1 /* 2 * common.h - Common internal operations performed by the module subsystem 3 * 4 * Created on: Aug 11, 2008 5 * Author: Stefan Bucur <stefanb (at) 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 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
