com32/lib/sys/module/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         return (Elf32_Ehdr*)elf_image;
  13 }
  14
  15 /**
  16  * elf_get_pht - Returns a pointer to the first entry in the PHT.
  17  * @elf_image: pointer to the ELF file image in memory
  18  */
  19 static inline Elf32_Phdr *elf_get_pht(void *elf_image) {
  20         Elf32_Ehdr *elf_hdr = elf_get_header(elf_image);
  21
  22         return (Elf32_Phdr*)((Elf32_Off)elf_hdr + elf_hdr->e_phoff);
  23 }
  24
  25 //
  26 /**
  27  * elf_get_ph - Returns the element with the given index in the PTH
  28  * @elf_image: pointer to the ELF file image in memory
  29  * @index: the index of the PHT entry to look for
  30  */
  31 static inline Elf32_Phdr *elf_get_ph(void *elf_image, int index) {
  32         Elf32_Phdr *elf_pht = elf_get_pht(elf_image);
  33         Elf32_Ehdr *elf_hdr = elf_get_header(elf_image);
  34
  35         return (Elf32_Phdr*)((Elf32_Off)elf_pht + index * elf_hdr->e_phentsize);
  36 }
  37
  38 /**
  39  * elf_hash - Returns the index in a SysV hash table for the symbol name.
  40  * @name: the name of the symbol to look for
  41  */
  42 extern unsigned long elf_hash(const unsigned char *name);
  43
  44 /**
  45  * elf_gnu_hash - Returns the index in a GNU hash table for the symbol name.
  46  * @name: the name of the symbol to look for
  47  */
  48 extern unsigned long elf_gnu_hash(const unsigned char *name);
  49
  50 /**
  51  * elf_malloc - Allocates memory to be used by ELF module contents.
  52  * @memptr: pointer to a variable to hold the address of the allocated block.
  53  * @alignment: alignment constraints of the block
  54  * @size: the required size of the block
  55  */
  56 extern int elf_malloc(void **memptr, size_t alignment, size_t size);
  57
  58 /**
  59  * elf_free - Releases memory previously allocated by elf_malloc.
  60  * @memptr: the address of the allocated block
  61  */
  62 extern void elf_free(char *memptr);
  63
  64 #endif /*ELF_UTILS_H_*/