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 /* Copyright (c) 1988 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #include "libelf.h" 33 #include "decl.h" 34 #include "msg.h" 35 36 37 char * 38 elf_strptr(Elf * elf, size_t ndx, size_t off) 39 { 40 Elf_Scn *s; 41 Elf_Data *d; 42 char *rc; 43 44 if (elf == 0) 45 return (0); 46 if ((s = elf_getscn(elf, ndx)) == 0) { 47 _elf_seterr(EREQ_STRSCN, 0); 48 return (0); 49 } 50 READLOCKS(elf, s) 51 if (elf->ed_class == ELFCLASS32) { 52 Elf32_Shdr* sh = (Elf32_Shdr*)s->s_shdr; 53 54 if ((sh == 0) || (sh->sh_type != SHT_STRTAB)) { 55 _elf_seterr(EREQ_STRSCN, 0); 56 READUNLOCKS(elf, s) 57 return (0); 58 } 59 } else if (elf->ed_class == ELFCLASS64) { 60 Elf64_Shdr* sh = (Elf64_Shdr*)s->s_shdr; 61 62 if ((sh == 0) || (sh->sh_type != SHT_STRTAB)) { 63 _elf_seterr(EREQ_STRSCN, 0); 64 READUNLOCKS(elf, s) 65 return (0); 66 } 67 } else { 68 _elf_seterr(EREQ_STRSCN, 0); 69 READUNLOCKS(elf, s) 70 return (0); 71 } 72 73 74 /* 75 * If the layout bit is set, use the offsets and 76 * sizes in the data buffers. Otherwise, take 77 * data buffers in order. 78 */ 79 80 d = 0; 81 if (elf->ed_uflags & ELF_F_LAYOUT) { 82 while ((d = _elf_locked_getdata(s, d)) != 0) { 83 if (d->d_buf == 0) 84 continue; 85 if ((off >= d->d_off) && 86 (off < d->d_off + d->d_size)) { 87 rc = (char *)d->d_buf + off - d->d_off; 88 READUNLOCKS(elf, s) 89 return (rc); 90 } 91 } 92 } else { 93 size_t sz = 0, j; 94 while ((d = _elf_locked_getdata(s, d)) != 0) { 95 if (((j = d->d_align) > 1) && (sz % j != 0)) { 96 j -= sz % j; 97 sz += j; 98 if (off < j) 99 break; 100 off -= j; 101 } 102 if (d->d_buf != 0) { 103 if (off < d->d_size) { 104 rc = (char *)d->d_buf + off; 105 READUNLOCKS(elf, s) 106 return (rc); 107 } 108 } 109 sz += d->d_size; 110 if (off < d->d_size) 111 break; 112 off -= d->d_size; 113 } 114 } 115 _elf_seterr(EREQ_STROFF, 0); 116 READUNLOCKS(elf, s) 117 return (0); 118 } 119