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