1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* Rewritten and vastly simplified by Rusty Russell for in-kernel 3 * module loader: 4 * Copyright 2002 Rusty Russell <[email protected]> IBM Corporation 5 */ 6 #ifndef _LINUX_KALLSYMS_H 7 #define _LINUX_KALLSYMS_H 8 9 #include <linux/errno.h> 10 #include <linux/kernel.h> 11 #include <linux/stddef.h> 12 13 #define KSYM_NAME_LEN 128 14 #define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s]") + (KSYM_NAME_LEN - 1) + \ 15 2*(BITS_PER_LONG*3/10) + (MODULE_NAME_LEN - 1) + 1) 16 17 struct module; 18 19 #ifdef CONFIG_KALLSYMS 20 /* Lookup the address for a symbol. Returns 0 if not found. */ 21 unsigned long kallsyms_lookup_name(const char *name); 22 23 /* Call a function on each kallsyms symbol in the core kernel */ 24 int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *, 25 unsigned long), 26 void *data); 27 28 extern int kallsyms_lookup_size_offset(unsigned long addr, 29 unsigned long *symbolsize, 30 unsigned long *offset); 31 32 /* Lookup an address. modname is set to NULL if it's in the kernel. */ 33 const char *kallsyms_lookup(unsigned long addr, 34 unsigned long *symbolsize, 35 unsigned long *offset, 36 char **modname, char *namebuf); 37 38 /* Look up a kernel symbol and return it in a text buffer. */ 39 extern int sprint_symbol(char *buffer, unsigned long address); 40 extern int sprint_symbol_no_offset(char *buffer, unsigned long address); 41 extern int sprint_backtrace(char *buffer, unsigned long address); 42 43 /* Look up a kernel symbol and print it to the kernel messages. */ 44 extern void __print_symbol(const char *fmt, unsigned long address); 45 46 int lookup_symbol_name(unsigned long addr, char *symname); 47 int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name); 48 49 #else /* !CONFIG_KALLSYMS */ 50 51 static inline unsigned long kallsyms_lookup_name(const char *name) 52 { 53 return 0; 54 } 55 56 static inline int kallsyms_on_each_symbol(int (*fn)(void *, const char *, 57 struct module *, 58 unsigned long), 59 void *data) 60 { 61 return 0; 62 } 63 64 static inline int kallsyms_lookup_size_offset(unsigned long addr, 65 unsigned long *symbolsize, 66 unsigned long *offset) 67 { 68 return 0; 69 } 70 71 static inline const char *kallsyms_lookup(unsigned long addr, 72 unsigned long *symbolsize, 73 unsigned long *offset, 74 char **modname, char *namebuf) 75 { 76 return NULL; 77 } 78 79 static inline int sprint_symbol(char *buffer, unsigned long addr) 80 { 81 *buffer = '\0'; 82 return 0; 83 } 84 85 static inline int sprint_symbol_no_offset(char *buffer, unsigned long addr) 86 { 87 *buffer = '\0'; 88 return 0; 89 } 90 91 static inline int sprint_backtrace(char *buffer, unsigned long addr) 92 { 93 *buffer = '\0'; 94 return 0; 95 } 96 97 static inline int lookup_symbol_name(unsigned long addr, char *symname) 98 { 99 return -ERANGE; 100 } 101 102 static inline int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name) 103 { 104 return -ERANGE; 105 } 106 107 /* Stupid that this does nothing, but I didn't create this mess. */ 108 #define __print_symbol(fmt, addr) 109 #endif /*CONFIG_KALLSYMS*/ 110 111 /* This macro allows us to keep printk typechecking */ 112 static __printf(1, 2) 113 void __check_printsym_format(const char *fmt, ...) 114 { 115 } 116 117 static inline void print_symbol(const char *fmt, unsigned long addr) 118 { 119 __check_printsym_format(fmt, ""); 120 __print_symbol(fmt, (unsigned long) 121 __builtin_extract_return_addr((void *)addr)); 122 } 123 124 static inline void print_ip_sym(unsigned long ip) 125 { 126 printk("[<%p>] %pS\n", (void *) ip, (void *) ip); 127 } 128 129 #endif /*_LINUX_KALLSYMS_H*/ 130