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#ifdef A_OUT
57#include	"_a.out.h"
58#endif /* A_OUT */
59
60/* VARARGS */
61unsigned long
62_setup(Boot *ebp, Dyn *ld_dyn)
63{
64	ulong_t		reladdr, relacount, ld_base = 0;
65	ulong_t		relaent = 0;
66	ulong_t		strtab, soname, interp_base = 0;
67	char		*_rt_name, **_envp, **_argv;
68	int		_syspagsz = 0, fd = -1;
69	uint_t		_flags = 0;
70	uint_t		hwcap[2] = { 0, 0 };
71	Dyn		*dyn_ptr;
72	Phdr		*phdr = NULL;
73	Rt_map		*lmp;
74	auxv_t		*auxv, *_auxv;
75	uid_t		uid = (uid_t)-1, euid = (uid_t)-1;
76	gid_t		gid = (gid_t)-1, egid = (gid_t)-1;
77	char		*_platform = NULL, *_execname = NULL, *_emulator = NULL;
78	int		auxflags = -1;
79#ifdef	A_OUT
80	void		*aoutdyn = NULL;
81#endif	/* A_OUT */
82
83	/*
84	 * Scan the bootstrap structure to pick up the basics.
85	 */
86	for (; ebp->eb_tag != EB_NULL; ebp++)
87		switch (ebp->eb_tag) {
88		case EB_DYNAMIC:
89#ifdef A_OUT
90			aoutdyn = (Link_dynamic *)ebp->eb_un.eb_val;
91#endif /* A_OUT */
92			break;
93		case EB_LDSO_BASE:
94			ld_base = (unsigned long)ebp->eb_un.eb_val;
95			break;
96		case EB_ARGV:
97			_argv = (char **)ebp->eb_un.eb_ptr;
98			break;
99		case EB_ENVP:
100			_envp = (char **)ebp->eb_un.eb_ptr;
101			break;
102		case EB_AUXV:
103			_auxv = (auxv_t *)ebp->eb_un.eb_ptr;
104			break;
105		case EB_PAGESIZE:
106			_syspagsz = (int)ebp->eb_un.eb_val;
107			break;
108		}
109
110	/*
111	 * Search the aux. vector for the information passed by exec.
112	 */
113	for (auxv = _auxv; auxv->a_type != AT_NULL; auxv++) {
114		switch (auxv->a_type) {
115		case AT_EXECFD:
116			/* this is the old exec that passes a file descriptor */
117			fd = (int)auxv->a_un.a_val;
118			break;
119		case AT_FLAGS:
120			/* processor flags (MAU available, etc) */
121			_flags = auxv->a_un.a_val;
122			break;
123		case AT_PAGESZ:
124			/* system page size */
125			_syspagsz = (int)auxv->a_un.a_val;
126			break;
127		case AT_PHDR:
128			/* address of the segment table */
129			phdr = (Phdr *)auxv->a_un.a_ptr;
130			break;
131		case AT_BASE:
132			/* interpreter base address */
133			if (ld_base == 0)
134				ld_base = auxv->a_un.a_val;
135			interp_base = auxv->a_un.a_val;
136			break;
137		case AT_SUN_UID:
138			/* effective user id for the executable */
139			euid = (uid_t)auxv->a_un.a_val;
140			break;
141		case AT_SUN_RUID:
142			/* real user id for the executable */
143			uid = (uid_t)auxv->a_un.a_val;
144			break;
145		case AT_SUN_GID:
146			/* effective group id for the executable */
147			egid = (gid_t)auxv->a_un.a_val;
148			break;
149		case AT_SUN_RGID:
150			/* real group id for the executable */
151			gid = (gid_t)auxv->a_un.a_val;
152			break;
153		case AT_SUN_PLATFORM:
154			/* platform name */
155			_platform = auxv->a_un.a_ptr;
156			break;
157		case AT_SUN_EXECNAME:
158			/* full pathname of execed object */
159			_execname = auxv->a_un.a_ptr;
160			break;
161		case AT_SUN_AUXFLAGS:
162			/* auxiliary flags */
163			auxflags = (int)auxv->a_un.a_val;
164			break;
165		case AT_SUN_HWCAP:
166			/* hardware capabilities */
167			hwcap[0] = (uint_t)auxv->a_un.a_val;
168			break;
169		case AT_SUN_HWCAP2:
170			/* hardware capabilities */
171			hwcap[1] = (uint_t)auxv->a_un.a_val;
172			break;
173		case AT_SUN_EMULATOR:
174			/* name of emulation library, if any */
175			_emulator = auxv->a_un.a_ptr;
176			break;
177		}
178	}
179
180	/*
181	 * Get needed info from ld.so's dynamic structure.
182	 */
183	/* LINTED */
184	dyn_ptr = (Dyn *)((char *)ld_dyn + ld_base);
185	for (ld_dyn = dyn_ptr; ld_dyn->d_tag != DT_NULL; ld_dyn++) {
186		switch (ld_dyn->d_tag) {
187		case DT_RELA:
188			reladdr = ld_dyn->d_un.d_ptr + ld_base;
189			break;
190		case DT_RELACOUNT:
191			relacount = ld_dyn->d_un.d_val;
192			break;
193		case DT_RELAENT:
194			relaent = ld_dyn->d_un.d_val;
195			break;
196		case DT_STRTAB:
197			strtab = ld_dyn->d_un.d_ptr + ld_base;
198			break;
199		case DT_SONAME:
200			soname = ld_dyn->d_un.d_val;
201			break;
202		}
203	}
204	_rt_name = (char *)strtab + soname;
205
206	/*
207	 * If we don't have a RELAENT, just assume the size.
208	 */
209	if (relaent == 0)
210		relaent = sizeof (Rela);
211
212	/*
213	 * As all global symbol references within ld.so.1 are protected
214	 * (symbolic), only RELATIVE and JMPSLOT relocations should be left
215	 * to process at runtime.  Process all relative relocations now.
216	 */
217	for (; relacount; relacount--) {
218		ulong_t	roffset;
219
220		roffset = ((Rela *)reladdr)->r_offset + ld_base;
221		*((ulong_t *)roffset) = ld_base +
222		    ((Rela *)reladdr)->r_addend;
223		reladdr += relaent;
224	}
225
226	/*
227	 * If an emulation library is being used, use that as the linker's
228	 * effective executable name. The real executable is not linked by this
229	 * linker.
230	 */
231	if (_emulator != NULL) {
232		_execname = _emulator;
233		rtld_flags2 |= RT_FL2_BRANDED;
234	}
235
236	/*
237	 * Continue with generic startup processing.
238	 */
239	/* BEGIN CSTYLED */
240	if ((lmp = setup((char **)_envp, (auxv_t *)_auxv, _flags, _platform,
241	    _syspagsz, _rt_name, ld_base, interp_base, fd, phdr,
242	    _execname, _argv, uid, euid, gid, egid,
243#ifdef	A_OUT
244	    aoutdyn, auxflags, hwcap)) == NULL) {
245#else
246	    /* CSTYLED */
247	    NULL, auxflags, hwcap)) == NULL) {
248#endif	/* A_OUT */
249		rtldexit(&lml_main, 1);
250	}
251	/* END CSTYLED */
252
253	return (LM_ENTRY_PT(lmp)());
254}
255