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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  * 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
     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