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 #ifdef CONFIG_KALLSYMS 17 /* Lookup the address for a symbol. Returns 0 if not found. */ 18 unsigned long kallsyms_lookup_name(const char *name); 19 20 extern int kallsyms_lookup_size_offset(unsigned long addr, 21 unsigned long *symbolsize, 22 unsigned long *offset); 23 24 /* Lookup an address. modname is set to NULL if it's in the kernel. */ 25 const char *kallsyms_lookup(unsigned long addr, 26 unsigned long *symbolsize, 27 unsigned long *offset, 28 char **modname, char *namebuf); 29 30 /* Look up a kernel symbol and return it in a text buffer. */ 31 extern int sprint_symbol(char *buffer, unsigned long address); 32 33 /* Look up a kernel symbol and print it to the kernel messages. */ 34 extern void __print_symbol(const char *fmt, unsigned long address); 35 36 int lookup_symbol_name(unsigned long addr, char *symname); 37 int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name); 38 39 #else /* !CONFIG_KALLSYMS */ 40 41 static inline unsigned long kallsyms_lookup_name(const char *name) 42 { 43 return 0; 44 } 45 46 static inline int kallsyms_lookup_size_offset(unsigned long addr, 47 unsigned long *symbolsize, 48 unsigned long *offset) 49 { 50 return 0; 51 } 52 53 static inline const char *kallsyms_lookup(unsigned long addr, 54 unsigned long *symbolsize, 55 unsigned long *offset, 56 char **modname, char *namebuf) 57 { 58 return NULL; 59 } 60 61 static inline int sprint_symbol(char *buffer, unsigned long addr) 62 { 63 *buffer = '\0'; 64 return 0; 65 } 66 67 static inline int lookup_symbol_name(unsigned long addr, char *symname) 68 { 69 return -ERANGE; 70 } 71 72 static inline int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name) 73 { 74 return -ERANGE; 75 } 76 77 /* Stupid that this does nothing, but I didn't create this mess. */ 78 #define __print_symbol(fmt, addr) 79 #endif /*CONFIG_KALLSYMS*/ 80 81 /* This macro allows us to keep printk typechecking */ 82 static void __check_printsym_format(const char *fmt, ...) 83 __attribute__((format(printf,1,2))); 84 static inline void __check_printsym_format(const char *fmt, ...) 85 { 86 } 87 88 static inline void print_symbol(const char *fmt, unsigned long addr) 89 { 90 __check_printsym_format(fmt, ""); 91 __print_symbol(fmt, (unsigned long) 92 __builtin_extract_return_addr((void *)addr)); 93 } 94 95 /* 96 * Pretty-print a function pointer. This function is deprecated. 97 * Please use the "%pF" vsprintf format instead. 98 */ 99 static inline void __deprecated print_fn_descriptor_symbol(const char *fmt, void *addr) 100 { 101 #if defined(CONFIG_IA64) || defined(CONFIG_PPC64) 102 addr = *(void **)addr; 103 #endif 104 print_symbol(fmt, (unsigned long)addr); 105 } 106 107 static inline void print_ip_sym(unsigned long ip) 108 { 109 printk("[<%p>] %pS\n", (void *) ip, (void *) ip); 110 } 111 112 #endif /*_LINUX_KALLSYMS_H*/ 113