include/linux/kallsyms.h

   1 /* Rewritten and vastly simplified by Rusty Russell for in-kernel
   2  * module loader:
   3  *   Copyright 2002 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
   4  */
   5 #ifndef _LINUX_KALLSYMS_H
   6 #define _LINUX_KALLSYMS_H
   7
   8
   9 #define KSYM_NAME_LEN 127
  10
  11 #ifdef CONFIG_KALLSYMS
  12 /* Lookup the address for a symbol. Returns 0 if not found. */
  13 unsigned long kallsyms_lookup_name(const char *name);
  14
  15 /* Lookup an address.  modname is set to NULL if it's in the kernel. */
  16 const char *kallsyms_lookup(unsigned long addr,
  17                             unsigned long *symbolsize,
  18                             unsigned long *offset,
  19                             char **modname, char *namebuf);
  20
  21 /* Replace "%s" in format with address, if found */
  22 extern void __print_symbol(const char *fmt, unsigned long address);
  23
  24 #else /* !CONFIG_KALLSYMS */
  25
  26 static inline unsigned long kallsyms_lookup_name(const char *name)
  27 {
  28         return 0;
  29 }
  30
  31 static inline const char *kallsyms_lookup(unsigned long addr,
  32                                           unsigned long *symbolsize,
  33                                           unsigned long *offset,
  34                                           char **modname, char *namebuf)
  35 {
  36         return NULL;
  37 }
  38
  39 /* Stupid that this does nothing, but I didn't create this mess. */
  40 #define __print_symbol(fmt, addr)
  41 #endif /*CONFIG_KALLSYMS*/
  42
  43 /* This macro allows us to keep printk typechecking */
  44 static void __check_printsym_format(const char *fmt, ...)
  45 __attribute__((format(printf,1,2)));
  46 static inline void __check_printsym_format(const char *fmt, ...)
  47 {
  48 }
  49 /* ia64 and ppc64 use function descriptors, which contain the real address */
  50 #if defined(CONFIG_IA64) || defined(CONFIG_PPC64)
  51 #define print_fn_descriptor_symbol(fmt, addr)           \
  52 do {                                            \
  53         unsigned long *__faddr = (unsigned long*) addr;         \
  54         print_symbol(fmt, __faddr[0]);          \
  55 } while (0)
  56 #else
  57 #define print_fn_descriptor_symbol(fmt, addr) print_symbol(fmt, addr)
  58 #endif
  59
  60 #define print_symbol(fmt, addr)                 \
  61 do {                                            \
  62         __check_printsym_format(fmt, "");       \
  63         __print_symbol(fmt, addr);              \
  64 } while(0)
  65
  66 #endif /*_LINUX_KALLSYMS_H*/