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
  19 // Performs an operation and jumps to a given label if an error occurs
  20 #define CHECKED(res, expr, error)               \
  21         do {                                                            \
  22                 (res) = (expr);                                 \
  23                 if ((res) < 0)                                  \
  24                         goto error;                                     \
  25         } while (0)
  26
  27 #define MIN(x,y)        (((x) < (y)) ? (x) : (y))
  28 #define MAX(x,y)        (((x) > (y)) ? (x) : (y))
  29
  30 static inline Elf32_Sym *symbol_get_entry(struct elf_module *module, int entry)
  31 {
  32         char *sym_table = (char *)module->sym_table;
  33         int index = entry * module->syment_size;
  34
  35         return (Elf32_Sym *)(sym_table + index);
  36 }
  37
  38 //#define ELF_DEBUG
  39
  40 #ifdef ELF_DEBUG
  41 #define DBG_PRINT(fmt, args...) fprintf(stderr, "[ELF] " fmt, ##args)
  42 #else
  43 #define DBG_PRINT(fmt, args...) // Expand to nothing
  44 #endif
  45
  46 // User-space debugging routines
  47 #ifdef ELF_DEBUG
  48 extern void print_elf_ehdr(Elf32_Ehdr *ehdr);
  49 extern void print_elf_symbols(struct elf_module *module);
  50 #endif //ELF_DEBUG
  51
  52
  53 /*
  54  * Image files manipulation routines
  55  */
  56
  57 extern int image_load(struct elf_module *module);
  58 extern int image_unload(struct elf_module *module);
  59 extern int image_read(void *buff, size_t size, struct elf_module *module);
  60 extern int image_skip(size_t size, struct elf_module *module);
  61 extern int image_seek(Elf32_Off offset, struct elf_module *module);
  62
  63 extern struct module_dep *module_dep_alloc(struct elf_module *module);
  64
  65 extern int check_header_common(Elf32_Ehdr *elf_hdr);
  66
  67 extern int enforce_dependency(struct elf_module *req, struct elf_module *dep);
  68 extern int clear_dependency(struct elf_module *req, struct elf_module *dep);
  69
  70 extern int check_symbols(struct elf_module *module);
  71
  72
  73 #endif /* COMMON_H_ */