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 struct module;
  17
  18 #ifdef CONFIG_KALLSYMS
  19 /* Lookup the address for a symbol. Returns 0 if not found. */
  20 unsigned long kallsyms_lookup_name(const char *name);
  21
  22 /* Call a function on each kallsyms symbol in the core kernel */
  23 int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *,
  24                                       unsigned long),
  25                             void *data);
  26
  27 extern int kallsyms_lookup_size_offset(unsigned long addr,
  28                                   unsigned long *symbolsize,
  29                                   unsigned long *offset);
  30
  31 /* Lookup an address.  modname is set to NULL if it's in the kernel. */
  32 const char *kallsyms_lookup(unsigned long addr,
  33                             unsigned long *symbolsize,
  34                             unsigned long *offset,
  35                             char **modname, char *namebuf);
  36
  37 /* Look up a kernel symbol and return it in a text buffer. */
  38 extern int sprint_symbol(char *buffer, unsigned long address);
  39 extern int sprint_backtrace(char *buffer, unsigned long address);
  40
  41 /* Look up a kernel symbol and print it to the kernel messages. */
  42 extern void __print_symbol(const char *fmt, unsigned long address);
  43
  44 int lookup_symbol_name(unsigned long addr, char *symname);
  45 int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
  46
  47 #else /* !CONFIG_KALLSYMS */
  48
  49 static inline unsigned long kallsyms_lookup_name(const char *name)
  50 {
  51         return 0;
  52 }
  53
  54 static inline int kallsyms_on_each_symbol(int (*fn)(void *, const char *,
  55                                                     struct module *,
  56                                                     unsigned long),
  57                                           void *data)
  58 {
  59         return 0;
  60 }
  61
  62 static inline int kallsyms_lookup_size_offset(unsigned long addr,
  63                                               unsigned long *symbolsize,
  64                                               unsigned long *offset)
  65 {
  66         return 0;
  67 }
  68
  69 static inline const char *kallsyms_lookup(unsigned long addr,
  70                                           unsigned long *symbolsize,
  71                                           unsigned long *offset,
  72                                           char **modname, char *namebuf)
  73 {
  74         return NULL;
  75 }
  76
  77 static inline int sprint_symbol(char *buffer, unsigned long addr)
  78 {
  79         *buffer = '\0';
  80         return 0;
  81 }
  82
  83 static inline int sprint_backtrace(char *buffer, unsigned long addr)
  84 {
  85         *buffer = '\0';
  86         return 0;
  87 }
  88
  89 static inline int lookup_symbol_name(unsigned long addr, char *symname)
  90 {
  91         return -ERANGE;
  92 }
  93
  94 static inline int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name)
  95 {
  96         return -ERANGE;
  97 }
  98
  99 /* Stupid that this does nothing, but I didn't create this mess. */
 100 #define __print_symbol(fmt, addr)
 101 #endif /*CONFIG_KALLSYMS*/
 102
 103 /* This macro allows us to keep printk typechecking */
 104 static __printf(1, 2)
 105 void __check_printsym_format(const char *fmt, ...)
 106 {
 107 }
 108
 109 static inline void print_symbol(const char *fmt, unsigned long addr)
 110 {
 111         __check_printsym_format(fmt, "");
 112         __print_symbol(fmt, (unsigned long)
 113                        __builtin_extract_return_addr((void *)addr));
 114 }
 115
 116 static inline void print_ip_sym(unsigned long ip)
 117 {
 118         printk("[<%p>] %pS\n", (void *) ip, (void *) ip);
 119 }
 120
 121 #endif /*_LINUX_KALLSYMS_H*/