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681 lines
17 KiB
681 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* This is included from relocs_32/64.c */ |
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#define ElfW(type) _ElfW(ELF_BITS, type) |
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#define _ElfW(bits, type) __ElfW(bits, type) |
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#define __ElfW(bits, type) Elf##bits##_##type |
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#define Elf_Addr ElfW(Addr) |
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#define Elf_Ehdr ElfW(Ehdr) |
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#define Elf_Phdr ElfW(Phdr) |
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#define Elf_Shdr ElfW(Shdr) |
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#define Elf_Sym ElfW(Sym) |
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static Elf_Ehdr ehdr; |
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struct relocs { |
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uint32_t *offset; |
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unsigned long count; |
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unsigned long size; |
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}; |
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static struct relocs relocs; |
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struct section { |
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Elf_Shdr shdr; |
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struct section *link; |
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Elf_Sym *symtab; |
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Elf_Rel *reltab; |
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char *strtab; |
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long shdr_offset; |
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}; |
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static struct section *secs; |
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static const char * const regex_sym_kernel = { |
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/* Symbols matching these regex's should never be relocated */ |
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"^(__crc_)", |
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}; |
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static regex_t sym_regex_c; |
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static int regex_skip_reloc(const char *sym_name) |
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{ |
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return !regexec(&sym_regex_c, sym_name, 0, NULL, 0); |
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} |
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static void regex_init(void) |
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{ |
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char errbuf[128]; |
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int err; |
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err = regcomp(&sym_regex_c, regex_sym_kernel, |
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REG_EXTENDED|REG_NOSUB); |
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if (err) { |
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regerror(err, &sym_regex_c, errbuf, sizeof(errbuf)); |
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die("%s", errbuf); |
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} |
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} |
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static const char *rel_type(unsigned type) |
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{ |
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static const char * const type_name[] = { |
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#define REL_TYPE(X)[X] = #X |
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REL_TYPE(R_MIPS_NONE), |
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REL_TYPE(R_MIPS_16), |
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REL_TYPE(R_MIPS_32), |
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REL_TYPE(R_MIPS_REL32), |
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REL_TYPE(R_MIPS_26), |
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REL_TYPE(R_MIPS_HI16), |
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REL_TYPE(R_MIPS_LO16), |
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REL_TYPE(R_MIPS_GPREL16), |
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REL_TYPE(R_MIPS_LITERAL), |
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REL_TYPE(R_MIPS_GOT16), |
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REL_TYPE(R_MIPS_PC16), |
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REL_TYPE(R_MIPS_CALL16), |
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REL_TYPE(R_MIPS_GPREL32), |
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REL_TYPE(R_MIPS_64), |
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REL_TYPE(R_MIPS_HIGHER), |
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REL_TYPE(R_MIPS_HIGHEST), |
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REL_TYPE(R_MIPS_PC21_S2), |
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REL_TYPE(R_MIPS_PC26_S2), |
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#undef REL_TYPE |
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}; |
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const char *name = "unknown type rel type name"; |
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if (type < ARRAY_SIZE(type_name) && type_name[type]) |
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name = type_name[type]; |
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return name; |
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} |
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static const char *sec_name(unsigned shndx) |
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{ |
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const char *sec_strtab; |
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const char *name; |
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sec_strtab = secs[ehdr.e_shstrndx].strtab; |
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if (shndx < ehdr.e_shnum) |
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name = sec_strtab + secs[shndx].shdr.sh_name; |
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else if (shndx == SHN_ABS) |
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name = "ABSOLUTE"; |
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else if (shndx == SHN_COMMON) |
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name = "COMMON"; |
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else |
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name = "<noname>"; |
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return name; |
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} |
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static struct section *sec_lookup(const char *secname) |
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{ |
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int i; |
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for (i = 0; i < ehdr.e_shnum; i++) |
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if (strcmp(secname, sec_name(i)) == 0) |
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return &secs[i]; |
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return NULL; |
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} |
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static const char *sym_name(const char *sym_strtab, Elf_Sym *sym) |
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{ |
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const char *name; |
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if (sym->st_name) |
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name = sym_strtab + sym->st_name; |
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else |
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name = sec_name(sym->st_shndx); |
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return name; |
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} |
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#if BYTE_ORDER == LITTLE_ENDIAN |
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#define le16_to_cpu(val) (val) |
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#define le32_to_cpu(val) (val) |
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#define le64_to_cpu(val) (val) |
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#define be16_to_cpu(val) bswap_16(val) |
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#define be32_to_cpu(val) bswap_32(val) |
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#define be64_to_cpu(val) bswap_64(val) |
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#define cpu_to_le16(val) (val) |
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#define cpu_to_le32(val) (val) |
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#define cpu_to_le64(val) (val) |
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#define cpu_to_be16(val) bswap_16(val) |
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#define cpu_to_be32(val) bswap_32(val) |
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#define cpu_to_be64(val) bswap_64(val) |
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#endif |
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#if BYTE_ORDER == BIG_ENDIAN |
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#define le16_to_cpu(val) bswap_16(val) |
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#define le32_to_cpu(val) bswap_32(val) |
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#define le64_to_cpu(val) bswap_64(val) |
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#define be16_to_cpu(val) (val) |
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#define be32_to_cpu(val) (val) |
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#define be64_to_cpu(val) (val) |
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#define cpu_to_le16(val) bswap_16(val) |
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#define cpu_to_le32(val) bswap_32(val) |
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#define cpu_to_le64(val) bswap_64(val) |
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#define cpu_to_be16(val) (val) |
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#define cpu_to_be32(val) (val) |
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#define cpu_to_be64(val) (val) |
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#endif |
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static uint16_t elf16_to_cpu(uint16_t val) |
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{ |
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if (ehdr.e_ident[EI_DATA] == ELFDATA2LSB) |
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return le16_to_cpu(val); |
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else |
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return be16_to_cpu(val); |
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} |
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static uint32_t elf32_to_cpu(uint32_t val) |
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{ |
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if (ehdr.e_ident[EI_DATA] == ELFDATA2LSB) |
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return le32_to_cpu(val); |
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else |
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return be32_to_cpu(val); |
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} |
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static uint32_t cpu_to_elf32(uint32_t val) |
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{ |
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if (ehdr.e_ident[EI_DATA] == ELFDATA2LSB) |
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return cpu_to_le32(val); |
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else |
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return cpu_to_be32(val); |
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} |
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#define elf_half_to_cpu(x) elf16_to_cpu(x) |
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#define elf_word_to_cpu(x) elf32_to_cpu(x) |
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#if ELF_BITS == 64 |
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static uint64_t elf64_to_cpu(uint64_t val) |
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{ |
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if (ehdr.e_ident[EI_DATA] == ELFDATA2LSB) |
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return le64_to_cpu(val); |
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else |
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return be64_to_cpu(val); |
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} |
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#define elf_addr_to_cpu(x) elf64_to_cpu(x) |
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#define elf_off_to_cpu(x) elf64_to_cpu(x) |
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#define elf_xword_to_cpu(x) elf64_to_cpu(x) |
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#else |
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#define elf_addr_to_cpu(x) elf32_to_cpu(x) |
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#define elf_off_to_cpu(x) elf32_to_cpu(x) |
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#define elf_xword_to_cpu(x) elf32_to_cpu(x) |
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#endif |
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static void read_ehdr(FILE *fp) |
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{ |
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if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1) |
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die("Cannot read ELF header: %s\n", strerror(errno)); |
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if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0) |
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die("No ELF magic\n"); |
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if (ehdr.e_ident[EI_CLASS] != ELF_CLASS) |
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die("Not a %d bit executable\n", ELF_BITS); |
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if ((ehdr.e_ident[EI_DATA] != ELFDATA2LSB) && |
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(ehdr.e_ident[EI_DATA] != ELFDATA2MSB)) |
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die("Unknown ELF Endianness\n"); |
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if (ehdr.e_ident[EI_VERSION] != EV_CURRENT) |
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die("Unknown ELF version\n"); |
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/* Convert the fields to native endian */ |
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ehdr.e_type = elf_half_to_cpu(ehdr.e_type); |
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ehdr.e_machine = elf_half_to_cpu(ehdr.e_machine); |
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ehdr.e_version = elf_word_to_cpu(ehdr.e_version); |
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ehdr.e_entry = elf_addr_to_cpu(ehdr.e_entry); |
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ehdr.e_phoff = elf_off_to_cpu(ehdr.e_phoff); |
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ehdr.e_shoff = elf_off_to_cpu(ehdr.e_shoff); |
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ehdr.e_flags = elf_word_to_cpu(ehdr.e_flags); |
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ehdr.e_ehsize = elf_half_to_cpu(ehdr.e_ehsize); |
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ehdr.e_phentsize = elf_half_to_cpu(ehdr.e_phentsize); |
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ehdr.e_phnum = elf_half_to_cpu(ehdr.e_phnum); |
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ehdr.e_shentsize = elf_half_to_cpu(ehdr.e_shentsize); |
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ehdr.e_shnum = elf_half_to_cpu(ehdr.e_shnum); |
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ehdr.e_shstrndx = elf_half_to_cpu(ehdr.e_shstrndx); |
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if ((ehdr.e_type != ET_EXEC) && (ehdr.e_type != ET_DYN)) |
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die("Unsupported ELF header type\n"); |
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if (ehdr.e_machine != ELF_MACHINE) |
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die("Not for %s\n", ELF_MACHINE_NAME); |
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if (ehdr.e_version != EV_CURRENT) |
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die("Unknown ELF version\n"); |
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if (ehdr.e_ehsize != sizeof(Elf_Ehdr)) |
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die("Bad Elf header size\n"); |
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if (ehdr.e_phentsize != sizeof(Elf_Phdr)) |
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die("Bad program header entry\n"); |
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if (ehdr.e_shentsize != sizeof(Elf_Shdr)) |
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die("Bad section header entry\n"); |
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if (ehdr.e_shstrndx >= ehdr.e_shnum) |
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die("String table index out of bounds\n"); |
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} |
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static void read_shdrs(FILE *fp) |
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{ |
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int i; |
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Elf_Shdr shdr; |
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secs = calloc(ehdr.e_shnum, sizeof(struct section)); |
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if (!secs) |
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die("Unable to allocate %d section headers\n", ehdr.e_shnum); |
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if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0) |
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die("Seek to %d failed: %s\n", ehdr.e_shoff, strerror(errno)); |
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for (i = 0; i < ehdr.e_shnum; i++) { |
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struct section *sec = &secs[i]; |
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sec->shdr_offset = ftell(fp); |
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if (fread(&shdr, sizeof(shdr), 1, fp) != 1) |
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die("Cannot read ELF section headers %d/%d: %s\n", |
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i, ehdr.e_shnum, strerror(errno)); |
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sec->shdr.sh_name = elf_word_to_cpu(shdr.sh_name); |
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sec->shdr.sh_type = elf_word_to_cpu(shdr.sh_type); |
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sec->shdr.sh_flags = elf_xword_to_cpu(shdr.sh_flags); |
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sec->shdr.sh_addr = elf_addr_to_cpu(shdr.sh_addr); |
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sec->shdr.sh_offset = elf_off_to_cpu(shdr.sh_offset); |
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sec->shdr.sh_size = elf_xword_to_cpu(shdr.sh_size); |
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sec->shdr.sh_link = elf_word_to_cpu(shdr.sh_link); |
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sec->shdr.sh_info = elf_word_to_cpu(shdr.sh_info); |
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sec->shdr.sh_addralign = elf_xword_to_cpu(shdr.sh_addralign); |
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sec->shdr.sh_entsize = elf_xword_to_cpu(shdr.sh_entsize); |
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if (sec->shdr.sh_link < ehdr.e_shnum) |
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sec->link = &secs[sec->shdr.sh_link]; |
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} |
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} |
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static void read_strtabs(FILE *fp) |
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{ |
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int i; |
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for (i = 0; i < ehdr.e_shnum; i++) { |
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struct section *sec = &secs[i]; |
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if (sec->shdr.sh_type != SHT_STRTAB) |
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continue; |
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sec->strtab = malloc(sec->shdr.sh_size); |
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if (!sec->strtab) |
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die("malloc of %d bytes for strtab failed\n", |
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sec->shdr.sh_size); |
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if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) |
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die("Seek to %d failed: %s\n", |
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sec->shdr.sh_offset, strerror(errno)); |
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if (fread(sec->strtab, 1, sec->shdr.sh_size, fp) != |
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sec->shdr.sh_size) |
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die("Cannot read symbol table: %s\n", strerror(errno)); |
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} |
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} |
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static void read_symtabs(FILE *fp) |
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{ |
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int i, j; |
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for (i = 0; i < ehdr.e_shnum; i++) { |
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struct section *sec = &secs[i]; |
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if (sec->shdr.sh_type != SHT_SYMTAB) |
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continue; |
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sec->symtab = malloc(sec->shdr.sh_size); |
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if (!sec->symtab) |
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die("malloc of %d bytes for symtab failed\n", |
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sec->shdr.sh_size); |
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if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) |
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die("Seek to %d failed: %s\n", |
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sec->shdr.sh_offset, strerror(errno)); |
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if (fread(sec->symtab, 1, sec->shdr.sh_size, fp) != |
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sec->shdr.sh_size) |
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die("Cannot read symbol table: %s\n", strerror(errno)); |
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for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Sym); j++) { |
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Elf_Sym *sym = &sec->symtab[j]; |
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sym->st_name = elf_word_to_cpu(sym->st_name); |
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sym->st_value = elf_addr_to_cpu(sym->st_value); |
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sym->st_size = elf_xword_to_cpu(sym->st_size); |
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sym->st_shndx = elf_half_to_cpu(sym->st_shndx); |
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} |
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} |
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} |
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static void read_relocs(FILE *fp) |
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{ |
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static unsigned long base = 0; |
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int i, j; |
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if (!base) { |
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struct section *sec = sec_lookup(".text"); |
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if (!sec) |
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die("Could not find .text section\n"); |
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base = sec->shdr.sh_addr; |
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} |
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for (i = 0; i < ehdr.e_shnum; i++) { |
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struct section *sec = &secs[i]; |
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if (sec->shdr.sh_type != SHT_REL_TYPE) |
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continue; |
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sec->reltab = malloc(sec->shdr.sh_size); |
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if (!sec->reltab) |
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die("malloc of %d bytes for relocs failed\n", |
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sec->shdr.sh_size); |
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if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) |
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die("Seek to %d failed: %s\n", |
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sec->shdr.sh_offset, strerror(errno)); |
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if (fread(sec->reltab, 1, sec->shdr.sh_size, fp) != |
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sec->shdr.sh_size) |
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die("Cannot read symbol table: %s\n", strerror(errno)); |
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for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) { |
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Elf_Rel *rel = &sec->reltab[j]; |
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rel->r_offset = elf_addr_to_cpu(rel->r_offset); |
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/* Set offset into kernel image */ |
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rel->r_offset -= base; |
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#if (ELF_BITS == 32) |
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rel->r_info = elf_xword_to_cpu(rel->r_info); |
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#else |
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/* Convert MIPS64 RELA format - only the symbol |
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* index needs converting to native endianness |
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*/ |
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rel->r_info = rel->r_info; |
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ELF_R_SYM(rel->r_info) = elf32_to_cpu(ELF_R_SYM(rel->r_info)); |
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#endif |
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#if (SHT_REL_TYPE == SHT_RELA) |
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rel->r_addend = elf_xword_to_cpu(rel->r_addend); |
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#endif |
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} |
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} |
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} |
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static void remove_relocs(FILE *fp) |
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{ |
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int i; |
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Elf_Shdr shdr; |
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for (i = 0; i < ehdr.e_shnum; i++) { |
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struct section *sec = &secs[i]; |
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if (sec->shdr.sh_type != SHT_REL_TYPE) |
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continue; |
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if (fseek(fp, sec->shdr_offset, SEEK_SET) < 0) |
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die("Seek to %d failed: %s\n", |
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sec->shdr_offset, strerror(errno)); |
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if (fread(&shdr, sizeof(shdr), 1, fp) != 1) |
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die("Cannot read ELF section headers %d/%d: %s\n", |
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i, ehdr.e_shnum, strerror(errno)); |
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/* Set relocation section size to 0, effectively removing it. |
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* This is necessary due to lack of support for relocations |
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* in objcopy when creating 32bit elf from 64bit elf. |
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*/ |
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shdr.sh_size = 0; |
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if (fseek(fp, sec->shdr_offset, SEEK_SET) < 0) |
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die("Seek to %d failed: %s\n", |
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sec->shdr_offset, strerror(errno)); |
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if (fwrite(&shdr, sizeof(shdr), 1, fp) != 1) |
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die("Cannot write ELF section headers %d/%d: %s\n", |
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i, ehdr.e_shnum, strerror(errno)); |
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} |
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} |
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static void add_reloc(struct relocs *r, uint32_t offset, unsigned type) |
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{ |
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/* Relocation representation in binary table: |
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* |76543210|76543210|76543210|76543210| |
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* | Type | offset from _text >> 2 | |
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*/ |
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offset >>= 2; |
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if (offset > 0x00FFFFFF) |
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die("Kernel image exceeds maximum size for relocation!\n"); |
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offset = (offset & 0x00FFFFFF) | ((type & 0xFF) << 24); |
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if (r->count == r->size) { |
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unsigned long newsize = r->size + 50000; |
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void *mem = realloc(r->offset, newsize * sizeof(r->offset[0])); |
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if (!mem) |
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die("realloc failed\n"); |
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r->offset = mem; |
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r->size = newsize; |
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} |
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r->offset[r->count++] = offset; |
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} |
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static void walk_relocs(int (*process)(struct section *sec, Elf_Rel *rel, |
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Elf_Sym *sym, const char *symname)) |
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{ |
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int i; |
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/* Walk through the relocations */ |
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for (i = 0; i < ehdr.e_shnum; i++) { |
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char *sym_strtab; |
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Elf_Sym *sh_symtab; |
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struct section *sec_applies, *sec_symtab; |
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int j; |
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struct section *sec = &secs[i]; |
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if (sec->shdr.sh_type != SHT_REL_TYPE) |
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continue; |
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sec_symtab = sec->link; |
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sec_applies = &secs[sec->shdr.sh_info]; |
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if (!(sec_applies->shdr.sh_flags & SHF_ALLOC)) |
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continue; |
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sh_symtab = sec_symtab->symtab; |
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sym_strtab = sec_symtab->link->strtab; |
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for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) { |
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Elf_Rel *rel = &sec->reltab[j]; |
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Elf_Sym *sym = &sh_symtab[ELF_R_SYM(rel->r_info)]; |
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const char *symname = sym_name(sym_strtab, sym); |
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process(sec, rel, sym, symname); |
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} |
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} |
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} |
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static int do_reloc(struct section *sec, Elf_Rel *rel, Elf_Sym *sym, |
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const char *symname) |
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{ |
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unsigned r_type = ELF_R_TYPE(rel->r_info); |
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unsigned bind = ELF_ST_BIND(sym->st_info); |
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if ((bind == STB_WEAK) && (sym->st_value == 0)) { |
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/* Don't relocate weak symbols without a target */ |
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return 0; |
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} |
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if (regex_skip_reloc(symname)) |
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return 0; |
|
|
|
switch (r_type) { |
|
case R_MIPS_NONE: |
|
case R_MIPS_REL32: |
|
case R_MIPS_PC16: |
|
case R_MIPS_PC21_S2: |
|
case R_MIPS_PC26_S2: |
|
/* |
|
* NONE can be ignored and PC relative relocations don't |
|
* need to be adjusted. |
|
*/ |
|
case R_MIPS_HIGHEST: |
|
case R_MIPS_HIGHER: |
|
/* We support relocating within the same 4Gb segment only, |
|
* thus leaving the top 32bits unchanged |
|
*/ |
|
case R_MIPS_LO16: |
|
/* We support relocating by 64k jumps only |
|
* thus leaving the bottom 16bits unchanged |
|
*/ |
|
break; |
|
|
|
case R_MIPS_64: |
|
case R_MIPS_32: |
|
case R_MIPS_26: |
|
case R_MIPS_HI16: |
|
add_reloc(&relocs, rel->r_offset, r_type); |
|
break; |
|
|
|
default: |
|
die("Unsupported relocation type: %s (%d)\n", |
|
rel_type(r_type), r_type); |
|
break; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int write_reloc_as_bin(uint32_t v, FILE *f) |
|
{ |
|
unsigned char buf[4]; |
|
|
|
v = cpu_to_elf32(v); |
|
|
|
memcpy(buf, &v, sizeof(uint32_t)); |
|
return fwrite(buf, 1, 4, f); |
|
} |
|
|
|
static int write_reloc_as_text(uint32_t v, FILE *f) |
|
{ |
|
int res; |
|
|
|
res = fprintf(f, "\t.long 0x%08"PRIx32"\n", v); |
|
if (res < 0) |
|
return res; |
|
else |
|
return sizeof(uint32_t); |
|
} |
|
|
|
static void emit_relocs(int as_text, int as_bin, FILE *outf) |
|
{ |
|
int i; |
|
int (*write_reloc)(uint32_t, FILE *) = write_reloc_as_bin; |
|
int size = 0; |
|
int size_reserved; |
|
struct section *sec_reloc; |
|
|
|
sec_reloc = sec_lookup(".data.reloc"); |
|
if (!sec_reloc) |
|
die("Could not find relocation section\n"); |
|
|
|
size_reserved = sec_reloc->shdr.sh_size; |
|
|
|
/* Collect up the relocations */ |
|
walk_relocs(do_reloc); |
|
|
|
/* Print the relocations */ |
|
if (as_text) { |
|
/* Print the relocations in a form suitable that |
|
* gas will like. |
|
*/ |
|
printf(".section \".data.reloc\",\"a\"\n"); |
|
printf(".balign 4\n"); |
|
/* Output text to stdout */ |
|
write_reloc = write_reloc_as_text; |
|
outf = stdout; |
|
} else if (as_bin) { |
|
/* Output raw binary to stdout */ |
|
outf = stdout; |
|
} else { |
|
/* Seek to offset of the relocation section. |
|
* Each relocation is then written into the |
|
* vmlinux kernel image. |
|
*/ |
|
if (fseek(outf, sec_reloc->shdr.sh_offset, SEEK_SET) < 0) { |
|
die("Seek to %d failed: %s\n", |
|
sec_reloc->shdr.sh_offset, strerror(errno)); |
|
} |
|
} |
|
|
|
for (i = 0; i < relocs.count; i++) |
|
size += write_reloc(relocs.offset[i], outf); |
|
|
|
/* Print a stop, but only if we've actually written some relocs */ |
|
if (size) |
|
size += write_reloc(0, outf); |
|
|
|
if (size > size_reserved) |
|
/* Die, but suggest a value for CONFIG_RELOCATION_TABLE_SIZE |
|
* which will fix this problem and allow a bit of headroom |
|
* if more kernel features are enabled |
|
*/ |
|
die("Relocations overflow available space!\n" \ |
|
"Please adjust CONFIG_RELOCATION_TABLE_SIZE " \ |
|
"to at least 0x%08x\n", (size + 0x1000) & ~0xFFF); |
|
} |
|
|
|
/* |
|
* As an aid to debugging problems with different linkers |
|
* print summary information about the relocs. |
|
* Since different linkers tend to emit the sections in |
|
* different orders we use the section names in the output. |
|
*/ |
|
static int do_reloc_info(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym, |
|
const char *symname) |
|
{ |
|
printf("%16s 0x%08x %16s %40s %16s\n", |
|
sec_name(sec->shdr.sh_info), |
|
(unsigned int)rel->r_offset, |
|
rel_type(ELF_R_TYPE(rel->r_info)), |
|
symname, |
|
sec_name(sym->st_shndx)); |
|
return 0; |
|
} |
|
|
|
static void print_reloc_info(void) |
|
{ |
|
printf("%16s %10s %16s %40s %16s\n", |
|
"reloc section", |
|
"offset", |
|
"reloc type", |
|
"symbol", |
|
"symbol section"); |
|
walk_relocs(do_reloc_info); |
|
} |
|
|
|
#if ELF_BITS == 64 |
|
# define process process_64 |
|
#else |
|
# define process process_32 |
|
#endif |
|
|
|
void process(FILE *fp, int as_text, int as_bin, |
|
int show_reloc_info, int keep_relocs) |
|
{ |
|
regex_init(); |
|
read_ehdr(fp); |
|
read_shdrs(fp); |
|
read_strtabs(fp); |
|
read_symtabs(fp); |
|
read_relocs(fp); |
|
if (show_reloc_info) { |
|
print_reloc_info(); |
|
return; |
|
} |
|
emit_relocs(as_text, as_bin, fp); |
|
if (!keep_relocs) |
|
remove_relocs(fp); |
|
}
|
|
|