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