1 /* Rewritten by Rusty Russell, on the backs of many others... 2 Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM. 3 4 This program is free software; you can redistribute it and/or modify 5 it under the terms of the GNU General Public License as published by 6 the Free Software Foundation; either version 2 of the License, or 7 (at your option) any later version. 8 9 This program is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 GNU General Public License for more details. 13 14 You should have received a copy of the GNU General Public License 15 along with this program; if not, write to the Free Software 16 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 17 */ 18 #include <linux/module.h> 19 #include <linux/init.h> 20 #include <asm/uaccess.h> 21 #include <asm/sections.h> 22 23 extern struct exception_table_entry __start___ex_table[]; 24 extern struct exception_table_entry __stop___ex_table[]; 25 26 /* Sort the kernel's built-in exception table */ 27 void __init sort_main_extable(void) 28 { 29 sort_extable(__start___ex_table, __stop___ex_table); 30 } 31 32 /* Given an address, look for it in the exception tables. */ 33 const struct exception_table_entry *search_exception_tables(unsigned long addr) 34 { 35 const struct exception_table_entry *e; 36 37 e = search_extable(__start___ex_table, __stop___ex_table-1, addr); 38 if (!e) 39 e = search_module_extables(addr); 40 return e; 41 } 42 43 int core_kernel_text(unsigned long addr) 44 { 45 if (addr >= (unsigned long)_stext && 46 addr <= (unsigned long)_etext) 47 return 1; 48 49 if (system_state == SYSTEM_BOOTING && 50 addr >= (unsigned long)_sinittext && 51 addr <= (unsigned long)_einittext) 52 return 1; 53 return 0; 54 } 55 56 int __kernel_text_address(unsigned long addr) 57 { 58 if (core_kernel_text(addr)) 59 return 1; 60 return __module_text_address(addr) != NULL; 61 } 62 63 int kernel_text_address(unsigned long addr) 64 { 65 if (core_kernel_text(addr)) 66 return 1; 67 return module_text_address(addr) != NULL; 68 } 69