LXR linux/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/stddef.h>
  10
  11#define KSYM_NAME_LEN 128
  12#define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s]") + (KSYM_NAME_LEN - 1) + \
  13                         2*(BITS_PER_LONG*3/10) + (MODULE_NAME_LEN - 1) + 1)
  14
  15#ifdef CONFIG_KALLSYMS
  16/* Lookup the address for a symbol. Returns 0 if not found. */
  17unsigned long kallsyms_lookup_name(const char *name);
  18
  19extern int kallsyms_lookup_size_offset(unsigned long addr,
  20                                  unsigned long *symbolsize,
  21                                  unsigned long *offset);
  22
  23/* Lookup an address.  modname is set to NULL if it's in the kernel. */
  24const char *kallsyms_lookup(unsigned long addr,
  25                            unsigned long *symbolsize,
  26                            unsigned long *offset,
  27                            char **modname, char *namebuf);
  28
  29/* Look up a kernel symbol and return it in a text buffer. */
  30extern int sprint_symbol(char *buffer, unsigned long address);
  31
  32/* Look up a kernel symbol and print it to the kernel messages. */
  33extern void __print_symbol(const char *fmt, unsigned long address);
  34
  35int lookup_symbol_name(unsigned long addr, char *symname);
  36int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
  37
  38#else /* !CONFIG_KALLSYMS */
  39
  40static inline unsigned long kallsyms_lookup_name(const char *name)
  41{
  42        return 0;
  43}
  44
  45static inline int kallsyms_lookup_size_offset(unsigned long addr,
  46                                              unsigned long *symbolsize,
  47                                              unsigned long *offset)
  48{
  49        return 0;
  50}
  51
  52static inline const char *kallsyms_lookup(unsigned long addr,
  53                                          unsigned long *symbolsize,
  54                                          unsigned long *offset,
  55                                          char **modname, char *namebuf)
  56{
  57        return NULL;
  58}
  59
  60static inline int sprint_symbol(char *buffer, unsigned long addr)
  61{
  62        *buffer = '\0';
  63        return 0;
  64}
  65
  66static inline int lookup_symbol_name(unsigned long addr, char *symname)
  67{
  68        return -ERANGE;
  69}
  70
  71static inline int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name)
  72{
  73        return -ERANGE;
  74}
  75
  76/* Stupid that this does nothing, but I didn't create this mess. */
  77#define __print_symbol(fmt, addr)
  78#endif /*CONFIG_KALLSYMS*/
  79
  80/* This macro allows us to keep printk typechecking */
  81static void __check_printsym_format(const char *fmt, ...)
  82__attribute__((format(printf,1,2)));
  83static inline void __check_printsym_format(const char *fmt, ...)
  84{
  85}
  86/* ia64 and ppc64 use function descriptors, which contain the real address */
  87#if defined(CONFIG_IA64) || defined(CONFIG_PPC64)
  88#define print_fn_descriptor_symbol(fmt, addr)           \
  89do {                                            \
  90        unsigned long *__faddr = (unsigned long*) addr;         \
  91        print_symbol(fmt, __faddr[0]);          \
  92} while (0)
  93#else
  94#define print_fn_descriptor_symbol(fmt, addr) print_symbol(fmt, addr)
  95#endif
  96
  97static inline void print_symbol(const char *fmt, unsigned long addr)
  98{
  99        __check_printsym_format(fmt, "");
 100        __print_symbol(fmt, (unsigned long)
 101                       __builtin_extract_return_addr((void *)addr));
 102}
 103
 104#ifndef CONFIG_64BIT
 105#define print_ip_sym(ip)                \
 106do {                                    \
 107        printk("[<%08lx>]", ip);        \
 108        print_symbol(" %s\n", ip);      \
 109} while(0)
 110#else
 111#define print_ip_sym(ip)                \
 112do {                                    \
 113        printk("[<%016lx>]", ip);       \
 114        print_symbol(" %s\n", ip);      \
 115} while(0)
 116#endif
 117
 118#endif /*_LINUX_KALLSYMS_H*/
 119