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/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. */
  18unsigned long kallsyms_lookup_name(const char *name);
  19
  20extern 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. */
  25const 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. */
  31extern int sprint_symbol(char *buffer, unsigned long address);
  32
  33/* Look up a kernel symbol and print it to the kernel messages. */
  34extern void __print_symbol(const char *fmt, unsigned long address);
  35
  36int lookup_symbol_name(unsigned long addr, char *symname);
  37int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
  38
  39#else /* !CONFIG_KALLSYMS */
  40
  41static inline unsigned long kallsyms_lookup_name(const char *name)
  42{
  43        return 0;
  44}
  45
  46static inline int kallsyms_lookup_size_offset(unsigned long addr,
  47                                              unsigned long *symbolsize,
  48                                              unsigned long *offset)
  49{
  50        return 0;
  51}
  52
  53static 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
  61static inline int sprint_symbol(char *buffer, unsigned long addr)
  62{
  63        *buffer = '\0';
  64        return 0;
  65}
  66
  67static inline int lookup_symbol_name(unsigned long addr, char *symname)
  68{
  69        return -ERANGE;
  70}
  71
  72static 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 */
  82static void __check_printsym_format(const char *fmt, ...)
  83__attribute__((format(printf,1,2)));
  84static inline void __check_printsym_format(const char *fmt, ...)
  85{
  86}
  87
  88static 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.  This function is deprecated.
  97 * Please use the "%pF" vsprintf format instead.
  98 */
  99static inline void __deprecated print_fn_descriptor_symbol(const char *fmt, void *addr)
 100{
 101#if defined(CONFIG_IA64) || defined(CONFIG_PPC64)
 102        addr = *(void **)addr;
 103#endif
 104        print_symbol(fmt, (unsigned long)addr);
 105}
 106
 107static inline void print_ip_sym(unsigned long ip)
 108{
 109        printk("[<%p>] %pS\n", (void *) ip, (void *) ip);
 110}
 111
 112#endif /*_LINUX_KALLSYMS_H*/
 113