Linux Kernel  3.7.1
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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 <[email protected]> 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*/