Line data Source code
1 : /* Return block represented by attribute.
2 : Copyright (C) 2004-2010, 2014, 2018 Red Hat, Inc.
3 : This file is part of elfutils.
4 : Written by Ulrich Drepper <drepper@redhat.com>, 2004.
5 :
6 : This file is free software; you can redistribute it and/or modify
7 : it under the terms of either
8 :
9 : * the GNU Lesser General Public License as published by the Free
10 : Software Foundation; either version 3 of the License, or (at
11 : your option) any later version
12 :
13 : or
14 :
15 : * the GNU General Public License as published by the Free
16 : Software Foundation; either version 2 of the License, or (at
17 : your option) any later version
18 :
19 : or both in parallel, as here.
20 :
21 : elfutils is distributed in the hope that it will be useful, but
22 : WITHOUT ANY WARRANTY; without even the implied warranty of
23 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24 : General Public License for more details.
25 :
26 : You should have received copies of the GNU General Public License and
27 : the GNU Lesser General Public License along with this program. If
28 : not, see <http://www.gnu.org/licenses/>. */
29 :
30 : #ifdef HAVE_CONFIG_H
31 : # include <config.h>
32 : #endif
33 :
34 : #include <dwarf.h>
35 : #include "libdwP.h"
36 :
37 :
38 : int
39 815505 : dwarf_formblock (Dwarf_Attribute *attr, Dwarf_Block *return_block)
40 : {
41 815505 : if (attr == NULL)
42 : return -1;
43 :
44 815505 : const unsigned char *datap = attr->valp;
45 815505 : const unsigned char *endp = attr->cu->endp;
46 :
47 815505 : switch (attr->form)
48 : {
49 85 : case DW_FORM_block1:
50 85 : if (unlikely (endp - datap < 1))
51 : goto invalid;
52 85 : return_block->length = *(uint8_t *) attr->valp;
53 85 : return_block->data = attr->valp + 1;
54 85 : break;
55 :
56 0 : case DW_FORM_block2:
57 0 : if (unlikely (endp - datap < 2))
58 : goto invalid;
59 0 : return_block->length = read_2ubyte_unaligned (attr->cu->dbg, attr->valp);
60 0 : return_block->data = attr->valp + 2;
61 0 : break;
62 :
63 0 : case DW_FORM_block4:
64 0 : if (unlikely (endp - datap < 4))
65 : goto invalid;
66 0 : return_block->length = read_4ubyte_unaligned (attr->cu->dbg, attr->valp);
67 0 : return_block->data = attr->valp + 4;
68 0 : break;
69 :
70 218512 : case DW_FORM_block:
71 : case DW_FORM_exprloc:
72 218512 : if (unlikely (endp - datap < 1))
73 : goto invalid;
74 218512 : get_uleb128 (return_block->length, datap, endp);
75 218512 : return_block->data = (unsigned char *) datap;
76 218512 : break;
77 :
78 0 : case DW_FORM_data16:
79 : /* The DWARFv5 spec calls this constant class, but we interpret
80 : it as a block that the user will need to interpret when
81 : converting to a value. */
82 0 : if (unlikely (endp - datap < 16))
83 : goto invalid;
84 0 : return_block->length = 16;
85 0 : return_block->data = (unsigned char *) datap;
86 0 : break;
87 :
88 596908 : default:
89 596908 : __libdw_seterrno (DWARF_E_NO_BLOCK);
90 596908 : return -1;
91 : }
92 :
93 218597 : if (unlikely (return_block->length > (size_t) (endp - return_block->data)))
94 : {
95 : /* Block does not fit. */
96 0 : invalid:
97 0 : __libdw_seterrno (DWARF_E_INVALID_DWARF);
98 0 : return -1;
99 : }
100 :
101 : return 0;
102 : }
103 : INTDEF(dwarf_formblock)
|