linux/include/linux/kallsyms.h
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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#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
  16struct module;
  17
  18#ifdef CONFIG_KALLSYMS
  19/* Lookup the address for a symbol. Returns 0 if not found. */
  20unsigned long kallsyms_lookup_name(const char *name);
  21
  22/* Call a function on each kallsyms symbol in the core kernel */
  23int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *,
  24                                      unsigned long),
  25                            void *data);
  26
  27extern 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. */
  32const 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. */
  38extern int sprint_symbol(char *buffer, unsigned long address);
  39extern int sprint_symbol_no_offset(char *buffer, unsigned long address);
  40extern int sprint_backtrace(char *buffer, unsigned long address);
  41
  42/* Look up a kernel symbol and print it to the kernel messages. */
  43extern void __print_symbol(const char *fmt, unsigned long address);
  44
  45int lookup_symbol_name(unsigned long addr, char *symname);
  46int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
  47
  48#else /* !CONFIG_KALLSYMS */
  49
  50static inline unsigned long kallsyms_lookup_name(const char *name)
  51{
  52        return 0;
  53}
  54
  55static 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
  63static inline int kallsyms_lookup_size_offset(unsigned long addr,
  64                                              unsigned long *symbolsize,
  65                                              unsigned long *offset)
  66{
  67        return 0;
  68}
  69
  70static 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
  78static inline int sprint_symbol(char *buffer, unsigned long addr)
  79{
  80        *buffer = '\0';
  81        return 0;
  82}
  83
  84static inline int sprint_symbol_no_offset(char *buffer, unsigned long addr)
  85{
  86        *buffer = '\0';
  87        return 0;
  88}
  89
  90static inline int sprint_backtrace(char *buffer, unsigned long addr)
  91{
  92        *buffer = '\0';
  93        return 0;
  94}
  95
  96static inline int lookup_symbol_name(unsigned long addr, char *symname)
  97{
  98        return -ERANGE;
  99}
 100
 101static 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 */
 111static __printf(1, 2)
 112void __check_printsym_format(const char *fmt, ...)
 113{
 114}
 115
 116static 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
 123static 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*/
 129
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