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
29static 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
47extern void print_elf_ehdr(Elf_Ehdr *ehdr);
48extern void print_elf_symbols(struct elf_module *module);
49#endif //ELF_DEBUG
50
51
52/*
53 * Image files manipulation routines
54 */
55
56extern int image_load(struct elf_module *module);
57extern int image_unload(struct elf_module *module);
58extern int image_read(void *buff, size_t size, struct elf_module *module);
59extern int image_skip(size_t size, struct elf_module *module);
60extern int image_seek(Elf_Off offset, struct elf_module *module);
61
62extern struct module_dep *module_dep_alloc(struct elf_module *module);
63
64extern int check_header_common(Elf_Ehdr *elf_hdr);
65
66extern int enforce_dependency(struct elf_module *req, struct elf_module *dep);
67extern int clear_dependency(struct elf_module *req, struct elf_module *dep);
68
69extern int check_symbols(struct elf_module *module);
70
71
72#endif /* COMMON_H_ */
73