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 * Copyright (c) 2012, Joyent, Inc. All rights reserved.
33 */
34
35 /*
36 * SPARC specific setup routine - relocate ld.so's symbols, setup its
37 * environment, map in loadable sections of the executable.
38 *
39 * Takes base address ld.so was loaded at, address of ld.so's dynamic
40 * structure, address of process environment pointers, address of auxiliary
41 * vector and * argv[0] (process name).
42 * If errors occur, send process signal - otherwise
43 * return executable's entry point to the bootstrap routine.
44 */
45
46 #include <signal.h>
47 #include <stdlib.h>
48 #include <sys/auxv.h>
49 #include <sys/types.h>
50 #include <sys/stat.h>
51 #include <link.h>
52 #include <dlfcn.h>
53 #include "_rtld.h"
54 #include "_audit.h"
55 #include "msg.h"
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;
67 uint_t hwcap[2] = { 0, 0 };
68 Dyn *dyn_ptr;
69 Phdr *phdr = NULL;
70 Rt_map *lmp;
71 auxv_t *auxv, *_auxv;
72 uid_t uid = (uid_t)-1, euid = (uid_t)-1;
73 gid_t gid = (gid_t)-1, egid = (gid_t)-1;
74 char *_platform = NULL, *_execname = NULL, *_emulator = NULL;
75 int auxflags = -1;
76
77 /*
78 * Scan the bootstrap structure to pick up the basics.
79 */
80 for (; ebp->eb_tag != EB_NULL; ebp++)
81 switch (ebp->eb_tag) {
82 case EB_DYNAMIC:
83 break;
84 case EB_LDSO_BASE:
85 ld_base = (unsigned long)ebp->eb_un.eb_val;
86 break;
87 case EB_ARGV:
88 _argv = (char **)ebp->eb_un.eb_ptr;
89 break;
90 case EB_ENVP:
91 _envp = (char **)ebp->eb_un.eb_ptr;
92 break;
93 case EB_AUXV:
94 _auxv = (auxv_t *)ebp->eb_un.eb_ptr;
95 break;
96 case EB_PAGESIZE:
97 _syspagsz = (int)ebp->eb_un.eb_val;
98 break;
99 }
100
101 /*
102 * Search the aux. vector for the information passed by exec.
103 */
104 for (auxv = _auxv; auxv->a_type != AT_NULL; auxv++) {
105 switch (auxv->a_type) {
106 case AT_EXECFD:
107 /* this is the old exec that passes a file descriptor */
108 fd = (int)auxv->a_un.a_val;
109 break;
110 case AT_FLAGS:
111 /* processor flags (MAU available, etc) */
112 _flags = auxv->a_un.a_val;
113 break;
114 case AT_PAGESZ:
115 /* system page size */
116 _syspagsz = (int)auxv->a_un.a_val;
117 break;
118 case AT_PHDR:
119 /* address of the segment table */
120 phdr = (Phdr *)auxv->a_un.a_ptr;
121 break;
122 case AT_BASE:
123 /* interpreter base address */
124 if (ld_base == 0)
125 ld_base = auxv->a_un.a_val;
126 interp_base = auxv->a_un.a_val;
127 break;
128 case AT_SUN_UID:
129 /* effective user id for the executable */
130 euid = (uid_t)auxv->a_un.a_val;
131 break;
132 case AT_SUN_RUID:
133 /* real user id for the executable */
134 uid = (uid_t)auxv->a_un.a_val;
135 break;
136 case AT_SUN_GID:
137 /* effective group id for the executable */
138 egid = (gid_t)auxv->a_un.a_val;
139 break;
140 case AT_SUN_RGID:
141 /* real group id for the executable */
142 gid = (gid_t)auxv->a_un.a_val;
143 break;
144 case AT_SUN_PLATFORM:
145 /* platform name */
146 _platform = auxv->a_un.a_ptr;
147 break;
148 case AT_SUN_EXECNAME:
149 /* full pathname of execed object */
150 _execname = auxv->a_un.a_ptr;
151 break;
152 case AT_SUN_AUXFLAGS:
153 /* auxiliary flags */
154 auxflags = (int)auxv->a_un.a_val;
155 break;
156 case AT_SUN_HWCAP:
157 /* hardware capabilities */
158 hwcap[0] = (uint_t)auxv->a_un.a_val;
159 break;
160 case AT_SUN_HWCAP2:
161 /* hardware capabilities */
162 hwcap[1] = (uint_t)auxv->a_un.a_val;
163 break;
164 case AT_SUN_EMULATOR:
165 /* name of emulation library, if any */
166 _emulator = auxv->a_un.a_ptr;
167 break;
168 }
169 }
170
171 /*
172 * Get needed info from ld.so's dynamic structure.
173 */
174 /* LINTED */
175 dyn_ptr = (Dyn *)((char *)ld_dyn + ld_base);
176 for (ld_dyn = dyn_ptr; ld_dyn->d_tag != DT_NULL; ld_dyn++) {
177 switch (ld_dyn->d_tag) {
178 case DT_RELA:
179 reladdr = ld_dyn->d_un.d_ptr + ld_base;
180 break;
181 case DT_RELACOUNT:
182 relacount = ld_dyn->d_un.d_val;
183 break;
184 case DT_RELAENT:
185 relaent = ld_dyn->d_un.d_val;
186 break;
187 case DT_STRTAB:
188 strtab = ld_dyn->d_un.d_ptr + ld_base;
189 break;
190 case DT_SONAME:
191 soname = ld_dyn->d_un.d_val;
192 break;
193 }
194 }
195 _rt_name = (char *)strtab + soname;
196
197 /*
198 * If we don't have a RELAENT, just assume the size.
199 */
200 if (relaent == 0)
201 relaent = sizeof (Rela);
202
203 /*
204 * As all global symbol references within ld.so.1 are protected
205 * (symbolic), only RELATIVE and JMPSLOT relocations should be left
206 * to process at runtime. Process all relative relocations now.
207 */
208 for (; relacount; relacount--) {
209 ulong_t roffset;
210
211 roffset = ((Rela *)reladdr)->r_offset + ld_base;
212 *((ulong_t *)roffset) = ld_base +
213 ((Rela *)reladdr)->r_addend;
214 reladdr += relaent;
215 }
216
217 /*
218 * If an emulation library is being used, use that as the linker's
219 * effective executable name. The real executable is not linked by this
220 * linker.
221 */
222 if (_emulator != NULL) {
223 _execname = _emulator;
224 rtld_flags2 |= RT_FL2_BRANDED;
225 }
226
227 /*
228 * Continue with generic startup processing.
229 */
230 /* BEGIN CSTYLED */
231 if ((lmp = setup((char **)_envp, (auxv_t *)_auxv, _flags, _platform,
232 _syspagsz, _rt_name, ld_base, interp_base, fd, phdr,
233 _execname, _argv, uid, euid, gid, egid,
234 /* CSTYLED */
235 NULL, auxflags, hwcap)) == NULL) {
236 rtldexit(&lml_main, 1);
237 }
238 /* END CSTYLED */
239
240 return (LM_ENTRY_PT(lmp)());
241 }
242