| 1 | use alloc::fmt; |
| 2 | use alloc::vec::Vec; |
| 3 | use core::fmt::Debug; |
| 4 | use core::slice; |
| 5 | |
| 6 | use crate::elf; |
| 7 | use crate::endian::{self, Endianness}; |
| 8 | use crate::pod::Pod; |
| 9 | use crate::read::{ |
| 10 | self, Error, ReadRef, Relocation, RelocationEncoding, RelocationFlags, RelocationKind, |
| 11 | RelocationTarget, SectionIndex, SymbolIndex, |
| 12 | }; |
| 13 | |
| 14 | use super::{ElfFile, FileHeader, SectionHeader, SectionTable}; |
| 15 | |
| 16 | /// A mapping from section index to associated relocation sections. |
| 17 | #[derive (Debug, Default)] |
| 18 | pub struct RelocationSections { |
| 19 | relocations: Vec<usize>, |
| 20 | } |
| 21 | |
| 22 | impl RelocationSections { |
| 23 | /// Create a new mapping using the section table. |
| 24 | /// |
| 25 | /// Skips relocation sections that do not use the given symbol table section. |
| 26 | pub fn parse<'data, Elf: FileHeader, R: ReadRef<'data>>( |
| 27 | endian: Elf::Endian, |
| 28 | sections: &SectionTable<'data, Elf, R>, |
| 29 | symbol_section: SectionIndex, |
| 30 | ) -> read::Result<Self> { |
| 31 | let mut relocations = vec![0; sections.len()]; |
| 32 | for (index, section) in sections.iter().enumerate().rev() { |
| 33 | let sh_type = section.sh_type(endian); |
| 34 | if sh_type == elf::SHT_REL || sh_type == elf::SHT_RELA { |
| 35 | // The symbol indices used in relocations must be for the symbol table |
| 36 | // we are expecting to use. |
| 37 | let sh_link = section.link(endian); |
| 38 | if sh_link != symbol_section { |
| 39 | continue; |
| 40 | } |
| 41 | |
| 42 | let sh_info = section.info_link(endian); |
| 43 | if sh_info == SectionIndex(0) { |
| 44 | // Skip dynamic relocations. |
| 45 | continue; |
| 46 | } |
| 47 | if sh_info.0 >= relocations.len() { |
| 48 | return Err(Error("Invalid ELF sh_info for relocation section" )); |
| 49 | } |
| 50 | |
| 51 | // We don't support relocations that apply to other relocation sections |
| 52 | // because it interferes with the chaining of relocation sections below. |
| 53 | let sh_info_type = sections.section(sh_info)?.sh_type(endian); |
| 54 | if sh_info_type == elf::SHT_REL || sh_info_type == elf::SHT_RELA { |
| 55 | return Err(Error("Unsupported ELF sh_info for relocation section" )); |
| 56 | } |
| 57 | |
| 58 | // Handle multiple relocation sections by chaining them. |
| 59 | let next = relocations[sh_info.0]; |
| 60 | relocations[sh_info.0] = index; |
| 61 | relocations[index] = next; |
| 62 | } |
| 63 | } |
| 64 | Ok(Self { relocations }) |
| 65 | } |
| 66 | |
| 67 | /// Given a section index, return the section index of the associated relocation section. |
| 68 | /// |
| 69 | /// This may also be called with a relocation section index, and it will return the |
| 70 | /// next associated relocation section. |
| 71 | pub fn get(&self, index: SectionIndex) -> Option<SectionIndex> { |
| 72 | self.relocations |
| 73 | .get(index.0) |
| 74 | .cloned() |
| 75 | .filter(|x| *x != 0) |
| 76 | .map(SectionIndex) |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | pub(super) enum ElfRelaIterator<'data, Elf: FileHeader> { |
| 81 | Rel(slice::Iter<'data, Elf::Rel>), |
| 82 | Rela(slice::Iter<'data, Elf::Rela>), |
| 83 | } |
| 84 | |
| 85 | impl<'data, Elf: FileHeader> ElfRelaIterator<'data, Elf> { |
| 86 | fn is_rel(&self) -> bool { |
| 87 | match self { |
| 88 | ElfRelaIterator::Rel(_) => true, |
| 89 | ElfRelaIterator::Rela(_) => false, |
| 90 | } |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | impl<'data, Elf: FileHeader> Iterator for ElfRelaIterator<'data, Elf> { |
| 95 | type Item = Elf::Rela; |
| 96 | |
| 97 | fn next(&mut self) -> Option<Self::Item> { |
| 98 | match self { |
| 99 | ElfRelaIterator::Rel(ref mut i: &mut Iter<'_, ::Rel>) => i.next().cloned().map(Self::Item::from), |
| 100 | ElfRelaIterator::Rela(ref mut i: &mut Iter<'_, ::Rela>) => i.next().cloned(), |
| 101 | } |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | /// An iterator for the dynamic relocations in an [`ElfFile32`](super::ElfFile32). |
| 106 | pub type ElfDynamicRelocationIterator32<'data, 'file, Endian = Endianness, R = &'data [u8]> = |
| 107 | ElfDynamicRelocationIterator<'data, 'file, elf::FileHeader32<Endian>, R>; |
| 108 | /// An iterator for the dynamic relocations in an [`ElfFile64`](super::ElfFile64). |
| 109 | pub type ElfDynamicRelocationIterator64<'data, 'file, Endian = Endianness, R = &'data [u8]> = |
| 110 | ElfDynamicRelocationIterator<'data, 'file, elf::FileHeader64<Endian>, R>; |
| 111 | |
| 112 | /// An iterator for the dynamic relocations in an [`ElfFile`]. |
| 113 | pub struct ElfDynamicRelocationIterator<'data, 'file, Elf, R = &'data [u8]> |
| 114 | where |
| 115 | Elf: FileHeader, |
| 116 | R: ReadRef<'data>, |
| 117 | { |
| 118 | /// The current relocation section index. |
| 119 | pub(super) section_index: SectionIndex, |
| 120 | pub(super) file: &'file ElfFile<'data, Elf, R>, |
| 121 | pub(super) relocations: Option<ElfRelaIterator<'data, Elf>>, |
| 122 | } |
| 123 | |
| 124 | impl<'data, 'file, Elf, R> Iterator for ElfDynamicRelocationIterator<'data, 'file, Elf, R> |
| 125 | where |
| 126 | Elf: FileHeader, |
| 127 | R: ReadRef<'data>, |
| 128 | { |
| 129 | type Item = (u64, Relocation); |
| 130 | |
| 131 | fn next(&mut self) -> Option<Self::Item> { |
| 132 | let endian = self.file.endian; |
| 133 | loop { |
| 134 | if let Some(ref mut relocations) = self.relocations { |
| 135 | if let Some(reloc) = relocations.next() { |
| 136 | let relocation = |
| 137 | parse_relocation(self.file.header, endian, reloc, relocations.is_rel()); |
| 138 | return Some((reloc.r_offset(endian).into(), relocation)); |
| 139 | } |
| 140 | self.relocations = None; |
| 141 | } |
| 142 | |
| 143 | let section = self.file.sections.section(self.section_index).ok()?; |
| 144 | self.section_index.0 += 1; |
| 145 | |
| 146 | if section.link(endian) != self.file.dynamic_symbols.section() { |
| 147 | continue; |
| 148 | } |
| 149 | |
| 150 | match section.sh_type(endian) { |
| 151 | elf::SHT_REL => { |
| 152 | if let Ok(relocations) = section.data_as_array(endian, self.file.data) { |
| 153 | self.relocations = Some(ElfRelaIterator::Rel(relocations.iter())); |
| 154 | } |
| 155 | } |
| 156 | elf::SHT_RELA => { |
| 157 | if let Ok(relocations) = section.data_as_array(endian, self.file.data) { |
| 158 | self.relocations = Some(ElfRelaIterator::Rela(relocations.iter())); |
| 159 | } |
| 160 | } |
| 161 | _ => {} |
| 162 | } |
| 163 | } |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | impl<'data, 'file, Elf, R> fmt::Debug for ElfDynamicRelocationIterator<'data, 'file, Elf, R> |
| 168 | where |
| 169 | Elf: FileHeader, |
| 170 | R: ReadRef<'data>, |
| 171 | { |
| 172 | fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| 173 | f.debug_struct(name:"ElfDynamicRelocationIterator" ).finish() |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | /// An iterator for the relocations for an [`ElfSection32`](super::ElfSection32). |
| 178 | pub type ElfSectionRelocationIterator32<'data, 'file, Endian = Endianness, R = &'data [u8]> = |
| 179 | ElfSectionRelocationIterator<'data, 'file, elf::FileHeader32<Endian>, R>; |
| 180 | /// An iterator for the relocations for an [`ElfSection64`](super::ElfSection64). |
| 181 | pub type ElfSectionRelocationIterator64<'data, 'file, Endian = Endianness, R = &'data [u8]> = |
| 182 | ElfSectionRelocationIterator<'data, 'file, elf::FileHeader64<Endian>, R>; |
| 183 | |
| 184 | /// An iterator for the relocations for an [`ElfSection`](super::ElfSection). |
| 185 | pub struct ElfSectionRelocationIterator<'data, 'file, Elf, R = &'data [u8]> |
| 186 | where |
| 187 | Elf: FileHeader, |
| 188 | R: ReadRef<'data>, |
| 189 | { |
| 190 | /// The current pointer in the chain of relocation sections. |
| 191 | pub(super) section_index: SectionIndex, |
| 192 | pub(super) file: &'file ElfFile<'data, Elf, R>, |
| 193 | pub(super) relocations: Option<ElfRelaIterator<'data, Elf>>, |
| 194 | } |
| 195 | |
| 196 | impl<'data, 'file, Elf, R> Iterator for ElfSectionRelocationIterator<'data, 'file, Elf, R> |
| 197 | where |
| 198 | Elf: FileHeader, |
| 199 | R: ReadRef<'data>, |
| 200 | { |
| 201 | type Item = (u64, Relocation); |
| 202 | |
| 203 | fn next(&mut self) -> Option<Self::Item> { |
| 204 | let endian = self.file.endian; |
| 205 | loop { |
| 206 | if let Some(ref mut relocations) = self.relocations { |
| 207 | if let Some(reloc) = relocations.next() { |
| 208 | let relocation = |
| 209 | parse_relocation(self.file.header, endian, reloc, relocations.is_rel()); |
| 210 | return Some((reloc.r_offset(endian).into(), relocation)); |
| 211 | } |
| 212 | self.relocations = None; |
| 213 | } |
| 214 | self.section_index = self.file.relocations.get(self.section_index)?; |
| 215 | // The construction of RelocationSections ensures section_index is valid. |
| 216 | let section = self.file.sections.section(self.section_index).unwrap(); |
| 217 | match section.sh_type(endian) { |
| 218 | elf::SHT_REL => { |
| 219 | if let Ok(relocations) = section.data_as_array(endian, self.file.data) { |
| 220 | self.relocations = Some(ElfRelaIterator::Rel(relocations.iter())); |
| 221 | } |
| 222 | } |
| 223 | elf::SHT_RELA => { |
| 224 | if let Ok(relocations) = section.data_as_array(endian, self.file.data) { |
| 225 | self.relocations = Some(ElfRelaIterator::Rela(relocations.iter())); |
| 226 | } |
| 227 | } |
| 228 | _ => {} |
| 229 | } |
| 230 | } |
| 231 | } |
| 232 | } |
| 233 | |
| 234 | impl<'data, 'file, Elf, R> fmt::Debug for ElfSectionRelocationIterator<'data, 'file, Elf, R> |
| 235 | where |
| 236 | Elf: FileHeader, |
| 237 | R: ReadRef<'data>, |
| 238 | { |
| 239 | fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| 240 | f.debug_struct(name:"ElfSectionRelocationIterator" ).finish() |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | fn parse_relocation<Elf: FileHeader>( |
| 245 | header: &Elf, |
| 246 | endian: Elf::Endian, |
| 247 | reloc: Elf::Rela, |
| 248 | implicit_addend: bool, |
| 249 | ) -> Relocation { |
| 250 | use RelocationEncoding as E; |
| 251 | use RelocationKind as K; |
| 252 | |
| 253 | let is_mips64el = header.is_mips64el(endian); |
| 254 | let r_type = reloc.r_type(endian, is_mips64el); |
| 255 | let flags = RelocationFlags::Elf { r_type }; |
| 256 | let g = E::Generic; |
| 257 | let unknown = (K::Unknown, E::Generic, 0); |
| 258 | let (kind, encoding, size) = match header.e_machine(endian) { |
| 259 | elf::EM_AARCH64 => { |
| 260 | if header.is_type_64() { |
| 261 | match r_type { |
| 262 | elf::R_AARCH64_ABS64 => (K::Absolute, g, 64), |
| 263 | elf::R_AARCH64_ABS32 => (K::Absolute, g, 32), |
| 264 | elf::R_AARCH64_ABS16 => (K::Absolute, g, 16), |
| 265 | elf::R_AARCH64_PREL64 => (K::Relative, g, 64), |
| 266 | elf::R_AARCH64_PREL32 => (K::Relative, g, 32), |
| 267 | elf::R_AARCH64_PREL16 => (K::Relative, g, 16), |
| 268 | elf::R_AARCH64_CALL26 => (K::PltRelative, E::AArch64Call, 26), |
| 269 | _ => unknown, |
| 270 | } |
| 271 | } else { |
| 272 | match r_type { |
| 273 | elf::R_AARCH64_P32_ABS32 => (K::Absolute, g, 32), |
| 274 | _ => unknown, |
| 275 | } |
| 276 | } |
| 277 | } |
| 278 | elf::EM_ARM => match r_type { |
| 279 | elf::R_ARM_ABS32 => (K::Absolute, g, 32), |
| 280 | _ => unknown, |
| 281 | }, |
| 282 | elf::EM_AVR => match r_type { |
| 283 | elf::R_AVR_32 => (K::Absolute, g, 32), |
| 284 | elf::R_AVR_16 => (K::Absolute, g, 16), |
| 285 | _ => unknown, |
| 286 | }, |
| 287 | elf::EM_BPF => match r_type { |
| 288 | elf::R_BPF_64_64 => (K::Absolute, g, 64), |
| 289 | elf::R_BPF_64_32 => (K::Absolute, g, 32), |
| 290 | _ => unknown, |
| 291 | }, |
| 292 | elf::EM_CSKY => match r_type { |
| 293 | elf::R_CKCORE_ADDR32 => (K::Absolute, g, 32), |
| 294 | elf::R_CKCORE_PCREL32 => (K::Relative, g, 32), |
| 295 | _ => unknown, |
| 296 | }, |
| 297 | elf::EM_MCST_ELBRUS => match r_type { |
| 298 | elf::R_E2K_32_ABS => (K::Absolute, g, 32), |
| 299 | elf::R_E2K_64_ABS => (K::Absolute, g, 64), |
| 300 | elf::R_E2K_64_ABS_LIT => (K::Absolute, E::E2KLit, 64), |
| 301 | elf::R_E2K_DISP => (K::Relative, E::E2KDisp, 28), |
| 302 | elf::R_E2K_GOT => (K::Got, g, 32), |
| 303 | _ => unknown, |
| 304 | }, |
| 305 | elf::EM_386 => match r_type { |
| 306 | elf::R_386_32 => (K::Absolute, g, 32), |
| 307 | elf::R_386_PC32 => (K::Relative, g, 32), |
| 308 | elf::R_386_GOT32 => (K::Got, g, 32), |
| 309 | elf::R_386_PLT32 => (K::PltRelative, g, 32), |
| 310 | elf::R_386_GOTOFF => (K::GotBaseOffset, g, 32), |
| 311 | elf::R_386_GOTPC => (K::GotBaseRelative, g, 32), |
| 312 | elf::R_386_16 => (K::Absolute, g, 16), |
| 313 | elf::R_386_PC16 => (K::Relative, g, 16), |
| 314 | elf::R_386_8 => (K::Absolute, g, 8), |
| 315 | elf::R_386_PC8 => (K::Relative, g, 8), |
| 316 | _ => unknown, |
| 317 | }, |
| 318 | elf::EM_X86_64 => match r_type { |
| 319 | elf::R_X86_64_64 => (K::Absolute, g, 64), |
| 320 | elf::R_X86_64_PC32 => (K::Relative, g, 32), |
| 321 | elf::R_X86_64_GOT32 => (K::Got, g, 32), |
| 322 | elf::R_X86_64_PLT32 => (K::PltRelative, g, 32), |
| 323 | elf::R_X86_64_GOTPCREL => (K::GotRelative, g, 32), |
| 324 | elf::R_X86_64_32 => (K::Absolute, g, 32), |
| 325 | elf::R_X86_64_32S => (K::Absolute, E::X86Signed, 32), |
| 326 | elf::R_X86_64_16 => (K::Absolute, g, 16), |
| 327 | elf::R_X86_64_PC16 => (K::Relative, g, 16), |
| 328 | elf::R_X86_64_8 => (K::Absolute, g, 8), |
| 329 | elf::R_X86_64_PC8 => (K::Relative, g, 8), |
| 330 | _ => unknown, |
| 331 | }, |
| 332 | elf::EM_HEXAGON => match r_type { |
| 333 | elf::R_HEX_32 => (K::Absolute, g, 32), |
| 334 | _ => unknown, |
| 335 | }, |
| 336 | elf::EM_LOONGARCH => match r_type { |
| 337 | elf::R_LARCH_32 => (K::Absolute, g, 32), |
| 338 | elf::R_LARCH_64 => (K::Absolute, g, 64), |
| 339 | elf::R_LARCH_32_PCREL => (K::Relative, g, 32), |
| 340 | elf::R_LARCH_64_PCREL => (K::Relative, g, 64), |
| 341 | elf::R_LARCH_B16 => (K::Relative, E::LoongArchBranch, 16), |
| 342 | elf::R_LARCH_B21 => (K::Relative, E::LoongArchBranch, 21), |
| 343 | elf::R_LARCH_B26 => (K::Relative, E::LoongArchBranch, 26), |
| 344 | _ => unknown, |
| 345 | }, |
| 346 | elf::EM_68K => match r_type { |
| 347 | elf::R_68K_32 => (K::Absolute, g, 32), |
| 348 | elf::R_68K_16 => (K::Absolute, g, 16), |
| 349 | elf::R_68K_8 => (K::Absolute, g, 8), |
| 350 | elf::R_68K_PC32 => (K::Relative, g, 32), |
| 351 | elf::R_68K_PC16 => (K::Relative, g, 16), |
| 352 | elf::R_68K_PC8 => (K::Relative, g, 8), |
| 353 | elf::R_68K_GOT32O => (K::Got, g, 32), |
| 354 | elf::R_68K_GOT16O => (K::Got, g, 16), |
| 355 | elf::R_68K_GOT8O => (K::Got, g, 8), |
| 356 | elf::R_68K_GOT32 => (K::GotRelative, g, 32), |
| 357 | elf::R_68K_GOT16 => (K::GotRelative, g, 16), |
| 358 | elf::R_68K_GOT8 => (K::GotRelative, g, 8), |
| 359 | elf::R_68K_PLT32 => (K::PltRelative, g, 32), |
| 360 | elf::R_68K_PLT16 => (K::PltRelative, g, 16), |
| 361 | elf::R_68K_PLT8 => (K::PltRelative, g, 8), |
| 362 | _ => unknown, |
| 363 | }, |
| 364 | elf::EM_MIPS => match r_type { |
| 365 | elf::R_MIPS_16 => (K::Absolute, g, 16), |
| 366 | elf::R_MIPS_32 => (K::Absolute, g, 32), |
| 367 | elf::R_MIPS_64 => (K::Absolute, g, 64), |
| 368 | _ => unknown, |
| 369 | }, |
| 370 | elf::EM_MSP430 => match r_type { |
| 371 | elf::R_MSP430_32 => (K::Absolute, g, 32), |
| 372 | elf::R_MSP430_16_BYTE => (K::Absolute, g, 16), |
| 373 | _ => unknown, |
| 374 | }, |
| 375 | elf::EM_PPC => match r_type { |
| 376 | elf::R_PPC_ADDR32 => (K::Absolute, g, 32), |
| 377 | _ => unknown, |
| 378 | }, |
| 379 | elf::EM_PPC64 => match r_type { |
| 380 | elf::R_PPC64_ADDR32 => (K::Absolute, g, 32), |
| 381 | elf::R_PPC64_ADDR64 => (K::Absolute, g, 64), |
| 382 | _ => unknown, |
| 383 | }, |
| 384 | elf::EM_RISCV => match r_type { |
| 385 | elf::R_RISCV_32 => (K::Absolute, g, 32), |
| 386 | elf::R_RISCV_64 => (K::Absolute, g, 64), |
| 387 | _ => unknown, |
| 388 | }, |
| 389 | elf::EM_S390 => match r_type { |
| 390 | elf::R_390_8 => (K::Absolute, g, 8), |
| 391 | elf::R_390_16 => (K::Absolute, g, 16), |
| 392 | elf::R_390_32 => (K::Absolute, g, 32), |
| 393 | elf::R_390_64 => (K::Absolute, g, 64), |
| 394 | elf::R_390_PC16 => (K::Relative, g, 16), |
| 395 | elf::R_390_PC32 => (K::Relative, g, 32), |
| 396 | elf::R_390_PC64 => (K::Relative, g, 64), |
| 397 | elf::R_390_PC16DBL => (K::Relative, E::S390xDbl, 16), |
| 398 | elf::R_390_PC32DBL => (K::Relative, E::S390xDbl, 32), |
| 399 | elf::R_390_PLT16DBL => (K::PltRelative, E::S390xDbl, 16), |
| 400 | elf::R_390_PLT32DBL => (K::PltRelative, E::S390xDbl, 32), |
| 401 | elf::R_390_GOT16 => (K::Got, g, 16), |
| 402 | elf::R_390_GOT32 => (K::Got, g, 32), |
| 403 | elf::R_390_GOT64 => (K::Got, g, 64), |
| 404 | elf::R_390_GOTENT => (K::GotRelative, E::S390xDbl, 32), |
| 405 | elf::R_390_GOTOFF16 => (K::GotBaseOffset, g, 16), |
| 406 | elf::R_390_GOTOFF32 => (K::GotBaseOffset, g, 32), |
| 407 | elf::R_390_GOTOFF64 => (K::GotBaseOffset, g, 64), |
| 408 | elf::R_390_GOTPC => (K::GotBaseRelative, g, 64), |
| 409 | elf::R_390_GOTPCDBL => (K::GotBaseRelative, E::S390xDbl, 32), |
| 410 | _ => unknown, |
| 411 | }, |
| 412 | elf::EM_SBF => match r_type { |
| 413 | elf::R_SBF_64_64 => (K::Absolute, g, 64), |
| 414 | elf::R_SBF_64_32 => (K::Absolute, g, 32), |
| 415 | _ => unknown, |
| 416 | }, |
| 417 | elf::EM_SHARC => match r_type { |
| 418 | elf::R_SHARC_ADDR24_V3 => (K::Absolute, E::SharcTypeA, 24), |
| 419 | elf::R_SHARC_ADDR32_V3 => (K::Absolute, E::SharcTypeA, 32), |
| 420 | elf::R_SHARC_ADDR_VAR_V3 => (K::Absolute, E::Generic, 32), |
| 421 | elf::R_SHARC_PCRSHORT_V3 => (K::Relative, E::SharcTypeA, 6), |
| 422 | elf::R_SHARC_PCRLONG_V3 => (K::Relative, E::SharcTypeA, 24), |
| 423 | elf::R_SHARC_DATA6_V3 => (K::Absolute, E::SharcTypeA, 6), |
| 424 | elf::R_SHARC_DATA16_V3 => (K::Absolute, E::SharcTypeA, 16), |
| 425 | elf::R_SHARC_DATA6_VISA_V3 => (K::Absolute, E::SharcTypeB, 6), |
| 426 | elf::R_SHARC_DATA7_VISA_V3 => (K::Absolute, E::SharcTypeB, 7), |
| 427 | elf::R_SHARC_DATA16_VISA_V3 => (K::Absolute, E::SharcTypeB, 16), |
| 428 | elf::R_SHARC_PCR6_VISA_V3 => (K::Relative, E::SharcTypeB, 16), |
| 429 | elf::R_SHARC_ADDR_VAR16_V3 => (K::Absolute, E::Generic, 16), |
| 430 | _ => unknown, |
| 431 | }, |
| 432 | elf::EM_SPARC | elf::EM_SPARC32PLUS | elf::EM_SPARCV9 => match r_type { |
| 433 | elf::R_SPARC_32 | elf::R_SPARC_UA32 => (K::Absolute, g, 32), |
| 434 | elf::R_SPARC_64 | elf::R_SPARC_UA64 => (K::Absolute, g, 64), |
| 435 | _ => unknown, |
| 436 | }, |
| 437 | elf::EM_XTENSA => match r_type { |
| 438 | elf::R_XTENSA_32 => (K::Absolute, g, 32), |
| 439 | elf::R_XTENSA_32_PCREL => (K::Relative, g, 32), |
| 440 | _ => unknown, |
| 441 | }, |
| 442 | _ => unknown, |
| 443 | }; |
| 444 | let target = match reloc.symbol(endian, is_mips64el) { |
| 445 | None => RelocationTarget::Absolute, |
| 446 | Some(symbol) => RelocationTarget::Symbol(symbol), |
| 447 | }; |
| 448 | Relocation { |
| 449 | kind, |
| 450 | encoding, |
| 451 | size, |
| 452 | target, |
| 453 | addend: reloc.r_addend(endian).into(), |
| 454 | implicit_addend, |
| 455 | flags, |
| 456 | } |
| 457 | } |
| 458 | |
| 459 | /// A trait for generic access to [`elf::Rel32`] and [`elf::Rel64`]. |
| 460 | #[allow (missing_docs)] |
| 461 | pub trait Rel: Debug + Pod + Clone { |
| 462 | type Word: Into<u64>; |
| 463 | type Sword: Into<i64>; |
| 464 | type Endian: endian::Endian; |
| 465 | |
| 466 | fn r_offset(&self, endian: Self::Endian) -> Self::Word; |
| 467 | fn r_info(&self, endian: Self::Endian) -> Self::Word; |
| 468 | fn r_sym(&self, endian: Self::Endian) -> u32; |
| 469 | fn r_type(&self, endian: Self::Endian) -> u32; |
| 470 | |
| 471 | /// Get the symbol index referenced by the relocation. |
| 472 | /// |
| 473 | /// Returns `None` for the null symbol index. |
| 474 | fn symbol(&self, endian: Self::Endian) -> Option<SymbolIndex> { |
| 475 | let sym: u32 = self.r_sym(endian); |
| 476 | if sym == 0 { |
| 477 | None |
| 478 | } else { |
| 479 | Some(SymbolIndex(sym as usize)) |
| 480 | } |
| 481 | } |
| 482 | } |
| 483 | |
| 484 | impl<Endian: endian::Endian> Rel for elf::Rel32<Endian> { |
| 485 | type Word = u32; |
| 486 | type Sword = i32; |
| 487 | type Endian = Endian; |
| 488 | |
| 489 | #[inline ] |
| 490 | fn r_offset(&self, endian: Self::Endian) -> Self::Word { |
| 491 | self.r_offset.get(endian) |
| 492 | } |
| 493 | |
| 494 | #[inline ] |
| 495 | fn r_info(&self, endian: Self::Endian) -> Self::Word { |
| 496 | self.r_info.get(endian) |
| 497 | } |
| 498 | |
| 499 | #[inline ] |
| 500 | fn r_sym(&self, endian: Self::Endian) -> u32 { |
| 501 | self.r_sym(endian) |
| 502 | } |
| 503 | |
| 504 | #[inline ] |
| 505 | fn r_type(&self, endian: Self::Endian) -> u32 { |
| 506 | self.r_type(endian) |
| 507 | } |
| 508 | } |
| 509 | |
| 510 | impl<Endian: endian::Endian> Rel for elf::Rel64<Endian> { |
| 511 | type Word = u64; |
| 512 | type Sword = i64; |
| 513 | type Endian = Endian; |
| 514 | |
| 515 | #[inline ] |
| 516 | fn r_offset(&self, endian: Self::Endian) -> Self::Word { |
| 517 | self.r_offset.get(endian) |
| 518 | } |
| 519 | |
| 520 | #[inline ] |
| 521 | fn r_info(&self, endian: Self::Endian) -> Self::Word { |
| 522 | self.r_info.get(endian) |
| 523 | } |
| 524 | |
| 525 | #[inline ] |
| 526 | fn r_sym(&self, endian: Self::Endian) -> u32 { |
| 527 | self.r_sym(endian) |
| 528 | } |
| 529 | |
| 530 | #[inline ] |
| 531 | fn r_type(&self, endian: Self::Endian) -> u32 { |
| 532 | self.r_type(endian) |
| 533 | } |
| 534 | } |
| 535 | |
| 536 | /// A trait for generic access to [`elf::Rela32`] and [`elf::Rela64`]. |
| 537 | #[allow (missing_docs)] |
| 538 | pub trait Rela: Debug + Pod + Clone { |
| 539 | type Word: Into<u64>; |
| 540 | type Sword: Into<i64>; |
| 541 | type Endian: endian::Endian; |
| 542 | |
| 543 | fn r_offset(&self, endian: Self::Endian) -> Self::Word; |
| 544 | fn r_info(&self, endian: Self::Endian, is_mips64el: bool) -> Self::Word; |
| 545 | fn r_addend(&self, endian: Self::Endian) -> Self::Sword; |
| 546 | fn r_sym(&self, endian: Self::Endian, is_mips64el: bool) -> u32; |
| 547 | fn r_type(&self, endian: Self::Endian, is_mips64el: bool) -> u32; |
| 548 | |
| 549 | /// Get the symbol index referenced by the relocation. |
| 550 | /// |
| 551 | /// Returns `None` for the null symbol index. |
| 552 | fn symbol(&self, endian: Self::Endian, is_mips64el: bool) -> Option<SymbolIndex> { |
| 553 | let sym: u32 = self.r_sym(endian, is_mips64el); |
| 554 | if sym == 0 { |
| 555 | None |
| 556 | } else { |
| 557 | Some(SymbolIndex(sym as usize)) |
| 558 | } |
| 559 | } |
| 560 | } |
| 561 | |
| 562 | impl<Endian: endian::Endian> Rela for elf::Rela32<Endian> { |
| 563 | type Word = u32; |
| 564 | type Sword = i32; |
| 565 | type Endian = Endian; |
| 566 | |
| 567 | #[inline ] |
| 568 | fn r_offset(&self, endian: Self::Endian) -> Self::Word { |
| 569 | self.r_offset.get(endian) |
| 570 | } |
| 571 | |
| 572 | #[inline ] |
| 573 | fn r_info(&self, endian: Self::Endian, _is_mips64el: bool) -> Self::Word { |
| 574 | self.r_info.get(endian) |
| 575 | } |
| 576 | |
| 577 | #[inline ] |
| 578 | fn r_addend(&self, endian: Self::Endian) -> Self::Sword { |
| 579 | self.r_addend.get(endian) |
| 580 | } |
| 581 | |
| 582 | #[inline ] |
| 583 | fn r_sym(&self, endian: Self::Endian, _is_mips64el: bool) -> u32 { |
| 584 | self.r_sym(endian) |
| 585 | } |
| 586 | |
| 587 | #[inline ] |
| 588 | fn r_type(&self, endian: Self::Endian, _is_mips64el: bool) -> u32 { |
| 589 | self.r_type(endian) |
| 590 | } |
| 591 | } |
| 592 | |
| 593 | impl<Endian: endian::Endian> Rela for elf::Rela64<Endian> { |
| 594 | type Word = u64; |
| 595 | type Sword = i64; |
| 596 | type Endian = Endian; |
| 597 | |
| 598 | #[inline ] |
| 599 | fn r_offset(&self, endian: Self::Endian) -> Self::Word { |
| 600 | self.r_offset.get(endian) |
| 601 | } |
| 602 | |
| 603 | #[inline ] |
| 604 | fn r_info(&self, endian: Self::Endian, is_mips64el: bool) -> Self::Word { |
| 605 | self.get_r_info(endian, is_mips64el) |
| 606 | } |
| 607 | |
| 608 | #[inline ] |
| 609 | fn r_addend(&self, endian: Self::Endian) -> Self::Sword { |
| 610 | self.r_addend.get(endian) |
| 611 | } |
| 612 | |
| 613 | #[inline ] |
| 614 | fn r_sym(&self, endian: Self::Endian, is_mips64el: bool) -> u32 { |
| 615 | self.r_sym(endian, is_mips64el) |
| 616 | } |
| 617 | |
| 618 | #[inline ] |
| 619 | fn r_type(&self, endian: Self::Endian, is_mips64el: bool) -> u32 { |
| 620 | self.r_type(endian, is_mips64el) |
| 621 | } |
| 622 | } |
| 623 | |
| 624 | /// An iterator over the relative relocations in an ELF `SHT_RELR` section. |
| 625 | /// |
| 626 | /// Returned by [`SectionHeader::relr`](super::SectionHeader::relr). |
| 627 | #[derive (Debug)] |
| 628 | pub struct RelrIterator<'data, Elf: FileHeader> { |
| 629 | offset: Elf::Word, |
| 630 | bits: Elf::Word, |
| 631 | count: u8, |
| 632 | iter: slice::Iter<'data, Elf::Relr>, |
| 633 | endian: Elf::Endian, |
| 634 | } |
| 635 | |
| 636 | impl<'data, Elf: FileHeader> RelrIterator<'data, Elf> { |
| 637 | /// Create a new iterator given the `SHT_RELR` section data. |
| 638 | pub fn new(endian: Elf::Endian, data: &'data [Elf::Relr]) -> Self { |
| 639 | RelrIterator { |
| 640 | offset: Elf::Word::default(), |
| 641 | bits: Elf::Word::default(), |
| 642 | count: 0, |
| 643 | iter: data.iter(), |
| 644 | endian, |
| 645 | } |
| 646 | } |
| 647 | } |
| 648 | |
| 649 | impl<'data, Elf: FileHeader> Iterator for RelrIterator<'data, Elf> { |
| 650 | type Item = Elf::Word; |
| 651 | |
| 652 | fn next(&mut self) -> Option<Self::Item> { |
| 653 | loop { |
| 654 | while self.count > 0 { |
| 655 | self.count -= 1; |
| 656 | let offset: Option<{unknown}> = Elf::Relr::next(&mut self.offset, &mut self.bits); |
| 657 | if offset.is_some() { |
| 658 | return offset; |
| 659 | } |
| 660 | } |
| 661 | let next = self.iter.next()?.get(self.endian); |
| 662 | if next.into() & 1 == 0 { |
| 663 | self.offset = next; |
| 664 | return Some(next); |
| 665 | } |
| 666 | self.bits = next; |
| 667 | self.count = Elf::Relr::COUNT; |
| 668 | } |
| 669 | } |
| 670 | } |
| 671 | |
| 672 | /// A trait for generic access to [`elf::Relr32`] and [`elf::Relr64`]. |
| 673 | #[allow (missing_docs)] |
| 674 | pub trait Relr: Debug + Pod + Clone { |
| 675 | type Word: Into<u64>; |
| 676 | type Endian: endian::Endian; |
| 677 | |
| 678 | /// The number of bits in the bit mask, excluding the lowest bit. |
| 679 | const COUNT: u8; |
| 680 | |
| 681 | /// Get the relocation entry. |
| 682 | /// |
| 683 | /// This value is an offset if the lowest bit is clear, or a bit mask if the lowest bit is set. |
| 684 | fn get(&self, endian: Self::Endian) -> Self::Word; |
| 685 | |
| 686 | /// Return the offset corresponding to the next bit in the bit mask. |
| 687 | /// |
| 688 | /// Updates the offset and bit mask. This method should be called 31 times |
| 689 | /// for Relr32 and 63 times for Relr64 to iterate over all the bits. |
| 690 | /// |
| 691 | /// Returns `None` if the bit is not set. |
| 692 | fn next(offset: &mut Self::Word, bits: &mut Self::Word) -> Option<Self::Word>; |
| 693 | } |
| 694 | |
| 695 | impl<Endian: endian::Endian> Relr for elf::Relr32<Endian> { |
| 696 | type Word = u32; |
| 697 | type Endian = Endian; |
| 698 | const COUNT: u8 = 31; |
| 699 | |
| 700 | fn get(&self, endian: Self::Endian) -> Self::Word { |
| 701 | self.0.get(endian) |
| 702 | } |
| 703 | |
| 704 | fn next(offset: &mut Self::Word, bits: &mut Self::Word) -> Option<Self::Word> { |
| 705 | *offset += 4; |
| 706 | *bits >>= 1; |
| 707 | if *bits & 1 != 0 { |
| 708 | Some(*offset) |
| 709 | } else { |
| 710 | None |
| 711 | } |
| 712 | } |
| 713 | } |
| 714 | |
| 715 | impl<Endian: endian::Endian> Relr for elf::Relr64<Endian> { |
| 716 | type Word = u64; |
| 717 | type Endian = Endian; |
| 718 | const COUNT: u8 = 63; |
| 719 | |
| 720 | fn get(&self, endian: Self::Endian) -> Self::Word { |
| 721 | self.0.get(endian) |
| 722 | } |
| 723 | |
| 724 | fn next(offset: &mut Self::Word, bits: &mut Self::Word) -> Option<Self::Word> { |
| 725 | *offset += 8; |
| 726 | *bits >>= 1; |
| 727 | if *bits & 1 != 0 { |
| 728 | Some(*offset) |
| 729 | } else { |
| 730 | None |
| 731 | } |
| 732 | } |
| 733 | } |
| 734 | |