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 2006 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 * 26 * Update the symbol table entries: 27 * 28 * o If addr is non-zero then every symbol entry is updated to indicate the 29 * new location to which the object will be mapped. 30 * 31 * o The address of the `_edata' and `_end' symbols, and their associated 32 * section, is updated to reflect any new heap addition. 33 */ 34 35 #include <libelf.h> 36 #include <string.h> 37 #include "sgs.h" 38 #include "machdep.h" 39 #include "msg.h" 40 #include "_librtld.h" 41 42 void 43 update_sym(Cache *cache, Cache *_cache, Addr edata, Half endx, Addr addr) 44 { 45 char *strs; 46 Sym *syms; 47 Shdr *shdr; 48 Xword symn, cnt; 49 50 /* 51 * Set up to read the symbol table and its associated string table. 52 */ 53 shdr = _cache->c_shdr; 54 syms = (Sym *)_cache->c_data->d_buf; 55 symn = shdr->sh_size / shdr->sh_entsize; 56 57 strs = (char *)cache[shdr->sh_link].c_data->d_buf; 58 59 /* 60 * Loop through the symbol table looking for `_end' and `_edata'. 61 */ 62 for (cnt = 0; cnt < symn; cnt++, syms++) { 63 char *name = strs + syms->st_name; 64 65 if (addr) { 66 if (syms->st_value) 67 syms->st_value += addr; 68 } 69 70 if ((name[0] != '_') || (name[1] != 'e')) 71 continue; 72 if (strcmp(name, MSG_ORIG(MSG_SYM_END)) && 73 strcmp(name, MSG_ORIG(MSG_SYM_EDATA))) 74 continue; 75 76 syms->st_value = edata + addr; 77 if (endx) 78 syms->st_shndx = endx; 79 } 80 } 81 82 int 83 syminfo(Cache *_cache, Alist **nodirect) 84 { 85 Syminfo *info; 86 Shdr *shdr; 87 Word num, ndx; 88 89 shdr = _cache->c_shdr; 90 info = (Syminfo *)_cache->c_data->d_buf; 91 num = (Word)(shdr->sh_size / shdr->sh_entsize); 92 93 /* 94 * Traverse the syminfo section recording the index of all nodirect 95 * symbols. 96 */ 97 for (ndx = 1, info++; ndx < num; ndx++, info++) { 98 if ((info->si_flags & SYMINFO_FLG_NOEXTDIRECT) == 0) 99 continue; 100 101 if (alist_append(nodirect, &ndx, sizeof (Word), 20) == 0) 102 return (1); 103 } 104 return (0); 105 } 106