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/stddef.h>
10
11 #define KSYM_NAME_LEN 128
12 #define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s]") + (KSYM_NAME_LEN - 1) + \
13 2*(BITS_PER_LONG*3/10) + (MODULE_NAME_LEN - 1) + 1)
14
15 #ifdef CONFIG_KALLSYMS
16 /* Lookup the address for a symbol. Returns 0 if not found. */
17 unsigned long kallsyms_lookup_name(const char *name);
18
19 extern int kallsyms_lookup_size_offset(unsigned long addr,
20 unsigned long *symbolsize,
21 unsigned long *offset);
22
23 /* Lookup an address. modname is set to NULL if it's in the kernel. */
24 const char *kallsyms_lookup(unsigned long addr,
25 unsigned long *symbolsize,
26 unsigned long *offset,
27 char **modname, char *namebuf);
28
29 /* Look up a kernel symbol and return it in a text buffer. */
30 extern int sprint_symbol(char *buffer, unsigned long address);
31
32 /* Look up a kernel symbol and print it to the kernel messages. */
33 extern void __print_symbol(const char *fmt, unsigned long address);
34
35 int lookup_symbol_name(unsigned long addr, char *symname);
36 int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
37
38 #else /* !CONFIG_KALLSYMS */
39
40 static inline unsigned long kallsyms_lookup_name(const char *name)
41 {
42 return 0;
43 }
44
45 static inline int kallsyms_lookup_size_offset(unsigned long addr,
46 unsigned long *symbolsize,
47 unsigned long *offset)
48 {
49 return 0;
50 }
51
52 static inline const char *kallsyms_lookup(unsigned long addr,
53 unsigned long *symbolsize,
54 unsigned long *offset,
55 char **modname, char *namebuf)
56 {
57 return NULL;
58 }
59
60 static inline int sprint_symbol(char *buffer, unsigned long addr)
61 {
62 *buffer = '\0';
63 return 0;
64 }
65
66 static inline int lookup_symbol_name(unsigned long addr, char *symname)
67 {
68 return -ERANGE;
69 }
70
71 static inline int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name)
72 {
73 return -ERANGE;
74 }
75
76 /* Stupid that this does nothing, but I didn't create this mess. */
77 #define __print_symbol(fmt, addr)
78 #endif /*CONFIG_KALLSYMS*/
79
80 /* This macro allows us to keep printk typechecking */
81 static void __check_printsym_format(const char *fmt, ...)
82 __attribute__((format(printf,1,2)));
83 static inline void __check_printsym_format(const char *fmt, ...)
84 {
85 }
86 /* ia64 and ppc64 use function descriptors, which contain the real address */
87 #if defined(CONFIG_IA64) || defined(CONFIG_PPC64)
88 #define print_fn_descriptor_symbol(fmt, addr) \
89 do { \
90 unsigned long *__faddr = (unsigned long*) addr; \
91 print_symbol(fmt, __faddr[0]); \
92 } while (0)
93 #else
94 #define print_fn_descriptor_symbol(fmt, addr) print_symbol(fmt, addr)
95 #endif
96
97 static inline void print_symbol(const char *fmt, unsigned long addr)
98 {
99 __check_printsym_format(fmt, "");
100 __print_symbol(fmt, (unsigned long)
101 __builtin_extract_return_addr((void *)addr));
102 }
103
104 #ifndef CONFIG_64BIT
105 #define print_ip_sym(ip) \
106 do { \
107 printk("[<%08lx>]", ip); \
108 print_symbol(" %s\n", ip); \
109 } while(0)
110 #else
111 #define print_ip_sym(ip) \
112 do { \
113 printk("[<%016lx>]", ip); \
114 print_symbol(" %s\n", ip); \
115 } while(0)
116 #endif
117
118 #endif /*_LINUX_KALLSYMS_H*/
119
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