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 #ifdef __KERNEL__
   7 #include <asm/elf.h>
   8 #endif
   9
  10 struct file;
  11
  12 #ifndef elf_read_implies_exec
  13   /* Executables for which elf_read_implies_exec() returns TRUE will
  14      have the READ_IMPLIES_EXEC personality flag set automatically.
  15      Override in asm/elf.h as needed.  */
  16 # define elf_read_implies_exec(ex, have_pt_gnu_stack)   0
  17 #endif
  18
  19 /* 32-bit ELF base types. */
  20 typedef __u32   Elf32_Addr;
  21 typedef __u16   Elf32_Half;
  22 typedef __u32   Elf32_Off;
  23 typedef __s32   Elf32_Sword;
  24 typedef __u32   Elf32_Word;
  25
  26 /* 64-bit ELF base types. */
  27 typedef __u64   Elf64_Addr;
  28 typedef __u16   Elf64_Half;
  29 typedef __s16   Elf64_SHalf;
  30 typedef __u64   Elf64_Off;
  31 typedef __s32   Elf64_Sword;
  32 typedef __u32   Elf64_Word;
  33 typedef __u64   Elf64_Xword;
  34 typedef __s64   Elf64_Sxword;
  35
  36 /* These constants are for the segment types stored in the image headers */
  37 #define PT_NULL    0
  38 #define PT_LOAD    1
  39 #define PT_DYNAMIC 2
  40 #define PT_INTERP  3
  41 #define PT_NOTE    4
  42 #define PT_SHLIB   5
  43 #define PT_PHDR    6
  44 #define PT_TLS     7               /* Thread local storage segment */
  45 #define PT_LOOS    0x60000000      /* OS-specific */
  46 #define PT_HIOS    0x6fffffff      /* OS-specific */
  47 #define PT_LOPROC  0x70000000
  48 #define PT_HIPROC  0x7fffffff
  49 #define PT_GNU_EH_FRAME         0x6474e550
  50
  51 #define PT_GNU_STACK    (PT_LOOS + 0x474e551)
  52
  53 /*
  54  * Extended Numbering
  55  *
  56  * If the real number of program header table entries is larger than
  57  * or equal to PN_XNUM(0xffff), it is set to sh_info field of the
  58  * section header at index 0, and PN_XNUM is set to e_phnum
  59  * field. Otherwise, the section header at index 0 is zero
  60  * initialized, if it exists.
  61  *
  62  * Specifications are available in:
  63  *
  64  * - Sun microsystems: Linker and Libraries.
  65  *   Part No: 817-1984-17, September 2008.
  66  *   URL: http://docs.sun.com/app/docs/doc/817-1984
  67  *
  68  * - System V ABI AMD64 Architecture Processor Supplement
  69  *   Draft Version 0.99.,
  70  *   May 11, 2009.
  71  *   URL: http://www.x86-64.org/
  72  */
  73 #define PN_XNUM 0xffff
  74
  75 /* These constants define the different elf file types */
  76 #define ET_NONE   0
  77 #define ET_REL    1
  78 #define ET_EXEC   2
  79 #define ET_DYN    3
  80 #define ET_CORE   4
  81 #define ET_LOPROC 0xff00
  82 #define ET_HIPROC 0xffff
  83
  84 /* This is the info that is needed to parse the dynamic section of the file */
  85 #define DT_NULL         0
  86 #define DT_NEEDED       1
  87 #define DT_PLTRELSZ     2
  88 #define DT_PLTGOT       3
  89 #define DT_HASH         4
  90 #define DT_STRTAB       5
  91 #define DT_SYMTAB       6
  92 #define DT_RELA         7
  93 #define DT_RELASZ       8
  94 #define DT_RELAENT      9
  95 #define DT_STRSZ        10
  96 #define DT_SYMENT       11
  97 #define DT_INIT         12
  98 #define DT_FINI         13
  99 #define DT_SONAME       14
 100 #define DT_RPATH        15
 101 #define DT_SYMBOLIC     16
 102 #define DT_REL          17
 103 #define DT_RELSZ        18
 104 #define DT_RELENT       19
 105 #define DT_PLTREL       20
 106 #define DT_DEBUG        21
 107 #define DT_TEXTREL      22
 108 #define DT_JMPREL       23
 109 #define DT_ENCODING     32
 110 #define OLD_DT_LOOS     0x60000000
 111 #define DT_LOOS         0x6000000d
 112 #define DT_HIOS         0x6ffff000
 113 #define DT_VALRNGLO     0x6ffffd00
 114 #define DT_VALRNGHI     0x6ffffdff
 115 #define DT_ADDRRNGLO    0x6ffffe00
 116 #define DT_ADDRRNGHI    0x6ffffeff
 117 #define DT_VERSYM       0x6ffffff0
 118 #define DT_RELACOUNT    0x6ffffff9
 119 #define DT_RELCOUNT     0x6ffffffa
 120 #define DT_FLAGS_1      0x6ffffffb
 121 #define DT_VERDEF       0x6ffffffc
 122 #define DT_VERDEFNUM    0x6ffffffd
 123 #define DT_VERNEED      0x6ffffffe
 124 #define DT_VERNEEDNUM   0x6fffffff
 125 #define OLD_DT_HIOS     0x6fffffff
 126 #define DT_LOPROC       0x70000000
 127 #define DT_HIPROC       0x7fffffff
 128
 129 /* This info is needed when parsing the symbol table */
 130 #define STB_LOCAL  0
 131 #define STB_GLOBAL 1
 132 #define STB_WEAK   2
 133
 134 #define STT_NOTYPE  0
 135 #define STT_OBJECT  1
 136 #define STT_FUNC    2
 137 #define STT_SECTION 3
 138 #define STT_FILE    4
 139 #define STT_COMMON  5
 140 #define STT_TLS     6
 141
 142 #define ELF_ST_BIND(x)          ((x) >> 4)
 143 #define ELF_ST_TYPE(x)          (((unsigned int) x) & 0xf)
 144 #define ELF32_ST_BIND(x)        ELF_ST_BIND(x)
 145 #define ELF32_ST_TYPE(x)        ELF_ST_TYPE(x)
 146 #define ELF64_ST_BIND(x)        ELF_ST_BIND(x)
 147 #define ELF64_ST_TYPE(x)        ELF_ST_TYPE(x)
 148
 149 typedef struct dynamic{
 150   Elf32_Sword d_tag;
 151   union{
 152     Elf32_Sword d_val;
 153     Elf32_Addr  d_ptr;
 154   } d_un;
 155 } Elf32_Dyn;
 156
 157 typedef struct {
 158   Elf64_Sxword d_tag;           /* entry tag value */
 159   union {
 160     Elf64_Xword d_val;
 161     Elf64_Addr d_ptr;
 162   } d_un;
 163 } Elf64_Dyn;
 164
 165 /* The following are used with relocations */
 166 #define ELF32_R_SYM(x) ((x) >> 8)
 167 #define ELF32_R_TYPE(x) ((x) & 0xff)
 168
 169 #define ELF64_R_SYM(i)                  ((i) >> 32)
 170 #define ELF64_R_TYPE(i)                 ((i) & 0xffffffff)
 171
 172 typedef struct elf32_rel {
 173   Elf32_Addr    r_offset;
 174   Elf32_Word    r_info;
 175 } Elf32_Rel;
 176
 177 typedef struct elf64_rel {
 178   Elf64_Addr r_offset;  /* Location at which to apply the action */
 179   Elf64_Xword r_info;   /* index and type of relocation */
 180 } Elf64_Rel;
 181
 182 typedef struct elf32_rela{
 183   Elf32_Addr    r_offset;
 184   Elf32_Word    r_info;
 185   Elf32_Sword   r_addend;
 186 } Elf32_Rela;
 187
 188 typedef struct elf64_rela {
 189   Elf64_Addr r_offset;  /* Location at which to apply the action */
 190   Elf64_Xword r_info;   /* index and type of relocation */
 191   Elf64_Sxword r_addend;        /* Constant addend used to compute value */
 192 } Elf64_Rela;
 193
 194 typedef struct elf32_sym{
 195   Elf32_Word    st_name;
 196   Elf32_Addr    st_value;
 197   Elf32_Word    st_size;
 198   unsigned char st_info;
 199   unsigned char st_other;
 200   Elf32_Half    st_shndx;
 201 } Elf32_Sym;
 202
 203 typedef struct elf64_sym {
 204   Elf64_Word st_name;           /* Symbol name, index in string tbl */
 205   unsigned char st_info;        /* Type and binding attributes */
 206   unsigned char st_other;       /* No defined meaning, 0 */
 207   Elf64_Half st_shndx;          /* Associated section index */
 208   Elf64_Addr st_value;          /* Value of the symbol */
 209   Elf64_Xword st_size;          /* Associated symbol size */
 210 } Elf64_Sym;
 211
 212
 213 #define EI_NIDENT       16
 214
 215 typedef struct elf32_hdr{
 216   unsigned char e_ident[EI_NIDENT];
 217   Elf32_Half    e_type;
 218   Elf32_Half    e_machine;
 219   Elf32_Word    e_version;
 220   Elf32_Addr    e_entry;  /* Entry point */
 221   Elf32_Off     e_phoff;
 222   Elf32_Off     e_shoff;
 223   Elf32_Word    e_flags;
 224   Elf32_Half    e_ehsize;
 225   Elf32_Half    e_phentsize;
 226   Elf32_Half    e_phnum;
 227   Elf32_Half    e_shentsize;
 228   Elf32_Half    e_shnum;
 229   Elf32_Half    e_shstrndx;
 230 } Elf32_Ehdr;
 231
 232 typedef struct elf64_hdr {
 233   unsigned char e_ident[EI_NIDENT];     /* ELF "magic number" */
 234   Elf64_Half e_type;
 235   Elf64_Half e_machine;
 236   Elf64_Word e_version;
 237   Elf64_Addr e_entry;           /* Entry point virtual address */
 238   Elf64_Off e_phoff;            /* Program header table file offset */
 239   Elf64_Off e_shoff;            /* Section header table file offset */
 240   Elf64_Word e_flags;
 241   Elf64_Half e_ehsize;
 242   Elf64_Half e_phentsize;
 243   Elf64_Half e_phnum;
 244   Elf64_Half e_shentsize;
 245   Elf64_Half e_shnum;
 246   Elf64_Half e_shstrndx;
 247 } Elf64_Ehdr;
 248
 249 /* These constants define the permissions on sections in the program
 250    header, p_flags. */
 251 #define PF_R            0x4
 252 #define PF_W            0x2
 253 #define PF_X            0x1
 254
 255 typedef struct elf32_phdr{
 256   Elf32_Word    p_type;
 257   Elf32_Off     p_offset;
 258   Elf32_Addr    p_vaddr;
 259   Elf32_Addr    p_paddr;
 260   Elf32_Word    p_filesz;
 261   Elf32_Word    p_memsz;
 262   Elf32_Word    p_flags;
 263   Elf32_Word    p_align;
 264 } Elf32_Phdr;
 265
 266 typedef struct elf64_phdr {
 267   Elf64_Word p_type;
 268   Elf64_Word p_flags;
 269   Elf64_Off p_offset;           /* Segment file offset */
 270   Elf64_Addr p_vaddr;           /* Segment virtual address */
 271   Elf64_Addr p_paddr;           /* Segment physical address */
 272   Elf64_Xword p_filesz;         /* Segment size in file */
 273   Elf64_Xword p_memsz;          /* Segment size in memory */
 274   Elf64_Xword p_align;          /* Segment alignment, file & memory */
 275 } Elf64_Phdr;
 276
 277 /* sh_type */
 278 #define SHT_NULL        0
 279 #define SHT_PROGBITS    1
 280 #define SHT_SYMTAB      2
 281 #define SHT_STRTAB      3
 282 #define SHT_RELA        4
 283 #define SHT_HASH        5
 284 #define SHT_DYNAMIC     6
 285 #define SHT_NOTE        7
 286 #define SHT_NOBITS      8
 287 #define SHT_REL         9
 288 #define SHT_SHLIB       10
 289 #define SHT_DYNSYM      11
 290 #define SHT_NUM         12
 291 #define SHT_LOPROC      0x70000000
 292 #define SHT_HIPROC      0x7fffffff
 293 #define SHT_LOUSER      0x80000000
 294 #define SHT_HIUSER      0xffffffff
 295
 296 /* sh_flags */
 297 #define SHF_WRITE       0x1
 298 #define SHF_ALLOC       0x2
 299 #define SHF_EXECINSTR   0x4
 300 #define SHF_MASKPROC    0xf0000000
 301
 302 /* special section indexes */
 303 #define SHN_UNDEF       0
 304 #define SHN_LORESERVE   0xff00
 305 #define SHN_LOPROC      0xff00
 306 #define SHN_HIPROC      0xff1f
 307 #define SHN_ABS         0xfff1
 308 #define SHN_COMMON      0xfff2
 309 #define SHN_HIRESERVE   0xffff
 310
 311 typedef struct elf32_shdr {
 312   Elf32_Word    sh_name;
 313   Elf32_Word    sh_type;
 314   Elf32_Word    sh_flags;
 315   Elf32_Addr    sh_addr;
 316   Elf32_Off     sh_offset;
 317   Elf32_Word    sh_size;
 318   Elf32_Word    sh_link;
 319   Elf32_Word    sh_info;
 320   Elf32_Word    sh_addralign;
 321   Elf32_Word    sh_entsize;
 322 } Elf32_Shdr;
 323
 324 typedef struct elf64_shdr {
 325   Elf64_Word sh_name;           /* Section name, index in string tbl */
 326   Elf64_Word sh_type;           /* Type of section */
 327   Elf64_Xword sh_flags;         /* Miscellaneous section attributes */
 328   Elf64_Addr sh_addr;           /* Section virtual addr at execution */
 329   Elf64_Off sh_offset;          /* Section file offset */
 330   Elf64_Xword sh_size;          /* Size of section in bytes */
 331   Elf64_Word sh_link;           /* Index of another section */
 332   Elf64_Word sh_info;           /* Additional section information */
 333   Elf64_Xword sh_addralign;     /* Section alignment */
 334   Elf64_Xword sh_entsize;       /* Entry size if section holds table */
 335 } Elf64_Shdr;
 336
 337 #define EI_MAG0         0               /* e_ident[] indexes */
 338 #define EI_MAG1         1
 339 #define EI_MAG2         2
 340 #define EI_MAG3         3
 341 #define EI_CLASS        4
 342 #define EI_DATA         5
 343 #define EI_VERSION      6
 344 #define EI_OSABI        7
 345 #define EI_PAD          8
 346
 347 #define ELFMAG0         0x7f            /* EI_MAG */
 348 #define ELFMAG1         'E'
 349 #define ELFMAG2         'L'
 350 #define ELFMAG3         'F'
 351 #define ELFMAG          "\177ELF"
 352 #define SELFMAG         4
 353
 354 #define ELFCLASSNONE    0               /* EI_CLASS */
 355 #define ELFCLASS32      1
 356 #define ELFCLASS64      2
 357 #define ELFCLASSNUM     3
 358
 359 #define ELFDATANONE     0               /* e_ident[EI_DATA] */
 360 #define ELFDATA2LSB     1
 361 #define ELFDATA2MSB     2
 362
 363 #define EV_NONE         0               /* e_version, EI_VERSION */
 364 #define EV_CURRENT      1
 365 #define EV_NUM          2
 366
 367 #define ELFOSABI_NONE   0
 368 #define ELFOSABI_LINUX  3
 369
 370 #ifndef ELF_OSABI
 371 #define ELF_OSABI ELFOSABI_NONE
 372 #endif
 373
 374 /*
 375  * Notes used in ET_CORE. Architectures export some of the arch register sets
 376  * using the corresponding note types via the PTRACE_GETREGSET and
 377  * PTRACE_SETREGSET requests.
 378  */
 379 #define NT_PRSTATUS     1
 380 #define NT_PRFPREG      2
 381 #define NT_PRPSINFO     3
 382 #define NT_TASKSTRUCT   4
 383 #define NT_AUXV         6
 384 #define NT_PRXFPREG     0x46e62b7f      /* copied from gdb5.1/include/elf/common.h */
 385 #define NT_PPC_VMX      0x100           /* PowerPC Altivec/VMX registers */
 386 #define NT_PPC_SPE      0x101           /* PowerPC SPE/EVR registers */
 387 #define NT_PPC_VSX      0x102           /* PowerPC VSX registers */
 388 #define NT_386_TLS      0x200           /* i386 TLS slots (struct user_desc) */
 389 #define NT_386_IOPERM   0x201           /* x86 io permission bitmap (1=deny) */
 390 #define NT_X86_XSTATE   0x202           /* x86 extended state using xsave */
 391 #define NT_S390_HIGH_GPRS       0x300   /* s390 upper register halves */
 392 #define NT_S390_TIMER   0x301           /* s390 timer register */
 393 #define NT_S390_TODCMP  0x302           /* s390 TOD clock comparator register */
 394 #define NT_S390_TODPREG 0x303           /* s390 TOD programmable register */
 395 #define NT_S390_CTRS    0x304           /* s390 control registers */
 396 #define NT_S390_PREFIX  0x305           /* s390 prefix register */
 397 #define NT_S390_LAST_BREAK      0x306   /* s390 breaking event address */
 398
 399
 400 /* Note header in a PT_NOTE section */
 401 typedef struct elf32_note {
 402   Elf32_Word    n_namesz;       /* Name size */
 403   Elf32_Word    n_descsz;       /* Content size */
 404   Elf32_Word    n_type;         /* Content type */
 405 } Elf32_Nhdr;
 406
 407 /* Note header in a PT_NOTE section */
 408 typedef struct elf64_note {
 409   Elf64_Word n_namesz;  /* Name size */
 410   Elf64_Word n_descsz;  /* Content size */
 411   Elf64_Word n_type;    /* Content type */
 412 } Elf64_Nhdr;
 413
 414 #ifdef __KERNEL__
 415 #if ELF_CLASS == ELFCLASS32
 416
 417 extern Elf32_Dyn _DYNAMIC [];
 418 #define elfhdr          elf32_hdr
 419 #define elf_phdr        elf32_phdr
 420 #define elf_shdr        elf32_shdr
 421 #define elf_note        elf32_note
 422 #define elf_addr_t      Elf32_Off
 423 #define Elf_Half        Elf32_Half
 424
 425 #else
 426
 427 extern Elf64_Dyn _DYNAMIC [];
 428 #define elfhdr          elf64_hdr
 429 #define elf_phdr        elf64_phdr
 430 #define elf_shdr        elf64_shdr
 431 #define elf_note        elf64_note
 432 #define elf_addr_t      Elf64_Off
 433 #define Elf_Half        Elf64_Half
 434
 435 #endif
 436
 437 /* Optional callbacks to write extra ELF notes. */
 438 #ifndef ARCH_HAVE_EXTRA_ELF_NOTES
 439 static inline int elf_coredump_extra_notes_size(void) { return 0; }
 440 static inline int elf_coredump_extra_notes_write(struct file *file,
 441                         loff_t *foffset) { return 0; }
 442 #else
 443 extern int elf_coredump_extra_notes_size(void);
 444 extern int elf_coredump_extra_notes_write(struct file *file, loff_t *foffset);
 445 #endif
 446 #endif /* __KERNEL__ */
 447 #endif /* _LINUX_ELF_H */