Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm
[linux-2.6] / 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 #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*/