Commit | Line | Data |
---|---|---|
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> |
9294523e | 10 | #include <linux/buildid.h> |
2711b793 | 11 | #include <linux/kernel.h> |
5a75983e | 12 | #include <linux/stddef.h> |
04b8eb7a SS |
13 | #include <linux/mm.h> |
14 | #include <linux/module.h> | |
15 | ||
16 | #include <asm/sections.h> | |
1da177e4 | 17 | |
9281acea | 18 | #define KSYM_NAME_LEN 128 |
9294523e SB |
19 | #define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s %s]") + \ |
20 | (KSYM_NAME_LEN - 1) + \ | |
21 | 2*(BITS_PER_LONG*3/10) + (MODULE_NAME_LEN - 1) + \ | |
22 | (BUILD_ID_SIZE_MAX * 2) + 1) | |
1da177e4 | 23 | |
16025184 | 24 | struct cred; |
75a66614 AK |
25 | struct module; |
26 | ||
04b8eb7a SS |
27 | static inline int is_kernel_text(unsigned long addr) |
28 | { | |
8f6e42e8 | 29 | if (__is_kernel_text(addr)) |
04b8eb7a SS |
30 | return 1; |
31 | return in_gate_area_no_mm(addr); | |
32 | } | |
33 | ||
34 | static inline int is_kernel(unsigned long addr) | |
35 | { | |
8f6e42e8 | 36 | if (__is_kernel(addr)) |
04b8eb7a SS |
37 | return 1; |
38 | return in_gate_area_no_mm(addr); | |
39 | } | |
40 | ||
41 | static inline int is_ksym_addr(unsigned long addr) | |
42 | { | |
43 | if (IS_ENABLED(CONFIG_KALLSYMS_ALL)) | |
44 | return is_kernel(addr); | |
45 | ||
46 | return is_kernel_text(addr) || is_kernel_inittext(addr); | |
47 | } | |
48 | ||
49 | static inline void *dereference_symbol_descriptor(void *ptr) | |
50 | { | |
a257cacc | 51 | #ifdef CONFIG_HAVE_FUNCTION_DESCRIPTORS |
04b8eb7a SS |
52 | struct module *mod; |
53 | ||
54 | ptr = dereference_kernel_function_descriptor(ptr); | |
55 | if (is_ksym_addr((unsigned long)ptr)) | |
56 | return ptr; | |
57 | ||
58 | preempt_disable(); | |
59 | mod = __module_address((unsigned long)ptr); | |
60 | preempt_enable(); | |
61 | ||
62 | if (mod) | |
63 | ptr = dereference_module_function_descriptor(mod, ptr); | |
64 | #endif | |
65 | return ptr; | |
66 | } | |
67 | ||
75a66614 AK |
68 | int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *, |
69 | unsigned long), | |
70 | void *data); | |
71 | ||
3e355205 CH |
72 | #ifdef CONFIG_KALLSYMS |
73 | /* Lookup the address for a symbol. Returns 0 if not found. */ | |
74 | unsigned long kallsyms_lookup_name(const char *name); | |
75 | ||
ffc50891 FBH |
76 | extern int kallsyms_lookup_size_offset(unsigned long addr, |
77 | unsigned long *symbolsize, | |
78 | unsigned long *offset); | |
79 | ||
1da177e4 LT |
80 | /* Lookup an address. modname is set to NULL if it's in the kernel. */ |
81 | const char *kallsyms_lookup(unsigned long addr, | |
82 | unsigned long *symbolsize, | |
83 | unsigned long *offset, | |
84 | char **modname, char *namebuf); | |
85 | ||
42e38083 RP |
86 | /* Look up a kernel symbol and return it in a text buffer. */ |
87 | extern int sprint_symbol(char *buffer, unsigned long address); | |
9294523e | 88 | extern int sprint_symbol_build_id(char *buffer, unsigned long address); |
4796dd20 | 89 | extern int sprint_symbol_no_offset(char *buffer, unsigned long address); |
0f77a8d3 | 90 | extern int sprint_backtrace(char *buffer, unsigned long address); |
9294523e | 91 | extern int sprint_backtrace_build_id(char *buffer, unsigned long address); |
42e38083 | 92 | |
9d65cb4a | 93 | int lookup_symbol_name(unsigned long addr, char *symname); |
a5c43dae | 94 | int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name); |
9d65cb4a | 95 | |
e4a8ca3b | 96 | /* How and when do we show kallsyms values? */ |
16025184 | 97 | extern bool kallsyms_show_value(const struct cred *cred); |
e4a8ca3b | 98 | |
1da177e4 LT |
99 | #else /* !CONFIG_KALLSYMS */ |
100 | ||
101 | static inline unsigned long kallsyms_lookup_name(const char *name) | |
102 | { | |
103 | return 0; | |
104 | } | |
105 | ||
ffc50891 FBH |
106 | static inline int kallsyms_lookup_size_offset(unsigned long addr, |
107 | unsigned long *symbolsize, | |
108 | unsigned long *offset) | |
109 | { | |
110 | return 0; | |
111 | } | |
112 | ||
1da177e4 LT |
113 | static inline const char *kallsyms_lookup(unsigned long addr, |
114 | unsigned long *symbolsize, | |
115 | unsigned long *offset, | |
116 | char **modname, char *namebuf) | |
117 | { | |
118 | return NULL; | |
119 | } | |
120 | ||
42e38083 RP |
121 | static inline int sprint_symbol(char *buffer, unsigned long addr) |
122 | { | |
123 | *buffer = '\0'; | |
124 | return 0; | |
125 | } | |
126 | ||
9294523e SB |
127 | static inline int sprint_symbol_build_id(char *buffer, unsigned long address) |
128 | { | |
129 | *buffer = '\0'; | |
130 | return 0; | |
131 | } | |
132 | ||
4796dd20 SB |
133 | static inline int sprint_symbol_no_offset(char *buffer, unsigned long addr) |
134 | { | |
135 | *buffer = '\0'; | |
136 | return 0; | |
137 | } | |
138 | ||
0f77a8d3 NK |
139 | static inline int sprint_backtrace(char *buffer, unsigned long addr) |
140 | { | |
141 | *buffer = '\0'; | |
142 | return 0; | |
143 | } | |
144 | ||
9294523e SB |
145 | static inline int sprint_backtrace_build_id(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 | ||
16025184 | 161 | static inline bool kallsyms_show_value(const struct cred *cred) |
e4a8ca3b AB |
162 | { |
163 | return false; | |
164 | } | |
165 | ||
1da177e4 LT |
166 | #endif /*CONFIG_KALLSYMS*/ |
167 | ||
2062a4e8 | 168 | static inline void print_ip_sym(const char *loglvl, unsigned long ip) |
2711b793 | 169 | { |
2062a4e8 | 170 | printk("%s[<%px>] %pS\n", loglvl, (void *) ip, (void *) ip); |
2711b793 | 171 | } |
8d8fdf5c | 172 | |
1da177e4 | 173 | #endif /*_LINUX_KALLSYMS_H*/ |