| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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 | static 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 (addr >= (unsigned long)_sinittext && |
| 50 | addr <= (unsigned long)_einittext) |
| 51 | return 1; |
| 52 | return 0; |
| 53 | } |
| 54 | |
| 55 | int __kernel_text_address(unsigned long addr) |
| 56 | { |
| 57 | if (core_kernel_text(addr)) |
| 58 | return 1; |
| 59 | return __module_text_address(addr) != NULL; |
| 60 | } |
| 61 | |
| 62 | int kernel_text_address(unsigned long addr) |
| 63 | { |
| 64 | if (core_kernel_text(addr)) |
| 65 | return 1; |
| 66 | return module_text_address(addr) != NULL; |
| 67 | } |