/* This is included from relocs_32/64.c */
  
  #define ElfW(type)		_ElfW(ELF_BITS, type)
  #define _ElfW(bits, type)	__ElfW(bits, type)
  #define __ElfW(bits, type)	Elf##bits##_##type
  
  #define Elf_Addr		ElfW(Addr)
  #define Elf_Ehdr		ElfW(Ehdr)
  #define Elf_Phdr		ElfW(Phdr)
  #define Elf_Shdr		ElfW(Shdr)
  #define Elf_Sym			ElfW(Sym)
  
  static Elf_Ehdr ehdr;
  
  struct relocs {
  	uint32_t	*offset;
  	unsigned long	count;
  	unsigned long	size;
  };
  
  static struct relocs relocs16;
  static struct relocs relocs32;
  static struct relocs relocs64;
  
  struct section {
  	Elf_Shdr       shdr;
  	struct section *link;
  	Elf_Sym        *symtab;
  	Elf_Rel        *reltab;
  	char           *strtab;
  };
  static struct section *secs;
  
  static const char * const sym_regex_kernel[S_NSYMTYPES] = {
  /*
   * Following symbols have been audited. There values are constant and do
   * not change if bzImage is loaded at a different physical address than
   * the address for which it has been compiled. Don't warn user about
   * absolute relocations present w.r.t these symbols.
   */
  	[S_ABS] =
  	"^(xen_irq_disable_direct_reloc$|"
  	"xen_save_fl_direct_reloc$|"
  	"VDSO|"
  	"__crc_)",
  
  /*
   * These symbols are known to be relative, even if the linker marks them
   * as absolute (typically defined outside any section in the linker script.)
   */
  	[S_REL] =
  	"^(__init_(begin|end)|"
  	"__x86_cpu_dev_(start|end)|"
  	"(__parainstructions|__alt_instructions)(|_end)|"
  	"(__iommu_table|__apicdrivers|__smp_locks)(|_end)|"
  	"__(start|end)_pci_.*|"
  	"__(start|end)_builtin_fw|"
  	"__(start|stop)___ksymtab(|_gpl|_unused|_unused_gpl|_gpl_future)|"
  	"__(start|stop)___kcrctab(|_gpl|_unused|_unused_gpl|_gpl_future)|"
  	"__(start|stop)___param|"
  	"__(start|stop)___modver|"
  	"__(start|stop)___bug_table|"
  	"__tracedata_(start|end)|"
  	"__(start|stop)_notes|"
  	"__end_rodata|"
  	"__initramfs_start|"
  	"(jiffies|jiffies_64)|"
  #if ELF_BITS == 64
  	"__per_cpu_load|"
  	"init_per_cpu__.*|"
  	"__end_rodata_hpage_align|"
  	"__vvar_page|"
  #endif
  	"_end)$"
  };
  
  
  static const char * const sym_regex_realmode[S_NSYMTYPES] = {
  /*
   * These symbols are known to be relative, even if the linker marks them
   * as absolute (typically defined outside any section in the linker script.)
   */
  	[S_REL] =
  	"^pa_",
  
  /*
   * These are 16-bit segment symbols when compiling 16-bit code.
   */
  	[S_SEG] =
  	"^real_mode_seg$",
  
  /*
   * These are offsets belonging to segments, as opposed to linear addresses,
   * when compiling 16-bit code.
   */
  	[S_LIN] =
  	"^pa_",
  };
  
  static const char * const *sym_regex;
  
  static regex_t sym_regex_c[S_NSYMTYPES];
  static int is_reloc(enum symtype type, const char *sym_name)
  {
  	return sym_regex[type] &&
  		!regexec(&sym_regex_c[type], sym_name, 0, NULL, 0);
  }
  
  static void regex_init(int use_real_mode)
  {
          char errbuf[128];
          int err;
  	int i;
  
  	if (use_real_mode)
  		sym_regex = sym_regex_realmode;
  	else
  		sym_regex = sym_regex_kernel;
  
  	for (i = 0; i < S_NSYMTYPES; i++) {
  		if (!sym_regex[i])
  			continue;
  
  		err = regcomp(&sym_regex_c[i], sym_regex[i],
  			      REG_EXTENDED|REG_NOSUB);
  
  		if (err) {
  			regerror(err, &sym_regex_c[i], errbuf, sizeof errbuf);
  			die("%s", errbuf);
  		}
          }
  }
  
  static const char *sym_type(unsigned type)
  {
  	static const char *type_name[] = {
  #define SYM_TYPE(X) [X] = #X
  		SYM_TYPE(STT_NOTYPE),
  		SYM_TYPE(STT_OBJECT),
  		SYM_TYPE(STT_FUNC),
  		SYM_TYPE(STT_SECTION),
  		SYM_TYPE(STT_FILE),
  		SYM_TYPE(STT_COMMON),
  		SYM_TYPE(STT_TLS),
  #undef SYM_TYPE
  	};
  	const char *name = "unknown sym type name";
  	if (type < ARRAY_SIZE(type_name)) {
  		name = type_name[type];
  	}
  	return name;
  }
  
  static const char *sym_bind(unsigned bind)
  {
  	static const char *bind_name[] = {
  #define SYM_BIND(X) [X] = #X
  		SYM_BIND(STB_LOCAL),
  		SYM_BIND(STB_GLOBAL),
  		SYM_BIND(STB_WEAK),
  #undef SYM_BIND
  	};
  	const char *name = "unknown sym bind name";
  	if (bind < ARRAY_SIZE(bind_name)) {
  		name = bind_name[bind];
  	}
  	return name;
  }
  
  static const char *sym_visibility(unsigned visibility)
  {
  	static const char *visibility_name[] = {
  #define SYM_VISIBILITY(X) [X] = #X
  		SYM_VISIBILITY(STV_DEFAULT),
  		SYM_VISIBILITY(STV_INTERNAL),
  		SYM_VISIBILITY(STV_HIDDEN),
  		SYM_VISIBILITY(STV_PROTECTED),
  #undef SYM_VISIBILITY
  	};
  	const char *name = "unknown sym visibility name";
  	if (visibility < ARRAY_SIZE(visibility_name)) {
  		name = visibility_name[visibility];
  	}
  	return name;
  }
  
  static const char *rel_type(unsigned type)
  {
  	static const char *type_name[] = {
  #define REL_TYPE(X) [X] = #X
  #if ELF_BITS == 64
  		REL_TYPE(R_X86_64_NONE),
  		REL_TYPE(R_X86_64_64),
  		REL_TYPE(R_X86_64_PC32),
  		REL_TYPE(R_X86_64_GOT32),
  		REL_TYPE(R_X86_64_PLT32),
  		REL_TYPE(R_X86_64_COPY),
  		REL_TYPE(R_X86_64_GLOB_DAT),
  		REL_TYPE(R_X86_64_JUMP_SLOT),
  		REL_TYPE(R_X86_64_RELATIVE),
  		REL_TYPE(R_X86_64_GOTPCREL),
  		REL_TYPE(R_X86_64_32),
  		REL_TYPE(R_X86_64_32S),
  		REL_TYPE(R_X86_64_16),
  		REL_TYPE(R_X86_64_PC16),
  		REL_TYPE(R_X86_64_8),
  		REL_TYPE(R_X86_64_PC8),
  #else
  		REL_TYPE(R_386_NONE),
  		REL_TYPE(R_386_32),
  		REL_TYPE(R_386_PC32),
  		REL_TYPE(R_386_GOT32),
  		REL_TYPE(R_386_PLT32),
  		REL_TYPE(R_386_COPY),
  		REL_TYPE(R_386_GLOB_DAT),
  		REL_TYPE(R_386_JMP_SLOT),
  		REL_TYPE(R_386_RELATIVE),
  		REL_TYPE(R_386_GOTOFF),
  		REL_TYPE(R_386_GOTPC),
  		REL_TYPE(R_386_8),
  		REL_TYPE(R_386_PC8),
  		REL_TYPE(R_386_16),
  		REL_TYPE(R_386_PC16),
  #endif
  #undef REL_TYPE
  	};
  	const char *name = "unknown type rel type name";
  	if (type < ARRAY_SIZE(type_name) && type_name[type]) {
  		name = type_name[type];
  	}
  	return name;
  }
  
  static const char *sec_name(unsigned shndx)
  {
  	const char *sec_strtab;
  	const char *name;
  	sec_strtab = secs[ehdr.e_shstrndx].strtab;
  	name = "<noname>";
  	if (shndx < ehdr.e_shnum) {
  		name = sec_strtab + secs[shndx].shdr.sh_name;
  	}
  	else if (shndx == SHN_ABS) {
  		name = "ABSOLUTE";
  	}
  	else if (shndx == SHN_COMMON) {
  		name = "COMMON";
  	}
  	return name;
  }
  
  static const char *sym_name(const char *sym_strtab, Elf_Sym *sym)
  {
  	const char *name;
  	name = "<noname>";
  	if (sym->st_name) {
  		name = sym_strtab + sym->st_name;
  	}
  	else {
  		name = sec_name(sym->st_shndx);
  	}
  	return name;
  }
  
  static Elf_Sym *sym_lookup(const char *symname)
  {
  	int i;
  	for (i = 0; i < ehdr.e_shnum; i++) {
  		struct section *sec = &secs[i];
  		long nsyms;
  		char *strtab;
  		Elf_Sym *symtab;
  		Elf_Sym *sym;
  
  		if (sec->shdr.sh_type != SHT_SYMTAB)
  			continue;
  
  		nsyms = sec->shdr.sh_size/sizeof(Elf_Sym);
  		symtab = sec->symtab;
  		strtab = sec->link->strtab;
  
  		for (sym = symtab; --nsyms >= 0; sym++) {
  			if (!sym->st_name)
  				continue;
  			if (strcmp(symname, strtab + sym->st_name) == 0)
  				return sym;
  		}
  	}
  	return 0;
  }
  
  #if BYTE_ORDER == LITTLE_ENDIAN
  #define le16_to_cpu(val) (val)
  #define le32_to_cpu(val) (val)
  #define le64_to_cpu(val) (val)
  #endif
  #if BYTE_ORDER == BIG_ENDIAN
  #define le16_to_cpu(val) bswap_16(val)
  #define le32_to_cpu(val) bswap_32(val)
  #define le64_to_cpu(val) bswap_64(val)
  #endif
  
  static uint16_t elf16_to_cpu(uint16_t val)
  {
  	return le16_to_cpu(val);
  }
  
  static uint32_t elf32_to_cpu(uint32_t val)
  {
  	return le32_to_cpu(val);
  }
  
  #define elf_half_to_cpu(x)	elf16_to_cpu(x)
  #define elf_word_to_cpu(x)	elf32_to_cpu(x)
  
  #if ELF_BITS == 64
  static uint64_t elf64_to_cpu(uint64_t val)
  {
          return le64_to_cpu(val);
  }
  #define elf_addr_to_cpu(x)	elf64_to_cpu(x)
  #define elf_off_to_cpu(x)	elf64_to_cpu(x)
  #define elf_xword_to_cpu(x)	elf64_to_cpu(x)
  #else
  #define elf_addr_to_cpu(x)	elf32_to_cpu(x)
  #define elf_off_to_cpu(x)	elf32_to_cpu(x)
  #define elf_xword_to_cpu(x)	elf32_to_cpu(x)
  #endif
  
  static void read_ehdr(FILE *fp)
  {
  	if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1) {
  		die("Cannot read ELF header: %s
  ",
  			strerror(errno));
  	}
  	if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0) {
  		die("No ELF magic
  ");
  	}
  	if (ehdr.e_ident[EI_CLASS] != ELF_CLASS) {
  		die("Not a %d bit executable
  ", ELF_BITS);
  	}
  	if (ehdr.e_ident[EI_DATA] != ELFDATA2LSB) {
  		die("Not a LSB ELF executable
  ");
  	}
  	if (ehdr.e_ident[EI_VERSION] != EV_CURRENT) {
  		die("Unknown ELF version
  ");
  	}
  	/* Convert the fields to native endian */
  	ehdr.e_type      = elf_half_to_cpu(ehdr.e_type);
  	ehdr.e_machine   = elf_half_to_cpu(ehdr.e_machine);
  	ehdr.e_version   = elf_word_to_cpu(ehdr.e_version);
  	ehdr.e_entry     = elf_addr_to_cpu(ehdr.e_entry);
  	ehdr.e_phoff     = elf_off_to_cpu(ehdr.e_phoff);
  	ehdr.e_shoff     = elf_off_to_cpu(ehdr.e_shoff);
  	ehdr.e_flags     = elf_word_to_cpu(ehdr.e_flags);
  	ehdr.e_ehsize    = elf_half_to_cpu(ehdr.e_ehsize);
  	ehdr.e_phentsize = elf_half_to_cpu(ehdr.e_phentsize);
  	ehdr.e_phnum     = elf_half_to_cpu(ehdr.e_phnum);
  	ehdr.e_shentsize = elf_half_to_cpu(ehdr.e_shentsize);
  	ehdr.e_shnum     = elf_half_to_cpu(ehdr.e_shnum);
  	ehdr.e_shstrndx  = elf_half_to_cpu(ehdr.e_shstrndx);
  
  	if ((ehdr.e_type != ET_EXEC) && (ehdr.e_type != ET_DYN)) {
  		die("Unsupported ELF header type
  ");
  	}
  	if (ehdr.e_machine != ELF_MACHINE) {
  		die("Not for %s
  ", ELF_MACHINE_NAME);
  	}
  	if (ehdr.e_version != EV_CURRENT) {
  		die("Unknown ELF version
  ");
  	}
  	if (ehdr.e_ehsize != sizeof(Elf_Ehdr)) {
  		die("Bad Elf header size
  ");
  	}
  	if (ehdr.e_phentsize != sizeof(Elf_Phdr)) {
  		die("Bad program header entry
  ");
  	}
  	if (ehdr.e_shentsize != sizeof(Elf_Shdr)) {
  		die("Bad section header entry
  ");
  	}
  	if (ehdr.e_shstrndx >= ehdr.e_shnum) {
  		die("String table index out of bounds
  ");
  	}
  }
  
  static void read_shdrs(FILE *fp)
  {
  	int i;
  	Elf_Shdr shdr;
  
  	secs = calloc(ehdr.e_shnum, sizeof(struct section));
  	if (!secs) {
  		die("Unable to allocate %d section headers
  ",
  		    ehdr.e_shnum);
  	}
  	if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0) {
  		die("Seek to %d failed: %s
  ",
  			ehdr.e_shoff, strerror(errno));
  	}
  	for (i = 0; i < ehdr.e_shnum; i++) {
  		struct section *sec = &secs[i];
  		if (fread(&shdr, sizeof shdr, 1, fp) != 1)
  			die("Cannot read ELF section headers %d/%d: %s
  ",
  			    i, ehdr.e_shnum, strerror(errno));
  		sec->shdr.sh_name      = elf_word_to_cpu(shdr.sh_name);
  		sec->shdr.sh_type      = elf_word_to_cpu(shdr.sh_type);
  		sec->shdr.sh_flags     = elf_xword_to_cpu(shdr.sh_flags);
  		sec->shdr.sh_addr      = elf_addr_to_cpu(shdr.sh_addr);
  		sec->shdr.sh_offset    = elf_off_to_cpu(shdr.sh_offset);
  		sec->shdr.sh_size      = elf_xword_to_cpu(shdr.sh_size);
  		sec->shdr.sh_link      = elf_word_to_cpu(shdr.sh_link);
  		sec->shdr.sh_info      = elf_word_to_cpu(shdr.sh_info);
  		sec->shdr.sh_addralign = elf_xword_to_cpu(shdr.sh_addralign);
  		sec->shdr.sh_entsize   = elf_xword_to_cpu(shdr.sh_entsize);
  		if (sec->shdr.sh_link < ehdr.e_shnum)
  			sec->link = &secs[sec->shdr.sh_link];
  	}
  
  }
  
  static void read_strtabs(FILE *fp)
  {
  	int i;
  	for (i = 0; i < ehdr.e_shnum; i++) {
  		struct section *sec = &secs[i];
  		if (sec->shdr.sh_type != SHT_STRTAB) {
  			continue;
  		}
  		sec->strtab = malloc(sec->shdr.sh_size);
  		if (!sec->strtab) {
  			die("malloc of %d bytes for strtab failed
  ",
  				sec->shdr.sh_size);
  		}
  		if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
  			die("Seek to %d failed: %s
  ",
  				sec->shdr.sh_offset, strerror(errno));
  		}
  		if (fread(sec->strtab, 1, sec->shdr.sh_size, fp)
  		    != sec->shdr.sh_size) {
  			die("Cannot read symbol table: %s
  ",
  				strerror(errno));
  		}
  	}
  }
  
  static void read_symtabs(FILE *fp)
  {
  	int i,j;
  	for (i = 0; i < ehdr.e_shnum; i++) {
  		struct section *sec = &secs[i];
  		if (sec->shdr.sh_type != SHT_SYMTAB) {
  			continue;
  		}
  		sec->symtab = malloc(sec->shdr.sh_size);
  		if (!sec->symtab) {
  			die("malloc of %d bytes for symtab failed
  ",
  				sec->shdr.sh_size);
  		}
  		if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
  			die("Seek to %d failed: %s
  ",
  				sec->shdr.sh_offset, strerror(errno));
  		}
  		if (fread(sec->symtab, 1, sec->shdr.sh_size, fp)
  		    != sec->shdr.sh_size) {
  			die("Cannot read symbol table: %s
  ",
  				strerror(errno));
  		}
  		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)
  {
  	int i,j;
  	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
  ",
  				sec->shdr.sh_size);
  		}
  		if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
  			die("Seek to %d failed: %s
  ",
  				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
  ",
  				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);
  			rel->r_info   = elf_xword_to_cpu(rel->r_info);
  #if (SHT_REL_TYPE == SHT_RELA)
  			rel->r_addend = elf_xword_to_cpu(rel->r_addend);
  #endif
  		}
  	}
  }
  
  
  static void print_absolute_symbols(void)
  {
  	int i;
  	const char *format;
  
  	if (ELF_BITS == 64)
  		format = "%5d %016"PRIx64" %5"PRId64" %10s %10s %12s %s
  ";
  	else
  		format = "%5d %08"PRIx32"  %5"PRId32" %10s %10s %12s %s
  ";
  
  	printf("Absolute symbols
  ");
  	printf(" Num:    Value Size  Type       Bind        Visibility  Name
  ");
  	for (i = 0; i < ehdr.e_shnum; i++) {
  		struct section *sec = &secs[i];
  		char *sym_strtab;
  		int j;
  
  		if (sec->shdr.sh_type != SHT_SYMTAB) {
  			continue;
  		}
  		sym_strtab = sec->link->strtab;
  		for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Sym); j++) {
  			Elf_Sym *sym;
  			const char *name;
  			sym = &sec->symtab[j];
  			name = sym_name(sym_strtab, sym);
  			if (sym->st_shndx != SHN_ABS) {
  				continue;
  			}
  			printf(format,
  				j, sym->st_value, sym->st_size,
  				sym_type(ELF_ST_TYPE(sym->st_info)),
  				sym_bind(ELF_ST_BIND(sym->st_info)),
  				sym_visibility(ELF_ST_VISIBILITY(sym->st_other)),
  				name);
  		}
  	}
  	printf("
  ");
  }
  
  static void print_absolute_relocs(void)
  {
  	int i, printed = 0;
  	const char *format;
  
  	if (ELF_BITS == 64)
  		format = "%016"PRIx64" %016"PRIx64" %10s %016"PRIx64"  %s
  ";
  	else
  		format = "%08"PRIx32" %08"PRIx32" %10s %08"PRIx32"  %s
  ";
  
  	for (i = 0; i < ehdr.e_shnum; i++) {
  		struct section *sec = &secs[i];
  		struct section *sec_applies, *sec_symtab;
  		char *sym_strtab;
  		Elf_Sym *sh_symtab;
  		int j;
  		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;
  			Elf_Sym *sym;
  			const char *name;
  			rel = &sec->reltab[j];
  			sym = &sh_symtab[ELF_R_SYM(rel->r_info)];
  			name = sym_name(sym_strtab, sym);
  			if (sym->st_shndx != SHN_ABS) {
  				continue;
  			}
  
  			/* Absolute symbols are not relocated if bzImage is
  			 * loaded at a non-compiled address. Display a warning
  			 * to user at compile time about the absolute
  			 * relocations present.
  			 *
  			 * User need to audit the code to make sure
  			 * some symbols which should have been section
  			 * relative have not become absolute because of some
  			 * linker optimization or wrong programming usage.
  			 *
  			 * Before warning check if this absolute symbol
  			 * relocation is harmless.
  			 */
  			if (is_reloc(S_ABS, name) || is_reloc(S_REL, name))
  				continue;
  
  			if (!printed) {
  				printf("WARNING: Absolute relocations"
  					" present
  ");
  				printf("Offset     Info     Type     Sym.Value "
  					"Sym.Name
  ");
  				printed = 1;
  			}
  
  			printf(format,
  				rel->r_offset,
  				rel->r_info,
  				rel_type(ELF_R_TYPE(rel->r_info)),
  				sym->st_value,
  				name);
  		}
  	}
  
  	if (printed)
  		printf("
  ");
  }
  
  static void add_reloc(struct relocs *r, uint32_t offset)
  {
  	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 of %ld entries for relocs failed
  ",
                                  newsize);
  		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);
  		}
  	}
  }
  
  /*
   * The .data..percpu section is a special case for x86_64 SMP kernels.
   * It is used to initialize the actual per_cpu areas and to provide
   * definitions for the per_cpu variables that correspond to their offsets
   * within the percpu area. Since the values of all of the symbols need
   * to be offsets from the start of the per_cpu area the virtual address
   * (sh_addr) of .data..percpu is 0 in SMP kernels.
   *
   * This means that:
   *
   *	Relocations that reference symbols in the per_cpu area do not
   *	need further relocation (since the value is an offset relative
   *	to the start of the per_cpu area that does not change).
   *
   *	Relocations that apply to the per_cpu area need to have their
   *	offset adjusted by by the value of __per_cpu_load to make them
   *	point to the correct place in the loaded image (because the
   *	virtual address of .data..percpu is 0).
   *
   * For non SMP kernels .data..percpu is linked as part of the normal
   * kernel data and does not require special treatment.
   *
   */
  static int per_cpu_shndx	= -1;
  Elf_Addr per_cpu_load_addr;
  
  static void percpu_init(void)
  {
  	int i;
  	for (i = 0; i < ehdr.e_shnum; i++) {
  		ElfW(Sym) *sym;
  		if (strcmp(sec_name(i), ".data..percpu"))
  			continue;
  
  		if (secs[i].shdr.sh_addr != 0)	/* non SMP kernel */
  			return;
  
  		sym = sym_lookup("__per_cpu_load");
  		if (!sym)
  			die("can't find __per_cpu_load
  ");
  
  		per_cpu_shndx = i;
  		per_cpu_load_addr = sym->st_value;
  		return;
  	}
  }
  
  #if ELF_BITS == 64
  
  /*
   * Check to see if a symbol lies in the .data..percpu section.
   *
   * The linker incorrectly associates some symbols with the
   * .data..percpu section so we also need to check the symbol
   * name to make sure that we classify the symbol correctly.
   *
   * The GNU linker incorrectly associates:
   *	__init_begin
   *	__per_cpu_load
   *
   * The "gold" linker incorrectly associates:
   *	init_per_cpu__irq_stack_union
   *	init_per_cpu__gdt_page
   */
  static int is_percpu_sym(ElfW(Sym) *sym, const char *symname)
  {
  	return (sym->st_shndx == per_cpu_shndx) &&
  		strcmp(symname, "__init_begin") &&
  		strcmp(symname, "__per_cpu_load") &&
  		strncmp(symname, "init_per_cpu_", 13);
  }
  
  
  static int do_reloc64(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym,
  		      const char *symname)
  {
  	unsigned r_type = ELF64_R_TYPE(rel->r_info);
  	ElfW(Addr) offset = rel->r_offset;
  	int shn_abs = (sym->st_shndx == SHN_ABS) && !is_reloc(S_REL, symname);
  
  	if (sym->st_shndx == SHN_UNDEF)
  		return 0;
  
  	/*
  	 * Adjust the offset if this reloc applies to the percpu section.
  	 */
  	if (sec->shdr.sh_info == per_cpu_shndx)
  		offset += per_cpu_load_addr;
  
  	switch (r_type) {
  	case R_X86_64_NONE:
  	case R_X86_64_PC32:
  		/*
  		 * NONE can be ignored and PC relative relocations don't
  		 * need to be adjusted.
  		 */
  		break;
  
  	case R_X86_64_32:
  	case R_X86_64_32S:
  	case R_X86_64_64:
  		/*
  		 * References to the percpu area don't need to be adjusted.
  		 */
  		if (is_percpu_sym(sym, symname))
  			break;
  
  		if (shn_abs) {
  			/*
  			 * Whitelisted absolute symbols do not require
  			 * relocation.
  			 */
  			if (is_reloc(S_ABS, symname))
  				break;
  
  			die("Invalid absolute %s relocation: %s
  ",
  			    rel_type(r_type), symname);
  			break;
  		}
  
  		/*
  		 * Relocation offsets for 64 bit kernels are output
  		 * as 32 bits and sign extended back to 64 bits when
  		 * the relocations are processed.
  		 * Make sure that the offset will fit.
  		 */
  		if ((int32_t)offset != (int64_t)offset)
  			die("Relocation offset doesn't fit in 32 bits
  ");
  
  		if (r_type == R_X86_64_64)
  			add_reloc(&relocs64, offset);
  		else
  			add_reloc(&relocs32, offset);
  		break;
  
  	default:
  		die("Unsupported relocation type: %s (%d)
  ",
  		    rel_type(r_type), r_type);
  		break;
  	}
  
  	return 0;
  }
  
  #else
  
  static int do_reloc32(struct section *sec, Elf_Rel *rel, Elf_Sym *sym,
  		      const char *symname)
  {
  	unsigned r_type = ELF32_R_TYPE(rel->r_info);
  	int shn_abs = (sym->st_shndx == SHN_ABS) && !is_reloc(S_REL, symname);
  
  	switch (r_type) {
  	case R_386_NONE:
  	case R_386_PC32:
  	case R_386_PC16:
  	case R_386_PC8:
  		/*
  		 * NONE can be ignored and PC relative relocations don't
  		 * need to be adjusted.
  		 */
  		break;
  
  	case R_386_32:
  		if (shn_abs) {
  			/*
  			 * Whitelisted absolute symbols do not require
  			 * relocation.
  			 */
  			if (is_reloc(S_ABS, symname))
  				break;
  
  			die("Invalid absolute %s relocation: %s
  ",
  			    rel_type(r_type), symname);
  			break;
  		}
  
  		add_reloc(&relocs32, rel->r_offset);
  		break;
  
  	default:
  		die("Unsupported relocation type: %s (%d)
  ",
  		    rel_type(r_type), r_type);
  		break;
  	}
  
  	return 0;
  }
  
  static int do_reloc_real(struct section *sec, Elf_Rel *rel, Elf_Sym *sym,
  			 const char *symname)
  {
  	unsigned r_type = ELF32_R_TYPE(rel->r_info);
  	int shn_abs = (sym->st_shndx == SHN_ABS) && !is_reloc(S_REL, symname);
  
  	switch (r_type) {
  	case R_386_NONE:
  	case R_386_PC32:
  	case R_386_PC16:
  	case R_386_PC8:
  		/*
  		 * NONE can be ignored and PC relative relocations don't
  		 * need to be adjusted.
  		 */
  		break;
  
  	case R_386_16:
  		if (shn_abs) {
  			/*
  			 * Whitelisted absolute symbols do not require
  			 * relocation.
  			 */
  			if (is_reloc(S_ABS, symname))
  				break;
  
  			if (is_reloc(S_SEG, symname)) {
  				add_reloc(&relocs16, rel->r_offset);
  				break;
  			}
  		} else {
  			if (!is_reloc(S_LIN, symname))
  				break;
  		}
  		die("Invalid %s %s relocation: %s
  ",
  		    shn_abs ? "absolute" : "relative",
  		    rel_type(r_type), symname);
  		break;
  
  	case R_386_32:
  		if (shn_abs) {
  			/*
  			 * Whitelisted absolute symbols do not require
  			 * relocation.
  			 */
  			if (is_reloc(S_ABS, symname))
  				break;
  
  			if (is_reloc(S_REL, symname)) {
  				add_reloc(&relocs32, rel->r_offset);
  				break;
  			}
  		} else {
  			if (is_reloc(S_LIN, symname))
  				add_reloc(&relocs32, rel->r_offset);
  			break;
  		}
  		die("Invalid %s %s relocation: %s
  ",
  		    shn_abs ? "absolute" : "relative",
  		    rel_type(r_type), symname);
  		break;
  
  	default:
  		die("Unsupported relocation type: %s (%d)
  ",
  		    rel_type(r_type), r_type);
  		break;
  	}
  
  	return 0;
  }
  
  #endif
  
  static int cmp_relocs(const void *va, const void *vb)
  {
  	const uint32_t *a, *b;
  	a = va; b = vb;
  	return (*a == *b)? 0 : (*a > *b)? 1 : -1;
  }
  
  static void sort_relocs(struct relocs *r)
  {
  	qsort(r->offset, r->count, sizeof(r->offset[0]), cmp_relocs);
  }
  
  static int write32(uint32_t v, FILE *f)
  {
  	unsigned char buf[4];
  
  	put_unaligned_le32(v, buf);
  	return fwrite(buf, 1, 4, f) == 4 ? 0 : -1;
  }
  
  static int write32_as_text(uint32_t v, FILE *f)
  {
  	return fprintf(f, "\t.long 0x%08"PRIx32"
  ", v) > 0 ? 0 : -1;
  }
  
  static void emit_relocs(int as_text, int use_real_mode)
  {
  	int i;
  	int (*write_reloc)(uint32_t, FILE *) = write32;
  	int (*do_reloc)(struct section *sec, Elf_Rel *rel, Elf_Sym *sym,
  			const char *symname);
  
  #if ELF_BITS == 64
  	if (!use_real_mode)
  		do_reloc = do_reloc64;
  	else
  		die("--realmode not valid for a 64-bit ELF file");
  #else
  	if (!use_real_mode)
  		do_reloc = do_reloc32;
  	else
  		do_reloc = do_reloc_real;
  #endif
  
  	/* Collect up the relocations */
  	walk_relocs(do_reloc);
  
  	if (relocs16.count && !use_real_mode)
  		die("Segment relocations found but --realmode not specified
  ");
  
  	/* Order the relocations for more efficient processing */
  	sort_relocs(&relocs16);
  	sort_relocs(&relocs32);
  	sort_relocs(&relocs64);
  
  	/* Print the relocations */
  	if (as_text) {
  		/* Print the relocations in a form suitable that
  		 * gas will like.
  		 */
  		printf(".section \".data.reloc\",\"a\"
  ");
  		printf(".balign 4
  ");
  		write_reloc = write32_as_text;
  	}
  
  	if (use_real_mode) {
  		write_reloc(relocs16.count, stdout);
  		for (i = 0; i < relocs16.count; i++)
  			write_reloc(relocs16.offset[i], stdout);
  
  		write_reloc(relocs32.count, stdout);
  		for (i = 0; i < relocs32.count; i++)
  			write_reloc(relocs32.offset[i], stdout);
  	} else {
  		if (ELF_BITS == 64) {
  			/* Print a stop */
  			write_reloc(0, stdout);
  
  			/* Now print each relocation */
  			for (i = 0; i < relocs64.count; i++)
  				write_reloc(relocs64.offset[i], stdout);
  		}
  
  		/* Print a stop */
  		write_reloc(0, stdout);
  
  		/* Now print each relocation */
  		for (i = 0; i < relocs32.count; i++)
  			write_reloc(relocs32.offset[i], stdout);
  	}
  }
  
  /*
   * 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("%s\t%s\t%s\t%s
  ",
  		sec_name(sec->shdr.sh_info),
  		rel_type(ELF_R_TYPE(rel->r_info)),
  		symname,
  		sec_name(sym->st_shndx));
  	return 0;
  }
  
  static void print_reloc_info(void)
  {
  	printf("reloc section\treloc type\tsymbol\tsymbol 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 use_real_mode, int as_text,
  	     int show_absolute_syms, int show_absolute_relocs,
  	     int show_reloc_info)
  {
  	regex_init(use_real_mode);
  	read_ehdr(fp);
  	read_shdrs(fp);
  	read_strtabs(fp);
  	read_symtabs(fp);
  	read_relocs(fp);
  	if (ELF_BITS == 64)
  		percpu_init();
  	if (show_absolute_syms) {
  		print_absolute_symbols();
  		return;
  	}
  	if (show_absolute_relocs) {
  		print_absolute_relocs();
  		return;
  	}
  	if (show_reloc_info) {
  		print_reloc_info();
  		return;
  	}
  	emit_relocs(as_text, use_real_mode);
  }