype, cpusubtype) = match self.architecture {
+            Architecture::Arm => (macho::CPU_TYPE_ARM, macho::CPU_SUBTYPE_ARM_ALL),
+            Architecture::Aarch64 => (macho::CPU_TYPE_ARM64, macho::CPU_SUBTYPE_ARM64_ALL),
+            Architecture::I386 => (macho::CPU_TYPE_X86, macho::CPU_SUBTYPE_I386_ALL),
+            Architecture::X86_64 => (macho::CPU_TYPE_X86_64, macho::CPU_SUBTYPE_X86_64_ALL),
+            _ => {
+                return Err(Error(format!(
+                    "unimplemented architecture {:?}",
+                    self.architecture
+                )));
+            }
+        };
+
+        let flags = match self.flags {
+            FileFlags::MachO { flags } => flags,
+            _ => 0,
+        };
+        macho.write_mach_header(
+            buffer,
+            MachHeader {
+                cputype,
+                cpusubtype,
+                filetype: macho::MH_OBJECT,
+                ncmds,
+                sizeofcmds: sizeofcmds as u32,
+                flags,
+            },
+        );
+
+        // Write segment command.
+        debug_assert_eq!(segment_command_offset, buffer.len());
+        macho.write_segment_command(
+            buffer,
+            SegmentCommand {
+                cmdsize: segment_command_len as u32,
+                segname: [0; 16],
+                vmaddr: 0,
+                vmsize: address,
+                fileoff: segment_file_offset as u64,
+                filesize: segment_file_size as u64,
+                maxprot: macho::VM_PROT_READ | macho::VM_PROT_WRITE | macho::VM_PROT_EXECUTE,
+                initprot: macho::VM_PROT_READ | macho::VM_PROT_WRITE | macho::VM_PROT_EXECUTE,
+                nsects: self.sections.len() as u32,
+                flags: 0,
+            },
+        );
+
+        // Write section headers.
+        for (index, section) in self.sections.iter().enumerate() {
+            let mut sectname = [0; 16];
+            sectname
+                .get_mut(..section.name.len())
+                .ok_or_else(|| {
+                    Error(format!(
+                        "section name `{}` is too long",
+                        section.name().unwrap_or(""),
+                    ))
+                })?
+                .copy_from_slice(&section.name);
+            let mut segname = [0; 16];
+            segname
+                .get_mut(..section.segment.len())
+                .ok_or_else(|| {
+                    Error(format!(
+                        "segment name `{}` is too long",
+                        section.segment().unwrap_or(""),
+                    ))
+                })?
+                .copy_from_slice(&section.segment);
+            let flags = if let SectionFlags::MachO { flags } = section.flags {
+                flags
+            } else {
+                match section.kind {
+                    SectionKind::Text => {
+                        macho::S_ATTR_PURE_INSTRUCTIONS | macho::S_ATTR_SOME_INSTRUCTIONS
+                    }
+                    SectionKind::Data => 0,
+                    SectionKind::ReadOnlyData => 0,
+                    SectionKind::ReadOnlyString => macho::S_CSTRING_LITERALS,
+                    SectionKind::UninitializedData | SectionKind::Common => macho::S_ZEROFILL,
+                    SectionKind::Tls => macho::S_THREAD_LOCAL_REGULAR,
+                    SectionKind::UninitializedTls => macho::S_THREAD_LOCAL_ZEROFILL,
+                    SectionKind::TlsVariables => macho::S_THREAD_LOCAL_VARIABLES,
+                    SectionKind::Debug => macho::S_ATTR_DEBUG,
+                    SectionKind::OtherString => macho::S_CSTRING_LITERALS,
+                    SectionKind::Other | SectionKind::Linker | SectionKind::Metadata => 0,
+                    SectionKind::Note | SectionKind::Unknown | SectionKind::Elf(_) => {
+                        return Err(Error(format!(
+                            "unimplemented section `{}` kind {:?}",
+                            section.name().unwrap_or(""),
+                            section.kind
+                        )));
+                    }
+                }
+            };
+            macho.write_section(
+                buffer,
+                SectionHeader {
+                    sectname,
+                    segname,
+                    addr: section_offsets[index].address,
+                    size: section.size,
+                    offset: section_offsets[index].offset as u32,
+                    align: section.align.trailing_zeros(),
+                    reloff: section_offsets[index].reloc_offset as u32,
+                    nreloc: section.relocations.len() as u32,
+                    flags,
+                },
+            );
+        }
+
+        // Write symtab command.
+        debug_assert_eq!(symtab_command_offset, buffer.len());
+        let symtab_command = macho::SymtabCommand {
+            cmd: U32::new(endian, macho::LC_SYMTAB),
+            cmdsize: U32::new(endian, symtab_command_len as u32),
+            symoff: U32::new(endian, symtab_offset as u32),
+            nsyms: U32::new(endian, nsyms as u32),
+            stroff: U32::new(endian, strtab_offset as u32),
+            strsize: U32::new(endian, strtab_data.len() as u32),
+        };
+        buffer.write(&symtab_command);
+
+        // Write section data.
+        for (index, section) in self.sections.iter().enumerate() {
+            let len = section.data.len();
+            if len != 0 {
+                write_align(buffer, section.align as usize);
+                debug_assert_eq!(section_offsets[index].offset, buffer.len());
+                buffer.write_bytes(&section.data);
+            }
+        }
+        debug_assert_eq!(segment_file_offset + segment_file_size, buffer.len());
+
+        // Write symtab.
+        write_align(buffer, pointer_align);
+        debug_assert_eq!(symtab_offset, buffer.len());
+        for (index, symbol) in self.symbols.iter().enumerate() {
+            if !symbol_offsets[index].emit {
+                continue;
+            }
+            // TODO: N_STAB
+            let (mut n_type, n_sect) = match symbol.section {
+                SymbolSection::Undefined => (macho::N_UNDF | macho::N_EXT, 0),
+                SymbolSection::Absolute => (macho::N_ABS, 0),
+                SymbolSection::Section(id) => (macho::N_SECT, id.0 + 1),
+                SymbolSection::None | SymbolSection::Common => {
+                    return Err(Error(format!(
+                        "unimplemented symbol `{}` section {:?}",
+                        symbol.name().unwrap_or(""),
+                        symbol.section
+                    )));
+                }
+            };
+            match symbol.scope {
+                SymbolScope::Unknown | SymbolScope::Compilation => {}
+                SymbolScope::Linkage => {
+                    n_type |= macho::N_EXT | macho::N_PEXT;
+                }
+                SymbolScope::Dynamic => {
+                    n_type |= macho::N_EXT;
+                }
+            }
+
+            let n_desc = if let SymbolFlags::MachO { n_desc } = symbol.flags {
+                n_desc
+            } else {
+                let mut n_desc = 0;
+                if symbol.weak {
+                    if symbol.is_undefined() {
+                        n_desc |= macho::N_WEAK_REF;
+                    } else {
+                        n_desc |= macho::N_WEAK_DEF;
+                    }
+                }
+                n_desc
+            };
+
+            let n_value = match symbol.section.id() {
+                Some(section) => section_offsets[section.0].address + symbol.value,
+                None => symbol.value,
+            };
+
+            let n_strx = symbol_offsets[index]
+                .str_id
+                .map(|id| strtab.get_offset(id))
+                .unwrap_or(0);
+
+            macho.write_nlist(
+                buffer,
+                Nlist {
+                    n_strx: n_strx as u32,
+                    n_type,
+                    n_sect: n_sect as u8,
+                    n_desc,
+                    n_value,
+                },
+            );
+        }
+
+        // Write strtab.
+        debug_assert_eq!(strtab_offset, buffer.len());
+        buffer.write_bytes(&strtab_data);
+
+        // Write relocations.
+        for (index, section) in self.sections.iter().enumerate() {
+            if !section.relocations.is_empty() {
+                write_align(buffer, 4);
+                debug_assert_eq!(section_offsets[index].reloc_offset, buffer.len());
+                for reloc in &section.relocations {
+                    let r_extern;
+                    let r_symbolnum;
+                    let symbol = &self.symbols[reloc.symbol.0];
+                    if symbol.kind == SymbolKind::Section {
+                        r_symbolnum = section_offsets[symbol.section.id().unwrap().0].index as u32;
+                        r_extern = false;
+                    } else {
+                        r_symbolnum = symbol_offsets[reloc.symbol.0].index as u32;
+                        r_extern = true;
+                    }
+                    let r_length = match reloc.size {
+                        8 => 0,
+                        16 => 1,
+                        32 => 2,
+                        64 => 3,
+                        _ => return Err(Error(format!("unimplemented reloc size {:?}", reloc))),
+                    };
+                    let (r_pcrel, r_type) = match self.architecture {
+                        Architecture::I386 => match reloc.kind {
+                            RelocationKind::Absolute => (false, macho::GENERIC_RELOC_VANILLA),
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::X86_64 => match (reloc.kind, reloc.encoding, reloc.addend) {
+                            (RelocationKind::Absolute, RelocationEncoding::Generic, 0) => {
+                                (false, macho::X86_64_RELOC_UNSIGNED)
+                            }
+                            (RelocationKind::Relative, RelocationEncoding::Generic, -4) => {
+                                (true, macho::X86_64_RELOC_SIGNED)
+                            }
+                            (RelocationKind::Relative, RelocationEncoding::X86RipRelative, -4) => {
+                                (true, macho::X86_64_RELOC_SIGNED)
+                            }
+                            (RelocationKind::Relative, RelocationEncoding::X86Branch, -4) => {
+                                (true, macho::X86_64_RELOC_BRANCH)
+                            }
+                            (RelocationKind::PltRelative, RelocationEncoding::X86Branch, -4) => {
+                                (true, macho::X86_64_RELOC_BRANCH)
+                            }
+                            (RelocationKind::GotRelative, RelocationEncoding::Generic, -4) => {
+                                (true, macho::X86_64_RELOC_GOT)
+                            }
+                            (
+                                RelocationKind::GotRelative,
+                                RelocationEncoding::X86RipRelativeMovq,
+                                -4,
+                            ) => (true, macho::X86_64_RELOC_GOT_LOAD),
+                            (RelocationKind::MachO { value, relative }, _, _) => (relative, value),
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        _ => {
+                            return Err(Error(format!(
+                                "unimplemented architecture {:?}",
+                                self.architecture
+                            )));
+                        }
+                    };
+                    let reloc_info = macho::RelocationInfo {
+                        r_address: reloc.offset as u32,
+                        r_symbolnum,
+                        r_pcrel,
+                        r_length,
+                        r_extern,
+                        r_type,
+                    };
+                    buffer.write(&reloc_info.relocation(endian));
+                }
+            }
+        }
+
+        debug_assert_eq!(offset, buffer.len());
+
+        Ok(())
+    }
+}
+
+struct MachHeader {
+    cputype: u32,
+    cpusubtype: u32,
+    filetype: u32,
+    ncmds: u32,
+    sizeofcmds: u32,
+    flags: u32,
+}
+
+struct SegmentCommand {
+    cmdsize: u32,
+    segname: [u8; 16],
+    vmaddr: u64,
+    vmsize: u64,
+    fileoff: u64,
+    filesize: u64,
+    maxprot: u32,
+    initprot: u32,
+    nsects: u32,
+    flags: u32,
+}
+
+pub struct SectionHeader {
+    sectname: [u8; 16],
+    segname: [u8; 16],
+    addr: u64,
+    size: u64,
+    offset: u32,
+    align: u32,
+    reloff: u32,
+    nreloc: u32,
+    flags: u32,
+}
+
+struct Nlist {
+    n_strx: u32,
+    n_type: u8,
+    n_sect: u8,
+    n_desc: u16,
+    n_value: u64,
+}
+
+trait MachO {
+    fn mach_header_size(&self) -> usize;
+    fn segment_command_size(&self) -> usize;
+    fn section_header_size(&self) -> usize;
+    fn nlist_size(&self) -> usize;
+    fn write_mach_header(&self, buffer: &mut dyn WritableBuffer, section: MachHeader);
+    fn write_segment_command(&self, buffer: &mut dyn WritableBuffer, segment: SegmentCommand);
+    fn write_section(&self, buffer: &mut dyn WritableBuffer, section: SectionHeader);
+    fn write_nlist(&self, buffer: &mut dyn WritableBuffer, nlist: Nlist);
+}
+
+struct MachO32<E> {
+    endian: E,
+}
+
+impl<E: Endian> MachO for MachO32<E> {
+    fn mach_header_size(&self) -> usize {
+        mem::size_of::<macho::MachHeader32<E>>()
+    }
+
+    fn segment_command_size(&self) -> usize {
+        mem::size_of::<macho::SegmentCommand32<E>>()
+    }
+
+    fn section_header_size(&self) -> usize {
+        mem::size_of::<macho::Section32<E>>()
+    }
+
+    fn nlist_size(&self) -> usize {
+        mem::size_of::<macho::Nlist32<E>>()
+    }
+
+    fn write_mach_header(&self, buffer: &mut dyn WritableBuffer, header: MachHeader) {
+        let endian = self.endian;
+        let magic = if endian.is_big_endian() {
+            macho::MH_MAGIC
+        } else {
+            macho::MH_CIGAM
+        };
+        let header = macho::MachHeader32 {
+            magic: U32::new(BigEndian, magic),
+            cputype: U32::new(endian, header.cputype),
+            cpusubtype: U32::new(endian, header.cpusubtype),
+            filetype: U32::new(endian, header.filetype),
+            ncmds: U32::new(endian, header.ncmds),
+            sizeofcmds: U32::new(endian, header.sizeofcmds),
+            flags: U32::new(endian, header.flags),
+        };
+        buffer.write(&header);
+    }
+
+    fn write_segment_command(&self, buffer: &mut dyn WritableBuffer, segment: SegmentCommand) {
+        let endian = self.endian;
+        let segment = macho::SegmentCommand32 {
+            cmd: U32::new(endian, macho::LC_SEGMENT),
+            cmdsize: U32::new(endian, segment.cmdsize),
+            segname: segment.segname,
+            vmaddr: U32::new(endian, segment.vmaddr as u32),
+            vmsize: U32::new(endian, segment.vmsize as u32),
+            fileoff: U32::new(endian, segment.fileoff as u32),
+            filesize: U32::new(endian, segment.filesize as u32),
+            maxprot: U32::new(endian, segment.maxprot),
+            initprot: U32::new(endian, segment.initprot),
+            nsects: U32::new(endian, segment.nsects),
+            flags: U32::new(endian, segment.flags),
+        };
+        buffer.write(&segment);
+    }
+
+    fn write_section(&self, buffer: &mut dyn WritableBuffer, section: SectionHeader) {
+        let endian = self.endian;
+        let section = macho::Section32 {
+            sectname: section.sectname,
+            segname: section.segname,
+            addr: U32::new(endian, section.addr as u32),
+            size: U32::new(endian, section.size as u32),
+            offset: U32::new(endian, section.offset),
+            align: U32::new(endian, section.align),
+            reloff: U32::new(endian, section.reloff),
+            nreloc: U32::new(endian, section.nreloc),
+            flags: U32::new(endian, section.flags),
+            reserved1: U32::default(),
+            reserved2: U32::default(),
+        };
+        buffer.write(&section);
+    }
+
+    fn write_nlist(&self, buffer: &mut dyn WritableBuffer, nlist: Nlist) {
+        let endian = self.endian;
+        let nlist = macho::Nlist32 {
+            n_strx: U32::new(endian, nlist.n_strx),
+            n_type: nlist.n_type,
+            n_sect: nlist.n_sect,
+            n_desc: U16::new(endian, nlist.n_desc),
+            n_value: U32::new(endian, nlist.n_value as u32),
+        };
+        buffer.write(&nlist);
+    }
+}
+
+struct MachO64<E> {
+    endian: E,
+}
+
+impl<E: Endian> MachO for MachO64<E> {
+    fn mach_header_size(&self) -> usize {
+        mem::size_of::<macho::MachHeader64<E>>()
+    }
+
+    fn segment_command_size(&self) -> usize {
+        mem::size_of::<macho::SegmentCommand64<E>>()
+    }
+
+    fn section_header_size(&self) -> usize {
+        mem::size_of::<macho::Section64<E>>()
+    }
+
+    fn nlist_size(&self) -> usize {
+        mem::size_of::<macho::Nlist64<E>>()
+    }
+
+    fn write_mach_header(&self, buffer: &mut dyn WritableBuffer, header: MachHeader) {
+        let endian = self.endian;
+        let magic = if endian.is_big_endian() {
+            macho::MH_MAGIC_64
+        } else {
+            macho::MH_CIGAM_64
+        };
+        let header = macho::MachHeader64 {
+            magic: U32::new(BigEndian, magic),
+            cputype: U32::new(endian, header.cputype),
+            cpusubtype: U32::new(endian, header.cpusubtype),
+            filetype: U32::new(endian, header.filetype),
+            ncmds: U32::new(endian, header.ncmds),
+            sizeofcmds: U32::new(endian, header.sizeofcmds),
+            flags: U32::new(endian, header.flags),
+            reserved: U32::default(),
+        };
+        buffer.write(&header);
+    }
+
+    fn write_segment_command(&self, buffer: &mut dyn WritableBuffer, segment: SegmentCommand) {
+        let endian = self.endian;
+        let segment = macho::SegmentCommand64 {
+            cmd: U32::new(endian, macho::LC_SEGMENT_64),
+            cmdsize: U32::new(endian, segment.cmdsize),
+            segname: segment.segname,
+            vmaddr: U64::new(endian, segment.vmaddr),
+            vmsize: U64::new(endian, segment.vmsize),
+            fileoff: U64::new(endian, segment.fileoff),
+            filesize: U64::new(endian, segment.filesize),
+            maxprot: U32::new(endian, segment.maxprot),
+            initprot: U32::new(endian, segment.initprot),
+            nsects: U32::new(endian, segment.nsects),
+            flags: U32::new(endian, segment.flags),
+        };
+        buffer.write(&segment);
+    }
+
+    fn write_section(&self, buffer: &mut dyn WritableBuffer, section: SectionHeader) {
+        let endian = self.endian;
+        let section = macho::Section64 {
+            sectname: section.sectname,
+            segname: section.segname,
+            addr: U64::new(endian, section.addr),
+            size: U64::new(endian, section.size),
+            offset: U32::new(endian, section.offset),
+            align: U32::new(endian, section.align),
+            reloff: U32::new(endian, section.reloff),
+            nreloc: U32::new(endian, section.nreloc),
+            flags: U32::new(endian, section.flags),
+            reserved1: U32::default(),
+            reserved2: U32::default(),
+            reserved3: U32::default(),
+        };
+        buffer.write(&section);
+    }
+
+    fn write_nlist(&self, buffer: &mut dyn WritableBuffer, nlist: Nlist) {
+        let endian = self.endian;
+        let nlist = macho::Nlist64 {
+            n_strx: U32::new(endian, nlist.n_strx),
+            n_type: nlist.n_type,
+            n_sect: nlist.n_sect,
+            n_desc: U16::new(endian, nlist.n_desc),
+            n_value: U64Bytes::new(endian, nlist.n_value),
+        };
+        buffer.write(&nlist);
+    }
+}
diff --git a/vendor/object-0.26.2/src/write/mod.rs b/vendor/object-0.26.2/src/write/mod.rs
new file mode 100644
index 000000000..747e2a02e
--- /dev/null
+++ b/vendor/object-0.26.2/src/write/mod.rs
@@ -0,0 +1,858 @@
+//! Interface for writing object files.
+
+use std::collections::HashMap;
+use std::string::String;
+use std::vec::Vec;
+use std::{error, fmt, result, str};
+
+use crate::endian::{Endianness, U32, U64};
+use crate::{
+    Architecture, BinaryFormat, ComdatKind, FileFlags, RelocationEncoding, RelocationKind,
+    SectionFlags, SectionKind, SymbolFlags, SymbolKind, SymbolScope,
+};
+
+#[cfg(feature = "coff")]
+mod coff;
+#[cfg(feature = "elf")]
+mod elf;
+#[cfg(feature = "macho")]
+mod macho;
+mod string;
+mod util;
+pub use util::*;
+
+/// The error type used within the write module.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct Error(String);
+
+impl fmt::Display for Error {
+    #[inline]
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.write_str(&self.0)
+    }
+}
+
+impl error::Error for Error {}
+
+/// The result type used within the write module.
+pub type Result<T> = result::Result<T, Error>;
+
+/// A writable object file.
+#[derive(Debug)]
+pub struct Object {
+    format: BinaryFormat,
+    architecture: Architecture,
+    endian: Endianness,
+    sections: Vec<Section>,
+    standard_sections: HashMap<StandardSection, SectionId>,
+    symbols: Vec<Symbol>,
+    symbol_map: HashMap<Vec<u8>, SymbolId>,
+    stub_symbols: HashMap<SymbolId, SymbolId>,
+    comdats: Vec<Comdat>,
+    /// File flags that are specific to each file format.
+    pub flags: FileFlags,
+    /// The symbol name mangling scheme.
+    pub mangling: Mangling,
+    /// Mach-O "_tlv_bootstrap" symbol.
+    tlv_bootstrap: Option<SymbolId>,
+}
+
+impl Object {
+    /// Create an empty object file.
+    pub fn new(format: BinaryFormat, architecture: Architecture, endian: Endianness) -> Object {
+        Object {
+            format,
+            architecture,
+            endian,
+            sections: Vec::new(),
+            standard_sections: HashMap::new(),
+            symbols: Vec::new(),
+            symbol_map: HashMap::new(),
+            stub_symbols: HashMap::new(),
+            comdats: Vec::new(),
+            flags: FileFlags::None,
+            mangling: Mangling::default(format, architecture),
+            tlv_bootstrap: None,
+        }
+    }
+
+    /// Return the file format.
+    #[inline]
+    pub fn format(&self) -> BinaryFormat {
+        self.format
+    }
+
+    /// Return the architecture.
+    #[inline]
+    pub fn architecture(&self) -> Architecture {
+        self.architecture
+    }
+
+    /// Return the current mangling setting.
+    #[inline]
+    pub fn mangling(&self) -> Mangling {
+        self.mangling
+    }
+
+    /// Specify the mangling setting.
+    #[inline]
+    pub fn set_mangling(&mut self, mangling: Mangling) {
+        self.mangling = mangling;
+    }
+
+    /// Return the name for a standard segment.
+    ///
+    /// This will vary based on the file format.
+    #[allow(unused_variables)]
+    pub fn segment_name(&self, segment: StandardSegment) -> &'static [u8] {
+        match self.format {
+            #[cfg(feature = "coff")]
+            BinaryFormat::Coff => &[],
+            #[cfg(feature = "elf")]
+            BinaryFormat::Elf => &[],
+            #[cfg(feature = "macho")]
+            BinaryFormat::MachO => self.macho_segment_name(segment),
+            _ => unimplemented!(),
+        }
+    }
+
+    /// Get the section with the given `SectionId`.
+    #[inline]
+    pub fn section(&self, section: SectionId) -> &Section {
+        &self.sections[section.0]
+    }
+
+    /// Mutably get the section with the given `SectionId`.
+    #[inline]
+    pub fn section_mut(&mut self, section: SectionId) -> &mut Section {
+        &mut self.sections[section.0]
+    }
+
+    /// Append data to an existing section. Returns the section offset of the data.
+    pub fn append_section_data(&mut self, section: SectionId, data: &[u8], align: u64) -> u64 {
+        self.sections[section.0].append_data(data, align)
+    }
+
+    /// Append zero-initialized data to an existing section. Returns the section offset of the data.
+    pub fn append_section_bss(&mut self, section: SectionId, size: u64, align: u64) -> u64 {
+        self.sections[section.0].append_bss(size, align)
+    }
+
+    /// Return the `SectionId` of a standard section.
+    ///
+    /// If the section doesn't already exist then it is created.
+    pub fn section_id(&mut self, section: StandardSection) -> SectionId {
+        self.standard_sections
+            .get(&section)
+            .cloned()
+            .unwrap_or_else(|| {
+                let (segment, name, kind) = self.section_info(section);
+                self.add_section(segment.to_vec(), name.to_vec(), kind)
+            })
+    }
+
+    /// Add a new section and return its `SectionId`.
+    ///
+    /// This also creates a section symbol.
+    pub fn add_section(&mut self, segment: Vec<u8>, name: Vec<u8>, kind: SectionKind) -> SectionId {
+        let id = SectionId(self.sections.len());
+        self.sections.push(Section {
+            segment,
+            name,
+            kind,
+            size: 0,
+            align: 1,
+            data: Vec::new(),
+            relocations: Vec::new(),
+            symbol: None,
+            flags: SectionFlags::None,
+        });
+
+        // Add to self.standard_sections if required. This may match multiple standard sections.
+        let section = &self.sections[id.0];
+        for standard_section in StandardSection::all() {
+            if !self.standard_sections.contains_key(standard_section) {
+                let (segment, name, kind) = self.section_info(*standard_section);
+                if segment == &*section.segment && name == &*section.name && kind == section.kind {
+                    self.standard_sections.insert(*standard_section, id);
+                }
+            }
+        }
+
+        id
+    }
+
+    fn section_info(
+        &self,
+        section: StandardSection,
+    ) -> (&'static [u8], &'static [u8], SectionKind) {
+        match self.format {
+            #[cfg(feature = "coff")]
+            BinaryFormat::Coff => self.coff_section_info(section),
+            #[cfg(feature = "elf")]
+            BinaryFormat::Elf => self.elf_section_info(section),
+            #[cfg(feature = "macho")]
+            BinaryFormat::MachO => self.macho_section_info(section),
+            _ => unimplemented!(),
+        }
+    }
+
+    /// Add a subsection. Returns the `SectionId` and section offset of the data.
+    pub fn add_subsection(
+        &mut self,
+        section: StandardSection,
+        name: &[u8],
+        data: &[u8],
+        align: u64,
+    ) -> (SectionId, u64) {
+        let section_id = if self.has_subsections_via_symbols() {
+            self.set_subsections_via_symbols();
+            self.section_id(section)
+        } else {
+            let (segment, name, kind) = self.subsection_info(section, name);
+            self.add_section(segment.to_vec(), name, kind)
+        };
+        let offset = self.append_section_data(section_id, data, align);
+        (section_id, offset)
+    }
+
+    fn has_subsections_via_symbols(&self) -> bool {
+        match self.format {
+            BinaryFormat::Coff | BinaryFormat::Elf => false,
+            BinaryFormat::MachO => true,
+            _ => unimplemented!(),
+        }
+    }
+
+    fn set_subsections_via_symbols(&mut self) {
+        match self.format {
+            #[cfg(feature = "macho")]
+            BinaryFormat::MachO => self.macho_set_subsections_via_symbols(),
+            _ => unimplemented!(),
+        }
+    }
+
+    fn subsection_info(
+        &self,
+        section: StandardSection,
+        value: &[u8],
+    ) -> (&'static [u8], Vec<u8>, SectionKind) {
+        let (segment, section, kind) = self.section_info(section);
+        let name = self.subsection_name(section, value);
+        (segment, name, kind)
+    }
+
+    #[allow(unused_variables)]
+    fn subsection_name(&self, section: &[u8], value: &[u8]) -> Vec<u8> {
+        debug_assert!(!self.has_subsections_via_symbols());
+        match self.format {
+            #[cfg(feature = "coff")]
+            BinaryFormat::Coff => self.coff_subsection_name(section, value),
+            #[cfg(feature = "elf")]
+            BinaryFormat::Elf => self.elf_subsection_name(section, value),
+            _ => unimplemented!(),
+        }
+    }
+
+    /// Get the COMDAT section group with the given `ComdatId`.
+    #[inline]
+    pub fn comdat(&self, comdat: ComdatId) -> &Comdat {
+        &self.comdats[comdat.0]
+    }
+
+    /// Mutably get the COMDAT section group with the given `ComdatId`.
+    #[inline]
+    pub fn comdat_mut(&mut self, comdat: ComdatId) -> &mut Comdat {
+        &mut self.comdats[comdat.0]
+    }
+
+    /// Add a new COMDAT section group and return its `ComdatId`.
+    pub fn add_comdat(&mut self, comdat: Comdat) -> ComdatId {
+        let comdat_id = ComdatId(self.comdats.len());
+        self.comdats.push(comdat);
+        comdat_id
+    }
+
+    /// Get the `SymbolId` of the symbol with the given name.
+    pub fn symbol_id(&self, name: &[u8]) -> Option<SymbolId> {
+        self.symbol_map.get(name).cloned()
+    }
+
+    /// Get the symbol with the given `SymbolId`.
+    #[inline]
+    pub fn symbol(&self, symbol: SymbolId) -> &Symbol {
+        &self.symbols[symbol.0]
+    }
+
+    /// Mutably get the symbol with the given `SymbolId`.
+    #[inline]
+    pub fn symbol_mut(&mut self, symbol: SymbolId) -> &mut Symbol {
+        &mut self.symbols[symbol.0]
+    }
+
+    /// Add a new symbol and return its `SymbolId`.
+    pub fn add_symbol(&mut self, mut symbol: Symbol) -> SymbolId {
+        // Defined symbols must have a scope.
+        debug_assert!(symbol.is_undefined() || symbol.scope != SymbolScope::Unknown);
+        if symbol.kind == SymbolKind::Section {
+            // There can only be one section symbol, but update its flags, since
+            // the automatically generated section symbol will have none.
+            let symbol_id = self.section_symbol(symbol.section.id().unwrap());
+            if symbol.flags != SymbolFlags::None {
+                self.symbol_mut(symbol_id).flags = symbol.flags;
+            }
+            return symbol_id;
+        }
+        if !symbol.name.is_empty()
+            && (symbol.kind == SymbolKind::Text
+                || symbol.kind == SymbolKind::Data
+                || symbol.kind == SymbolKind::Tls)
+        {
+            let unmangled_name = symbol.name.clone();
+            if let Some(prefix) = self.mangling.global_prefix() {
+                symbol.name.insert(0, prefix);
+            }
+            let symbol_id = self.add_raw_symbol(symbol);
+            self.symbol_map.insert(unmangled_name, symbol_id);
+            symbol_id
+        } else {
+            self.add_raw_symbol(symbol)
+        }
+    }
+
+    fn add_raw_symbol(&mut self, symbol: Symbol) -> SymbolId {
+        let symbol_id = SymbolId(self.symbols.len());
+        self.symbols.push(symbol);
+        symbol_id
+    }
+
+    /// Return true if the file format supports `StandardSection::UninitializedTls`.
+    #[inline]
+    pub fn has_uninitialized_tls(&self) -> bool {
+        self.format != BinaryFormat::Coff
+    }
+
+    /// Return true if the file format supports `StandardSection::Common`.
+    #[inline]
+    pub fn has_common(&self) -> bool {
+        self.format == BinaryFormat::MachO
+    }
+
+    /// Add a new common symbol and return its `SymbolId`.
+    ///
+    /// For Mach-O, this appends the symbol to the `__common` section.
+    pub fn add_common_symbol(&mut self, mut symbol: Symbol, size: u64, align: u64) -> SymbolId {
+        if self.has_common() {
+            let symbol_id = self.add_symbol(symbol);
+            let section = self.section_id(StandardSection::Common);
+            self.add_symbol_bss(symbol_id, section, size, align);
+            symbol_id
+        } else {
+            symbol.section = SymbolSection::Common;
+            symbol.size = size;
+            self.add_symbol(symbol)
+        }
+    }
+
+    /// Add a new file symbol and return its `SymbolId`.
+    pub fn add_file_symbol(&mut self, name: Vec<u8>) -> SymbolId {
+        self.add_raw_symbol(Symbol {
+            name,
+            value: 0,
+            size: 0,
+            kind: SymbolKind::File,
+            scope: SymbolScope::Compilation,
+            weak: false,
+            section: SymbolSection::None,
+            flags: SymbolFlags::None,
+        })
+    }
+
+    /// Get the symbol for a section.
+    pub fn section_symbol(&mut self, section_id: SectionId) -> SymbolId {
+        let section = &mut self.sections[section_id.0];
+        if let Some(symbol) = section.symbol {
+            return symbol;
+        }
+        let name = if self.format == BinaryFormat::Coff {
+            section.name.clone()
+        } else {
+            Vec::new()
+        };
+        let symbol_id = SymbolId(self.symbols.len());
+        self.symbols.push(Symbol {
+            name,
+            value: 0,
+            size: 0,
+            kind: SymbolKind::Section,
+            scope: SymbolScope::Compilation,
+            weak: false,
+            section: SymbolSection::Section(section_id),
+            flags: SymbolFlags::None,
+        });
+        section.symbol = Some(symbol_id);
+        symbol_id
+    }
+
+    /// Append data to an existing section, and update a symbol to refer to it.
+    ///
+    /// For Mach-O, this also creates a `__thread_vars` entry for TLS symbols, and the
+    /// symbol will indirectly point to the added data via the `__thread_vars` entry.
+    ///
+    /// Returns the section offset of the data.
+    pub fn add_symbol_data(
+        &mut self,
+        symbol_id: SymbolId,
+        section: SectionId,
+        data: &[u8],
+        align: u64,
+    ) -> u64 {
+        let offset = self.append_section_data(section, data, align);
+        self.set_symbol_data(symbol_id, section, offset, data.len() as u64);
+        offset
+    }
+
+    /// Append zero-initialized data to an existing section, and update a symbol to refer to it.
+    ///
+    /// For Mach-O, this also creates a `__thread_vars` entry for TLS symbols, and the
+    /// symbol will indirectly point to the added data via the `__thread_vars` entry.
+    ///
+    /// Returns the section offset of the data.
+    pub fn add_symbol_bss(
+        &mut self,
+        symbol_id: SymbolId,
+        section: SectionId,
+        size: u64,
+        align: u64,
+    ) -> u64 {
+        let offset = self.append_section_bss(section, size, align);
+        self.set_symbol_data(symbol_id, section, offset, size);
+        offset
+    }
+
+    /// Update a symbol to refer to the given data within a section.
+    ///
+    /// For Mach-O, this also creates a `__thread_vars` entry for TLS symbols, and the
+    /// symbol will indirectly point to the data via the `__thread_vars` entry.
+    #[allow(unused_mut)]
+    pub fn set_symbol_data(
+        &mut self,
+        mut symbol_id: SymbolId,
+        section: SectionId,
+        offset: u64,
+        size: u64,
+    ) {
+        // Defined symbols must have a scope.
+        debug_assert!(self.symbol(symbol_id).scope != SymbolScope::Unknown);
+        match self.format {
+            #[cfg(feature = "macho")]
+            BinaryFormat::MachO => symbol_id = self.macho_add_thread_var(symbol_id),
+            _ => {}
+        }
+        let symbol = self.symbol_mut(symbol_id);
+        symbol.value = offset;
+        symbol.size = size;
+        symbol.section = SymbolSection::Section(section);
+    }
+
+    /// Convert a symbol to a section symbol and offset.
+    ///
+    /// Returns `None` if the symbol does not have a section.
+    pub fn symbol_section_and_offset(&mut self, symbol_id: SymbolId) -> Option<(SymbolId, u64)> {
+        let symbol = self.symbol(symbol_id);
+        if symbol.kind == SymbolKind::Section {
+            return Some((symbol_id, 0));
+        }
+        let symbol_offset = symbol.value;
+        let section = symbol.section.id()?;
+        let section_symbol = self.section_symbol(section);
+        Some((section_symbol, symbol_offset))
+    }
+
+    /// Add a relocation to a section.
+    ///
+    /// Relocations must only be added after the referenced symbols have been added
+    /// and defined (if applicable).
+    pub fn add_relocation(&mut self, section: SectionId, mut relocation: Relocation) -> Result<()> {
+        let addend = match self.format {
+            #[cfg(feature = "coff")]
+            BinaryFormat::Coff => self.coff_fixup_relocation(&mut relocation),
+            #[cfg(feature = "elf")]
+            BinaryFormat::Elf => self.elf_fixup_relocation(&mut relocation)?,
+            #[cfg(feature = "macho")]
+            BinaryFormat::MachO => self.macho_fixup_relocation(&mut relocation),
+            _ => unimplemented!(),
+        };
+        if addend != 0 {
+            self.write_relocation_addend(section, &relocation, addend)?;
+        }
+        self.sections[section.0].relocations.push(relocation);
+        Ok(())
+    }
+
+    fn write_relocation_addend(
+        &mut self,
+        section: SectionId,
+        relocation: &Relocation,
+        addend: i64,
+    ) -> Result<()> {
+        let data = &mut self.sections[section.0].data;
+        let offset = relocation.offset as usize;
+        match relocation.size {
+            32 => data.write_at(offset, &U32::new(self.endian, addend as u32)),
+            64 => data.write_at(offset, &U64::new(self.endian, addend as u64)),
+            _ => {
+                return Err(Error(format!(
+                    "unimplemented relocation addend {:?}",
+                    relocation
+                )));
+            }
+        }
+        .map_err(|_| {
+            Error(format!(
+                "invalid relocation offset {}+{} (max {})",
+                relocation.offset,
+                relocation.size,
+                data.len()
+            ))
+        })
+    }
+
+    /// Write the object to a `Vec`.
+    pub fn write(&self) -> Result<Vec<u8>> {
+        let mut buffer = Vec::new();
+        self.emit(&mut buffer)?;
+        Ok(buffer)
+    }
+
+    /// Write the object to a `WritableBuffer`.
+    pub fn emit(&self, buffer: &mut dyn WritableBuffer) -> Result<()> {
+        match self.format {
+            #[cfg(feature = "coff")]
+            BinaryFormat::Coff => self.coff_write(buffer),
+            #[cfg(feature = "elf")]
+            BinaryFormat::Elf => self.elf_write(buffer),
+            #[cfg(feature = "macho")]
+            BinaryFormat::MachO => self.macho_write(buffer),
+            _ => unimplemented!(),
+        }
+    }
+}
+
+/// A standard segment kind.
+#[allow(missing_docs)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[non_exhaustive]
+pub enum StandardSegment {
+    Text,
+    Data,
+    Debug,
+}
+
+/// A standard section kind.
+#[allow(missing_docs)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[non_exhaustive]
+pub enum StandardSection {
+    Text,
+    Data,
+    ReadOnlyData,
+    ReadOnlyDataWithRel,
+    ReadOnlyString,
+    UninitializedData,
+    Tls,
+    /// Zero-fill TLS initializers. Unsupported for COFF.
+    UninitializedTls,
+    /// TLS variable structures. Only supported for Mach-O.
+    TlsVariables,
+    /// Common data. Only supported for Mach-O.
+    Common,
+}
+
+impl StandardSection {
+    /// Return the section kind of a standard section.
+    pub fn kind(self) -> SectionKind {
+        match self {
+            StandardSection::Text => SectionKind::Text,
+            StandardSection::Data => SectionKind::Data,
+            StandardSection::ReadOnlyData | StandardSection::ReadOnlyDataWithRel => {
+                SectionKind::ReadOnlyData
+            }
+            StandardSection::ReadOnlyString => SectionKind::ReadOnlyString,
+            StandardSection::UninitializedData => SectionKind::UninitializedData,
+            StandardSection::Tls => SectionKind::Tls,
+            StandardSection::UninitializedTls => SectionKind::UninitializedTls,
+            StandardSection::TlsVariables => SectionKind::TlsVariables,
+            StandardSection::Common => SectionKind::Common,
+        }
+    }
+
+    // TODO: remembering to update this is error-prone, can we do better?
+    fn all() -> &'static [StandardSection] {
+        &[
+            StandardSection::Text,
+            StandardSection::Data,
+            StandardSection::ReadOnlyData,
+            StandardSection::ReadOnlyDataWithRel,
+            StandardSection::ReadOnlyString,
+            StandardSection::UninitializedData,
+            StandardSection::Tls,
+            StandardSection::UninitializedTls,
+            StandardSection::TlsVariables,
+            StandardSection::Common,
+        ]
+    }
+}
+
+/// An identifier used to reference a section.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct SectionId(usize);
+
+/// A section in an object file.
+#[derive(Debug)]
+pub struct Section {
+    segment: Vec<u8>,
+    name: Vec<u8>,
+    kind: SectionKind,
+    size: u64,
+    align: u64,
+    data: Vec<u8>,
+    relocations: Vec<Relocation>,
+    symbol: Option<SymbolId>,
+    /// Section flags that are specific to each file format.
+    pub flags: SectionFlags,
+}
+
+impl Section {
+    /// Try to convert the name to a utf8 string.
+    #[inline]
+    pub fn name(&self) -> Option<&str> {
+        str::from_utf8(&self.name).ok()
+    }
+
+    /// Try to convert the segment to a utf8 string.
+    #[inline]
+    pub fn segment(&self) -> Option<&str> {
+        str::from_utf8(&self.segment).ok()
+    }
+
+    /// Return true if this section contains zerofill data.
+    #[inline]
+    pub fn is_bss(&self) -> bool {
+        self.kind.is_bss()
+    }
+
+    /// Set the data for a section.
+    ///
+    /// Must not be called for sections that already have data, or that contain uninitialized data.
+    pub fn set_data(&mut self, data: Vec<u8>, align: u64) {
+        debug_assert!(!self.is_bss());
+        debug_assert_eq!(align & (align - 1), 0);
+        debug_assert!(self.data.is_empty());
+        self.size = data.len() as u64;
+        self.data = data;
+        self.align = align;
+    }
+
+    /// Append data to a section.
+    ///
+    /// Must not be called for sections that contain uninitialized data.
+    pub fn append_data(&mut self, data: &[u8], align: u64) -> u64 {
+        debug_assert!(!self.is_bss());
+        debug_assert_eq!(align & (align - 1), 0);
+        if self.align < align {
+            self.align = align;
+        }
+        let align = align as usize;
+        let mut offset = self.data.len();
+        if offset & (align - 1) != 0 {
+            offset += align - (offset & (align - 1));
+            self.data.resize(offset, 0);
+        }
+        self.data.extend_from_slice(data);
+        self.size = self.data.len() as u64;
+        offset as u64
+    }
+
+    /// Append unitialized data to a section.
+    ///
+    /// Must not be called for sections that contain initialized data.
+    pub fn append_bss(&mut self, size: u64, align: u64) -> u64 {
+        debug_assert!(self.is_bss());
+        debug_assert_eq!(align & (align - 1), 0);
+        if self.align < align {
+            self.align = align;
+        }
+        let mut offset = self.size;
+        if offset & (align - 1) != 0 {
+            offset += align - (offset & (align - 1));
+            self.size = offset;
+        }
+        self.size += size;
+        offset as u64
+    }
+}
+
+/// The section where a symbol is defined.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[non_exhaustive]
+pub enum SymbolSection {
+    /// The section is not applicable for this symbol (such as file symbols).
+    None,
+    /// The symbol is undefined.
+    Undefined,
+    /// The symbol has an absolute value.
+    Absolute,
+    /// The symbol is a zero-initialized symbol that will be combined with duplicate definitions.
+    Common,
+    /// The symbol is defined in the given section.
+    Section(SectionId),
+}
+
+impl SymbolSection {
+    /// Returns the section id for the section where the symbol is defined.
+    ///
+    /// May return `None` if the symbol is not defined in a section.
+    #[inline]
+    pub fn id(self) -> Option<SectionId> {
+        if let SymbolSection::Section(id) = self {
+            Some(id)
+        } else {
+            None
+        }
+    }
+}
+
+/// An identifier used to reference a symbol.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct SymbolId(usize);
+
+/// A symbol in an object file.
+#[derive(Debug)]
+pub struct Symbol {
+    /// The name of the symbol.
+    pub name: Vec<u8>,
+    /// The value of the symbol.
+    ///
+    /// If the symbol defined in a section, then this is the section offset of the symbol.
+    pub value: u64,
+    /// The size of the symbol.
+    pub size: u64,
+    /// The kind of the symbol.
+    pub kind: SymbolKind,
+    /// The scope of the symbol.
+    pub scope: SymbolScope,
+    /// Whether the symbol has weak binding.
+    pub weak: bool,
+    /// The section containing the symbol.
+    pub section: SymbolSection,
+    /// Symbol flags that are specific to each file format.
+    pub flags: SymbolFlags<SectionId>,
+}
+
+impl Symbol {
+    /// Try to convert the name to a utf8 string.
+    #[inline]
+    pub fn name(&self) -> Option<&str> {
+        str::from_utf8(&self.name).ok()
+    }
+
+    /// Return true if the symbol is undefined.
+    #[inline]
+    pub fn is_undefined(&self) -> bool {
+        self.section == SymbolSection::Undefined
+    }
+
+    /// Return true if the symbol is common data.
+    ///
+    /// Note: does not check for `SymbolSection::Section` with `SectionKind::Common`.
+    #[inline]
+    pub fn is_common(&self) -> bool {
+        self.section == SymbolSection::Common
+    }
+
+    /// Return true if the symbol scope is local.
+    #[inline]
+    pub fn is_local(&self) -> bool {
+        self.scope == SymbolScope::Compilation
+    }
+}
+
+/// A relocation in an object file.
+#[derive(Debug)]
+pub struct Relocation {
+    /// The section offset of the place of the relocation.
+    pub offset: u64,
+    /// The size in bits of the place of relocation.
+    pub size: u8,
+    /// The operation used to calculate the result of the relocation.
+    pub kind: RelocationKind,
+    /// Information about how the result of the relocation operation is encoded in the place.
+    pub encoding: RelocationEncoding,
+    /// The symbol referred to by the relocation.
+    ///
+    /// This may be a section symbol.
+    pub symbol: SymbolId,
+    /// The addend to use in the relocation calculation.
+    ///
+    /// This may be in addition to an implicit addend stored at the place of the relocation.
+    pub addend: i64,
+}
+
+/// An identifier used to reference a COMDAT section group.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct ComdatId(usize);
+
+/// A COMDAT section group.
+#[derive(Debug)]
+pub struct Comdat {
+    /// The COMDAT selection kind.
+    ///
+    /// This determines the way in which the linker resolves multiple definitions of the COMDAT
+    /// sections.
+    pub kind: ComdatKind,
+    /// The COMDAT symbol.
+    ///
+    /// If this symbol is referenced, then all sections in the group will be included by the
+    /// linker.
+    pub symbol: SymbolId,
+    /// The sections in the group.
+    pub sections: Vec<SectionId>,
+}
+
+/// The symbol name mangling scheme.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[non_exhaustive]
+pub enum Mangling {
+    /// No symbol mangling.
+    None,
+    /// Windows COFF symbol mangling.
+    Coff,
+    /// Windows COFF i386 symbol mangling.
+    CoffI386,
+    /// ELF symbol mangling.
+    Elf,
+    /// Mach-O symbol mangling.
+    MachO,
+}
+
+impl Mangling {
+    /// Return the default symboling mangling for the given format and architecture.
+    pub fn default(format: BinaryFormat, architecture: Architecture) -> Self {
+        match (format, architecture) {
+            (BinaryFormat::Coff, Architecture::I386) => Mangling::CoffI386,
+            (BinaryFormat::Coff, _) => Mangling::Coff,
+            (BinaryFormat::Elf, _) => Mangling::Elf,
+            (BinaryFormat::MachO, _) => Mangling::MachO,
+            _ => Mangling::None,
+        }
+    }
+
+    /// Return the prefix to use for global symbols.
+    pub fn global_prefix(self) -> Option<u8> {
+        match self {
+            Mangling::None | Mangling::Elf | Mangling::Coff => None,
+            Mangling::CoffI386 | Mangling::MachO => Some(b'_'),
+        }
+    }
+}
diff --git a/vendor/object-0.26.2/src/write/string.rs b/vendor/object-0.26.2/src/write/string.rs
new file mode 100644
index 000000000..c27934e60
--- /dev/null
+++ b/vendor/object-0.26.2/src/write/string.rs
@@ -0,0 +1,139 @@
+use indexmap::IndexSet;
+use std::vec::Vec;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub(crate) struct StringId(usize);
+
+#[derive(Debug, Default)]
+pub(crate) struct StringTable<'a> {
+    strings: IndexSet<&'a [u8]>,
+    offsets: Vec<usize>,
+}
+
+impl<'a> StringTable<'a> {
+    /// Add a string to the string table.
+    ///
+    /// Panics if the string table has already been written, or
+    /// if the string contains a null byte.
+    pub fn add(&mut self, string: &'a [u8]) -> StringId {
+        assert!(self.offsets.is_empty());
+        assert!(!string.contains(&0));
+        let id = self.strings.insert_full(string).0;
+        StringId(id)
+    }
+
+    /// Return the offset of the given string.
+    ///
+    /// Panics if the string table has not been written, or
+    /// if the string is not in the string table.
+    pub fn get_offset(&self, id: StringId) -> usize {
+        self.offsets[id.0]
+    }
+
+    /// Append the string table to the given `Vec`, and
+    /// calculate the list of string offsets.
+    ///
+    /// `base` is the initial string table offset. For example,
+    /// this should be 1 for ELF, to account for the initial
+    /// null byte (which must have been written by the caller).
+    pub fn write(&mut self, base: usize, w: &mut Vec<u8>) {
+        assert!(self.offsets.is_empty());
+
+        let mut ids: Vec<_> = (0..self.strings.len()).collect();
+        sort(&mut ids, 1, &self.strings);
+
+        self.offsets = vec![0; ids.len()];
+        let mut offset = base;
+        let mut previous = &[][..];
+        for id in ids {
+            let string = self.strings.get_index(id).unwrap();
+            if previous.ends_with(string) {
+                self.offsets[id] = offset - string.len() - 1;
+            } else {
+                self.offsets[id] = offset;
+                w.extend_from_slice(string);
+                w.push(0);
+                offset += string.len() + 1;
+                previous = string;
+            }
+        }
+    }
+}
+
+// Multi-key quicksort.
+//
+// Ordering is such that if a string is a suffix of at least one other string,
+// then it is placed immediately after one of those strings. That is:
+// - comparison starts at the end of the string
+// - shorter strings come later
+//
+// Based on the implementation in LLVM.
+fn sort(mut ids: &mut [usize], mut pos: usize, strings: &IndexSet<&[u8]>) {
+    loop {
+        if ids.len() <= 1 {
+            return;
+        }
+
+        let pivot = byte(ids[0], pos, strings);
+        let mut lower = 0;
+        let mut upper = ids.len();
+        let mut i = 1;
+        while i < upper {
+            let b = byte(ids[i], pos, strings);
+            if b > pivot {
+                ids.swap(lower, i);
+                lower += 1;
+                i += 1;
+            } else if b < pivot {
+                upper -= 1;
+                ids.swap(upper, i);
+            } else {
+                i += 1;
+            }
+        }
+
+        sort(&mut ids[..lower], pos, strings);
+        sort(&mut ids[upper..], pos, strings);
+
+        if pivot == 0 {
+            return;
+        }
+        ids = &mut ids[lower..upper];
+        pos += 1;
+    }
+}
+
+fn byte(id: usize, pos: usize, strings: &IndexSet<&[u8]>) -> u8 {
+    let string = strings.get_index(id).unwrap();
+    let len = string.len();
+    if len >= pos {
+        string[len - pos]
+    } else {
+        // We know the strings don't contain null bytes.
+        0
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn string_table() {
+        let mut table = StringTable::default();
+        let id0 = table.add(b"");
+        let id1 = table.add(b"foo");
+        let id2 = table.add(b"bar");
+        let id3 = table.add(b"foobar");
+
+        let mut data = Vec::new();
+        data.push(0);
+        table.write(1, &mut data);
+        assert_eq!(data, b"\0foobar\0foo\0");
+
+        assert_eq!(table.get_offset(id0), 11);
+        assert_eq!(table.get_offset(id1), 8);
+        assert_eq!(table.get_offset(id2), 4);
+        assert_eq!(table.get_offset(id3), 1);
+    }
+}
diff --git a/vendor/object-0.26.2/src/write/util.rs b/vendor/object-0.26.2/src/write/util.rs
new file mode 100644
index 000000000..bb6b8597b
--- /dev/null
+++ b/vendor/object-0.26.2/src/write/util.rs
@@ -0,0 +1,129 @@
+use std::vec::Vec;
+
+use crate::pod::{bytes_of, bytes_of_slice, Pod};
+
+/// Trait for writable buffer.
+#[allow(clippy::len_without_is_empty)]
+pub trait WritableBuffer {
+    /// Returns position/offset for data to be written at.
+    fn len(&self) -> usize;
+
+    /// Reserves specified number of bytes in the buffer.
+    fn reserve(&mut self, additional: usize) -> Result<(), ()>;
+
+    /// Writes the specified value at the end of the buffer
+    /// until the buffer has the specified length.
+    fn resize(&mut self, new_len: usize, value: u8);
+
+    /// Writes the specified slice of bytes at the end of the buffer.
+    fn write_bytes(&mut self, val: &[u8]);
+
+    /// Writes the specified `Pod` type at the end of the buffer.
+    fn write_pod<T: Pod>(&mut self, val: &T)
+    where
+        Self: Sized,
+    {
+        self.write_bytes(bytes_of(val))
+    }
+
+    /// Writes the specified `Pod` slice at the end of the buffer.
+    fn write_pod_slice<T: Pod>(&mut self, val: &[T])
+    where
+        Self: Sized,
+    {
+        self.write_bytes(bytes_of_slice(val))
+    }
+}
+
+impl<'a> dyn WritableBuffer + 'a {
+    /// Writes the specified `Pod` type at the end of the buffer.
+    pub fn write<T: Pod>(&mut self, val: &T) {
+        self.write_bytes(bytes_of(val))
+    }
+
+    /// Writes the specified `Pod` slice at the end of the buffer.
+    pub fn write_slice<T: Pod>(&mut self, val: &[T]) {
+        self.write_bytes(bytes_of_slice(val))
+    }
+}
+
+impl WritableBuffer for Vec<u8> {
+    #[inline]
+    fn len(&self) -> usize {
+        self.len()
+    }
+
+    #[inline]
+    fn reserve(&mut self, additional: usize) -> Result<(), ()> {
+        self.reserve(additional);
+        Ok(())
+    }
+
+    #[inline]
+    fn resize(&mut self, new_len: usize, value: u8) {
+        self.resize(new_len, value);
+    }
+
+    #[inline]
+    fn write_bytes(&mut self, val: &[u8]) {
+        self.extend_from_slice(val)
+    }
+}
+
+/// A trait for mutable byte slices.
+///
+/// It provides convenience methods for `Pod` types.
+pub(crate) trait BytesMut {
+    fn write_at<T: Pod>(self, offset: usize, val: &T) -> Result<(), ()>;
+}
+
+impl<'a> BytesMut for &'a mut [u8] {
+    #[inline]
+    fn write_at<T: Pod>(self, offset: usize, val: &T) -> Result<(), ()> {
+        let src = bytes_of(val);
+        let dest = self.get_mut(offset..).ok_or(())?;
+        let dest = dest.get_mut(..src.len()).ok_or(())?;
+        dest.copy_from_slice(src);
+        Ok(())
+    }
+}
+
+pub(crate) fn align(offset: usize, size: usize) -> usize {
+    (offset + (size - 1)) & !(size - 1)
+}
+
+#[allow(dead_code)]
+pub(crate) fn align_u64(offset: u64, size: u64) -> u64 {
+    (offset + (size - 1)) & !(size - 1)
+}
+
+pub(crate) fn write_align(buffer: &mut dyn WritableBuffer, size: usize) {
+    let new_len = align(buffer.len(), size);
+    buffer.resize(new_len, 0);
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn bytes_mut() {
+        let data = vec![0x01, 0x23, 0x45, 0x67];
+
+        let mut bytes = data.clone();
+        bytes.extend_from_slice(bytes_of(&u16::to_be(0x89ab)));
+        assert_eq!(bytes, [0x01, 0x23, 0x45, 0x67, 0x89, 0xab]);
+
+        let mut bytes = data.clone();
+        assert_eq!(bytes.write_at(0, &u16::to_be(0x89ab)), Ok(()));
+        assert_eq!(bytes, [0x89, 0xab, 0x45, 0x67]);
+
+        let mut bytes = data.clone();
+        assert_eq!(bytes.write_at(2, &u16::to_be(0x89ab)), Ok(()));
+        assert_eq!(bytes, [0x01, 0x23, 0x89, 0xab]);
+
+        assert_eq!(bytes.write_at(3, &u16::to_be(0x89ab)), Err(()));
+        assert_eq!(bytes.write_at(4, &u16::to_be(0x89ab)), Err(()));
+        assert_eq!(vec![].write_at(0, &u32::to_be(0x89ab)), Err(()));
+    }
+}