include/linux/elf.h

   1 #ifndef _LINUX_ELF_H
   2 #define _LINUX_ELF_H
   3
   4 #include <linux/types.h>
   5 #include <linux/elf-em.h>
   6 #include <asm/elf.h>
   7
   8 struct file;
   9
  10 #ifndef elf_read_implies_exec
  11   /* Executables for which elf_read_implies_exec() returns TRUE will
  12      have the READ_IMPLIES_EXEC personality flag set automatically.
  13      Override in asm/elf.h as needed.  */
  14 # define elf_read_implies_exec(ex, have_pt_gnu_stack)   0
  15 #endif
  16
  17 /* 32-bit ELF base types. */
  18 typedef __u32   Elf32_Addr;
  19 typedef __u16   Elf32_Half;
  20 typedef __u32   Elf32_Off;
  21 typedef __s32   Elf32_Sword;
  22 typedef __u32   Elf32_Word;
  23
  24 /* 64-bit ELF base types. */
  25 typedef __u64   Elf64_Addr;
  26 typedef __u16   Elf64_Half;
  27 typedef __s16   Elf64_SHalf;
  28 typedef __u64   Elf64_Off;
  29 typedef __s32   Elf64_Sword;
  30 typedef __u32   Elf64_Word;
  31 typedef __u64   Elf64_Xword;
  32 typedef __s64   Elf64_Sxword;
  33
  34 /* These constants are for the segment types stored in the image headers */
  35 #define PT_NULL    0
  36 #define PT_LOAD    1
  37 #define PT_DYNAMIC 2
  38 #define PT_INTERP  3
  39 #define PT_NOTE    4
  40 #define PT_SHLIB   5
  41 #define PT_PHDR    6
  42 #define PT_TLS     7               /* Thread local storage segment */
  43 #define PT_LOOS    0x60000000      /* OS-specific */
  44 #define PT_HIOS    0x6fffffff      /* OS-specific */
  45 #define PT_LOPROC  0x70000000
  46 #define PT_HIPROC  0x7fffffff
  47 #define PT_GNU_EH_FRAME         0x6474e550
  48
  49 #define PT_GNU_STACK    (PT_LOOS + 0x474e551)
  50
  51 /* These constants define the different elf file types */
  52 #define ET_NONE   0
  53 #define ET_REL    1
  54 #define ET_EXEC   2
  55 #define ET_DYN    3
  56 #define ET_CORE   4
  57 #define ET_LOPROC 0xff00
  58 #define ET_HIPROC 0xffff
  59
  60 /* This is the info that is needed to parse the dynamic section of the file */
  61 #define DT_NULL         0
  62 #define DT_NEEDED       1
  63 #define DT_PLTRELSZ     2
  64 #define DT_PLTGOT       3
  65 #define DT_HASH         4
  66 #define DT_STRTAB       5
  67 #define DT_SYMTAB       6
  68 #define DT_RELA         7
  69 #define DT_RELASZ       8
  70 #define DT_RELAENT      9
  71 #define DT_STRSZ        10
  72 #define DT_SYMENT       11
  73 #define DT_INIT         12
  74 #define DT_FINI         13
  75 #define DT_SONAME       14
  76 #define DT_RPATH        15
  77 #define DT_SYMBOLIC     16
  78 #define DT_REL          17
  79 #define DT_RELSZ        18
  80 #define DT_RELENT       19
  81 #define DT_PLTREL       20
  82 #define DT_DEBUG        21
  83 #define DT_TEXTREL      22
  84 #define DT_JMPREL       23
  85 #define DT_ENCODING     32
  86 #define OLD_DT_LOOS     0x60000000
  87 #define DT_LOOS         0x6000000d
  88 #define DT_HIOS         0x6ffff000
  89 #define DT_VALRNGLO     0x6ffffd00
  90 #define DT_VALRNGHI     0x6ffffdff
  91 #define DT_ADDRRNGLO    0x6ffffe00
  92 #define DT_ADDRRNGHI    0x6ffffeff
  93 #define DT_VERSYM       0x6ffffff0
  94 #define DT_RELACOUNT    0x6ffffff9
  95 #define DT_RELCOUNT     0x6ffffffa
  96 #define DT_FLAGS_1      0x6ffffffb
  97 #define DT_VERDEF       0x6ffffffc
  98 #define DT_VERDEFNUM    0x6ffffffd
  99 #define DT_VERNEED      0x6ffffffe
 100 #define DT_VERNEEDNUM   0x6fffffff
 101 #define OLD_DT_HIOS     0x6fffffff
 102 #define DT_LOPROC       0x70000000
 103 #define DT_HIPROC       0x7fffffff
 104
 105 /* This info is needed when parsing the symbol table */
 106 #define STB_LOCAL  0
 107 #define STB_GLOBAL 1
 108 #define STB_WEAK   2
 109
 110 #define STT_NOTYPE  0
 111 #define STT_OBJECT  1
 112 #define STT_FUNC    2
 113 #define STT_SECTION 3
 114 #define STT_FILE    4
 115 #define STT_COMMON  5
 116 #define STT_TLS     6
 117
 118 #define ELF_ST_BIND(x)          ((x) >> 4)
 119 #define ELF_ST_TYPE(x)          (((unsigned int) x) & 0xf)
 120 #define ELF32_ST_BIND(x)        ELF_ST_BIND(x)
 121 #define ELF32_ST_TYPE(x)        ELF_ST_TYPE(x)
 122 #define ELF64_ST_BIND(x)        ELF_ST_BIND(x)
 123 #define ELF64_ST_TYPE(x)        ELF_ST_TYPE(x)
 124
 125 typedef struct dynamic{
 126   Elf32_Sword d_tag;
 127   union{
 128     Elf32_Sword d_val;
 129     Elf32_Addr  d_ptr;
 130   } d_un;
 131 } Elf32_Dyn;
 132
 133 typedef struct {
 134   Elf64_Sxword d_tag;           /* entry tag value */
 135   union {
 136     Elf64_Xword d_val;
 137     Elf64_Addr d_ptr;
 138   } d_un;
 139 } Elf64_Dyn;
 140
 141 /* The following are used with relocations */
 142 #define ELF32_R_SYM(x) ((x) >> 8)
 143 #define ELF32_R_TYPE(x) ((x) & 0xff)
 144
 145 #define ELF64_R_SYM(i)                  ((i) >> 32)
 146 #define ELF64_R_TYPE(i)                 ((i) & 0xffffffff)
 147
 148 typedef struct elf32_rel {
 149   Elf32_Addr    r_offset;
 150   Elf32_Word    r_info;
 151 } Elf32_Rel;
 152
 153 typedef struct elf64_rel {
 154   Elf64_Addr r_offset;  /* Location at which to apply the action */
 155   Elf64_Xword r_info;   /* index and type of relocation */
 156 } Elf64_Rel;
 157
 158 typedef struct elf32_rela{
 159   Elf32_Addr    r_offset;
 160   Elf32_Word    r_info;
 161   Elf32_Sword   r_addend;
 162 } Elf32_Rela;
 163
 164 typedef struct elf64_rela {
 165   Elf64_Addr r_offset;  /* Location at which to apply the action */
 166   Elf64_Xword r_info;   /* index and type of relocation */
 167   Elf64_Sxword r_addend;        /* Constant addend used to compute value */
 168 } Elf64_Rela;
 169
 170 typedef struct elf32_sym{
 171   Elf32_Word    st_name;
 172   Elf32_Addr    st_value;
 173   Elf32_Word    st_size;
 174   unsigned char st_info;
 175   unsigned char st_other;
 176   Elf32_Half    st_shndx;
 177 } Elf32_Sym;
 178
 179 typedef struct elf64_sym {
 180   Elf64_Word st_name;           /* Symbol name, index in string tbl */
 181   unsigned char st_info;        /* Type and binding attributes */
 182   unsigned char st_other;       /* No defined meaning, 0 */
 183   Elf64_Half st_shndx;          /* Associated section index */
 184   Elf64_Addr st_value;          /* Value of the symbol */
 185   Elf64_Xword st_size;          /* Associated symbol size */
 186 } Elf64_Sym;
 187
 188
 189 #define EI_NIDENT       16
 190
 191 typedef struct elf32_hdr{
 192   unsigned char e_ident[EI_NIDENT];
 193   Elf32_Half    e_type;
 194   Elf32_Half    e_machine;
 195   Elf32_Word    e_version;
 196   Elf32_Addr    e_entry;  /* Entry point */
 197   Elf32_Off     e_phoff;
 198   Elf32_Off     e_shoff;
 199   Elf32_Word    e_flags;
 200   Elf32_Half    e_ehsize;
 201   Elf32_Half    e_phentsize;
 202   Elf32_Half    e_phnum;
 203   Elf32_Half    e_shentsize;
 204   Elf32_Half    e_shnum;
 205   Elf32_Half    e_shstrndx;
 206 } Elf32_Ehdr;
 207
 208 typedef struct elf64_hdr {
 209   unsigned char e_ident[16];            /* ELF "magic number" */
 210   Elf64_Half e_type;
 211   Elf64_Half e_machine;
 212   Elf64_Word e_version;
 213   Elf64_Addr e_entry;           /* Entry point virtual address */
 214   Elf64_Off e_phoff;            /* Program header table file offset */
 215   Elf64_Off e_shoff;            /* Section header table file offset */
 216   Elf64_Word e_flags;
 217   Elf64_Half e_ehsize;
 218   Elf64_Half e_phentsize;
 219   Elf64_Half e_phnum;
 220   Elf64_Half e_shentsize;
 221   Elf64_Half e_shnum;
 222   Elf64_Half e_shstrndx;
 223 } Elf64_Ehdr;
 224
 225 /* These constants define the permissions on sections in the program
 226    header, p_flags. */
 227 #define PF_R            0x4
 228 #define PF_W            0x2
 229 #define PF_X            0x1
 230
 231 typedef struct elf32_phdr{
 232   Elf32_Word    p_type;
 233   Elf32_Off     p_offset;
 234   Elf32_Addr    p_vaddr;
 235   Elf32_Addr    p_paddr;
 236   Elf32_Word    p_filesz;
 237   Elf32_Word    p_memsz;
 238   Elf32_Word    p_flags;
 239   Elf32_Word    p_align;
 240 } Elf32_Phdr;
 241
 242 typedef struct elf64_phdr {
 243   Elf64_Word p_type;
 244   Elf64_Word p_flags;
 245   Elf64_Off p_offset;           /* Segment file offset */
 246   Elf64_Addr p_vaddr;           /* Segment virtual address */
 247   Elf64_Addr p_paddr;           /* Segment physical address */
 248   Elf64_Xword p_filesz;         /* Segment size in file */
 249   Elf64_Xword p_memsz;          /* Segment size in memory */
 250   Elf64_Xword p_align;          /* Segment alignment, file & memory */
 251 } Elf64_Phdr;
 252
 253 /* sh_type */
 254 #define SHT_NULL        0
 255 #define SHT_PROGBITS    1
 256 #define SHT_SYMTAB      2
 257 #define SHT_STRTAB      3
 258 #define SHT_RELA        4
 259 #define SHT_HASH        5
 260 #define SHT_DYNAMIC     6
 261 #define SHT_NOTE        7
 262 #define SHT_NOBITS      8
 263 #define SHT_REL         9
 264 #define SHT_SHLIB       10
 265 #define SHT_DYNSYM      11
 266 #define SHT_NUM         12
 267 #define SHT_LOPROC      0x70000000
 268 #define SHT_HIPROC      0x7fffffff
 269 #define SHT_LOUSER      0x80000000
 270 #define SHT_HIUSER      0xffffffff
 271
 272 /* sh_flags */
 273 #define SHF_WRITE       0x1
 274 #define SHF_ALLOC       0x2
 275 #define SHF_EXECINSTR   0x4
 276 #define SHF_MASKPROC    0xf0000000
 277
 278 /* special section indexes */
 279 #define SHN_UNDEF       0
 280 #define SHN_LORESERVE   0xff00
 281 #define SHN_LOPROC      0xff00
 282 #define SHN_HIPROC      0xff1f
 283 #define SHN_ABS         0xfff1
 284 #define SHN_COMMON      0xfff2
 285 #define SHN_HIRESERVE   0xffff
 286
 287 typedef struct {
 288   Elf32_Word    sh_name;
 289   Elf32_Word    sh_type;
 290   Elf32_Word    sh_flags;
 291   Elf32_Addr    sh_addr;
 292   Elf32_Off     sh_offset;
 293   Elf32_Word    sh_size;
 294   Elf32_Word    sh_link;
 295   Elf32_Word    sh_info;
 296   Elf32_Word    sh_addralign;
 297   Elf32_Word    sh_entsize;
 298 } Elf32_Shdr;
 299
 300 typedef struct elf64_shdr {
 301   Elf64_Word sh_name;           /* Section name, index in string tbl */
 302   Elf64_Word sh_type;           /* Type of section */
 303   Elf64_Xword sh_flags;         /* Miscellaneous section attributes */
 304   Elf64_Addr sh_addr;           /* Section virtual addr at execution */
 305   Elf64_Off sh_offset;          /* Section file offset */
 306   Elf64_Xword sh_size;          /* Size of section in bytes */
 307   Elf64_Word sh_link;           /* Index of another section */
 308   Elf64_Word sh_info;           /* Additional section information */
 309   Elf64_Xword sh_addralign;     /* Section alignment */
 310   Elf64_Xword sh_entsize;       /* Entry size if section holds table */
 311 } Elf64_Shdr;
 312
 313 #define EI_MAG0         0               /* e_ident[] indexes */
 314 #define EI_MAG1         1
 315 #define EI_MAG2         2
 316 #define EI_MAG3         3
 317 #define EI_CLASS        4
 318 #define EI_DATA         5
 319 #define EI_VERSION      6
 320 #define EI_OSABI        7
 321 #define EI_PAD          8
 322
 323 #define ELFMAG0         0x7f            /* EI_MAG */
 324 #define ELFMAG1         'E'
 325 #define ELFMAG2         'L'
 326 #define ELFMAG3         'F'
 327 #define ELFMAG          "\177ELF"
 328 #define SELFMAG         4
 329
 330 #define ELFCLASSNONE    0               /* EI_CLASS */
 331 #define ELFCLASS32      1
 332 #define ELFCLASS64      2
 333 #define ELFCLASSNUM     3
 334
 335 #define ELFDATANONE     0               /* e_ident[EI_DATA] */
 336 #define ELFDATA2LSB     1
 337 #define ELFDATA2MSB     2
 338
 339 #define EV_NONE         0               /* e_version, EI_VERSION */
 340 #define EV_CURRENT      1
 341 #define EV_NUM          2
 342
 343 #define ELFOSABI_NONE   0
 344 #define ELFOSABI_LINUX  3
 345
 346 #ifndef ELF_OSABI
 347 #define ELF_OSABI ELFOSABI_NONE
 348 #endif
 349
 350 /* Notes used in ET_CORE */
 351 #define NT_PRSTATUS     1
 352 #define NT_PRFPREG      2
 353 #define NT_PRPSINFO     3
 354 #define NT_TASKSTRUCT   4
 355 #define NT_AUXV         6
 356 #define NT_PRXFPREG     0x46e62b7f      /* copied from gdb5.1/include/elf/common.h */
 357 #define NT_PPC_VMX      0x100           /* PowerPC Altivec/VMX registers */
 358
 359
 360 /* Note header in a PT_NOTE section */
 361 typedef struct elf32_note {
 362   Elf32_Word    n_namesz;       /* Name size */
 363   Elf32_Word    n_descsz;       /* Content size */
 364   Elf32_Word    n_type;         /* Content type */
 365 } Elf32_Nhdr;
 366
 367 /* Note header in a PT_NOTE section */
 368 typedef struct elf64_note {
 369   Elf64_Word n_namesz;  /* Name size */
 370   Elf64_Word n_descsz;  /* Content size */
 371   Elf64_Word n_type;    /* Content type */
 372 } Elf64_Nhdr;
 373
 374 #if ELF_CLASS == ELFCLASS32
 375
 376 extern Elf32_Dyn _DYNAMIC [];
 377 #define elfhdr          elf32_hdr
 378 #define elf_phdr        elf32_phdr
 379 #define elf_note        elf32_note
 380 #define elf_addr_t      Elf32_Off
 381
 382 #else
 383
 384 extern Elf64_Dyn _DYNAMIC [];
 385 #define elfhdr          elf64_hdr
 386 #define elf_phdr        elf64_phdr
 387 #define elf_note        elf64_note
 388 #define elf_addr_t      Elf64_Off
 389
 390 #endif
 391
 392 /* Optional callbacks to write extra ELF notes. */
 393 #ifndef ARCH_HAVE_EXTRA_ELF_NOTES
 394 static inline int elf_coredump_extra_notes_size(void) { return 0; }
 395 static inline int elf_coredump_extra_notes_write(struct file *file,
 396                         loff_t *foffset) { return 0; }
 397 #else
 398 extern int elf_coredump_extra_notes_size(void);
 399 extern int elf_coredump_extra_notes_write(struct file *file, loff_t *foffset);
 400 #endif
 401
 402 #endif /* _LINUX_ELF_H */