core/elflink/common.h

   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
  29 //#define ELF_DEBUG
  30
  31 #ifdef ELF_DEBUG
  32 #define DBG_PRINT(fmt, args...) fprintf(stderr, "[ELF] " fmt, ##args)
  33 #else
  34 #define DBG_PRINT(fmt, args...) // Expand to nothing
  35 #endif
  36
  37 // User-space debugging routines
  38 #ifdef ELF_DEBUG
  39 extern void print_elf_ehdr(Elf32_Ehdr * ehdr);
  40 extern void print_elf_symbols(struct elf_module *module);
  41 #endif //ELF_DEBUG
  42
  43 /*
  44  * Image files manipulation routines
  45  */
  46
  47 extern int image_load(struct elf_module *module);
  48 extern int image_unload(struct elf_module *module);
  49 extern int image_read(void *buff, size_t size, struct elf_module *module);
  50 extern int image_skip(size_t size, struct elf_module *module);
  51 extern int image_seek(Elf32_Off offset, struct elf_module *module);
  52
  53 extern struct module_dep *module_dep_alloc(struct elf_module *module);
  54
  55 extern int check_header_common(Elf32_Ehdr * elf_hdr);
  56
  57 extern int enforce_dependency(struct elf_module *req, struct elf_module *dep);
  58 extern int clear_dependency(struct elf_module *req, struct elf_module *dep);
  59
  60 extern int check_symbols(struct elf_module *module);
  61
  62 #endif /* COMMON_H_ */