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1da177e4 LT |
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> | |
8b96f011 | 20 | #include <linux/ftrace.h> |
1da177e4 LT |
21 | #include <asm/uaccess.h> |
22 | #include <asm/sections.h> | |
23 | ||
24 | extern struct exception_table_entry __start___ex_table[]; | |
25 | extern struct exception_table_entry __stop___ex_table[]; | |
26 | ||
27 | /* Sort the kernel's built-in exception table */ | |
28 | void __init sort_main_extable(void) | |
29 | { | |
30 | sort_extable(__start___ex_table, __stop___ex_table); | |
31 | } | |
32 | ||
33 | /* Given an address, look for it in the exception tables. */ | |
34 | const struct exception_table_entry *search_exception_tables(unsigned long addr) | |
35 | { | |
36 | const struct exception_table_entry *e; | |
37 | ||
38 | e = search_extable(__start___ex_table, __stop___ex_table-1, addr); | |
39 | if (!e) | |
40 | e = search_module_extables(addr); | |
41 | return e; | |
42 | } | |
43 | ||
8b96f011 | 44 | __notrace_funcgraph int core_kernel_text(unsigned long addr) |
1da177e4 LT |
45 | { |
46 | if (addr >= (unsigned long)_stext && | |
47 | addr <= (unsigned long)_etext) | |
48 | return 1; | |
49 | ||
a2da4052 RR |
50 | if (system_state == SYSTEM_BOOTING && |
51 | addr >= (unsigned long)_sinittext && | |
1da177e4 LT |
52 | addr <= (unsigned long)_einittext) |
53 | return 1; | |
54 | return 0; | |
55 | } | |
56 | ||
8b96f011 | 57 | __notrace_funcgraph int __kernel_text_address(unsigned long addr) |
1da177e4 LT |
58 | { |
59 | if (core_kernel_text(addr)) | |
60 | return 1; | |
61 | return __module_text_address(addr) != NULL; | |
62 | } | |
63 | ||
64 | int kernel_text_address(unsigned long addr) | |
65 | { | |
66 | if (core_kernel_text(addr)) | |
67 | return 1; | |
68 | return module_text_address(addr) != NULL; | |
69 | } | |
ab7476cf AV |
70 | |
71 | /* | |
72 | * On some architectures (PPC64, IA64) function pointers | |
73 | * are actually only tokens to some data that then holds the | |
74 | * real function address. As a result, to find if a function | |
75 | * pointer is part of the kernel text, we need to do some | |
76 | * special dereferencing first. | |
77 | */ | |
78 | int func_ptr_is_kernel_text(void *ptr) | |
79 | { | |
80 | unsigned long addr; | |
81 | addr = (unsigned long) dereference_function_descriptor(ptr); | |
82 | if (core_kernel_text(addr)) | |
83 | return 1; | |
84 | return module_text_address(addr) != NULL; | |
85 | } |