1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* Rewritten and vastly simplified by Rusty Ru 2 /* Rewritten and vastly simplified by Rusty Russell for in-kernel
3 * module loader: 3 * module loader:
4 * Copyright 2002 Rusty Russell <rusty@rustc 4 * Copyright 2002 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
5 */ 5 */
6 #ifndef _LINUX_KALLSYMS_H 6 #ifndef _LINUX_KALLSYMS_H
7 #define _LINUX_KALLSYMS_H 7 #define _LINUX_KALLSYMS_H
8 8
9 #include <linux/errno.h> 9 #include <linux/errno.h>
10 #include <linux/buildid.h> 10 #include <linux/buildid.h>
11 #include <linux/kernel.h> 11 #include <linux/kernel.h>
12 #include <linux/stddef.h> 12 #include <linux/stddef.h>
13 #include <linux/mm.h> 13 #include <linux/mm.h>
14 #include <linux/module.h> 14 #include <linux/module.h>
15 15
16 #include <asm/sections.h> 16 #include <asm/sections.h>
17 17
18 #define KSYM_NAME_LEN 512 18 #define KSYM_NAME_LEN 512
19 #define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx 19 #define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s %s]") + \
20 (KSYM_NAME_LEN - 1) + 20 (KSYM_NAME_LEN - 1) + \
21 2*(BITS_PER_LONG*3/10) 21 2*(BITS_PER_LONG*3/10) + (MODULE_NAME_LEN - 1) + \
22 (BUILD_ID_SIZE_MAX * 2 22 (BUILD_ID_SIZE_MAX * 2) + 1)
23 23
24 struct cred; 24 struct cred;
25 struct module; 25 struct module;
26 26
27 static inline int is_kernel_text(unsigned long 27 static inline int is_kernel_text(unsigned long addr)
28 { 28 {
29 if (__is_kernel_text(addr)) 29 if (__is_kernel_text(addr))
30 return 1; 30 return 1;
31 return in_gate_area_no_mm(addr); 31 return in_gate_area_no_mm(addr);
32 } 32 }
33 33
34 static inline int is_kernel(unsigned long addr 34 static inline int is_kernel(unsigned long addr)
35 { 35 {
36 if (__is_kernel(addr)) 36 if (__is_kernel(addr))
37 return 1; 37 return 1;
38 return in_gate_area_no_mm(addr); 38 return in_gate_area_no_mm(addr);
39 } 39 }
40 40
41 static inline int is_ksym_addr(unsigned long a 41 static inline int is_ksym_addr(unsigned long addr)
42 { 42 {
43 if (IS_ENABLED(CONFIG_KALLSYMS_ALL)) 43 if (IS_ENABLED(CONFIG_KALLSYMS_ALL))
44 return is_kernel(addr); 44 return is_kernel(addr);
45 45
46 return is_kernel_text(addr) || is_kern 46 return is_kernel_text(addr) || is_kernel_inittext(addr);
47 } 47 }
48 48
49 static inline void *dereference_symbol_descrip 49 static inline void *dereference_symbol_descriptor(void *ptr)
50 { 50 {
51 #ifdef CONFIG_HAVE_FUNCTION_DESCRIPTORS 51 #ifdef CONFIG_HAVE_FUNCTION_DESCRIPTORS
52 struct module *mod; 52 struct module *mod;
53 53
54 ptr = dereference_kernel_function_desc 54 ptr = dereference_kernel_function_descriptor(ptr);
55 if (is_ksym_addr((unsigned long)ptr)) 55 if (is_ksym_addr((unsigned long)ptr))
56 return ptr; 56 return ptr;
57 57
58 preempt_disable(); 58 preempt_disable();
59 mod = __module_address((unsigned long) 59 mod = __module_address((unsigned long)ptr);
60 preempt_enable(); 60 preempt_enable();
61 61
62 if (mod) 62 if (mod)
63 ptr = dereference_module_funct 63 ptr = dereference_module_function_descriptor(mod, ptr);
64 #endif 64 #endif
65 return ptr; 65 return ptr;
66 } 66 }
67 67
68 /* How and when do we show kallsyms values? */ 68 /* How and when do we show kallsyms values? */
69 extern bool kallsyms_show_value(const struct c 69 extern bool kallsyms_show_value(const struct cred *cred);
70 70
71 #ifdef CONFIG_KALLSYMS 71 #ifdef CONFIG_KALLSYMS
72 unsigned long kallsyms_sym_address(int idx); 72 unsigned long kallsyms_sym_address(int idx);
73 int kallsyms_on_each_symbol(int (*fn)(void *, 73 int kallsyms_on_each_symbol(int (*fn)(void *, const char *, unsigned long),
74 void *data); 74 void *data);
75 int kallsyms_on_each_match_symbol(int (*fn)(vo 75 int kallsyms_on_each_match_symbol(int (*fn)(void *, unsigned long),
76 const char * 76 const char *name, void *data);
77 77
78 /* Lookup the address for a symbol. Returns 0 78 /* Lookup the address for a symbol. Returns 0 if not found. */
79 unsigned long kallsyms_lookup_name(const char 79 unsigned long kallsyms_lookup_name(const char *name);
80 80
81 extern int kallsyms_lookup_size_offset(unsigne 81 extern int kallsyms_lookup_size_offset(unsigned long addr,
82 unsigned lon 82 unsigned long *symbolsize,
83 unsigned lon 83 unsigned long *offset);
84 84
85 /* Lookup an address. modname is set to NULL 85 /* Lookup an address. modname is set to NULL if it's in the kernel. */
86 const char *kallsyms_lookup(unsigned long addr 86 const char *kallsyms_lookup(unsigned long addr,
87 unsigned long *sym 87 unsigned long *symbolsize,
88 unsigned long *off 88 unsigned long *offset,
89 char **modname, ch 89 char **modname, char *namebuf);
90 90
91 /* Look up a kernel symbol and return it in a 91 /* Look up a kernel symbol and return it in a text buffer. */
92 extern int sprint_symbol(char *buffer, unsigne 92 extern int sprint_symbol(char *buffer, unsigned long address);
93 extern int sprint_symbol_build_id(char *buffer 93 extern int sprint_symbol_build_id(char *buffer, unsigned long address);
94 extern int sprint_symbol_no_offset(char *buffe 94 extern int sprint_symbol_no_offset(char *buffer, unsigned long address);
95 extern int sprint_backtrace(char *buffer, unsi 95 extern int sprint_backtrace(char *buffer, unsigned long address);
96 extern int sprint_backtrace_build_id(char *buf 96 extern int sprint_backtrace_build_id(char *buffer, unsigned long address);
97 97
98 int lookup_symbol_name(unsigned long addr, cha 98 int lookup_symbol_name(unsigned long addr, char *symname);
99 99
100 #else /* !CONFIG_KALLSYMS */ 100 #else /* !CONFIG_KALLSYMS */
101 101
102 static inline unsigned long kallsyms_lookup_na 102 static inline unsigned long kallsyms_lookup_name(const char *name)
103 { 103 {
104 return 0; 104 return 0;
105 } 105 }
106 106
107 static inline int kallsyms_lookup_size_offset( 107 static inline int kallsyms_lookup_size_offset(unsigned long addr,
108 108 unsigned long *symbolsize,
109 109 unsigned long *offset)
110 { 110 {
111 return 0; 111 return 0;
112 } 112 }
113 113
114 static inline const char *kallsyms_lookup(unsi 114 static inline const char *kallsyms_lookup(unsigned long addr,
115 unsi 115 unsigned long *symbolsize,
116 unsi 116 unsigned long *offset,
117 char 117 char **modname, char *namebuf)
118 { 118 {
119 return NULL; 119 return NULL;
120 } 120 }
121 121
122 static inline int sprint_symbol(char *buffer, 122 static inline int sprint_symbol(char *buffer, unsigned long addr)
123 { 123 {
124 *buffer = '\0'; 124 *buffer = '\0';
125 return 0; 125 return 0;
126 } 126 }
127 127
128 static inline int sprint_symbol_build_id(char 128 static inline int sprint_symbol_build_id(char *buffer, unsigned long address)
129 { 129 {
130 *buffer = '\0'; 130 *buffer = '\0';
131 return 0; 131 return 0;
132 } 132 }
133 133
134 static inline int sprint_symbol_no_offset(char 134 static inline int sprint_symbol_no_offset(char *buffer, unsigned long addr)
135 { 135 {
136 *buffer = '\0'; 136 *buffer = '\0';
137 return 0; 137 return 0;
138 } 138 }
139 139
140 static inline int sprint_backtrace(char *buffe 140 static inline int sprint_backtrace(char *buffer, unsigned long addr)
141 { 141 {
142 *buffer = '\0'; 142 *buffer = '\0';
143 return 0; 143 return 0;
144 } 144 }
145 145
146 static inline int sprint_backtrace_build_id(ch 146 static inline int sprint_backtrace_build_id(char *buffer, unsigned long addr)
147 { 147 {
148 *buffer = '\0'; 148 *buffer = '\0';
149 return 0; 149 return 0;
150 } 150 }
151 151
152 static inline int lookup_symbol_name(unsigned 152 static inline int lookup_symbol_name(unsigned long addr, char *symname)
153 { 153 {
154 return -ERANGE; 154 return -ERANGE;
155 } 155 }
156 156
157 static inline int kallsyms_on_each_symbol(int 157 static inline int kallsyms_on_each_symbol(int (*fn)(void *, const char *, unsigned long),
158 void 158 void *data)
159 { 159 {
160 return -EOPNOTSUPP; 160 return -EOPNOTSUPP;
161 } 161 }
162 162
163 static inline int kallsyms_on_each_match_symbo 163 static inline int kallsyms_on_each_match_symbol(int (*fn)(void *, unsigned long),
164 164 const char *name, void *data)
165 { 165 {
166 return -EOPNOTSUPP; 166 return -EOPNOTSUPP;
167 } 167 }
168 #endif /*CONFIG_KALLSYMS*/ 168 #endif /*CONFIG_KALLSYMS*/
169 169
170 static inline void print_ip_sym(const char *lo 170 static inline void print_ip_sym(const char *loglvl, unsigned long ip)
171 { 171 {
172 printk("%s[<%px>] %pS\n", loglvl, (voi 172 printk("%s[<%px>] %pS\n", loglvl, (void *) ip, (void *) ip);
173 } 173 }
174 174
175 #endif /*_LINUX_KALLSYMS_H*/ 175 #endif /*_LINUX_KALLSYMS_H*/
176 176
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