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 10 #define KSYM_NAME_LEN 128 11 #define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s]") + (KSYM_NAME_LEN - 1) + \ 12 2*(BITS_PER_LONG*3/10) + (MODULE_NAME_LEN - 1) + 1) 13 14 #ifdef CONFIG_KALLSYMS 15 /* Lookup the address for a symbol. Returns 0 if not found. */ 16 unsigned long kallsyms_lookup_name(const char *name); 17 18 extern int kallsyms_lookup_size_offset(unsigned long addr, 19 unsigned long *symbolsize, 20 unsigned long *offset); 21 22 /* Lookup an address. modname is set to NULL if it's in the kernel. */ 23 const char *kallsyms_lookup(unsigned long addr, 24 unsigned long *symbolsize, 25 unsigned long *offset, 26 char **modname, char *namebuf); 27 28 /* Look up a kernel symbol and return it in a text buffer. */ 29 extern int sprint_symbol(char *buffer, unsigned long address); 30 31 /* Look up a kernel symbol and print it to the kernel messages. */ 32 extern void __print_symbol(const char *fmt, unsigned long address); 33 34 int lookup_symbol_name(unsigned long addr, char *symname); 35 int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name); 36 37 #else /* !CONFIG_KALLSYMS */ 38 39 static inline unsigned long kallsyms_lookup_name(const char *name) 40 { 41 return 0; 42 } 43 44 static inline int kallsyms_lookup_size_offset(unsigned long addr, 45 unsigned long *symbolsize, 46 unsigned long *offset) 47 { 48 return 0; 49 } 50 51 static inline const char *kallsyms_lookup(unsigned long addr, 52 unsigned long *symbolsize, 53 unsigned long *offset, 54 char **modname, char *namebuf) 55 { 56 return NULL; 57 } 58 59 static inline int sprint_symbol(char *buffer, unsigned long addr) 60 { 61 *buffer = '\0'; 62 return 0; 63 } 64 65 static inline int lookup_symbol_name(unsigned long addr, char *symname) 66 { 67 return -ERANGE; 68 } 69 70 static inline int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name) 71 { 72 return -ERANGE; 73 } 74 75 /* Stupid that this does nothing, but I didn't create this mess. */ 76 #define __print_symbol(fmt, addr) 77 #endif /*CONFIG_KALLSYMS*/ 78 79 /* This macro allows us to keep printk typechecking */ 80 static void __check_printsym_format(const char *fmt, ...) 81 __attribute__((format(printf,1,2))); 82 static inline void __check_printsym_format(const char *fmt, ...) 83 { 84 } 85 /* ia64 and ppc64 use function descriptors, which contain the real address */ 86 #if defined(CONFIG_IA64) || defined(CONFIG_PPC64) 87 #define print_fn_descriptor_symbol(fmt, addr) \ 88 do { \ 89 unsigned long *__faddr = (unsigned long*) addr; \ 90 print_symbol(fmt, __faddr[0]); \ 91 } while (0) 92 #else 93 #define print_fn_descriptor_symbol(fmt, addr) print_symbol(fmt, addr) 94 #endif 95 96 static inline void print_symbol(const char *fmt, unsigned long addr) 97 { 98 __check_printsym_format(fmt, ""); 99 __print_symbol(fmt, (unsigned long) 100 __builtin_extract_return_addr((void *)addr)); 101 } 102 103 #ifndef CONFIG_64BIT 104 #define print_ip_sym(ip) \ 105 do { \ 106 printk("[<%08lx>]", ip); \ 107 print_symbol(" %s\n", ip); \ 108 } while(0) 109 #else 110 #define print_ip_sym(ip) \ 111 do { \ 112 printk("[<%016lx>]", ip); \ 113 print_symbol(" %s\n", ip); \ 114 } while(0) 115 #endif 116 117 #endif /*_LINUX_KALLSYMS_H*/ 118