Branch data Line data Source code
1 : : /* Add signed little endian base 128 integer to a section.
2 : : Copyright (C) 2002, 2005 Red Hat, Inc.
3 : : This file is part of elfutils.
4 : : Written by Ulrich Drepper <drepper@redhat.com>, 2002.
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 <inttypes.h>
35 : : #include <string.h>
36 : :
37 : : #include <libasmP.h>
38 : :
39 : :
40 : : int
41 : 16 : asm_addsleb128 (AsmScn_t *asmscn, int32_t num)
42 : : {
43 [ + - ]: 16 : if (asmscn == NULL)
44 : : return -1;
45 : :
46 [ - + # # ]: 16 : if (asmscn->type == SHT_NOBITS && unlikely (num != 0))
47 : : {
48 : 0 : __libasm_seterrno (ASM_E_TYPE);
49 : 0 : return -1;
50 : : }
51 : :
52 [ - + ]: 16 : if (unlikely (asmscn->ctx->textp))
53 : 0 : fprintf (asmscn->ctx->out.file, "\t.sleb128\t%" PRId32 "\n", num);
54 : : else
55 : : {
56 : 16 : char tmpbuf[(sizeof (num) * 8 + 6) / 7];
57 : 16 : char *dest = tmpbuf;
58 : 16 : uint32_t byte;
59 : 16 : int32_t endval = num >> 31;
60 : :
61 [ + + ]: 16 : if (num == 0)
62 : : byte = 0;
63 : : else
64 : 38 : while (1)
65 : : {
66 : 62 : byte = num & 0x7f;
67 : :
68 : 38 : num >>= 7;
69 [ + + ]: 38 : if (num == endval)
70 : : /* This is the last byte. */
71 : : break;
72 : :
73 : 24 : *dest++ = byte | 0x80;
74 : : }
75 : :
76 : 16 : *dest++ = byte;
77 : :
78 : : /* Number of bytes produced. */
79 : 16 : size_t nbytes = dest - tmpbuf;
80 : :
81 : : /* Make sure we have enough room. */
82 [ - + ]: 16 : if (__libasm_ensure_section_space (asmscn, nbytes) != 0)
83 : 0 : return -1;
84 : :
85 : : /* Copy the bytes. */
86 [ + - ]: 16 : if (likely (asmscn->type != SHT_NOBITS))
87 : 16 : memcpy (&asmscn->content->data[asmscn->content->len], tmpbuf, nbytes);
88 : :
89 : : /* Adjust the pointer in the data buffer. */
90 : 16 : asmscn->content->len += nbytes;
91 : :
92 : : /* Increment the offset in the (sub)section. */
93 : 16 : asmscn->offset += nbytes;
94 : : }
95 : :
96 : : return 0;
97 : : }
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