Branch data 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 : 816251 : dwarf_formblock (Dwarf_Attribute *attr, Dwarf_Block *return_block)
40 : : {
41 [ + - ]: 816251 : if (attr == NULL)
42 : : return -1;
43 : :
44 : 816251 : const unsigned char *datap = attr->valp;
45 : 816251 : const unsigned char *endp = attr->cu->endp;
46 : :
47 [ + - - + : 816251 : 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 : 219187 : case DW_FORM_block:
71 : : case DW_FORM_exprloc:
72 [ + - ]: 219187 : if (unlikely (endp - datap < 1))
73 : : goto invalid;
74 : 219187 : get_uleb128 (return_block->length, datap, endp);
75 : 219187 : return_block->data = (unsigned char *) datap;
76 : 219187 : 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 : 596979 : default:
89 : 596979 : __libdw_seterrno (DWARF_E_NO_BLOCK);
90 : 596979 : return -1;
91 : : }
92 : :
93 [ - + ]: 219272 : 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)
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