682 lines
17 KiB
C
682 lines
17 KiB
C
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// 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++) {
|
||
|
|
Elf_Sym *sym = &sec->symtab[j];
|
||
|
|
|
||
|
|
sym->st_name = elf_word_to_cpu(sym->st_name);
|
||
|
|
sym->st_value = elf_addr_to_cpu(sym->st_value);
|
||
|
|
sym->st_size = elf_xword_to_cpu(sym->st_size);
|
||
|
|
sym->st_shndx = elf_half_to_cpu(sym->st_shndx);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void read_relocs(FILE *fp)
|
||
|
|
{
|
||
|
|
static unsigned long base;
|
||
|
|
int i, j;
|
||
|
|
|
||
|
|
if (!base) {
|
||
|
|
struct section *sec = sec_lookup(".text");
|
||
|
|
|
||
|
|
if (!sec)
|
||
|
|
die("Could not find .text section\n");
|
||
|
|
|
||
|
|
base = sec->shdr.sh_addr;
|
||
|
|
}
|
||
|
|
|
||
|
|
for (i = 0; i < ehdr.e_shnum; i++) {
|
||
|
|
struct section *sec = &secs[i];
|
||
|
|
|
||
|
|
if (sec->shdr.sh_type != SHT_REL_TYPE)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
sec->reltab = malloc(sec->shdr.sh_size);
|
||
|
|
if (!sec->reltab)
|
||
|
|
die("malloc of %d bytes for relocs failed\n",
|
||
|
|
sec->shdr.sh_size);
|
||
|
|
|
||
|
|
if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0)
|
||
|
|
die("Seek to %d failed: %s\n",
|
||
|
|
sec->shdr.sh_offset, strerror(errno));
|
||
|
|
|
||
|
|
if (fread(sec->reltab, 1, sec->shdr.sh_size, fp) !=
|
||
|
|
sec->shdr.sh_size)
|
||
|
|
die("Cannot read symbol table: %s\n", strerror(errno));
|
||
|
|
|
||
|
|
for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) {
|
||
|
|
Elf_Rel *rel = &sec->reltab[j];
|
||
|
|
|
||
|
|
rel->r_offset = elf_addr_to_cpu(rel->r_offset);
|
||
|
|
/* Set offset into kernel image */
|
||
|
|
rel->r_offset -= base;
|
||
|
|
#if (ELF_BITS == 32)
|
||
|
|
rel->r_info = elf_xword_to_cpu(rel->r_info);
|
||
|
|
#else
|
||
|
|
/* Convert MIPS64 RELA format - only the symbol
|
||
|
|
* index needs converting to native endianness
|
||
|
|
*/
|
||
|
|
rel->r_info = rel->r_info;
|
||
|
|
ELF_R_SYM(rel->r_info) = elf32_to_cpu(ELF_R_SYM(rel->r_info));
|
||
|
|
#endif
|
||
|
|
#if (SHT_REL_TYPE == SHT_RELA)
|
||
|
|
rel->r_addend = elf_xword_to_cpu(rel->r_addend);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void remove_relocs(FILE *fp)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
Elf_Shdr shdr;
|
||
|
|
|
||
|
|
for (i = 0; i < ehdr.e_shnum; i++) {
|
||
|
|
struct section *sec = &secs[i];
|
||
|
|
|
||
|
|
if (sec->shdr.sh_type != SHT_REL_TYPE)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
if (fseek(fp, sec->shdr_offset, SEEK_SET) < 0)
|
||
|
|
die("Seek to %d failed: %s\n",
|
||
|
|
sec->shdr_offset, strerror(errno));
|
||
|
|
|
||
|
|
if (fread(&shdr, sizeof(shdr), 1, fp) != 1)
|
||
|
|
die("Cannot read ELF section headers %d/%d: %s\n",
|
||
|
|
i, ehdr.e_shnum, strerror(errno));
|
||
|
|
|
||
|
|
/* Set relocation section size to 0, effectively removing it.
|
||
|
|
* This is necessary due to lack of support for relocations
|
||
|
|
* in objcopy when creating 32bit elf from 64bit elf.
|
||
|
|
*/
|
||
|
|
shdr.sh_size = 0;
|
||
|
|
|
||
|
|
if (fseek(fp, sec->shdr_offset, SEEK_SET) < 0)
|
||
|
|
die("Seek to %d failed: %s\n",
|
||
|
|
sec->shdr_offset, strerror(errno));
|
||
|
|
|
||
|
|
if (fwrite(&shdr, sizeof(shdr), 1, fp) != 1)
|
||
|
|
die("Cannot write ELF section headers %d/%d: %s\n",
|
||
|
|
i, ehdr.e_shnum, strerror(errno));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void add_reloc(struct relocs *r, uint32_t offset, unsigned type)
|
||
|
|
{
|
||
|
|
/* Relocation representation in binary table:
|
||
|
|
* |76543210|76543210|76543210|76543210|
|
||
|
|
* | Type | offset from _text >> 2 |
|
||
|
|
*/
|
||
|
|
offset >>= 2;
|
||
|
|
if (offset > 0x00FFFFFF)
|
||
|
|
die("Kernel image exceeds maximum size for relocation!\n");
|
||
|
|
|
||
|
|
offset = (offset & 0x00FFFFFF) | ((type & 0xFF) << 24);
|
||
|
|
|
||
|
|
if (r->count == r->size) {
|
||
|
|
unsigned long newsize = r->size + 50000;
|
||
|
|
void *mem = realloc(r->offset, newsize * sizeof(r->offset[0]));
|
||
|
|
|
||
|
|
if (!mem)
|
||
|
|
die("realloc failed\n");
|
||
|
|
|
||
|
|
r->offset = mem;
|
||
|
|
r->size = newsize;
|
||
|
|
}
|
||
|
|
r->offset[r->count++] = offset;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void walk_relocs(int (*process)(struct section *sec, Elf_Rel *rel,
|
||
|
|
Elf_Sym *sym, const char *symname))
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
|
||
|
|
/* Walk through the relocations */
|
||
|
|
for (i = 0; i < ehdr.e_shnum; i++) {
|
||
|
|
char *sym_strtab;
|
||
|
|
Elf_Sym *sh_symtab;
|
||
|
|
struct section *sec_applies, *sec_symtab;
|
||
|
|
int j;
|
||
|
|
struct section *sec = &secs[i];
|
||
|
|
|
||
|
|
if (sec->shdr.sh_type != SHT_REL_TYPE)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
sec_symtab = sec->link;
|
||
|
|
sec_applies = &secs[sec->shdr.sh_info];
|
||
|
|
if (!(sec_applies->shdr.sh_flags & SHF_ALLOC))
|
||
|
|
continue;
|
||
|
|
|
||
|
|
sh_symtab = sec_symtab->symtab;
|
||
|
|
sym_strtab = sec_symtab->link->strtab;
|
||
|
|
for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) {
|
||
|
|
Elf_Rel *rel = &sec->reltab[j];
|
||
|
|
Elf_Sym *sym = &sh_symtab[ELF_R_SYM(rel->r_info)];
|
||
|
|
const char *symname = sym_name(sym_strtab, sym);
|
||
|
|
|
||
|
|
process(sec, rel, sym, symname);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static int do_reloc(struct section *sec, Elf_Rel *rel, Elf_Sym *sym,
|
||
|
|
const char *symname)
|
||
|
|
{
|
||
|
|
unsigned r_type = ELF_R_TYPE(rel->r_info);
|
||
|
|
unsigned bind = ELF_ST_BIND(sym->st_info);
|
||
|
|
|
||
|
|
if ((bind == STB_WEAK) && (sym->st_value == 0)) {
|
||
|
|
/* Don't relocate weak symbols without a target */
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (regex_skip_reloc(symname))
|
||
|
|
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);
|
||
|
|
}
|