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 2009 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /*
28 * Copyright (c) 1988 AT&T
29 * All Rights Reserved
30 */
31
32 /*
33 * SPARC specific setup routine - relocate ld.so's symbols, setup its
34 * environment, map in loadable sections of the executable.
35 *
36 * Takes base address ld.so was loaded at, address of ld.so's dynamic
37 * structure, address of process environment pointers, address of auxiliary
38 * vector and * argv[0] (process name).
39 * If errors occur, send process signal - otherwise
40 * return executable's entry point to the bootstrap routine.
41 */
42
43 #include <signal.h>
44 #include <stdlib.h>
45 #include <sys/auxv.h>
46 #include <sys/types.h>
47 #include <sys/stat.h>
48 #include <link.h>
49 #include <dlfcn.h>
50 #include "_rtld.h"
51 #include "_audit.h"
52 #include "msg.h"
53 #ifdef A_OUT
54 #include "_a.out.h"
55 #endif /* A_OUT */
56
57 /* VARARGS */
58 unsigned long
_setup(Boot * ebp,Dyn * ld_dyn)59 _setup(Boot *ebp, Dyn *ld_dyn)
60 {
61 ulong_t reladdr, relacount, ld_base = 0;
62 ulong_t relaent = 0;
63 ulong_t strtab, soname, interp_base = 0;
64 char *_rt_name, **_envp, **_argv;
65 int _syspagsz = 0, fd = -1;
66 uint_t _flags = 0, hwcap_1 = 0;
67 Dyn *dyn_ptr;
68 Phdr *phdr = NULL;
69 Rt_map *lmp;
70 auxv_t *auxv, *_auxv;
71 uid_t uid = (uid_t)-1, euid = (uid_t)-1;
72 gid_t gid = (gid_t)-1, egid = (gid_t)-1;
73 char *_platform = NULL, *_execname = NULL, *_emulator = NULL;
74 int auxflags = -1;
75 #ifdef A_OUT
76 void *aoutdyn = NULL;
77 #endif /* A_OUT */
78
79 /*
80 * Scan the bootstrap structure to pick up the basics.
81 */
82 for (; ebp->eb_tag != EB_NULL; ebp++)
83 switch (ebp->eb_tag) {
84 case EB_DYNAMIC:
85 #ifdef A_OUT
86 aoutdyn = (Link_dynamic *)ebp->eb_un.eb_val;
87 #endif /* A_OUT */
88 break;
89 case EB_LDSO_BASE:
90 ld_base = (unsigned long)ebp->eb_un.eb_val;
91 break;
92 case EB_ARGV:
93 _argv = (char **)ebp->eb_un.eb_ptr;
94 break;
95 case EB_ENVP:
96 _envp = (char **)ebp->eb_un.eb_ptr;
97 break;
98 case EB_AUXV:
99 _auxv = (auxv_t *)ebp->eb_un.eb_ptr;
100 break;
101 case EB_PAGESIZE:
102 _syspagsz = (int)ebp->eb_un.eb_val;
103 break;
104 }
105
106 /*
107 * Search the aux. vector for the information passed by exec.
108 */
109 for (auxv = _auxv; auxv->a_type != AT_NULL; auxv++) {
110 switch (auxv->a_type) {
111 case AT_EXECFD:
112 /* this is the old exec that passes a file descriptor */
113 fd = (int)auxv->a_un.a_val;
114 break;
115 case AT_FLAGS:
116 /* processor flags (MAU available, etc) */
117 _flags = auxv->a_un.a_val;
118 break;
119 case AT_PAGESZ:
120 /* system page size */
121 _syspagsz = (int)auxv->a_un.a_val;
122 break;
123 case AT_PHDR:
124 /* address of the segment table */
125 phdr = (Phdr *)auxv->a_un.a_ptr;
126 break;
127 case AT_BASE:
128 /* interpreter base address */
129 if (ld_base == 0)
130 ld_base = auxv->a_un.a_val;
131 interp_base = auxv->a_un.a_val;
132 break;
133 case AT_SUN_UID:
134 /* effective user id for the executable */
135 euid = (uid_t)auxv->a_un.a_val;
136 break;
137 case AT_SUN_RUID:
138 /* real user id for the executable */
139 uid = (uid_t)auxv->a_un.a_val;
140 break;
141 case AT_SUN_GID:
142 /* effective group id for the executable */
143 egid = (gid_t)auxv->a_un.a_val;
144 break;
145 case AT_SUN_RGID:
146 /* real group id for the executable */
147 gid = (gid_t)auxv->a_un.a_val;
148 break;
149 case AT_SUN_PLATFORM:
150 /* platform name */
151 _platform = auxv->a_un.a_ptr;
152 break;
153 case AT_SUN_EXECNAME:
154 /* full pathname of execed object */
155 _execname = auxv->a_un.a_ptr;
156 break;
157 case AT_SUN_AUXFLAGS:
158 /* auxiliary flags */
159 auxflags = (int)auxv->a_un.a_val;
160 break;
161 case AT_SUN_HWCAP:
162 /* hardware capabilities */
163 hwcap_1 = (uint_t)auxv->a_un.a_val;
164 break;
165 case AT_SUN_EMULATOR:
166 /* name of emulation library, if any */
167 _emulator = auxv->a_un.a_ptr;
168 break;
169 }
170 }
171
172 /*
173 * Get needed info from ld.so's dynamic structure.
174 */
175 /* LINTED */
176 dyn_ptr = (Dyn *)((char *)ld_dyn + ld_base);
177 for (ld_dyn = dyn_ptr; ld_dyn->d_tag != DT_NULL; ld_dyn++) {
178 switch (ld_dyn->d_tag) {
179 case DT_RELA:
180 reladdr = ld_dyn->d_un.d_ptr + ld_base;
181 break;
182 case DT_RELACOUNT:
183 relacount = ld_dyn->d_un.d_val;
184 break;
185 case DT_RELAENT:
186 relaent = ld_dyn->d_un.d_val;
187 break;
188 case DT_STRTAB:
189 strtab = ld_dyn->d_un.d_ptr + ld_base;
190 break;
191 case DT_SONAME:
192 soname = ld_dyn->d_un.d_val;
193 break;
194 }
195 }
196 _rt_name = (char *)strtab + soname;
197
198 /*
199 * If we don't have a RELAENT, just assume the size.
200 */
201 if (relaent == 0)
202 relaent = sizeof (Rela);
203
204 /*
205 * As all global symbol references within ld.so.1 are protected
206 * (symbolic), only RELATIVE and JMPSLOT relocations should be left
207 * to process at runtime. Process all relative relocations now.
208 */
209 for (; relacount; relacount--) {
210 ulong_t roffset;
211
212 roffset = ((Rela *)reladdr)->r_offset + ld_base;
213 *((ulong_t *)roffset) = ld_base +
214 ((Rela *)reladdr)->r_addend;
215 reladdr += relaent;
216 }
217
218 /*
219 * If an emulation library is being used, use that as the linker's
220 * effective executable name. The real executable is not linked by this
221 * linker.
222 */
223 if (_emulator != NULL) {
224 _execname = _emulator;
225 rtld_flags2 |= RT_FL2_BRANDED;
226 }
227
228 /*
229 * Continue with generic startup processing.
230 */
231 /* BEGIN CSTYLED */
232 if ((lmp = setup((char **)_envp, (auxv_t *)_auxv, _flags, _platform,
233 _syspagsz, _rt_name, ld_base, interp_base, fd, phdr,
234 _execname, _argv, uid, euid, gid, egid,
235 #ifdef A_OUT
236 aoutdyn, auxflags, hwcap_1)) == NULL) {
237 #else
238 /* CSTYLED */
239 NULL, auxflags, hwcap_1)) == NULL) {
240 #endif /* A_OUT */
241 rtldexit(&lml_main, 1);
242 }
243 /* END CSTYLED */
244
245 return (LM_ENTRY_PT(lmp)());
246 }
247