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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