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/errno.h>
   9 #include <linux/kernel.h>
  10 #include <linux/stddef.h>
  11
  12 #define KSYM_NAME_LEN 128
  13 #define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s]") + (KSYM_NAME_LEN - 1) + \
  14                          2*(BITS_PER_LONG*3/10) + (MODULE_NAME_LEN - 1) + 1)
  15
  16 #ifdef CONFIG_KALLSYMS
  17 /* Lookup the address for a symbol. Returns 0 if not found. */
  18 unsigned long kallsyms_lookup_name(const char *name);
  19
  20 extern int kallsyms_lookup_size_offset(unsigned long addr,
  21                                   unsigned long *symbolsize,
  22                                   unsigned long *offset);
  23
  24 /* Lookup an address.  modname is set to NULL if it's in the kernel. */
  25 const char *kallsyms_lookup(unsigned long addr,
  26                             unsigned long *symbolsize,
  27                             unsigned long *offset,
  28                             char **modname, char *namebuf);
  29
  30 /* Look up a kernel symbol and return it in a text buffer. */
  31 extern int sprint_symbol(char *buffer, unsigned long address);
  32
  33 /* Look up a kernel symbol and print it to the kernel messages. */
  34 extern void __print_symbol(const char *fmt, unsigned long address);
  35
  36 int lookup_symbol_name(unsigned long addr, char *symname);
  37 int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
  38
  39 #else /* !CONFIG_KALLSYMS */
  40
  41 static inline unsigned long kallsyms_lookup_name(const char *name)
  42 {
  43         return 0;
  44 }
  45
  46 static inline int kallsyms_lookup_size_offset(unsigned long addr,
  47                                               unsigned long *symbolsize,
  48                                               unsigned long *offset)
  49 {
  50         return 0;
  51 }
  52
  53 static inline const char *kallsyms_lookup(unsigned long addr,
  54                                           unsigned long *symbolsize,
  55                                           unsigned long *offset,
  56                                           char **modname, char *namebuf)
  57 {
  58         return NULL;
  59 }
  60
  61 static inline int sprint_symbol(char *buffer, unsigned long addr)
  62 {
  63         *buffer = '\0';
  64         return 0;
  65 }
  66
  67 static inline int lookup_symbol_name(unsigned long addr, char *symname)
  68 {
  69         return -ERANGE;
  70 }
  71
  72 static inline int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name)
  73 {
  74         return -ERANGE;
  75 }
  76
  77 /* Stupid that this does nothing, but I didn't create this mess. */
  78 #define __print_symbol(fmt, addr)
  79 #endif /*CONFIG_KALLSYMS*/
  80
  81 /* This macro allows us to keep printk typechecking */
  82 static void __check_printsym_format(const char *fmt, ...)
  83 __attribute__((format(printf,1,2)));
  84 static inline void __check_printsym_format(const char *fmt, ...)
  85 {
  86 }
  87
  88 static inline void print_symbol(const char *fmt, unsigned long addr)
  89 {
  90         __check_printsym_format(fmt, "");
  91         __print_symbol(fmt, (unsigned long)
  92                        __builtin_extract_return_addr((void *)addr));
  93 }
  94
  95 /*
  96  * Pretty-print a function pointer.
  97  *
  98  * ia64 and ppc64 function pointers are really function descriptors,
  99  * which contain a pointer the real address.
 100  */
 101 static inline void print_fn_descriptor_symbol(const char *fmt, void *addr)
 102 {
 103 #if defined(CONFIG_IA64) || defined(CONFIG_PPC64)
 104         addr = *(void **)addr;
 105 #endif
 106         print_symbol(fmt, (unsigned long)addr);
 107 }
 108
 109 static inline void print_ip_sym(unsigned long ip)
 110 {
 111         printk("[<%p>]", (void *) ip);
 112         print_symbol(" %s\n", ip);
 113 }
 114
 115 #endif /*_LINUX_KALLSYMS_H*/