Fix race between cat /proc/*/wchan and rmmod et al
[linux-2.6.git] / 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
9 #define KSYM_NAME_LEN 127
10 #define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s]") + KSYM_NAME_LEN +  \
11                          2*(BITS_PER_LONG*3/10) + MODULE_NAME_LEN + 1)
12
13 #ifdef CONFIG_KALLSYMS
14 /* Lookup the address for a symbol. Returns 0 if not found. */
15 unsigned long kallsyms_lookup_name(const char *name);
16
17 extern int kallsyms_lookup_size_offset(unsigned long addr,
18                                   unsigned long *symbolsize,
19                                   unsigned long *offset);
20
21 /* Lookup an address.  modname is set to NULL if it's in the kernel. */
22 const char *kallsyms_lookup(unsigned long addr,
23                             unsigned long *symbolsize,
24                             unsigned long *offset,
25                             char **modname, char *namebuf);
26
27 /* Look up a kernel symbol and return it in a text buffer. */
28 extern int sprint_symbol(char *buffer, unsigned long address);
29
30 /* Look up a kernel symbol and print it to the kernel messages. */
31 extern void __print_symbol(const char *fmt, unsigned long address);
32
33 int lookup_symbol_name(unsigned long addr, char *symname);
34
35 #else /* !CONFIG_KALLSYMS */
36
37 static inline unsigned long kallsyms_lookup_name(const char *name)
38 {
39         return 0;
40 }
41
42 static inline int kallsyms_lookup_size_offset(unsigned long addr,
43                                               unsigned long *symbolsize,
44                                               unsigned long *offset)
45 {
46         return 0;
47 }
48
49 static inline const char *kallsyms_lookup(unsigned long addr,
50                                           unsigned long *symbolsize,
51                                           unsigned long *offset,
52                                           char **modname, char *namebuf)
53 {
54         return NULL;
55 }
56
57 static inline int sprint_symbol(char *buffer, unsigned long addr)
58 {
59         *buffer = '\0';
60         return 0;
61 }
62
63 static inline int lookup_symbol_name(unsigned long addr, char *symname)
64 {
65         return -ERANGE;
66 }
67
68 /* Stupid that this does nothing, but I didn't create this mess. */
69 #define __print_symbol(fmt, addr)
70 #endif /*CONFIG_KALLSYMS*/
71
72 /* This macro allows us to keep printk typechecking */
73 static void __check_printsym_format(const char *fmt, ...)
74 __attribute__((format(printf,1,2)));
75 static inline void __check_printsym_format(const char *fmt, ...)
76 {
77 }
78 /* ia64 and ppc64 use function descriptors, which contain the real address */
79 #if defined(CONFIG_IA64) || defined(CONFIG_PPC64)
80 #define print_fn_descriptor_symbol(fmt, addr)           \
81 do {                                            \
82         unsigned long *__faddr = (unsigned long*) addr;         \
83         print_symbol(fmt, __faddr[0]);          \
84 } while (0)
85 #else
86 #define print_fn_descriptor_symbol(fmt, addr) print_symbol(fmt, addr)
87 #endif
88
89 static inline void print_symbol(const char *fmt, unsigned long addr)
90 {
91         __check_printsym_format(fmt, "");
92         __print_symbol(fmt, (unsigned long)
93                        __builtin_extract_return_addr((void *)addr));
94 }
95
96 #ifndef CONFIG_64BIT
97 #define print_ip_sym(ip)                \
98 do {                                    \
99         printk("[<%08lx>]", ip);        \
100         print_symbol(" %s\n", ip);      \
101 } while(0)
102 #else
103 #define print_ip_sym(ip)                \
104 do {                                    \
105         printk("[<%016lx>]", ip);       \
106         print_symbol(" %s\n", ip);      \
107 } while(0)
108 #endif
109
110 #endif /*_LINUX_KALLSYMS_H*/