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 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* 30 * Object file dependent support for ELF objects. 31 */ 32 33 #include <stdio.h> 34 #include <sys/procfs.h> 35 #include <sys/mman.h> 36 #include <dlfcn.h> 37 #include <debug.h> 38 #include <conv.h> 39 #include "_rtld.h" 40 #include "_audit.h" 41 #include "_elf.h" 42 #include "msg.h" 43 44 /* 45 * For backward compatibility copy relocation processing, it can be necessary to 46 * determine if a copy destination is also the recipient of a move record. For 47 * these instances, the move record addresses are retained for is_move_data(). 48 */ 49 static APlist *alp = NULL; 50 51 /* 52 * Move data 53 */ 54 int 55 move_data(Rt_map *lmp) 56 { 57 Lm_list *lml = LIST(lmp); 58 Move *mv = MOVETAB(lmp); 59 Phdr *pptr = SUNWBSS(lmp); 60 ulong_t num, mvnum = MOVESZ(lmp) / MOVEENT(lmp); 61 int moves; 62 63 /* 64 * If these records are against the executable, and the executable was 65 * built prior to Solaris 8, keep track of the move record symbol. See 66 * comment in analyze.c:lookup_sym_interpose() in regards Solaris 8 67 * objects and DT_FLAGS. 68 */ 69 moves = (lmp == lml->lm_head) && ((FLAGS2(lmp) & FL2_RT_DTFLAGS) == 0); 70 71 DBG_CALL(Dbg_move_data(lmp)); 72 for (num = 0; num < mvnum; num++, mv++) { 73 Addr addr, taddr; 74 Half rep, repno, stride; 75 Sym *sym; 76 77 /* 78 * If the target address needs to be mapped in, 79 * map it first. 80 * (You have to protect the code, thread safe) 81 */ 82 if (FLAGS(lmp) & FLG_RT_SUNWBSS) { 83 long zlen; 84 Off foff; 85 caddr_t zaddr, eaddr; 86 87 foff = (Off) (pptr->p_vaddr + ADDR(lmp)); 88 zaddr = (caddr_t)M_PROUND(foff); 89 eaddr = pptr->p_vaddr + ADDR(lmp) + 90 (caddr_t)pptr->p_memsz; 91 zero((caddr_t)foff, (long)(zaddr - foff)); 92 zlen = eaddr - zaddr; 93 if (zlen > 0) { 94 if (dz_map(lml, zaddr, zlen, 95 (PROT_READ | PROT_WRITE), 96 (MAP_FIXED | MAP_PRIVATE)) == MAP_FAILED) 97 return (0); 98 } 99 100 FLAGS(lmp) &= ~FLG_RT_SUNWBSS; 101 } 102 103 if ((sym = (Sym *)SYMTAB(lmp) + ELF_M_SYM(mv->m_info)) == 0) 104 continue; 105 106 stride = mv->m_stride + 1; 107 addr = sym->st_value; 108 if ((FLAGS(lmp) & FLG_RT_FIXED) == 0) 109 addr += ADDR(lmp); 110 taddr = addr + mv->m_poffset; 111 112 DBG_CALL(Dbg_move_entry2(lml, mv, sym->st_name, 113 (const char *)(sym->st_name + STRTAB(lmp)))); 114 115 for (rep = 0, repno = 0; rep < mv->m_repeat; rep++) { 116 DBG_CALL(Dbg_move_expand(lml, mv, taddr)); 117 118 switch (ELF_M_SIZE(mv->m_info)) { 119 case 1: 120 *((char *)taddr) = (char)mv->m_value; 121 taddr += stride; 122 repno++; 123 break; 124 case 2: 125 /* LINTED */ 126 *((Half *)taddr) = (Half)mv->m_value; 127 taddr += 2 * stride; 128 repno++; 129 break; 130 case 4: 131 /* LINTED */ 132 *((Word *)taddr) = (Word)mv->m_value; 133 taddr += 4 * stride; 134 repno++; 135 break; 136 case 8: 137 /* LINTED */ 138 *((unsigned long long *)taddr) = mv->m_value; 139 taddr += 8 * stride; 140 repno++; 141 break; 142 default: 143 eprintf(lml, ERR_NONE, MSG_INTL(MSG_MOVE_ERR1)); 144 break; 145 } 146 } 147 148 /* 149 * If any move records have been applied to this symbol, retain 150 * the symbol address if required for backward compatibility 151 * copy relocation processing. 152 */ 153 if (moves && repno && 154 (aplist_append(&alp, (void *)addr, AL_CNT_MOVES) == 0)) 155 return (0); 156 } 157 158 /* 159 * Binaries built in the early 1990's prior to Solaris 8, using the ild 160 * incremental linker are known to have zero filled move sections 161 * (presumably place holders for new, incoming move sections). If no 162 * move records have been processed, remove the move identifier to 163 * optimize the amount of backward compatibility copy relocation 164 * processing that is needed. 165 */ 166 if (moves && (alp == NULL)) 167 FLAGS(lmp) &= ~FLG_RT_MOVE; 168 169 return (1); 170 } 171 172 /* 173 * Determine whether an address is the recipient of a move record. 174 * Returns 1 if the address matches a move symbol, 0 otherwise. 175 */ 176 int 177 is_move_data(caddr_t addr) 178 { 179 caddr_t maddr; 180 Aliste idx; 181 182 for (APLIST_TRAVERSE(alp, idx, maddr)) { 183 if (addr == maddr) 184 return (1); 185 } 186 return (0); 187 } 188