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_backtrace(char *buffer, unsigned long address); 40 41 /* Look up a kernel symbol and print it to the kernel messages. */ 42 extern void __print_symbol(const char *fmt, unsigned long address); 43 44 int lookup_symbol_name(unsigned long addr, char *symname); 45 int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name); 46 47 #else /* !CONFIG_KALLSYMS */ 48 49 static inline unsigned long kallsyms_lookup_name(const char *name) 50 { 51 return 0; 52 } 53 54 static inline int kallsyms_on_each_symbol(int (*fn)(void *, const char *, 55 struct module *, 56 unsigned long), 57 void *data) 58 { 59 return 0; 60 } 61 62 static inline int kallsyms_lookup_size_offset(unsigned long addr, 63 unsigned long *symbolsize, 64 unsigned long *offset) 65 { 66 return 0; 67 } 68 69 static inline const char *kallsyms_lookup(unsigned long addr, 70 unsigned long *symbolsize, 71 unsigned long *offset, 72 char **modname, char *namebuf) 73 { 74 return NULL; 75 } 76 77 static inline int sprint_symbol(char *buffer, unsigned long addr) 78 { 79 *buffer = '\0'; 80 return 0; 81 } 82 83 static inline int sprint_backtrace(char *buffer, unsigned long addr) 84 { 85 *buffer = '\0'; 86 return 0; 87 } 88 89 static inline int lookup_symbol_name(unsigned long addr, char *symname) 90 { 91 return -ERANGE; 92 } 93 94 static inline int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name) 95 { 96 return -ERANGE; 97 } 98 99 /* Stupid that this does nothing, but I didn't create this mess. */ 100 #define __print_symbol(fmt, addr) 101 #endif /*CONFIG_KALLSYMS*/ 102 103 /* This macro allows us to keep printk typechecking */ 104 static void __check_printsym_format(const char *fmt, ...) 105 __attribute__((format(printf,1,2))); 106 static inline void __check_printsym_format(const char *fmt, ...) 107 { 108 } 109 110 static inline void print_symbol(const char *fmt, unsigned long addr) 111 { 112 __check_printsym_format(fmt, ""); 113 __print_symbol(fmt, (unsigned long) 114 __builtin_extract_return_addr((void *)addr)); 115 } 116 117 static inline void print_ip_sym(unsigned long ip) 118 { 119 printk("[<%p>] %pS\n", (void *) ip, (void *) ip); 120 } 121 122 #endif /*_LINUX_KALLSYMS_H*/ 123