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