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 extern int kallsyms_lookup_size_offset(unsigned long addr,
  16                                   unsigned long *symbolsize,
  17                                   unsigned long *offset);
  18
  19 /* Lookup an address.  modname is set to NULL if it's in the kernel. */
  20 const char *kallsyms_lookup(unsigned long addr,
  21                             unsigned long *symbolsize,
  22                             unsigned long *offset,
  23                             char **modname, char *namebuf);
  24
  25 /* Replace "%s" in format with address, if found */
  26 extern void __print_symbol(const char *fmt, unsigned long address);
  27
  28 #else /* !CONFIG_KALLSYMS */
  29
  30 static inline unsigned long kallsyms_lookup_name(const char *name)
  31 {
  32         return 0;
  33 }
  34
  35 static inline int kallsyms_lookup_size_offset(unsigned long addr,
  36                                               unsigned long *symbolsize,
  37                                               unsigned long *offset)
  38 {
  39         return 0;
  40 }
  41
  42 static inline const char *kallsyms_lookup(unsigned long addr,
  43                                           unsigned long *symbolsize,
  44                                           unsigned long *offset,
  45                                           char **modname, char *namebuf)
  46 {
  47         return NULL;
  48 }
  49
  50 /* Stupid that this does nothing, but I didn't create this mess. */
  51 #define __print_symbol(fmt, addr)
  52 #endif /*CONFIG_KALLSYMS*/
  53
  54 /* This macro allows us to keep printk typechecking */
  55 static void __check_printsym_format(const char *fmt, ...)
  56 __attribute__((format(printf,1,2)));
  57 static inline void __check_printsym_format(const char *fmt, ...)
  58 {
  59 }
  60 /* ia64 and ppc64 use function descriptors, which contain the real address */
  61 #if defined(CONFIG_IA64) || defined(CONFIG_PPC64)
  62 #define print_fn_descriptor_symbol(fmt, addr)           \
  63 do {                                            \
  64         unsigned long *__faddr = (unsigned long*) addr;         \
  65         print_symbol(fmt, __faddr[0]);          \
  66 } while (0)
  67 #else
  68 #define print_fn_descriptor_symbol(fmt, addr) print_symbol(fmt, addr)
  69 #endif
  70
  71 static inline void print_symbol(const char *fmt, unsigned long addr)
  72 {
  73         __check_printsym_format(fmt, "");
  74         __print_symbol(fmt, (unsigned long)
  75                        __builtin_extract_return_addr((void *)addr));
  76 }
  77
  78 #ifndef CONFIG_64BIT
  79 #define print_ip_sym(ip)                \
  80 do {                                    \
  81         printk("[<%08lx>]", ip);        \
  82         print_symbol(" %s\n", ip);      \
  83 } while(0)
  84 #else
  85 #define print_ip_sym(ip)                \
  86 do {                                    \
  87         printk("[<%016lx>]", ip);       \
  88         print_symbol(" %s\n", ip);      \
  89 } while(0)
  90 #endif
  91
  92 #endif /*_LINUX_KALLSYMS_H*/