utils/sbinfo/elf.h

   1 #include <stdio.h>
   2 #include <stdint.h>
   3 #include <string.h>
   4 #include <stdbool.h>
   5 #include <stdlib.h>
   6 #include <unistd.h>
   7
   8 /**
   9  * Definitions
  10  *   taken from elf.h linux header
  11  *   based on ELF specification
  12  *   based on ARM ELF specification
  13  */
  14 typedef uint16_t Elf32_Half;
  15
  16 typedef uint32_t Elf32_Word;
  17 typedef int32_t  Elf32_Sword;
  18 typedef uint32_t Elf32_Addr;
  19 typedef uint32_t Elf32_Off;
  20 typedef uint16_t Elf32_Section;
  21
  22 #define EI_NIDENT   16
  23
  24 typedef struct
  25 {
  26     unsigned char   e_ident[EI_NIDENT]; /* Magic number and other info */
  27     Elf32_Half      e_type; /* Object file type */
  28     Elf32_Half      e_machine; /* Architecture */
  29     Elf32_Word      e_version; /* Object file version */
  30     Elf32_Addr      e_entry; /* Entry point virtual address */
  31     Elf32_Off       e_phoff; /* Program header table file offset */
  32     Elf32_Off       e_shoff; /* Section header table file offset */
  33     Elf32_Word      e_flags; /* Processor-specific flags */
  34     Elf32_Half      e_ehsize; /* ELF header size in bytes */
  35     Elf32_Half      e_phentsize; /* Program header table entry size */
  36     Elf32_Half      e_phnum; /* Program header table entry count */
  37     Elf32_Half      e_shentsize; /* Section header table entry size */
  38     Elf32_Half      e_shnum; /* Section header table entry count */
  39     Elf32_Half      e_shstrndx; /* Section header string table index */
  40 }Elf32_Ehdr;
  41
  42 #define EI_MAG0     0 /* File identification byte 0 index */
  43 #define ELFMAG0     0x7f /* Magic number byte 0 */
  44
  45 #define EI_MAG1     1 /* File identification byte 1 index */
  46 #define ELFMAG1     'E' /* Magic number byte 1 */
  47
  48 #define EI_MAG2     2 /* File identification byte 2 index */
  49 #define ELFMAG2     'L' /* Magic number byte 2 */
  50
  51 #define EI_MAG3     3 /* File identification byte 3 index */
  52 #define ELFMAG3     'F' /* Magic number byte 3 */
  53
  54 #define EI_CLASS    4 /* File class byte index */
  55 #define ELFCLASS32  1 /* 32-bit objects */
  56
  57 #define EI_DATA     5 /* Data encoding byte index */
  58 #define ELFDATA2LSB 1 /* 2's complement, little endian */
  59
  60 #define EI_VERSION  6 /* File version byte index, Value must be EV_CURRENT */
  61
  62 #define EI_OSABI    7 /* OS ABI identification */
  63 #define ELFOSABI_NONE       0 /* UNIX System V ABI */
  64 #define ELFOSABI_ARM_AEABI  64 /* ARM EABI */
  65 #define ELFOSABI_ARM        97 /* ARM */
  66
  67 #define EI_ABIVERSION   8 /* ABI version */
  68
  69 #define EI_PAD      9 /* Byte index of padding bytes */
  70
  71 #define ET_EXEC     2 /* Executable file */
  72
  73 #define EM_ARM      40 /* ARM */
  74
  75 #define EV_CURRENT  1 /* Current version */
  76
  77 #define EF_ARM_HASENTRY     0x00000002
  78
  79 #define SHN_UNDEF   0 /* Undefined section */
  80
  81 typedef struct
  82 {
  83     Elf32_Word  p_type; /* Segment type */
  84     Elf32_Off   p_offset; /* Segment file offset */
  85     Elf32_Addr  p_vaddr; /* Segment virtual address */
  86     Elf32_Addr  p_paddr; /* Segment physical address */
  87     Elf32_Word  p_filesz; /* Segment size in file */
  88     Elf32_Word  p_memsz; /* Segment size in memory */
  89     Elf32_Word  p_flags; /* Segment flags */
  90     Elf32_Word  p_align; /* Segment alignment */
  91 }Elf32_Phdr;
  92
  93 #define PT_LOAD     1 /* Loadable program segment */
  94
  95 #define PF_X    (1 << 0) /* Segment is executable */
  96 #define PF_W    (1 << 1) /* Segment is writable */
  97 #define PF_R    (1 << 2) /* Segment is readable */
  98
  99 /**
 100  * API
 101  */
 102 enum elf_section_type_t
 103 {
 104     EST_LOAD,
 105     EST_FILL
 106 };
 107
 108 struct elf_section_t
 109 {
 110     uint32_t addr;
 111     uint32_t size;
 112     enum elf_section_type_t type;
 113     /* <union> */
 114     void *section;
 115     uint32_t pattern;
 116     /* </union> */
 117     struct elf_section_t *next;
 118     /* Internal to elf_output */
 119     uint32_t offset;
 120 };
 121
 122 struct elf_params_t
 123 {
 124     bool has_start_addr;
 125     uint32_t start_addr;
 126     struct elf_section_t *first_section;
 127     struct elf_section_t *last_section;
 128 };
 129
 130 typedef void (*elf_write_fn_t)(void *user, uint32_t addr, const void *buf, size_t count);
 131
 132 void elf_init(struct elf_params_t *params);
 133 void elf_add_load_section(struct elf_params_t *params,
 134     uint32_t load_addr, uint32_t size, const void *section);
 135 void elf_add_fill_section(struct elf_params_t *params,
 136     uint32_t fill_addr, uint32_t size, uint32_t pattern);
 137 void elf_output(struct elf_params_t *params, elf_write_fn_t write, void *user);
 138 bool elf_is_empty(struct elf_params_t *params);
 139 void elf_set_start_addr(struct elf_params_t *params, uint32_t addr);
 140 void elf_release(struct elf_params_t *params);