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 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_backtrace(char *buffer, unsigned long address);
40
41 /* Look up a kernel symbol and print it to the kernel messages. */
42 extern void __print_symbol(const char *fmt, unsigned long address);
43
44 int lookup_symbol_name(unsigned long addr, char *symname);
45 int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
46
47 #else /* !CONFIG_KALLSYMS */
48
kallsyms_lookup_name(const char * name)49 static inline unsigned long kallsyms_lookup_name(const char *name)
50 {
51 return 0;
52 }
53
kallsyms_on_each_symbol(int (* fn)(void *,const char *,struct module *,unsigned long),void * data)54 static inline int kallsyms_on_each_symbol(int (*fn)(void *, const char *,
55 struct module *,
56 unsigned long),
57 void *data)
58 {
59 return 0;
60 }
61
kallsyms_lookup_size_offset(unsigned long addr,unsigned long * symbolsize,unsigned long * offset)62 static inline int kallsyms_lookup_size_offset(unsigned long addr,
63 unsigned long *symbolsize,
64 unsigned long *offset)
65 {
66 return 0;
67 }
68
kallsyms_lookup(unsigned long addr,unsigned long * symbolsize,unsigned long * offset,char ** modname,char * namebuf)69 static inline const char *kallsyms_lookup(unsigned long addr,
70 unsigned long *symbolsize,
71 unsigned long *offset,
72 char **modname, char *namebuf)
73 {
74 return NULL;
75 }
76
sprint_symbol(char * buffer,unsigned long addr)77 static inline int sprint_symbol(char *buffer, unsigned long addr)
78 {
79 *buffer = '\0';
80 return 0;
81 }
82
sprint_backtrace(char * buffer,unsigned long addr)83 static inline int sprint_backtrace(char *buffer, unsigned long addr)
84 {
85 *buffer = '\0';
86 return 0;
87 }
88
lookup_symbol_name(unsigned long addr,char * symname)89 static inline int lookup_symbol_name(unsigned long addr, char *symname)
90 {
91 return -ERANGE;
92 }
93
lookup_symbol_attrs(unsigned long addr,unsigned long * size,unsigned long * offset,char * modname,char * name)94 static inline int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name)
95 {
96 return -ERANGE;
97 }
98
99 /* Stupid that this does nothing, but I didn't create this mess. */
100 #define __print_symbol(fmt, addr)
101 #endif /*CONFIG_KALLSYMS*/
102
103 /* This macro allows us to keep printk typechecking */
104 static __printf(1, 2)
__check_printsym_format(const char * fmt,...)105 void __check_printsym_format(const char *fmt, ...)
106 {
107 }
108
print_symbol(const char * fmt,unsigned long addr)109 static inline void print_symbol(const char *fmt, unsigned long addr)
110 {
111 __check_printsym_format(fmt, "");
112 __print_symbol(fmt, (unsigned long)
113 __builtin_extract_return_addr((void *)addr));
114 }
115
print_ip_sym(unsigned long ip)116 static inline void print_ip_sym(unsigned long ip)
117 {
118 printk("[<%p>] %pS\n", (void *) ip, (void *) ip);
119 }
120
121 #endif /*_LINUX_KALLSYMS_H*/
122