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1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* Rewritten and vastly simplified by Rusty Russell for in-kernel
4 * Copyright 2002 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
6 #ifndef _LINUX_KALLSYMS_H
7 #define _LINUX_KALLSYMS_H
9 #include <linux/errno.h>
10 #include <linux/kernel.h>
11 #include <linux/stddef.h>
13 #include <linux/module.h>
15 #include <asm/sections.h>
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)
24 static inline int is_kernel_inittext(unsigned long addr
)
26 if (addr
>= (unsigned long)_sinittext
27 && addr
<= (unsigned long)_einittext
)
32 static inline int is_kernel_text(unsigned long addr
)
34 if ((addr
>= (unsigned long)_stext
&& addr
<= (unsigned long)_etext
) ||
35 arch_is_kernel_text(addr
))
37 return in_gate_area_no_mm(addr
);
40 static inline int is_kernel(unsigned long addr
)
42 if (addr
>= (unsigned long)_stext
&& addr
<= (unsigned long)_end
)
44 return in_gate_area_no_mm(addr
);
47 static inline int is_ksym_addr(unsigned long addr
)
49 if (IS_ENABLED(CONFIG_KALLSYMS_ALL
))
50 return is_kernel(addr
);
52 return is_kernel_text(addr
) || is_kernel_inittext(addr
);
55 static inline void *dereference_symbol_descriptor(void *ptr
)
57 #ifdef HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR
60 ptr
= dereference_kernel_function_descriptor(ptr
);
61 if (is_ksym_addr((unsigned long)ptr
))
65 mod
= __module_address((unsigned long)ptr
);
69 ptr
= dereference_module_function_descriptor(mod
, ptr
);
74 int kallsyms_on_each_symbol(int (*fn
)(void *, const char *, struct module
*,
78 #ifdef CONFIG_KALLSYMS
79 /* Lookup the address for a symbol. Returns 0 if not found. */
80 unsigned long kallsyms_lookup_name(const char *name
);
82 extern int kallsyms_lookup_size_offset(unsigned long addr
,
83 unsigned long *symbolsize
,
84 unsigned long *offset
);
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
);
92 /* Look up a kernel symbol and return it in a text buffer. */
93 extern int sprint_symbol(char *buffer
, unsigned long address
);
94 extern int sprint_symbol_no_offset(char *buffer
, unsigned long address
);
95 extern int sprint_backtrace(char *buffer
, unsigned long address
);
97 int lookup_symbol_name(unsigned long addr
, char *symname
);
98 int lookup_symbol_attrs(unsigned long addr
, unsigned long *size
, unsigned long *offset
, char *modname
, char *name
);
100 /* How and when do we show kallsyms values? */
101 extern bool kallsyms_show_value(const struct cred
*cred
);
103 #else /* !CONFIG_KALLSYMS */
105 static inline unsigned long kallsyms_lookup_name(const char *name
)
110 static inline int kallsyms_lookup_size_offset(unsigned long addr
,
111 unsigned long *symbolsize
,
112 unsigned long *offset
)
117 static inline const char *kallsyms_lookup(unsigned long addr
,
118 unsigned long *symbolsize
,
119 unsigned long *offset
,
120 char **modname
, char *namebuf
)
125 static inline int sprint_symbol(char *buffer
, unsigned long addr
)
131 static inline int sprint_symbol_no_offset(char *buffer
, unsigned long addr
)
137 static inline int sprint_backtrace(char *buffer
, unsigned long addr
)
143 static inline int lookup_symbol_name(unsigned long addr
, char *symname
)
148 static inline int lookup_symbol_attrs(unsigned long addr
, unsigned long *size
, unsigned long *offset
, char *modname
, char *name
)
153 static inline bool kallsyms_show_value(const struct cred
*cred
)
158 #endif /*CONFIG_KALLSYMS*/
160 static inline void print_ip_sym(const char *loglvl
, unsigned long ip
)
162 printk("%s[<%px>] %pS\n", loglvl
, (void *) ip
, (void *) ip
);
165 #endif /*_LINUX_KALLSYMS_H*/