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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright (c) 1995-2001 by Sun Microsystems, Inc. 24 * All rights reserved. 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 #pragma ident "%Z%%M% %I% %E% SMI" 35 36 #include <libelf.h> 37 #include <string.h> 38 #include "sgs.h" 39 #include "machdep.h" 40 #include "msg.h" 41 #include "_librtld.h" 42 43 void 44 update_sym(Cache *cache, Cache *_cache, Addr edata, Half endx, Addr addr) 45 { 46 char *strs; 47 Sym *syms; 48 Shdr *shdr; 49 Xword symn, cnt; 50 51 /* 52 * Set up to read the symbol table and its associated string table. 53 */ 54 shdr = _cache->c_shdr; 55 syms = (Sym *)_cache->c_data->d_buf; 56 symn = shdr->sh_size / shdr->sh_entsize; 57 58 strs = (char *)cache[shdr->sh_link].c_data->d_buf; 59 60 /* 61 * Loop through the symbol table looking for `_end' and `_edata'. 62 */ 63 for (cnt = 0; cnt < symn; cnt++, syms++) { 64 char *name = strs + syms->st_name; 65 66 if (addr) { 67 if (syms->st_value) 68 syms->st_value += addr; 69 } 70 71 if ((name[0] != '_') || (name[1] != 'e')) 72 continue; 73 if (strcmp(name, MSG_ORIG(MSG_SYM_END)) && 74 strcmp(name, MSG_ORIG(MSG_SYM_EDATA))) 75 continue; 76 77 syms->st_value = edata + addr; 78 if (endx) 79 syms->st_shndx = endx; 80 } 81 } 82