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_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
kallsyms_lookup_name(const char * name)50 static inline unsigned long kallsyms_lookup_name(const char *name)
51 {
52 return 0;
53 }
54
kallsyms_on_each_symbol(int (* fn)(void *,const char *,struct module *,unsigned long),void * data)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
kallsyms_lookup_size_offset(unsigned long addr,unsigned long * symbolsize,unsigned long * offset)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
kallsyms_lookup(unsigned long addr,unsigned long * symbolsize,unsigned long * offset,char ** modname,char * namebuf)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
sprint_symbol(char * buffer,unsigned long addr)78 static inline int sprint_symbol(char *buffer, unsigned long addr)
79 {
80 *buffer = '\0';
81 return 0;
82 }
83
sprint_symbol_no_offset(char * buffer,unsigned long addr)84 static inline int sprint_symbol_no_offset(char *buffer, unsigned long addr)
85 {
86 *buffer = '\0';
87 return 0;
88 }
89
sprint_backtrace(char * buffer,unsigned long addr)90 static inline int sprint_backtrace(char *buffer, unsigned long addr)
91 {
92 *buffer = '\0';
93 return 0;
94 }
95
lookup_symbol_name(unsigned long addr,char * symname)96 static inline int lookup_symbol_name(unsigned long addr, char *symname)
97 {
98 return -ERANGE;
99 }
100
lookup_symbol_attrs(unsigned long addr,unsigned long * size,unsigned long * offset,char * modname,char * name)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)
__check_printsym_format(const char * fmt,...)112 void __check_printsym_format(const char *fmt, ...)
113 {
114 }
115
print_symbol(const char * fmt,unsigned long addr)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
print_ip_sym(unsigned long ip)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*/
129