* @brief 构造函数 * @param elf_addr elf 地址 */
| 40 | * @param elf_addr elf 地址 |
| 41 | */ |
| 42 | explicit KernelElf(uint64_t elf_addr) { |
| 43 | assert(elf_addr != 0U && "elf_addr is null"); |
| 44 | |
| 45 | elf_ = std::span<uint8_t>(reinterpret_cast<uint8_t*>(elf_addr), EI_NIDENT); |
| 46 | |
| 47 | // 检查 elf 头数据 |
| 48 | CheckElfIdentity().or_else([](Error err) -> Expected<void> { |
| 49 | klog::Err("KernelElf NOT valid ELF file: {}", err.message()); |
| 50 | while (true) { |
| 51 | cpu_io::Pause(); |
| 52 | } |
| 53 | return {}; |
| 54 | }); |
| 55 | |
| 56 | ehdr_ = *reinterpret_cast<const Elf64_Ehdr*>(elf_.data()); |
| 57 | |
| 58 | // 重新计算 elf 大小 |
| 59 | size_t max_size = EI_NIDENT; |
| 60 | if (ehdr_.e_phoff != 0) { |
| 61 | size_t ph_end = ehdr_.e_phoff + ehdr_.e_phnum * ehdr_.e_phentsize; |
| 62 | if (ph_end > max_size) { |
| 63 | max_size = ph_end; |
| 64 | } |
| 65 | } |
| 66 | if (ehdr_.e_shoff != 0) { |
| 67 | size_t sh_end = ehdr_.e_shoff + ehdr_.e_shnum * ehdr_.e_shentsize; |
| 68 | if (sh_end > max_size) { |
| 69 | max_size = sh_end; |
| 70 | } |
| 71 | const auto* shdrs = |
| 72 | reinterpret_cast<const Elf64_Shdr*>(elf_.data() + ehdr_.e_shoff); |
| 73 | for (int i = 0; i < ehdr_.e_shnum; ++i) { |
| 74 | size_t section_end = shdrs[i].sh_offset + shdrs[i].sh_size; |
| 75 | if (section_end > max_size) { |
| 76 | max_size = section_end; |
| 77 | } |
| 78 | } |
| 79 | } |
| 80 | elf_ = std::span<uint8_t>(reinterpret_cast<uint8_t*>(elf_addr), max_size); |
| 81 | |
| 82 | phdr_ = std::span<Elf64_Phdr>( |
| 83 | reinterpret_cast<Elf64_Phdr*>(elf_.data() + ehdr_.e_phoff), |
| 84 | ehdr_.e_phnum); |
| 85 | |
| 86 | shdr_ = std::span<Elf64_Shdr>( |
| 87 | reinterpret_cast<Elf64_Shdr*>(elf_.data() + ehdr_.e_shoff), |
| 88 | ehdr_.e_shnum); |
| 89 | |
| 90 | const auto* shstrtab = reinterpret_cast<const char*>(elf_.data()) + |
| 91 | shdr_[ehdr_.e_shstrndx].sh_offset; |
| 92 | for (auto shdr : shdr_) { |
| 93 | if (strcmp(shstrtab + shdr.sh_name, ".symtab") == 0) { |
| 94 | symtab = std::span<Elf64_Sym>( |
| 95 | reinterpret_cast<Elf64_Sym*>(elf_.data() + shdr.sh_offset), |
| 96 | (shdr.sh_size / sizeof(Elf64_Sym))); |
| 97 | } else if (strcmp(shstrtab + shdr.sh_name, ".strtab") == 0) { |
| 98 | strtab = elf_.data() + shdr.sh_offset; |
| 99 | } |