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