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 #define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s]") + KSYM_NAME_LEN +  \
  11                          2*(BITS_PER_LONG*3/10) + MODULE_NAME_LEN + 1)
  12
  13 #ifdef CONFIG_KALLSYMS
  14 /* Lookup the address for a symbol. Returns 0 if not found. */
  15 unsigned long kallsyms_lookup_name(const char *name);
  16
  17 extern int kallsyms_lookup_size_offset(unsigned long addr,
  18                                   unsigned long *symbolsize,
  19                                   unsigned long *offset);
  20
  21 /* Lookup an address.  modname is set to NULL if it's in the kernel. */
  22 const char *kallsyms_lookup(unsigned long addr,
  23                             unsigned long *symbolsize,
  24                             unsigned long *offset,
  25                             char **modname, char *namebuf);
  26
  27 /* Look up a kernel symbol and return it in a text buffer. */
  28 extern int sprint_symbol(char *buffer, unsigned long address);
  29
  30 /* Look up a kernel symbol and print it to the kernel messages. */
  31 extern void __print_symbol(const char *fmt, unsigned long address);
  32
  33 #else /* !CONFIG_KALLSYMS */
  34
  35 static inline unsigned long kallsyms_lookup_name(const char *name)
  36 {
  37         return 0;
  38 }
  39
  40 static inline int kallsyms_lookup_size_offset(unsigned long addr,
  41                                               unsigned long *symbolsize,
  42                                               unsigned long *offset)
  43 {
  44         return 0;
  45 }
  46
  47 static inline const char *kallsyms_lookup(unsigned long addr,
  48                                           unsigned long *symbolsize,
  49                                           unsigned long *offset,
  50                                           char **modname, char *namebuf)
  51 {
  52         return NULL;
  53 }
  54
  55 static inline int sprint_symbol(char *buffer, unsigned long addr)
  56 {
  57         *buffer = '\0';
  58         return 0;
  59 }
  60
  61 /* Stupid that this does nothing, but I didn't create this mess. */
  62 #define __print_symbol(fmt, addr)
  63 #endif /*CONFIG_KALLSYMS*/
  64
  65 /* This macro allows us to keep printk typechecking */
  66 static void __check_printsym_format(const char *fmt, ...)
  67 __attribute__((format(printf,1,2)));
  68 static inline void __check_printsym_format(const char *fmt, ...)
  69 {
  70 }
  71 /* ia64 and ppc64 use function descriptors, which contain the real address */
  72 #if defined(CONFIG_IA64) || defined(CONFIG_PPC64)
  73 #define print_fn_descriptor_symbol(fmt, addr)           \
  74 do {                                            \
  75         unsigned long *__faddr = (unsigned long*) addr;         \
  76         print_symbol(fmt, __faddr[0]);          \
  77 } while (0)
  78 #else
  79 #define print_fn_descriptor_symbol(fmt, addr) print_symbol(fmt, addr)
  80 #endif
  81
  82 static inline void print_symbol(const char *fmt, unsigned long addr)
  83 {
  84         __check_printsym_format(fmt, "");
  85         __print_symbol(fmt, (unsigned long)
  86                        __builtin_extract_return_addr((void *)addr));
  87 }
  88
  89 #ifndef CONFIG_64BIT
  90 #define print_ip_sym(ip)                \
  91 do {                                    \
  92         printk("[<%08lx>]", ip);        \
  93         print_symbol(" %s\n", ip);      \
  94 } while(0)
  95 #else
  96 #define print_ip_sym(ip)                \
  97 do {                                    \
  98         printk("[<%016lx>]", ip);       \
  99         print_symbol(" %s\n", ip);      \
 100 } while(0)
 101 #endif
 102
 103 #endif /*_LINUX_KALLSYMS_H*/