com32/lib/sys/module/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 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_ */