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 * SPARCV9-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_LDSO_BASE:
83 ld_base = (unsigned long)ebp->eb_un.eb_val;
84 break;
85 case EB_ARGV:
86 _argv = (char **)ebp->eb_un.eb_ptr;
87 break;
88 case EB_ENVP:
89 _envp = (char **)ebp->eb_un.eb_ptr;
90 break;
91 case EB_AUXV:
92 _auxv = (auxv_t *)ebp->eb_un.eb_ptr;
93 break;
94 case EB_PAGESIZE:
95 _syspagsz = (int)ebp->eb_un.eb_val;
96 break;
97 }
98
99 /*
100 * Search the aux. vector for the information passed by exec.
101 */
102 for (auxv = _auxv; auxv->a_type != AT_NULL; auxv++) {
103 switch (auxv->a_type) {
104 case AT_EXECFD:
105 /* this is the old exec that passes a file descriptor */
106 fd = (int)auxv->a_un.a_val;
107 break;
108 case AT_FLAGS:
109 /* processor flags (MAU available, etc) */
110 _flags = auxv->a_un.a_val;
111 break;
112 case AT_PAGESZ:
113 /* system page size */
114 _syspagsz = (int)auxv->a_un.a_val;
115 break;
116 case AT_PHDR:
117 /* address of the segment table */
118 phdr = (Phdr *)auxv->a_un.a_ptr;
119 break;
120 case AT_BASE:
121 /* interpreter base address */
122 if (ld_base == 0)
123 ld_base = auxv->a_un.a_val;
124 interp_base = auxv->a_un.a_val;
125 break;
126 case AT_SUN_UID:
127 /* effective user id for the executable */
128 euid = (uid_t)auxv->a_un.a_val;
129 break;
130 case AT_SUN_RUID:
131 /* real user id for the executable */
132 uid = (uid_t)auxv->a_un.a_val;
133 break;
134 case AT_SUN_GID:
135 /* effective group id for the executable */
136 egid = (gid_t)auxv->a_un.a_val;
137 break;
138 case AT_SUN_RGID:
139 /* real group id for the executable */
140 gid = (gid_t)auxv->a_un.a_val;
141 break;
142 case AT_SUN_PLATFORM:
143 /* platform name */
144 _platform = auxv->a_un.a_ptr;
145 break;
146 case AT_SUN_EXECNAME:
147 /* full pathname of execed object */
148 _execname = auxv->a_un.a_ptr;
149 break;
150 case AT_SUN_AUXFLAGS:
151 /* auxiliary flags */
152 auxflags = (int)auxv->a_un.a_val;
153 break;
154 case AT_SUN_HWCAP:
155 /* hardware capabilities */
156 hwcap[0] = (uint_t)auxv->a_un.a_val;
157 break;
158 case AT_SUN_HWCAP2:
159 /* hardware capabilities */
160 hwcap[1] = (uint_t)auxv->a_un.a_val;
161 break;
162 case AT_SUN_EMULATOR:
163 /* name of emulation library, if any */
164 _emulator = auxv->a_un.a_ptr;
165 break;
166 }
167 }
168
169 /*
170 * Get needed info from ld.so's dynamic structure.
171 */
172 /* LINTED */
173 dyn_ptr = (Dyn *)((char *)ld_dyn + ld_base);
174 for (ld_dyn = dyn_ptr; ld_dyn->d_tag != DT_NULL; ld_dyn++) {
175 switch (ld_dyn->d_tag) {
176 case DT_RELA:
177 reladdr = ld_dyn->d_un.d_ptr + ld_base;
178 break;
179 case DT_RELACOUNT:
180 relacount = ld_dyn->d_un.d_val;
181 break;
182 case DT_RELAENT:
183 relaent = ld_dyn->d_un.d_val;
184 break;
185 case DT_STRTAB:
186 strtab = ld_dyn->d_un.d_ptr + ld_base;
187 break;
188 case DT_SONAME:
189 soname = ld_dyn->d_un.d_val;
190 break;
191 }
192 }
193 _rt_name = (char *)strtab + soname;
194
195 /*
196 * If we don't have a RELAENT, just assume the size.
197 */
198 if (relaent == 0)
199 relaent = sizeof (Rela);
200
201 /*
202 * As all global symbol references within ld.so.1 are protected
203 * (symbolic), only RELATIVE and JMPSLOT relocations should be left
204 * to process at runtime. Process all relative relocations now.
205 */
206 for (; relacount; relacount--) {
207 ulong_t roffset;
208
209 roffset = ((Rela *)reladdr)->r_offset + ld_base;
210 *((ulong_t *)roffset) = ld_base +
211 ((Rela *)reladdr)->r_addend;
212 reladdr += relaent;
213 }
214
215 /*
216 * If an emulation library is being used, use that as the linker's
217 * effective executable name. The real executable is not linked by this
218 * linker.
219 */
220 if (_emulator != NULL) {
221 _execname = _emulator;
222 rtld_flags2 |= RT_FL2_BRANDED;
223 }
224
225 /*
226 * Continue with generic startup processing.
227 */
228 if ((lmp = setup((char **)_envp, (auxv_t *)_auxv, _flags, _platform,
229 _syspagsz, _rt_name, ld_base, interp_base, fd, phdr,
230 _execname, _argv, uid, euid, gid, egid, NULL, auxflags,
231 hwcap)) == NULL) {
232 rtldexit(&lml_main, 1);
233 }
234
235 return (LM_ENTRY_PT(lmp)());
236 }
237