[e16e8f2] | 1 | /* |
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| 2 | * common.h - Common internal operations performed by the module subsystem |
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| 3 | * |
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| 4 | * Created on: Aug 11, 2008 |
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| 5 | * Author: Stefan Bucur <stefanb@zytor.com> |
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| 6 | */ |
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| 7 | |
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| 8 | #ifndef COMMON_H_ |
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| 9 | #define COMMON_H_ |
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| 10 | |
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| 11 | #include <stdio.h> |
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| 12 | |
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| 13 | #include <sys/module.h> |
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| 14 | #include <linux/list.h> |
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| 15 | |
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| 16 | #include "elfutils.h" |
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| 17 | |
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| 18 | // Performs an operation and jumps to a given label if an error occurs |
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| 19 | #define CHECKED(res, expr, error) \ |
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| 20 | do { \ |
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| 21 | (res) = (expr); \ |
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| 22 | if ((res) < 0) \ |
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| 23 | goto error; \ |
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| 24 | } while (0) |
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| 25 | |
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| 26 | #define MIN(x,y) (((x) < (y)) ? (x) : (y)) |
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| 27 | #define MAX(x,y) (((x) > (y)) ? (x) : (y)) |
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| 28 | |
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| 29 | static inline Elf_Sym *symbol_get_entry(struct elf_module *module, int entry) |
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| 30 | { |
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| 31 | char *sym_table = (char *)module->sym_table; |
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| 32 | int index = entry * module->syment_size; |
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| 33 | |
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| 34 | return (Elf_Sym *)(sym_table + index); |
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| 35 | } |
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| 36 | |
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| 37 | //#define ELF_DEBUG |
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| 38 | |
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| 39 | #ifdef ELF_DEBUG |
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| 40 | #define DBG_PRINT(fmt, args...) fprintf(stderr, "[ELF] " fmt, ##args) |
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| 41 | #else |
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| 42 | #define DBG_PRINT(fmt, args...) // Expand to nothing |
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| 43 | #endif |
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| 44 | |
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| 45 | // User-space debugging routines |
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| 46 | #ifdef ELF_DEBUG |
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| 47 | extern void print_elf_ehdr(Elf_Ehdr *ehdr); |
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| 48 | extern void print_elf_symbols(struct elf_module *module); |
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| 49 | #endif //ELF_DEBUG |
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| 50 | |
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| 51 | |
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| 52 | /* |
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| 53 | * Image files manipulation routines |
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| 54 | */ |
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| 55 | |
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| 56 | extern int image_load(struct elf_module *module); |
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| 57 | extern int image_unload(struct elf_module *module); |
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| 58 | extern int image_read(void *buff, size_t size, struct elf_module *module); |
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| 59 | extern int image_skip(size_t size, struct elf_module *module); |
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| 60 | extern int image_seek(Elf_Off offset, struct elf_module *module); |
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| 61 | |
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| 62 | extern struct module_dep *module_dep_alloc(struct elf_module *module); |
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| 63 | |
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| 64 | extern int check_header_common(Elf_Ehdr *elf_hdr); |
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| 65 | |
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| 66 | extern int enforce_dependency(struct elf_module *req, struct elf_module *dep); |
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| 67 | extern int clear_dependency(struct elf_module *req, struct elf_module *dep); |
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| 68 | |
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| 69 | extern int check_symbols(struct elf_module *module); |
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| 70 | |
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| 71 | |
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| 72 | #endif /* COMMON_H_ */ |
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