diff options
Diffstat (limited to 'vendor/object/src/write/coff/object.rs')
| -rw-r--r-- | vendor/object/src/write/coff/object.rs | 583 |
1 files changed, 0 insertions, 583 deletions
diff --git a/vendor/object/src/write/coff/object.rs b/vendor/object/src/write/coff/object.rs deleted file mode 100644 index 5229665..0000000 --- a/vendor/object/src/write/coff/object.rs +++ /dev/null @@ -1,583 +0,0 @@ -use alloc::vec::Vec; - -use crate::pe as coff; -use crate::write::coff::writer; -use crate::write::util::*; -use crate::write::*; - -#[derive(Default, Clone, Copy)] -struct SectionOffsets { - name: writer::Name, - offset: u32, - reloc_offset: u32, - selection: u8, - associative_section: u32, -} - -#[derive(Default, Clone, Copy)] -struct SymbolOffsets { - name: writer::Name, - index: u32, - aux_count: u8, -} - -/// Internal format to use for the `.drectve` section containing linker -/// directives for symbol exports. -#[derive(Clone, Copy, Debug, PartialEq, Eq)] -pub enum CoffExportStyle { - /// MSVC format supported by link.exe and LLD. - Msvc, - /// Gnu format supported by GNU LD and LLD. - Gnu, -} - -impl<'a> Object<'a> { - pub(crate) fn coff_section_info( - &self, - section: StandardSection, - ) -> (&'static [u8], &'static [u8], SectionKind, SectionFlags) { - match section { - StandardSection::Text => (&[], &b".text"[..], SectionKind::Text, SectionFlags::None), - StandardSection::Data => (&[], &b".data"[..], SectionKind::Data, SectionFlags::None), - StandardSection::ReadOnlyData - | StandardSection::ReadOnlyDataWithRel - | StandardSection::ReadOnlyString => ( - &[], - &b".rdata"[..], - SectionKind::ReadOnlyData, - SectionFlags::None, - ), - StandardSection::UninitializedData => ( - &[], - &b".bss"[..], - SectionKind::UninitializedData, - SectionFlags::None, - ), - // TLS sections are data sections with a special name. - StandardSection::Tls => (&[], &b".tls$"[..], SectionKind::Data, SectionFlags::None), - StandardSection::UninitializedTls => { - // Unsupported section. - (&[], &[], SectionKind::UninitializedTls, SectionFlags::None) - } - StandardSection::TlsVariables => { - // Unsupported section. - (&[], &[], SectionKind::TlsVariables, SectionFlags::None) - } - StandardSection::Common => { - // Unsupported section. - (&[], &[], SectionKind::Common, SectionFlags::None) - } - StandardSection::GnuProperty => { - // Unsupported section. - (&[], &[], SectionKind::Note, SectionFlags::None) - } - } - } - - pub(crate) fn coff_subsection_name(&self, section: &[u8], value: &[u8]) -> Vec<u8> { - let mut name = section.to_vec(); - name.push(b'$'); - name.extend_from_slice(value); - name - } - - pub(crate) fn coff_fixup_relocation(&mut self, 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 | Architecture::Arm | Architecture::Aarch64 => match relocation.kind - { - RelocationKind::Relative => { - // IMAGE_REL_I386_REL32, IMAGE_REL_ARM_REL32, IMAGE_REL_ARM64_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 name = b".rdata$.refptr".to_vec(); - 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 - } - - /// Appends linker directives to the `.drectve` section to tell the linker - /// to export all symbols with `SymbolScope::Dynamic`. - /// - /// This must be called after all symbols have been defined. - pub fn add_coff_exports(&mut self, style: CoffExportStyle) { - assert_eq!(self.format, BinaryFormat::Coff); - - let mut directives = vec![]; - for symbol in &self.symbols { - if symbol.scope == SymbolScope::Dynamic { - match style { - CoffExportStyle::Msvc => directives.extend(b" /EXPORT:\""), - CoffExportStyle::Gnu => directives.extend(b" -export:\""), - } - directives.extend(&symbol.name); - directives.extend(b"\""); - if symbol.kind != SymbolKind::Text { - match style { - CoffExportStyle::Msvc => directives.extend(b",DATA"), - CoffExportStyle::Gnu => directives.extend(b",data"), - } - } - } - } - let drectve = self.add_section(vec![], b".drectve".to_vec(), SectionKind::Linker); - self.append_section_data(drectve, &directives, 1); - } - - pub(crate) fn coff_write(&self, buffer: &mut dyn WritableBuffer) -> Result<()> { - let mut writer = writer::Writer::new(buffer); - - // Add section strings to strtab. - let mut section_offsets = vec![SectionOffsets::default(); self.sections.len()]; - for (index, section) in self.sections.iter().enumerate() { - section_offsets[index].name = writer.add_name(§ion.name); - } - - // 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 u32 + 1; - } - } - } - - // Reserve symbol indices and add symbol strings to strtab. - let mut symbol_offsets = vec![SymbolOffsets::default(); self.symbols.len()]; - for (index, symbol) in self.symbols.iter().enumerate() { - symbol_offsets[index].index = writer.reserve_symbol_index(); - let mut name = &*symbol.name; - match symbol.kind { - SymbolKind::File => { - // Name goes in auxiliary symbol records. - symbol_offsets[index].aux_count = writer.reserve_aux_file_name(&symbol.name); - name = b".file"; - } - SymbolKind::Section if symbol.section.id().is_some() => { - symbol_offsets[index].aux_count = writer.reserve_aux_section(); - } - _ => {} - }; - symbol_offsets[index].name = writer.add_name(name); - } - - // Reserve file ranges. - writer.reserve_file_header(); - writer.reserve_section_headers(self.sections.len() as u16); - for (index, section) in self.sections.iter().enumerate() { - section_offsets[index].offset = writer.reserve_section(section.data.len()); - section_offsets[index].reloc_offset = - writer.reserve_relocations(section.relocations.len()); - } - writer.reserve_symtab_strtab(); - - // Start writing. - writer.write_file_header(writer::FileHeader { - machine: match (self.architecture, self.sub_architecture) { - (Architecture::Arm, None) => coff::IMAGE_FILE_MACHINE_ARMNT, - (Architecture::Aarch64, None) => coff::IMAGE_FILE_MACHINE_ARM64, - (Architecture::Aarch64, Some(SubArchitecture::Arm64EC)) => { - coff::IMAGE_FILE_MACHINE_ARM64EC - } - (Architecture::I386, None) => coff::IMAGE_FILE_MACHINE_I386, - (Architecture::X86_64, None) => coff::IMAGE_FILE_MACHINE_AMD64, - _ => { - return Err(Error(format!( - "unimplemented architecture {:?} with sub-architecture {:?}", - self.architecture, self.sub_architecture - ))); - } - }, - time_date_stamp: 0, - characteristics: match self.flags { - FileFlags::Coff { characteristics } => characteristics, - _ => 0, - }, - })?; - - // Write section headers. - for (index, section) in self.sections.iter().enumerate() { - let mut characteristics = if let SectionFlags::Coff { - characteristics, .. - } = section.flags - { - characteristics - } else { - 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::ReadOnlyDataWithRel - | 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 - ))); - } - } - }; - if section_offsets[index].selection != 0 { - characteristics |= coff::IMAGE_SCN_LNK_COMDAT; - }; - if section.relocations.len() > 0xffff { - characteristics |= coff::IMAGE_SCN_LNK_NRELOC_OVFL; - } - characteristics |= 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 - ))); - } - }; - writer.write_section_header(writer::SectionHeader { - name: section_offsets[index].name, - size_of_raw_data: section.size as u32, - pointer_to_raw_data: section_offsets[index].offset, - pointer_to_relocations: section_offsets[index].reloc_offset, - pointer_to_linenumbers: 0, - number_of_relocations: section.relocations.len() as u32, - number_of_linenumbers: 0, - characteristics, - }); - } - - // Write section data and relocations. - for section in &self.sections { - writer.write_section(§ion.data); - - if !section.relocations.is_empty() { - //debug_assert_eq!(section_offsets[index].reloc_offset, buffer.len()); - writer.write_relocations_count(section.relocations.len()); - for reloc in §ion.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))); - } - }, - Architecture::Arm => match (reloc.kind, reloc.size, reloc.addend) { - (RelocationKind::Absolute, 32, 0) => coff::IMAGE_REL_ARM_ADDR32, - (RelocationKind::ImageOffset, 32, 0) => coff::IMAGE_REL_ARM_ADDR32NB, - (RelocationKind::Relative, 32, -4) => coff::IMAGE_REL_ARM_REL32, - (RelocationKind::SectionIndex, 16, 0) => coff::IMAGE_REL_ARM_SECTION, - (RelocationKind::SectionOffset, 32, 0) => coff::IMAGE_REL_ARM_SECREL, - (RelocationKind::Coff(x), _, _) => x, - _ => { - return Err(Error(format!("unimplemented relocation {:?}", reloc))); - } - }, - Architecture::Aarch64 => match (reloc.kind, reloc.size, reloc.addend) { - (RelocationKind::Absolute, 32, 0) => coff::IMAGE_REL_ARM64_ADDR32, - (RelocationKind::ImageOffset, 32, 0) => coff::IMAGE_REL_ARM64_ADDR32NB, - (RelocationKind::SectionIndex, 16, 0) => coff::IMAGE_REL_ARM64_SECTION, - (RelocationKind::SectionOffset, 32, 0) => coff::IMAGE_REL_ARM64_SECREL, - (RelocationKind::Absolute, 64, 0) => coff::IMAGE_REL_ARM64_ADDR64, - (RelocationKind::Relative, 32, -4) => coff::IMAGE_REL_ARM64_REL32, - (RelocationKind::Coff(x), _, _) => x, - _ => { - return Err(Error(format!("unimplemented relocation {:?}", reloc))); - } - }, - _ => { - return Err(Error(format!( - "unimplemented architecture {:?}", - self.architecture - ))); - } - }; - writer.write_relocation(writer::Relocation { - virtual_address: reloc.offset as u32, - symbol: symbol_offsets[reloc.symbol.0].index, - typ, - }); - } - } - } - - // Write symbols. - for (index, symbol) in self.symbols.iter().enumerate() { - let section_number = match symbol.section { - SymbolSection::None => { - debug_assert_eq!(symbol.kind, SymbolKind::File); - coff::IMAGE_SYM_DEBUG as u16 - } - SymbolSection::Undefined => coff::IMAGE_SYM_UNDEFINED as u16, - SymbolSection::Absolute => coff::IMAGE_SYM_ABSOLUTE as u16, - SymbolSection::Common => coff::IMAGE_SYM_UNDEFINED as u16, - 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 => coff::IMAGE_SYM_CLASS_FILE, - SymbolKind::Section => { - if symbol.section.id().is_some() { - coff::IMAGE_SYM_CLASS_STATIC - } else { - coff::IMAGE_SYM_CLASS_SECTION - } - } - 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 - }; - writer.write_symbol(writer::Symbol { - name: symbol_offsets[index].name, - value, - section_number, - typ, - storage_class, - number_of_aux_symbols, - }); - - // Write auxiliary symbols. - match symbol.kind { - SymbolKind::File => { - writer.write_aux_file_name(&symbol.name, number_of_aux_symbols); - } - SymbolKind::Section if symbol.section.id().is_some() => { - debug_assert_eq!(number_of_aux_symbols, 1); - let section_index = symbol.section.id().unwrap().0; - let section = &self.sections[section_index]; - writer.write_aux_section(writer::AuxSymbolSection { - length: section.size as u32, - number_of_relocations: section.relocations.len() as u32, - number_of_linenumbers: 0, - check_sum: checksum(section.data()), - number: section_offsets[section_index].associative_section, - selection: section_offsets[section_index].selection, - }); - } - _ => { - debug_assert_eq!(number_of_aux_symbols, 0); - } - } - } - - writer.write_strtab(); - - debug_assert_eq!(writer.reserved_len(), writer.len()); - - Ok(()) - } -} - -// JamCRC -fn checksum(data: &[u8]) -> u32 { - let mut hasher = crc32fast::Hasher::new_with_initial(0xffff_ffff); - hasher.update(data); - !hasher.finalize() -} |