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