1*1f5207b7SJohn Levon /*
2*1f5207b7SJohn Levon * Copyright (C) 2009 Dan Carpenter.
3*1f5207b7SJohn Levon *
4*1f5207b7SJohn Levon * This program is free software; you can redistribute it and/or
5*1f5207b7SJohn Levon * modify it under the terms of the GNU General Public License
6*1f5207b7SJohn Levon * as published by the Free Software Foundation; either version 2
7*1f5207b7SJohn Levon * of the License, or (at your option) any later version.
8*1f5207b7SJohn Levon *
9*1f5207b7SJohn Levon * This program is distributed in the hope that it will be useful,
10*1f5207b7SJohn Levon * but WITHOUT ANY WARRANTY; without even the implied warranty of
11*1f5207b7SJohn Levon * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12*1f5207b7SJohn Levon * GNU General Public License for more details.
13*1f5207b7SJohn Levon *
14*1f5207b7SJohn Levon * You should have received a copy of the GNU General Public License
15*1f5207b7SJohn Levon * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
16*1f5207b7SJohn Levon */
17*1f5207b7SJohn Levon
18*1f5207b7SJohn Levon #include "smatch.h"
19*1f5207b7SJohn Levon
20*1f5207b7SJohn Levon static int my_id;
21*1f5207b7SJohn Levon
match_dma_func(const char * fn,struct expression * expr,void * param)22*1f5207b7SJohn Levon static void match_dma_func(const char *fn, struct expression *expr, void *param)
23*1f5207b7SJohn Levon {
24*1f5207b7SJohn Levon struct expression *arg;
25*1f5207b7SJohn Levon struct symbol *sym;
26*1f5207b7SJohn Levon char *name;
27*1f5207b7SJohn Levon
28*1f5207b7SJohn Levon arg = get_argument_from_call_expr(expr->args, PTR_INT(param));
29*1f5207b7SJohn Levon arg = strip_expr(arg);
30*1f5207b7SJohn Levon if (!arg)
31*1f5207b7SJohn Levon return;
32*1f5207b7SJohn Levon if (arg->type == EXPR_PREOP && arg->op == '&') {
33*1f5207b7SJohn Levon if (arg->unop->type != EXPR_SYMBOL)
34*1f5207b7SJohn Levon return;
35*1f5207b7SJohn Levon name = expr_to_str(arg);
36*1f5207b7SJohn Levon sm_error("doing dma on the stack (%s)", name);
37*1f5207b7SJohn Levon free_string(name);
38*1f5207b7SJohn Levon return;
39*1f5207b7SJohn Levon }
40*1f5207b7SJohn Levon if (arg->type != EXPR_SYMBOL)
41*1f5207b7SJohn Levon return;
42*1f5207b7SJohn Levon sym = get_type(arg);
43*1f5207b7SJohn Levon if (!sym || sym->type != SYM_ARRAY)
44*1f5207b7SJohn Levon return;
45*1f5207b7SJohn Levon if (get_param_num(arg) >= 0)
46*1f5207b7SJohn Levon return;
47*1f5207b7SJohn Levon name = expr_to_var(arg);
48*1f5207b7SJohn Levon sm_error("doing dma on the stack (%s)", name);
49*1f5207b7SJohn Levon free_string(name);
50*1f5207b7SJohn Levon }
51*1f5207b7SJohn Levon
register_funcs_from_file(void)52*1f5207b7SJohn Levon static void register_funcs_from_file(void)
53*1f5207b7SJohn Levon {
54*1f5207b7SJohn Levon struct token *token;
55*1f5207b7SJohn Levon const char *func;
56*1f5207b7SJohn Levon int arg;
57*1f5207b7SJohn Levon
58*1f5207b7SJohn Levon token = get_tokens_file("kernel.dma_funcs");
59*1f5207b7SJohn Levon if (!token)
60*1f5207b7SJohn Levon return;
61*1f5207b7SJohn Levon if (token_type(token) != TOKEN_STREAMBEGIN)
62*1f5207b7SJohn Levon return;
63*1f5207b7SJohn Levon token = token->next;
64*1f5207b7SJohn Levon while (token_type(token) != TOKEN_STREAMEND) {
65*1f5207b7SJohn Levon if (token_type(token) != TOKEN_IDENT)
66*1f5207b7SJohn Levon return;
67*1f5207b7SJohn Levon func = show_ident(token->ident);
68*1f5207b7SJohn Levon token = token->next;
69*1f5207b7SJohn Levon if (token_type(token) != TOKEN_NUMBER)
70*1f5207b7SJohn Levon return;
71*1f5207b7SJohn Levon arg = atoi(token->number);
72*1f5207b7SJohn Levon add_function_hook(func, &match_dma_func, INT_PTR(arg));
73*1f5207b7SJohn Levon token = token->next;
74*1f5207b7SJohn Levon }
75*1f5207b7SJohn Levon clear_token_alloc();
76*1f5207b7SJohn Levon }
77*1f5207b7SJohn Levon
check_dma_on_stack(int id)78*1f5207b7SJohn Levon void check_dma_on_stack(int id)
79*1f5207b7SJohn Levon {
80*1f5207b7SJohn Levon if (option_project != PROJ_KERNEL)
81*1f5207b7SJohn Levon return;
82*1f5207b7SJohn Levon my_id = id;
83*1f5207b7SJohn Levon register_funcs_from_file();
84*1f5207b7SJohn Levon }
85