1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 *
26 * Update the symbol table entries:
27 *
28 * o If addr is non-zero then every symbol entry is updated to indicate the
29 * new location to which the object will be mapped.
30 *
31 * o The address of the `_edata' and `_end' symbols, and their associated
32 * section, is updated to reflect any new heap addition.
33 */
34
35 #include <libelf.h>
36 #include <string.h>
37 #include "sgs.h"
38 #include "machdep.h"
39 #include "msg.h"
40 #include "_librtld.h"
41
42 void
update_sym(Cache * cache,Cache * _cache,Addr edata,Half endx,Addr addr)43 update_sym(Cache *cache, Cache *_cache, Addr edata, Half endx, Addr addr)
44 {
45 char *strs;
46 Sym *syms;
47 Shdr *shdr;
48 Xword symn, cnt;
49
50 /*
51 * Set up to read the symbol table and its associated string table.
52 */
53 shdr = _cache->c_shdr;
54 syms = (Sym *)_cache->c_data->d_buf;
55 symn = shdr->sh_size / shdr->sh_entsize;
56
57 strs = (char *)cache[shdr->sh_link].c_data->d_buf;
58
59 /*
60 * Loop through the symbol table looking for `_end' and `_edata'.
61 */
62 for (cnt = 0; cnt < symn; cnt++, syms++) {
63 char *name = strs + syms->st_name;
64
65 if (addr) {
66 if (syms->st_value)
67 syms->st_value += addr;
68 }
69
70 if ((name[0] != '_') || (name[1] != 'e'))
71 continue;
72 if (strcmp(name, MSG_ORIG(MSG_SYM_END)) &&
73 strcmp(name, MSG_ORIG(MSG_SYM_EDATA)))
74 continue;
75
76 syms->st_value = edata + addr;
77 if (endx)
78 syms->st_shndx = endx;
79 }
80 }
81
82 int
syminfo(Cache * _cache,Alist ** nodirect)83 syminfo(Cache *_cache, Alist **nodirect)
84 {
85 Syminfo *info;
86 Shdr *shdr;
87 Word num, ndx;
88
89 shdr = _cache->c_shdr;
90 info = (Syminfo *)_cache->c_data->d_buf;
91 num = (Word)(shdr->sh_size / shdr->sh_entsize);
92
93 /*
94 * Traverse the syminfo section recording the index of all nodirect
95 * symbols.
96 */
97 for (ndx = 1, info++; ndx < num; ndx++, info++) {
98 if ((info->si_flags & SYMINFO_FLG_NOEXTDIRECT) == 0)
99 continue;
100
101 if (alist_append(nodirect, &ndx, sizeof (Word), 20) == 0)
102 return (1);
103 }
104 return (0);
105 }
106