1 /*
2 * Copyright (C) 2009 Dan Carpenter.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (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, see http://www.gnu.org/copyleft/gpl.txt
16 */
17
18 #include "smatch.h"
19
20 static int my_id;
21
match_dma_func(const char * fn,struct expression * expr,void * param)22 static void match_dma_func(const char *fn, struct expression *expr, void *param)
23 {
24 struct expression *arg;
25 struct symbol *sym;
26 char *name;
27
28 arg = get_argument_from_call_expr(expr->args, PTR_INT(param));
29 arg = strip_expr(arg);
30 if (!arg)
31 return;
32 if (arg->type == EXPR_PREOP && arg->op == '&') {
33 if (arg->unop->type != EXPR_SYMBOL)
34 return;
35 name = expr_to_str(arg);
36 sm_error("doing dma on the stack (%s)", name);
37 free_string(name);
38 return;
39 }
40 if (arg->type != EXPR_SYMBOL)
41 return;
42 sym = get_type(arg);
43 if (!sym || sym->type != SYM_ARRAY)
44 return;
45 if (get_param_num(arg) >= 0)
46 return;
47 name = expr_to_var(arg);
48 sm_error("doing dma on the stack (%s)", name);
49 free_string(name);
50 }
51
register_funcs_from_file(void)52 static void register_funcs_from_file(void)
53 {
54 struct token *token;
55 const char *func;
56 int arg;
57
58 token = get_tokens_file("kernel.dma_funcs");
59 if (!token)
60 return;
61 if (token_type(token) != TOKEN_STREAMBEGIN)
62 return;
63 token = token->next;
64 while (token_type(token) != TOKEN_STREAMEND) {
65 if (token_type(token) != TOKEN_IDENT)
66 return;
67 func = show_ident(token->ident);
68 token = token->next;
69 if (token_type(token) != TOKEN_NUMBER)
70 return;
71 arg = atoi(token->number);
72 add_function_hook(func, &match_dma_func, INT_PTR(arg));
73 token = token->next;
74 }
75 clear_token_alloc();
76 }
77
check_dma_on_stack(int id)78 void check_dma_on_stack(int id)
79 {
80 if (option_project != PROJ_KERNEL)
81 return;
82 my_id = id;
83 register_funcs_from_file();
84 }
85