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 */ elf_get_header(void * elf_image)12static 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 */ elf_get_pht(void * elf_image)20static 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 */ elf_get_ph(void * elf_image,int index)32static 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_*/ 66