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