source: mainline/uspace/lib/c/generic/rtld/dynamic.c@ b1834a01

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since b1834a01 was b1834a01, checked in by Jakub Jermar <jakub@…>, 7 years ago

Categorize the remaining orphan doxygroups
  • Property mode set to 100644
File size: 4.6 KB
Line 
1/*
2 * Copyright (c) 2008 Jiri Svoboda
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup rtld
30 * @brief
31 * @{
32 */
33/**
34 * @file
35 */
36
37#include <stdio.h>
38#include <inttypes.h>
39#include <str.h>
40
41#include <rtld/elf_dyn.h>
42#include <rtld/dynamic.h>
43#include <rtld/rtld.h>
44#include <rtld/rtld_debug.h>
45
46void dynamic_parse(elf_dyn_t *dyn_ptr, size_t bias, dyn_info_t *info)
47{
48 elf_dyn_t *dp = dyn_ptr;
49
50 void *d_ptr;
51 elf_word d_val;
52
53 elf_word soname_idx;
54 elf_word rpath_idx;
55
56 DPRINTF("memset\n");
57 memset(info, 0, sizeof(dyn_info_t));
58
59 soname_idx = 0;
60 rpath_idx = 0;
61
62 DPRINTF("pass 1\n");
63 while (dp->d_tag != DT_NULL) {
64 d_ptr = (void *)((uint8_t *)dp->d_un.d_ptr + bias);
65 d_val = dp->d_un.d_val;
66 DPRINTF("tag=%u ptr=0x%x val=%u\n", (unsigned)dp->d_tag,
67 (unsigned)d_ptr, (unsigned)d_val);
68
69 switch (dp->d_tag) {
70
71 case DT_PLTRELSZ:
72 info->plt_rel_sz = d_val;
73 break;
74 case DT_PLTGOT:
75 info->plt_got = d_ptr;
76 break;
77 case DT_HASH:
78 info->hash = d_ptr;
79 break;
80 case DT_STRTAB:
81 info->str_tab = d_ptr;
82 break;
83 case DT_SYMTAB:
84 info->sym_tab = d_ptr;
85 break;
86 case DT_RELA:
87 info->rela = d_ptr;
88 break;
89 case DT_RELASZ:
90 info->rela_sz = d_val;
91 break;
92 case DT_RELAENT:
93 info->rela_ent = d_val;
94 break;
95 case DT_STRSZ:
96 info->str_sz = d_val;
97 break;
98 case DT_SYMENT:
99 info->sym_ent = d_val;
100 break;
101 case DT_INIT:
102 info->init = d_ptr;
103 break;
104 case DT_FINI:
105 info->fini = d_ptr;
106 break;
107 case DT_SONAME:
108 soname_idx = d_val;
109 break;
110 case DT_RPATH:
111 rpath_idx = d_val;
112 break;
113 case DT_SYMBOLIC:
114 info->symbolic = true;
115 break;
116 case DT_REL:
117 info->rel = d_ptr;
118 break;
119 case DT_RELSZ:
120 info->rel_sz = d_val;
121 break;
122 case DT_RELENT:
123 info->rel_ent = d_val;
124 break;
125 case DT_PLTREL:
126 info->plt_rel = d_val;
127 break;
128 case DT_TEXTREL:
129 info->text_rel = true;
130 break;
131 case DT_JMPREL:
132 info->jmp_rel = d_ptr;
133 break;
134 case DT_BIND_NOW:
135 info->bind_now = true;
136 break;
137
138 default:
139 if (dp->d_tag >= DT_LOPROC && dp->d_tag <= DT_HIPROC)
140 dyn_parse_arch(dp, bias, info);
141 break;
142 }
143
144 ++dp;
145 }
146
147 info->soname = info->str_tab + soname_idx;
148 info->rpath = info->str_tab + rpath_idx;
149
150 /* This will be useful for parsing dependencies later */
151 info->dynamic = dyn_ptr;
152
153 DPRINTF("str_tab=0x%" PRIxPTR ", soname_idx=0x%x, soname=0x%" PRIxPTR "\n",
154 (uintptr_t)info->soname, soname_idx, (uintptr_t)info->soname);
155 DPRINTF("soname='%s'\n", info->soname);
156 DPRINTF("rpath='%s'\n", info->rpath);
157 DPRINTF("hash=0x%" PRIxPTR "\n", (uintptr_t)info->hash);
158 DPRINTF("dt_rela=0x%" PRIxPTR "\n", (uintptr_t)info->rela);
159 DPRINTF("dt_rela_sz=0x%" PRIxPTR "\n", (uintptr_t)info->rela_sz);
160 DPRINTF("dt_rel=0x%" PRIxPTR "\n", (uintptr_t)info->rel);
161 DPRINTF("dt_rel_sz=0x%" PRIxPTR "\n", (uintptr_t)info->rel_sz);
162
163 /*
164 * Now that we have a pointer to the string table,
165 * we can parse DT_NEEDED fields (which contain offsets into it).
166 */
167
168 DPRINTF("pass 2\n");
169 dp = dyn_ptr;
170 while (dp->d_tag != DT_NULL) {
171 d_val = dp->d_un.d_val;
172
173 switch (dp->d_tag) {
174 case DT_NEEDED:
175 /* Assume just for now there's only one dependency */
176 info->needed = info->str_tab + d_val;
177 DPRINTF("needed:'%s'\n", info->needed);
178 break;
179
180 default:
181 break;
182 }
183
184 ++dp;
185 }
186}
187
188/** @}
189 */
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