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