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      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  * SPARCV9-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 
     54 /* VARARGS */
     55 unsigned long
     56 _setup(Boot *ebp, Dyn *ld_dyn)
     57 {
     58 	ulong_t		reladdr, relacount, ld_base = 0;
     59 	ulong_t		relaent = 0;
     60 	ulong_t		strtab, soname, interp_base = 0;
     61 	char		*_rt_name, **_envp, **_argv;
     62 	int		_syspagsz = 0, fd = -1;
     63 	uint_t		_flags = 0, hwcap_1 = 0;
     64 	Dyn		*dyn_ptr;
     65 	Phdr		*phdr = NULL;
     66 	Rt_map		*lmp;
     67 	auxv_t		*auxv, *_auxv;
     68 	uid_t		uid = (uid_t)-1, euid = (uid_t)-1;
     69 	gid_t		gid = (gid_t)-1, egid = (gid_t)-1;
     70 	char		*_platform = NULL, *_execname = NULL, *_emulator = NULL;
     71 	int		auxflags = -1;
     72 
     73 	/*
     74 	 * Scan the bootstrap structure to pick up the basics.
     75 	 */
     76 	for (; ebp->eb_tag != EB_NULL; ebp++)
     77 		switch (ebp->eb_tag) {
     78 		case EB_LDSO_BASE:
     79 			ld_base = (unsigned long)ebp->eb_un.eb_val;
     80 			break;
     81 		case EB_ARGV:
     82 			_argv = (char **)ebp->eb_un.eb_ptr;
     83 			break;
     84 		case EB_ENVP:
     85 			_envp = (char **)ebp->eb_un.eb_ptr;
     86 			break;
     87 		case EB_AUXV:
     88 			_auxv = (auxv_t *)ebp->eb_un.eb_ptr;
     89 			break;
     90 		case EB_PAGESIZE:
     91 			_syspagsz = (int)ebp->eb_un.eb_val;
     92 			break;
     93 		}
     94 
     95 	/*
     96 	 * Search the aux. vector for the information passed by exec.
     97 	 */
     98 	for (auxv = _auxv; auxv->a_type != AT_NULL; auxv++) {
     99 		switch (auxv->a_type) {
    100 		case AT_EXECFD:
    101 			/* this is the old exec that passes a file descriptor */
    102 			fd = (int)auxv->a_un.a_val;
    103 			break;
    104 		case AT_FLAGS:
    105 			/* processor flags (MAU available, etc) */
    106 			_flags = auxv->a_un.a_val;
    107 			break;
    108 		case AT_PAGESZ:
    109 			/* system page size */
    110 			_syspagsz = (int)auxv->a_un.a_val;
    111 			break;
    112 		case AT_PHDR:
    113 			/* address of the segment table */
    114 			phdr = (Phdr *)auxv->a_un.a_ptr;
    115 			break;
    116 		case AT_BASE:
    117 			/* interpreter base address */
    118 			if (ld_base == 0)
    119 				ld_base = auxv->a_un.a_val;
    120 			interp_base = auxv->a_un.a_val;
    121 			break;
    122 		case AT_SUN_UID:
    123 			/* effective user id for the executable */
    124 			euid = (uid_t)auxv->a_un.a_val;
    125 			break;
    126 		case AT_SUN_RUID:
    127 			/* real user id for the executable */
    128 			uid = (uid_t)auxv->a_un.a_val;
    129 			break;
    130 		case AT_SUN_GID:
    131 			/* effective group id for the executable */
    132 			egid = (gid_t)auxv->a_un.a_val;
    133 			break;
    134 		case AT_SUN_RGID:
    135 			/* real group id for the executable */
    136 			gid = (gid_t)auxv->a_un.a_val;
    137 			break;
    138 		case AT_SUN_PLATFORM:
    139 			/* platform name */
    140 			_platform = auxv->a_un.a_ptr;
    141 			break;
    142 		case AT_SUN_EXECNAME:
    143 			/* full pathname of execed object */
    144 			_execname = auxv->a_un.a_ptr;
    145 			break;
    146 		case AT_SUN_AUXFLAGS:
    147 			/* auxiliary flags */
    148 			auxflags = (int)auxv->a_un.a_val;
    149 			break;
    150 		case AT_SUN_HWCAP:
    151 			/* hardware capabilities */
    152 			hwcap_1 = (uint_t)auxv->a_un.a_val;
    153 			break;
    154 		case AT_SUN_EMULATOR:
    155 			/* name of emulation library, if any */
    156 			_emulator = auxv->a_un.a_ptr;
    157 			break;
    158 		}
    159 	}
    160 
    161 	/*
    162 	 * Get needed info from ld.so's dynamic structure.
    163 	 */
    164 	/* LINTED */
    165 	dyn_ptr = (Dyn *)((char *)ld_dyn + ld_base);
    166 	for (ld_dyn = dyn_ptr; ld_dyn->d_tag != DT_NULL; ld_dyn++) {
    167 		switch (ld_dyn->d_tag) {
    168 		case DT_RELA:
    169 			reladdr = ld_dyn->d_un.d_ptr + ld_base;
    170 			break;
    171 		case DT_RELACOUNT:
    172 			relacount = ld_dyn->d_un.d_val;
    173 			break;
    174 		case DT_RELAENT:
    175 			relaent = ld_dyn->d_un.d_val;
    176 			break;
    177 		case DT_STRTAB:
    178 			strtab = ld_dyn->d_un.d_ptr + ld_base;
    179 			break;
    180 		case DT_SONAME:
    181 			soname = ld_dyn->d_un.d_val;
    182 			break;
    183 		}
    184 	}
    185 	_rt_name = (char *)strtab + soname;
    186 
    187 	/*
    188 	 * If we don't have a RELAENT, just assume the size.
    189 	 */
    190 	if (relaent == 0)
    191 		relaent = sizeof (Rela);
    192 
    193 	/*
    194 	 * As all global symbol references within ld.so.1 are protected
    195 	 * (symbolic), only RELATIVE and JMPSLOT relocations should be left
    196 	 * to process at runtime.  Process all relative relocations now.
    197 	 */
    198 	for (; relacount; relacount--) {
    199 		ulong_t	roffset;
    200 
    201 		roffset = ((Rela *)reladdr)->r_offset + ld_base;
    202 		*((ulong_t *)roffset) = ld_base +
    203 		    ((Rela *)reladdr)->r_addend;
    204 		reladdr += relaent;
    205 	}
    206 
    207 	/*
    208 	 * If an emulation library is being used, use that as the linker's
    209 	 * effective executable name. The real executable is not linked by this
    210 	 * linker.
    211 	 */
    212 	if (_emulator != NULL) {
    213 		_execname = _emulator;
    214 		rtld_flags2 |= RT_FL2_BRANDED;
    215 	}
    216 
    217 	/*
    218 	 * Continue with generic startup processing.
    219 	 */
    220 	if ((lmp = setup((char **)_envp, (auxv_t *)_auxv, _flags, _platform,
    221 	    _syspagsz, _rt_name, ld_base, interp_base, fd, phdr,
    222 	    _execname, _argv, uid, euid, gid, egid, NULL, auxflags,
    223 	    hwcap_1)) == NULL) {
    224 		rtldexit(&lml_main, 1);
    225 	}
    226 
    227 	return (LM_ENTRY_PT(lmp)());
    228 }
    229