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  1. /*
  2.  * Copyright (C) 2006 Sergey Bondari
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #ifndef __ELF_H__
  30. #define __ELF_H__
  31.  
  32. #include <arch/elf.h>
  33. #include <arch/types.h>
  34. #include <typedefs.h>
  35.  
  36. /**
  37.  * current ELF version
  38.  */
  39. #define EV_CURRENT  1
  40.  
  41. /**
  42.  * ELF types
  43.  */
  44. #define ET_NONE     0   /* No type */
  45. #define ET_REL      1   /* Relocatable file */
  46. #define ET_EXEC     2   /* Executable */
  47. #define ET_DYN      3   /* Shared object */
  48. #define ET_CORE     4   /* Core */
  49. #define ET_LOPROC   0xff00  /* Processor specific */
  50. #define ET_HIPROC   0xffff  /* Processor specific */
  51.  
  52. /**
  53.  * ELF machine types
  54.  */
  55. #define EM_NO       0   /* No machine */
  56. #define EM_SPARC    2   /* SPARC */
  57. #define EM_386      3   /* i386 */
  58. #define EM_MIPS     8   /* MIPS RS3000 */
  59. #define EM_MIPS_RS3_LE  10  /* MIPS RS3000 LE */
  60. #define EM_PPC      20  /* PPC32 */
  61. #define EM_PPC64    21  /* PPC64 */
  62. #define EM_SPARCV9  43  /* SPARC64 */
  63. #define EM_IA_64    50  /* IA-64 */
  64. #define EM_X86_64   62  /* AMD64/EMT64 */
  65.  
  66. /**
  67.  * ELF identification indexes
  68.  */
  69. #define EI_MAG0     0
  70. #define EI_MAG1     1
  71. #define EI_MAG2     2
  72. #define EI_MAG3     3
  73. #define EI_CLASS    4       /* File class */
  74. #define EI_DATA     5       /* Data encoding */
  75. #define EI_VERSION  6       /* File version */
  76. #define EI_OSABI    7
  77. #define EI_ABIVERSION   8
  78. #define EI_PAD      9       /* Start of padding bytes */
  79. #define EI_NIDENT   16      /* ELF identification table size */
  80.  
  81. /**
  82.  * ELF magic number
  83.  */
  84. #define ELFMAG0     0x7f
  85. #define ELFMAG1     'E'
  86. #define ELFMAG2     'L'
  87. #define ELFMAG3     'F'
  88.  
  89. /**
  90.  * ELF file classes
  91.  */
  92. #define ELFCLASSNONE    0
  93. #define ELFCLASS32  1
  94. #define ELFCLASS64  2
  95.  
  96. /**
  97.  * ELF data encoding types
  98.  */
  99. #define ELFDATANONE 0
  100. #define ELFDATA2LSB 1       /* Least significant byte first (little endian) */
  101. #define ELFDATA2MSB 2       /* Most signigicant byte first (big endian) */
  102.  
  103. /**
  104.  * ELF error return codes
  105.  */
  106. #define EE_OK           0   /* No error */
  107. #define EE_INVALID      1   /* Invalid ELF image */
  108. #define EE_MEMORY       2   /* Cannot allocate address space */
  109. #define EE_INCOMPATIBLE     3   /* ELF image is not compatible with current architecture */
  110. #define EE_UNSUPPORTED      4   /* Non-supported ELF (e.g. dynamic ELFs) */
  111. #define EE_IRRECOVERABLE    5
  112.  
  113. /**
  114.  * ELF section types
  115.  */
  116. #define SHT_NULL        0
  117. #define SHT_PROGBITS        1
  118. #define SHT_SYMTAB      2
  119. #define SHT_STRTAB      3
  120. #define SHT_RELA        4
  121. #define SHT_HASH        5
  122. #define SHT_DYNAMIC     6
  123. #define SHT_NOTE        7
  124. #define SHT_NOBITS      8
  125. #define SHT_REL         9
  126. #define SHT_SHLIB       10
  127. #define SHT_DYNSYM      11
  128. #define SHT_LOOS        0x60000000
  129. #define SHT_HIOS        0x6fffffff
  130. #define SHT_LOPROC      0x70000000
  131. #define SHT_HIPROC      0x7fffffff
  132. #define SHT_LOUSER      0x80000000
  133. #define SHT_HIUSER      0xffffffff
  134.  
  135. /**
  136.  * ELF section flags
  137.  */
  138. #define SHF_WRITE       0x1
  139. #define SHF_ALLOC       0x2
  140. #define SHF_EXECINSTR       0x4
  141. #define SHF_MASKPROC        0xf0000000
  142.  
  143. /**
  144.  * Symbol binding
  145.  */
  146. #define STB_LOCAL       0
  147. #define STB_GLOBAL      1
  148. #define STB_WEAK        2
  149. #define STB_LOPROC      13
  150. #define STB_HIPROC      15
  151.  
  152. /**
  153.  * Symbol types
  154.  */
  155. #define STT_NOTYPE      0
  156. #define STT_OBJECT      1
  157. #define STT_FUNC        2
  158. #define STT_SECTION     3
  159. #define STT_FILE        4
  160. #define STT_LOPROC      13
  161. #define STT_HIPROC      15
  162.  
  163. /**
  164.  * Program segment types
  165.  */
  166. #define PT_NULL         0
  167. #define PT_LOAD         1
  168. #define PT_DYNAMIC      2
  169. #define PT_INTERP       3
  170. #define PT_NOTE         4
  171. #define PT_SHLIB        5
  172. #define PT_PHDR         6
  173. #define PT_LOPROC       0x70000000
  174. #define PT_HIPROC       0x7fffffff
  175.  
  176. /**
  177.  * Program segment attributes.
  178.  */
  179. #define PF_X    1
  180. #define PF_W    2
  181. #define PF_R    4
  182.  
  183. /**
  184.  * ELF data types
  185.  *
  186.  * These types are found to be identical in both 32-bit and 64-bit
  187.  * ELF object file specifications. They are the only types used
  188.  * in ELF header.
  189.  */
  190. typedef __u64 elf_xword;
  191. typedef __s64 elf_sxword;
  192. typedef __u32 elf_word;
  193. typedef __s32 elf_sword;
  194. typedef __u16 elf_half;
  195.  
  196. /**
  197.  * 32-bit ELF data types.
  198.  *
  199.  * These types are specific for 32-bit format.
  200.  */
  201. typedef __u32 elf32_addr;
  202. typedef __u32 elf32_off;
  203.  
  204. /**
  205.  * 64-bit ELF data types.
  206.  *
  207.  * These types are specific for 64-bit format.
  208.  */
  209. typedef __u64 elf64_addr;
  210. typedef __u64 elf64_off;
  211.  
  212. /** ELF header */
  213. struct elf32_header {
  214.     __u8 e_ident[EI_NIDENT];
  215.     elf_half e_type;
  216.     elf_half e_machine;
  217.     elf_word e_version;
  218.     elf32_addr e_entry;
  219.     elf32_off e_phoff;
  220.     elf32_off e_shoff;
  221.     elf_word e_flags;
  222.     elf_half e_ehsize;
  223.     elf_half e_phentsize;
  224.     elf_half e_phnum;
  225.     elf_half e_shentsize;
  226.     elf_half e_shnum;
  227.     elf_half e_shstrndx;
  228. };
  229. struct elf64_header {
  230.     __u8 e_ident[EI_NIDENT];
  231.     elf_half e_type;
  232.     elf_half e_machine;
  233.     elf_word e_version;
  234.     elf64_addr e_entry;
  235.     elf64_off e_phoff;
  236.     elf64_off e_shoff;
  237.     elf_word e_flags;
  238.     elf_half e_ehsize;
  239.     elf_half e_phentsize;
  240.     elf_half e_phnum;
  241.     elf_half e_shentsize;
  242.     elf_half e_shnum;
  243.     elf_half e_shstrndx;
  244. };
  245.  
  246. /*
  247.  * ELF segment header.
  248.  * Segments headers are also known as program headers.
  249.  */
  250. struct elf32_segment_header {
  251.     elf_word p_type;
  252.     elf32_off p_offset;
  253.     elf32_addr p_vaddr;
  254.     elf32_addr p_paddr;
  255.     elf_word p_filesz;
  256.     elf_word p_memsz;
  257.     elf_word p_flags;
  258.     elf_word p_align;
  259. };
  260. struct elf64_segment_header {
  261.     elf_word p_type;
  262.     elf_word p_flags;
  263.     elf64_off p_offset;
  264.     elf64_addr p_vaddr;
  265.     elf64_addr p_paddr;
  266.     elf_xword p_filesz;
  267.     elf_xword p_memsz;
  268.     elf_xword p_align;
  269. };
  270.  
  271. /*
  272.  * ELF section header
  273.  */
  274. struct elf32_section_header {
  275.     elf_word sh_name;
  276.     elf_word sh_type;
  277.     elf_word sh_flags;
  278.     elf32_addr sh_addr;
  279.     elf32_off sh_offset;
  280.     elf_word sh_size;
  281.     elf_word sh_link;
  282.     elf_word sh_info;
  283.     elf_word sh_addralign;
  284.     elf_word sh_entsize;
  285. };
  286. struct elf64_section_header {
  287.     elf_word sh_name;
  288.     elf_word sh_type;
  289.     elf_xword sh_flags;
  290.     elf64_addr sh_addr;
  291.     elf64_off sh_offset;
  292.     elf_xword sh_size;
  293.     elf_word sh_link;
  294.     elf_word sh_info;
  295.     elf_xword sh_addralign;
  296.     elf_xword sh_entsize;
  297. };
  298.  
  299. /*
  300.  * ELF symbol table entry
  301.  */
  302. struct elf32_symbol {
  303.     elf_word st_name;
  304.     elf32_addr st_value;
  305.     elf_word st_size;
  306.     __u8 st_info;
  307.     __u8 st_other;
  308.     elf_half st_shndx;
  309. };
  310. struct elf64_symbol {
  311.     elf_word st_name;
  312.     __u8 st_info;
  313.     __u8 st_other;
  314.     elf_half st_shndx;
  315.     elf64_addr st_value;
  316.     elf_xword st_size;
  317. };
  318.  
  319. #ifdef __32_BITS__
  320. typedef struct elf32_header elf_header_t;
  321. typedef struct elf32_segment_header elf_segment_header_t;
  322. typedef struct elf32_section_header elf_section_header_t;
  323. typedef struct elf32_symbol elf_symbol_t;
  324. #endif
  325. #ifdef __64_BITS__
  326. typedef struct elf64_header elf_header_t;
  327. typedef struct elf64_segment_header elf_segment_header_t;
  328. typedef struct elf64_section_header elf_section_header_t;
  329. typedef struct elf64_symbol elf_symbol_t;
  330. #endif
  331.  
  332. extern int elf_load(elf_header_t *header, as_t * as);
  333. extern char *elf_error(int rc);
  334.  
  335. #endif
  336.