include/linux/elf.h

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