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_symbol_no_offset(char *buffer, unsigned long address);
  40 extern int sprint_backtrace(char *buffer, unsigned long address);
  41
  42 /* Look up a kernel symbol and print it to the kernel messages. */
  43 extern void __print_symbol(const char *fmt, unsigned long address);
  44
  45 int lookup_symbol_name(unsigned long addr, char *symname);
  46 int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
  47
  48 #else /* !CONFIG_KALLSYMS */
  49
  50 static inline unsigned long kallsyms_lookup_name(const char *name)
  51 {
  52         return 0;
  53 }
  54
  55 static inline int kallsyms_on_each_symbol(int (*fn)(void *, const char *,
  56                                                     struct module *,
  57                                                     unsigned long),
  58                                           void *data)
  59 {
  60         return 0;
  61 }
  62
  63 static inline int kallsyms_lookup_size_offset(unsigned long addr,
  64                                               unsigned long *symbolsize,
  65                                               unsigned long *offset)
  66 {
  67         return 0;
  68 }
  69
  70 static inline const char *kallsyms_lookup(unsigned long addr,
  71                                           unsigned long *symbolsize,
  72                                           unsigned long *offset,
  73                                           char **modname, char *namebuf)
  74 {
  75         return NULL;
  76 }
  77
  78 static inline int sprint_symbol(char *buffer, unsigned long addr)
  79 {
  80         *buffer = '\0';
  81         return 0;
  82 }
  83
  84 static inline int sprint_symbol_no_offset(char *buffer, unsigned long addr)
  85 {
  86         *buffer = '\0';
  87         return 0;
  88 }
  89
  90 static inline int sprint_backtrace(char *buffer, unsigned long addr)
  91 {
  92         *buffer = '\0';
  93         return 0;
  94 }
  95
  96 static inline int lookup_symbol_name(unsigned long addr, char *symname)
  97 {
  98         return -ERANGE;
  99 }
 100
 101 static inline int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name)
 102 {
 103         return -ERANGE;
 104 }
 105
 106 /* Stupid that this does nothing, but I didn't create this mess. */
 107 #define __print_symbol(fmt, addr)
 108 #endif /*CONFIG_KALLSYMS*/
 109
 110 /* This macro allows us to keep printk typechecking */
 111 static __printf(1, 2)
 112 void __check_printsym_format(const char *fmt, ...)
 113 {
 114 }
 115
 116 static inline void print_symbol(const char *fmt, unsigned long addr)
 117 {
 118         __check_printsym_format(fmt, "");
 119         __print_symbol(fmt, (unsigned long)
 120                        __builtin_extract_return_addr((void *)addr));
 121 }
 122
 123 static inline void print_ip_sym(unsigned long ip)
 124 {
 125         printk("[<%p>] %pS\n", (void *) ip, (void *) ip);
 126 }
 127
 128 #endif /*_LINUX_KALLSYMS_H*/