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 int lookup_symbol_name(unsigned long addr, char *symname);
  34 int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
  35
  36 #else /* !CONFIG_KALLSYMS */
  37
  38 static inline unsigned long kallsyms_lookup_name(const char *name)
  39 {
  40         return 0;
  41 }
  42
  43 static inline int kallsyms_lookup_size_offset(unsigned long addr,
  44                                               unsigned long *symbolsize,
  45                                               unsigned long *offset)
  46 {
  47         return 0;
  48 }
  49
  50 static inline const char *kallsyms_lookup(unsigned long addr,
  51                                           unsigned long *symbolsize,
  52                                           unsigned long *offset,
  53                                           char **modname, char *namebuf)
  54 {
  55         return NULL;
  56 }
  57
  58 static inline int sprint_symbol(char *buffer, unsigned long addr)
  59 {
  60         *buffer = '\0';
  61         return 0;
  62 }
  63
  64 static inline int lookup_symbol_name(unsigned long addr, char *symname)
  65 {
  66         return -ERANGE;
  67 }
  68
  69 static inline int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name)
  70 {
  71         return -ERANGE;
  72 }
  73
  74 /* Stupid that this does nothing, but I didn't create this mess. */
  75 #define __print_symbol(fmt, addr)
  76 #endif /*CONFIG_KALLSYMS*/
  77
  78 /* This macro allows us to keep printk typechecking */
  79 static void __check_printsym_format(const char *fmt, ...)
  80 __attribute__((format(printf,1,2)));
  81 static inline void __check_printsym_format(const char *fmt, ...)
  82 {
  83 }
  84 /* ia64 and ppc64 use function descriptors, which contain the real address */
  85 #if defined(CONFIG_IA64) || defined(CONFIG_PPC64)
  86 #define print_fn_descriptor_symbol(fmt, addr)           \
  87 do {                                            \
  88         unsigned long *__faddr = (unsigned long*) addr;         \
  89         print_symbol(fmt, __faddr[0]);          \
  90 } while (0)
  91 #else
  92 #define print_fn_descriptor_symbol(fmt, addr) print_symbol(fmt, addr)
  93 #endif
  94
  95 static inline void print_symbol(const char *fmt, unsigned long addr)
  96 {
  97         __check_printsym_format(fmt, "");
  98         __print_symbol(fmt, (unsigned long)
  99                        __builtin_extract_return_addr((void *)addr));
 100 }
 101
 102 #ifndef CONFIG_64BIT
 103 #define print_ip_sym(ip)                \
 104 do {                                    \
 105         printk("[<%08lx>]", ip);        \
 106         print_symbol(" %s\n", ip);      \
 107 } while(0)
 108 #else
 109 #define print_ip_sym(ip)                \
 110 do {                                    \
 111         printk("[<%016lx>]", ip);       \
 112         print_symbol(" %s\n", ip);      \
 113 } while(0)
 114 #endif
 115
 116 #endif /*_LINUX_KALLSYMS_H*/