| 1 | /* |
| 2 | * SPDX-License-Identifier: LGPL-2.1-or-later |
| 3 | * |
| 4 | * Copyright (C) 2015 Antoine Busque <abusque@efficios.com> |
| 5 | */ |
| 6 | |
| 7 | #ifndef _LIB_LTTNG_UST_ELF_H |
| 8 | #define _LIB_LTTNG_UST_ELF_H |
| 9 | |
| 10 | #include <elf.h> |
| 11 | #include <lttng/ust-endian.h> |
| 12 | |
| 13 | /* |
| 14 | * Determine native endianness in order to convert when reading an ELF |
| 15 | * file if there is a mismatch. |
| 16 | */ |
| 17 | #if BYTE_ORDER == LITTLE_ENDIAN |
| 18 | #define NATIVE_ELF_ENDIANNESS ELFDATA2LSB |
| 19 | #else |
| 20 | #define NATIVE_ELF_ENDIANNESS ELFDATA2MSB |
| 21 | #endif |
| 22 | |
| 23 | /* |
| 24 | * The size in bytes of the debug link CRC as contained in an ELF |
| 25 | * section. |
| 26 | */ |
| 27 | #define ELF_CRC_SIZE 4 |
| 28 | /* |
| 29 | * ELF notes are aligned on 4 bytes. ref: ELF specification version |
| 30 | * 1.1 p. 2-5. |
| 31 | */ |
| 32 | #define ELF_NOTE_ENTRY_ALIGN 4 |
| 33 | /* |
| 34 | * Within an ELF note, the `desc` field is also aligned on 4 |
| 35 | * bytes. ref: ELF specification version 1.1 p. 2-5. |
| 36 | */ |
| 37 | #define ELF_NOTE_DESC_ALIGN 4 |
| 38 | |
| 39 | #define bswap(x) \ |
| 40 | do { \ |
| 41 | switch (sizeof(x)) { \ |
| 42 | case 8: \ |
| 43 | x = bswap_64(x); \ |
| 44 | break; \ |
| 45 | case 4: \ |
| 46 | x = bswap_32(x); \ |
| 47 | break; \ |
| 48 | case 2: \ |
| 49 | x = bswap_16(x); \ |
| 50 | break; \ |
| 51 | case 1: \ |
| 52 | break; \ |
| 53 | default: \ |
| 54 | abort(); \ |
| 55 | } \ |
| 56 | } while (0) |
| 57 | |
| 58 | #define bswap_phdr(phdr) \ |
| 59 | do { \ |
| 60 | bswap((phdr).p_type); \ |
| 61 | bswap((phdr).p_offset); \ |
| 62 | bswap((phdr).p_filesz); \ |
| 63 | bswap((phdr).p_memsz); \ |
| 64 | bswap((phdr).p_align); \ |
| 65 | bswap((phdr).p_vaddr); \ |
| 66 | } while (0) |
| 67 | |
| 68 | #define bswap_shdr(shdr) \ |
| 69 | do { \ |
| 70 | bswap((shdr).sh_name); \ |
| 71 | bswap((shdr).sh_type); \ |
| 72 | bswap((shdr).sh_flags); \ |
| 73 | bswap((shdr).sh_addr); \ |
| 74 | bswap((shdr).sh_offset); \ |
| 75 | bswap((shdr).sh_size); \ |
| 76 | bswap((shdr).sh_link); \ |
| 77 | bswap((shdr).sh_info); \ |
| 78 | bswap((shdr).sh_addralign); \ |
| 79 | bswap((shdr).sh_entsize); \ |
| 80 | } while (0) |
| 81 | |
| 82 | #define bswap_ehdr(ehdr) \ |
| 83 | do { \ |
| 84 | bswap((ehdr).e_type); \ |
| 85 | bswap((ehdr).e_machine); \ |
| 86 | bswap((ehdr).e_version); \ |
| 87 | bswap((ehdr).e_entry); \ |
| 88 | bswap((ehdr).e_phoff); \ |
| 89 | bswap((ehdr).e_shoff); \ |
| 90 | bswap((ehdr).e_flags); \ |
| 91 | bswap((ehdr).e_ehsize); \ |
| 92 | bswap((ehdr).e_phentsize); \ |
| 93 | bswap((ehdr).e_phnum); \ |
| 94 | bswap((ehdr).e_shentsize); \ |
| 95 | bswap((ehdr).e_shnum); \ |
| 96 | bswap((ehdr).e_shstrndx); \ |
| 97 | } while (0) |
| 98 | |
| 99 | #define copy_phdr(src_phdr, dst_phdr) \ |
| 100 | do { \ |
| 101 | (dst_phdr).p_type = (src_phdr).p_type; \ |
| 102 | (dst_phdr).p_offset = (src_phdr).p_offset; \ |
| 103 | (dst_phdr).p_filesz = (src_phdr).p_filesz; \ |
| 104 | (dst_phdr).p_memsz = (src_phdr).p_memsz; \ |
| 105 | (dst_phdr).p_align = (src_phdr).p_align; \ |
| 106 | (dst_phdr).p_vaddr = (src_phdr).p_vaddr; \ |
| 107 | } while (0) |
| 108 | |
| 109 | #define copy_shdr(src_shdr, dst_shdr) \ |
| 110 | do { \ |
| 111 | (dst_shdr).sh_name = (src_shdr).sh_name; \ |
| 112 | (dst_shdr).sh_type = (src_shdr).sh_type; \ |
| 113 | (dst_shdr).sh_flags = (src_shdr).sh_flags; \ |
| 114 | (dst_shdr).sh_addr = (src_shdr).sh_addr; \ |
| 115 | (dst_shdr).sh_offset = (src_shdr).sh_offset; \ |
| 116 | (dst_shdr).sh_size = (src_shdr).sh_size; \ |
| 117 | (dst_shdr).sh_link = (src_shdr).sh_link; \ |
| 118 | (dst_shdr).sh_info = (src_shdr).sh_info; \ |
| 119 | (dst_shdr).sh_addralign = (src_shdr).sh_addralign; \ |
| 120 | (dst_shdr).sh_entsize = (src_shdr).sh_entsize; \ |
| 121 | } while (0) |
| 122 | |
| 123 | #define copy_ehdr(src_ehdr, dst_ehdr) \ |
| 124 | do { \ |
| 125 | (dst_ehdr).e_type = (src_ehdr).e_type; \ |
| 126 | (dst_ehdr).e_machine = (src_ehdr).e_machine; \ |
| 127 | (dst_ehdr).e_version = (src_ehdr).e_version; \ |
| 128 | (dst_ehdr).e_entry = (src_ehdr).e_entry; \ |
| 129 | (dst_ehdr).e_phoff = (src_ehdr).e_phoff; \ |
| 130 | (dst_ehdr).e_shoff = (src_ehdr).e_shoff; \ |
| 131 | (dst_ehdr).e_flags = (src_ehdr).e_flags; \ |
| 132 | (dst_ehdr).e_ehsize = (src_ehdr).e_ehsize; \ |
| 133 | (dst_ehdr).e_phentsize = (src_ehdr).e_phentsize; \ |
| 134 | (dst_ehdr).e_phnum = (src_ehdr).e_phnum; \ |
| 135 | (dst_ehdr).e_shentsize = (src_ehdr).e_shentsize; \ |
| 136 | (dst_ehdr).e_shnum = (src_ehdr).e_shnum; \ |
| 137 | (dst_ehdr).e_shstrndx = (src_ehdr).e_shstrndx; \ |
| 138 | } while (0) |
| 139 | |
| 140 | static inline |
| 141 | int is_elf_32_bit(struct lttng_ust_elf *elf) |
| 142 | { |
| 143 | return elf->bitness == ELFCLASS32; |
| 144 | } |
| 145 | |
| 146 | static inline |
| 147 | int is_elf_native_endian(struct lttng_ust_elf *elf) |
| 148 | { |
| 149 | return elf->endianness == NATIVE_ELF_ENDIANNESS; |
| 150 | } |
| 151 | |
| 152 | #endif |