core/elflink/elfutils.h

   1 #ifndef ELF_UTILS_H_
   2 #define ELF_UTILS_H_
   3
   4 #include <elf.h>
   5 #include <stdlib.h>
   6
   7 /**
   8  * elf_get_header - Returns a pointer to the ELF header structure.
   9  * @elf_image: pointer to the ELF file image in memory
  10  */
  11 static inline Elf32_Ehdr *elf_get_header(void *elf_image)
  12 {
  13     return (Elf32_Ehdr *) elf_image;
  14 }
  15
  16 /**
  17  * elf_get_pht - Returns a pointer to the first entry in the PHT.
  18  * @elf_image: pointer to the ELF file image in memory
  19  */
  20 static inline Elf32_Phdr *elf_get_pht(void *elf_image)
  21 {
  22     Elf32_Ehdr *elf_hdr = elf_get_header(elf_image);
  23
  24     return (Elf32_Phdr *) ((Elf32_Off) elf_hdr + elf_hdr->e_phoff);
  25 }
  26
  27 //
  28 /**
  29  * elf_get_ph - Returns the element with the given index in the PTH
  30  * @elf_image: pointer to the ELF file image in memory
  31  * @index: the index of the PHT entry to look for
  32  */
  33 static inline Elf32_Phdr *elf_get_ph(void *elf_image, int index)
  34 {
  35     Elf32_Phdr *elf_pht = elf_get_pht(elf_image);
  36     Elf32_Ehdr *elf_hdr = elf_get_header(elf_image);
  37
  38     return (Elf32_Phdr *) ((Elf32_Off) elf_pht + index * elf_hdr->e_phentsize);
  39 }
  40
  41 /**
  42  * elf_hash - Returns the index in a SysV hash table for the symbol name.
  43  * @name: the name of the symbol to look for
  44  */
  45 extern unsigned long elf_hash(const unsigned char *name);
  46
  47 /**
  48  * elf_gnu_hash - Returns the index in a GNU hash table for the symbol name.
  49  * @name: the name of the symbol to look for
  50  */
  51 extern unsigned long elf_gnu_hash(const unsigned char *name);
  52
  53 /**
  54  * elf_malloc - Allocates memory to be used by ELF module contents.
  55  * @memptr: pointer to a variable to hold the address of the allocated block.
  56  * @alignment: alignment constraints of the block
  57  * @size: the required size of the block
  58  */
  59 extern int elf_malloc(void **memptr, size_t alignment, size_t size);
  60
  61 /**
  62  * elf_free - Releases memory previously allocated by elf_malloc.
  63  * @memptr: the address of the allocated block
  64  */
  65 extern void elf_free(void *memptr);
  66
  67 #endif /*ELF_UTILS_H_ */