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Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | /* Rewritten and vastly simplified by Rusty Russell for in-kernel |
3 | * module loader: | |
4 | * Copyright 2002 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation | |
5 | */ | |
6 | #ifndef _LINUX_KALLSYMS_H | |
7 | #define _LINUX_KALLSYMS_H | |
8 | ||
40e48eed | 9 | #include <linux/errno.h> |
2711b793 | 10 | #include <linux/kernel.h> |
5a75983e | 11 | #include <linux/stddef.h> |
04b8eb7a SS |
12 | #include <linux/mm.h> |
13 | #include <linux/module.h> | |
14 | ||
15 | #include <asm/sections.h> | |
1da177e4 | 16 | |
9281acea TH |
17 | #define KSYM_NAME_LEN 128 |
18 | #define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s]") + (KSYM_NAME_LEN - 1) + \ | |
19 | 2*(BITS_PER_LONG*3/10) + (MODULE_NAME_LEN - 1) + 1) | |
1da177e4 | 20 | |
75a66614 AK |
21 | struct module; |
22 | ||
04b8eb7a SS |
23 | static inline int is_kernel_inittext(unsigned long addr) |
24 | { | |
25 | if (addr >= (unsigned long)_sinittext | |
26 | && addr <= (unsigned long)_einittext) | |
27 | return 1; | |
28 | return 0; | |
29 | } | |
30 | ||
31 | static inline int is_kernel_text(unsigned long addr) | |
32 | { | |
33 | if ((addr >= (unsigned long)_stext && addr <= (unsigned long)_etext) || | |
34 | arch_is_kernel_text(addr)) | |
35 | return 1; | |
36 | return in_gate_area_no_mm(addr); | |
37 | } | |
38 | ||
39 | static inline int is_kernel(unsigned long addr) | |
40 | { | |
41 | if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end) | |
42 | return 1; | |
43 | return in_gate_area_no_mm(addr); | |
44 | } | |
45 | ||
46 | static inline int is_ksym_addr(unsigned long addr) | |
47 | { | |
48 | if (IS_ENABLED(CONFIG_KALLSYMS_ALL)) | |
49 | return is_kernel(addr); | |
50 | ||
51 | return is_kernel_text(addr) || is_kernel_inittext(addr); | |
52 | } | |
53 | ||
54 | static inline void *dereference_symbol_descriptor(void *ptr) | |
55 | { | |
56 | #ifdef HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR | |
57 | struct module *mod; | |
58 | ||
59 | ptr = dereference_kernel_function_descriptor(ptr); | |
60 | if (is_ksym_addr((unsigned long)ptr)) | |
61 | return ptr; | |
62 | ||
63 | preempt_disable(); | |
64 | mod = __module_address((unsigned long)ptr); | |
65 | preempt_enable(); | |
66 | ||
67 | if (mod) | |
68 | ptr = dereference_module_function_descriptor(mod, ptr); | |
69 | #endif | |
70 | return ptr; | |
71 | } | |
72 | ||
1da177e4 LT |
73 | #ifdef CONFIG_KALLSYMS |
74 | /* Lookup the address for a symbol. Returns 0 if not found. */ | |
75 | unsigned long kallsyms_lookup_name(const char *name); | |
76 | ||
75a66614 AK |
77 | /* Call a function on each kallsyms symbol in the core kernel */ |
78 | int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *, | |
79 | unsigned long), | |
80 | void *data); | |
81 | ||
ffc50891 FBH |
82 | extern int kallsyms_lookup_size_offset(unsigned long addr, |
83 | unsigned long *symbolsize, | |
84 | unsigned long *offset); | |
85 | ||
1da177e4 LT |
86 | /* Lookup an address. modname is set to NULL if it's in the kernel. */ |
87 | const char *kallsyms_lookup(unsigned long addr, | |
88 | unsigned long *symbolsize, | |
89 | unsigned long *offset, | |
90 | char **modname, char *namebuf); | |
91 | ||
42e38083 RP |
92 | /* Look up a kernel symbol and return it in a text buffer. */ |
93 | extern int sprint_symbol(char *buffer, unsigned long address); | |
4796dd20 | 94 | extern int sprint_symbol_no_offset(char *buffer, unsigned long address); |
0f77a8d3 | 95 | extern int sprint_backtrace(char *buffer, unsigned long address); |
42e38083 | 96 | |
9d65cb4a | 97 | int lookup_symbol_name(unsigned long addr, char *symname); |
a5c43dae | 98 | int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name); |
9d65cb4a | 99 | |
e4a8ca3b AB |
100 | /* How and when do we show kallsyms values? */ |
101 | extern int kallsyms_show_value(void); | |
102 | ||
1da177e4 LT |
103 | #else /* !CONFIG_KALLSYMS */ |
104 | ||
105 | static inline unsigned long kallsyms_lookup_name(const char *name) | |
106 | { | |
107 | return 0; | |
108 | } | |
109 | ||
75a66614 AK |
110 | static inline int kallsyms_on_each_symbol(int (*fn)(void *, const char *, |
111 | struct module *, | |
112 | unsigned long), | |
113 | void *data) | |
114 | { | |
115 | return 0; | |
116 | } | |
117 | ||
ffc50891 FBH |
118 | static inline int kallsyms_lookup_size_offset(unsigned long addr, |
119 | unsigned long *symbolsize, | |
120 | unsigned long *offset) | |
121 | { | |
122 | return 0; | |
123 | } | |
124 | ||
1da177e4 LT |
125 | static inline const char *kallsyms_lookup(unsigned long addr, |
126 | unsigned long *symbolsize, | |
127 | unsigned long *offset, | |
128 | char **modname, char *namebuf) | |
129 | { | |
130 | return NULL; | |
131 | } | |
132 | ||
42e38083 RP |
133 | static inline int sprint_symbol(char *buffer, unsigned long addr) |
134 | { | |
135 | *buffer = '\0'; | |
136 | return 0; | |
137 | } | |
138 | ||
4796dd20 SB |
139 | static inline int sprint_symbol_no_offset(char *buffer, unsigned long addr) |
140 | { | |
141 | *buffer = '\0'; | |
142 | return 0; | |
143 | } | |
144 | ||
0f77a8d3 NK |
145 | static inline int sprint_backtrace(char *buffer, unsigned long addr) |
146 | { | |
147 | *buffer = '\0'; | |
148 | return 0; | |
149 | } | |
150 | ||
9d65cb4a AD |
151 | static inline int lookup_symbol_name(unsigned long addr, char *symname) |
152 | { | |
153 | return -ERANGE; | |
154 | } | |
155 | ||
a5c43dae AD |
156 | static inline int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name) |
157 | { | |
158 | return -ERANGE; | |
159 | } | |
160 | ||
e4a8ca3b AB |
161 | static inline int kallsyms_show_value(void) |
162 | { | |
163 | return false; | |
164 | } | |
165 | ||
1da177e4 LT |
166 | #endif /*CONFIG_KALLSYMS*/ |
167 | ||
2711b793 VN |
168 | static inline void print_ip_sym(unsigned long ip) |
169 | { | |
ca3a4569 | 170 | printk("[<%px>] %pS\n", (void *) ip, (void *) ip); |
2711b793 | 171 | } |
8d8fdf5c | 172 | |
1da177e4 | 173 | #endif /*_LINUX_KALLSYMS_H*/ |