1*1da177e4SLinus Torvalds /* Rewritten by Rusty Russell, on the backs of many others... 2*1da177e4SLinus Torvalds Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM. 3*1da177e4SLinus Torvalds 4*1da177e4SLinus Torvalds This program is free software; you can redistribute it and/or modify 5*1da177e4SLinus Torvalds it under the terms of the GNU General Public License as published by 6*1da177e4SLinus Torvalds the Free Software Foundation; either version 2 of the License, or 7*1da177e4SLinus Torvalds (at your option) any later version. 8*1da177e4SLinus Torvalds 9*1da177e4SLinus Torvalds This program is distributed in the hope that it will be useful, 10*1da177e4SLinus Torvalds but WITHOUT ANY WARRANTY; without even the implied warranty of 11*1da177e4SLinus Torvalds MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12*1da177e4SLinus Torvalds GNU General Public License for more details. 13*1da177e4SLinus Torvalds 14*1da177e4SLinus Torvalds You should have received a copy of the GNU General Public License 15*1da177e4SLinus Torvalds along with this program; if not, write to the Free Software 16*1da177e4SLinus Torvalds Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 17*1da177e4SLinus Torvalds */ 18*1da177e4SLinus Torvalds #include <linux/module.h> 19*1da177e4SLinus Torvalds #include <linux/init.h> 20*1da177e4SLinus Torvalds #include <asm/uaccess.h> 21*1da177e4SLinus Torvalds #include <asm/sections.h> 22*1da177e4SLinus Torvalds 23*1da177e4SLinus Torvalds extern struct exception_table_entry __start___ex_table[]; 24*1da177e4SLinus Torvalds extern struct exception_table_entry __stop___ex_table[]; 25*1da177e4SLinus Torvalds 26*1da177e4SLinus Torvalds /* Sort the kernel's built-in exception table */ 27*1da177e4SLinus Torvalds void __init sort_main_extable(void) 28*1da177e4SLinus Torvalds { 29*1da177e4SLinus Torvalds sort_extable(__start___ex_table, __stop___ex_table); 30*1da177e4SLinus Torvalds } 31*1da177e4SLinus Torvalds 32*1da177e4SLinus Torvalds /* Given an address, look for it in the exception tables. */ 33*1da177e4SLinus Torvalds const struct exception_table_entry *search_exception_tables(unsigned long addr) 34*1da177e4SLinus Torvalds { 35*1da177e4SLinus Torvalds const struct exception_table_entry *e; 36*1da177e4SLinus Torvalds 37*1da177e4SLinus Torvalds e = search_extable(__start___ex_table, __stop___ex_table-1, addr); 38*1da177e4SLinus Torvalds if (!e) 39*1da177e4SLinus Torvalds e = search_module_extables(addr); 40*1da177e4SLinus Torvalds return e; 41*1da177e4SLinus Torvalds } 42*1da177e4SLinus Torvalds 43*1da177e4SLinus Torvalds static int core_kernel_text(unsigned long addr) 44*1da177e4SLinus Torvalds { 45*1da177e4SLinus Torvalds if (addr >= (unsigned long)_stext && 46*1da177e4SLinus Torvalds addr <= (unsigned long)_etext) 47*1da177e4SLinus Torvalds return 1; 48*1da177e4SLinus Torvalds 49*1da177e4SLinus Torvalds if (addr >= (unsigned long)_sinittext && 50*1da177e4SLinus Torvalds addr <= (unsigned long)_einittext) 51*1da177e4SLinus Torvalds return 1; 52*1da177e4SLinus Torvalds return 0; 53*1da177e4SLinus Torvalds } 54*1da177e4SLinus Torvalds 55*1da177e4SLinus Torvalds int __kernel_text_address(unsigned long addr) 56*1da177e4SLinus Torvalds { 57*1da177e4SLinus Torvalds if (core_kernel_text(addr)) 58*1da177e4SLinus Torvalds return 1; 59*1da177e4SLinus Torvalds return __module_text_address(addr) != NULL; 60*1da177e4SLinus Torvalds } 61*1da177e4SLinus Torvalds 62*1da177e4SLinus Torvalds int kernel_text_address(unsigned long addr) 63*1da177e4SLinus Torvalds { 64*1da177e4SLinus Torvalds if (core_kernel_text(addr)) 65*1da177e4SLinus Torvalds return 1; 66*1da177e4SLinus Torvalds return module_text_address(addr) != NULL; 67*1da177e4SLinus Torvalds } 68