1 /*
2 * common.h - Common internal operations performed by the module subsystem
3 *
4 * Created on: Aug 11, 2008
5 * Author: Stefan Bucur <stefanb@zytor.com>
6 */
7
8 #ifndef COMMON_H_
9 #define COMMON_H_
10
11 #include <stdio.h>
12
13 #include <sys/module.h>
14 #include <linux/list.h>
15
16 #include "elfutils.h"
17
18 // Performs an operation and jumps to a given label if an error occurs
19 #define CHECKED(res, expr, error) \
20 do { \
21 (res) = (expr); \
22 if ((res) < 0) \
23 goto error; \
24 } while (0)
25
26 #define MIN(x,y) (((x) < (y)) ? (x) : (y))
27 #define MAX(x,y) (((x) > (y)) ? (x) : (y))
28
symbol_get_entry(struct elf_module * module,int entry)29 static inline Elf_Sym *symbol_get_entry(struct elf_module *module, int entry)
30 {
31 char *sym_table = (char *)module->sym_table;
32 int index = entry * module->syment_size;
33
34 return (Elf_Sym *)(sym_table + index);
35 }
36
37 //#define ELF_DEBUG
38
39 #ifdef ELF_DEBUG
40 #define DBG_PRINT(fmt, args...) fprintf(stderr, "[ELF] " fmt, ##args)
41 #else
42 #define DBG_PRINT(fmt, args...) // Expand to nothing
43 #endif
44
45 // User-space debugging routines
46 #ifdef ELF_DEBUG
47 extern void print_elf_ehdr(Elf_Ehdr *ehdr);
48 extern void print_elf_symbols(struct elf_module *module);
49 #endif //ELF_DEBUG
50
51
52 /*
53 * Image files manipulation routines
54 */
55
56 extern int image_load(struct elf_module *module);
57 extern int image_unload(struct elf_module *module);
58 extern int image_read(void *buff, size_t size, struct elf_module *module);
59 extern int image_skip(size_t size, struct elf_module *module);
60 extern int image_seek(Elf_Off offset, struct elf_module *module);
61
62 extern struct module_dep *module_dep_alloc(struct elf_module *module);
63
64 extern int check_header_common(Elf_Ehdr *elf_hdr);
65
66 extern int enforce_dependency(struct elf_module *req, struct elf_module *dep);
67 extern int clear_dependency(struct elf_module *req, struct elf_module *dep);
68
69 extern int check_symbols(struct elf_module *module);
70
71
72 #endif /* COMMON_H_ */
73