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 Elf_Data * 38 elf_newdata(Elf_Scn * s) 39 { 40 Dnode * d; 41 Elf_Data * rc; 42 Elf * elf; 43 unsigned work; 44 45 if (s == 0) 46 return (0); 47 elf = s->s_elf; 48 READLOCKS(elf, s) 49 if (s->s_index == SHN_UNDEF) { 50 _elf_seterr(EREQ_SCNNULL, 0); 51 READUNLOCKS(elf, s) 52 return (0); 53 } 54 55 if ((s->s_myflags & SF_READY) == 0) { 56 UPGRADELOCKS(elf, s) 57 /* 58 * re-confirm that another 'thread' hasn't come along 59 * and cooked this section while the locks were 60 * obtained. 61 */ 62 if ((s->s_myflags & SF_READY) == 0) 63 (void) _elf_cookscn(s); 64 DOWNGRADELOCKS(elf, s) 65 } 66 67 /* 68 * If this is the first new node, use the one allocated 69 * in the scn itself. Update data buffer in both cases. 70 */ 71 ELFACCESSDATA(work, _elf_work) 72 if (s->s_hdnode == 0) { 73 s->s_dnode.db_uflags |= ELF_F_DIRTY; 74 s->s_dnode.db_myflags |= DBF_READY; 75 s->s_hdnode = &s->s_dnode; 76 s->s_tlnode = &s->s_dnode; 77 s->s_dnode.db_scn = s; 78 s->s_dnode.db_data.d_version = work; 79 rc = &s->s_dnode.db_data; 80 READUNLOCKS(elf, s) 81 return (rc); 82 } 83 if ((d = _elf_dnode()) == 0) { 84 READUNLOCKS(elf, s) 85 return (0); 86 } 87 NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*d)) 88 d->db_data.d_version = work; 89 d->db_scn = s; 90 d->db_uflags |= ELF_F_DIRTY; 91 d->db_myflags |= DBF_READY; 92 s->s_tlnode->db_next = d; 93 s->s_tlnode = d; 94 rc = &d->db_data; 95 NOTE(NOW_VISIBLE_TO_OTHER_THREADS(*d)) 96 READUNLOCKS(elf, s) 97 return (rc); 98 } 99