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 #include "libelf.h" 31 #include "decl.h" 32 #include "msg.h" 33 34 35 Elf_Data * 36 elf_newdata(Elf_Scn * s) 37 { 38 Dnode * d; 39 Elf_Data * rc; 40 Elf * elf; 41 unsigned work; 42 43 if (s == 0) 44 return (0); 45 elf = s->s_elf; 46 READLOCKS(elf, s) 47 if (s->s_index == SHN_UNDEF) { 48 _elf_seterr(EREQ_SCNNULL, 0); 49 READUNLOCKS(elf, s) 50 return (0); 51 } 52 53 if ((s->s_myflags & SF_READY) == 0) { 54 UPGRADELOCKS(elf, s) 55 /* 56 * re-confirm that another 'thread' hasn't come along 57 * and cooked this section while the locks were 58 * obtained. 59 */ 60 if ((s->s_myflags & SF_READY) == 0) 61 (void) _elf_cookscn(s); 62 DOWNGRADELOCKS(elf, s) 63 } 64 65 /* 66 * If this is the first new node, use the one allocated 67 * in the scn itself. Update data buffer in both cases. 68 */ 69 ELFACCESSDATA(work, _elf_work) 70 if (s->s_hdnode == 0) { 71 s->s_dnode.db_uflags |= ELF_F_DIRTY; 72 s->s_dnode.db_myflags |= DBF_READY; 73 s->s_hdnode = &s->s_dnode; 74 s->s_tlnode = &s->s_dnode; 75 s->s_dnode.db_scn = s; 76 s->s_dnode.db_data.d_version = work; 77 rc = &s->s_dnode.db_data; 78 READUNLOCKS(elf, s) 79 return (rc); 80 } 81 if ((d = _elf_dnode()) == 0) { 82 READUNLOCKS(elf, s) 83 return (0); 84 } 85 d->db_data.d_version = work; 86 d->db_scn = s; 87 d->db_uflags |= ELF_F_DIRTY; 88 d->db_myflags |= DBF_READY; 89 s->s_tlnode->db_next = d; 90 s->s_tlnode = d; 91 rc = &d->db_data; 92 READUNLOCKS(elf, s) 93 return (rc); 94 } 95